From f6ad4dcef54c5ce997a4bad5a6d86de229015700 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Tue, 16 Apr 2024 21:25:22 +0200 Subject: Adding upstream version 1.22.1. Signed-off-by: Daniel Baumann --- src/regexp/all_test.go | 975 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 975 insertions(+) create mode 100644 src/regexp/all_test.go (limited to 'src/regexp/all_test.go') diff --git a/src/regexp/all_test.go b/src/regexp/all_test.go new file mode 100644 index 0000000..124313d --- /dev/null +++ b/src/regexp/all_test.go @@ -0,0 +1,975 @@ +// 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 regexp + +import ( + "reflect" + "regexp/syntax" + "strings" + "testing" + "unicode/utf8" +) + +var goodRe = []string{ + ``, + `.`, + `^.$`, + `a`, + `a*`, + `a+`, + `a?`, + `a|b`, + `a*|b*`, + `(a*|b)(c*|d)`, + `[a-z]`, + `[a-abc-c\-\]\[]`, + `[a-z]+`, + `[abc]`, + `[^1234]`, + `[^\n]`, + `\!\\`, +} + +type stringError struct { + re string + err string +} + +var badRe = []stringError{ + {`*`, "missing argument to repetition operator: `*`"}, + {`+`, "missing argument to repetition operator: `+`"}, + {`?`, "missing argument to repetition operator: `?`"}, + {`(abc`, "missing closing ): `(abc`"}, + {`abc)`, "unexpected ): `abc)`"}, + {`x[a-z`, "missing closing ]: `[a-z`"}, + {`[z-a]`, "invalid character class range: `z-a`"}, + {`abc\`, "trailing backslash at end of expression"}, + {`a**`, "invalid nested repetition operator: `**`"}, + {`a*+`, "invalid nested repetition operator: `*+`"}, + {`\x`, "invalid escape sequence: `\\x`"}, + {strings.Repeat(`\pL`, 27000), "expression too large"}, +} + +func compileTest(t *testing.T, expr string, error string) *Regexp { + re, err := Compile(expr) + if error == "" && err != nil { + t.Error("compiling `", expr, "`; unexpected error: ", err.Error()) + } + if error != "" && err == nil { + t.Error("compiling `", expr, "`; missing error") + } else if error != "" && !strings.Contains(err.Error(), error) { + t.Error("compiling `", expr, "`; wrong error: ", err.Error(), "; want ", error) + } + return re +} + +func TestGoodCompile(t *testing.T) { + for i := 0; i < len(goodRe); i++ { + compileTest(t, goodRe[i], "") + } +} + +func TestBadCompile(t *testing.T) { + for i := 0; i < len(badRe); i++ { + compileTest(t, badRe[i].re, badRe[i].err) + } +} + +func matchTest(t *testing.T, test *FindTest) { + re := compileTest(t, test.pat, "") + if re == nil { + return + } + m := re.MatchString(test.text) + if m != (len(test.matches) > 0) { + t.Errorf("MatchString failure on %s: %t should be %t", test, m, len(test.matches) > 0) + } + // now try bytes + m = re.Match([]byte(test.text)) + if m != (len(test.matches) > 0) { + t.Errorf("Match failure on %s: %t should be %t", test, m, len(test.matches) > 0) + } +} + +func TestMatch(t *testing.T) { + for _, test := range findTests { + matchTest(t, &test) + } +} + +func matchFunctionTest(t *testing.T, test *FindTest) { + m, err := MatchString(test.pat, test.text) + if err == nil { + return + } + if m != (len(test.matches) > 0) { + t.Errorf("Match failure on %s: %t should be %t", test, m, len(test.matches) > 0) + } +} + +func TestMatchFunction(t *testing.T) { + for _, test := range findTests { + matchFunctionTest(t, &test) + } +} + +func copyMatchTest(t *testing.T, test *FindTest) { + re := compileTest(t, test.pat, "") + if re == nil { + return + } + m1 := re.MatchString(test.text) + m2 := re.Copy().MatchString(test.text) + if m1 != m2 { + t.Errorf("Copied Regexp match failure on %s: original gave %t; copy gave %t; should be %t", + test, m1, m2, len(test.matches) > 0) + } +} + +func TestCopyMatch(t *testing.T) { + for _, test := range findTests { + copyMatchTest(t, &test) + } +} + +type ReplaceTest struct { + pattern, replacement, input, output string +} + +var replaceTests = []ReplaceTest{ + // Test empty input and/or replacement, with pattern that matches the empty string. + {"", "", "", ""}, + {"", "x", "", "x"}, + {"", "", "abc", "abc"}, + {"", "x", "abc", "xaxbxcx"}, + + // Test empty input and/or replacement, with pattern that does not match the empty string. + {"b", "", "", ""}, + {"b", "x", "", ""}, + {"b", "", "abc", "ac"}, + {"b", "x", "abc", "axc"}, + {"y", "", "", ""}, + {"y", "x", "", ""}, + {"y", "", "abc", "abc"}, + {"y", "x", "abc", "abc"}, + + // Multibyte characters -- verify that we don't try to match in the middle + // of a character. + {"[a-c]*", "x", "\u65e5", "x\u65e5x"}, + {"[^\u65e5]", "x", "abc\u65e5def", "xxx\u65e5xxx"}, + + // Start and end of a string. + {"^[a-c]*", "x", "abcdabc", "xdabc"}, + {"[a-c]*$", "x", "abcdabc", "abcdx"}, + {"^[a-c]*$", "x", "abcdabc", "abcdabc"}, + {"^[a-c]*", "x", "abc", "x"}, + {"[a-c]*$", "x", "abc", "x"}, + {"^[a-c]*$", "x", "abc", "x"}, + {"^[a-c]*", "x", "dabce", "xdabce"}, + {"[a-c]*$", "x", "dabce", "dabcex"}, + {"^[a-c]*$", "x", "dabce", "dabce"}, + {"^[a-c]*", "x", "", "x"}, + {"[a-c]*$", "x", "", "x"}, + {"^[a-c]*$", "x", "", "x"}, + + {"^[a-c]+", "x", "abcdabc", "xdabc"}, + {"[a-c]+$", "x", "abcdabc", "abcdx"}, + {"^[a-c]+$", "x", "abcdabc", "abcdabc"}, + {"^[a-c]+", "x", "abc", "x"}, + {"[a-c]+$", "x", "abc", "x"}, + {"^[a-c]+$", "x", "abc", "x"}, + {"^[a-c]+", "x", "dabce", "dabce"}, + {"[a-c]+$", "x", "dabce", "dabce"}, + {"^[a-c]+$", "x", "dabce", "dabce"}, + {"^[a-c]+", "x", "", ""}, + {"[a-c]+$", "x", "", ""}, + {"^[a-c]+$", "x", "", ""}, + + // Other cases. + {"abc", "def", "abcdefg", "defdefg"}, + {"bc", "BC", "abcbcdcdedef", "aBCBCdcdedef"}, + {"abc", "", "abcdabc", "d"}, + {"x", "xXx", "xxxXxxx", "xXxxXxxXxXxXxxXxxXx"}, + {"abc", "d", "", ""}, + {"abc", "d", "abc", "d"}, + {".+", "x", "abc", "x"}, + {"[a-c]*", "x", "def", "xdxexfx"}, + {"[a-c]+", "x", "abcbcdcdedef", "xdxdedef"}, + {"[a-c]*", "x", "abcbcdcdedef", "xdxdxexdxexfx"}, + + // Substitutions + {"a+", "($0)", "banana", "b(a)n(a)n(a)"}, + {"a+", "(${0})", "banana", "b(a)n(a)n(a)"}, + {"a+", "(${0})$0", "banana", "b(a)an(a)an(a)a"}, + {"a+", "(${0})$0", "banana", "b(a)an(a)an(a)a"}, + {"hello, (.+)", "goodbye, ${1}", "hello, world", "goodbye, world"}, + {"hello, (.+)", "goodbye, $1x", "hello, world", "goodbye, "}, + {"hello, (.+)", "goodbye, ${1}x", "hello, world", "goodbye, worldx"}, + {"hello, (.+)", "<$0><$1><$2><$3>", "hello, world", "<><>"}, + {"hello, (?P.+)", "goodbye, $noun!", "hello, world", "goodbye, world!"}, + {"hello, (?P.+)", "goodbye, ${noun}", "hello, world", "goodbye, world"}, + {"(?Phi)|(?Pbye)", "$x$x$x", "hi", "hihihi"}, + {"(?Phi)|(?Pbye)", "$x$x$x", "bye", "byebyebye"}, + {"(?Phi)|(?Pbye)", "$xyz", "hi", ""}, + {"(?Phi)|(?Pbye)", "${x}yz", "hi", "hiyz"}, + {"(?Phi)|(?Pbye)", "hello $$x", "hi", "hello $x"}, + {"a+", "${oops", "aaa", "${oops"}, + {"a+", "$$", "aaa", "$"}, + {"a+", "$", "aaa", "$"}, + + // Substitution when subexpression isn't found + {"(x)?", "$1", "123", "123"}, + {"abc", "$1", "123", "123"}, + + // Substitutions involving a (x){0} + {"(a)(b){0}(c)", ".