581 lines
16 KiB
Go
581 lines
16 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package regexp
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import (
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"reflect"
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"strings"
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"testing"
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)
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var good_re = []string{
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``,
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`.`,
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`^.$`,
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`a`,
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`a*`,
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`a+`,
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`a?`,
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`a|b`,
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`a*|b*`,
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`(a*|b)(c*|d)`,
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`[a-z]`,
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`[a-abc-c\-\]\[]`,
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`[a-z]+`,
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`[abc]`,
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`[^1234]`,
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`[^\n]`,
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`\!\\`,
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}
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type stringError struct {
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re string
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err string
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}
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var bad_re = []stringError{
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{`*`, "missing argument to repetition operator: `*`"},
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{`+`, "missing argument to repetition operator: `+`"},
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{`?`, "missing argument to repetition operator: `?`"},
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{`(abc`, "missing closing ): `(abc`"},
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{`abc)`, "unexpected ): `abc)`"},
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{`x[a-z`, "missing closing ]: `[a-z`"},
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{`[z-a]`, "invalid character class range: `z-a`"},
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{`abc\`, "trailing backslash at end of expression"},
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{`a**`, "invalid nested repetition operator: `**`"},
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{`a*+`, "invalid nested repetition operator: `*+`"},
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{`\x`, "invalid escape sequence: `\\x`"},
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}
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func compileTest(t *testing.T, expr string, error string) *Regexp {
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re, err := Compile(expr)
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if error == "" && err != nil {
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t.Error("compiling `", expr, "`; unexpected error: ", err.Error())
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}
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if error != "" && err == nil {
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t.Error("compiling `", expr, "`; missing error")
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} else if error != "" && !strings.Contains(err.Error(), error) {
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t.Error("compiling `", expr, "`; wrong error: ", err.Error(), "; want ", error)
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}
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return re
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}
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func TestGoodCompile(t *testing.T) {
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for i := 0; i < len(good_re); i++ {
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compileTest(t, good_re[i], "")
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}
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}
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func TestBadCompile(t *testing.T) {
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for i := 0; i < len(bad_re); i++ {
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compileTest(t, bad_re[i].re, bad_re[i].err)
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}
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}
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func matchTest(t *testing.T, test *FindTest) {
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re := compileTest(t, test.pat, "")
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if re == nil {
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return
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}
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m := re.MatchString(test.text)
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if m != (len(test.matches) > 0) {
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t.Errorf("MatchString failure on %s: %t should be %t", test, m, len(test.matches) > 0)
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}
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// now try bytes
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m = re.Match([]byte(test.text))
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if m != (len(test.matches) > 0) {
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t.Errorf("Match failure on %s: %t should be %t", test, m, len(test.matches) > 0)
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}
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}
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func TestMatch(t *testing.T) {
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for _, test := range findTests {
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matchTest(t, &test)
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}
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}
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func matchFunctionTest(t *testing.T, test *FindTest) {
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m, err := MatchString(test.pat, test.text)
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if err == nil {
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return
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}
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if m != (len(test.matches) > 0) {
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t.Errorf("Match failure on %s: %t should be %t", test, m, len(test.matches) > 0)
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}
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}
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func TestMatchFunction(t *testing.T) {
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for _, test := range findTests {
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matchFunctionTest(t, &test)
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}
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}
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type ReplaceTest struct {
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pattern, replacement, input, output string
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}
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var replaceTests = []ReplaceTest{
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// Test empty input and/or replacement, with pattern that matches the empty string.
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{"", "", "", ""},
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{"", "x", "", "x"},
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{"", "", "abc", "abc"},
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{"", "x", "abc", "xaxbxcx"},
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// Test empty input and/or replacement, with pattern that does not match the empty string.
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{"b", "", "", ""},
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{"b", "x", "", ""},
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{"b", "", "abc", "ac"},
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{"b", "x", "abc", "axc"},
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{"y", "", "", ""},
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{"y", "x", "", ""},
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{"y", "", "abc", "abc"},
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{"y", "x", "abc", "abc"},
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// Multibyte characters -- verify that we don't try to match in the middle
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// of a character.
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{"[a-c]*", "x", "\u65e5", "x\u65e5x"},
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{"[^\u65e5]", "x", "abc\u65e5def", "xxx\u65e5xxx"},
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// Start and end of a string.
