// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package strings_test
import (
"bytes"
"fmt"
"io"
"math/rand"
"reflect"
"strconv"
. "strings"
"testing"
"unicode"
"unicode/utf8"
"unsafe"
)
func eq(a, b []string) bool {
if len(a) != len(b) {
return false
}
for i := 0; i < len(a); i++ {
if a[i] != b[i] {
return false
}
}
return true
}
var abcd = "abcd"
var faces = "☺☻☹"
var commas = "1,2,3,4"
var dots = "1....2....3....4"
type IndexTest struct {
s string
sep string
out int
}
var indexTests = []IndexTest{
{"", "", 0},
{"", "a", -1},
{"", "foo", -1},
{"fo", "foo", -1},
{"foo", "foo", 0},
{"oofofoofooo", "f", 2},
{"oofofoofooo", "foo", 4},
{"barfoobarfoo", "foo", 3},
{"foo", "", 0},
{"foo", "o", 1},
{"abcABCabc", "A", 3},
// cases with one byte strings - test special case in Index()
{"", "a", -1},
{"x", "a", -1},
{"x", "x", 0},
{"abc", "a", 0},
{"abc", "b", 1},
{"abc", "c", 2},
{"abc", "x", -1},
// test special cases in Index() for short strings
{"", "ab", -1},
{"bc", "ab", -1},
{"ab", "ab", 0},
{"xab", "ab", 1},
{"xab"[:2], "ab", -1},
{"", "abc", -1},
{"xbc", "abc", -1},
{"abc", "abc", 0},
{"xabc", "abc", 1},
{"xabc"[:3], "abc", -1},
{"xabxc", "abc", -1},
{"", "abcd", -1},
{"xbcd", "abcd", -1},
{"abcd", "abcd", 0},
{"xabcd", "abcd", 1},
{"xyabcd"[:5], "abcd", -1},
{"xbcqq", "abcqq", -1},
{"abcqq", "abcqq", 0},
{"xabcqq", "abcqq", 1},
{"xyabcqq"[:6], "abcqq", -1},
{"xabxcqq", "abcqq", -1},
{"xabcqxq", "abcqq", -1},
{"", "01234567", -1},
{"32145678", "01234567", -1},
{"01234567", "01234567", 0},
{"x01234567", "01234567", 1},
{"x0123456x01234567", "01234567", 9},
{"xx01234567"[:9], "01234567", -1},
{"", "0123456789", -1},
{"3214567844", "0123456789", -1},
{"0123456789", "0123456789", 0},
{"x0123456789", "0123456789", 1},
{"x012345678x0123456789", "0123456789", 11},
{"xyz0123456789"[:12], "0123456789", -1},
{"x01234567x89", "0123456789", -1},
{"", "0123456789012345", -1},
{"3214567889012345", "0123456789012345", -1},
{"0123456789012345", "0123456789012345", 0},
{"x0123456789012345", "0123456789012345", 1},
{"x012345678901234x0123456789012345", "0123456789012345", 17},
{"", "01234567890123456789", -1},
{"32145678890123456789", "01234567890123456789", -1},
{"01234567890123456789", "01234567890123456789", 0},
{"x01234567890123456789", "01234567890123456789", 1},
{"x0123456789012345678x01234567890123456789", "01234567890123456789", 21},
{"xyz01234567890123456789"[:22], "01234567890123456789", -1},
{"", "0123456789012345678901234567890", -1},
{"321456788901234567890123456789012345678911", "0123456789012345678901234567890", -1},
{"0123456789012345678901234567890", "0123456789012345678901234567890", 0},
{"x0123456789012345678901234567890", "0123456789012345678901234567890", 1},
{"x012345678901234567890123456789x0123456789012345678901234567890", "0123456789012345678901234567890", 32},
{"xyz0123456789012345678901234567890"[:33], "0123456789012345678901234567890", -1},
{"", "01234567890123456789012345678901", -1},
{"32145678890123456789012345678901234567890211", "01234567890123456789012345678901", -1},
{"01234567890123456789012345678901", "01234567890123456789012345678901", 0},
{"x01234567890123456789012345678901", "01234567890123456789012345678901", 1},
{"x0123456789012345678901234567890x01234567890123456789012345678901", "01234567890123456789012345678901", 33},
{"xyz01234567890123456789012345678901"[:34], "01234567890123456789012345678901", -1},
{"xxxxxx012345678901234567890123456789012345678901234567890123456789012", "012345678901234567890123456789012345678901234567890123456789012", 6},
{"", "0123456789012345678901234567890123456789", -1},
{"xx012345678901234567890123456789012345678901234567890123456789012", "0123456789012345678901234567890123456789", 2},
{"xx012345678901234567890123456789012345678901234567890123456789012"[:41], "0123456789012345678901234567890123456789", -1},
{"xx012345678901234567890123456789012345678901234567890123456789012", "0123456789012345678901234567890123456xxx", -1},
{"xx0123456789012345678901234567890123456789012345678901234567890120123456789012345678901234567890123456xxx", "0123456789012345678901234567890123456xxx", 65},
// test fallback to Rabin-Karp.
{"oxoxoxoxoxoxoxoxoxoxoxoy", "oy", 22},
{"oxoxoxoxoxoxoxoxoxoxoxox", "oy", -1},
}
var lastIndexTests = []IndexTest{
{"", "", 0},
{"", "a", -1},
{"", "foo", -1},
{"fo", "foo", -1},
{"foo", "foo", 0},
{"foo", "f", 0},
{"oofofoofooo", "f", 7},
{"oofofoofooo", "foo", 7},
{"barfoobarfoo", "foo", 9},
{"foo", "", 3},
{"foo", "o", 2},
{"abcABCabc", "A", 3},
{"abcABCabc", "a", 6},
}
var indexAnyTests = []IndexTest{
{"", "", -1},
{"", "a", -1},
{"", "abc", -1},
{"a", "", -1},
{"a", "a", 0},
{"aaa", "a", 0},
{"abc", "xyz", -1},
{"abc", "xcz", 2},
{"ab☺c", "x☺yz", 2},
{"a☺b☻c☹d", "cx", len("a☺b☻")},
{"a☺b☻c☹d", "uvw☻xyz", len("a☺b")},
{"aRegExp*", ".(|)*+?^$[]", 7},
{dots + dots + dots, " ", -1},
{"012abcba210", "\xffb", 4},
{"012\x80bcb\x80210", "\xffb", 3},
}
var lastIndexAnyTests = []IndexTest{
{"", "", -1},
{"", "a", -1},
{"", "abc", -1},
{"a", "", -1},
{"a", "a", 0},
{"aaa", "a", 2},
{"abc", "xyz", -1},
{"abc", "ab", 1},
{"ab☺c", "x☺yz", 2},
{"a☺b☻c☹d", "cx", len("a☺b☻")},
{"a☺b☻c☹d", "uvw☻xyz", len("a☺b")},
{"a.RegExp*", ".(|)*+?^$[]", 8},
{dots + dots + dots, " ", -1},
{"012abcba210", "\xffb", 6},
{"012\x80bcb\x80210", "\xffb", 7},
}
// Execute f on each test case. funcName should be the name of f; it's used
// in failure reports.