$1|$3.", "xacxacx", "x.a|c.x.a|c.x"}, + {"(a)(((b))){0}c", ".$1.", "xacxacx", "x.a.x.a.x"}, + {"((a(b){0}){3}){5}(h)", "y caramb$2", "say aaaaaaaaaaaaaaaah", "say ay caramba"}, + {"((a(b){0}){3}){5}h", "y caramb$2", "say aaaaaaaaaaaaaaaah", "say ay caramba"}, +} + +var replaceLiteralTests = []ReplaceTest{ + // Substitutions + {"a+", "($0)", "banana", "b($0)n($0)n($0)"}, + {"a+", "(${0})", "banana", "b(${0})n(${0})n(${0})"}, + {"a+", "(${0})$0", "banana", "b(${0})$0n(${0})$0n(${0})$0"}, + {"a+", "(${0})$0", "banana", "b(${0})$0n(${0})$0n(${0})$0"}, + {"hello, (.+)", "goodbye, ${1}", "hello, world", "goodbye, ${1}"}, + {"hello, (?P.+)", "goodbye, $noun!", "hello, world", "goodbye, $noun!"}, + {"hello, (?P.+)", "goodbye, ${noun}", "hello, world", "goodbye, ${noun}"}, + {"(?Phi)|(?Pbye)", "$x$x$x", "hi", "$x$x$x"}, + {"(?Phi)|(?Pbye)", "$x$x$x", "bye", "$x$x$x"}, + {"(?Phi)|(?Pbye)", "$xyz", "hi", "$xyz"}, + {"(?Phi)|(?Pbye)", "${x}yz", "hi", "${x}yz"}, + {"(?Phi)|(?Pbye)", "hello $$x", "hi", "hello $$x"}, + {"a+", "${oops", "aaa", "${oops"}, + {"a+", "$$", "aaa", "$$"}, + {"a+", "$", "aaa", "$"}, +} + +type ReplaceFuncTest struct { + pattern string + replacement func(string) string + input, output string +} + +var replaceFuncTests = []ReplaceFuncTest{ + {"[a-c]", func(s string) string { return "x" + s + "y" }, "defabcdef", "defxayxbyxcydef"}, + {"[a-c]+", func(s string) string { return "x" + s + "y" }, "defabcdef", "defxabcydef"}, + {"[a-c]*", func(s string) string { return "x" + s + "y" }, "defabcdef", "xydxyexyfxabcydxyexyfxy"}, +} + +func TestReplaceAll(t *testing.T) { + for _, tc := range replaceTests { + re, err := Compile(tc.pattern) + if err != nil { + t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err) + continue + } + actual := re.ReplaceAllString(tc.input, tc.replacement) + if actual != tc.output { + t.Errorf("%q.ReplaceAllString(%q,%q) = %q; want %q", + tc.pattern, tc.input, tc.replacement, actual, tc.output) + } + // now try bytes + actual = string(re.ReplaceAll([]byte(tc.input), []byte(tc.replacement))) + if actual != tc.output { + t.Errorf("%q.ReplaceAll(%q,%q) = %q; want %q", + tc.pattern, tc.input, tc.replacement, actual, tc.output) + } + } +} + +func TestReplaceAllLiteral(t *testing.T) { + // Run ReplaceAll tests that do not have $ expansions. + for _, tc := range replaceTests { + if strings.Contains(tc.replacement, "$") { + continue + } + re, err := Compile(tc.pattern) + if err != nil { + t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err) + continue + } + actual := re.ReplaceAllLiteralString(tc.input, tc.replacement) + if actual != tc.output { + t.Errorf("%q.ReplaceAllLiteralString(%q,%q) = %q; want %q", + tc.pattern, tc.input, tc.replacement, actual, tc.output) + } + // now try bytes + actual = string(re.ReplaceAllLiteral([]byte(tc.input), []byte(tc.replacement))) + if actual != tc.output { + t.Errorf("%q.ReplaceAllLiteral(%q,%q) = %q; want %q", + tc.pattern, tc.input, tc.replacement, actual, tc.output) + } + } + + // Run literal-specific tests. + for _, tc := range replaceLiteralTests { + re, err := Compile(tc.pattern) + if err != nil { + t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err) + continue + } + actual := re.ReplaceAllLiteralString(tc.input, tc.replacement) + if actual != tc.output { + t.Errorf("%q.ReplaceAllLiteralString(%q,%q) = %q; want %q", + tc.pattern, tc.input, tc.replacement, actual, tc.output) + } + // now try bytes + actual = string(re.ReplaceAllLiteral([]byte(tc.input), []byte(tc.replacement))) + if actual != tc.output { + t.Errorf("%q.ReplaceAllLiteral(%q,%q) = %q; want %q", + tc.pattern, tc.input, tc.replacement, actual, tc.output) + } + } +} + +func TestReplaceAllFunc(t *testing.T) { + for _, tc := range replaceFuncTests { + re, err := Compile(tc.pattern) + if err != nil { + t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err) + continue + } + actual := re.ReplaceAllStringFunc(tc.input, tc.replacement) + if actual != tc.output { + t.Errorf("%q.ReplaceFunc(%q,fn) = %q; want %q", + tc.pattern, tc.input, actual, tc.output) + } + // now try bytes + actual = string(re.ReplaceAllFunc([]byte(tc.input), func(s []byte) []byte { return []byte(tc.replacement(string(s))) })) + if actual != tc.output { + t.Errorf("%q.ReplaceFunc(%q,fn) = %q; want %q", + tc.pattern, tc.input, actual, tc.output) + } + } +} + +type MetaTest struct { + pattern, output, literal string + isLiteral bool +} + +var metaTests = []MetaTest{ + {``, ``, ``, true}, + {`foo`, `foo`, `foo`, true}, + {`日本語+`, `日本語\+`, `日本語`, false}, + {`foo\.\$`, `foo\\\.\\\$`, `foo.$`, true}, // has meta but no operator + {`foo.\$`, `foo\.\\\$`, `foo`, false}, // has escaped operators and real operators + {`!@#$%^&*()_+-=[{]}\|,<.>/?~`, `!@#\$%\^&\*\(\)_\+-=\[\{\]\}\\\|,<\.>/\?~`, `!@#`, false}, +} + +var literalPrefixTests = []MetaTest{ + // See golang.org/issue/11175. + // output is unused. + {`^0^0$`, ``, `0`, false}, + {`^0^`, ``, ``, false}, + {`^0$`, ``, `0`, true}, + {`$0^`, ``, ``, false}, + {`$0$`, ``, ``, false}, + {`^^0$$`, ``, ``, false}, + {`^$^$`, ``, ``, false}, + {`$$0^^`, ``, ``, false}, + {`a\x{fffd}b`, ``, `a`, false}, + {`\x{fffd}b`, ``, ``, false}, + {"\ufffd", ``, ``, false}, +} + +func TestQuoteMeta(t *testing.T) { + for _, tc := range metaTests { + // Verify that QuoteMeta returns the expected string. + quoted := QuoteMeta(tc.pattern) + if quoted != tc.output { + t.Errorf("QuoteMeta(`%s`) = `%s`; want `%s`", + tc.pattern, quoted, tc.output) + continue + } + + // Verify that the quoted string is in fact treated as expected + // by Compile -- i.e. that it matches the original, unquoted string. + if tc.pattern != "" { + re, err := Compile(quoted) + if err != nil { + t.Errorf("Unexpected error compiling QuoteMeta(`%s`): %v", tc.pattern, err) + continue + } + src := "abc" + tc.pattern + "def" + repl := "xyz" + replaced := re.ReplaceAllString(src, repl) + expected := "abcxyzdef" + if replaced != expected { + t.Errorf("QuoteMeta(`%s`).Replace(`%s`,`%s`) = `%s`; want `%s`", + tc.pattern, src, repl, replaced, expected) + } + } + } +} + +func TestLiteralPrefix(t *testing.T) { + for _, tc := range append(metaTests, literalPrefixTests...) { + // Literal method needs to scan the pattern. + re := MustCompile(tc.pattern) + str, complete := re.LiteralPrefix() + if complete != tc.isLiteral { + t.Errorf("LiteralPrefix(`%s`) = %t; want %t", tc.pattern, complete, tc.isLiteral) + } + if str != tc.literal { + t.Errorf("LiteralPrefix(`%s`) = `%s`; want `%s`", tc.pattern, str, tc.literal) + } + } +} + +type subexpIndex struct { + name string + index int +} + +type subexpCase struct { + input string + num int + names []string + indices []subexpIndex +} + +var emptySubexpIndices = []subexpIndex{{"", -1}, {"missing", -1}} + +var subexpCases = []subexpCase{ + {``, 0, nil, emptySubexpIndices}, + {`.