/*
* tclNamesp.c --
*
* Contains support for namespaces, which provide a separate context of
* commands and global variables. The global :: namespace is the
* traditional Tcl "global" scope. Other namespaces are created as
* children of the global namespace. These other namespaces contain
* special-purpose commands and variables for packages. Also includes the
* TIP#112 ensemble machinery.
*
* Copyright (c) 1993-1997 Lucent Technologies.
* Copyright (c) 1997 Sun Microsystems, Inc.
* Copyright (c) 1998-1999 by Scriptics Corporation.
* Copyright (c) 2002-2005 Donal K. Fellows.
* Copyright (c) 2006 Neil Madden.
* Contributions from Don Porter, NIST, 2007. (not subject to US copyright)
*
* Originally implemented by
* Michael J. McLennan
* Bell Labs Innovations for Lucent Technologies
* [email protected]
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclNamesp.c,v 1.162.2.4 2009/01/29 16:08:39 dkf Exp $
*/
#include "tclInt.h"
/*
* Thread-local storage used to avoid having a global lock on data that is not
* limited to a single interpreter.
*/
typedef struct ThreadSpecificData {
long numNsCreated; /* Count of the number of namespaces created
* within the thread. This value is used as a
* unique id for each namespace. Cannot be
* per-interp because the nsId is used to
* distinguish objects which can be passed
* around between interps in the same thread,
* but does not need to be global because
* object internal reps are always per-thread
* anyway. */
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;
/*
* This structure contains a cached pointer to a namespace that is the result
* of resolving the namespace's name in some other namespace. It is the
* internal representation for a nsName object. It contains the pointer along
* with some information that is used to check the cached pointer's validity.
*/
typedef struct ResolvedNsName {
Namespace *nsPtr; /* A cached pointer to the Namespace that the
* name resolved to. */
Namespace *refNsPtr; /* Points to the namespace context in which the
* name was resolved. NULL if the name is fully
* qualified and thus the resolution does not
* depend on the context. */
int refCount; /* Reference count: 1 for each nsName object
* that has a pointer to this ResolvedNsName
* structure as its internal rep. This
* structure can be freed when refCount
* becomes zero. */
} ResolvedNsName;
/*
* The client data for an ensemble command. This consists of the table of
* commands that are actually exported by the namespace, and an epoch counter
* that, combined with the exportLookupEpoch field of the namespace structure,
* defines whether the table contains valid data or will need to be recomputed
* next time the ensemble command is called.
*/
typedef struct EnsembleConfig {
Namespace *nsPtr; /* The namspace backing this ensemble up. */
Tcl_Command token; /* The token for the command that provides
* ensemble support for the namespace, or NULL
* if the command has been deleted (or never
* existed; the global namespace never has an
* ensemble command.) */
int epoch; /* The epoch at which this ensemble's table of
* exported commands is valid. */
char **subcommandArrayPtr; /* Array of ensemble subcommand names. At all
* consistent points, this will have the same
* number of entries as there are entries in
* the subcommandTable hash. */
Tcl_HashTable subcommandTable;
/* Hash table of ensemble subcommand names,
* which are its keys so this also provides
* the storage management for those subcommand
* names. The contents of the entry values are
* object version the prefix lists to use when
* substituting for the command/subcommand to
* build the ensemble implementation command.
* Has to be stored here as well as in
* subcommandDict because that field is NULL
* when we are deriving the ensemble from the
* namespace exports list. FUTURE WORK: use
* object hash table here. */
struct EnsembleConfig *next;/* The next ensemble in the linked list of
* ensembles associated with a namespace. If
* this field points to this ensemble, the
* structure has already been unlinked from
* all lists, and cannot be found by scanning
* the list from the namespace's ensemble
* field. */
int flags; /* ORed combo of TCL_ENSEMBLE_PREFIX, ENS_DEAD
* and ENSEMBLE_COMPILE. */
/* OBJECT FIELDS FOR ENSEMBLE CONFIGURATION */
Tcl_Obj *subcommandDict; /* Dictionary providing mapping from
* subcommands to their implementing command
* prefixes, or NULL if we are to build the
* map automatically from the namespace
* exports. */
Tcl_Obj *subcmdList; /* List of commands that this ensemble
* actually provides, and whose implementation
* will be built using the subcommandDict (if
* present and defined) and by simple mapping
* to the namespace otherwise. If NULL,
* indicates that we are using the (dynamic)
* list of currently exported commands. */
Tcl_Obj *unknownHandler; /* Script prefix used to handle the case when
* no match is found (according to the rule
* defined by flag bit TCL_ENSEMBLE_PREFIX) or
* NULL to use the default error-generating
* behaviour. The script execution gets all
* the arguments to the ensemble command
* (including objv[0]) and will have the
* results passed directly back to the caller
* (including the error code) unless the code
* is TCL_CONTINUE in which case the
* subcommand will be reparsed by the ensemble
* core, presumably because the ensemble
* itself has been updated. */
} EnsembleConfig;
#define ENS_DEAD 0x1 /* Flag value to say that the ensemble is dead
* and on its way out. */
/*
* Declarations for functions local to this file:
*/
static void DeleteImportedCmd(ClientData clientData);
static int DoImport(Tcl_Interp *interp,
Namespace *nsPtr, Tcl_HashEntry *hPtr,
const char *cmdName, const char *pattern,
Namespace *importNsPtr, int allowOverwrite);
static void DupNsNameInternalRep(Tcl_Obj *objPtr,Tcl_Obj *copyPtr);
static char * ErrorCodeRead(ClientData clientData,Tcl_Interp *interp,
const char *name1, const char *name2, int flags);
static char * ErrorInfoRead(ClientData clientData,Tcl_Interp *interp,
const char *name1, const char *name2, int flags);
static char * EstablishErrorCodeTraces(ClientData clientData,
Tcl_Interp *interp, const char *name1,
const char *name2, int flags);
static char * EstablishErrorInfoTraces(ClientData clientData,
Tcl_Interp *interp, const char *name1,
const char *name2, int flags);
static void FreeNsNameInternalRep(Tcl_Obj *objPtr);
static int GetNamespaceFromObj(Tcl_Interp *interp,
Tcl_Obj *objPtr, Tcl_Namespace **nsPtrPtr);
static int InvokeImportedCmd(ClientData clientData,
Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]);
static int NamespaceChildrenCmd(ClientData dummy,
Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]);
static int NamespaceCodeCmd(ClientData dummy, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int NamespaceCurrentCmd(ClientData dummy,
Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]);
static int NamespaceDeleteCmd(ClientData dummy,Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int NamespaceEnsembleCmd(ClientData dummy,
Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]);
static int NamespaceEvalCmd(ClientData dummy, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int NamespaceExistsCmd(ClientData dummy,Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int NamespaceExportCmd(ClientData dummy,Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int NamespaceForgetCmd(ClientData dummy,Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static void NamespaceFree(Namespace *nsPtr);
static int NamespaceImportCmd(ClientData dummy,Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int NamespaceInscopeCmd(ClientData dummy,
Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]);
static int NamespaceOriginCmd(ClientData dummy,Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int NamespaceParentCmd(ClientData dummy,Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int NamespacePathCmd(ClientData dummy, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int NamespaceQualifiersCmd(ClientData dummy,
Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]);
static int NamespaceTailCmd(ClientData dummy, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int NamespaceUpvarCmd(ClientData dummy, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int NamespaceUnknownCmd(ClientData dummy,
Tcl_Interp *interp, int objc,
Tcl_Obj *const objv[]);
static int NamespaceWhichCmd(ClientData dummy, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int SetNsNameFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);
static int NsEnsembleImplementationCmd(ClientData clientData,
Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]);
static void BuildEnsembleConfig(EnsembleConfig *ensemblePtr);
static int NsEnsembleStringOrder(const void *strPtr1,
const void *strPtr2);
static void DeleteEnsembleConfig(ClientData clientData);
static void MakeCachedEnsembleCommand(Tcl_Obj *objPtr,
EnsembleConfig *ensemblePtr,
const char *subcmdName, Tcl_Obj *prefixObjPtr);
static void FreeEnsembleCmdRep(Tcl_Obj *objPtr);
static void DupEnsembleCmdRep(Tcl_Obj *objPtr, Tcl_Obj *copyPtr);
static void StringOfEnsembleCmdRep(Tcl_Obj *objPtr);
static void UnlinkNsPath(Namespace *nsPtr);
/*
* This structure defines a Tcl object type that contains a namespace
* reference. It is used in commands that take the name of a namespace as an
* argument. The namespace reference is resolved, and the result in cached in
* the object.
*/
static Tcl_ObjType nsNameType = {
"nsName", /* the type's name */
FreeNsNameInternalRep, /* freeIntRepProc */
DupNsNameInternalRep, /* dupIntRepProc */
NULL, /* updateStringProc */
SetNsNameFromAny /* setFromAnyProc */
};
/*
* This structure defines a Tcl object type that contains a reference to an
* ensemble subcommand (e.g. the "length" in [string length ab]). It is used
* to cache the mapping between the subcommand itself and the real command
* that implements it.
*/
Tcl_ObjType tclEnsembleCmdType = {
"ensembleCommand", /* the type's name */
FreeEnsembleCmdRep, /* freeIntRepProc */
DupEnsembleCmdRep, /* dupIntRepProc */
StringOfEnsembleCmdRep, /* updateStringProc */
NULL /* setFromAnyProc */
};
/*
*----------------------------------------------------------------------
*
* TclInitNamespaceSubsystem --
*
* This function is called to initialize all the structures that are used
* by namespaces on a per-process basis.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TclInitNamespaceSubsystem(void)
{
/*
* Does nothing for now.
*/
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetCurrentNamespace --
*
* Returns a pointer to an interpreter's currently active namespace.
*
* Results:
* Returns a pointer to the interpreter's current namespace.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_Namespace *
Tcl_GetCurrentNamespace(
register Tcl_Interp *interp)/* Interpreter whose current namespace is
* being queried. */
{
return TclGetCurrentNamespace(interp);
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetGlobalNamespace --
*
* Returns a pointer to an interpreter's global :: namespace.
*
* Results:
* Returns a pointer to the specified interpreter's global namespace.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_Namespace *
Tcl_GetGlobalNamespace(
register Tcl_Interp *interp)/* Interpreter whose global namespace should
* be returned. */
{
return TclGetGlobalNamespace(interp);
}
/*
*----------------------------------------------------------------------
*
* Tcl_PushCallFrame --
*
* Pushes a new call frame onto the interpreter's Tcl call stack. Called
* when executing a Tcl procedure or a "namespace eval" or "namespace
* inscope" command.
*
* Results:
* Returns TCL_OK if successful, or TCL_ERROR (along with an error
* message in the interpreter's result object) if something goes wrong.
*
* Side effects:
* Modifies the interpreter's Tcl call stack.
*
*----------------------------------------------------------------------
*/
int
Tcl_PushCallFrame(
Tcl_Interp *interp, /* Interpreter in which the new call frame is
* to be pushed. */
Tcl_CallFrame *callFramePtr,/* Points to a call frame structure to push.
* Storage for this has already been allocated
* by the caller; typically this is the
* address of a CallFrame structure allocated
* on the caller's C stack. The call frame
* will be initialized by this function. The
* caller can pop the frame later with
* Tcl_PopCallFrame, and it is responsible for
* freeing the frame's storage. */
Tcl_Namespace *namespacePtr,/* Points to the namespace in which the frame
* will execute. If NULL, the interpreter's
* current namespace will be used. */
int isProcCallFrame) /* If nonzero, the frame represents a called
* Tcl procedure and may have local vars. Vars
* will ordinarily be looked up in the frame.
* If new variables are created, they will be
* created in the frame. If 0, the frame is
* for a "namespace eval" or "namespace
* inscope" command and var references are
* treated as references to namespace
* variables. */
{
Interp *iPtr = (Interp *) interp;
register CallFrame *framePtr = (CallFrame *) callFramePtr;
register Namespace *nsPtr;
if (namespacePtr == NULL) {
nsPtr = (Namespace *) TclGetCurrentNamespace(interp);
} else {
nsPtr = (Namespace *) namespacePtr;
/*
* TODO: Examine whether it would be better to guard based on NS_DYING
* or NS_KILLED. It appears that these are not tested because they can
* be set in a global interp that has been [namespace delete]d, but
* which never really completely goes away because of lingering global
* things like ::errorInfo and [::unknown] and hidden commands.
* Review of those designs might permit stricter checking here.
*/
if (nsPtr->flags & NS_DEAD) {
Tcl_Panic("Trying to push call frame for dead namespace");
/*NOTREACHED*/
}
}
nsPtr->activationCount++;
framePtr->nsPtr = nsPtr;
framePtr->isProcCallFrame = isProcCallFrame;
framePtr->objc = 0;
framePtr->objv = NULL;
framePtr->callerPtr = iPtr->framePtr;
framePtr->callerVarPtr = iPtr->varFramePtr;
if (iPtr->varFramePtr != NULL) {
framePtr->level = (iPtr->varFramePtr->level + 1);
} else {
framePtr->level = 0;
}
framePtr->procPtr = NULL; /* no called procedure */
framePtr->varTablePtr = NULL; /* and no local variables */
framePtr->numCompiledLocals = 0;
framePtr->compiledLocals = NULL;
framePtr->clientData = NULL;
framePtr->localCachePtr = NULL;
/*
* Push the new call frame onto the interpreter's stack of procedure call
* frames making it the current frame.
*/
iPtr->framePtr = framePtr;
iPtr->varFramePtr = framePtr;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_PopCallFrame --
*
* Removes a call frame from the Tcl call stack for the interpreter.
* Called to remove a frame previously pushed by Tcl_PushCallFrame.
*
* Results:
* None.
*
* Side effects:
* Modifies the call stack of the interpreter. Resets various fields of
* the popped call frame. If a namespace has been deleted and has no more
* activations on the call stack, the namespace is destroyed.
*
*----------------------------------------------------------------------
*/
void
Tcl_PopCallFrame(
Tcl_Interp *interp) /* Interpreter with call frame to pop. */
{
register Interp *iPtr = (Interp *) interp;
register CallFrame *framePtr = iPtr->framePtr;
Namespace *nsPtr;
/*
* It's important to remove the call frame from the interpreter's stack of
* call frames before deleting local variables, so that traces invoked by
* the variable deletion don't see the partially-deleted frame.
*/
if (framePtr->callerPtr) {
iPtr->framePtr = framePtr->callerPtr;
iPtr->varFramePtr = framePtr->callerVarPtr;
} else {
/* Tcl_PopCallFrame: trying to pop rootCallFrame! */
}
if (framePtr->varTablePtr != NULL) {
TclDeleteVars(iPtr, framePtr->varTablePtr);
ckfree((char *) framePtr->varTablePtr);
framePtr->varTablePtr = NULL;
}
if (framePtr->numCompiledLocals > 0) {
TclDeleteCompiledLocalVars(iPtr, framePtr);
if (--framePtr->localCachePtr->refCount == 0) {
TclFreeLocalCache(interp, framePtr->localCachePtr);
}
framePtr->localCachePtr = NULL;
}
/*
* Decrement the namespace's count of active call frames. If the namespace
* is "dying" and there are no more active call frames, call
* Tcl_DeleteNamespace to destroy it.
*/
nsPtr = framePtr->nsPtr;
nsPtr->activationCount--;
if ((nsPtr->flags & NS_DYING)
&& (nsPtr->activationCount - (nsPtr == iPtr->globalNsPtr) == 0)) {
Tcl_DeleteNamespace((Tcl_Namespace *) nsPtr);
}
framePtr->nsPtr = NULL;
}
/*
*----------------------------------------------------------------------
*
* TclPushStackFrame --
*
* Allocates a new call frame in the interpreter's execution stack, then
* pushes it onto the interpreter's Tcl call stack. Called when executing
* a Tcl procedure or a "namespace eval" or "namespace inscope" command.
*
* Results:
* Returns TCL_OK if successful, or TCL_ERROR (along with an error
* message in the interpreter's result object) if something goes wrong.
*
* Side effects:
* Modifies the interpreter's Tcl call stack.
*
*----------------------------------------------------------------------
*/
int
TclPushStackFrame(
Tcl_Interp *interp, /* Interpreter in which the new call frame is
* to be pushed. */
Tcl_CallFrame **framePtrPtr,/* Place to store a pointer to the stack
* allocated call frame. */
Tcl_Namespace *namespacePtr,/* Points to the namespace in which the frame
* will execute. If NULL, the interpreter's
* current namespace will be used. */
int isProcCallFrame) /* If nonzero, the frame represents a called
* Tcl procedure and may have local vars. Vars
* will ordinarily be looked up in the frame.
* If new variables are created, they will be
* created in the frame. If 0, the frame is
* for a "namespace eval" or "namespace
* inscope" command and var references are
* treated as references to namespace
* variables. */
{
*framePtrPtr = (Tcl_CallFrame *) TclStackAlloc(interp, sizeof(CallFrame));
return Tcl_PushCallFrame(interp, *framePtrPtr, namespacePtr,
isProcCallFrame);
}
void
TclPopStackFrame(
Tcl_Interp *interp) /* Interpreter with call frame to pop. */
{
CallFrame *freePtr = ((Interp *)interp)->framePtr;
Tcl_PopCallFrame(interp);
TclStackFree(interp, freePtr);
}
/*
*----------------------------------------------------------------------
*
* EstablishErrorCodeTraces --
*
* Creates traces on the ::errorCode variable to keep its value
* consistent with the expectations of legacy code.
*
* Results:
* None.
*
* Side effects:
* Read and unset traces are established on ::errorCode.
*
*----------------------------------------------------------------------
*/
static char *
EstablishErrorCodeTraces(
ClientData clientData,
Tcl_Interp *interp,
const char *name1,
const char *name2,
int flags)
{
Tcl_TraceVar(interp, "errorCode", TCL_GLOBAL_ONLY | TCL_TRACE_READS,
ErrorCodeRead, NULL);
Tcl_TraceVar(interp, "errorCode", TCL_GLOBAL_ONLY | TCL_TRACE_UNSETS,
EstablishErrorCodeTraces, NULL);
return NULL;
}
/*
*----------------------------------------------------------------------
*
* ErrorCodeRead --
*
* Called when the ::errorCode variable is read. Copies the current value
* of the interp's errorCode field into ::errorCode.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static char *
ErrorCodeRead(
ClientData clientData,
Tcl_Interp *interp,
const char *name1,
const char *name2,
int flags)
{
Interp *iPtr = (Interp *)interp;
if (Tcl_InterpDeleted(interp) || !(iPtr->flags & ERR_LEGACY_COPY)) {
return NULL;
}
if (iPtr->errorCode) {
Tcl_ObjSetVar2(interp, iPtr->ecVar, NULL,
iPtr->errorCode, TCL_GLOBAL_ONLY);
return NULL;
}
if (NULL == Tcl_ObjGetVar2(interp, iPtr->ecVar, NULL, TCL_GLOBAL_ONLY)) {
Tcl_ObjSetVar2(interp, iPtr->ecVar, NULL,
Tcl_NewObj(), TCL_GLOBAL_ONLY);
}
return NULL;
}
/*
*----------------------------------------------------------------------
*
* EstablishErrorInfoTraces --
*
* Creates traces on the ::errorInfo variable to keep its value
* consistent with the expectations of legacy code.
*
* Results:
* None.
*
* Side effects:
* Read and unset traces are established on ::errorInfo.
*
*----------------------------------------------------------------------
*/
static char *
EstablishErrorInfoTraces(
ClientData clientData,
Tcl_Interp *interp,
const char *name1,
const char *name2,
int flags)
{
Tcl_TraceVar(interp, "errorInfo", TCL_GLOBAL_ONLY | TCL_TRACE_READS,
ErrorInfoRead, NULL);
Tcl_TraceVar(interp, "errorInfo", TCL_GLOBAL_ONLY | TCL_TRACE_UNSETS,
EstablishErrorInfoTraces, NULL);
return NULL;
}
/*
*----------------------------------------------------------------------
*
* ErrorInfoRead --
*
* Called when the ::errorInfo variable is read. Copies the current value
* of the interp's errorInfo field into ::errorInfo.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static char *
ErrorInfoRead(
ClientData clientData,
Tcl_Interp *interp,
const char *name1,
const char *name2,
int flags)
{
Interp *iPtr = (Interp *) interp;
if (Tcl_InterpDeleted(interp) || !(iPtr->flags & ERR_LEGACY_COPY)) {
return NULL;
}
if (iPtr->errorInfo) {
Tcl_ObjSetVar2(interp, iPtr->eiVar, NULL,
iPtr->errorInfo, TCL_GLOBAL_ONLY);
return NULL;
}
if (NULL == Tcl_ObjGetVar2(interp, iPtr->eiVar, NULL, TCL_GLOBAL_ONLY)) {
Tcl_ObjSetVar2(interp, iPtr->eiVar, NULL,
Tcl_NewObj(), TCL_GLOBAL_ONLY);
}
return NULL;
}
/*
*----------------------------------------------------------------------
*
* Tcl_CreateNamespace --
*
* Creates a new namespace with the given name. If there is no active
* namespace (i.e., the interpreter is being initialized), the global ::
* namespace is created and returned.
*
* Results:
* Returns a pointer to the new namespace if successful. If the namespace
* already exists or if another error occurs, this routine returns NULL,
* along with an error message in the interpreter's result object.
*
* Side effects:
* If the name contains "::" qualifiers and a parent namespace does not
* already exist, it is automatically created.
*
*----------------------------------------------------------------------
*/
Tcl_Namespace *
Tcl_CreateNamespace(
Tcl_Interp *interp, /* Interpreter in which a new namespace is
* being created. Also used for error
* reporting. */
const char *name, /* Name for the new namespace. May be a
* qualified name with names of ancestor
* namespaces separated by "::"s. */
ClientData clientData, /* One-word value to store with namespace. */
Tcl_NamespaceDeleteProc *deleteProc)
/* Function called to delete client data when
* the namespace is deleted. NULL if no
* function should be called. */
{
Interp *iPtr = (Interp *) interp;
register Namespace *nsPtr, *ancestorPtr;
Namespace *parentPtr, *dummy1Ptr, *dummy2Ptr;
Namespace *globalNsPtr = iPtr->globalNsPtr;
const char *simpleName;
Tcl_HashEntry *entryPtr;
Tcl_DString buffer1, buffer2;
Tcl_DString *namePtr, *buffPtr;
int newEntry, nameLen;
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
/*
* If there is no active namespace, the interpreter is being initialized.
*/
if ((globalNsPtr == NULL) && (iPtr->varFramePtr == NULL)) {
/*
* Treat this namespace as the global namespace, and avoid looking for
* a parent.
*/
parentPtr = NULL;
simpleName = "";
} else if (*name == '\0') {
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "can't create namespace \"\": "
"only global namespace can have empty name", NULL);
return NULL;
} else {
/*
* Find the parent for the new namespace.
*/
TclGetNamespaceForQualName(interp, name, NULL,
/*flags*/ (TCL_CREATE_NS_IF_UNKNOWN | TCL_LEAVE_ERR_MSG),
&parentPtr, &dummy1Ptr, &dummy2Ptr, &simpleName);
/*
* If the unqualified name at the end is empty, there were trailing
* "::"s after the namespace's name which we ignore. The new namespace
* was already (recursively) created and is pointed to by parentPtr.
*/
if (*simpleName == '\0') {
return (Tcl_Namespace *) parentPtr;
}
/*
* Check for a bad namespace name and make sure that the name does not
* already exist in the parent namespace.
*/
if (Tcl_FindHashEntry(&parentPtr->childTable, simpleName) != NULL) {
Tcl_AppendResult(interp, "can't create namespace \"", name,
"\": already exists", NULL);
return NULL;
}
}
/*
* Create the new namespace and root it in its parent. Increment the count
* of namespaces created.
*/
nsPtr = (Namespace *) ckalloc(sizeof(Namespace));
nsPtr->name = ckalloc((unsigned) (strlen(simpleName)+1));
strcpy(nsPtr->name, simpleName);
nsPtr->fullName = NULL; /* Set below. */
nsPtr->clientData = clientData;
nsPtr->deleteProc = deleteProc;
nsPtr->parentPtr = parentPtr;
Tcl_InitHashTable(&nsPtr->childTable, TCL_STRING_KEYS);
nsPtr->nsId = ++(tsdPtr->numNsCreated);
nsPtr->interp = interp;
nsPtr->flags = 0;
nsPtr->activationCount = 0;
nsPtr->refCount = 0;
Tcl_InitHashTable(&nsPtr->cmdTable, TCL_STRING_KEYS);
TclInitVarHashTable(&nsPtr->varTable, nsPtr);
nsPtr->exportArrayPtr = NULL;
nsPtr->numExportPatterns = 0;
nsPtr->maxExportPatterns = 0;
nsPtr->cmdRefEpoch = 0;
nsPtr->resolverEpoch = 0;
nsPtr->cmdResProc = NULL;
nsPtr->varResProc = NULL;
nsPtr->compiledVarResProc = NULL;
nsPtr->exportLookupEpoch = 0;
nsPtr->ensembles = NULL;
nsPtr->unknownHandlerPtr = NULL;
nsPtr->commandPathLength = 0;
nsPtr->commandPathArray = NULL;
nsPtr->commandPathSourceList = NULL;
if (parentPtr != NULL) {
entryPtr = Tcl_CreateHashEntry(&parentPtr->childTable, simpleName,
&newEntry);
Tcl_SetHashValue(entryPtr, nsPtr);
} else {
/*
* In the global namespace create traces to maintain the ::errorInfo
* and ::errorCode variables.