func runIndexTests(t *testing.T, f func(s, sep string) int, funcName string, testCases []IndexTest) {
for _, test := range testCases {
actual := f(test.s, test.sep)
if actual != test.out {
t.Errorf("%s(%q,%q) = %v; want %v", funcName, test.s, test.sep, actual, test.out)
}
}
}
func TestIndex(t *testing.T) { runIndexTests(t, Index, "Index", indexTests) }
func TestLastIndex(t *testing.T) { runIndexTests(t, LastIndex, "LastIndex", lastIndexTests) }
func TestIndexAny(t *testing.T) { runIndexTests(t, IndexAny, "IndexAny", indexAnyTests) }
func TestLastIndexAny(t *testing.T) { runIndexTests(t, LastIndexAny, "LastIndexAny", lastIndexAnyTests) }
func TestIndexByte(t *testing.T) {
for _, tt := range indexTests {
if len(tt.sep) != 1 {
continue
}
pos := IndexByte(tt.s, tt.sep[0])
if pos != tt.out {
t.Errorf(`IndexByte(%q, %q) = %v; want %v`, tt.s, tt.sep[0], pos, tt.out)
}
}
}
func TestLastIndexByte(t *testing.T) {
testCases := []IndexTest{
{"", "q", -1},
{"abcdef", "q", -1},
{"abcdefabcdef", "a", len("abcdef")}, // something in the middle
{"abcdefabcdef", "f", len("abcdefabcde")}, // last byte
{"zabcdefabcdef", "z", 0}, // first byte
{"a☺b☻c☹d", "b", len("a☺")}, // non-ascii
}
for _, test := range testCases {
actual := LastIndexByte(test.s, test.sep[0])
if actual != test.out {
t.Errorf("LastIndexByte(%q,%c) = %v; want %v", test.s, test.sep[0], actual, test.out)
}
}
}
func simpleIndex(s, sep string) int {
n := len(sep)
for i := n; i <= len(s); i++ {
if s[i-n:i] == sep {
return i - n
}
}
return -1
}
func TestIndexRandom(t *testing.T) {
const chars = "abcdefghijklmnopqrstuvwxyz0123456789"
for times := 0; times < 10; times++ {
for strLen := 5 + rand.Intn(5); strLen < 140; strLen += 10 { // Arbitrary
s1 := make([]byte, strLen)
for i := range s1 {
s1[i] = chars[rand.Intn(len(chars))]
}
s := string(s1)
for i := 0; i < 50; i++ {
begin := rand.Intn(len(s) + 1)
end := begin + rand.Intn(len(s)+1-begin)
sep := s[begin:end]
if i%4 == 0 {
pos := rand.Intn(len(sep) + 1)
sep = sep[:pos] + "A" + sep[pos:]
}
want := simpleIndex(s, sep)
res := Index(s, sep)
if res != want {
t.Errorf("Index(%s,%s) = %d; want %d", s, sep, res, want)
}
}
}
}
}
func TestIndexRune(t *testing.T) {
tests := []struct {
in string
rune rune
want int
}{
{"", 'a', -1},
{"", '☺', -1},
{"foo", '☹', -1},
{"foo", 'o', 1},
{"foo☺bar", '☺', 3},
{"foo☺☻☹bar", '☹', 9},
{"a A x", 'A', 2},
{"some_text=some_value", '=', 9},
{"☺a", 'a', 3},
{"a☻☺b", '☺', 4},
// RuneError should match any invalid UTF-8 byte sequence.
{"�", '�', 0},
{"\xff", '�', 0},
{"☻x�", '�', len("☻x")},
{"☻x\xe2\x98", '�', len("☻x")},
{"☻x\xe2\x98�", '�', len("☻x")},
{"☻x\xe2\x98x", '�', len("☻x")},
// Invalid rune values should never match.
{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", -1, -1},
{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", 0xD800, -1}, // Surrogate pair
{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", utf8.MaxRune + 1, -1},
}
for _, tt := range tests {
if got := IndexRune(tt.in, tt.rune); got != tt.want {
t.Errorf("IndexRune(%q, %d) = %v; want %v", tt.in, tt.rune, got, tt.want)
}
}
haystack := "test世界"
allocs := testing.AllocsPerRun(1000, func() {
if i := IndexRune(haystack, 's'); i != 2 {
t.Fatalf("'s' at %d; want 2", i)
}
if i := IndexRune(haystack, '世'); i != 4 {
t.Fatalf("'世' at %d; want 4", i)
}
})
if allocs != 0 && testing.CoverMode() == "" {
t.Errorf("expected no allocations, got %f", allocs)
}
}
const benchmarkString = "some_text=some☺value"
func BenchmarkIndexRune(b *testing.B) {
if got := IndexRune(benchmarkString, '☺'); got != 14 {
b.Fatalf("wrong index: expected 14, got=%d", got)
}
for i := 0; i < b.N; i++ {
IndexRune(benchmarkString, '☺')
}
}
var benchmarkLongString = Repeat(" ", 100) + benchmarkString
func BenchmarkIndexRuneLongString(b *testing.B) {
if got := IndexRune(benchmarkLongString, '☺'); got != 114 {
b.Fatalf("wrong index: expected 114, got=%d", got)
}
for i := 0; i < b.N; i++ {
IndexRune(benchmarkLongString, '☺')
}
}
func BenchmarkIndexRuneFastPath(b *testing.B) {
if got := IndexRune(benchmarkString, 'v'); got != 17 {
b.Fatalf("wrong index: expected 17, got=%d", got)
}
for i := 0; i < b.N; i++ {
IndexRune(benchmarkString, 'v')
}
}
func BenchmarkIndex(b *testing.B) {
if got := Index(benchmarkString, "v"); got != 17 {
b.Fatalf("wrong index: expected 17, got=%d", got)
}
for i := 0; i < b.N; i++ {
Index(benchmarkString, "v")
}
}
func BenchmarkLastIndex(b *testing.B) {
if got := Index(benchmarkString, "v"); got != 17 {
b.Fatalf("wrong index: expected 17, got=%d", got)
}
for i := 0; i < b.N; i++ {
LastIndex(benchmarkString, "v")
}
}
func BenchmarkIndexByte(b *testing.B) {
if got := IndexByte(benchmarkString, 'v'); got != 17 {
b.Fatalf("wrong index: expected 17, got=%d", got)
}
for i := 0; i < b.N; i++ {
IndexByte(benchmarkString, 'v')
}
}
type SplitTest struct {
s string
sep string
n int
a []string
}
var splittests = []SplitTest{
{"", "", -1, []string{}},
{abcd, "", 2, []string{"a", "bcd"}},
{abcd, "", 4, []string{"a", "b", "c", "d"}},
{abcd, "", -1, []string{"a", "b", "c", "d"}},
{faces, "", -1, []string{"☺", "☻", "☹"}},
{faces, "", 3, []string{"☺", "☻", "☹"}},
{faces, "", 17, []string{"☺", "☻", "☹"}},
{"☺�☹", "", -1, []string{"☺", "�", "☹"}},
{abcd, "a", 0, nil},
{abcd, "a", -1, []string{"", "bcd"}},
{abcd, "z", -1, []string{"abcd"}},
{commas, ",", -1, []string{"1", "2", "3", "4"}},
{dots, "...", -1, []string{"1", ".2", ".3", ".4"}},
{faces, "☹", -1, []string{"☺☻", ""}},
{faces, "~", -1, []string{faces}},
{"1 2 3 4", " ", 3, []string{"1", "2", "3 4"}},
{"1 2", " ", 3, []string{"1", "2"}},
}
func TestSplit(t *testing.T) {
for _, tt := range splittests {
a := SplitN(tt.s, tt.sep, tt.n)
if !eq(a, tt.a) {
t.Errorf("Split(%q, %q, %d) = %v; want %v", tt.s, tt.sep, tt.n, a, tt.a)
continue
}
if tt.n == 0 {
continue
}
s := Join(a, tt.sep)
if s != tt.s {
t.Errorf("Join(Split(%q, %q, %d), %q) = %q", tt.s, tt.sep, tt.n, tt.sep, s)
}
if tt.n < 0 {
b := Split(tt.s, tt.sep)
if !reflect.DeepEqual(a, b) {