*`, 0, nil, emptySubexpIndices}, + {`abba`, 0, nil, emptySubexpIndices}, + {`ab(b)a`, 1, []string{"", ""}, emptySubexpIndices}, + {`ab(.*)a`, 1, []string{"", ""}, emptySubexpIndices}, + {`(.*)ab(.*)a`, 2, []string{"", "", ""}, emptySubexpIndices}, + {`(.*)(ab)(.*)a`, 3, []string{"", "", "", ""}, emptySubexpIndices}, + {`(.*)((a)b)(.*)a`, 4, []string{"", "", "", "", ""}, emptySubexpIndices}, + {`(.*)(\(ab)(.*)a`, 3, []string{"", "", "", ""}, emptySubexpIndices}, + {`(.*)(\(a\)b)(.*)a`, 3, []string{"", "", "", ""}, emptySubexpIndices}, + {`(?P.*)(?P(a)b)(?P.*)a`, 4, []string{"", "foo", "bar", "", "foo"}, []subexpIndex{{"", -1}, {"missing", -1}, {"foo", 1}, {"bar", 2}}}, +} + +func TestSubexp(t *testing.T) { + for _, c := range subexpCases { + re := MustCompile(c.input) + n := re.NumSubexp() + if n != c.num { + t.Errorf("%q: NumSubexp = %d, want %d", c.input, n, c.num) + continue + } + names := re.SubexpNames() + if len(names) != 1+n { + t.Errorf("%q: len(SubexpNames) = %d, want %d", c.input, len(names), n) + continue + } + if c.names != nil { + for i := 0; i < 1+n; i++ { + if names[i] != c.names[i] { + t.Errorf("%q: SubexpNames[%d] = %q, want %q", c.input, i, names[i], c.names[i]) + } + } + } + for _, subexp := range c.indices { + index := re.SubexpIndex(subexp.name) + if index != subexp.index { + t.Errorf("%q: SubexpIndex(%q) = %d, want %d", c.input, subexp.name, index, subexp.index) + } + } + } +} + +var splitTests = []struct { + s string + r string + n int + out []string +}{ + {"foo:and:bar", ":", -1, []string{"foo", "and", "bar"}}, + {"foo:and:bar", ":", 1, []string{"foo:and:bar"}}, + {"foo:and:bar", ":", 2, []string{"foo", "and:bar"}}, + {"foo:and:bar", "foo", -1, []string{"", ":and:bar"}}, + {"foo:and:bar", "bar", -1, []string{"foo:and:", ""}}, + {"foo:and:bar", "baz", -1, []string{"foo:and:bar"}}, + {"baabaab", "a", -1, []string{"b", "", "b", "", "b"}}, + {"baabaab", "a*", -1, []string{"b", "b", "b"}}, + {"baabaab", "ba*", -1, []string{"", "", "", ""}}, + {"foobar", "f*b*", -1, []string{"", "o", "o", "a", "r"}}, + {"foobar", "f+.*b+", -1, []string{"", "ar"}}, + {"foobooboar", "o{2}", -1, []string{"f", "b", "boar"}}, + {"a,b,c,d,e,f", ",", 3, []string{"a", "b", "c,d,e,f"}}, + {"a,b,c,d,e,f", ",", 0, nil}, + {",", ",", -1, []string{"", ""}}, + {",,,", ",", -1, []string{"", "", "", ""}}, + {"", ",", -1, []string{""}}, + {"", ".*", -1, []string{""}}, + {"", ".+", -1, []string{""}}, + {"", "", -1, []string{}}, + {"foobar", "", -1, []string{"f", "o", "o", "b", "a", "r"}}, + {"abaabaccadaaae", "a*", 5, []string{"", "b", "b", "c", "cadaaae"}}, + {":x:y:z:", ":", -1, []string{"", "x", "y", "z", ""}}, +} + +func TestSplit(t *testing.T) { + for i, test := range splitTests { + re, err := Compile(test.r) + if err != nil { + t.Errorf("#%d: %q: compile error: %s", i, test.r, err.Error()) + continue + } + + split := re.Split(test.s, test.n) + if !reflect.DeepEqual(split, test.out) { + t.Errorf("#%d: %q: got %q; want %q", i, test.r, split, test.out) + } + + if QuoteMeta(test.r) == test.r { + strsplit := strings.SplitN(test.s, test.r, test.n) + if !reflect.DeepEqual(split, strsplit) { + t.Errorf("#%d: Split(%q, %q, %d): regexp vs strings mismatch\nregexp=%q\nstrings=%q", i, test.s, test.r, test.n, split, strsplit) + } + } + } +} + +// The