*/
iPtr->globalNsPtr = nsPtr;
EstablishErrorInfoTraces(NULL, interp, NULL, NULL, 0);
EstablishErrorCodeTraces(NULL, interp, NULL, NULL, 0);
}
/*
* Build the fully qualified name for this namespace.
*/
Tcl_DStringInit(&buffer1);
Tcl_DStringInit(&buffer2);
namePtr = &buffer1;
buffPtr = &buffer2;
for (ancestorPtr = nsPtr; ancestorPtr != NULL;
ancestorPtr = ancestorPtr->parentPtr) {
if (ancestorPtr != globalNsPtr) {
register Tcl_DString *tempPtr = namePtr;
Tcl_DStringAppend(buffPtr, "::", 2);
Tcl_DStringAppend(buffPtr, ancestorPtr->name, -1);
Tcl_DStringAppend(buffPtr, Tcl_DStringValue(namePtr),
Tcl_DStringLength(namePtr));
/*
* Clear the unwanted buffer or we end up appending to previous
* results, making the namespace fullNames of nested namespaces
* very wrong (and strange).
*/
Tcl_DStringSetLength(namePtr, 0);
/*
* Now swap the buffer pointers so that we build in the other
* buffer. This is faster than repeated copying back and forth
* between buffers.
*/
namePtr = buffPtr;
buffPtr = tempPtr;
}
}
name = Tcl_DStringValue(namePtr);
nameLen = Tcl_DStringLength(namePtr);
nsPtr->fullName = ckalloc((unsigned) (nameLen+1));
memcpy(nsPtr->fullName, name, (unsigned) nameLen + 1);
Tcl_DStringFree(&buffer1);
Tcl_DStringFree(&buffer2);
/*
* Return a pointer to the new namespace.
*/
return (Tcl_Namespace *) nsPtr;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DeleteNamespace --
*
* Deletes a namespace and all of the commands, variables, and other
* namespaces within it.
*
* Results:
* None.
*
* Side effects:
* When a namespace is deleted, it is automatically removed as a child of
* its parent namespace. Also, all its commands, variables and child
* namespaces are deleted.
*
*----------------------------------------------------------------------
*/
void
Tcl_DeleteNamespace(
Tcl_Namespace *namespacePtr)/* Points to the namespace to delete. */
{
register Namespace *nsPtr = (Namespace *) namespacePtr;
Interp *iPtr = (Interp *) nsPtr->interp;
Namespace *globalNsPtr = (Namespace *)
TclGetGlobalNamespace((Tcl_Interp *) iPtr);
Tcl_HashEntry *entryPtr;
/*
* If the namespace has associated ensemble commands, delete them first.
* This leaves the actual contents of the namespace alone (unless they are
* linked ensemble commands, of course). Note that this code is actually
* reentrant so command delete traces won't purturb things badly.
*/
while (nsPtr->ensembles != NULL) {
EnsembleConfig *ensemblePtr = (EnsembleConfig *) nsPtr->ensembles;
/*
* Splice out and link to indicate that we've already been killed.
*/
nsPtr->ensembles = (Tcl_Ensemble *) ensemblePtr->next;
ensemblePtr->next = ensemblePtr;
Tcl_DeleteCommandFromToken(nsPtr->interp, ensemblePtr->token);
}
/*
* If the namespace has a registered unknown handler (TIP 181), then free
* it here.
*/
if (nsPtr->unknownHandlerPtr != NULL) {
Tcl_DecrRefCount(nsPtr->unknownHandlerPtr);
nsPtr->unknownHandlerPtr = NULL;
}
/*
* If the namespace is on the call frame stack, it is marked as "dying"
* (NS_DYING is OR'd into its flags): the namespace can't be looked up by
* name but its commands and variables are still usable by those active
* call frames. When all active call frames referring to the namespace
* have been popped from the Tcl stack, Tcl_PopCallFrame will call this
* function again to delete everything in the namespace. If no nsName
* objects refer to the namespace (i.e., if its refCount is zero), its
* commands and variables are deleted and the storage for its namespace
* structure is freed. Otherwise, if its refCount is nonzero, the
* namespace's commands and variables are deleted but the structure isn't
* freed. Instead, NS_DEAD is OR'd into the structure's flags to allow the
* namespace resolution code to recognize that the namespace is "deleted".
* The structure's storage is freed by FreeNsNameInternalRep when its
* refCount reaches 0.
*/
if (nsPtr->activationCount - (nsPtr == globalNsPtr) > 0) {
nsPtr->flags |= NS_DYING;
if (nsPtr->parentPtr != NULL) {
entryPtr = Tcl_FindHashEntry(&nsPtr->parentPtr->childTable,
nsPtr->name);
if (entryPtr != NULL) {
Tcl_DeleteHashEntry(entryPtr);
}
}
nsPtr->parentPtr = NULL;
} else if (!(nsPtr->flags & NS_KILLED)) {
/*
* Delete the namespace and everything in it. If this is the global
* namespace, then clear it but don't free its storage unless the
* interpreter is being torn down. Set the NS_KILLED flag to avoid
* recursive calls here - if the namespace is really in the process of
* being deleted, ignore any second call.
*/
nsPtr->flags |= (NS_DYING|NS_KILLED);
TclTeardownNamespace(nsPtr);
if ((nsPtr != globalNsPtr) || (iPtr->flags & DELETED)) {
/*
* If this is the global namespace, then it may have residual
* "errorInfo" and "errorCode" variables for errors that occurred
* while it was being torn down. Try to clear the variable list
* one last time.
*/
TclDeleteNamespaceVars(nsPtr);
Tcl_DeleteHashTable(&nsPtr->childTable);
Tcl_DeleteHashTable(&nsPtr->cmdTable);
/*
* If the reference count is 0, then discard the namespace.
* Otherwise, mark it as "dead" so that it can't be used.
*/
if (nsPtr->refCount == 0) {
NamespaceFree(nsPtr);
} else {
nsPtr->flags |= NS_DEAD;
}
} else {
/*
* Restore the ::errorInfo and ::errorCode traces.
*/
EstablishErrorInfoTraces(NULL, nsPtr->interp, NULL, NULL, 0);
EstablishErrorCodeTraces(NULL, nsPtr->interp, NULL, NULL, 0);
/*
* We didn't really kill it, so remove the KILLED marks, so it can
* get killed later, avoiding mem leaks.
*/
nsPtr->flags &= ~(NS_DYING|NS_KILLED);
}
}
}
/*
*----------------------------------------------------------------------
*
* TclTeardownNamespace --
*
* Used internally to dismantle and unlink a namespace when it is
* deleted. Divorces the namespace from its parent, and deletes all
* commands, variables, and child namespaces.
*
* This is kept separate from Tcl_DeleteNamespace so that the global
* namespace can be handled specially.
*
* Results:
* None.
*
* Side effects:
* Removes this namespace from its parent's child namespace hashtable.
* Deletes all commands, variables and namespaces in this namespace.
*
*----------------------------------------------------------------------
*/
void
TclTeardownNamespace(
register Namespace *nsPtr) /* Points to the namespace to be dismantled
* and unlinked from its parent. */
{
Interp *iPtr = (Interp *) nsPtr->interp;
register Tcl_HashEntry *entryPtr;
Tcl_HashSearch search;
Tcl_Namespace *childNsPtr;
Tcl_Command cmd;
int i;
/*
* Start by destroying the namespace's variable table, since variables
* might trigger traces. Variable table should be cleared but not freed!
* TclDeleteNamespaceVars frees it, so we reinitialize it afterwards.
*/
TclDeleteNamespaceVars(nsPtr);
TclInitVarHashTable(&nsPtr->varTable, nsPtr);
/*
* Delete all commands in this namespace. Be careful when traversing the
* hash table: when each command is deleted, it removes itself from the
* command table.
*
* Don't optimize to Tcl_NextHashEntry() because of traces.
*/
for (entryPtr = Tcl_FirstHashEntry(&nsPtr->cmdTable, &search);
entryPtr != NULL;
entryPtr = Tcl_FirstHashEntry(&nsPtr->cmdTable, &search)) {
cmd = Tcl_GetHashValue(entryPtr);
Tcl_DeleteCommandFromToken((Tcl_Interp *) iPtr, cmd);
}
Tcl_DeleteHashTable(&nsPtr->cmdTable);
Tcl_InitHashTable(&nsPtr->cmdTable, TCL_STRING_KEYS);
/*
* Remove the namespace from its parent's child hashtable.
*/
if (nsPtr->parentPtr != NULL) {
entryPtr = Tcl_FindHashEntry(&nsPtr->parentPtr->childTable,
nsPtr->name);
if (entryPtr != NULL) {
Tcl_DeleteHashEntry(entryPtr);
}
}
nsPtr->parentPtr = NULL;
/*
* Delete the namespace path if one is installed.
*/
if (nsPtr->commandPathLength != 0) {
UnlinkNsPath(nsPtr);
nsPtr->commandPathLength = 0;
}
if (nsPtr->commandPathSourceList != NULL) {
NamespacePathEntry *nsPathPtr = nsPtr->commandPathSourceList;
do {
if (nsPathPtr->nsPtr != NULL && nsPathPtr->creatorNsPtr != NULL) {
nsPathPtr->creatorNsPtr->cmdRefEpoch++;
}
nsPathPtr->nsPtr = NULL;
nsPathPtr = nsPathPtr->nextPtr;
} while (nsPathPtr != NULL);
nsPtr->commandPathSourceList = NULL;
}
/*
* Delete all the child namespaces.
*
* BE CAREFUL: When each child is deleted, it will divorce itself from its
* parent. You can't traverse a hash table properly if its elements are
* being deleted. We use only the Tcl_FirstHashEntry function to be safe.
*
* Don't optimize to Tcl_NextHashEntry() because of traces.
*/
for (entryPtr = Tcl_FirstHashEntry(&nsPtr->childTable, &search);
entryPtr != NULL;
entryPtr = Tcl_FirstHashEntry(&nsPtr->childTable, &search)) {
childNsPtr = Tcl_GetHashValue(entryPtr);
Tcl_DeleteNamespace(childNsPtr);
}
/*
* Free the namespace's export pattern array.
*/
if (nsPtr->exportArrayPtr != NULL) {
for (i = 0; i < nsPtr->numExportPatterns; i++) {
ckfree(nsPtr->exportArrayPtr[i]);
}
ckfree((char *) nsPtr->exportArrayPtr);
nsPtr->exportArrayPtr = NULL;
nsPtr->numExportPatterns = 0;
nsPtr->maxExportPatterns = 0;
}
/*
* Free any client data associated with the namespace.
*/
if (nsPtr->deleteProc != NULL) {
(*nsPtr->deleteProc)(nsPtr->clientData);
}
nsPtr->deleteProc = NULL;
nsPtr->clientData = NULL;
/*
* Reset the namespace's id field to ensure that this namespace won't be
* interpreted as valid by, e.g., the cache validation code for cached
* command references in Tcl_GetCommandFromObj.
*/
nsPtr->nsId = 0;
}
/*
*----------------------------------------------------------------------
*
* NamespaceFree --
*
* Called after a namespace has been deleted, when its reference count
* reaches 0. Frees the data structure representing the namespace.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
NamespaceFree(
register Namespace *nsPtr) /* Points to the namespace to free. */
{
/*
* Most of the namespace's contents are freed when the namespace is
* deleted by Tcl_DeleteNamespace. All that remains is to free its names
* (for error messages), and the structure itself.
*/
ckfree(nsPtr->name);
ckfree(nsPtr->fullName);
ckfree((char *) nsPtr);
}
/*
*----------------------------------------------------------------------
*
* Tcl_Export --
*
* Makes all the commands matching a pattern available to later be
* imported from the namespace specified by namespacePtr (or the current
* namespace if namespacePtr is NULL). The specified pattern is appended
* onto the namespace's export pattern list, which is optionally cleared
* beforehand.
*
* Results:
* Returns TCL_OK if successful, or TCL_ERROR (along with an error
* message in the interpreter's result) if something goes wrong.
*
* Side effects:
* Appends the export pattern onto the namespace's export list.
* Optionally reset the namespace's export pattern list.
*
*----------------------------------------------------------------------
*/
int
Tcl_Export(
Tcl_Interp *interp, /* Current interpreter. */
Tcl_Namespace *namespacePtr,/* Points to the namespace from which commands
* are to be exported. NULL for the current
* namespace. */
const char *pattern, /* String pattern indicating which commands to
* export. This pattern may not include any
* namespace qualifiers; only commands in the
* specified namespace may be exported. */
int resetListFirst) /* If nonzero, resets the namespace's export
* list before appending. */
{
#define INIT_EXPORT_PATTERNS 5
Namespace *nsPtr, *exportNsPtr, *dummyPtr;
Namespace *currNsPtr = (Namespace *) TclGetCurrentNamespace(interp);
const char *simplePattern;
char *patternCpy;
int neededElems, len, i;
/*
* If the specified namespace is NULL, use the current namespace.
*/
if (namespacePtr == NULL) {
nsPtr = (Namespace *) currNsPtr;
} else {
nsPtr = (Namespace *) namespacePtr;
}
/*
* If resetListFirst is true (nonzero), clear the namespace's export
* pattern list.
*/
if (resetListFirst) {
if (nsPtr->exportArrayPtr != NULL) {
for (i = 0; i < nsPtr->numExportPatterns; i++) {
ckfree(nsPtr->exportArrayPtr[i]);
}
ckfree((char *) nsPtr->exportArrayPtr);
nsPtr->exportArrayPtr = NULL;
TclInvalidateNsCmdLookup(nsPtr);
nsPtr->numExportPatterns = 0;
nsPtr->maxExportPatterns = 0;
}
}
/*
* Check that the pattern doesn't have namespace qualifiers.
*/
TclGetNamespaceForQualName(interp, pattern, nsPtr,
/*flags*/ (TCL_LEAVE_ERR_MSG | TCL_NAMESPACE_ONLY),
&exportNsPtr, &dummyPtr, &dummyPtr, &simplePattern);
if ((exportNsPtr != nsPtr) || (strcmp(pattern, simplePattern) != 0)) {
Tcl_AppendResult(interp, "invalid export pattern \"", pattern,
"\": pattern can't specify a namespace", NULL);
return TCL_ERROR;
}
/*
* Make sure that we don't already have the pattern in the array
*/
if (nsPtr->exportArrayPtr != NULL) {
for (i = 0; i < nsPtr->numExportPatterns; i++) {
if (strcmp(pattern, nsPtr->exportArrayPtr[i]) == 0) {
/*
* The pattern already exists in the list.
*/
return TCL_OK;
}
}
}
/*
* Make sure there is room in the namespace's pattern array for the new
* pattern.
*/
neededElems = nsPtr->numExportPatterns + 1;
if (neededElems > nsPtr->maxExportPatterns) {
nsPtr->maxExportPatterns = nsPtr->maxExportPatterns ?
2 * nsPtr->maxExportPatterns : INIT_EXPORT_PATTERNS;
nsPtr->exportArrayPtr = (char **)
ckrealloc((char *) nsPtr->exportArrayPtr,
sizeof(char *) * nsPtr->maxExportPatterns);
}
/*
* Add the pattern to the namespace's array of export patterns.
*/
len = strlen(pattern);
patternCpy = ckalloc((unsigned) (len + 1));
memcpy(patternCpy, pattern, (unsigned) len + 1);
nsPtr->exportArrayPtr[nsPtr->numExportPatterns] = patternCpy;
nsPtr->numExportPatterns++;
/*
* The list of commands actually exported from the namespace might have
* changed (probably will have!) However, we do not need to recompute this
* just yet; next time we need the info will be soon enough.
*/
TclInvalidateNsCmdLookup(nsPtr);
return TCL_OK;
#undef INIT_EXPORT_PATTERNS
}
/*
*----------------------------------------------------------------------
*
* Tcl_AppendExportList --
*
* Appends onto the argument object the list of export patterns for the
* specified namespace.
*
* Results:
* The return value is normally TCL_OK; in this case the object
* referenced by objPtr has each export pattern appended to it. If an
* error occurs, TCL_ERROR is returned and the interpreter's result holds
* an error message.
*
* Side effects:
* If necessary, the object referenced by objPtr is converted into a list
* object.
*
*----------------------------------------------------------------------
*/
int
Tcl_AppendExportList(
Tcl_Interp *interp, /* Interpreter used for error reporting. */
Tcl_Namespace *namespacePtr,/* Points to the namespace whose export
* pattern list is appended onto objPtr. NULL
* for the current namespace. */
Tcl_Obj *objPtr) /* Points to the Tcl object onto which the
* export pattern list is appended. */
{
Namespace *nsPtr;
int i, result;
/*
* If the specified namespace is NULL, use the current namespace.
*/
if (namespacePtr == NULL) {
nsPtr = (Namespace *) TclGetCurrentNamespace(interp);
} else {
nsPtr = (Namespace *) namespacePtr;
}
/*
* Append the export pattern list onto objPtr.
*/
for (i = 0; i < nsPtr->numExportPatterns; i++) {
result = Tcl_ListObjAppendElement(interp, objPtr,
Tcl_NewStringObj(nsPtr->exportArrayPtr[i], -1));
if (result != TCL_OK) {
return result;
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_Import --
*
* Imports all of the commands matching a pattern into the namespace
* specified by namespacePtr (or the current namespace if contextNsPtr is
* NULL). This is done by creating a new command (the "imported command")
* that points to the real command in its original namespace.
*
* If matching commands are on the autoload path but haven't been loaded
* yet, this command forces them to be loaded, then creates the links to
* them.
*
* Results:
* Returns TCL_OK if successful, or TCL_ERROR (along with an error
* message in the interpreter's result) if something goes wrong.
*
* Side effects:
* Creates new commands in the importing namespace. These indirect calls
* back to the real command and are deleted if the real commands are
* deleted.
*
*----------------------------------------------------------------------
*/
int
Tcl_Import(
Tcl_Interp *interp, /* Current interpreter. */
Tcl_Namespace *namespacePtr,/* Points to the namespace into which the
* commands are to be imported. NULL for the
* current namespace. */
const char *pattern, /* String pattern indicating which commands to
* import. This pattern should be qualified by
* the name of the namespace from which to
* import the command(s). */
int allowOverwrite) /* If nonzero, allow existing commands to be
* overwritten by imported commands. If 0,
* return an error if an imported cmd
* conflicts with an existing one. */
{
Namespace *nsPtr, *importNsPtr, *dummyPtr;
const char *simplePattern;
register Tcl_HashEntry *hPtr;
Tcl_HashSearch search;
/*
* If the specified namespace is NULL, use the current namespace.
*/
if (namespacePtr == NULL) {
nsPtr = (Namespace *) TclGetCurrentNamespace(interp);
} else {
nsPtr = (Namespace *) namespacePtr;
}
/*
* First, invoke the "auto_import" command with the pattern being
* imported. This command is part of the Tcl library. It looks for
* imported commands in autoloaded libraries and loads them in. That way,
* they will be found when we try to create links below.
*
* Note that we don't just call Tcl_EvalObjv() directly because we do not
* want absence of the command to be a failure case.
*/
if (Tcl_FindCommand(interp,"auto_import",NULL,TCL_GLOBAL_ONLY) != NULL) {
Tcl_Obj *objv[2];
int result;
TclNewLiteralStringObj(objv[0], "auto_import");
objv[1] = Tcl_NewStringObj(pattern, -1);
Tcl_IncrRefCount(objv[0]);
Tcl_IncrRefCount(objv[1]);
result = Tcl_EvalObjv(interp, 2, objv, TCL_GLOBAL_ONLY);
Tcl_DecrRefCount(objv[0]);
Tcl_DecrRefCount(objv[1]);
if (result != TCL_OK) {
return TCL_ERROR;
}
Tcl_ResetResult(interp);
}
/*
* From the pattern, find the namespace from which we are importing and
* get the simple pattern (no namespace qualifiers or ::'s) at the end.
*/
if (strlen(pattern) == 0) {
Tcl_SetObjResult(interp, Tcl_NewStringObj("empty import pattern", -1));
return TCL_ERROR;
}
TclGetNamespaceForQualName(interp, pattern, nsPtr,
/*flags*/ (TCL_LEAVE_ERR_MSG | TCL_NAMESPACE_ONLY),
&importNsPtr, &dummyPtr, &dummyPtr, &simplePattern);
if (importNsPtr == NULL) {
Tcl_AppendResult(interp, "unknown namespace in import pattern \"",
pattern, "\"", NULL);
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "NAMESPACE", pattern, NULL);
return TCL_ERROR;
}
if (importNsPtr == nsPtr) {
if (pattern == simplePattern) {
Tcl_AppendResult(interp,
"no namespace specified in import pattern \"", pattern,
"\"", NULL);
} else {
Tcl_AppendResult(interp, "import pattern \"", pattern,
"\" tries to import from namespace \"",
importNsPtr->name, "\" into itself", NULL);
}
return TCL_ERROR;
}
/*
* Scan through the command table in the source namespace and look for
* exported commands that match the string pattern. Create an "imported
* command" in the current namespace for each imported command; these
* commands redirect their invocations to the "real" command.
*/
if ((simplePattern != NULL) && TclMatchIsTrivial(simplePattern)) {
hPtr = Tcl_FindHashEntry(&importNsPtr->cmdTable, simplePattern);
if (hPtr == NULL) {
return TCL_OK;
}
return DoImport(interp, nsPtr, hPtr, simplePattern, pattern,
importNsPtr, allowOverwrite);
}
for (hPtr = Tcl_FirstHashEntry(&importNsPtr->cmdTable, &search);
(hPtr != NULL); hPtr = Tcl_NextHashEntry(&search)) {
char *cmdName = Tcl_GetHashKey(&importNsPtr->cmdTable, hPtr);
if (Tcl_StringMatch(cmdName, simplePattern) &&
DoImport(interp, nsPtr, hPtr, cmdName, pattern, importNsPtr,
allowOverwrite) == TCL_ERROR) {
return TCL_ERROR;
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* DoImport --
*
* Import a particular command from one namespace into another. Helper
* for Tcl_Import().
*
* Results:
* Standard Tcl result code. If TCL_ERROR, appends an error message to
* the interpreter result.
*
* Side effects:
* A new command is created in the target namespace unless this is a
* reimport of exactly the same command as before.
*
*----------------------------------------------------------------------
*/
static int
DoImport(
Tcl_Interp *interp,
Namespace *nsPtr,
Tcl_HashEntry *hPtr,
const char *cmdName,
const char *pattern,
Namespace *importNsPtr,
int allowOverwrite)
{
int i = 0, exported = 0;
Tcl_HashEntry *found;
/*
* The command cmdName in the source namespace matches the pattern. Check
* whether it was exported. If it wasn't, we ignore it.
*/
while (!exported && (i < importNsPtr->numExportPatterns)) {
exported |= Tcl_StringMatch(cmdName, importNsPtr->exportArrayPtr[i++]);
}
if (!exported) {
return TCL_OK;
}
/*
* Unless there is a name clash, create an imported command in the current
* namespace that refers to cmdPtr.
*/
found = Tcl_FindHashEntry(&nsPtr->cmdTable, cmdName);
if ((found == NULL) || allowOverwrite) {
/*
* Create the imported command and its client data. To create the new
* command in the current namespace, generate a fully qualified name
* for it.
*/
Tcl_DString ds;
Tcl_Command importedCmd;
ImportedCmdData *dataPtr;
Command *cmdPtr;
ImportRef *refPtr;
Tcl_DStringInit(&ds);
Tcl_DStringAppend(&ds, nsPtr->fullName, -1);
if (nsPtr != ((Interp *) interp)->globalNsPtr) {
Tcl_DStringAppend(&ds, "::", 2);
}
Tcl_DStringAppend(&ds, cmdName, -1);
/*
* Check whether creating the new imported command in the current
* namespace would create a cycle of imported command references.