t.Errorf("Split disagrees with SplitN(%q, %q, %d) = %v; want %v", tt.s, tt.sep, tt.n, b, a)
}
}
}
}
var splitaftertests = []SplitTest{
{abcd, "a", -1, []string{"a", "bcd"}},
{abcd, "z", -1, []string{"abcd"}},
{abcd, "", -1, []string{"a", "b", "c", "d"}},
{commas, ",", -1, []string{"1,", "2,", "3,", "4"}},
{dots, "...", -1, []string{"1...", ".2...", ".3...", ".4"}},
{faces, "☹", -1, []string{"☺☻☹", ""}},
{faces, "~", -1, []string{faces}},
{faces, "", -1, []string{"☺", "☻", "☹"}},
{"1 2 3 4", " ", 3, []string{"1 ", "2 ", "3 4"}},
{"1 2 3", " ", 3, []string{"1 ", "2 ", "3"}},
{"1 2", " ", 3, []string{"1 ", "2"}},
{"123", "", 2, []string{"1", "23"}},
{"123", "", 17, []string{"1", "2", "3"}},
}
func TestSplitAfter(t *testing.T) {
for _, tt := range splitaftertests {
a := SplitAfterN(tt.s, tt.sep, tt.n)
if !eq(a, tt.a) {
t.Errorf(`Split(%q, %q, %d) = %v; want %v`, tt.s, tt.sep, tt.n, a, tt.a)
continue
}
s := Join(a, "")
if s != tt.s {
t.Errorf(`Join(Split(%q, %q, %d), %q) = %q`, tt.s, tt.sep, tt.n, tt.sep, s)
}
if tt.n < 0 {
b := SplitAfter(tt.s, tt.sep)
if !reflect.DeepEqual(a, b) {
t.Errorf("SplitAfter disagrees with SplitAfterN(%q, %q, %d) = %v; want %v", tt.s, tt.sep, tt.n, b, a)
}
}
}
}
type FieldsTest struct {
s string
a []string
}
var fieldstests = []FieldsTest{
{"", []string{}},
{" ", []string{}},
{" \t ", []string{}},
{"\u2000", []string{}},
{" abc ", []string{"abc"}},
{"1 2 3 4", []string{"1", "2", "3", "4"}},
{"1 2 3 4", []string{"1", "2", "3", "4"}},
{"1\t\t2\t\t3\t4", []string{"1", "2", "3", "4"}},
{"1\u20002\u20013\u20024", []string{"1", "2", "3", "4"}},
{"\u2000\u2001\u2002", []string{}},
{"\n™\t™\n", []string{"™", "™"}},
{"\n\u20001™2\u2000 \u2001 ™", []string{"1™2", "™"}},
{"\n1\uFFFD \uFFFD2\u20003\uFFFD4", []string{"1\uFFFD", "\uFFFD2", "3\uFFFD4"}},
{"1\xFF\u2000\xFF2\xFF \xFF", []string{"1\xFF", "\xFF2\xFF", "\xFF"}},
{faces, []string{faces}},
}
func TestFields(t *testing.T) {
for _, tt := range fieldstests {
a := Fields(tt.s)
if !eq(a, tt.a) {
t.Errorf("Fields(%q) = %v; want %v", tt.s, a, tt.a)
continue
}
}
}
var FieldsFuncTests = []FieldsTest{
{"", []string{}},
{"XX", []string{}},
{"XXhiXXX", []string{"hi"}},
{"aXXbXXXcX", []string{"a", "b", "c"}},
}
func TestFieldsFunc(t *testing.T) {
for _, tt := range fieldstests {
a := FieldsFunc(tt.s, unicode.IsSpace)
if !eq(a, tt.a) {
t.Errorf("FieldsFunc(%q, unicode.IsSpace) = %v; want %v", tt.s, a, tt.a)
continue
}
}
pred := func(c rune) bool { return c == 'X' }
for _, tt := range FieldsFuncTests {
a := FieldsFunc(tt.s, pred)
if !eq(a, tt.a) {
t.Errorf("FieldsFunc(%q) = %v, want %v", tt.s, a, tt.a)
}
}
}
// Test case for any function which accepts and returns a single string.
type StringTest struct {
in, out string
}
// Execute f on each test case. funcName should be the name of f; it's used
// in failure reports.
func runStringTests(t *testing.T, f func(string) string, funcName string, testCases []StringTest) {
for _, tc := range testCases {
actual := f(tc.in)
if actual != tc.out {
t.Errorf("%s(%q) = %q; want %q", funcName, tc.in, actual, tc.out)
}
}
}
var upperTests = []StringTest{
{"", ""},
{"ONLYUPPER", "ONLYUPPER"},
{"abc", "ABC"},
{"AbC123", "ABC123"},
{"azAZ09_", "AZAZ09_"},
{"longStrinGwitHmixofsmaLLandcAps", "LONGSTRINGWITHMIXOFSMALLANDCAPS"},
{"long\u0250string\u0250with\u0250nonascii\u2C6Fchars", "LONG\u2C6FSTRING\u2C6FWITH\u2C6FNONASCII\u2C6FCHARS"},
{"\u0250\u0250\u0250\u0250\u0250", "\u2C6F\u2C6F\u2C6F\u2C6F\u2C6F"}, // grows one byte per char
{"a\u0080\U0010FFFF", "A\u0080\U0010FFFF"}, // test utf8.RuneSelf and utf8.MaxRune
}
var lowerTests = []StringTest{
{"", ""},
{"abc", "abc"},
{"AbC123", "abc123"},
{"azAZ09_", "azaz09_"},
{"longStrinGwitHmixofsmaLLandcAps", "longstringwithmixofsmallandcaps"},
{"LONG\u2C6FSTRING\u2C6FWITH\u2C6FNONASCII\u2C6FCHARS", "long\u0250string\u0250with\u0250nonascii\u0250chars"},
{"\u2C6D\u2C6D\u2C6D\u2C6D\u2C6D", "\u0251\u0251\u0251\u0251\u0251"}, // shrinks one byte per char
{"A\u0080\U0010FFFF", "a\u0080\U0010FFFF"}, // test utf8.RuneSelf and utf8.MaxRune
}
const space = "\t\v\r\f\n\u0085\u00a0\u2000\u3000"
var trimSpaceTests = []StringTest{
{"", ""},
{"abc", "abc"},
{space + "abc" + space, "abc"},
{" ", ""},
{" \t\r\n \t\t\r\r\n\n ", ""},
{" \t\r\n x\t\t\r\r\n\n ", "x"},
{" \u2000\t\r\n x\t\t\r\r\ny\n \u3000", "x\t\t\r\r\ny"},
{"1 \t\r\n2", "1 \t\r\n2"},
{" x\x80", "x\x80"},
{" x\xc0", "x\xc0"},
{"x \xc0\xc0 ", "x \xc0\xc0"},
{"x \xc0", "x \xc0"},
{"x \xc0 ", "x \xc0"},
{"x \xc0\xc0 ", "x \xc0\xc0"},
{"x ☺\xc0\xc0 ", "x ☺\xc0\xc0"},
{"x ☺ ", "x ☺"},
}
func tenRunes(ch rune) string {
r := make([]rune, 10)
for i := range r {
r[i] = ch
}
return string(r)
}
// User-defined self-inverse mapping function
func rot13(r rune) rune {
step := rune(13)
if r >= 'a' && r <= 'z' {
return ((r - 'a' + step) % 26) + 'a'
}
if r >= 'A' && r <= 'Z' {
return ((r - 'A' + step) % 26) + 'A'
}
return r
}
func TestMap(t *testing.T) {
// Run a couple of awful growth/shrinkage tests
a := tenRunes('a')
// 1. Grow. This triggers two reallocations in Map.
maxRune := func(rune) rune { return unicode.MaxRune }
m := Map(maxRune, a)
expect := tenRunes(unicode.MaxRune)
if m != expect {
t.Errorf("growing: expected %q got %q", expect, m)
}
// 2. Shrink
minRune := func(rune) rune { return 'a' }
m = Map(minRune, tenRunes(unicode.MaxRune))
expect = a
if m != expect {
t.Errorf("shrinking: expected %q got %q", expect, m)
}
// 3. Rot13
m = Map(rot13, "a to zed")
expect = "n gb mrq"
if m != expect {
t.Errorf("rot13: expected %q got %q", expect, m)
}
// 4. Rot13^2
m = Map(rot13, Map(rot13, "a to zed"))
expect = "a to zed"
if m != expect {
t.Errorf("rot13: expected %q got %q", expect, m)
}
// 5. Drop
dropNotLatin := func(r rune) rune {
if unicode.Is(unicode.Latin, r) {
return r
}
return -1
}
m = Map(dropNotLatin, "Hello, 세계")
expect = "Hello"
if m != expect {
t.Errorf("drop: expected %q got %q", expect, m)
}
// 6. Identity
identity := func(r rune) rune {
return r
}
orig := "Input string that we expect not to be copied."