following sequence of Match calls used to panic. See issue #12980. +func TestParseAndCompile(t *testing.T) { + expr := "a$" + s := "a\nb" + + for i, tc := range []struct { + reFlags syntax.Flags + expMatch bool + }{ + {syntax.Perl | syntax.OneLine, false}, + {syntax.Perl &^ syntax.OneLine, true}, + } { + parsed, err := syntax.Parse(expr, tc.reFlags) + if err != nil { + t.Fatalf("%d: parse: %v", i, err) + } + re, err := Compile(parsed.String()) + if err != nil { + t.Fatalf("%d: compile: %v", i, err) + } + if match := re.MatchString(s); match != tc.expMatch { + t.Errorf("%d: %q.MatchString(%q)=%t; expected=%t", i, re, s, match, tc.expMatch) + } + } +} + +// Check that one-pass cutoff does trigger. +func TestOnePassCutoff(t *testing.T) { + re, err := syntax.Parse(`^x{1,1000}y{1,1000}$`, syntax.Perl) + if err != nil { + t.Fatalf("parse: %v", err) + } + p, err := syntax.Compile(re.Simplify()) + if err != nil { + t.Fatalf("compile: %v", err) + } + if compileOnePass(p) != nil { + t.Fatalf("makeOnePass succeeded; wanted nil") + } +} + +// Check that the same machine can be used with the standard matcher +// and then the backtracker when there are no captures. +func TestSwitchBacktrack(t *testing.T) { + re := MustCompile(`a|b`) + long := make([]byte, maxBacktrackVector+1) + + // The following sequence of Match calls used to panic. See issue #10319. + re.Match(long) // triggers standard matcher + re.Match(long[:1]) // triggers backtracker +} + +func BenchmarkFind(b *testing.B) { + b.StopTimer() + re := MustCompile("a+b+") + wantSubs := "aaabb" + s := []byte("acbb" + wantSubs + "dd") + b.StartTimer() + b.ReportAllocs() + for i := 0; i < b.N; i++ { + subs := re.Find(s) + if string(subs) != wantSubs { + b.Fatalf("Find(%q) = %q; want %q", s, subs, wantSubs) + } + } +} + +func BenchmarkFindAllNoMatches(b *testing.B) { + re := MustCompile("a+b+") + s := []byte("acddee") + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + all := re.FindAll(s, -1) + if all != nil { + b.Fatalf("FindAll(%q) = %q; want nil", s, all) + } + } +} + +func BenchmarkFindString(b *testing.B) { + b.StopTimer() + re := MustCompile("a+b+") + wantSubs := "aaabb" + s := "acbb" + wantSubs + "dd" + b.StartTimer() + b.ReportAllocs() + for i := 0; i < b.N; i++ { + subs := re.FindString(s) + if subs != wantSubs { + b.Fatalf("FindString(%q) = %q; want %q", s, subs, wantSubs) + } + } +} + +func BenchmarkFindSubmatch(b *testing.B) { + b.StopTimer() + re := MustCompile("a(a+b+)b") + wantSubs := "aaabb" + s := []byte("acbb" + wantSubs + "dd") + b.StartTimer() + b.ReportAllocs() + for i := 0; i < b.N; i++ { + subs := re.FindSubmatch(s) + if string(subs[0]) != wantSubs { + b.Fatalf("FindSubmatch(%q)[0] = %q; want %q", s, subs[0], wantSubs) + } + if string(subs[1]) != "aab" { + b.Fatalf("FindSubmatch(%q)[1] = %q; want %q", s, subs[1], "aab") + } + } +} + +func BenchmarkFindStringSubmatch(b *testing.B) { + b.StopTimer() + re := MustCompile("a(a+b+)b") + wantSubs := "aaabb" + s := "acbb" + wantSubs + "dd" + b.StartTimer() + b.ReportAllocs() + for i := 0; i < b.N; i++ { + subs := re.FindStringSubmatch(s) + if subs[0] != wantSubs { + b.Fatalf("FindStringSubmatch(%q)[0] = %q; want %q", s, subs[0], wantSubs) + } + if subs[1] != "aab" { + b.Fatalf("FindStringSubmatch(%q)[1] = %q; want %q", s, subs[1], "aab") + } + } +} + +func BenchmarkLiteral(b *testing.B) { + x := strings.Repeat("x", 