*/
cmdPtr = Tcl_GetHashValue(hPtr);
if (found != NULL && cmdPtr->deleteProc == DeleteImportedCmd) {
Command *overwrite = Tcl_GetHashValue(found);
Command *link = cmdPtr;
while (link->deleteProc == DeleteImportedCmd) {
ImportedCmdData *dataPtr = link->objClientData;
link = dataPtr->realCmdPtr;
if (overwrite == link) {
Tcl_AppendResult(interp, "import pattern \"", pattern,
"\" would create a loop containing command \"",
Tcl_DStringValue(&ds), "\"", NULL);
Tcl_DStringFree(&ds);
return TCL_ERROR;
}
}
}
dataPtr = (ImportedCmdData *) ckalloc(sizeof(ImportedCmdData));
importedCmd = Tcl_CreateObjCommand(interp, Tcl_DStringValue(&ds),
InvokeImportedCmd, dataPtr, DeleteImportedCmd);
dataPtr->realCmdPtr = cmdPtr;
dataPtr->selfPtr = (Command *) importedCmd;
dataPtr->selfPtr->compileProc = cmdPtr->compileProc;
Tcl_DStringFree(&ds);
/*
* Create an ImportRef structure describing this new import command
* and add it to the import ref list in the "real" command.
*/
refPtr = (ImportRef *) ckalloc(sizeof(ImportRef));
refPtr->importedCmdPtr = (Command *) importedCmd;
refPtr->nextPtr = cmdPtr->importRefPtr;
cmdPtr->importRefPtr = refPtr;
} else {
Command *overwrite = Tcl_GetHashValue(found);
if (overwrite->deleteProc == DeleteImportedCmd) {
ImportedCmdData *dataPtr = overwrite->objClientData;
if (dataPtr->realCmdPtr == Tcl_GetHashValue(hPtr)) {
/*
* Repeated import of same command is acceptable.
*/
return TCL_OK;
}
}
Tcl_AppendResult(interp, "can't import command \"", cmdName,
"\": already exists", NULL);
return TCL_ERROR;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_ForgetImport --
*
* Deletes commands previously imported into the namespace indicated.
* The by namespacePtr, or the current namespace of interp, when
* namespacePtr is NULL. The pattern controls which imported commands are
* deleted. A simple pattern, one without namespace separators, matches
* the current command names of imported commands in the namespace.
* Matching imported commands are deleted. A qualified pattern is
* interpreted as deletion selection on the basis of where the command is
* imported from. The original command and "first link" command for each
* imported command are determined, and they are matched against the
* pattern. A match leads to deletion of the imported command.
*
* Results:
* Returns TCL_ERROR and records an error message in the interp result if
* a namespace qualified pattern refers to a namespace that does not
* exist. Otherwise, returns TCL_OK.
*
* Side effects:
* May delete commands.
*
*----------------------------------------------------------------------
*/
int
Tcl_ForgetImport(
Tcl_Interp *interp, /* Current interpreter. */
Tcl_Namespace *namespacePtr,/* Points to the namespace from which
* previously imported commands should be
* removed. NULL for current namespace. */
const char *pattern) /* String pattern indicating which imported
* commands to remove. */
{
Namespace *nsPtr, *sourceNsPtr, *dummyPtr;
const char *simplePattern;
char *cmdName;
register Tcl_HashEntry *hPtr;
Tcl_HashSearch search;
/*
* If the specified namespace is NULL, use the current namespace.
*/
if (namespacePtr == NULL) {
nsPtr = (Namespace *) TclGetCurrentNamespace(interp);
} else {
nsPtr = (Namespace *) namespacePtr;
}
/*
* Parse the pattern into its namespace-qualification (if any) and the
* simple pattern.
*/
TclGetNamespaceForQualName(interp, pattern, nsPtr,
/*flags*/ (TCL_LEAVE_ERR_MSG | TCL_NAMESPACE_ONLY),
&sourceNsPtr, &dummyPtr, &dummyPtr, &simplePattern);
if (sourceNsPtr == NULL) {
Tcl_AppendResult(interp,
"unknown namespace in namespace forget pattern \"",
pattern, "\"", NULL);
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "NAMESPACE", pattern, NULL);
return TCL_ERROR;
}
if (strcmp(pattern, simplePattern) == 0) {
/*
* The pattern is simple. Delete any imported commands that match it.
*/
if (TclMatchIsTrivial(simplePattern)) {
Command *cmdPtr;
hPtr = Tcl_FindHashEntry(&nsPtr->cmdTable, simplePattern);
if ((hPtr != NULL)
&& (cmdPtr = Tcl_GetHashValue(hPtr))
&& (cmdPtr->deleteProc == DeleteImportedCmd)) {
Tcl_DeleteCommandFromToken(interp, (Tcl_Command) cmdPtr);
}
return TCL_OK;
}
for (hPtr = Tcl_FirstHashEntry(&nsPtr->cmdTable, &search);
(hPtr != NULL); hPtr = Tcl_NextHashEntry(&search)) {
Command *cmdPtr = Tcl_GetHashValue(hPtr);
if (cmdPtr->deleteProc != DeleteImportedCmd) {
continue;
}
cmdName = Tcl_GetHashKey(&nsPtr->cmdTable, hPtr);
if (Tcl_StringMatch(cmdName, simplePattern)) {
Tcl_DeleteCommandFromToken(interp, (Tcl_Command) cmdPtr);
}
}
return TCL_OK;
}
/*
* The pattern was namespace-qualified.
*/
for (hPtr = Tcl_FirstHashEntry(&nsPtr->cmdTable, &search); (hPtr != NULL);
hPtr = Tcl_NextHashEntry(&search)) {
Tcl_CmdInfo info;
Tcl_Command token = Tcl_GetHashValue(hPtr);
Tcl_Command origin = TclGetOriginalCommand(token);
if (Tcl_GetCommandInfoFromToken(origin, &info) == 0) {
continue; /* Not an imported command. */
}
if (info.namespacePtr != (Tcl_Namespace *) sourceNsPtr) {
/*
* Original not in namespace we're matching. Check the first link
* in the import chain.
*/
Command *cmdPtr = (Command *) token;
ImportedCmdData *dataPtr = cmdPtr->objClientData;
Tcl_Command firstToken = (Tcl_Command) dataPtr->realCmdPtr;
if (firstToken == origin) {
continue;
}
Tcl_GetCommandInfoFromToken(firstToken, &info);
if (info.namespacePtr != (Tcl_Namespace *) sourceNsPtr) {
continue;
}
origin = firstToken;
}
if (Tcl_StringMatch(Tcl_GetCommandName(NULL, origin), simplePattern)) {
Tcl_DeleteCommandFromToken(interp, token);
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* TclGetOriginalCommand --
*
* An imported command is created in an namespace when a "real" command
* is imported from another namespace. If the specified command is an
* imported command, this function returns the original command it refers
* to.
*
* Results:
* If the command was imported into a sequence of namespaces a, b,...,n
* where each successive namespace just imports the command from the
* previous namespace, this function returns the Tcl_Command token in the
* first namespace, a. Otherwise, if the specified command is not an
* imported command, the function returns NULL.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_Command
TclGetOriginalCommand(
Tcl_Command command) /* The imported command for which the original
* command should be returned. */
{
register Command *cmdPtr = (Command *) command;
ImportedCmdData *dataPtr;
if (cmdPtr->deleteProc != DeleteImportedCmd) {
return NULL;
}
while (cmdPtr->deleteProc == DeleteImportedCmd) {
dataPtr = cmdPtr->objClientData;
cmdPtr = dataPtr->realCmdPtr;
}
return (Tcl_Command) cmdPtr;
}
/*
*----------------------------------------------------------------------
*
* InvokeImportedCmd --
*
* Invoked by Tcl whenever the user calls an imported command that was
* created by Tcl_Import. Finds the "real" command (in another
* namespace), and passes control to it.
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Returns a result in the interpreter's result object. If anything goes
* wrong, the result object is set to an error message.
*
*----------------------------------------------------------------------
*/
static int
InvokeImportedCmd(
ClientData clientData, /* Points to the imported command's
* ImportedCmdData structure. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* The argument objects. */
{
register ImportedCmdData *dataPtr = clientData;
register Command *realCmdPtr = dataPtr->realCmdPtr;
return (*realCmdPtr->objProc)(realCmdPtr->objClientData, interp,
objc, objv);
}
/*
*----------------------------------------------------------------------
*
* DeleteImportedCmd --
*
* Invoked by Tcl whenever an imported command is deleted. The "real"
* command keeps a list of all the imported commands that refer to it, so
* those imported commands can be deleted when the real command is
* deleted. This function removes the imported command reference from the
* real command's list, and frees up the memory associated with the
* imported command.
*
* Results:
* None.
*
* Side effects:
* Removes the imported command from the real command's import list.
*
*----------------------------------------------------------------------
*/
static void
DeleteImportedCmd(
ClientData clientData) /* Points to the imported command's
* ImportedCmdData structure. */
{
ImportedCmdData *dataPtr = clientData;
Command *realCmdPtr = dataPtr->realCmdPtr;
Command *selfPtr = dataPtr->selfPtr;
register ImportRef *refPtr, *prevPtr;
prevPtr = NULL;
for (refPtr = realCmdPtr->importRefPtr; refPtr != NULL;
refPtr = refPtr->nextPtr) {
if (refPtr->importedCmdPtr == selfPtr) {
/*
* Remove *refPtr from real command's list of imported commands
* that refer to it.
*/
if (prevPtr == NULL) { /* refPtr is first in list. */
realCmdPtr->importRefPtr = refPtr->nextPtr;
} else {
prevPtr->nextPtr = refPtr->nextPtr;
}
ckfree((char *) refPtr);
ckfree((char *) dataPtr);
return;
}
prevPtr = refPtr;
}
Tcl_Panic("DeleteImportedCmd: did not find cmd in real cmd's list of import references");
}
/*
*----------------------------------------------------------------------
*
* TclGetNamespaceForQualName --
*
* Given a qualified name specifying a command, variable, or namespace,
* and a namespace in which to resolve the name, this function returns a
* pointer to the namespace that contains the item. A qualified name
* consists of the "simple" name of an item qualified by the names of an
* arbitrary number of containing namespace separated by "::"s. If the
* qualified name starts with "::", it is interpreted absolutely from the
* global namespace. Otherwise, it is interpreted relative to the
* namespace specified by cxtNsPtr if it is non-NULL. If cxtNsPtr is
* NULL, the name is interpreted relative to the current namespace.
*
* A relative name like "foo::bar::x" can be found starting in either the
* current namespace or in the global namespace. So each search usually
* follows two tracks, and two possible namespaces are returned. If the
* function sets either *nsPtrPtr or *altNsPtrPtr to NULL, then that path
* failed.
*
* If "flags" contains TCL_GLOBAL_ONLY, the relative qualified name is
* sought only in the global :: namespace. The alternate search (also)
* starting from the global namespace is ignored and *altNsPtrPtr is set
* NULL.
*
* If "flags" contains TCL_NAMESPACE_ONLY, the relative qualified name is
* sought only in the namespace specified by cxtNsPtr. The alternate
* search starting from the global namespace is ignored and *altNsPtrPtr
* is set NULL. If both TCL_GLOBAL_ONLY and TCL_NAMESPACE_ONLY are
* specified, TCL_GLOBAL_ONLY is ignored and the search starts from the
* namespace specified by cxtNsPtr.
*
* If "flags" contains TCL_CREATE_NS_IF_UNKNOWN, all namespace components
* of the qualified name that cannot be found are automatically created
* within their specified parent. This makes sure that functions like
* Tcl_CreateCommand always succeed. There is no alternate search path,
* so *altNsPtrPtr is set NULL.
*
* If "flags" contains TCL_FIND_ONLY_NS, the qualified name is treated as
* a reference to a namespace, and the entire qualified name is followed.
* If the name is relative, the namespace is looked up only in the
* current namespace. A pointer to the namespace is stored in *nsPtrPtr
* and NULL is stored in *simpleNamePtr. Otherwise, if TCL_FIND_ONLY_NS
* is not specified, only the leading components are treated as namespace
* names, and a pointer to the simple name of the final component is
* stored in *simpleNamePtr.
*
* Results:
* It sets *nsPtrPtr and *altNsPtrPtr to point to the two possible
* namespaces which represent the last (containing) namespace in the
* qualified name. If the function sets either *nsPtrPtr or *altNsPtrPtr
* to NULL, then the search along that path failed. The function also
* stores a pointer to the simple name of the final component in
* *simpleNamePtr. If the qualified name is "::" or was treated as a
* namespace reference (TCL_FIND_ONLY_NS), the function stores a pointer
* to the namespace in *nsPtrPtr, NULL in *altNsPtrPtr, and sets
* *simpleNamePtr to point to an empty string.
*
* If there is an error, this function returns TCL_ERROR. If "flags"
* contains TCL_LEAVE_ERR_MSG, an error message is returned in the
* interpreter's result object. Otherwise, the interpreter's result
* object is left unchanged.
*
* *actualCxtPtrPtr is set to the actual context namespace. It is set to
* the input context namespace pointer in cxtNsPtr. If cxtNsPtr is NULL,
* it is set to the current namespace context.
*
* For backwards compatibility with the TclPro byte code loader, this
* function always returns TCL_OK.
*
* Side effects:
* If "flags" contains TCL_CREATE_NS_IF_UNKNOWN, new namespaces may be
* created.
*
*----------------------------------------------------------------------
*/
int
TclGetNamespaceForQualName(
Tcl_Interp *interp, /* Interpreter in which to find the namespace
* containing qualName. */
const char *qualName, /* A namespace-qualified name of an command,
* variable, or namespace. */
Namespace *cxtNsPtr, /* The namespace in which to start the search
* for qualName's namespace. If NULL start
* from the current namespace. Ignored if
* TCL_GLOBAL_ONLY is set. */
int flags, /* Flags controlling the search: an OR'd
* combination of TCL_GLOBAL_ONLY,
* TCL_NAMESPACE_ONLY, TCL_FIND_ONLY_NS, and
* TCL_CREATE_NS_IF_UNKNOWN. */
Namespace **nsPtrPtr, /* Address where function stores a pointer to
* containing namespace if qualName is found
* starting from *cxtNsPtr or, if
* TCL_GLOBAL_ONLY is set, if qualName is
* found in the global :: namespace. NULL is
* stored otherwise. */
Namespace **altNsPtrPtr, /* Address where function stores a pointer to
* containing namespace if qualName is found
* starting from the global :: namespace.
* NULL is stored if qualName isn't found
* starting from :: or if the TCL_GLOBAL_ONLY,
* TCL_NAMESPACE_ONLY, TCL_FIND_ONLY_NS,
* TCL_CREATE_NS_IF_UNKNOWN flag is set. */
Namespace **actualCxtPtrPtr,/* Address where function stores a pointer to
* the actual namespace from which the search
* started. This is either cxtNsPtr, the ::
* namespace if TCL_GLOBAL_ONLY was specified,
* or the current namespace if cxtNsPtr was
* NULL. */
const char **simpleNamePtr) /* Address where function stores the simple
* name at end of the qualName, or NULL if
* qualName is "::" or the flag
* TCL_FIND_ONLY_NS was specified. */
{
Interp *iPtr = (Interp *) interp;
Namespace *nsPtr = cxtNsPtr;
Namespace *altNsPtr;
Namespace *globalNsPtr = iPtr->globalNsPtr;
const char *start, *end;
const char *nsName;
Tcl_HashEntry *entryPtr;
Tcl_DString buffer;
int len;
/*
* Determine the context namespace nsPtr in which to start the primary
* search. If the qualName name starts with a "::" or TCL_GLOBAL_ONLY was
* specified, search from the global namespace. Otherwise, use the
* namespace given in cxtNsPtr, or if that is NULL, use the current
* namespace context. Note that we always treat two or more adjacent ":"s
* as a namespace separator.
*/
if (flags & TCL_GLOBAL_ONLY) {
nsPtr = globalNsPtr;
} else if (nsPtr == NULL) {
nsPtr = iPtr->varFramePtr->nsPtr;
}
start = qualName; /* Points to start of qualifying
* namespace. */
if ((*qualName == ':') && (*(qualName+1) == ':')) {
start = qualName+2; /* Skip over the initial :: */
while (*start == ':') {
start++; /* Skip over a subsequent : */
}
nsPtr = globalNsPtr;
if (*start == '\0') { /* qualName is just two or more
* ":"s. */
*nsPtrPtr = globalNsPtr;
*altNsPtrPtr = NULL;
*actualCxtPtrPtr = globalNsPtr;
*simpleNamePtr = start; /* Points to empty string. */
return TCL_OK;
}
}
*actualCxtPtrPtr = nsPtr;
/*
* Start an alternate search path starting with the global namespace.
* However, if the starting context is the global namespace, or if the
* flag is set to search only the namespace *cxtNsPtr, ignore the
* alternate search path.
*/
altNsPtr = globalNsPtr;
if ((nsPtr == globalNsPtr)
|| (flags & (TCL_NAMESPACE_ONLY | TCL_FIND_ONLY_NS))) {
altNsPtr = NULL;
}
/*
* Loop to resolve each namespace qualifier in qualName.
*/
Tcl_DStringInit(&buffer);
end = start;
while (*start != '\0') {
/*
* Find the next namespace qualifier (i.e., a name ending in "::") or
* the end of the qualified name (i.e., a name ending in "\0"). Set
* len to the number of characters, starting from start, in the name;
* set end to point after the "::"s or at the "\0".
*/
len = 0;
for (end = start; *end != '\0'; end++) {
if ((*end == ':') && (*(end+1) == ':')) {
end += 2; /* Skip over the initial :: */
while (*end == ':') {
end++; /* Skip over the subsequent : */
}
break; /* Exit for loop; end is after ::'s */
}
len++;
}
if (*end=='\0' && !(end-start>=2 && *(end-1)==':' && *(end-2)==':')) {
/*
* qualName ended with a simple name at start. If TCL_FIND_ONLY_NS
* was specified, look this up as a namespace. Otherwise, start is
* the name of a cmd or var and we are done.
*/
if (flags & TCL_FIND_ONLY_NS) {
nsName = start;
} else {
*nsPtrPtr = nsPtr;
*altNsPtrPtr = altNsPtr;
*simpleNamePtr = start;
Tcl_DStringFree(&buffer);
return TCL_OK;
}
} else {
/*
* start points to the beginning of a namespace qualifier ending
* in "::". end points to the start of a name in that namespace
* that might be empty. Copy the namespace qualifier to a buffer
* so it can be null terminated. We can't modify the incoming
* qualName since it may be a string constant.
*/
Tcl_DStringSetLength(&buffer, 0);
Tcl_DStringAppend(&buffer, start, len);
nsName = Tcl_DStringValue(&buffer);
}
/*
* Look up the namespace qualifier nsName in the current namespace
* context. If it isn't found but TCL_CREATE_NS_IF_UNKNOWN is set,
* create that qualifying namespace. This is needed for functions like
* Tcl_CreateCommand that cannot fail.
*/
if (nsPtr != NULL) {
entryPtr = Tcl_FindHashEntry(&nsPtr->childTable, nsName);
if (entryPtr != NULL) {
nsPtr = Tcl_GetHashValue(entryPtr);
} else if (flags & TCL_CREATE_NS_IF_UNKNOWN) {
Tcl_CallFrame *framePtr;
(void) TclPushStackFrame(interp, &framePtr,
(Tcl_Namespace *) nsPtr, /*isProcCallFrame*/ 0);
nsPtr = (Namespace *) Tcl_CreateNamespace(interp, nsName,
NULL, NULL);
TclPopStackFrame(interp);
if (nsPtr == NULL) {
Tcl_Panic("Could not create namespace '%s'", nsName);
}
} else { /* Namespace not found and was not
* created. */
nsPtr = NULL;
}
}
/*
* Look up the namespace qualifier in the alternate search path too.
*/
if (altNsPtr != NULL) {
entryPtr = Tcl_FindHashEntry(&altNsPtr->childTable, nsName);
if (entryPtr != NULL) {
altNsPtr = Tcl_GetHashValue(entryPtr);
} else {
altNsPtr = NULL;
}
}
/*
* If both search paths have failed, return NULL results.
*/
if ((nsPtr == NULL) && (altNsPtr == NULL)) {
*nsPtrPtr = NULL;
*altNsPtrPtr = NULL;
*simpleNamePtr = NULL;
Tcl_DStringFree(&buffer);
return TCL_OK;
}
start = end;
}
/*
* We ignore trailing "::"s in a namespace name, but in a command or
* variable name, trailing "::"s refer to the cmd or var named {}.
*/
if ((flags & TCL_FIND_ONLY_NS) || (end>start && *(end-1)!=':')) {
*simpleNamePtr = NULL; /* Found namespace name. */
} else {
*simpleNamePtr = end; /* Found cmd/var: points to empty
* string. */
}
/*
* As a special case, if we are looking for a namespace and qualName is ""
* and the current active namespace (nsPtr) is not the global namespace,
* return NULL (no namespace was found). This is because namespaces can
* not have empty names except for the global namespace.
*/
if ((flags & TCL_FIND_ONLY_NS) && (*qualName == '\0')
&& (nsPtr != globalNsPtr)) {
nsPtr = NULL;
}
*nsPtrPtr = nsPtr;
*altNsPtrPtr = altNsPtr;
Tcl_DStringFree(&buffer);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_FindNamespace --
*
* Searches for a namespace.
*
* Results:
* Returns a pointer to the namespace if it is found. Otherwise, returns
* NULL and leaves an error message in the interpreter's result object if
* "flags" contains TCL_LEAVE_ERR_MSG.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_Namespace *
Tcl_FindNamespace(
Tcl_Interp *interp, /* The interpreter in which to find the
* namespace. */
const char *name, /* Namespace name. If it starts with "::",
* will be looked up in global namespace.
* Else, looked up first in contextNsPtr
* (current namespace if contextNsPtr is
* NULL), then in global namespace. */
Tcl_Namespace *contextNsPtr,/* Ignored if TCL_GLOBAL_ONLY flag is set or
* if the name starts with "::". Otherwise,
* points to namespace in which to resolve
* name; if NULL, look up name in the current
* namespace. */
register int flags) /* Flags controlling namespace lookup: an OR'd
* combination of TCL_GLOBAL_ONLY and
* TCL_LEAVE_ERR_MSG flags. */
{
Namespace *nsPtr, *dummy1Ptr, *dummy2Ptr;
const char *dummy;
/*
* Find the namespace(s) that contain the specified namespace name. Add
* the TCL_FIND_ONLY_NS flag to resolve the name all the way down to its
* last component, a namespace.
*/
TclGetNamespaceForQualName(interp, name, (Namespace *) contextNsPtr,
flags|TCL_FIND_ONLY_NS, &nsPtr, &dummy1Ptr, &dummy2Ptr, &dummy);
if (nsPtr != NULL) {
return (Tcl_Namespace *) nsPtr;
} else if (flags & TCL_LEAVE_ERR_MSG) {
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "unknown namespace \"", name, "\"", NULL);
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "NAMESPACE", name, NULL);
}
return NULL;
}
/*
*----------------------------------------------------------------------
*
* Tcl_FindCommand --
*
* Searches for a command.
*
* Results:
* Returns a token for the command if it is found. Otherwise, if it can't
* be found or there is an error, returns NULL and leaves an error
* message in the interpreter's result object if "flags" contains
* TCL_LEAVE_ERR_MSG.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_Command
Tcl_FindCommand(
Tcl_Interp *interp, /* The interpreter in which to find the
* command and to report errors. */
const char *name, /* Command's name. If it starts with "::",
* will be looked up in global namespace.
* Else, looked up first in contextNsPtr
* (current namespace if contextNsPtr is
* NULL), then in global namespace. */
Tcl_Namespace *contextNsPtr,/* Ignored if TCL_GLOBAL_ONLY flag set.
* Otherwise, points to namespace in which to
* resolve name. If NULL, look up name in the
* current namespace. */
int flags) /* An OR'd combination of flags:
* TCL_GLOBAL_ONLY (look up name only in
* global namespace), TCL_NAMESPACE_ONLY (look
* up only in contextNsPtr, or the current
* namespace if contextNsPtr is NULL), and
* TCL_LEAVE_ERR_MSG. If both TCL_GLOBAL_ONLY
* and TCL_NAMESPACE_ONLY are given,
* TCL_GLOBAL_ONLY is ignored. */
{
Interp *iPtr = (Interp *) interp;
Namespace *cxtNsPtr;
register Tcl_HashEntry *entryPtr;
register Command *cmdPtr;
const char *simpleName;
int result;
/*
* If this namespace has a command resolver, then give it first crack at
* the command resolution. If the interpreter has any command resolvers,
* consult them next. The command resolver functions may return a
* Tcl_Command value, they may signal to continue onward, or they may
* signal an error.