m = Map(identity, orig)
if (*reflect.StringHeader)(unsafe.Pointer(&orig)).Data !=
(*reflect.StringHeader)(unsafe.Pointer(&m)).Data {
t.Error("unexpected copy during identity map")
}
// 7. Handle invalid UTF-8 sequence
replaceNotLatin := func(r rune) rune {
if unicode.Is(unicode.Latin, r) {
return r
}
return utf8.RuneError
}
m = Map(replaceNotLatin, "Hello\255World")
expect = "Hello\uFFFDWorld"
if m != expect {
t.Errorf("replace invalid sequence: expected %q got %q", expect, m)
}
// 8. Check utf8.RuneSelf and utf8.MaxRune encoding
encode := func(r rune) rune {
switch r {
case utf8.RuneSelf:
return unicode.MaxRune
case unicode.MaxRune:
return utf8.RuneSelf
}
return r
}
s := string(utf8.RuneSelf) + string(utf8.MaxRune)
r := string(utf8.MaxRune) + string(utf8.RuneSelf) // reverse of s
m = Map(encode, s)
if m != r {
t.Errorf("encoding not handled correctly: expected %q got %q", r, m)
}
m = Map(encode, r)
if m != s {
t.Errorf("encoding not handled correctly: expected %q got %q", s, m)
}
// 9. Check mapping occurs in the front, middle and back
trimSpaces := func(r rune) rune {
if unicode.IsSpace(r) {
return -1
}
return r
}
m = Map(trimSpaces, " abc 123 ")
expect = "abc123"
if m != expect {
t.Errorf("trimSpaces: expected %q got %q", expect, m)
}
}
func TestToUpper(t *testing.T) { runStringTests(t, ToUpper, "ToUpper", upperTests) }
func TestToLower(t *testing.T) { runStringTests(t, ToLower, "ToLower", lowerTests) }
var toValidUTF8Tests = []struct {
in string
repl string
out string
}{
{"", "\uFFFD", ""},
{"abc", "\uFFFD", "abc"},
{"\uFDDD", "\uFFFD", "\uFDDD"},
{"a\xffb", "\uFFFD", "a\uFFFDb"},
{"a\xffb\uFFFD", "X", "aXb\uFFFD"},
{"a☺\xffb☺\xC0\xAFc☺\xff", "", "a☺b☺c☺"},
{"a☺\xffb☺\xC0\xAFc☺\xff", "日本語", "a☺日本語b☺日本語c☺日本語"},
{"\xC0\xAF", "\uFFFD", "\uFFFD"},
{"\xE0\x80\xAF", "\uFFFD", "\uFFFD"},
{"\xed\xa0\x80", "abc", "abc"},
{"\xed\xbf\xbf", "\uFFFD", "\uFFFD"},
{"\xF0\x80\x80\xaf", "☺", "☺"},
{"\xF8\x80\x80\x80\xAF", "\uFFFD", "\uFFFD"},
{"\xFC\x80\x80\x80\x80\xAF", "\uFFFD", "\uFFFD"},
}
func TestToValidUTF8(t *testing.T) {
for _, tc := range toValidUTF8Tests {
got := ToValidUTF8(tc.in, tc.repl)
if got != tc.out {
t.Errorf("ToValidUTF8(%q, %q) = %q; want %q", tc.in, tc.repl, got, tc.out)
}
}
}
func BenchmarkToUpper(b *testing.B) {
for _, tc := range upperTests {
b.Run(tc.in, func(b *testing.B) {
for i := 0; i < b.N; i++ {
actual := ToUpper(tc.in)
if actual != tc.out {
b.Errorf("ToUpper(%q) = %q; want %q", tc.in, actual, tc.out)
}
}
})
}
}
func BenchmarkToLower(b *testing.B) {
for _, tc := range lowerTests {
b.Run(tc.in, func(b *testing.B) {
for i := 0; i < b.N; i++ {
actual := ToLower(tc.in)
if actual != tc.out {
b.Errorf("ToLower(%q) = %q; want %q", tc.in, actual, tc.out)
}
}
})
}
}
func BenchmarkMapNoChanges(b *testing.B) {
identity := func(r rune) rune {
return r
}
for i := 0; i < b.N; i++ {
Map(identity, "Some string that won't be modified.")
}
}
func TestSpecialCase(t *testing.T) {
lower := "abcçdefgğhıijklmnoöprsştuüvyz"
upper := "ABCÇDEFGĞHIİJKLMNOÖPRSŞTUÜVYZ"
u := ToUpperSpecial(unicode.TurkishCase, upper)
if u != upper {
t.Errorf("Upper(upper) is %s not %s", u, upper)
}
u = ToUpperSpecial(unicode.TurkishCase, lower)
if u != upper {
t.Errorf("Upper(lower) is %s not %s", u, upper)
}
l := ToLowerSpecial(unicode.TurkishCase, lower)
if l != lower {
t.Errorf("Lower(lower) is %s not %s", l, lower)
}
l = ToLowerSpecial(unicode.TurkishCase, upper)
if l != lower {
t.Errorf("Lower(upper) is %s not %s", l, lower)
}
}
func TestTrimSpace(t *testing.T) { runStringTests(t, TrimSpace, "TrimSpace", trimSpaceTests) }
var trimTests = []struct {
f string
in, arg, out string
}{
{"Trim", "abba", "a", "bb"},
{"Trim", "abba", "ab", ""},
{"TrimLeft", "abba", "ab", ""},
{"TrimRight", "abba", "ab", ""},
{"TrimLeft", "abba", "a", "bba"},
{"TrimRight", "abba", "a", "abb"},
{"Trim", "<tag>", "<>", "tag"},
{"Trim", "* listitem", " *", "listitem"},
{"Trim", `"quote"`, `"`, "quote"},
{"Trim", "\u2C6F\u2C6F\u0250\u0250\u2C6F\u2C6F", "\u2C6F", "\u0250\u0250"},
{"Trim", "\x80test\xff", "\xff", "test"},
{"Trim", " Ġ ", " ", "Ġ"},
{"Trim", " Ġİ0", "0 ", "Ġİ"},
//empty string tests
{"Trim", "abba", "", "abba"},
{"Trim", "", "123", ""},
{"Trim", "", "", ""},
{"TrimLeft", "abba", "", "abba"},
{"TrimLeft", "", "123", ""},
{"TrimLeft", "", "", ""},
{"TrimRight", "abba", "", "abba"},
{"TrimRight", "", "123", ""},
{"TrimRight", "", "", ""},
{"TrimRight", "☺\xc0", "☺", "☺\xc0"},
{"TrimPrefix", "aabb", "a", "abb"},
{"TrimPrefix", "aabb", "b", "aabb"},
{"TrimSuffix", "aabb", "a", "aabb"},
{"TrimSuffix", "aabb", "b", "aab"},
}
func TestTrim(t *testing.T) {
for _, tc := range trimTests {
name := tc.f
var f func(string, string) string
switch name {
case "Trim":
f = Trim
case "TrimLeft":
f = TrimLeft
case "TrimRight":
f = TrimRight
case "TrimPrefix":
f = TrimPrefix
case "TrimSuffix":
f = TrimSuffix
default:
t.Errorf("Undefined trim function %s", name)
}
actual := f(tc.in, tc.arg)
if actual != tc.out {
t.Errorf("%s(%q, %q) = %q; want %q", name, tc.in, tc.arg, actual, tc.out)
}
}
}