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{"^[a-c]*", "x", "abcdabc", "xdabc"},
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{"[a-c]*$", "x", "abcdabc", "abcdx"},
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{"^[a-c]*$", "x", "abcdabc", "abcdabc"},
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{"^[a-c]*", "x", "abc", "x"},
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{"[a-c]*$", "x", "abc", "x"},
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{"^[a-c]*$", "x", "abc", "x"},
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{"^[a-c]*", "x", "dabce", "xdabce"},
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{"[a-c]*$", "x", "dabce", "dabcex"},
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{"^[a-c]*$", "x", "dabce", "dabce"},
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{"^[a-c]*", "x", "", "x"},
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{"[a-c]*$", "x", "", "x"},
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{"^[a-c]*$", "x", "", "x"},
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{"^[a-c]+", "x", "abcdabc", "xdabc"},
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{"[a-c]+$", "x", "abcdabc", "abcdx"},
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{"^[a-c]+$", "x", "abcdabc", "abcdabc"},
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{"^[a-c]+", "x", "abc", "x"},
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{"[a-c]+$", "x", "abc", "x"},
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{"^[a-c]+$", "x", "abc", "x"},
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{"^[a-c]+", "x", "dabce", "dabce"},
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{"[a-c]+$", "x", "dabce", "dabce"},
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{"^[a-c]+$", "x", "dabce", "dabce"},
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{"^[a-c]+", "x", "", ""},
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{"[a-c]+$", "x", "", ""},
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{"^[a-c]+$", "x", "", ""},
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// Other cases.
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{"abc", "def", "abcdefg", "defdefg"},
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{"bc", "BC", "abcbcdcdedef", "aBCBCdcdedef"},
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{"abc", "", "abcdabc", "d"},
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{"x", "xXx", "xxxXxxx", "xXxxXxxXxXxXxxXxxXx"},
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{"abc", "d", "", ""},
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{"abc", "d", "abc", "d"},
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{".+", "x", "abc", "x"},
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{"[a-c]*", "x", "def", "xdxexfx"},
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{"[a-c]+", "x", "abcbcdcdedef", "xdxdedef"},
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{"[a-c]*", "x", "abcbcdcdedef", "xdxdxexdxexfx"},
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// Substitutions
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{"a+", "($0)", "banana", "b(a)n(a)n(a)"},
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{"a+", "(${0})", "banana", "b(a)n(a)n(a)"},
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{"a+", "(${0})$0", "banana", "b(a)an(a)an(a)a"},
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{"a+", "(${0})$0", "banana", "b(a)an(a)an(a)a"},
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{"hello, (.+)", "goodbye, ${1}", "hello, world", "goodbye, world"},
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{"hello, (.+)", "goodbye, $1x", "hello, world", "goodbye, "},
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{"hello, (.+)", "goodbye, ${1}x", "hello, world", "goodbye, worldx"},
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{"hello, (.+)", "<$0><$1><$2><$3>", "hello, world", "<hello, world><world><><>"},
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{"hello, (?P<noun>.+)", "goodbye, $noun!", "hello, world", "goodbye, world!"},
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{"hello, (?P<noun>.+)", "goodbye, ${noun}", "hello, world", "goodbye, world"},
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{"(?P<x>hi)|(?P<x>bye)", "$x$x$x", "hi", "hihihi"},
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{"(?P<x>hi)|(?P<x>bye)", "$x$x$x", "bye", "byebyebye"},
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{"(?P<x>hi)|(?P<x>bye)", "$xyz", "hi", ""},
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{"(?P<x>hi)|(?P<x>bye)", "${x}yz", "hi", "hiyz"},
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{"(?P<x>hi)|(?P<x>bye)", "hello $$x", "hi", "hello $x"},
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{"a+", "${oops", "aaa", "${oops"},
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{"a+", "$$", "aaa", "$"},
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{"a+", "$", "aaa", "$"},
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// Substitution when subexpression isn't found
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{"(x)?", "$1", "123", "123"},
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{"abc", "$1", "123", "123"},
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}
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var replaceLiteralTests = []ReplaceTest{
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// Substitutions
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{"a+", "($0)", "banana", "b($0)n($0)n($0)"},
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{"a+", "(${0})", "banana", "b(${0})n(${0})n(${0})"},
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{"a+", "(${0})$0", "banana", "b(${0})$0n(${0})$0n(${0})$0"},
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{"a+", "(${0})$0", "banana", "b(${0})$0n(${0})$0n(${0})$0"},
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{"hello, (.+)", "goodbye, ${1}", "hello, world", "goodbye, ${1}"},
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{"hello, (?P<noun>.+)", "goodbye, $noun!", "hello, world", "goodbye, $noun!"},
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{"hello, (?P<noun>.+)", "goodbye, ${noun}", "hello, world", "goodbye, ${noun}"},
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{"(?P<x>hi)|(?P<x>bye)", "$x$x$x", "hi", "$x$x$x"},
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{"(?P<x>hi)|(?P<x>bye)", "$x$x$x", "bye", "$x$x$x"},
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{"(?P<x>hi)|(?P<x>bye)", "$xyz", "hi", "$xyz"},
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{"(?P<x>hi)|(?P<x>bye)", "${x}yz", "hi", "${x}yz"},
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{"(?P<x>hi)|(?P<x>bye)", "hello $$x", "hi", "hello $$x"},
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{"a+", "${oops", "aaa", "${oops"},
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{"a+", "$$", "aaa", "$$"},
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{"a+", "$", "aaa", "$"},
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}
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type ReplaceFuncTest struct {
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pattern string
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replacement func(string) string
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input, output string
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}
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var replaceFuncTests = []ReplaceFuncTest{
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{"[a-c]", func(s string) string { return "x" + s + "y" }, "defabcdef", "defxayxbyxcydef"},
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{"[a-c]+", func(s string) string { return "x" + s + "y" }, "defabcdef", "defxabcydef"},
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{"[a-c]*", func(s string) string { return "x" + s + "y" }, "defabcdef", "xydxyexyfxabcydxyexyfxy"},
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}
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func TestReplaceAll(t *testing.T) {