*/
if ((flags & TCL_GLOBAL_ONLY) || !strncmp(name, "::", 2)) {
cxtNsPtr = (Namespace *) TclGetGlobalNamespace(interp);
} else if (contextNsPtr != NULL) {
cxtNsPtr = (Namespace *) contextNsPtr;
} else {
cxtNsPtr = (Namespace *) TclGetCurrentNamespace(interp);
}
if (cxtNsPtr->cmdResProc != NULL || iPtr->resolverPtr != NULL) {
ResolverScheme *resPtr = iPtr->resolverPtr;
Tcl_Command cmd;
if (cxtNsPtr->cmdResProc) {
result = (*cxtNsPtr->cmdResProc)(interp, name,
(Tcl_Namespace *) cxtNsPtr, flags, &cmd);
} else {
result = TCL_CONTINUE;
}
while (result == TCL_CONTINUE && resPtr) {
if (resPtr->cmdResProc) {
result = (*resPtr->cmdResProc)(interp, name,
(Tcl_Namespace *) cxtNsPtr, flags, &cmd);
}
resPtr = resPtr->nextPtr;
}
if (result == TCL_OK) {
return cmd;
} else if (result != TCL_CONTINUE) {
return NULL;
}
}
/*
* Find the namespace(s) that contain the command.
*/
cmdPtr = NULL;
if (cxtNsPtr->commandPathLength!=0 && strncmp(name, "::", 2)
&& !(flags & TCL_NAMESPACE_ONLY)) {
int i;
Namespace *pathNsPtr, *realNsPtr, *dummyNsPtr;
(void) TclGetNamespaceForQualName(interp, name, cxtNsPtr,
TCL_NAMESPACE_ONLY, &realNsPtr, &dummyNsPtr, &dummyNsPtr,
&simpleName);
if ((realNsPtr != NULL) && (simpleName != NULL)) {
if ((cxtNsPtr == realNsPtr)
|| !(realNsPtr->flags & NS_DYING)) {
entryPtr = Tcl_FindHashEntry(&realNsPtr->cmdTable, simpleName);
if (entryPtr != NULL) {
cmdPtr = Tcl_GetHashValue(entryPtr);
}
}
}
/*
* Next, check along the path.
*/
for (i=0 ; i<cxtNsPtr->commandPathLength && cmdPtr==NULL ; i++) {
pathNsPtr = cxtNsPtr->commandPathArray[i].nsPtr;
if (pathNsPtr == NULL) {
continue;
}
(void) TclGetNamespaceForQualName(interp, name, pathNsPtr,
TCL_NAMESPACE_ONLY, &realNsPtr, &dummyNsPtr, &dummyNsPtr,
&simpleName);
if ((realNsPtr != NULL) && (simpleName != NULL)
&& !(realNsPtr->flags & NS_DYING)) {
entryPtr = Tcl_FindHashEntry(&realNsPtr->cmdTable, simpleName);
if (entryPtr != NULL) {
cmdPtr = Tcl_GetHashValue(entryPtr);
}
}
}
/*
* If we've still not found the command, look in the global namespace
* as a last resort.
*/
if (cmdPtr == NULL) {
(void) TclGetNamespaceForQualName(interp, name, NULL,
TCL_GLOBAL_ONLY, &realNsPtr, &dummyNsPtr, &dummyNsPtr,
&simpleName);
if ((realNsPtr != NULL) && (simpleName != NULL)
&& !(realNsPtr->flags & NS_DYING)) {
entryPtr = Tcl_FindHashEntry(&realNsPtr->cmdTable, simpleName);
if (entryPtr != NULL) {
cmdPtr = Tcl_GetHashValue(entryPtr);
}
}
}
} else {
Namespace *nsPtr[2];
register int search;
TclGetNamespaceForQualName(interp, name, (Namespace *) contextNsPtr,
flags, &nsPtr[0], &nsPtr[1], &cxtNsPtr, &simpleName);
/*
* Look for the command in the command table of its namespace. Be sure
* to check both possible search paths: from the specified namespace
* context and from the global namespace.
*/
for (search = 0; (search < 2) && (cmdPtr == NULL); search++) {
if ((nsPtr[search] != NULL) && (simpleName != NULL)) {
entryPtr = Tcl_FindHashEntry(&nsPtr[search]->cmdTable,
simpleName);
if (entryPtr != NULL) {
cmdPtr = Tcl_GetHashValue(entryPtr);
}
}
}
}
if (cmdPtr != NULL) {
return (Tcl_Command) cmdPtr;
}
if (flags & TCL_LEAVE_ERR_MSG) {
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "unknown command \"", name, "\"", NULL);
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "COMMAND", name, NULL);
}
return NULL;
}
/*
*----------------------------------------------------------------------
*
* TclResetShadowedCmdRefs --
*
* Called when a command is added to a namespace to check for existing
* command references that the new command may invalidate. Consider the
* following cases that could happen when you add a command "foo" to a
* namespace "b":
* 1. It could shadow a command named "foo" at the global scope. If
* it does, all command references in the namespace "b" are
* suspect.
* 2. Suppose the namespace "b" resides in a namespace "a". Then to
* "a" the new command "b::foo" could shadow another command
* "b::foo" in the global namespace. If so, then all command
* references in "a" * are suspect.
* The same checks are applied to all parent namespaces, until we reach
* the global :: namespace.
*
* Results:
* None.
*
* Side effects:
* If the new command shadows an existing command, the cmdRefEpoch
* counter is incremented in each namespace that sees the shadow. This
* invalidates all command references that were previously cached in that
* namespace. The next time the commands are used, they are resolved from
* scratch.
*
*----------------------------------------------------------------------
*/
void
TclResetShadowedCmdRefs(
Tcl_Interp *interp, /* Interpreter containing the new command. */
Command *newCmdPtr) /* Points to the new command. */
{
char *cmdName;
Tcl_HashEntry *hPtr;
register Namespace *nsPtr;
Namespace *trailNsPtr, *shadowNsPtr;
Namespace *globalNsPtr = (Namespace *) TclGetGlobalNamespace(interp);
int found, i;
int trailFront = -1;
int trailSize = 5; /* Formerly NUM_TRAIL_ELEMS. */
Namespace **trailPtr = (Namespace **)
TclStackAlloc(interp, trailSize * sizeof(Namespace *));
/*
* Start at the namespace containing the new command, and work up through
* the list of parents. Stop just before the global namespace, since the
* global namespace can't "shadow" its own entries.
*
* The namespace "trail" list we build consists of the names of each
* namespace that encloses the new command, in order from outermost to
* innermost: for example, "a" then "b". Each iteration of this loop
* eventually extends the trail upwards by one namespace, nsPtr. We use
* this trail list to see if nsPtr (e.g. "a" in 2. above) could have
* now-invalid cached command references. This will happen if nsPtr
* (e.g. "a") contains a sequence of child namespaces (e.g. "b") such that
* there is a identically-named sequence of child namespaces starting from
* :: (e.g. "::b") whose tail namespace contains a command also named
* cmdName.
*/
cmdName = Tcl_GetHashKey(newCmdPtr->hPtr->tablePtr, newCmdPtr->hPtr);
for (nsPtr=newCmdPtr->nsPtr ; (nsPtr!=NULL) && (nsPtr!=globalNsPtr) ;
nsPtr=nsPtr->parentPtr) {
/*
* Find the maximal sequence of child namespaces contained in nsPtr
* such that there is a identically-named sequence of child namespaces
* starting from ::. shadowNsPtr will be the tail of this sequence, or
* the deepest namespace under :: that might contain a command now
* shadowed by cmdName. We check below if shadowNsPtr actually
* contains a command cmdName.
*/
found = 1;
shadowNsPtr = globalNsPtr;
for (i = trailFront; i >= 0; i--) {
trailNsPtr = trailPtr[i];
hPtr = Tcl_FindHashEntry(&shadowNsPtr->childTable,
trailNsPtr->name);
if (hPtr != NULL) {
shadowNsPtr = Tcl_GetHashValue(hPtr);
} else {
found = 0;
break;
}
}
/*
* If shadowNsPtr contains a command named cmdName, we invalidate all
* of the command refs cached in nsPtr. As a boundary case,
* shadowNsPtr is initially :: and we check for case 1. above.
*/
if (found) {
hPtr = Tcl_FindHashEntry(&shadowNsPtr->cmdTable, cmdName);
if (hPtr != NULL) {
nsPtr->cmdRefEpoch++;
TclInvalidateNsPath(nsPtr);
/*
* If the shadowed command was compiled to bytecodes, we
* invalidate all the bytecodes in nsPtr, to force a new
* compilation. We use the resolverEpoch to signal the need
* for a fresh compilation of every bytecode.
*/
if (((Command *)Tcl_GetHashValue(hPtr))->compileProc != NULL) {
nsPtr->resolverEpoch++;
}
}
}
/*
* Insert nsPtr at the front of the trail list: i.e., at the end of
* the trailPtr array.
*/
trailFront++;
if (trailFront == trailSize) {
int newSize = 2 * trailSize;
trailPtr = (Namespace **) TclStackRealloc(interp,
trailPtr, newSize * sizeof(Namespace *));
trailSize = newSize;
}
trailPtr[trailFront] = nsPtr;
}
TclStackFree(interp, trailPtr);
}
/*
*----------------------------------------------------------------------
*
* TclGetNamespaceFromObj, GetNamespaceFromObj --
*
* Gets the namespace specified by the name in a Tcl_Obj.
*
* Results:
* Returns TCL_OK if the namespace was resolved successfully, and stores
* a pointer to the namespace in the location specified by nsPtrPtr. If
* the namespace can't be found, or anything else goes wrong, this
* function returns TCL_ERROR and writes an error message to interp,
* if non-NULL.
*
* Side effects:
* May update the internal representation for the object, caching the
* namespace reference. The next time this function is called, the
* namespace value can be found quickly.
*
*----------------------------------------------------------------------
*/
int
TclGetNamespaceFromObj(
Tcl_Interp *interp, /* The current interpreter. */
Tcl_Obj *objPtr, /* The object to be resolved as the name of a
* namespace. */
Tcl_Namespace **nsPtrPtr) /* Result namespace pointer goes here. */
{
if (GetNamespaceFromObj(interp, objPtr, nsPtrPtr) == TCL_ERROR) {
const char *name = TclGetString(objPtr);
if ((name[0] == ':') && (name[1] == ':')) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"namespace \"%s\" not found", name));
} else {
/*
* Get the current namespace name.
*/
NamespaceCurrentCmd(NULL, interp, 2, NULL);
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"namespace \"%s\" not found in \"%s\"", name,
Tcl_GetStringResult(interp)));
}
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "NAMESPACE", name, NULL);
return TCL_ERROR;
}
return TCL_OK;
}
static int
GetNamespaceFromObj(
Tcl_Interp *interp, /* The current interpreter. */
Tcl_Obj *objPtr, /* The object to be resolved as the name of a
* namespace. */
Tcl_Namespace **nsPtrPtr) /* Result namespace pointer goes here. */
{
ResolvedNsName *resNamePtr;
Namespace *nsPtr, *refNsPtr;
if (objPtr->typePtr == &nsNameType) {
/*
* Check that the ResolvedNsName is still valid; avoid letting the ref
* cross interps.
*/
resNamePtr = (ResolvedNsName *) objPtr->internalRep.twoPtrValue.ptr1;
nsPtr = resNamePtr->nsPtr;
refNsPtr = resNamePtr->refNsPtr;
if (!(nsPtr->flags & NS_DYING) && (interp == nsPtr->interp) &&
(!refNsPtr || ((interp == refNsPtr->interp) &&
(refNsPtr== (Namespace *) Tcl_GetCurrentNamespace(interp))))) {
*nsPtrPtr = (Tcl_Namespace *) nsPtr;
return TCL_OK;
}
}
if (SetNsNameFromAny(interp, objPtr) == TCL_OK) {
resNamePtr = (ResolvedNsName *) objPtr->internalRep.twoPtrValue.ptr1;
*nsPtrPtr = (Tcl_Namespace *) resNamePtr->nsPtr;
return TCL_OK;
}
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* Tcl_NamespaceObjCmd --
*
* Invoked to implement the "namespace" command that creates, deletes, or
* manipulates Tcl namespaces. Handles the following syntax:
*
* namespace children ?name? ?pattern?
* namespace code arg
* namespace current
* namespace delete ?name name...?
* namespace ensemble subcommand ?arg...?
* namespace eval name arg ?arg...?
* namespace exists name
* namespace export ?-clear? ?pattern pattern...?
* namespace forget ?pattern pattern...?
* namespace import ?-force? ?pattern pattern...?
* namespace inscope name arg ?arg...?
* namespace origin name
* namespace parent ?name?
* namespace qualifiers string
* namespace tail string
* namespace which ?-command? ?-variable? name
*
* Results:
* Returns TCL_OK if the command is successful. Returns TCL_ERROR if
* anything goes wrong.
*
* Side effects:
* Based on the subcommand name (e.g., "import"), this function
* dispatches to a corresponding function NamespaceXXXCmd defined
* statically in this file. This function's side effects depend on
* whatever that subcommand function does. If there is an error, this
* function returns an error message in the interpreter's result object.
* Otherwise it may return a result in the interpreter's result object.
*
*----------------------------------------------------------------------
*/
int
Tcl_NamespaceObjCmd(
ClientData clientData, /* Arbitrary value passed to cmd. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
static const char *subCmds[] = {
"children", "code", "current", "delete", "ensemble",
"eval", "exists", "export", "forget", "import",
"inscope", "origin", "parent", "path", "qualifiers",
"tail", "unknown", "upvar", "which", NULL
};
enum NSSubCmdIdx {
NSChildrenIdx, NSCodeIdx, NSCurrentIdx, NSDeleteIdx, NSEnsembleIdx,
NSEvalIdx, NSExistsIdx, NSExportIdx, NSForgetIdx, NSImportIdx,
NSInscopeIdx, NSOriginIdx, NSParentIdx, NSPathIdx, NSQualifiersIdx,
NSTailIdx, NSUnknownIdx, NSUpvarIdx, NSWhichIdx
};
int index, result;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "subcommand ?arg ...?");
return TCL_ERROR;
}
/*
* Return an index reflecting the particular subcommand.
*/
result = Tcl_GetIndexFromObj((Tcl_Interp *) interp, objv[1], subCmds,
"option", /*flags*/ 0, (int *) &index);
if (result != TCL_OK) {
return result;
}
switch (index) {
case NSChildrenIdx:
result = NamespaceChildrenCmd(clientData, interp, objc, objv);
break;
case NSCodeIdx:
result = NamespaceCodeCmd(clientData, interp, objc, objv);
break;
case NSCurrentIdx:
result = NamespaceCurrentCmd(clientData, interp, objc, objv);
break;
case NSDeleteIdx:
result = NamespaceDeleteCmd(clientData, interp, objc, objv);
break;
case NSEnsembleIdx:
result = NamespaceEnsembleCmd(clientData, interp, objc, objv);
break;
case NSEvalIdx:
result = NamespaceEvalCmd(clientData, interp, objc, objv);
break;
case NSExistsIdx:
result = NamespaceExistsCmd(clientData, interp, objc, objv);
break;
case NSExportIdx:
result = NamespaceExportCmd(clientData, interp, objc, objv);
break;
case NSForgetIdx:
result = NamespaceForgetCmd(clientData, interp, objc, objv);
break;
case NSImportIdx:
result = NamespaceImportCmd(clientData, interp, objc, objv);
break;
case NSInscopeIdx:
result = NamespaceInscopeCmd(clientData, interp, objc, objv);
break;
case NSOriginIdx:
result = NamespaceOriginCmd(clientData, interp, objc, objv);
break;
case NSParentIdx:
result = NamespaceParentCmd(clientData, interp, objc, objv);
break;
case NSPathIdx:
result = NamespacePathCmd(clientData, interp, objc, objv);
break;
case NSQualifiersIdx:
result = NamespaceQualifiersCmd(clientData, interp, objc, objv);
break;
case NSTailIdx:
result = NamespaceTailCmd(clientData, interp, objc, objv);
break;
case NSUpvarIdx:
result = NamespaceUpvarCmd(clientData, interp, objc, objv);
break;
case NSUnknownIdx:
result = NamespaceUnknownCmd(clientData, interp, objc, objv);
break;
case NSWhichIdx:
result = NamespaceWhichCmd(clientData, interp, objc, objv);
break;
}
return result;
}
/*
*----------------------------------------------------------------------
*
* NamespaceChildrenCmd --
*
* Invoked to implement the "namespace children" command that returns a
* list containing the fully-qualified names of the child namespaces of a
* given namespace. Handles the following syntax:
*
* namespace children ?name? ?pattern?
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Returns a result in the interpreter's result object. If anything goes
* wrong, the result is an error message.
*
*----------------------------------------------------------------------
*/
static int
NamespaceChildrenCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Namespace *namespacePtr;
Namespace *nsPtr, *childNsPtr;
Namespace *globalNsPtr = (Namespace *) TclGetGlobalNamespace(interp);
char *pattern = NULL;
Tcl_DString buffer;
register Tcl_HashEntry *entryPtr;
Tcl_HashSearch search;
Tcl_Obj *listPtr, *elemPtr;
/*
* Get a pointer to the specified namespace, or the current namespace.
*/
if (objc == 2) {
nsPtr = (Namespace *) TclGetCurrentNamespace(interp);
} else if ((objc == 3) || (objc == 4)) {
if (TclGetNamespaceFromObj(interp, objv[2], &namespacePtr) != TCL_OK) {
return TCL_ERROR;
}
nsPtr = (Namespace *) namespacePtr;
} else {
Tcl_WrongNumArgs(interp, 2, objv, "?name? ?pattern?");
return TCL_ERROR;
}
/*
* Get the glob-style pattern, if any, used to narrow the search.
*/
Tcl_DStringInit(&buffer);
if (objc == 4) {
char *name = TclGetString(objv[3]);
if ((*name == ':') && (*(name+1) == ':')) {
pattern = name;
} else {
Tcl_DStringAppend(&buffer, nsPtr->fullName, -1);
if (nsPtr != globalNsPtr) {
Tcl_DStringAppend(&buffer, "::", 2);
}
Tcl_DStringAppend(&buffer, name, -1);
pattern = Tcl_DStringValue(&buffer);
}
}
/*
* Create a list containing the full names of all child namespaces whose
* names match the specified pattern, if any.
*/
listPtr = Tcl_NewListObj(0, NULL);
if ((pattern != NULL) && TclMatchIsTrivial(pattern)) {
unsigned int length = strlen(nsPtr->fullName);
if (strncmp(pattern, nsPtr->fullName, length) != 0) {
goto searchDone;
}
if (Tcl_FindHashEntry(&nsPtr->childTable, pattern+length) != NULL) {
Tcl_ListObjAppendElement(interp, listPtr,
Tcl_NewStringObj(pattern, -1));
}
goto searchDone;
}
entryPtr = Tcl_FirstHashEntry(&nsPtr->childTable, &search);
while (entryPtr != NULL) {
childNsPtr = Tcl_GetHashValue(entryPtr);
if ((pattern == NULL)
|| Tcl_StringMatch(childNsPtr->fullName, pattern)) {
elemPtr = Tcl_NewStringObj(childNsPtr->fullName, -1);
Tcl_ListObjAppendElement(interp, listPtr, elemPtr);
}
entryPtr = Tcl_NextHashEntry(&search);
}
searchDone:
Tcl_SetObjResult(interp, listPtr);
Tcl_DStringFree(&buffer);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespaceCodeCmd --
*
* Invoked to implement the "namespace code" command to capture the
* namespace context of a command. Handles the following syntax:
*
* namespace code arg
*
* Here "arg" can be a list. "namespace code arg" produces a result
* equivalent to that produced by the command
*
* list ::namespace inscope [namespace current] $arg
*
* However, if "arg" is itself a scoped value starting with "::namespace
* inscope", then the result is just "arg".
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* If anything goes wrong, this function returns an error message as the
* result in the interpreter's result object.
*
*----------------------------------------------------------------------
*/
static int
NamespaceCodeCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Namespace *currNsPtr;
Tcl_Obj *listPtr, *objPtr;
register char *arg, *p;
int length;
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "arg");
return TCL_ERROR;
}
/*
* If "arg" is already a scoped value, then return it directly.
*/
arg = TclGetStringFromObj(objv[2], &length);
while (*arg == ':') {
arg++;
length--;
}
if (*arg=='n' && length>17 && strncmp(arg, "namespace", 9)==0) {
for (p=arg+9 ; isspace(UCHAR(*p)) ; p++) {
/* empty body: skip over whitespace */
}
if (*p=='i' && (p+7 <= arg+length) && strncmp(p, "inscope", 7)==0) {
Tcl_SetObjResult(interp, objv[2]);
return TCL_OK;
}
}
/*
* Otherwise, construct a scoped command by building a list with
* "namespace inscope", the full name of the current namespace, and the
* argument "arg". By constructing a list, we ensure that scoped commands
* are interpreted properly when they are executed later, by the
* "namespace inscope" command.
*/
TclNewObj(listPtr);
TclNewLiteralStringObj(objPtr, "::namespace");
Tcl_ListObjAppendElement(interp, listPtr, objPtr);
TclNewLiteralStringObj(objPtr, "inscope");
Tcl_ListObjAppendElement(interp, listPtr, objPtr);
currNsPtr = (Namespace *) TclGetCurrentNamespace(interp);
if (currNsPtr == (Namespace *) TclGetGlobalNamespace(interp)) {
TclNewLiteralStringObj(objPtr, "::");
} else {
objPtr = Tcl_NewStringObj(currNsPtr->fullName, -1);
}
Tcl_ListObjAppendElement(interp, listPtr, objPtr);
Tcl_ListObjAppendElement(interp, listPtr, objv[2]);
Tcl_SetObjResult(interp, listPtr);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespaceCurrentCmd --
*
* Invoked to implement the "namespace current" command which returns the
* fully-qualified name of the current namespace. Handles the following
* syntax:
*
* namespace current
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Returns a result in the interpreter's result object. If anything goes
* wrong, the result is an error message.
*
*----------------------------------------------------------------------
*/
static int
NamespaceCurrentCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
register Namespace *currNsPtr;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 2, objv, NULL);
return TCL_ERROR;
}
/*
* The "real" name of the global namespace ("::") is the null string, but
* we return "::" for it as a convenience to programmers. Note that "" and
* "::" are treated as synonyms by the namespace code so that it is still
* easy to do things like:
*
* namespace [namespace current]::bar { ... }
*/
currNsPtr = (Namespace *) TclGetCurrentNamespace(interp);
if (currNsPtr == (Namespace *) TclGetGlobalNamespace(interp)) {
Tcl_SetObjResult(interp, Tcl_NewStringObj("::", 2));
} else {
Tcl_SetObjResult(interp, Tcl_NewStringObj(currNsPtr->fullName, -1));
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespaceDeleteCmd --
*
* Invoked to implement the "namespace delete" command to delete
* namespace(s). Handles the following syntax:
*
* namespace delete ?name name...?
*
* Each name identifies a namespace. It may include a sequence of
* namespace qualifiers separated by "::"s. If a namespace is found, it
* is deleted: all variables and procedures contained in that namespace
* are deleted. If that namespace is being used on the call stack, it is
* kept alive (but logically deleted) until it is removed from the call
* stack: that is, it can no longer be referenced by name but any
* currently executing procedure that refers to it is allowed to do so
* until the procedure returns. If the namespace can't be found, this
* function returns an error. If no namespaces are specified, this
* command does nothing.
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Deletes the specified namespaces. If anything goes wrong, this
* function returns an error message in the interpreter's result object.
*
*----------------------------------------------------------------------
*/
static int
NamespaceDeleteCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Namespace *namespacePtr;
char *name;
register int i;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 2, objv, "?name name...?");
return TCL_ERROR;
}
/*
* Destroying one namespace may cause another to be destroyed. Break this
* into two passes: first check to make sure that all namespaces on the
* command line are valid, and report any errors.
*/
for (i = 2; i < objc; i++) {
name = TclGetString(objv[i]);
namespacePtr = Tcl_FindNamespace(interp, name, NULL, /*flags*/ 0);
if ((namespacePtr == NULL)
|| (((Namespace *)namespacePtr)->flags & NS_KILLED)) {
Tcl_AppendResult(interp, "unknown namespace \"",
TclGetString(objv[i]),
"\" in namespace delete command", NULL);
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "NAMESPACE",
TclGetString(objv[i]), NULL);
return TCL_ERROR;
}
}
/*
* Okay, now delete each namespace.