func BenchmarkTrim(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
for _, tc := range trimTests {
name := tc.f
var f func(string, string) string
switch name {
case "Trim":
f = Trim
case "TrimLeft":
f = TrimLeft
case "TrimRight":
f = TrimRight
case "TrimPrefix":
f = TrimPrefix
case "TrimSuffix":
f = TrimSuffix
default:
b.Errorf("Undefined trim function %s", name)
}
actual := f(tc.in, tc.arg)
if actual != tc.out {
b.Errorf("%s(%q, %q) = %q; want %q", name, tc.in, tc.arg, actual, tc.out)
}
}
}
}
func BenchmarkToValidUTF8(b *testing.B) {
tests := []struct {
name string
input string
}{
{"Valid", "typical"},
{"InvalidASCII", "foo\xffbar"},
{"InvalidNonASCII", "日本語\xff日本語"},
}
replacement := "\uFFFD"
b.ResetTimer()
for _, test := range tests {
b.Run(test.name, func(b *testing.B) {
for i := 0; i < b.N; i++ {
ToValidUTF8(test.input, replacement)
}
})
}
}
type predicate struct {
f func(rune) bool
name string
}
var isSpace = predicate{unicode.IsSpace, "IsSpace"}
var isDigit = predicate{unicode.IsDigit, "IsDigit"}
var isUpper = predicate{unicode.IsUpper, "IsUpper"}
var isValidRune = predicate{
func(r rune) bool {
return r != utf8.RuneError
},
"IsValidRune",
}
func not(p predicate) predicate {
return predicate{
func(r rune) bool {
return !p.f(r)
},
"not " + p.name,
}
}
var trimFuncTests = []struct {
f predicate
in string
trimOut string
leftOut string
rightOut string
}{
{isSpace, space + " hello " + space,
"hello",
"hello " + space,
space + " hello"},
{isDigit, "\u0e50\u0e5212hello34\u0e50\u0e51",
"hello",
"hello34\u0e50\u0e51",
"\u0e50\u0e5212hello"},
{isUpper, "\u2C6F\u2C6F\u2C6F\u2C6FABCDhelloEF\u2C6F\u2C6FGH\u2C6F\u2C6F",
"hello",
"helloEF\u2C6F\u2C6FGH\u2C6F\u2C6F",
"\u2C6F\u2C6F\u2C6F\u2C6FABCDhello"},
{not(isSpace), "hello" + space + "hello",
space,
space + "hello",
"hello" + space},
{not(isDigit), "hello\u0e50\u0e521234\u0e50\u0e51helo",
"\u0e50\u0e521234\u0e50\u0e51",
"\u0e50\u0e521234\u0e50\u0e51helo",
"hello\u0e50\u0e521234\u0e50\u0e51"},
{isValidRune, "ab\xc0a\xc0cd",
"\xc0a\xc0",
"\xc0a\xc0cd",
"ab\xc0a\xc0"},
{not(isValidRune), "\xc0a\xc0",
"a",
"a\xc0",
"\xc0a"},
{isSpace, "",
"",
"",
""},
{isSpace, " ",
"",
"",
""},
}
func TestTrimFunc(t *testing.T) {
for _, tc := range trimFuncTests {
trimmers := []struct {
name string
trim func(s string, f func(r rune) bool) string
out string
}{
{"TrimFunc", TrimFunc, tc.trimOut},
{"TrimLeftFunc", TrimLeftFunc, tc.leftOut},
{"TrimRightFunc", TrimRightFunc, tc.rightOut},
}
for _, trimmer := range trimmers {
actual := trimmer.trim(tc.in, tc.f.f)
if actual != trimmer.out {
t.Errorf("%s(%q, %q) = %q; want %q", trimmer.name, tc.in, tc.f.name, actual, trimmer.out)
}
}
}
}
var indexFuncTests = []struct {
in string
f predicate
first, last int
}{
{"", isValidRune, -1, -1},
{"abc", isDigit, -1, -1},
{"0123", isDigit, 0, 3},
{"a1b", isDigit, 1, 1},
{space, isSpace, 0, len(space) - 3}, // last rune in space is 3 bytes
{"\u0e50\u0e5212hello34\u0e50\u0e51", isDigit, 0, 18},
{"\u2C6F\u2C6F\u2C6F\u2C6FABCDhelloEF\u2C6F\u2C6FGH\u2C6F\u2C6F", isUpper, 0, 34},
{"12\u0e50\u0e52hello34\u0e50\u0e51", not(isDigit), 8, 12},
// tests of invalid UTF-8
{"\x801", isDigit, 1, 1},
{"\x80abc", isDigit, -1, -1},
{"\xc0a\xc0", isValidRune, 1, 1},
{"\xc0a\xc0", not(isValidRune), 0, 2},
{"\xc0☺\xc0", not(isValidRune), 0, 4},
{"\xc0☺\xc0\xc0", not(isValidRune), 0, 5},
{"ab\xc0a\xc0cd", not(isValidRune), 2, 4},
{"a\xe0\x80cd", not(isValidRune), 1, 2},
{"\x80\x80\x80\x80", not(isValidRune), 0, 3},
}
func TestIndexFunc(t *testing.T) {
for _, tc := range indexFuncTests {
first := IndexFunc(tc.in, tc.f.f)
if first != tc.first {
t.Errorf("IndexFunc(%q, %s) = %d; want %d", tc.in, tc.f.name, first, tc.first)
}
last := LastIndexFunc(tc.in, tc.f.f)
if last != tc.last {
t.Errorf("LastIndexFunc(%q, %s) = %d; want %d", tc.in, tc.f.name, last, tc.last)
}
}
}
func equal(m string, s1, s2 string, t *testing.T) bool {
if s1 == s2 {
return true
}
e1 := Split(s1, "")
e2 := Split(s2, "")
for i, c1 := range e1 {
if i >= len(e2) {
break
}
r1, _ := utf8.DecodeRuneInString(c1)
r2, _ := utf8.DecodeRuneInString(e2[i])
if r1 != r2 {
t.Errorf("%s diff at %d: U+%04X U+%04X", m, i, r1, r2)
}
}
return false
}
func TestCaseConsistency(t *testing.T) {
// Make a string of all the runes.
numRunes := int(unicode.MaxRune + 1)
if testing.Short() {
numRunes = 1000
}
a := make([]rune, numRunes)
for i := range a {
a[i] = rune(i)
}
s := string(a)
// convert the cases.
upper := ToUpper(s)
lower := ToLower(s)
// Consistency checks
if n := utf8.RuneCountInString(upper); n != numRunes {
t.Error("rune count wrong in upper:", n)
}
if n := utf8.RuneCountInString(lower); n != numRunes {
t.Error("rune count wrong in lower:", n)
}
if !equal("ToUpper(upper)", ToUpper(upper), upper, t) {
t.Error("ToUpper(upper) consistency fail")
}
if !equal("ToLower(lower)", ToLower(lower), lower, t) {
t.Error("ToLower(lower) consistency fail")
}
/*
These fail because of non-one-to-oneness of the data, such as multiple
upper case 'I' mapping to 'i'. We comment them out but keep them for
interest.