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for _, tc := range replaceTests {
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re, err := Compile(tc.pattern)
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if err != nil {
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t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err)
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continue
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}
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actual := re.ReplaceAllString(tc.input, tc.replacement)
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if actual != tc.output {
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t.Errorf("%q.ReplaceAllString(%q,%q) = %q; want %q",
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tc.pattern, tc.input, tc.replacement, actual, tc.output)
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}
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// now try bytes
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actual = string(re.ReplaceAll([]byte(tc.input), []byte(tc.replacement)))
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if actual != tc.output {
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t.Errorf("%q.ReplaceAll(%q,%q) = %q; want %q",
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tc.pattern, tc.input, tc.replacement, actual, tc.output)
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}
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}
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}
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func TestReplaceAllLiteral(t *testing.T) {
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// Run ReplaceAll tests that do not have $ expansions.
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for _, tc := range replaceTests {
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if strings.Contains(tc.replacement, "$") {
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continue
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}
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re, err := Compile(tc.pattern)
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if err != nil {
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t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err)
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continue
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}
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actual := re.ReplaceAllLiteralString(tc.input, tc.replacement)
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if actual != tc.output {
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t.Errorf("%q.ReplaceAllLiteralString(%q,%q) = %q; want %q",
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tc.pattern, tc.input, tc.replacement, actual, tc.output)
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}
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// now try bytes
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actual = string(re.ReplaceAllLiteral([]byte(tc.input), []byte(tc.replacement)))
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if actual != tc.output {
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t.Errorf("%q.ReplaceAllLiteral(%q,%q) = %q; want %q",
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tc.pattern, tc.input, tc.replacement, actual, tc.output)
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}
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}
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// Run literal-specific tests.
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for _, tc := range replaceLiteralTests {
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re, err := Compile(tc.pattern)
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if err != nil {
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t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err)
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continue
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}
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actual := re.ReplaceAllLiteralString(tc.input, tc.replacement)
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if actual != tc.output {
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t.Errorf("%q.ReplaceAllLiteralString(%q,%q) = %q; want %q",
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tc.pattern, tc.input, tc.replacement, actual, tc.output)
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}
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// now try bytes
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actual = string(re.ReplaceAllLiteral([]byte(tc.input), []byte(tc.replacement)))
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if actual != tc.output {
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t.Errorf("%q.ReplaceAllLiteral(%q,%q) = %q; want %q",
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tc.pattern, tc.input, tc.replacement, actual, tc.output)
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}
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}
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}
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func TestReplaceAllFunc(t *testing.T) {
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for _, tc := range replaceFuncTests {
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re, err := Compile(tc.pattern)
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if err != nil {
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t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err)
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continue
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}
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actual := re.ReplaceAllStringFunc(tc.input, tc.replacement)
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if actual != tc.output {
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t.Errorf("%q.ReplaceFunc(%q,fn) = %q; want %q",
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tc.pattern, tc.input, actual, tc.output)
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}
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// now try bytes
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actual = string(re.ReplaceAllFunc([]byte(tc.input), func(s []byte) []byte { return []byte(tc.replacement(string(s))) }))
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if actual != tc.output {
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t.Errorf("%q.ReplaceFunc(%q,fn) = %q; want %q",
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tc.pattern, tc.input, actual, tc.output)
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}
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}
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}
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type MetaTest struct {
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pattern, output, literal string
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isLiteral bool
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}
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var metaTests = []MetaTest{
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{``, ``, ``, true},
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{`foo`, `foo`, `foo`, true},
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{`foo\.\$`, `foo\\\.\\\$`, `foo.$`, true}, // has meta but no operator
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{`foo.\$`, `foo\.\\\$`, `foo`, false}, // has escaped operators and real operators
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{`!@#$%^&*()_+-=[{]}\|,<.>/?~`, `!@#\$%\^&\*\(\)_\+-=\[\{\]\}\\\|,<\.>/\?~`, `!@#`, false},
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}
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func TestQuoteMeta(t *testing.T) {
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for _, tc := range metaTests {
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// Verify that QuoteMeta returns the expected string.