*/
for (i = 2; i < objc; i++) {
name = TclGetString(objv[i]);
namespacePtr = Tcl_FindNamespace(interp, name, NULL, /* flags */ 0);
if (namespacePtr) {
Tcl_DeleteNamespace(namespacePtr);
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespaceEvalCmd --
*
* Invoked to implement the "namespace eval" command. Executes commands
* in a namespace. If the namespace does not already exist, it is
* created. Handles the following syntax:
*
* namespace eval name arg ?arg...?
*
* If more than one arg argument is specified, the command that is
* executed is the result of concatenating the arguments together with a
* space between each argument.
*
* Results:
* Returns TCL_OK if the namespace is found and the commands are executed
* successfully. Returns TCL_ERROR if anything goes wrong.
*
* Side effects:
* Returns the result of the command in the interpreter's result object.
* If anything goes wrong, this function returns an error message as the
* result.
*
*----------------------------------------------------------------------
*/
static int
NamespaceEvalCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Namespace *namespacePtr;
CallFrame *framePtr, **framePtrPtr;
Tcl_Obj *objPtr;
int result;
if (objc < 4) {
Tcl_WrongNumArgs(interp, 2, objv, "name arg ?arg...?");
return TCL_ERROR;
}
/*
* Try to resolve the namespace reference, caching the result in the
* namespace object along the way.
*/
result = GetNamespaceFromObj(interp, objv[2], &namespacePtr);
/*
* If the namespace wasn't found, try to create it.
*/
if (result == TCL_ERROR) {
char *name = TclGetString(objv[2]);
namespacePtr = Tcl_CreateNamespace(interp, name, NULL, NULL);
if (namespacePtr == NULL) {
return TCL_ERROR;
}
}
/*
* Make the specified namespace the current namespace and evaluate the
* command(s).
*/
/* This is needed to satisfy GCC 3.3's strict aliasing rules */
framePtrPtr = &framePtr;
result = TclPushStackFrame(interp, (Tcl_CallFrame **) framePtrPtr,
namespacePtr, /*isProcCallFrame*/ 0);
if (result != TCL_OK) {
return TCL_ERROR;
}
framePtr->objc = objc;
framePtr->objv = objv;
if (objc == 4) {
/*
* TIP #280: Make actual argument location available to eval'd script.
*/
Interp *iPtr = (Interp *) interp;
CmdFrame* invoker = iPtr->cmdFramePtr;
int word = 3;
TclArgumentGet (interp, objv[3], &invoker, &word);
result = TclEvalObjEx(interp, objv[3], 0, invoker, word);
} else {
/*
* More than one argument: concatenate them together with spaces
* between, then evaluate the result. Tcl_EvalObjEx will delete the
* object when it decrements its refcount after eval'ing it.
*/
objPtr = Tcl_ConcatObj(objc-3, objv+3);
/*
* TIP #280: Make invoking context available to eval'd script.
*/
result = TclEvalObjEx(interp, objPtr, TCL_EVAL_DIRECT, NULL, 0);
}
if (result == TCL_ERROR) {
int length = strlen(namespacePtr->fullName);
int limit = 200;
int overflow = (length > limit);
Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
"\n (in namespace eval \"%.*s%s\" script line %d)",
(overflow ? limit : length), namespacePtr->fullName,
(overflow ? "..." : ""), interp->errorLine));
}
/*
* Restore the previous "current" namespace.
*/
TclPopStackFrame(interp);
return result;
}
/*
*----------------------------------------------------------------------
*
* NamespaceExistsCmd --
*
* Invoked to implement the "namespace exists" command that returns true
* if the given namespace currently exists, and false otherwise. Handles
* the following syntax:
*
* namespace exists name
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Returns a result in the interpreter's result object. If anything goes
* wrong, the result is an error message.
*
*----------------------------------------------------------------------
*/
static int
NamespaceExistsCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Namespace *namespacePtr;
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "name");
return TCL_ERROR;
}
Tcl_SetObjResult(interp, Tcl_NewBooleanObj(
GetNamespaceFromObj(interp, objv[2], &namespacePtr) == TCL_OK));
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespaceExportCmd --
*
* Invoked to implement the "namespace export" command that specifies
* which commands are exported from a namespace. The exported commands
* are those that can be imported into another namespace using "namespace
* import". Both commands defined in a namespace and commands the
* namespace has imported can be exported by a namespace. This command
* has the following syntax:
*
* namespace export ?-clear? ?pattern pattern...?
*
* Each pattern may contain "string match"-style pattern matching special
* characters, but the pattern may not include any namespace qualifiers:
* that is, the pattern must specify commands in the current (exporting)
* namespace. The specified patterns are appended onto the namespace's
* list of export patterns.
*
* To reset the namespace's export pattern list, specify the "-clear"
* flag.
*
* If there are no export patterns and the "-clear" flag isn't given,
* this command returns the namespace's current export list.
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Returns a result in the interpreter's result object. If anything goes
* wrong, the result is an error message.
*
*----------------------------------------------------------------------
*/
static int
NamespaceExportCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Namespace *currNsPtr = (Namespace *) TclGetCurrentNamespace(interp);
char *pattern, *string;
int resetListFirst = 0;
int firstArg, patternCt, i, result;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 2, objv, "?-clear? ?pattern pattern...?");
return TCL_ERROR;
}
/*
* Process the optional "-clear" argument.
*/
firstArg = 2;
if (firstArg < objc) {
string = TclGetString(objv[firstArg]);
if (strcmp(string, "-clear") == 0) {
resetListFirst = 1;
firstArg++;
}
}
/*
* If no pattern arguments are given, and "-clear" isn't specified, return
* the namespace's current export pattern list.
*/
patternCt = (objc - firstArg);
if (patternCt == 0) {
if (firstArg > 2) {
return TCL_OK;
} else {
/*
* Create list with export patterns.
*/
Tcl_Obj *listPtr = Tcl_NewListObj(0, NULL);
result = Tcl_AppendExportList(interp, (Tcl_Namespace *) currNsPtr,
listPtr);
if (result != TCL_OK) {
return result;
}
Tcl_SetObjResult(interp, listPtr);
return TCL_OK;
}
}
/*
* Add each pattern to the namespace's export pattern list.
*/
for (i = firstArg; i < objc; i++) {
pattern = TclGetString(objv[i]);
result = Tcl_Export(interp, (Tcl_Namespace *) currNsPtr, pattern,
((i == firstArg)? resetListFirst : 0));
if (result != TCL_OK) {
return result;
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespaceForgetCmd --
*
* Invoked to implement the "namespace forget" command to remove imported
* commands from a namespace. Handles the following syntax:
*
* namespace forget ?pattern pattern...?
*
* Each pattern is a name like "foo::*" or "a::b::x*". That is, the
* pattern may include the special pattern matching characters recognized
* by the "string match" command, but only in the command name at the end
* of the qualified name; the special pattern characters may not appear
* in a namespace name. All of the commands that match that pattern are
* checked to see if they have an imported command in the current
* namespace that refers to the matched command. If there is an alias, it
* is removed.
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Imported commands are removed from the current namespace. If anything
* goes wrong, this function returns an error message in the
* interpreter's result object.
*
*----------------------------------------------------------------------
*/
static int
NamespaceForgetCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
char *pattern;
register int i, result;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 2, objv, "?pattern pattern...?");
return TCL_ERROR;
}
for (i = 2; i < objc; i++) {
pattern = TclGetString(objv[i]);
result = Tcl_ForgetImport(interp, NULL, pattern);
if (result != TCL_OK) {
return result;
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespaceImportCmd --
*
* Invoked to implement the "namespace import" command that imports
* commands into a namespace. Handles the following syntax:
*
* namespace import ?-force? ?pattern pattern...?
*
* Each pattern is a namespace-qualified name like "foo::*", "a::b::x*",
* or "bar::p". That is, the pattern may include the special pattern
* matching characters recognized by the "string match" command, but only
* in the command name at the end of the qualified name; the special
* pattern characters may not appear in a namespace name. All of the
* commands that match the pattern and which are exported from their
* namespace are made accessible from the current namespace context. This
* is done by creating a new "imported command" in the current namespace
* that points to the real command in its original namespace; when the
* imported command is called, it invokes the real command.
*
* If an imported command conflicts with an existing command, it is
* treated as an error. But if the "-force" option is included, then
* existing commands are overwritten by the imported commands.
*
* If there are no pattern arguments and the "-force" flag isn't given,
* this command returns the list of commands currently imported in
* the current namespace.
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Adds imported commands to the current namespace. If anything goes
* wrong, this function returns an error message in the interpreter's
* result object.
*
*----------------------------------------------------------------------
*/
static int
NamespaceImportCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
int allowOverwrite = 0;
char *string, *pattern;
register int i, result;
int firstArg;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 2, objv, "?-force? ?pattern pattern...?");
return TCL_ERROR;
}
/*
* Skip over the optional "-force" as the first argument.
*/
firstArg = 2;
if (firstArg < objc) {
string = TclGetString(objv[firstArg]);
if ((*string == '-') && (strcmp(string, "-force") == 0)) {
allowOverwrite = 1;
firstArg++;
}
} else {
/*
* When objc == 2, command is just [namespace import]. Introspection
* form to return list of imported commands.
*/
Tcl_HashEntry *hPtr;
Tcl_HashSearch search;
Namespace *nsPtr = (Namespace *) TclGetCurrentNamespace(interp);
Tcl_Obj *listPtr;
TclNewObj(listPtr);
for (hPtr = Tcl_FirstHashEntry(&nsPtr->cmdTable, &search);
hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
Command *cmdPtr = Tcl_GetHashValue(hPtr);
if (cmdPtr->deleteProc == DeleteImportedCmd) {
Tcl_ListObjAppendElement(NULL, listPtr, Tcl_NewStringObj(
Tcl_GetHashKey(&nsPtr->cmdTable, hPtr) ,-1));
}
}
Tcl_SetObjResult(interp, listPtr);
return TCL_OK;
}
/*
* Handle the imports for each of the patterns.
*/
for (i = firstArg; i < objc; i++) {
pattern = TclGetString(objv[i]);
result = Tcl_Import(interp, NULL, pattern, allowOverwrite);
if (result != TCL_OK) {
return result;
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespaceInscopeCmd --
*
* Invoked to implement the "namespace inscope" command that executes a
* script in the context of a particular namespace. This command is not
* expected to be used directly by programmers; calls to it are generated
* implicitly when programs use "namespace code" commands to register
* callback scripts. Handles the following syntax:
*
* namespace inscope name arg ?arg...?
*
* The "namespace inscope" command is much like the "namespace eval"
* command except that it has lappend semantics and the namespace must
* already exist. It treats the first argument as a list, and appends any
* arguments after the first onto the end as proper list elements. For
* example,
*
* namespace inscope ::foo {a b} c d e
*
* is equivalent to
*
* namespace eval ::foo [concat {a b} [list c d e]]
*
* This lappend semantics is important because many callback scripts are
* actually prefixes.
*
* Results:
* Returns TCL_OK to indicate success, or TCL_ERROR to indicate failure.
*
* Side effects:
* Returns a result in the Tcl interpreter's result object.
*
*----------------------------------------------------------------------
*/
static int
NamespaceInscopeCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Namespace *namespacePtr;
CallFrame *framePtr, **framePtrPtr;
int i, result;
if (objc < 4) {
Tcl_WrongNumArgs(interp, 2, objv, "name arg ?arg...?");
return TCL_ERROR;
}
/*
* Resolve the namespace reference.
*/
if (TclGetNamespaceFromObj(interp, objv[2], &namespacePtr) != TCL_OK) {
return TCL_ERROR;
}
/*
* Make the specified namespace the current namespace.
*/
framePtrPtr = &framePtr; /* This is needed to satisfy GCC's
* strict aliasing rules. */
result = TclPushStackFrame(interp, (Tcl_CallFrame **) framePtrPtr,
namespacePtr, /*isProcCallFrame*/ 0);
if (result != TCL_OK) {
return result;
}
framePtr->objc = objc;
framePtr->objv = objv;
/*
* Execute the command. If there is just one argument, just treat it as a
* script and evaluate it. Otherwise, create a list from the arguments
* after the first one, then concatenate the first argument and the list
* of extra arguments to form the command to evaluate.
*/
if (objc == 4) {
result = Tcl_EvalObjEx(interp, objv[3], 0);
} else {
Tcl_Obj *concatObjv[2];
register Tcl_Obj *listPtr, *cmdObjPtr;
listPtr = Tcl_NewListObj(0, NULL);
for (i = 4; i < objc; i++) {
if (Tcl_ListObjAppendElement(interp, listPtr, objv[i]) != TCL_OK) {
Tcl_DecrRefCount(listPtr); /* Free unneeded obj. */
return TCL_ERROR;
}
}
concatObjv[0] = objv[3];
concatObjv[1] = listPtr;
cmdObjPtr = Tcl_ConcatObj(2, concatObjv);
result = Tcl_EvalObjEx(interp, cmdObjPtr, TCL_EVAL_DIRECT);
Tcl_DecrRefCount(listPtr); /* We're done with the list object. */
}
if (result == TCL_ERROR) {
int length = strlen(namespacePtr->fullName);
int limit = 200;
int overflow = (length > limit);
Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
"\n (in namespace inscope \"%.*s%s\" script line %d)",
(overflow ? limit : length), namespacePtr->fullName,
(overflow ? "..." : ""), interp->errorLine));
}
/*
* Restore the previous "current" namespace.
*/
TclPopStackFrame(interp);
return result;
}
/*
*----------------------------------------------------------------------
*
* NamespaceOriginCmd --
*
* Invoked to implement the "namespace origin" command to return the
* fully-qualified name of the "real" command to which the specified
* "imported command" refers. Handles the following syntax:
*
* namespace origin name
*
* Results:
* An imported command is created in an namespace when that namespace
* imports a command from another namespace. If a command is imported
* into a sequence of namespaces a, b,...,n where each successive
* namespace just imports the command from the previous namespace, this
* command returns the fully-qualified name of the original command in
* the first namespace, a. If "name" does not refer to an alias, its
* fully-qualified name is returned. The returned name is stored in the
* interpreter's result object. This function returns TCL_OK if
* successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* If anything goes wrong, this function returns an error message in the
* interpreter's result object.
*
*----------------------------------------------------------------------
*/
static int
NamespaceOriginCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Command command, origCommand;
Tcl_Obj *resultPtr;
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "name");
return TCL_ERROR;
}
command = Tcl_GetCommandFromObj(interp, objv[2]);
if (command == NULL) {
Tcl_AppendResult(interp, "invalid command name \"",
TclGetString(objv[2]), "\"", NULL);
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "COMMAND",
TclGetString(objv[2]), NULL);
return TCL_ERROR;
}
origCommand = TclGetOriginalCommand(command);
TclNewObj(resultPtr);
if (origCommand == NULL) {
/*
* The specified command isn't an imported command. Return the
* command's name qualified by the full name of the namespace it was
* defined in.
*/
Tcl_GetCommandFullName(interp, command, resultPtr);
} else {
Tcl_GetCommandFullName(interp, origCommand, resultPtr);
}
Tcl_SetObjResult(interp, resultPtr);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespaceParentCmd --
*
* Invoked to implement the "namespace parent" command that returns the
* fully-qualified name of the parent namespace for a specified
* namespace. Handles the following syntax:
*
* namespace parent ?name?
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Returns a result in the interpreter's result object. If anything goes
* wrong, the result is an error message.
*
*----------------------------------------------------------------------
*/
static int
NamespaceParentCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Namespace *nsPtr;
if (objc == 2) {
nsPtr = TclGetCurrentNamespace(interp);
} else if (objc == 3) {
if (TclGetNamespaceFromObj(interp, objv[2], &nsPtr) != TCL_OK) {
return TCL_ERROR;
}
} else {
Tcl_WrongNumArgs(interp, 2, objv, "?name?");
return TCL_ERROR;
}
/*
* Report the parent of the specified namespace.
*/
if (nsPtr->parentPtr != NULL) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
nsPtr->parentPtr->fullName, -1));
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespacePathCmd --
*
* Invoked to implement the "namespace path" command that reads and
* writes the current namespace's command resolution path. Has one
* optional argument: if present, it is a list of named namespaces to set
* the path to, and if absent, the current path should be returned.
* Handles the following syntax:
*
* namespace path ?nsList?
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong
* (most notably if the namespace list contains the name of something
* other than a namespace). In the successful-exit case, may set the
* interpreter result to the list of names of the namespaces on the
* current namespace's path.
*
* Side effects:
* May update the namespace path (triggering a recomputing of all command
* names that depend on the namespace for resolution).
*
*----------------------------------------------------------------------
*/
static int
NamespacePathCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Namespace *nsPtr = (Namespace *) TclGetCurrentNamespace(interp);
int i, nsObjc, result = TCL_ERROR;
Tcl_Obj **nsObjv;
Tcl_Namespace **namespaceList = NULL;
if (objc > 3) {
Tcl_WrongNumArgs(interp, 2, objv, "?pathList?");
return TCL_ERROR;
}
/*
* If no path is given, return the current path.
*/
if (objc == 2) {
/*
* Not a very fast way to compute this, but easy to get right.
*/
for (i=0 ; i<nsPtr->commandPathLength ; i++) {
if (nsPtr->commandPathArray[i].nsPtr != NULL) {
Tcl_AppendElement(interp,
nsPtr->commandPathArray[i].nsPtr->fullName);
}
}
return TCL_OK;
}
/*
* There is a path given, so parse it into an array of namespace pointers.
*/
if (TclListObjGetElements(interp, objv[2], &nsObjc, &nsObjv) != TCL_OK) {
goto badNamespace;
}
if (nsObjc != 0) {
namespaceList = (Tcl_Namespace **)
TclStackAlloc(interp, sizeof(Tcl_Namespace *) * nsObjc);
for (i=0 ; i<nsObjc ; i++) {
if (TclGetNamespaceFromObj(interp, nsObjv[i],
&namespaceList[i]) != TCL_OK) {
goto badNamespace;
}
}
}
/*
* Now we have the list of valid namespaces, install it as the path.
*/
TclSetNsPath(nsPtr, nsObjc, namespaceList);
result = TCL_OK;
badNamespace:
if (namespaceList != NULL) {
TclStackFree(interp, namespaceList);
}
return result;
}
/*
*----------------------------------------------------------------------
*
* TclSetNsPath --
*
* Sets the namespace command name resolution path to the given list of
* namespaces. If the list is empty (of zero length) the path is set to
* empty and the default old-style behaviour of command name resolution
* is used.
*
* Results:
* nothing
*
* Side effects:
* Invalidates the command name resolution caches for any command
* resolved in the given namespace.
*
*----------------------------------------------------------------------
*/
void
TclSetNsPath(
Namespace *nsPtr, /* Namespace whose path is to be set. */
int pathLength, /* Length of pathAry. */
Tcl_Namespace *pathAry[]) /* Array of namespaces that are the path. */
{
if (pathLength != 0) {
NamespacePathEntry *tmpPathArray = (NamespacePathEntry *)
ckalloc(sizeof(NamespacePathEntry) * pathLength);
int i;
for (i=0 ; i<pathLength ; i++) {
tmpPathArray[i].nsPtr = (Namespace *) pathAry[i];
tmpPathArray[i].creatorNsPtr = nsPtr;
tmpPathArray[i].prevPtr = NULL;
tmpPathArray[i].nextPtr =
tmpPathArray[i].nsPtr->commandPathSourceList;
if (tmpPathArray[i].nextPtr != NULL) {
tmpPathArray[i].nextPtr->prevPtr = &tmpPathArray[i];
}
tmpPathArray[i].nsPtr->commandPathSourceList = &tmpPathArray[i];
}
if (nsPtr->commandPathLength != 0) {
UnlinkNsPath(nsPtr);
}
nsPtr->commandPathArray = tmpPathArray;
} else {
if (nsPtr->commandPathLength != 0) {
UnlinkNsPath(nsPtr);
}
}
nsPtr->commandPathLength = pathLength;
nsPtr->cmdRefEpoch++;
nsPtr->resolverEpoch++;
}
/*
*----------------------------------------------------------------------
*
* UnlinkNsPath --
*
* Delete the given namespace's command name resolution path. Only call
* if the path is non-empty. Caller must reset the counter containing the
* path size.
*
* Results:
* nothing
*
* Side effects:
* Deletes the array of path entries and unlinks those path entries from
* the target namespace's list of interested namespaces.
*
*----------------------------------------------------------------------
*/
static void
UnlinkNsPath(
Namespace *nsPtr)
{
int i;
for (i=0 ; i<nsPtr->commandPathLength ; i++) {
NamespacePathEntry *nsPathPtr = &nsPtr->commandPathArray[i];
if (nsPathPtr->prevPtr != NULL) {
nsPathPtr->prevPtr->nextPtr = nsPathPtr->nextPtr;
}
if (nsPathPtr->nextPtr != NULL) {
nsPathPtr->nextPtr->prevPtr = nsPathPtr->prevPtr;
}
if (nsPathPtr->nsPtr != NULL) {
if (nsPathPtr->nsPtr->commandPathSourceList == nsPathPtr) {
nsPathPtr->nsPtr->commandPathSourceList = nsPathPtr->nextPtr;
}
}
}
ckfree((char *) nsPtr->commandPathArray);
}
/*
*----------------------------------------------------------------------
*
* TclInvalidateNsPath --
*
* Invalidate the name resolution caches for all names looked up in
* namespaces whose name path includes the given namespace.
*
* Results:
* nothing
*
* Side effects:
* Increments the command reference epoch in each namespace whose path
* includes the given namespace. This causes any cached resolved names
* whose root cacheing context starts at that namespace to be recomputed
* the next time they are used.
*
*----------------------------------------------------------------------
*/
void
TclInvalidateNsPath(
Namespace *nsPtr)
{
NamespacePathEntry *nsPathPtr = nsPtr->commandPathSourceList;
while (nsPathPtr != NULL) {
if (nsPathPtr->nsPtr != NULL) {
nsPathPtr->creatorNsPtr->cmdRefEpoch++;
}
nsPathPtr = nsPathPtr->nextPtr;
}
}
/*
*----------------------------------------------------------------------
*
* NamespaceQualifiersCmd --
*
* Invoked to implement the "namespace qualifiers" command that returns
* any leading namespace qualifiers in a string. These qualifiers are
* namespace names separated by "::"s. For example, for "::foo::p" this
* command returns "::foo", and for "::" it returns "". This command is
* the complement of the "namespace tail" command. Note that this command
* does not check whether the "namespace" names are, in fact, the names
* of currently defined namespaces. Handles the following syntax:
*
* namespace qualifiers string
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Returns a result in the interpreter's result object. If anything goes
* wrong, the result is an error message.
*
*----------------------------------------------------------------------
*/
static int
NamespaceQualifiersCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
register char *name, *p;
int length;
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "string");
return TCL_ERROR;
}
/*
* Find the end of the string, then work backward and find the start of
* the last "::" qualifier.
*/
name = TclGetString(objv[2]);
for (p = name; *p != '\0'; p++) {
/* empty body */
}
while (--p >= name) {
if ((*p == ':') && (p > name) && (*(p-1) == ':')) {
p -= 2; /* Back up over the :: */
while ((p >= name) && (*p == ':')) {
p--; /* Back up over the preceeding : */
}
break;
}
}
if (p >= name) {
length = p-name+1;
Tcl_SetObjResult(interp, Tcl_NewStringObj(name, length));
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespaceUnknownCmd --
*
* Invoked to implement the "namespace unknown" command (TIP 181) that
* sets or queries a per-namespace unknown command handler. This handler
* is called when command lookup fails (current and global ns). The
* default handler for the global namespace is ::unknown. The default
* handler for other namespaces is to call the global namespace unknown
* handler. Passing an empty list results in resetting the handler to its
* default.
*
* namespace unknown ?handler?
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* If no handler is specified, returns a result in the interpreter's
* result object, otherwise it sets the unknown handler pointer in the
* current namespace to the script fragment provided. If anything goes
* wrong, the result is an error message.
*
*----------------------------------------------------------------------
*/
static int
NamespaceUnknownCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Namespace *currNsPtr;
Tcl_Obj *resultPtr;
int rc;
if (objc > 3) {
Tcl_WrongNumArgs(interp, 2, objv, "?script?");
return TCL_ERROR;
}
currNsPtr = TclGetCurrentNamespace(interp);
if (objc == 2) {
/*
* Introspection - return the current namespace handler.
*/
resultPtr = Tcl_GetNamespaceUnknownHandler(interp, currNsPtr);
if (resultPtr == NULL) {
TclNewObj(resultPtr);
}
Tcl_SetObjResult(interp, resultPtr);
} else {
rc = Tcl_SetNamespaceUnknownHandler(interp, currNsPtr, objv[2]);
if (rc == TCL_OK) {
Tcl_SetObjResult(interp, objv[2]);
}
return rc;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetNamespaceUnknownHandler --
*
* Returns the unknown command handler registered for the given
* namespace.