50) + "y" + b.StopTimer() + re := MustCompile("y") + b.StartTimer() + for i := 0; i < b.N; i++ { + if !re.MatchString(x) { + b.Fatalf("no match!") + } + } +} + +func BenchmarkNotLiteral(b *testing.B) { + x := strings.Repeat("x", 50) + "y" + b.StopTimer() + re := MustCompile(".y") + b.StartTimer() + for i := 0; i < b.N; i++ { + if !re.MatchString(x) { + b.Fatalf("no match!") + } + } +} + +func BenchmarkMatchClass(b *testing.B) { + b.StopTimer() + x := strings.Repeat("xxxx", 20) + "w" + re := MustCompile("[abcdw]") + b.StartTimer() + for i := 0; i < b.N; i++ { + if !re.MatchString(x) { + b.Fatalf("no match!") + } + } +} + +func BenchmarkMatchClass_InRange(b *testing.B) { + b.StopTimer() + // 'b' is between 'a' and 'c', so the charclass + // range checking is no help here. + x := strings.Repeat("bbbb", 20) + "c" + re := MustCompile("[ac]") + b.StartTimer() + for i := 0; i < b.N; i++ { + if !re.MatchString(x) { + b.Fatalf("no match!") + } + } +} + +func BenchmarkReplaceAll(b *testing.B) { + x := "abcdefghijklmnopqrstuvwxyz" + b.StopTimer() + re := MustCompile("[cjrw]") + b.StartTimer() + for i := 0; i < b.N; i++ { + re.ReplaceAllString(x, "") + } +} + +func BenchmarkAnchoredLiteralShortNonMatch(b *testing.B) { + b.StopTimer() + x := []byte("abcdefghijklmnopqrstuvwxyz") + re := MustCompile("^zbc(d|e)") + b.StartTimer() + for i := 0; i < b.N; i++ { + re.Match(x) + } +} + +func BenchmarkAnchoredLiteralLongNonMatch(b *testing.B) { + b.StopTimer() + x := []byte("abcdefghijklmnopqrstuvwxyz") + for i := 0; i < 15; i++ { + x = append(x, x...) + } + re := MustCompile("^zbc(d|e)") + b.StartTimer() + for i := 0; i < b.N; i++ { + re.Match(x) + } +} + +func BenchmarkAnchoredShortMatch(b *testing.B) { + b.StopTimer() + x := []byte("abcdefghijklmnopqrstuvwxyz") + re := MustCompile("^.bc(d|e)") + b.StartTimer() + for i := 0; i < b.N; i++ { + re.Match(x) + } +} + +func BenchmarkAnchoredLongMatch(b *testing.B) { + b.StopTimer() + x := []byte("abcdefghijklmnopqrstuvwxyz") + for i := 0; i < 15; i++ { + x = append(x, x...) + } + re := MustCompile("^.bc(d|e)") + b.StartTimer() + for i := 0; i < b.N; i++ { + re.Match(x) + } +} + +func BenchmarkOnePassShortA(b *testing.B) { + b.StopTimer() + x := []byte("abcddddddeeeededd") + re := MustCompile("^.bc(d|e)*$") + b.StartTimer() + for i := 0; i < b.N; i++ { + re.Match(x) + } +} + +func BenchmarkNotOnePassShortA(b *testing.B) { + b.StopTimer() + x := []byte("abcddddddeeeededd") + re := MustCompile(".bc(d|e)*$") + b.StartTimer() + for i := 0; i < b.N; i++ { + re.Match(x) + } +} + +func BenchmarkOnePassShortB(b *testing.B) { + b.StopTimer() + x := []byte("abcddddddeeeededd") + re := MustCompile("^.bc(?:d|e)*$") + b.StartTimer() + for i := 0; i < b.N; i++ { + re.Match(x) + } +} + +func BenchmarkNotOnePassShortB(b *testing.B) { + b.StopTimer() + x := []byte("abcddddddeeeededd") + re := MustCompile(".bc(?:d|e)*$") + b.StartTimer() + for i := 0; i < b.N; i++ { + re.Match(x) + } +} + +func BenchmarkOnePassLongPrefix(b *testing.B) { + b.StopTimer() + x := []byte("abcdefghijklmnopqrstuvwxyz") + re := MustCompile("^abcdefghijklmnopqrstuvwxyz.*$") + b.StartTimer() + for i := 0; i < b.N; i++ { + re.Match(x) + } +} + +func BenchmarkOnePassLongNotPrefix(b *testing.B) { + b.StopTimer() + x := []byte("abcdefghijklmnopqrstuvwxyz") + re := MustCompile("^.bcdefghijklmnopqrstuvwxyz.