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quoted := QuoteMeta(tc.pattern)
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if quoted != tc.output {
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t.Errorf("QuoteMeta(`%s`) = `%s`; want `%s`",
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tc.pattern, quoted, tc.output)
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continue
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}
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// Verify that the quoted string is in fact treated as expected
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// by Compile -- i.e. that it matches the original, unquoted string.
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if tc.pattern != "" {
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re, err := Compile(quoted)
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if err != nil {
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t.Errorf("Unexpected error compiling QuoteMeta(`%s`): %v", tc.pattern, err)
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continue
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}
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src := "abc" + tc.pattern + "def"
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repl := "xyz"
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replaced := re.ReplaceAllString(src, repl)
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expected := "abcxyzdef"
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if replaced != expected {
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t.Errorf("QuoteMeta(`%s`).Replace(`%s`,`%s`) = `%s`; want `%s`",
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tc.pattern, src, repl, replaced, expected)
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}
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}
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}
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}
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func TestLiteralPrefix(t *testing.T) {
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for _, tc := range metaTests {
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// Literal method needs to scan the pattern.
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re := MustCompile(tc.pattern)
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str, complete := re.LiteralPrefix()
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if complete != tc.isLiteral {
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t.Errorf("LiteralPrefix(`%s`) = %t; want %t", tc.pattern, complete, tc.isLiteral)
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}
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if str != tc.literal {
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t.Errorf("LiteralPrefix(`%s`) = `%s`; want `%s`", tc.pattern, str, tc.literal)
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}
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}
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}
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type subexpCase struct {
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input string
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num int
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names []string
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}
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var subexpCases = []subexpCase{
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{``, 0, nil},
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{`.*`, 0, nil},
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{`abba`, 0, nil},
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{`ab(b)a`, 1, []string{"", ""}},
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{`ab(.*)a`, 1, []string{"", ""}},
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{`(.*)ab(.*)a`, 2, []string{"", "", ""}},
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{`(.*)(ab)(.*)a`, 3, []string{"", "", "", ""}},
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{`(.*)((a)b)(.*)a`, 4, []string{"", "", "", "", ""}},
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{`(.*)(\(ab)(.*)a`, 3, []string{"", "", "", ""}},
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{`(.*)(\(a\)b)(.*)a`, 3, []string{"", "", "", ""}},
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{`(?P<foo>.*)(?P<bar>(a)b)(?P<foo>.*)a`, 4, []string{"", "foo", "bar", "", "foo"}},
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}
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func TestSubexp(t *testing.T) {
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for _, c := range subexpCases {
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re := MustCompile(c.input)
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n := re.NumSubexp()
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if n != c.num {
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t.Errorf("%q: NumSubexp = %d, want %d", c.input, n, c.num)
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continue
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}
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names := re.SubexpNames()
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if len(names) != 1+n {
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t.Errorf("%q: len(SubexpNames) = %d, want %d", c.input, len(names), n)
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continue
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}
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if c.names != nil {
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for i := 0; i < 1+n; i++ {
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if names[i] != c.names[i] {
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t.Errorf("%q: SubexpNames[%d] = %q, want %q", c.input, i, names[i], c.names[i])
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}
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}
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}
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}
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}
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var splitTests = []struct {
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s string
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r string
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n int
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out []string
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}{
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{"foo:and:bar", ":", -1, []string{"foo", "and", "bar"}},
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{"foo:and:bar", ":", 1, []string{"foo:and:bar"}},
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{"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)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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)
|
|
}
|
|
}
|