For instance: CAPITAL LETTER I WITH DOT ABOVE:
unicode.ToUpper(unicode.ToLower('\u0130')) != '\u0130'
if !equal("ToUpper(lower)", ToUpper(lower), upper, t) {
t.Error("ToUpper(lower) consistency fail");
}
if !equal("ToLower(upper)", ToLower(upper), lower, t) {
t.Error("ToLower(upper) consistency fail");
}
*/
}
var RepeatTests = []struct {
in, out string
count int
}{
{"", "", 0},
{"", "", 1},
{"", "", 2},
{"-", "", 0},
{"-", "-", 1},
{"-", "----------", 10},
{"abc ", "abc abc abc ", 3},
}
func TestRepeat(t *testing.T) {
for _, tt := range RepeatTests {
a := Repeat(tt.in, tt.count)
if !equal("Repeat(s)", a, tt.out, t) {
t.Errorf("Repeat(%v, %d) = %v; want %v", tt.in, tt.count, a, tt.out)
continue
}
}
}
func repeat(s string, count int) (err error) {
defer func() {
if r := recover(); r != nil {
switch v := r.(type) {
case error:
err = v
default:
err = fmt.Errorf("%s", v)
}
}
}()
Repeat(s, count)
return
}
// See Issue golang.org/issue/16237
func TestRepeatCatchesOverflow(t *testing.T) {
tests := [...]struct {
s string
count int
errStr string
}{
0: {"--", -2147483647, "negative"},
1: {"", int(^uint(0) >> 1), ""},
2: {"-", 10, ""},
3: {"gopher", 0, ""},
4: {"-", -1, "negative"},
5: {"--", -102, "negative"},
6: {string(make([]byte, 255)), int((^uint(0))/255 + 1), "overflow"},
}
for i, tt := range tests {
err := repeat(tt.s, tt.count)
if tt.errStr == "" {
if err != nil {
t.Errorf("#%d panicked %v", i, err)
}
continue
}
if err == nil || !Contains(err.Error(), tt.errStr) {
t.Errorf("#%d expected %q got %q", i, tt.errStr, err)
}
}
}
func runesEqual(a, b []rune) bool {
if len(a) != len(b) {
return false
}
for i, r := range a {
if r != b[i] {
return false
}
}
return true
}
var RunesTests = []struct {
in string
out []rune
lossy bool
}{
{"", []rune{}, false},
{" ", []rune{32}, false},
{"ABC", []rune{65, 66, 67}, false},
{"abc", []rune{97, 98, 99}, false},
{"\u65e5\u672c\u8a9e", []rune{26085, 26412, 35486}, false},
{"ab\x80c", []rune{97, 98, 0xFFFD, 99}, true},
{"ab\xc0c", []rune{97, 98, 0xFFFD, 99}, true},
}
func TestRunes(t *testing.T) {
for _, tt := range RunesTests {
a := []rune(tt.in)
if !runesEqual(a, tt.out) {
t.Errorf("[]rune(%q) = %v; want %v", tt.in, a, tt.out)
continue
}
if !tt.lossy {
// can only test reassembly if we didn't lose information
s := string(a)
if s != tt.in {
t.Errorf("string([]rune(%q)) = %x; want %x", tt.in, s, tt.in)
}
}
}
}
func TestReadByte(t *testing.T) {
testStrings := []string{"", abcd, faces, commas}
for _, s := range testStrings {
reader := NewReader(s)
if e := reader.UnreadByte(); e == nil {
t.Errorf("Unreading %q at beginning: expected error", s)
}
var res bytes.Buffer
for {
b, e := reader.ReadByte()
if e == io.EOF {
break
}
if e != nil {
t.Errorf("Reading %q: %s", s, e)
break
}
res.WriteByte(b)
// unread and read again
e = reader.UnreadByte()
if e != nil {
t.Errorf("Unreading %q: %s", s, e)
break
}
b1, e := reader.ReadByte()
if e != nil {
t.Errorf("Reading %q after unreading: %s", s, e)
break
}
if b1 != b {
t.Errorf("Reading %q after unreading: want byte %q, got %q", s, b, b1)
break
}
}
if res.String() != s {
t.Errorf("Reader(%q).ReadByte() produced %q", s, res.String())
}
}
}
func TestReadRune(t *testing.T) {
testStrings := []string{"", abcd, faces, commas}
for _, s := range testStrings {
reader := NewReader(s)
if e := reader.UnreadRune(); e == nil {
t.Errorf("Unreading %q at beginning: expected error", s)
}
res := ""
for {
r, z, e := reader.ReadRune()
if e == io.EOF {
break
}
if e != nil {
t.Errorf("Reading %q: %s", s, e)
break
}
res += string(r)
// unread and read again
e = reader.UnreadRune()
if e != nil {
t.Errorf("Unreading %q: %s", s, e)
break
}
r1, z1, e := reader.ReadRune()
if e != nil {
t.Errorf("Reading %q after unreading: %s", s, e)
break
}
if r1 != r {
t.Errorf("Reading %q after unreading: want rune %q, got %q", s, r, r1)
break
}
if z1 != z {
t.Errorf("Reading %q after unreading: want size %d, got %d", s, z, z1)
break
}
}
if res != s {
t.Errorf("Reader(%q).ReadRune() produced %q", s, res)
}
}
}
var UnreadRuneErrorTests = []struct {
name string
f func(*Reader)
}{
{"Read", func(r *Reader) { r.Read([]byte{0}) }},
{"ReadByte", func(r *Reader) { r.ReadByte() }},
{"UnreadRune", func(r *Reader) { r.UnreadRune() }},
{"Seek", func(r *Reader) { r.Seek(0, io.SeekCurrent) }},
{"WriteTo", func(r *Reader) { r.WriteTo(&bytes.Buffer{}) }},
}
func TestUnreadRuneError(t *testing.T) {
for _, tt := range UnreadRuneErrorTests {
reader := NewReader("0123456789")
if _, _, err := reader.ReadRune(); err != nil {
// should not happen
t.Fatal(err)
}
tt.f(reader)
err := reader.UnreadRune()
if err == nil {
t.Errorf("Unreading after %s: expected error", tt.name)
}
}
}
var ReplaceTests = []struct {
in string
old, new string
n int
out string
}{
{"hello", "l", "L", 0, "hello"},
{"hello", "l", "L", -1, "heLLo"},
{"hello", "x", "X", -1, "hello"},
{"", "x", "X", -1, ""},
{"radar", "r", "<r>", -1, "<r>ada<r>"},
{"", "", "<>", -1, "<>"},
{"banana", "a", "<>", -1, "b<>n<>n<>"},
{"banana", "a", "<>", 1, "b<>nana"},
{"banana", "a", "<>", 1000, "b<>n<>n<>"},
{"banana", "an", "<>", -1, "b<><>a"},
{"banana", "ana", "<>", -1, "b<>na"},
{"banana", "", "<>", -1, "<>b<>a<>n<>a<>n<>a<>"},
{"banana", "", "<>", 10, "<>b<>a<>n<>a<>n<>a<>"},
{"banana", "", "<>", 6, "<>b<>a<>n<>a<>n<>a"},
{"banana", "", "<>", 5, "<>b<>a<>n<>a<>na"},
{"banana", "", "<>", 1, "<>banana"},
{"banana", "a", "a", -1, "banana"},
{"banana", "a", "a", 1, "banana"},
{"☺☻☹", "", "<>", -1, "<>☺<>☻<>☹<>"},
}
func TestReplace(t *testing.T) {
for _, tt := range ReplaceTests {
if s := Replace(tt.in, tt.old, tt.new, tt.n); s != tt.out {
t.Errorf("Replace(%q, %q, %q, %d) = %q, want %q", tt.in, tt.old, tt.new, tt.n, s, tt.out)
}
if tt.n == -1 {
s := ReplaceAll(tt.in, tt.old, tt.new)
if s != tt.out {
t.Errorf("ReplaceAll(%q, %q, %q) = %q, want %q", tt.in, tt.old, tt.new, s, tt.out)
}
}
}
}