*
* Results:
* Returns the current unknown command handler, or NULL if none exists
* for the namespace.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
Tcl_GetNamespaceUnknownHandler(
Tcl_Interp *interp, /* The interpreter in which the namespace
* exists. */
Tcl_Namespace *nsPtr) /* The namespace. */
{
Namespace *currNsPtr = (Namespace *)nsPtr;
if (currNsPtr->unknownHandlerPtr == NULL &&
currNsPtr == ((Interp *)interp)->globalNsPtr) {
/*
* Default handler for global namespace is "::unknown". For all other
* namespaces, it is NULL (which falls back on the global unknown
* handler).
*/
TclNewLiteralStringObj(currNsPtr->unknownHandlerPtr, "::unknown");
Tcl_IncrRefCount(currNsPtr->unknownHandlerPtr);
}
return currNsPtr->unknownHandlerPtr;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetNamespaceUnknownHandler --
*
* Sets the unknown command handler for the given namespace to the
* command prefix passed.
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Sets the namespace unknown command handler. If the passed in handler
* is NULL or an empty list, then the handler is reset to its default. If
* an error occurs, then an error message is left in the interpreter
* result.
*
*----------------------------------------------------------------------
*/
int
Tcl_SetNamespaceUnknownHandler(
Tcl_Interp *interp, /* Interpreter in which the namespace
* exists. */
Tcl_Namespace *nsPtr, /* Namespace which is being updated. */
Tcl_Obj *handlerPtr) /* The new handler, or NULL to reset. */
{
int lstlen = 0;
Namespace *currNsPtr = (Namespace *)nsPtr;
/*
* Ensure that we check for errors *first* before we change anything.
*/
if (handlerPtr != NULL) {
if (TclListObjLength(interp, handlerPtr, &lstlen) != TCL_OK) {
/*
* Not a list.
*/
return TCL_ERROR;
}
if (lstlen > 0) {
/*
* We are going to be saving this handler. Increment the reference
* count before decrementing the refcount on the previous handler,
* so that nothing strange can happen if we are told to set the
* handler to the previous value.
*/
Tcl_IncrRefCount(handlerPtr);
}
}
/*
* Remove old handler next.
*/
if (currNsPtr->unknownHandlerPtr != NULL) {
Tcl_DecrRefCount(currNsPtr->unknownHandlerPtr);
}
/*
* Install the new handler.
*/
if (lstlen > 0) {
/*
* Just store the handler. It already has the correct reference count.
*/
currNsPtr->unknownHandlerPtr = handlerPtr;
} else {
/*
* If NULL or an empty list is passed, this resets to the default
* handler.
*/
currNsPtr->unknownHandlerPtr = NULL;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespaceTailCmd --
*
* Invoked to implement the "namespace tail" command that returns the
* trailing name at the end of a string with "::" namespace qualifiers.
* These qualifiers are namespace names separated by "::"s. For example,
* for "::foo::p" this command returns "p", and for "::" it returns "".
* This command is the complement of the "namespace qualifiers" command.
* Note that this command does not check whether the "namespace" names
* are, in fact, the names of currently defined namespaces. Handles the
* following syntax:
*
* namespace tail string
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Returns a result in the interpreter's result object. If anything goes
* wrong, the result is an error message.
*
*----------------------------------------------------------------------
*/
static int
NamespaceTailCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
register char *name, *p;
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "string");
return TCL_ERROR;
}
/*
* Find the end of the string, then work backward and find the last "::"
* qualifier.
*/
name = TclGetString(objv[2]);
for (p = name; *p != '\0'; p++) {
/* empty body */
}
while (--p > name) {
if ((*p == ':') && (*(p-1) == ':')) {
p++; /* Just after the last "::" */
break;
}
}
if (p >= name) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(p, -1));
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespaceUpvarCmd --
*
* Invoked to implement the "namespace upvar" command, that creates
* variables in the current scope linked to variables in another
* namespace. Handles the following syntax:
*
* namespace upvar ns otherVar myVar ?otherVar myVar ...?
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Creates new variables in the current scope, linked to the
* corresponding variables in the stipulated nmamespace. If anything goes
* wrong, the result is an error message.
*
*----------------------------------------------------------------------
*/
static int
NamespaceUpvarCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Interp *iPtr = (Interp *) interp;
Tcl_Namespace *nsPtr, *savedNsPtr;
Var *otherPtr, *arrayPtr;
char *myName;
if (objc < 5 || !(objc & 1)) {
Tcl_WrongNumArgs(interp, 2, objv,
"ns otherVar myVar ?otherVar myVar ...?");
return TCL_ERROR;
}
if (TclGetNamespaceFromObj(interp, objv[2], &nsPtr) != TCL_OK) {
return TCL_ERROR;
}
objc -= 3;
objv += 3;
for (; objc>0 ; objc-=2, objv+=2) {
/*
* Locate the other variable
*/
savedNsPtr = (Tcl_Namespace *) iPtr->varFramePtr->nsPtr;
iPtr->varFramePtr->nsPtr = (Namespace *) nsPtr;
otherPtr = TclObjLookupVarEx(interp, objv[0], NULL,
(TCL_NAMESPACE_ONLY | TCL_LEAVE_ERR_MSG), "access",
/*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
iPtr->varFramePtr->nsPtr = (Namespace *) savedNsPtr;
if (otherPtr == NULL) {
return TCL_ERROR;
}
/*
* Create the new variable and link it to otherPtr.
*/
myName = TclGetString(objv[1]);
if (TclPtrMakeUpvar(interp, otherPtr, myName, 0, -1) != TCL_OK) {
return TCL_ERROR;
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespaceWhichCmd --
*
* Invoked to implement the "namespace which" command that returns the
* fully-qualified name of a command or variable. If the specified
* command or variable does not exist, it returns "". Handles the
* following syntax:
*
* namespace which ?-command? ?-variable? name
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Returns a result in the interpreter's result object. If anything goes
* wrong, the result is an error message.
*
*----------------------------------------------------------------------
*/
static int
NamespaceWhichCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
static const char *opts[] = {
"-command", "-variable", NULL
};
int lookupType = 0;
Tcl_Obj *resultPtr;
if (objc < 3 || objc > 4) {
badArgs:
Tcl_WrongNumArgs(interp, 2, objv, "?-command? ?-variable? name");
return TCL_ERROR;
} else if (objc == 4) {
/*
* Look for a flag controlling the lookup.
*/
if (Tcl_GetIndexFromObj(interp, objv[2], opts, "option", 0,
&lookupType) != TCL_OK) {
/*
* Preserve old style of error message!
*/
Tcl_ResetResult(interp);
goto badArgs;
}
}
TclNewObj(resultPtr);
switch (lookupType) {
case 0: { /* -command */
Tcl_Command cmd = Tcl_GetCommandFromObj(interp, objv[objc-1]);
if (cmd != NULL) {
Tcl_GetCommandFullName(interp, cmd, resultPtr);
}
break;
}
case 1: { /* -variable */
Tcl_Var var = Tcl_FindNamespaceVar(interp,
TclGetString(objv[objc-1]), NULL, /*flags*/ 0);
if (var != NULL) {
Tcl_GetVariableFullName(interp, var, resultPtr);
}
break;
}
}
Tcl_SetObjResult(interp, resultPtr);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* FreeNsNameInternalRep --
*
* Frees the resources associated with a nsName object's internal
* representation.
*
* Results:
* None.
*
* Side effects:
* Decrements the ref count of any Namespace structure pointed to by the
* nsName's internal representation. If there are no more references to
* the namespace, it's structure will be freed.
*
*----------------------------------------------------------------------
*/
static void
FreeNsNameInternalRep(
register Tcl_Obj *objPtr) /* nsName object with internal representation
* to free. */
{
register ResolvedNsName *resNamePtr = (ResolvedNsName *)
objPtr->internalRep.twoPtrValue.ptr1;
Namespace *nsPtr;
/*
* Decrement the reference count of the namespace. If there are no more
* references, free it up.
*/
resNamePtr->refCount--;
if (resNamePtr->refCount == 0) {
/*
* Decrement the reference count for the cached namespace. If the
* namespace is dead, and there are no more references to it, free
* it.
*/
nsPtr = resNamePtr->nsPtr;
nsPtr->refCount--;
if ((nsPtr->refCount == 0) && (nsPtr->flags & NS_DEAD)) {
NamespaceFree(nsPtr);
}
ckfree((char *) resNamePtr);
}
}
/*
*----------------------------------------------------------------------
*
* DupNsNameInternalRep --
*
* Initializes the internal representation of a nsName object to a copy
* of the internal representation of another nsName object.
*
* Results:
* None.
*
* Side effects:
* copyPtr's internal rep is set to refer to the same namespace
* referenced by srcPtr's internal rep. Increments the ref count of the
* ResolvedNsName structure used to hold the namespace reference.
*
*----------------------------------------------------------------------
*/
static void
DupNsNameInternalRep(
Tcl_Obj *srcPtr, /* Object with internal rep to copy. */
register Tcl_Obj *copyPtr) /* Object with internal rep to set. */
{
register ResolvedNsName *resNamePtr = (ResolvedNsName *)
srcPtr->internalRep.twoPtrValue.ptr1;
copyPtr->internalRep.twoPtrValue.ptr1 = resNamePtr;
resNamePtr->refCount++;
copyPtr->typePtr = &nsNameType;
}
/*
*----------------------------------------------------------------------
*
* SetNsNameFromAny --
*
* Attempt to generate a nsName internal representation for a Tcl object.
*
* Results:
* Returns TCL_OK if the value could be converted to a proper namespace
* reference. Otherwise, it returns TCL_ERROR, along with an error
* message in the interpreter's result object.
*
* Side effects:
* If successful, the object is made a nsName object. Its internal rep is
* set to point to a ResolvedNsName, which contains a cached pointer to
* the Namespace. Reference counts are kept on both the ResolvedNsName
* and the Namespace, so we can keep track of their usage and free them
* when appropriate.
*
*----------------------------------------------------------------------
*/
static int
SetNsNameFromAny(
Tcl_Interp *interp, /* Points to the namespace in which to resolve
* name. Also used for error reporting if not
* NULL. */
register Tcl_Obj *objPtr) /* The object to convert. */
{
const char *dummy;
Namespace *nsPtr, *dummy1Ptr, *dummy2Ptr;
register ResolvedNsName *resNamePtr;
const char *name = TclGetString(objPtr);
TclGetNamespaceForQualName(interp, name, NULL, TCL_FIND_ONLY_NS,
&nsPtr, &dummy1Ptr, &dummy2Ptr, &dummy);
/*
* If we found a namespace, then create a new ResolvedNsName structure
* that holds a reference to it.
*/
if ((nsPtr == NULL) || (nsPtr->flags & NS_DYING)) {
/*
* Our failed lookup proves any previously cached nsName intrep is no
* longer valid. Get rid of it so we no longer waste memory storing
* it, nor time determining its invalidity again and again.
*/
if (objPtr->typePtr == &nsNameType) {
TclFreeIntRep(objPtr);
objPtr->typePtr = NULL;
}
return TCL_ERROR;
}
nsPtr->refCount++;
resNamePtr = (ResolvedNsName *) ckalloc(sizeof(ResolvedNsName));
resNamePtr->nsPtr = nsPtr;
if ((name[0] == ':') && (name[1] == ':')) {
resNamePtr->refNsPtr = NULL;
} else {
resNamePtr->refNsPtr = (Namespace *) Tcl_GetCurrentNamespace(interp);
}
resNamePtr->refCount = 1;
TclFreeIntRep(objPtr);
objPtr->internalRep.twoPtrValue.ptr1 = resNamePtr;
objPtr->typePtr = &nsNameType;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NamespaceEnsembleCmd --
*
* Invoked to implement the "namespace ensemble" command that creates and
* manipulates ensembles built on top of namespaces. Handles the
* following syntax:
*
* namespace ensemble name ?dictionary?
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Creates the ensemble for the namespace if one did not previously
* exist. Alternatively, alters the way that the ensemble's subcommand =>
* implementation prefix is configured.
*
*----------------------------------------------------------------------
*/
static int
NamespaceEnsembleCmd(
ClientData dummy,
Tcl_Interp *interp,
int objc,
Tcl_Obj *const objv[])
{
Namespace *nsPtr;
Tcl_Command token;
static const char *subcommands[] = {
"configure", "create", "exists", NULL
};
enum EnsSubcmds {
ENS_CONFIG, ENS_CREATE, ENS_EXISTS
};
static const char *createOptions[] = {
"-command", "-map", "-prefixes", "-subcommands", "-unknown", NULL
};
enum EnsCreateOpts {
CRT_CMD, CRT_MAP, CRT_PREFIX, CRT_SUBCMDS, CRT_UNKNOWN
};
static const char *configOptions[] = {
"-map", "-namespace", "-prefixes", "-subcommands", "-unknown", NULL
};
enum EnsConfigOpts {
CONF_MAP, CONF_NAMESPACE, CONF_PREFIX, CONF_SUBCMDS, CONF_UNKNOWN
};
int index;
nsPtr = (Namespace *) TclGetCurrentNamespace(interp);
if (nsPtr == NULL || nsPtr->flags & NS_DYING) {
if (!Tcl_InterpDeleted(interp)) {
Tcl_AppendResult(interp,
"tried to manipulate ensemble of deleted namespace", NULL);
}
return TCL_ERROR;
}
if (objc < 3) {
Tcl_WrongNumArgs(interp, 2, objv, "subcommand ?arg ...?");
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objv[2], subcommands, "subcommand", 0,
&index) != TCL_OK) {
return TCL_ERROR;
}
switch ((enum EnsSubcmds) index) {
case ENS_CREATE: {
char *name;
Tcl_DictSearch search;
Tcl_Obj *listObj;
int done, len, allocatedMapFlag = 0;
/*
* Defaults
*/
Tcl_Obj *subcmdObj = NULL;
Tcl_Obj *mapObj = NULL;
int permitPrefix = 1;
Tcl_Obj *unknownObj = NULL;
objv += 3;
objc -= 3;
/*
* Work out what name to use for the command to create. If supplied,
* it is either fully specified or relative to the current namespace.
* If not supplied, it is exactly the name of the current namespace.
*/
name = nsPtr->fullName;
/*
* Parse the option list, applying type checks as we go. Note that we
* are not incrementing any reference counts in the objects at this
* stage, so the presence of an option multiple times won't cause any
* memory leaks.
*/
for (; objc>1 ; objc-=2,objv+=2 ) {
if (Tcl_GetIndexFromObj(interp, objv[0], createOptions, "option",
0, &index) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
switch ((enum EnsCreateOpts) index) {
case CRT_CMD:
name = TclGetString(objv[1]);
continue;
case CRT_SUBCMDS:
if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
subcmdObj = (len > 0 ? objv[1] : NULL);
continue;
case CRT_MAP: {
Tcl_Obj *patchedDict = NULL, *subcmdObj;
/*
* Verify that the map is sensible.
*/
if (Tcl_DictObjFirst(interp, objv[1], &search,
&subcmdObj, &listObj, &done) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
if (done) {
mapObj = NULL;
continue;
}
do {
Tcl_Obj **listv;
char *cmd;
if (TclListObjGetElements(interp, listObj, &len,
&listv) != TCL_OK) {
Tcl_DictObjDone(&search);
if (patchedDict) {
Tcl_DecrRefCount(patchedDict);
}
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
if (len < 1) {
Tcl_SetResult(interp,
"ensemble subcommand implementations "
"must be non-empty lists", TCL_STATIC);
Tcl_DictObjDone(&search);
if (patchedDict) {
Tcl_DecrRefCount(patchedDict);
}
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
cmd = TclGetString(listv[0]);
if (!(cmd[0] == ':' && cmd[1] == ':')) {
Tcl_Obj *newList = Tcl_NewListObj(len, listv);
Tcl_Obj *newCmd = Tcl_NewStringObj(nsPtr->fullName,-1);
if (nsPtr->parentPtr) {
Tcl_AppendStringsToObj(newCmd, "::", NULL);
}
Tcl_AppendObjToObj(newCmd, listv[0]);
Tcl_ListObjReplace(NULL, newList, 0, 1, 1, &newCmd);
if (patchedDict == NULL) {
patchedDict = Tcl_DuplicateObj(objv[1]);
}
Tcl_DictObjPut(NULL, patchedDict, subcmdObj, newList);
}
Tcl_DictObjNext(&search, &subcmdObj, &listObj, &done);
} while (!done);
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
mapObj = (patchedDict ? patchedDict : objv[1]);
if (patchedDict) {
allocatedMapFlag = 1;
}
continue;
}
case CRT_PREFIX:
if (Tcl_GetBooleanFromObj(interp, objv[1],
&permitPrefix) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
continue;
case CRT_UNKNOWN:
if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
unknownObj = (len > 0 ? objv[1] : NULL);
continue;
}
}
/*
* Create the ensemble. Note that this might delete another ensemble
* linked to the same namespace, so we must be careful. However, we
* should be OK because we only link the namespace into the list once
* we've created it (and after any deletions have occurred.)
*/
token = Tcl_CreateEnsemble(interp, name, NULL,
(permitPrefix ? TCL_ENSEMBLE_PREFIX : 0));
Tcl_SetEnsembleSubcommandList(interp, token, subcmdObj);
Tcl_SetEnsembleMappingDict(interp, token, mapObj);
Tcl_SetEnsembleUnknownHandler(interp, token, unknownObj);
/*
* Tricky! Must ensure that the result is not shared (command delete
* traces could have corrupted the pristine object that we started
* with). [Snit test rename-1.5]
*/
Tcl_ResetResult(interp);
Tcl_GetCommandFullName(interp, token, Tcl_GetObjResult(interp));
return TCL_OK;
}
case ENS_EXISTS:
if (objc != 4) {
Tcl_WrongNumArgs(interp, 3, objv, "cmdname");
return TCL_ERROR;
}
Tcl_SetObjResult(interp, Tcl_NewBooleanObj(
Tcl_FindEnsemble(interp, objv[3], 0) != NULL));
return TCL_OK;
case ENS_CONFIG:
if (objc < 4 || (objc != 5 && objc & 1)) {
Tcl_WrongNumArgs(interp, 3, objv, "cmdname ?opt? ?value? ...");
return TCL_ERROR;
}
token = Tcl_FindEnsemble(interp, objv[3], TCL_LEAVE_ERR_MSG);
if (token == NULL) {
return TCL_ERROR;
}
if (objc == 5) {
Tcl_Obj *resultObj = NULL; /* silence gcc 4 warning */
if (Tcl_GetIndexFromObj(interp, objv[4], configOptions, "option",
0, &index) != TCL_OK) {
return TCL_ERROR;
}
switch ((enum EnsConfigOpts) index) {
case CONF_SUBCMDS:
Tcl_GetEnsembleSubcommandList(NULL, token, &resultObj);
if (resultObj != NULL) {
Tcl_SetObjResult(interp, resultObj);
}
break;
case CONF_MAP:
Tcl_GetEnsembleMappingDict(NULL, token, &resultObj);
if (resultObj != NULL) {
Tcl_SetObjResult(interp, resultObj);
}
break;
case CONF_NAMESPACE: {
Tcl_Namespace *namespacePtr = NULL; /* silence gcc 4 warning */
Tcl_GetEnsembleNamespace(NULL, token, &namespacePtr);
Tcl_SetResult(interp, ((Namespace *)namespacePtr)->fullName,
TCL_VOLATILE);
break;
}
case CONF_PREFIX: {
int flags = 0; /* silence gcc 4 warning */
Tcl_GetEnsembleFlags(NULL, token, &flags);
Tcl_SetObjResult(interp,
Tcl_NewBooleanObj(flags & TCL_ENSEMBLE_PREFIX));
break;
}
case CONF_UNKNOWN:
Tcl_GetEnsembleUnknownHandler(NULL, token, &resultObj);
if (resultObj != NULL) {
Tcl_SetObjResult(interp, resultObj);
}
break;
}
return TCL_OK;
} else if (objc == 4) {
/*
* Produce list of all information.
*/
Tcl_Obj *resultObj, *tmpObj = NULL; /* silence gcc 4 warning */
Tcl_Namespace *namespacePtr = NULL; /* silence gcc 4 warning */
int flags = 0; /* silence gcc 4 warning */
TclNewObj(resultObj);
/* -map option */
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewStringObj(configOptions[CONF_MAP], -1));
Tcl_GetEnsembleMappingDict(NULL, token, &tmpObj);
Tcl_ListObjAppendElement(NULL, resultObj,
(tmpObj != NULL) ? tmpObj : Tcl_NewObj());
/* -namespace option */
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewStringObj(configOptions[CONF_NAMESPACE], -1));
Tcl_GetEnsembleNamespace(NULL, token, &namespacePtr);
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewStringObj(((Namespace *)namespacePtr)->fullName,
-1));
/* -prefix option */
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewStringObj(configOptions[CONF_PREFIX], -1));
Tcl_GetEnsembleFlags(NULL, token, &flags);
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewBooleanObj(flags & TCL_ENSEMBLE_PREFIX));
/* -subcommands option */
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewStringObj(configOptions[CONF_SUBCMDS], -1));
Tcl_GetEnsembleSubcommandList(NULL, token, &tmpObj);
Tcl_ListObjAppendElement(NULL, resultObj,
(tmpObj != NULL) ? tmpObj : Tcl_NewObj());
/* -unknown option */
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewStringObj(configOptions[CONF_UNKNOWN], -1));
Tcl_GetEnsembleUnknownHandler(NULL, token, &tmpObj);
Tcl_ListObjAppendElement(NULL, resultObj,
(tmpObj != NULL) ? tmpObj : Tcl_NewObj());
Tcl_SetObjResult(interp, resultObj);
return TCL_OK;
} else {
Tcl_DictSearch search;
Tcl_Obj *listObj;
int done, len, allocatedMapFlag = 0;
Tcl_Obj *subcmdObj = NULL, *mapObj = NULL,
*unknownObj = NULL; /* Defaults, silence gcc 4 warnings */
int permitPrefix, flags = 0; /* silence gcc 4 warning */
Tcl_GetEnsembleSubcommandList(NULL, token, &subcmdObj);
Tcl_GetEnsembleMappingDict(NULL, token, &mapObj);
Tcl_GetEnsembleUnknownHandler(NULL, token, &unknownObj);
Tcl_GetEnsembleFlags(NULL, token, &flags);
permitPrefix = (flags & TCL_ENSEMBLE_PREFIX) != 0;
objv += 4;
objc -= 4;
/*
* Parse the option list, applying type checks as we go. Note that
* we are not incrementing any reference counts in the objects at
* this stage, so the presence of an option multiple times won't
* cause any memory leaks.
*/
for (; objc>0 ; objc-=2,objv+=2 ) {
if (Tcl_GetIndexFromObj(interp, objv[0], configOptions,
"option", 0, &index) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
switch ((enum EnsConfigOpts) index) {
case CONF_SUBCMDS:
if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
subcmdObj = (len > 0 ? objv[1] : NULL);
continue;
case CONF_MAP: {
Tcl_Obj *patchedDict = NULL, *subcmdObj;
/*
* Verify that the map is sensible.
*/
if (Tcl_DictObjFirst(interp, objv[1], &search,
&subcmdObj, &listObj, &done) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
if (done) {
mapObj = NULL;
continue;
}
do {
Tcl_Obj **listv;
char *cmd;
if (TclListObjGetElements(interp, listObj, &len,
&listv) != TCL_OK) {
Tcl_DictObjDone(&search);
if (patchedDict) {
Tcl_DecrRefCount(patchedDict);
}
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
if (len < 1) {
Tcl_SetResult(interp,
"ensemble subcommand implementations "
"must be non-empty lists", TCL_STATIC);
Tcl_DictObjDone(&search);
if (patchedDict) {
Tcl_DecrRefCount(patchedDict);
}
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
cmd = TclGetString(listv[0]);
if (!(cmd[0] == ':' && cmd[1] == ':')) {
Tcl_Obj *newList = Tcl_NewListObj(len, listv);
Tcl_Obj *newCmd =
Tcl_NewStringObj(nsPtr->fullName, -1);
if (nsPtr->parentPtr) {
Tcl_AppendStringsToObj(newCmd, "::", NULL);
}
Tcl_AppendObjToObj(newCmd, listv[0]);
Tcl_ListObjReplace(NULL, newList, 0,1, 1,&newCmd);
if (patchedDict == NULL) {
patchedDict = Tcl_DuplicateObj(objv[1]);
}
Tcl_DictObjPut(NULL, patchedDict, subcmdObj,
newList);
}
Tcl_DictObjNext(&search, &subcmdObj, &listObj, &done);
} while (!done);
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
mapObj = (patchedDict ? patchedDict : objv[1]);
if (patchedDict) {
allocatedMapFlag = 1;
}
continue;
}
case CONF_NAMESPACE:
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
Tcl_AppendResult(interp, "option -namespace is read-only",
NULL);
return TCL_ERROR;
case CONF_PREFIX:
if (Tcl_GetBooleanFromObj(interp, objv[1],
&permitPrefix) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
continue;
case CONF_UNKNOWN:
if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
unknownObj = (len > 0 ? objv[1] : NULL);
continue;
}
}
/*
* Update the namespace now that we've finished the parsing stage.
