// 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" . "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}, } 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 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{}}, {" 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{"™", "™"}}, {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{ {"", ""}, {"abc", "ABC"}, {"AbC123", "ABC123"}, {"azAZ09_", "AZAZ09_"}, {"\u0250\u0250\u0250\u0250\u0250", "\u2C6F\u2C6F\u2C6F\u2C6F\u2C6F"}, // grows one byte per char } var lowerTests = []StringTest{ {"", ""}, {"abc", "abc"}, {"AbC123", "abc123"}, {"azAZ09_", "azaz09_"}, {"\u2C6D\u2C6D\u2C6D\u2C6D\u2C6D", "\u0251\u0251\u0251\u0251\u0251"}, // shrinks one byte per char } 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") } } func TestToUpper(t *testing.T) { runStringTests(t, ToUpper, "ToUpper", upperTests) } func TestToLower(t *testing.T) { runStringTests(t, ToLower, "ToLower", lowerTests) } 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"}, {"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) } } } } 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, out string }{ {isSpace, space + " hello " + space, "hello"}, {isDigit, "\u0e50\u0e5212hello34\u0e50\u0e51", "hello"}, {isUpper, "\u2C6F\u2C6F\u2C6F\u2C6FABCDhelloEF\u2C6F\u2C6FGH\u2C6F\u2C6F", "hello"}, {not(isSpace), "hello" + space + "hello", space}, {not(isDigit), "hello\u0e50\u0e521234\u0e50\u0e51helo", "\u0e50\u0e521234\u0e50\u0e51"}, {isValidRune, "ab\xc0a\xc0cd", "\xc0a\xc0"}, {not(isValidRune), "\xc0a\xc0", "a"}, } func TestTrimFunc(t *testing.T) { for _, tc := range trimFuncTests { actual := TrimFunc(tc.in, tc.f.f) if actual != tc.out { t.Errorf("TrimFunc(%q, %q) = %q; want %q", tc.in, tc.f.name, actual, tc.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", "", -1, "ada"}, {"", "", "<>", -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) } } } 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}, } 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) } } } 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{ "", "

", "", "", "", "

", "", "", "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, "") } func BenchmarkIndexHard3(b *testing.B) { benchmarkIndexHard(b, "hello world") } func BenchmarkIndexHard4(b *testing.B) { benchmarkIndexHard(b, "
helloworld
") } func BenchmarkLastIndexHard1(b *testing.B) { benchmarkLastIndexHard(b, "<>") } func BenchmarkLastIndexHard2(b *testing.B) { benchmarkLastIndexHard(b, "") } func BenchmarkLastIndexHard3(b *testing.B) { benchmarkLastIndexHard(b, "hello world") } func BenchmarkCountHard1(b *testing.B) { benchmarkCountHard(b, "<>") } func BenchmarkCountHard2(b *testing.B) { benchmarkCountHard(b, "") } func BenchmarkCountHard3(b *testing.B) { benchmarkCountHard(b, "hello world") } 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) } } 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 fieldsInput = makeFieldsInput() func BenchmarkFields(b *testing.B) { b.SetBytes(int64(len(fieldsInput))) for i := 0; i < b.N; i++ { Fields(fieldsInput) } } func BenchmarkFieldsFunc(b *testing.B) { b.SetBytes(int64(len(fieldsInput))) for i := 0; i < b.N; i++ { FieldsFunc(fieldsInput, unicode.IsSpace) } } func BenchmarkSplit1(b *testing.B) { for i := 0; i < b.N; i++ { Split(benchInputHard, "") } } func BenchmarkSplit2(b *testing.B) { for i := 0; i < b.N; i++ { Split(benchInputHard, "/") } } func BenchmarkSplit3(b *testing.B) { for i := 0; i < b.N; i++ { Split(benchInputHard, "hello") } } func BenchmarkRepeat(b *testing.B) { for i := 0; i < b.N; i++ { Repeat("-", 80) } } 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]) } }) } } }