var TitleTests = []struct {
in, out string
}{
{"", ""},
{"a", "A"},
{" aaa aaa aaa ", " Aaa Aaa Aaa "},
{" Aaa Aaa Aaa ", " Aaa Aaa Aaa "},
{"123a456", "123a456"},
{"double-blind", "Double-Blind"},
{"ÿøû", "Ÿøû"},
{"with_underscore", "With_underscore"},
{"unicode \xe2\x80\xa8 line separator", "Unicode \xe2\x80\xa8 Line Separator"},
}
func TestTitle(t *testing.T) {
for _, tt := range TitleTests {
if s := Title(tt.in); s != tt.out {
t.Errorf("Title(%q) = %q, want %q", tt.in, s, tt.out)
}
}
}
var ContainsTests = []struct {
str, substr string
expected bool
}{
{"abc", "bc", true},
{"abc", "bcd", false},
{"abc", "", true},
{"", "a", false},
// cases to cover code in runtime/asm_amd64.s:indexShortStr
// 2-byte needle
{"xxxxxx", "01", false},
{"01xxxx", "01", true},
{"xx01xx", "01", true},
{"xxxx01", "01", true},
{"01xxxxx"[1:], "01", false},
{"xxxxx01"[:6], "01", false},
// 3-byte needle
{"xxxxxxx", "012", false},
{"012xxxx", "012", true},
{"xx012xx", "012", true},
{"xxxx012", "012", true},
{"012xxxxx"[1:], "012", false},
{"xxxxx012"[:7], "012", false},
// 4-byte needle
{"xxxxxxxx", "0123", false},
{"0123xxxx", "0123", true},
{"xx0123xx", "0123", true},
{"xxxx0123", "0123", true},
{"0123xxxxx"[1:], "0123", false},
{"xxxxx0123"[:8], "0123", false},
// 5-7-byte needle
{"xxxxxxxxx", "01234", false},
{"01234xxxx", "01234", true},
{"xx01234xx", "01234", true},
{"xxxx01234", "01234", true},
{"01234xxxxx"[1:], "01234", false},
{"xxxxx01234"[:9], "01234", false},
// 8-byte needle
{"xxxxxxxxxxxx", "01234567", false},
{"01234567xxxx", "01234567", true},
{"xx01234567xx", "01234567", true},
{"xxxx01234567", "01234567", true},
{"01234567xxxxx"[1:], "01234567", false},
{"xxxxx01234567"[:12], "01234567", false},
// 9-15-byte needle
{"xxxxxxxxxxxxx", "012345678", false},
{"012345678xxxx", "012345678", true},
{"xx012345678xx", "012345678", true},
{"xxxx012345678", "012345678", true},
{"012345678xxxxx"[1:], "012345678", false},
{"xxxxx012345678"[:13], "012345678", false},
// 16-byte needle
{"xxxxxxxxxxxxxxxxxxxx", "0123456789ABCDEF", false},
{"0123456789ABCDEFxxxx", "0123456789ABCDEF", true},
{"xx0123456789ABCDEFxx", "0123456789ABCDEF", true},
{"xxxx0123456789ABCDEF", "0123456789ABCDEF", true},
{"0123456789ABCDEFxxxxx"[1:], "0123456789ABCDEF", false},
{"xxxxx0123456789ABCDEF"[:20], "0123456789ABCDEF", false},
// 17-31-byte needle
{"xxxxxxxxxxxxxxxxxxxxx", "0123456789ABCDEFG", false},
{"0123456789ABCDEFGxxxx", "0123456789ABCDEFG", true},
{"xx0123456789ABCDEFGxx", "0123456789ABCDEFG", true},
{"xxxx0123456789ABCDEFG", "0123456789ABCDEFG", true},
{"0123456789ABCDEFGxxxxx"[1:], "0123456789ABCDEFG", false},
{"xxxxx0123456789ABCDEFG"[:21], "0123456789ABCDEFG", false},
// partial match cases
{"xx01x", "012", false}, // 3
{"xx0123x", "01234", false}, // 5-7
{"xx01234567x", "012345678", false}, // 9-15
{"xx0123456789ABCDEFx", "0123456789ABCDEFG", false}, // 17-31, issue 15679
}
func TestContains(t *testing.T) {
for _, ct := range ContainsTests {
if Contains(ct.str, ct.substr) != ct.expected {
t.Errorf("Contains(%s, %s) = %v, want %v",
ct.str, ct.substr, !ct.expected, ct.expected)
}
}
}
var ContainsAnyTests = []struct {
str, substr string
expected bool
}{
{"", "", false},
{"", "a", false},
{"", "abc", false},
{"a", "", false},
{"a", "a", true},
{"aaa", "a", true},
{"abc", "xyz", false},
{"abc", "xcz", true},
{"a☺b☻c☹d", "uvw☻xyz", true},
{"aRegExp*", ".(|)*+?^$[]", true},
{dots + dots + dots, " ", false},
}
func TestContainsAny(t *testing.T) {
for _, ct := range ContainsAnyTests {
if ContainsAny(ct.str, ct.substr) != ct.expected {
t.Errorf("ContainsAny(%s, %s) = %v, want %v",
ct.str, ct.substr, !ct.expected, ct.expected)
}
}
}
var ContainsRuneTests = []struct {
str string
r rune
expected bool
}{
{"", 'a', false},
{"a", 'a', true},
{"aaa", 'a', true},
{"abc", 'y', false},
{"abc", 'c', true},
{"a☺b☻c☹d", 'x', false},
{"a☺b☻c☹d", '☻', true},
{"aRegExp*", '*', true},
}
func TestContainsRune(t *testing.T) {
for _, ct := range ContainsRuneTests {
if ContainsRune(ct.str, ct.r) != ct.expected {
t.Errorf("ContainsRune(%q, %q) = %v, want %v",
ct.str, ct.r, !ct.expected, ct.expected)
}
}
}
var EqualFoldTests = []struct {
s, t string
out bool
}{
{"abc", "abc", true},
{"ABcd", "ABcd", true},
{"123abc", "123ABC", true},
{"αβδ", "ΑΒΔ", true},
{"abc", "xyz", false},
{"abc", "XYZ", false},
{"abcdefghijk", "abcdefghijX", false},
{"abcdefghijk", "abcdefghij\u212A", true},
{"abcdefghijK", "abcdefghij\u212A", true},
{"abcdefghijkz", "abcdefghij\u212Ay", false},
{"abcdefghijKz", "abcdefghij\u212Ay", false},
{"1", "2", false},
{"utf-8", "US-ASCII", false},
}
func TestEqualFold(t *testing.T) {
for _, tt := range EqualFoldTests {
if out := EqualFold(tt.s, tt.t); out != tt.out {
t.Errorf("EqualFold(%#q, %#q) = %v, want %v", tt.s, tt.t, out, tt.out)
}
if out := EqualFold(tt.t, tt.s); out != tt.out {
t.Errorf("EqualFold(%#q, %#q) = %v, want %v", tt.t, tt.s, out, tt.out)
}
}
}
func BenchmarkEqualFold(b *testing.B) {
for i := 0; i < b.N; i++ {
for _, tt := range EqualFoldTests {
if out := EqualFold(tt.s, tt.t); out != tt.out {
b.Fatal("wrong result")
}
}
}
}
var CountTests = []struct {
s, sep string
num int
}{
{"", "", 1},
{"", "notempty", 0},
{"notempty", "", 9},
{"smaller", "not smaller", 0},
{"12345678987654321", "6", 2},
{"611161116", "6", 3},
{"notequal", "NotEqual", 0},
{"equal", "equal", 1},
{"abc1231231123q", "123", 3},
{"11111", "11", 2},
}
func TestCount(t *testing.T) {
for _, tt := range CountTests {
if num := Count(tt.s, tt.sep); num != tt.num {
t.Errorf("Count(\"%s\", \"%s\") = %d, want %d", tt.s, tt.sep, num, tt.num)
}
}
}
func makeBenchInputHard() string {
tokens := [...]string{
"<a>", "<p>", "<b>", "<strong>",
"</a>", "</p>", "</b>", "</strong>",
"hello", "world",
}
x := make([]byte, 0, 1<<20)
for {
i := rand.Intn(len(tokens))
if len(x)+len(tokens[i]) >= 1<<20 {
break
}
x = append(x, tokens[i]...)