*$") + b.StartTimer() + for i := 0; i < b.N; i++ { + re.Match(x) + } +} + +func BenchmarkMatchParallelShared(b *testing.B) { + x := []byte("this is a long line that contains foo bar baz") + re := MustCompile("foo (ba+r)? baz") + b.ResetTimer() + b.RunParallel(func(pb *testing.PB) { + for pb.Next() { + re.Match(x) + } + }) +} + +func BenchmarkMatchParallelCopied(b *testing.B) { + x := []byte("this is a long line that contains foo bar baz") + re := MustCompile("foo (ba+r)? baz") + b.ResetTimer() + b.RunParallel(func(pb *testing.PB) { + re := re.Copy() + for pb.Next() { + re.Match(x) + } + }) +} + +var sink string + +func BenchmarkQuoteMetaAll(b *testing.B) { + specials := make([]byte, 0) + for i := byte(0); i < utf8.RuneSelf; i++ { + if special(i) { + specials = append(specials, i) + } + } + s := string(specials) + b.SetBytes(int64(len(s))) + b.ResetTimer() + for i := 0; i < b.N; i++ { + sink = QuoteMeta(s) + } +} + +func BenchmarkQuoteMetaNone(b *testing.B) { + s := "abcdefghijklmnopqrstuvwxyz" + b.SetBytes(int64(len(s))) + b.ResetTimer() + for i := 0; i < b.N; i++ { + sink = QuoteMeta(s) + } +} + +var compileBenchData = []struct{ name, re string }{ + {"Onepass", `^a.[l-nA-Cg-j]?e$`}, + {"Medium", `^((a|b|[d-z0-9])*(日){4,5}.)+$`}, + {"Hard", strings.Repeat(`((abc)*|`, 50) + strings.Repeat(`)`, 50)}, +} + +func BenchmarkCompile(b *testing.B) { + for _, data := range compileBenchData { + b.Run(data.name, func(b *testing.B) { + b.ReportAllocs() + for i := 0; i < b.N; i++ { + if _, err := Compile(data.re); err != nil { + b.Fatal(err) + } + } + }) + } +} + +func TestDeepEqual(t *testing.T) { + re1 := MustCompile("a.*b.*c.*d") + re2 := MustCompile("a.*b.*c.*d") + if !reflect.DeepEqual(re1, re2) { // has always been true, since Go 1. + t.Errorf("DeepEqual(re1, re2) = false, want true") + } + + re1.MatchString("abcdefghijklmn") + if !reflect.DeepEqual(re1, re2) { + t.Errorf("DeepEqual(re1, re2) = false, want true") + } + + re2.MatchString("abcdefghijklmn") + if !reflect.DeepEqual(re1, re2) { + t.Errorf("DeepEqual(re1, re2) = false, want true") + } + + re2.MatchString(strings.Repeat("abcdefghijklmn", 100)) + if !reflect.DeepEqual(re1, re2) { + t.Errorf("DeepEqual(re1, re2) = false, want true") + } +} + +var minInputLenTests = []struct { + Regexp string + min int +}{ + {``, 0}, + {`a`, 1}, + {`aa`, 2}, + {`(aa)a`, 3}, + {`(?:aa)a`, 3}, + {`a?a`, 1}, + {`(aaa)|(aa)`, 2}, + {`(aa)+a`, 3}, + {`(aa)*a`, 1}, + {`(aa){3,5}`, 6}, + {`[a-z]`, 1}, + {`日`, 3}, +} + +func TestMinInputLen(t *testing.T) { + for _, tt := range minInputLenTests { + re, _ := syntax.Parse(tt.Regexp, syntax.Perl) + m := minInputLen(re) + if m != tt.min { + t.Errorf("regexp %#q has minInputLen %d, should be %d", tt.Regexp, m, tt.min) + } + } +} + +func TestUnmarshalText(t *testing.T) { + unmarshaled := new(Regexp) + for i := range goodRe { + re := compileTest(t, goodRe[i], "") + marshaled, err := re.MarshalText() + if err != nil { + t.Errorf("regexp %#q failed to marshal: %s", re, err) + continue + } + if err := unmarshaled.UnmarshalText(marshaled); err != nil { + t.Errorf("regexp %#q failed to unmarshal: %s", re, err) + continue + } + if unmarshaled.String() != goodRe[i] { + t.Errorf("UnmarshalText returned unexpected value: %s", unmarshaled.String()) + } + } + t.Run("invalid pattern", func(t *testing.T) { + re := new(Regexp) + err := re.UnmarshalText([]byte(`\`)) + if err == nil { + t.Error("unexpected success") + } + }) +} -- cgit v1.2.3