*/
flags = (permitPrefix ? flags|TCL_ENSEMBLE_PREFIX
: flags&~TCL_ENSEMBLE_PREFIX);
Tcl_SetEnsembleSubcommandList(interp, token, subcmdObj);
Tcl_SetEnsembleMappingDict(interp, token, mapObj);
Tcl_SetEnsembleUnknownHandler(interp, token, unknownObj);
Tcl_SetEnsembleFlags(interp, token, flags);
return TCL_OK;
}
default:
Tcl_Panic("unexpected ensemble command");
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_CreateEnsemble --
*
* Create a simple ensemble attached to the given namespace.
*
* Results:
* The token for the command created.
*
* Side effects:
* The ensemble is created and marked for compilation.
*
*----------------------------------------------------------------------
*/
Tcl_Command
Tcl_CreateEnsemble(
Tcl_Interp *interp,
const char *name,
Tcl_Namespace *namespacePtr,
int flags)
{
Namespace *nsPtr = (Namespace *) namespacePtr;
EnsembleConfig *ensemblePtr = (EnsembleConfig *)
ckalloc(sizeof(EnsembleConfig));
Tcl_Obj *nameObj = NULL;
if (nsPtr == NULL) {
nsPtr = (Namespace *) TclGetCurrentNamespace(interp);
}
/*
* Make the name of the ensemble into a fully qualified name. This might
* allocate a temporary object.
*/
if (!(name[0] == ':' && name[1] == ':')) {
nameObj = Tcl_NewStringObj(nsPtr->fullName, -1);
if (nsPtr->parentPtr == NULL) {
Tcl_AppendStringsToObj(nameObj, name, NULL);
} else {
Tcl_AppendStringsToObj(nameObj, "::", name, NULL);
}
Tcl_IncrRefCount(nameObj);
name = TclGetString(nameObj);
}
ensemblePtr->nsPtr = nsPtr;
ensemblePtr->epoch = 0;
Tcl_InitHashTable(&ensemblePtr->subcommandTable, TCL_STRING_KEYS);
ensemblePtr->subcommandArrayPtr = NULL;
ensemblePtr->subcmdList = NULL;
ensemblePtr->subcommandDict = NULL;
ensemblePtr->flags = flags;
ensemblePtr->unknownHandler = NULL;
ensemblePtr->token = Tcl_CreateObjCommand(interp, name,
NsEnsembleImplementationCmd, ensemblePtr, DeleteEnsembleConfig);
ensemblePtr->next = (EnsembleConfig *) nsPtr->ensembles;
nsPtr->ensembles = (Tcl_Ensemble *) ensemblePtr;
/*
* Trigger an eventual recomputation of the ensemble command set. Note
* that this is slightly tricky, as it means that we are not actually
* counting the number of namespace export actions, but it is the simplest
* way to go!
*/
nsPtr->exportLookupEpoch++;
if (flags & ENSEMBLE_COMPILE) {
((Command *) ensemblePtr->token)->compileProc = TclCompileEnsemble;
}
if (nameObj != NULL) {
TclDecrRefCount(nameObj);
}
return ensemblePtr->token;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetEnsembleSubcommandList --
*
* Set the subcommand list for a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an ensemble
* or the subcommand list - if non-NULL - is not a list).
*
* Side effects:
* The ensemble is updated and marked for recompilation.
*
*----------------------------------------------------------------------
*/
int
Tcl_SetEnsembleSubcommandList(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Obj *subcmdList)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
Tcl_Obj *oldList;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
Tcl_AppendResult(interp, "command is not an ensemble", NULL);
return TCL_ERROR;
}
if (subcmdList != NULL) {
int length;
if (TclListObjLength(interp, subcmdList, &length) != TCL_OK) {
return TCL_ERROR;
}
if (length < 1) {
subcmdList = NULL;
}
}
ensemblePtr = cmdPtr->objClientData;
oldList = ensemblePtr->subcmdList;
ensemblePtr->subcmdList = subcmdList;
if (subcmdList != NULL) {
Tcl_IncrRefCount(subcmdList);
}
if (oldList != NULL) {
TclDecrRefCount(oldList);
}
/*
* Trigger an eventual recomputation of the ensemble command set. Note
* that this is slightly tricky, as it means that we are not actually
* counting the number of namespace export actions, but it is the simplest
* way to go!
*/
ensemblePtr->nsPtr->exportLookupEpoch++;
/*
* Special hack to make compiling of [info exists] work when the
* dictionary is modified.
*/
if (cmdPtr->compileProc != NULL) {
((Interp *)interp)->compileEpoch++;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetEnsembleMappingDict --
*
* Set the mapping dictionary for a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an ensemble
* or the mapping - if non-NULL - is not a dict).
*
* Side effects:
* The ensemble is updated and marked for recompilation.
*
*----------------------------------------------------------------------
*/
int
Tcl_SetEnsembleMappingDict(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Obj *mapDict)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
Tcl_Obj *oldDict;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
Tcl_AppendResult(interp, "command is not an ensemble", NULL);
return TCL_ERROR;
}
if (mapDict != NULL) {
int size, done;
Tcl_DictSearch search;
Tcl_Obj *valuePtr;
if (Tcl_DictObjSize(interp, mapDict, &size) != TCL_OK) {
return TCL_ERROR;
}
for (Tcl_DictObjFirst(NULL, mapDict, &search, NULL, &valuePtr, &done);
!done; Tcl_DictObjNext(&search, NULL, &valuePtr, &done)) {
Tcl_Obj *cmdPtr;
const char *bytes;
if (Tcl_ListObjIndex(interp, valuePtr, 0, &cmdPtr) != TCL_OK) {
Tcl_DictObjDone(&search);
return TCL_ERROR;
}
bytes = TclGetString(cmdPtr);
if (bytes[0] != ':' || bytes[1] != ':') {
Tcl_AppendResult(interp,
"ensemble target is not a fully-qualified command",
NULL);
Tcl_DictObjDone(&search);
return TCL_ERROR;
}
}
if (size < 1) {
mapDict = NULL;
}
}
ensemblePtr = cmdPtr->objClientData;
oldDict = ensemblePtr->subcommandDict;
ensemblePtr->subcommandDict = mapDict;
if (mapDict != NULL) {
Tcl_IncrRefCount(mapDict);
}
if (oldDict != NULL) {
TclDecrRefCount(oldDict);
}
/*
* Trigger an eventual recomputation of the ensemble command set. Note
* that this is slightly tricky, as it means that we are not actually
* counting the number of namespace export actions, but it is the simplest
* way to go!
*/
ensemblePtr->nsPtr->exportLookupEpoch++;
/*
* Special hack to make compiling of [info exists] work when the
* dictionary is modified.
*/
if (cmdPtr->compileProc != NULL) {
((Interp *)interp)->compileEpoch++;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetEnsembleUnknownHandler --
*
* Set the unknown handler for a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an ensemble
* or the unknown handler - if non-NULL - is not a list).
*
* Side effects:
* The ensemble is updated and marked for recompilation.
*
*----------------------------------------------------------------------
*/
int
Tcl_SetEnsembleUnknownHandler(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Obj *unknownList)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
Tcl_Obj *oldList;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
Tcl_AppendResult(interp, "command is not an ensemble", NULL);
return TCL_ERROR;
}
if (unknownList != NULL) {
int length;
if (TclListObjLength(interp, unknownList, &length) != TCL_OK) {
return TCL_ERROR;
}
if (length < 1) {
unknownList = NULL;
}
}
ensemblePtr = cmdPtr->objClientData;
oldList = ensemblePtr->unknownHandler;
ensemblePtr->unknownHandler = unknownList;
if (unknownList != NULL) {
Tcl_IncrRefCount(unknownList);
}
if (oldList != NULL) {
TclDecrRefCount(oldList);
}
/*
* Trigger an eventual recomputation of the ensemble command set. Note
* that this is slightly tricky, as it means that we are not actually
* counting the number of namespace export actions, but it is the simplest
* way to go!
*/
ensemblePtr->nsPtr->exportLookupEpoch++;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetEnsembleFlags --
*
* Set the flags for a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an
* ensemble).
*
* Side effects:
* The ensemble is updated and marked for recompilation.
*
*----------------------------------------------------------------------
*/
int
Tcl_SetEnsembleFlags(
Tcl_Interp *interp,
Tcl_Command token,
int flags)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
int wasCompiled;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
Tcl_AppendResult(interp, "command is not an ensemble", NULL);
return TCL_ERROR;
}
ensemblePtr = cmdPtr->objClientData;
wasCompiled = ensemblePtr->flags & ENSEMBLE_COMPILE;
/*
* This API refuses to set the ENS_DEAD flag...
*/
ensemblePtr->flags &= ENS_DEAD;
ensemblePtr->flags |= flags & ~ENS_DEAD;
/*
* Trigger an eventual recomputation of the ensemble command set. Note
* that this is slightly tricky, as it means that we are not actually
* counting the number of namespace export actions, but it is the simplest
* way to go!
*/
ensemblePtr->nsPtr->exportLookupEpoch++;
/*
* If the ENSEMBLE_COMPILE flag status was changed, install or remove the
* compiler function and bump the interpreter's compilation epoch so that
* bytecode gets regenerated.
*/
if (flags & ENSEMBLE_COMPILE) {
if (!wasCompiled) {
((Command*) ensemblePtr->token)->compileProc = TclCompileEnsemble;
((Interp *) interp)->compileEpoch++;
}
} else {
if (wasCompiled) {
((Command*) ensemblePtr->token)->compileProc = NULL;
((Interp *) interp)->compileEpoch++;
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetEnsembleSubcommandList --
*
* Get the list of subcommands associated with a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an
* ensemble). The list of subcommands is returned by updating the
* variable pointed to by the last parameter (NULL if this is to be
* derived from the mapping dictionary or the associated namespace's
* exported commands).
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
int
Tcl_GetEnsembleSubcommandList(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Obj **subcmdListPtr)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
if (interp != NULL) {
Tcl_AppendResult(interp, "command is not an ensemble", NULL);
}
return TCL_ERROR;
}
ensemblePtr = cmdPtr->objClientData;
*subcmdListPtr = ensemblePtr->subcmdList;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetEnsembleMappingDict --
*
* Get the command mapping dictionary associated with a particular
* ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an
* ensemble). The mapping dict is returned by updating the variable
* pointed to by the last parameter (NULL if none is installed).
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
int
Tcl_GetEnsembleMappingDict(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Obj **mapDictPtr)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
if (interp != NULL) {
Tcl_AppendResult(interp, "command is not an ensemble", NULL);
}
return TCL_ERROR;
}
ensemblePtr = cmdPtr->objClientData;
*mapDictPtr = ensemblePtr->subcommandDict;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetEnsembleUnknownHandler --
*
* Get the unknown handler associated with a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an
* ensemble). The unknown handler is returned by updating the variable
* pointed to by the last parameter (NULL if no handler is installed).
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
int
Tcl_GetEnsembleUnknownHandler(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Obj **unknownListPtr)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
if (interp != NULL) {
Tcl_AppendResult(interp, "command is not an ensemble", NULL);
}
return TCL_ERROR;
}
ensemblePtr = cmdPtr->objClientData;
*unknownListPtr = ensemblePtr->unknownHandler;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetEnsembleFlags --
*
* Get the flags for a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an
* ensemble). The flags are returned by updating the variable pointed to
* by the last parameter.
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
int
Tcl_GetEnsembleFlags(
Tcl_Interp *interp,
Tcl_Command token,
int *flagsPtr)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
if (interp != NULL) {
Tcl_AppendResult(interp, "command is not an ensemble", NULL);
}
return TCL_ERROR;
}
ensemblePtr = cmdPtr->objClientData;
*flagsPtr = ensemblePtr->flags;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetEnsembleNamespace --
*
* Get the namespace associated with a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an
* ensemble). Namespace is returned by updating the variable pointed to
* by the last parameter.
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
int
Tcl_GetEnsembleNamespace(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Namespace **namespacePtrPtr)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
if (interp != NULL) {
Tcl_AppendResult(interp, "command is not an ensemble", NULL);
}
return TCL_ERROR;
}
ensemblePtr = cmdPtr->objClientData;
*namespacePtrPtr = (Tcl_Namespace *) ensemblePtr->nsPtr;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_FindEnsemble --
*
* Given a command name, get the ensemble token for it, allowing for
* [namespace import]s. [Bug 1017022]
*
* Results:
* The token for the ensemble command with the given name, or NULL if the
* command either does not exist or is not an ensemble (when an error
* message will be written into the interp if thats non-NULL).
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
Tcl_Command
Tcl_FindEnsemble(
Tcl_Interp *interp, /* Where to do the lookup, and where to write
* the errors if TCL_LEAVE_ERR_MSG is set in
* the flags. */
Tcl_Obj *cmdNameObj, /* Name of command to look up. */
int flags) /* Either 0 or TCL_LEAVE_ERR_MSG; other flags
* are probably not useful. */
{
Command *cmdPtr;
cmdPtr = (Command *)
Tcl_FindCommand(interp, TclGetString(cmdNameObj), NULL, flags);
if (cmdPtr == NULL) {
return NULL;
}
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
/*
* Reuse existing infrastructure for following import link chains
* rather than duplicating it.
*/
cmdPtr = (Command *) TclGetOriginalCommand((Tcl_Command) cmdPtr);
if (cmdPtr == NULL || cmdPtr->objProc != NsEnsembleImplementationCmd) {
if (flags & TCL_LEAVE_ERR_MSG) {
Tcl_AppendResult(interp, "\"", TclGetString(cmdNameObj),
"\" is not an ensemble command", NULL);
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ENSEMBLE",
TclGetString(cmdNameObj), NULL);
}
return NULL;
}
}
return (Tcl_Command) cmdPtr;
}
/*
*----------------------------------------------------------------------
*
* Tcl_IsEnsemble --
*
* Simple test for ensemble-hood that takes into account imported
* ensemble commands as well.
*
* Results:
* Boolean value
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
int
Tcl_IsEnsemble(
Tcl_Command token)
{
Command *cmdPtr = (Command *) token;
if (cmdPtr->objProc == NsEnsembleImplementationCmd) {
return 1;
}
cmdPtr = (Command *) TclGetOriginalCommand((Tcl_Command) cmdPtr);
if (cmdPtr == NULL || cmdPtr->objProc != NsEnsembleImplementationCmd) {
return 0;
}
return 1;
}
/*
*----------------------------------------------------------------------
*
* TclMakeEnsemble --
*
* Create an ensemble from a table of implementation commands. The
* ensemble will be subject to (limited) compilation if any of the
* implementation commands are compilable.
*
* Results:
* Handle for the ensemble, or NULL if creation of it fails.
*
* Side effects:
* May advance bytecode compilation epoch.
*
*----------------------------------------------------------------------
*/
Tcl_Command
TclMakeEnsemble(
Tcl_Interp *interp,
const char *name,
const EnsembleImplMap map[])
{
Tcl_Command ensemble; /* The overall ensemble. */
Tcl_Namespace *tclNsPtr; /* Reference to the "::tcl" namespace. */
Tcl_DString buf;
tclNsPtr = Tcl_FindNamespace(interp, "::tcl", NULL,
TCL_CREATE_NS_IF_UNKNOWN);
if (tclNsPtr == NULL) {
Tcl_Panic("unable to find or create ::tcl namespace!");
}
Tcl_DStringInit(&buf);
Tcl_DStringAppend(&buf, "::tcl::", -1);
Tcl_DStringAppend(&buf, name, -1);
tclNsPtr = Tcl_FindNamespace(interp, Tcl_DStringValue(&buf), NULL,
TCL_CREATE_NS_IF_UNKNOWN);
if (tclNsPtr == NULL) {
Tcl_Panic("unable to find or create %s namespace!",
Tcl_DStringValue(&buf));
}
ensemble = Tcl_CreateEnsemble(interp, Tcl_DStringValue(&buf)+5, tclNsPtr,
TCL_ENSEMBLE_PREFIX);
Tcl_DStringAppend(&buf, "::", -1);
if (ensemble != NULL) {
Tcl_Obj *mapDict;
int i, compile = 0;
TclNewObj(mapDict);
for (i=0 ; map[i].name != NULL ; i++) {
Tcl_Obj *fromObj, *toObj;
Command *cmdPtr;
fromObj = Tcl_NewStringObj(map[i].name, -1);
TclNewStringObj(toObj, Tcl_DStringValue(&buf),
Tcl_DStringLength(&buf));
Tcl_AppendToObj(toObj, map[i].name, -1);
Tcl_DictObjPut(NULL, mapDict, fromObj, toObj);
cmdPtr = (Command *) Tcl_CreateObjCommand(interp,
TclGetString(toObj), map[i].proc, NULL, NULL);
cmdPtr->compileProc = map[i].compileProc;
compile |= (map[i].compileProc != NULL);
}
Tcl_SetEnsembleMappingDict(interp, ensemble, mapDict);
if (compile) {
Tcl_SetEnsembleFlags(interp, ensemble,
TCL_ENSEMBLE_PREFIX | ENSEMBLE_COMPILE);
}
}
Tcl_DStringFree(&buf);
return ensemble;
}
/*
*----------------------------------------------------------------------
*
* NsEnsembleImplementationCmd --
*
* Implements an ensemble of commands (being those exported by a
* namespace other than the global namespace) as a command with the same
* (short) name as the namespace in the parent namespace.
*
* Results:
* A standard Tcl result code. Will be TCL_ERROR if the command is not an
* unambiguous prefix of any command exported by the ensemble's
* namespace.
*
* Side effects:
* Depends on the command within the namespace that gets executed. If the
* ensemble itself returns TCL_ERROR, a descriptive error message will be
* placed in the interpreter's result.
*
*----------------------------------------------------------------------
*/
static int
NsEnsembleImplementationCmd(
ClientData clientData,
Tcl_Interp *interp,
int objc,
Tcl_Obj *const objv[])
{
EnsembleConfig *ensemblePtr = clientData;
/* The ensemble itself. */
Tcl_Obj **tempObjv; /* Space used to construct the list of
* arguments to pass to the command that
* implements the ensemble subcommand. */
int result; /* The result of the subcommand execution. */
Tcl_Obj *prefixObj; /* An object containing the prefix words of
* the command that implements the
* subcommand. */
Tcl_HashEntry *hPtr; /* Used for efficient lookup of fully
* specified but not yet cached command
* names. */
Tcl_Obj **prefixObjv; /* The list of objects to substitute in as the
* target command prefix. */
int prefixObjc; /* Size of prefixObjv of course! */
int reparseCount = 0; /* Number of reparses. */
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "subcommand ?argument ...?");
return TCL_ERROR;
}
restartEnsembleParse:
if (ensemblePtr->nsPtr->flags & NS_DYING) {
/*
* Don't know how we got here, but make things give up quickly.
*/
if (!Tcl_InterpDeleted(interp)) {
Tcl_AppendResult(interp,
"ensemble activated for deleted namespace", NULL);
}
return TCL_ERROR;
}
/*
* Determine if the table of subcommands is right. If so, we can just look
* up in there and go straight to dispatch.
*/
if (ensemblePtr->epoch == ensemblePtr->nsPtr->exportLookupEpoch) {
/*
* Table of subcommands is still valid; therefore there might be a
* valid cache of discovered information which we can reuse. Do the
* check here, and if we're still valid, we can jump straight to the
* part where we do the invocation of the subcommand.
*/
if (objv[1]->typePtr == &tclEnsembleCmdType) {
EnsembleCmdRep *ensembleCmd = objv[1]->internalRep.otherValuePtr;
if (ensembleCmd->nsPtr == ensemblePtr->nsPtr &&
ensembleCmd->epoch == ensemblePtr->epoch &&
ensembleCmd->token == ensemblePtr->token) {
prefixObj = ensembleCmd->realPrefixObj;
Tcl_IncrRefCount(prefixObj);
goto runResultingSubcommand;
}
}
} else {
BuildEnsembleConfig(ensemblePtr);
ensemblePtr->epoch = ensemblePtr->nsPtr->exportLookupEpoch;
}
/*
* Look in the hashtable for the subcommand name; this is the fastest way
* of all.
*/
hPtr = Tcl_FindHashEntry(&ensemblePtr->subcommandTable,
TclGetString(objv[1]));
if (hPtr != NULL) {
char *fullName = Tcl_GetHashKey(&ensemblePtr->subcommandTable, hPtr);
prefixObj = Tcl_GetHashValue(hPtr);
/*
* Cache for later in the subcommand object.
*/
MakeCachedEnsembleCommand(objv[1], ensemblePtr, fullName, prefixObj);
} else if (!(ensemblePtr->flags & TCL_ENSEMBLE_PREFIX)) {
/*
* Could not map, no prefixing, go to unknown/error handling.
*/
goto unknownOrAmbiguousSubcommand;
} else {
/*
* If we've not already confirmed the command with the hash as part of
* building our export table, we need to scan the sorted array for
* matches.
*/
char *subcmdName; /* Name of the subcommand, or unique prefix of
* it (will be an error for a non-unique
* prefix). */
char *fullName = NULL; /* Full name of the subcommand. */
int stringLength, i;
int tableLength = ensemblePtr->subcommandTable.numEntries;
subcmdName = TclGetString(objv[1]);
stringLength = objv[1]->length;
for (i=0 ; i<tableLength ; i++) {
register int cmp = strncmp(subcmdName,
ensemblePtr->subcommandArrayPtr[i],
(unsigned) stringLength);
if (cmp == 0) {
if (fullName != NULL) {
/*
* Since there's never the exact-match case to worry about
* (hash search filters this), getting here indicates that
* our subcommand is an ambiguous prefix of (at least) two
* exported subcommands, which is an error case.
*/
goto unknownOrAmbiguousSubcommand;
}
fullName = ensemblePtr->subcommandArrayPtr[i];
} else if (cmp < 0) {
/*
* Because we are searching a sorted table, we can now stop
* searching because we have gone past anything that could
* possibly match.
*/
break;
}
}
if (fullName == NULL) {
/*
* The subcommand is not a prefix of anything, so bail out!
*/
goto unknownOrAmbiguousSubcommand;
}
hPtr = Tcl_FindHashEntry(&ensemblePtr->subcommandTable, fullName);
if (hPtr == NULL) {
Tcl_Panic("full name %s not found in supposedly synchronized hash",
fullName);
}
prefixObj = Tcl_GetHashValue(hPtr);
/*
* Cache for later in the subcommand object.
*/
MakeCachedEnsembleCommand(objv[1], ensemblePtr, fullName, prefixObj);
}
Tcl_IncrRefCount(prefixObj);
runResultingSubcommand:
/*
* Do the real work of execution of the subcommand by building an array of
* objects (note that this is potentially not the same length as the
* number of arguments to this ensemble command), populating it and then
* feeding it back through the main command-lookup engine. In theory, we
* could look up the command in the namespace ourselves, as we already
* have the namespace in which it is guaranteed to exist, but we don't do
* that (the cacheing of the command object used should help with that.)
*/
{
Interp *iPtr = (Interp *) interp;
int isRootEnsemble;
Tcl_Obj *copyObj;
/*
* Get the prefix that we're rewriting to. To do this we need to
* ensure that the internal representation of the list does not change
* so that we can safely keep the internal representations of the
* elements in the list.
*/
copyObj = TclListObjCopy(NULL, prefixObj);
TclListObjGetElements(NULL, copyObj, &prefixObjc, &prefixObjv);
/*
* Record what arguments the script sent in so that things like
* Tcl_WrongNumArgs can give the correct error message.
*/
isRootEnsemble = (iPtr->ensembleRewrite.sourceObjs == NULL);
if (isRootEnsemble) {
iPtr->ensembleRewrite.sourceObjs = objv;
iPtr->ensembleRewrite.numRemovedObjs = 2;
iPtr->ensembleRewrite.numInsertedObjs = prefixObjc;
} else {
int ni = iPtr->ensembleRewrite.numInsertedObjs;
if (ni < 2) {
iPtr->ensembleRewrite.numRemovedObjs += 2 - ni;
iPtr->ensembleRewrite.numInsertedObjs += prefixObjc-1;
} else {
iPtr->ensembleRewrite.numInsertedObjs += prefixObjc-2;
}
}
/*
* Allocate a workspace and build the list of arguments to pass to the
* target command in it.
