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- // 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"
- "runtime"
- "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},
- {"\x80", "\xffb", 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*", ".(|)*+?^$[]", 7},
- {dots + dots + dots, " ", -1},
- {"012abcba210", "\xffb", 4},
- {"012\x80bcb\x80210", "\xffb", 3},
- {"0123456\xcf\x80abc", "\xcfb\x80", 10},
- }
- var lastIndexAnyTests = []IndexTest{
- {"", "", -1},
- {"", "a", -1},
- {"", "abc", -1},
- {"a", "", -1},
- {"a", "a", 0},
- {"\x80", "\xffb", 0},
- {"aaa", "a", 2},
- {"abc", "xyz", -1},
- {"abc", "ab", 1},
- {"ab☺c", "x☺yz", 2},
- {"a☺b☻c☹d", "cx", len("a☺b☻")},
- {"a☺b☻c☹d", "uvw☻xyz", len("a☺b")},
- {"a.RegExp*", ".(|)*+?^$[]", 8},
- {dots + dots + dots, " ", -1},
- {"012abcba210", "\xffb", 6},
- {"012\x80bcb\x80210", "\xffb", 7},
- {"0123456\xcf\x80abc", "\xcfb\x80", 10},
- }
- // 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 runtime.Compiler == "gccgo" {
- t.Skip("skipping allocations test for gccgo until escape analysis is enabled")
- }
- 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(rune(utf8.RuneSelf)) + string(utf8.MaxRune)
- r := string(utf8.MaxRune) + string(rune(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"},
- {"TrimLeft", "abba", "b", "abba"},
- {"TrimRight", "abba", "a", "abb"},
- {"TrimRight", "abba", "b", "abba"},
- {"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(%q, %q) = %d, want %d", tt.s, tt.sep, num, tt.num)
- }
- }
- }
- var cutTests = []struct {
- s, sep string
- before, after string
- found bool
- }{
- {"abc", "b", "a", "c", true},
- {"abc", "a", "", "bc", true},
- {"abc", "c", "ab", "", true},
- {"abc", "abc", "", "", true},
- {"abc", "", "", "abc", true},
- {"abc", "d", "abc", "", false},
- {"", "d", "", "", false},
- {"", "", "", "", true},
- }
- func TestCut(t *testing.T) {
- for _, tt := range cutTests {
- if before, after, found := Cut(tt.s, tt.sep); before != tt.before || after != tt.after || found != tt.found {
- t.Errorf("Cut(%q, %q) = %q, %q, %v, want %q, %q, %v", tt.s, tt.sep, before, after, found, tt.before, tt.after, tt.found)
- }
- }
- }
- 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("#", 2048) // Never matches set
- cs := "0123456789abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz"
- for k := 1; k <= 2048; k <<= 4 {
- for j := 1; j <= 64; 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 BenchmarkIndexAnyUTF8(b *testing.B) {
- x := Repeat("#", 2048) // Never matches set
- cs := "你好世界, hello world. 你好世界, hello world. 你好世界, hello world."
- for k := 1; k <= 2048; k <<= 4 {
- for j := 1; j <= 64; 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 BenchmarkLastIndexAnyASCII(b *testing.B) {
- x := Repeat("#", 2048) // Never matches set
- cs := "0123456789abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz"
- for k := 1; k <= 2048; k <<= 4 {
- for j := 1; j <= 64; j <<= 1 {
- b.Run(fmt.Sprintf("%d:%d", k, j), func(b *testing.B) {
- for i := 0; i < b.N; i++ {
- LastIndexAny(x[:k], cs[:j])
- }
- })
- }
- }
- }
- func BenchmarkLastIndexAnyUTF8(b *testing.B) {
- x := Repeat("#", 2048) // Never matches set
- cs := "你好世界, hello world. 你好世界, hello world. 你好世界, hello world."
- for k := 1; k <= 2048; k <<= 4 {
- for j := 1; j <= 64; j <<= 1 {
- b.Run(fmt.Sprintf("%d:%d", k, j), func(b *testing.B) {
- for i := 0; i < b.N; i++ {
- LastIndexAny(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 BenchmarkTrimByte(b *testing.B) {
- x := " the quick brown fox "
- for i := 0; i < b.N; i++ {
- Trim(x, " ")
- }
- }
- 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)
- }
- })
- }
- }
- var stringSink string
- func BenchmarkReplaceAll(b *testing.B) {
- b.ReportAllocs()
- for i := 0; i < b.N; i++ {
- stringSink = ReplaceAll("banana", "a", "<>")
- }
- }
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