}
return string(x)
}
var benchInputHard = makeBenchInputHard()
func benchmarkIndexHard(b *testing.B, sep string) {
for i := 0; i < b.N; i++ {
Index(benchInputHard, sep)
}
}
func benchmarkLastIndexHard(b *testing.B, sep string) {
for i := 0; i < b.N; i++ {
LastIndex(benchInputHard, sep)
}
}
func benchmarkCountHard(b *testing.B, sep string) {
for i := 0; i < b.N; i++ {
Count(benchInputHard, sep)
}
}
func BenchmarkIndexHard1(b *testing.B) { benchmarkIndexHard(b, "<>") }
func BenchmarkIndexHard2(b *testing.B) { benchmarkIndexHard(b, "</pre>") }
func BenchmarkIndexHard3(b *testing.B) { benchmarkIndexHard(b, "<b>hello world</b>") }
func BenchmarkIndexHard4(b *testing.B) {
benchmarkIndexHard(b, "<pre><b>hello</b><strong>world</strong></pre>")
}
func BenchmarkLastIndexHard1(b *testing.B) { benchmarkLastIndexHard(b, "<>") }
func BenchmarkLastIndexHard2(b *testing.B) { benchmarkLastIndexHard(b, "</pre>") }
func BenchmarkLastIndexHard3(b *testing.B) { benchmarkLastIndexHard(b, "<b>hello world</b>") }
func BenchmarkCountHard1(b *testing.B) { benchmarkCountHard(b, "<>") }
func BenchmarkCountHard2(b *testing.B) { benchmarkCountHard(b, "</pre>") }
func BenchmarkCountHard3(b *testing.B) { benchmarkCountHard(b, "<b>hello world</b>") }
var benchInputTorture = Repeat("ABC", 1<<10) + "123" + Repeat("ABC", 1<<10)
var benchNeedleTorture = Repeat("ABC", 1<<10+1)
func BenchmarkIndexTorture(b *testing.B) {
for i := 0; i < b.N; i++ {
Index(benchInputTorture, benchNeedleTorture)
}
}
func BenchmarkCountTorture(b *testing.B) {
for i := 0; i < b.N; i++ {
Count(benchInputTorture, benchNeedleTorture)
}
}
func BenchmarkCountTortureOverlapping(b *testing.B) {
A := Repeat("ABC", 1<<20)
B := Repeat("ABC", 1<<10)
for i := 0; i < b.N; i++ {
Count(A, B)
}
}
func BenchmarkCountByte(b *testing.B) {
indexSizes := []int{10, 32, 4 << 10, 4 << 20, 64 << 20}
benchStr := Repeat(benchmarkString,
(indexSizes[len(indexSizes)-1]+len(benchmarkString)-1)/len(benchmarkString))
benchFunc := func(b *testing.B, benchStr string) {
b.SetBytes(int64(len(benchStr)))
for i := 0; i < b.N; i++ {
Count(benchStr, "=")
}
}
for _, size := range indexSizes {
b.Run(fmt.Sprintf("%d", size), func(b *testing.B) {
benchFunc(b, benchStr[:size])
})
}
}
var makeFieldsInput = func() string {
x := make([]byte, 1<<20)
// Input is ~10% space, ~10% 2-byte UTF-8, rest ASCII non-space.
for i := range x {
switch rand.Intn(10) {
case 0:
x[i] = ' '
case 1:
if i > 0 && x[i-1] == 'x' {
copy(x[i-1:], "χ")
break
}
fallthrough
default:
x[i] = 'x'
}
}
return string(x)
}
var makeFieldsInputASCII = func() string {
x := make([]byte, 1<<20)
// Input is ~10% space, rest ASCII non-space.
for i := range x {
if rand.Intn(10) == 0 {
x[i] = ' '
} else {
x[i] = 'x'
}
}
return string(x)
}
var stringdata = []struct{ name, data string }{
{"ASCII", makeFieldsInputASCII()},
{"Mixed", makeFieldsInput()},
}
func BenchmarkFields(b *testing.B) {
for _, sd := range stringdata {
b.Run(sd.name, func(b *testing.B) {
for j := 1 << 4; j <= 1<<20; j <<= 4 {
b.Run(fmt.Sprintf("%d", j), func(b *testing.B) {
b.ReportAllocs()
b.SetBytes(int64(j))
data := sd.data[:j]
for i := 0; i < b.N; i++ {
Fields(data)
}
})
}
})
}
}
func BenchmarkFieldsFunc(b *testing.B) {
for _, sd := range stringdata {
b.Run(sd.name, func(b *testing.B) {
for j := 1 << 4; j <= 1<<20; j <<= 4 {
b.Run(fmt.Sprintf("%d", j), func(b *testing.B) {
b.ReportAllocs()
b.SetBytes(int64(j))
data := sd.data[:j]
for i := 0; i < b.N; i++ {
FieldsFunc(data, unicode.IsSpace)
}
})
}
})
}
}
func BenchmarkSplitEmptySeparator(b *testing.B) {
for i := 0; i < b.N; i++ {
Split(benchInputHard, "")
}
}
func BenchmarkSplitSingleByteSeparator(b *testing.B) {
for i := 0; i < b.N; i++ {
Split(benchInputHard, "/")
}
}
func BenchmarkSplitMultiByteSeparator(b *testing.B) {
for i := 0; i < b.N; i++ {
Split(benchInputHard, "hello")
}
}
func BenchmarkSplitNSingleByteSeparator(b *testing.B) {
for i := 0; i < b.N; i++ {
SplitN(benchInputHard, "/", 10)
}
}
func BenchmarkSplitNMultiByteSeparator(b *testing.B) {
for i := 0; i < b.N; i++ {
SplitN(benchInputHard, "hello", 10)
}
}
func BenchmarkRepeat(b *testing.B) {
s := "0123456789"
for _, n := range []int{5, 10} {
for _, c := range []int{1, 2, 6} {
b.Run(fmt.Sprintf("%dx%d", n, c), func(b *testing.B) {
for i := 0; i < b.N; i++ {
Repeat(s[:n], c)
}
})
}
}
}
func BenchmarkIndexAnyASCII(b *testing.B) {
x := Repeat("#", 4096) // Never matches set
cs := "0123456789abcdef"
for k := 1; k <= 4096; k <<= 4 {
for j := 1; j <= 16; j <<= 1 {
b.Run(fmt.Sprintf("%d:%d", k, j), func(b *testing.B) {
for i := 0; i < b.N; i++ {
IndexAny(x[:k], cs[:j])
}
})
}
}
}
func BenchmarkTrimASCII(b *testing.B) {
cs := "0123456789abcdef"
for k := 1; k <= 4096; k <<= 4 {
for j := 1; j <= 16; j <<= 1 {
b.Run(fmt.Sprintf("%d:%d", k, j), func(b *testing.B) {
x := Repeat(cs[:j], k) // Always matches set
for i := 0; i < b.N; i++ {
Trim(x[:k], cs[:j])
}
})
}
}
}
func BenchmarkIndexPeriodic(b *testing.B) {
key := "aa"
for _, skip := range [...]int{2, 4, 8, 16, 32, 64} {
b.Run(fmt.Sprintf("IndexPeriodic%d", skip), func(b *testing.B) {
s := Repeat("a"+Repeat(" ", skip-1), 1<<16/skip)
for i := 0; i < b.N; i++ {
Index(s, key)
}
})
}
}
func BenchmarkJoin(b *testing.B) {
vals := []string{"red", "yellow", "pink", "green", "purple", "orange", "blue"}
for l := 0; l <= len(vals); l++ {
b.Run(strconv.Itoa(l), func(b *testing.B) {
b.ReportAllocs()
vals := vals[:l]
for i := 0; i < b.N; i++ {
Join(vals, " and ")
}
})
}
}
func BenchmarkTrimSpace(b *testing.B) {
tests := []struct{ name, input string }{
{"NoTrim", "typical"},
{"ASCII", " foo bar "},
{"SomeNonASCII", " \u2000\t\r\n x\t\t\r\r\ny\n \u3000 "},
{"JustNonASCII", "\u2000\u2000\u2000☺☺☺☺\u3000\u3000\u3000"},
}
for _, test := range tests {
b.Run(test.name, func(b *testing.B) {
for i := 0; i < b.N; i++ {
TrimSpace(test.input)
}
})
}
}
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