*/
tempObjv = (Tcl_Obj **) TclStackAlloc(interp,
(int) sizeof(Tcl_Obj *) * (objc - 2 + prefixObjc));
memcpy(tempObjv, prefixObjv, sizeof(Tcl_Obj *) * prefixObjc);
memcpy(tempObjv+prefixObjc, objv+2, sizeof(Tcl_Obj *) * (objc-2));
/*
* Hand off to the target command.
*/
result = Tcl_EvalObjv(interp, objc-2+prefixObjc, tempObjv,
TCL_EVAL_INVOKE);
/*
* Clean up.
*/
TclStackFree(interp, tempObjv);
Tcl_DecrRefCount(copyObj);
if (isRootEnsemble) {
iPtr->ensembleRewrite.sourceObjs = NULL;
iPtr->ensembleRewrite.numRemovedObjs = 0;
iPtr->ensembleRewrite.numInsertedObjs = 0;
}
}
Tcl_DecrRefCount(prefixObj);
return result;
unknownOrAmbiguousSubcommand:
/*
* Have not been able to match the subcommand asked for with a real
* subcommand that we export. See whether a handler has been registered
* for dealing with this situation. Will only call (at most) once for any
* particular ensemble invocation.
*/
if (ensemblePtr->unknownHandler != NULL && reparseCount++ < 1) {
int paramc, i;
Tcl_Obj **paramv, *unknownCmd, *ensObj;
unknownCmd = Tcl_DuplicateObj(ensemblePtr->unknownHandler);
TclNewObj(ensObj);
Tcl_GetCommandFullName(interp, ensemblePtr->token, ensObj);
Tcl_ListObjAppendElement(NULL, unknownCmd, ensObj);
for (i=1 ; i<objc ; i++) {
Tcl_ListObjAppendElement(NULL, unknownCmd, objv[i]);
}
TclListObjGetElements(NULL, unknownCmd, ¶mc, ¶mv);
Tcl_Preserve(ensemblePtr);
Tcl_IncrRefCount(unknownCmd);
result = Tcl_EvalObjv(interp, paramc, paramv, 0);
if (result == TCL_OK) {
prefixObj = Tcl_GetObjResult(interp);
Tcl_IncrRefCount(prefixObj);
Tcl_DecrRefCount(unknownCmd);
Tcl_Release(ensemblePtr);
Tcl_ResetResult(interp);
if (ensemblePtr->flags & ENS_DEAD) {
Tcl_DecrRefCount(prefixObj);
Tcl_SetResult(interp,
"unknown subcommand handler deleted its ensemble",
TCL_STATIC);
return TCL_ERROR;
}
/*
* Namespace is still there. Check if the result is a valid list.
* If it is, and it is non-empty, that list is what we are using
* as our replacement.
*/
if (TclListObjLength(interp, prefixObj, &prefixObjc) != TCL_OK) {
Tcl_DecrRefCount(prefixObj);
Tcl_AddErrorInfo(interp, "\n while parsing result of "
"ensemble unknown subcommand handler");
return TCL_ERROR;
}
if (prefixObjc > 0) {
goto runResultingSubcommand;
}
/*
* Namespace alive & empty result => reparse.
*/
Tcl_DecrRefCount(prefixObj);
goto restartEnsembleParse;
}
if (!Tcl_InterpDeleted(interp)) {
if (result != TCL_ERROR) {
char buf[TCL_INTEGER_SPACE];
Tcl_ResetResult(interp);
Tcl_SetResult(interp,
"unknown subcommand handler returned bad code: ",
TCL_STATIC);
switch (result) {
case TCL_RETURN:
Tcl_AppendResult(interp, "return", NULL);
break;
case TCL_BREAK:
Tcl_AppendResult(interp, "break", NULL);
break;
case TCL_CONTINUE:
Tcl_AppendResult(interp, "continue", NULL);
break;
default:
sprintf(buf, "%d", result);
Tcl_AppendResult(interp, buf, NULL);
}
Tcl_AddErrorInfo(interp, "\n result of "
"ensemble unknown subcommand handler: ");
Tcl_AddErrorInfo(interp, TclGetString(unknownCmd));
} else {
Tcl_AddErrorInfo(interp,
"\n (ensemble unknown subcommand handler)");
}
}
Tcl_DecrRefCount(unknownCmd);
Tcl_Release(ensemblePtr);
return TCL_ERROR;
}
/*
* We cannot determine what subcommand to hand off to, so generate a
* (standard) failure message. Note the one odd case compared with
* standard ensemble-like command, which is where a namespace has no
* exported commands at all...
*/
Tcl_ResetResult(interp);
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ENSEMBLE",
TclGetString(objv[1]), NULL);
if (ensemblePtr->subcommandTable.numEntries == 0) {
Tcl_AppendResult(interp, "unknown subcommand \"",TclGetString(objv[1]),
"\": namespace ", ensemblePtr->nsPtr->fullName,
" does not export any commands", NULL);
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "SUBCOMMAND",
TclGetString(objv[1]), NULL);
return TCL_ERROR;
}
Tcl_AppendResult(interp, "unknown ",
(ensemblePtr->flags & TCL_ENSEMBLE_PREFIX ? "or ambiguous " : ""),
"subcommand \"", TclGetString(objv[1]), "\": must be ", NULL);
if (ensemblePtr->subcommandTable.numEntries == 1) {
Tcl_AppendResult(interp, ensemblePtr->subcommandArrayPtr[0], NULL);
} else {
int i;
for (i=0 ; i<ensemblePtr->subcommandTable.numEntries-1 ; i++) {
Tcl_AppendResult(interp,
ensemblePtr->subcommandArrayPtr[i], ", ", NULL);
}
Tcl_AppendResult(interp, "or ",
ensemblePtr->subcommandArrayPtr[i], NULL);
}
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "SUBCOMMAND",
TclGetString(objv[1]), NULL);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* MakeCachedEnsembleCommand --
*
* Cache what we've computed so far; it's not nice to repeatedly copy
* strings about. Note that to do this, we start by deleting any old
* representation that there was (though if it was an out of date
* ensemble rep, we can skip some of the deallocation process.)
*
* Results:
* None
*
* Side effects:
* Alters the internal representation of the first object parameter.
*
*----------------------------------------------------------------------
*/
static void
MakeCachedEnsembleCommand(
Tcl_Obj *objPtr,
EnsembleConfig *ensemblePtr,
const char *subcommandName,
Tcl_Obj *prefixObjPtr)
{
register EnsembleCmdRep *ensembleCmd;
int length;
if (objPtr->typePtr == &tclEnsembleCmdType) {
ensembleCmd = objPtr->internalRep.otherValuePtr;
Tcl_DecrRefCount(ensembleCmd->realPrefixObj);
ensembleCmd->nsPtr->refCount--;
if ((ensembleCmd->nsPtr->refCount == 0)
&& (ensembleCmd->nsPtr->flags & NS_DEAD)) {
NamespaceFree(ensembleCmd->nsPtr);
}
ckfree(ensembleCmd->fullSubcmdName);
} else {
/*
* Kill the old internal rep, and replace it with a brand new one of
* our own.
*/
TclFreeIntRep(objPtr);
ensembleCmd = (EnsembleCmdRep *) ckalloc(sizeof(EnsembleCmdRep));
objPtr->internalRep.otherValuePtr = ensembleCmd;
objPtr->typePtr = &tclEnsembleCmdType;
}
/*
* Populate the internal rep.
*/
ensembleCmd->nsPtr = ensemblePtr->nsPtr;
ensembleCmd->epoch = ensemblePtr->epoch;
ensembleCmd->token = ensemblePtr->token;
ensemblePtr->nsPtr->refCount++;
ensembleCmd->realPrefixObj = prefixObjPtr;
length = strlen(subcommandName)+1;
ensembleCmd->fullSubcmdName = ckalloc((unsigned) length);
memcpy(ensembleCmd->fullSubcmdName, subcommandName, (unsigned) length);
Tcl_IncrRefCount(ensembleCmd->realPrefixObj);
}
/*
*----------------------------------------------------------------------
*
* DeleteEnsembleConfig --
*
* Destroys the data structure used to represent an ensemble. This is
* called when the ensemble's command is deleted (which happens
* automatically if the ensemble's namespace is deleted.) Maintainers
* should note that ensembles should be deleted by deleting their
* commands.
*
* Results:
* None.
*
* Side effects:
* Memory is (eventually) deallocated.
*
*----------------------------------------------------------------------
*/
static void
DeleteEnsembleConfig(
ClientData clientData)
{
EnsembleConfig *ensemblePtr = clientData;
Namespace *nsPtr = ensemblePtr->nsPtr;
Tcl_HashSearch search;
Tcl_HashEntry *hEnt;
/*
* Unlink from the ensemble chain if it has not been marked as having been
* done already.
*/
if (ensemblePtr->next != ensemblePtr) {
EnsembleConfig *ensPtr = (EnsembleConfig *) nsPtr->ensembles;
if (ensPtr == ensemblePtr) {
nsPtr->ensembles = (Tcl_Ensemble *) ensemblePtr->next;
} else {
while (ensPtr != NULL) {
if (ensPtr->next == ensemblePtr) {
ensPtr->next = ensemblePtr->next;
break;
}
ensPtr = ensPtr->next;
}
}
}
/*
* Mark the namespace as dead so code that uses Tcl_Preserve() can tell
* whether disaster happened anyway.
*/
ensemblePtr->flags |= ENS_DEAD;
/*
* Kill the pointer-containing fields.
*/
if (ensemblePtr->subcommandTable.numEntries != 0) {
ckfree((char *) ensemblePtr->subcommandArrayPtr);
}
hEnt = Tcl_FirstHashEntry(&ensemblePtr->subcommandTable, &search);
while (hEnt != NULL) {
Tcl_Obj *prefixObj = Tcl_GetHashValue(hEnt);
Tcl_DecrRefCount(prefixObj);
hEnt = Tcl_NextHashEntry(&search);
}
Tcl_DeleteHashTable(&ensemblePtr->subcommandTable);
if (ensemblePtr->subcmdList != NULL) {
Tcl_DecrRefCount(ensemblePtr->subcmdList);
}
if (ensemblePtr->subcommandDict != NULL) {
Tcl_DecrRefCount(ensemblePtr->subcommandDict);
}
if (ensemblePtr->unknownHandler != NULL) {
Tcl_DecrRefCount(ensemblePtr->unknownHandler);
}
/*
* Arrange for the structure to be reclaimed. Note that this is complex
* because we have to make sure that we can react sensibly when an
* ensemble is deleted during the process of initialising the ensemble
* (especially the unknown callback.)
*/
Tcl_EventuallyFree(ensemblePtr, TCL_DYNAMIC);
}
/*
*----------------------------------------------------------------------
*
* BuildEnsembleConfig --
*
* Create the internal data structures that describe how an ensemble
* looks, being a hash mapping from the full command name to the Tcl list
* that describes the implementation prefix words, and a sorted array of
* all the full command names to allow for reasonably efficient
* unambiguous prefix handling.
*
* Results:
* None.
*
* Side effects:
* Reallocates and rebuilds the hash table and array stored at the
* ensemblePtr argument. For large ensembles or large namespaces, this is
* a potentially expensive operation.
*
*----------------------------------------------------------------------
*/
static void
BuildEnsembleConfig(
EnsembleConfig *ensemblePtr)
{
Tcl_HashSearch search; /* Used for scanning the set of commands in
* the namespace that backs up this
* ensemble. */
int i, j, isNew;
Tcl_HashTable *hash = &ensemblePtr->subcommandTable;
Tcl_HashEntry *hPtr;
if (hash->numEntries != 0) {
/*
* Remove pre-existing table.
*/
Tcl_HashSearch search;
ckfree((char *) ensemblePtr->subcommandArrayPtr);
hPtr = Tcl_FirstHashEntry(hash, &search);
while (hPtr != NULL) {
Tcl_Obj *prefixObj = Tcl_GetHashValue(hPtr);
Tcl_DecrRefCount(prefixObj);
hPtr = Tcl_NextHashEntry(&search);
}
Tcl_DeleteHashTable(hash);
Tcl_InitHashTable(hash, TCL_STRING_KEYS);
}
/*
* See if we've got an export list. If so, we will only export exactly
* those commands, which may be either implemented by the prefix in the
* subcommandDict or mapped directly onto the namespace's commands.
*/
if (ensemblePtr->subcmdList != NULL) {
Tcl_Obj **subcmdv, *target, *cmdObj, *cmdPrefixObj;
int subcmdc;
TclListObjGetElements(NULL, ensemblePtr->subcmdList, &subcmdc,
&subcmdv);
for (i=0 ; i<subcmdc ; i++) {
char *name = TclGetString(subcmdv[i]);
hPtr = Tcl_CreateHashEntry(hash, name, &isNew);
/*
* Skip non-unique cases.
*/
if (!isNew) {
continue;
}
/*
* Look in our dictionary (if present) for the command.
*/
if (ensemblePtr->subcommandDict != NULL) {
Tcl_DictObjGet(NULL, ensemblePtr->subcommandDict, subcmdv[i],
&target);
if (target != NULL) {
Tcl_SetHashValue(hPtr, target);
Tcl_IncrRefCount(target);
continue;
}
}
/*
* Not there, so map onto the namespace. Note in this case that we
* do not guarantee that the command is actually there; that is
* the programmer's responsibility (or [::unknown] of course).
*/
cmdObj = Tcl_NewStringObj(ensemblePtr->nsPtr->fullName, -1);
if (ensemblePtr->nsPtr->parentPtr != NULL) {
Tcl_AppendStringsToObj(cmdObj, "::", name, NULL);
} else {
Tcl_AppendStringsToObj(cmdObj, name, NULL);
}
cmdPrefixObj = Tcl_NewListObj(1, &cmdObj);
Tcl_SetHashValue(hPtr, cmdPrefixObj);
Tcl_IncrRefCount(cmdPrefixObj);
}
} else if (ensemblePtr->subcommandDict != NULL) {
/*
* No subcmd list, but we do have a mapping dictionary so we should
* use the keys of that. Convert the dictionary's contents into the
* form required for the ensemble's internal hashtable.
*/
Tcl_DictSearch dictSearch;
Tcl_Obj *keyObj, *valueObj;
int done;
Tcl_DictObjFirst(NULL, ensemblePtr->subcommandDict, &dictSearch,
&keyObj, &valueObj, &done);
while (!done) {
char *name = TclGetString(keyObj);
hPtr = Tcl_CreateHashEntry(hash, name, &isNew);
Tcl_SetHashValue(hPtr, valueObj);
Tcl_IncrRefCount(valueObj);
Tcl_DictObjNext(&dictSearch, &keyObj, &valueObj, &done);
}
} else {
/*
* Discover what commands are actually exported by the namespace.
* What we have is an array of patterns and a hash table whose keys
* are the command names exported by the namespace (the contents do
* not matter here.) We must find out what commands are actually
* exported by filtering each command in the namespace against each of
* the patterns in the export list. Note that we use an intermediate
* hash table to make memory management easier, and because that makes
* exact matching far easier too.
*
* Suggestion for future enhancement: compute the unique prefixes and
* place them in the hash too, which should make for even faster
* matching.
*/
hPtr = Tcl_FirstHashEntry(&ensemblePtr->nsPtr->cmdTable, &search);
for (; hPtr!= NULL ; hPtr=Tcl_NextHashEntry(&search)) {
char *nsCmdName = /* Name of command in namespace. */
Tcl_GetHashKey(&ensemblePtr->nsPtr->cmdTable, hPtr);
for (i=0 ; i<ensemblePtr->nsPtr->numExportPatterns ; i++) {
if (Tcl_StringMatch(nsCmdName,
ensemblePtr->nsPtr->exportArrayPtr[i])) {
hPtr = Tcl_CreateHashEntry(hash, nsCmdName, &isNew);
/*
* Remember, hash entries have a full reference to the
* substituted part of the command (as a list) as their
* content!
*/
if (isNew) {
Tcl_Obj *cmdObj, *cmdPrefixObj;
TclNewObj(cmdObj);
Tcl_AppendStringsToObj(cmdObj,
ensemblePtr->nsPtr->fullName,
(ensemblePtr->nsPtr->parentPtr ? "::" : ""),
nsCmdName, NULL);
cmdPrefixObj = Tcl_NewListObj(1, &cmdObj);
Tcl_SetHashValue(hPtr, cmdPrefixObj);
Tcl_IncrRefCount(cmdPrefixObj);
}
break;
}
}
}
}
if (hash->numEntries == 0) {
ensemblePtr->subcommandArrayPtr = NULL;
return;
}
/*
* Create a sorted array of all subcommands in the ensemble; hash tables
* are all very well for a quick look for an exact match, but they can't
* determine things like whether a string is a prefix of another (not
* without lots of preparation anyway) and they're no good for when we're
* generating the error message either.
*
* We do this by filling an array with the names (we use the hash keys
* directly to save a copy, since any time we change the array we change
* the hash too, and vice versa) and running quicksort over the array.
*/
ensemblePtr->subcommandArrayPtr = (char **)
ckalloc(sizeof(char *) * hash->numEntries);
/*
* Fill array from both ends as this makes us less likely to end up with
* performance problems in qsort(), which is good. Note that doing this
* makes this code much more opaque, but the naive alternatve:
*
* for (hPtr=Tcl_FirstHashEntry(hash,&search),i=0 ;
* hPtr!=NULL ; hPtr=Tcl_NextHashEntry(&search),i++) {
* ensemblePtr->subcommandArrayPtr[i] = Tcl_GetHashKey(hash, &hPtr);
* }
*
* can produce long runs of precisely ordered table entries when the
* commands in the namespace are declared in a sorted fashion (an ordering
* some people like) and the hashing functions (or the command names
* themselves) are fairly unfortunate. By filling from both ends, it
* requires active malice (and probably a debugger) to get qsort() to have
* awful runtime behaviour.
*/
i = 0;
j = hash->numEntries;
hPtr = Tcl_FirstHashEntry(hash, &search);
while (hPtr != NULL) {
ensemblePtr->subcommandArrayPtr[i++] = Tcl_GetHashKey(hash, hPtr);
hPtr = Tcl_NextHashEntry(&search);
if (hPtr == NULL) {
break;
}
ensemblePtr->subcommandArrayPtr[--j] = Tcl_GetHashKey(hash, hPtr);
hPtr = Tcl_NextHashEntry(&search);
}
if (hash->numEntries > 1) {
qsort(ensemblePtr->subcommandArrayPtr, (unsigned)hash->numEntries,
sizeof(char *), NsEnsembleStringOrder);
}
}
/*
*----------------------------------------------------------------------
*
* NsEnsembleStringOrder --
*
* Helper function to compare two pointers to two strings for use with
* qsort().
*
* Results:
* -1 if the first string is smaller, 1 if the second string is smaller,
* and 0 if they are equal.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
NsEnsembleStringOrder(
const void *strPtr1,
const void *strPtr2)
{
return strcmp(*(const char **)strPtr1, *(const char **)strPtr2);
}
/*
*----------------------------------------------------------------------
*
* FreeEnsembleCmdRep --
*
* Destroys the internal representation of a Tcl_Obj that has been
* holding information about a command in an ensemble.
*
* Results:
* None.
*
* Side effects:
* Memory is deallocated. If this held the last reference to a
* namespace's main structure, that main structure will also be
* destroyed.
*
*----------------------------------------------------------------------
*/
static void
FreeEnsembleCmdRep(
Tcl_Obj *objPtr)
{
EnsembleCmdRep *ensembleCmd = objPtr->internalRep.otherValuePtr;
Tcl_DecrRefCount(ensembleCmd->realPrefixObj);
ckfree(ensembleCmd->fullSubcmdName);
ensembleCmd->nsPtr->refCount--;
if ((ensembleCmd->nsPtr->refCount == 0)
&& (ensembleCmd->nsPtr->flags & NS_DEAD)) {
NamespaceFree(ensembleCmd->nsPtr);
}
ckfree((char *) ensembleCmd);
}
/*
*----------------------------------------------------------------------
*
* DupEnsembleCmdRep --
*
* Makes one Tcl_Obj into a copy of another that is a subcommand of an
* ensemble.
*
* Results:
* None.
*
* Side effects:
* Memory is allocated, and the namespace that the ensemble is built on
* top of gains another reference.
*
*----------------------------------------------------------------------
*/
static void
DupEnsembleCmdRep(
Tcl_Obj *objPtr,
Tcl_Obj *copyPtr)
{
EnsembleCmdRep *ensembleCmd = objPtr->internalRep.otherValuePtr;
EnsembleCmdRep *ensembleCopy = (EnsembleCmdRep *)
ckalloc(sizeof(EnsembleCmdRep));
int length = strlen(ensembleCmd->fullSubcmdName);
copyPtr->typePtr = &tclEnsembleCmdType;
copyPtr->internalRep.otherValuePtr = ensembleCopy;
ensembleCopy->nsPtr = ensembleCmd->nsPtr;
ensembleCopy->epoch = ensembleCmd->epoch;
ensembleCopy->token = ensembleCmd->token;
ensembleCopy->nsPtr->refCount++;
ensembleCopy->realPrefixObj = ensembleCmd->realPrefixObj;
Tcl_IncrRefCount(ensembleCopy->realPrefixObj);
ensembleCopy->fullSubcmdName = ckalloc((unsigned) length+1);
memcpy(ensembleCopy->fullSubcmdName, ensembleCmd->fullSubcmdName,
(unsigned) length+1);
}
/*
*----------------------------------------------------------------------
*
* StringOfEnsembleCmdRep --
*
* Creates a string representation of a Tcl_Obj that holds a subcommand
* of an ensemble.
*
* Results:
* None.
*
* Side effects:
* The object gains a string (UTF-8) representation.
*
*----------------------------------------------------------------------
*/
static void
StringOfEnsembleCmdRep(
Tcl_Obj *objPtr)
{
EnsembleCmdRep *ensembleCmd = objPtr->internalRep.otherValuePtr;
int length = strlen(ensembleCmd->fullSubcmdName);
objPtr->length = length;
objPtr->bytes = ckalloc((unsigned) length+1);
memcpy(objPtr->bytes, ensembleCmd->fullSubcmdName, (unsigned) length+1);
}
/*
*----------------------------------------------------------------------
*
* Tcl_LogCommandInfo --
*
* This function is invoked after an error occurs in an interpreter. It
* adds information to iPtr->errorInfo field to describe the command that
* was being executed when the error occurred.
*
* Results:
* None.
*
* Side effects:
* Information about the command is added to errorInfo and the line
* number stored internally in the interpreter is set.
*
*----------------------------------------------------------------------
*/
void
Tcl_LogCommandInfo(
Tcl_Interp *interp, /* Interpreter in which to log information. */
const char *script, /* First character in script containing
* command (must be <= command). */
const char *command, /* First character in command that generated
* the error. */
int length) /* Number of bytes in command (-1 means use
* all bytes up to first null byte). */
{
register const char *p;
Interp *iPtr = (Interp *) interp;
int overflow, limit = 150;
Var *varPtr, *arrayPtr;
if (iPtr->flags & ERR_ALREADY_LOGGED) {
/*
* Someone else has already logged error information for this command;
* we shouldn't add anything more.
*/
return;
}
/*
* Compute the line number where the error occurred.
*/
iPtr->errorLine = 1;
for (p = script; p != command; p++) {
if (*p == '\n') {
iPtr->errorLine++;
}
}
if (length < 0) {
length = strlen(command);
}
overflow = (length > limit);
Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
"\n %s\n\"%.*s%s\"", ((iPtr->errorInfo == NULL)
? "while executing" : "invoked from within"),
(overflow ? limit : length), command, (overflow ? "..." : "")));
varPtr = TclObjLookupVarEx(interp, iPtr->eiVar, NULL, TCL_GLOBAL_ONLY,
NULL, 0, 0, &arrayPtr);
if ((varPtr == NULL) || !TclIsVarTraced(varPtr)) {
/*
* Should not happen.
*/
return;
} else {
Tcl_HashEntry *hPtr = Tcl_FindHashEntry(&iPtr->varTraces,
(char *) varPtr);
VarTrace *tracePtr = Tcl_GetHashValue(hPtr);
if (tracePtr->traceProc != EstablishErrorInfoTraces) {
/*
* The most recent trace set on ::errorInfo is not the one the
* core itself puts on last. This means some other code is tracing
* the variable, and the additional trace(s) might be write traces
* that expect the timing of writes to ::errorInfo that existed
* Tcl releases before 8.5. To satisfy that compatibility need, we
* write the current -errorinfo value to the ::errorInfo variable.
*/
Tcl_ObjSetVar2(interp, iPtr->eiVar, NULL, iPtr->errorInfo,
TCL_GLOBAL_ONLY);
}
}
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
|
