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-rw-r--r--src/regexp/syntax/parse_test.go559
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diff --git a/src/regexp/syntax/parse_test.go b/src/regexp/syntax/parse_test.go
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+++ b/src/regexp/syntax/parse_test.go
@@ -0,0 +1,559 @@
+// Copyright 2011 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 syntax
+
+import (
+ "bytes"
+ "fmt"
+ "testing"
+ "unicode"
+)
+
+type parseTest struct {
+ Regexp string
+ Dump string
+}
+
+var parseTests = []parseTest{
+ // Base cases
+ {`a`, `lit{a}`},
+ {`a.`, `cat{lit{a}dot{}}`},
+ {`a.b`, `cat{lit{a}dot{}lit{b}}`},
+ {`ab`, `str{ab}`},
+ {`a.b.c`, `cat{lit{a}dot{}lit{b}dot{}lit{c}}`},
+ {`abc`, `str{abc}`},
+ {`a|^`, `alt{lit{a}bol{}}`},
+ {`a|b`, `cc{0x61-0x62}`},
+ {`(a)`, `cap{lit{a}}`},
+ {`(a)|b`, `alt{cap{lit{a}}lit{b}}`},
+ {`a*`, `star{lit{a}}`},
+ {`a+`, `plus{lit{a}}`},
+ {`a?`, `que{lit{a}}`},
+ {`a{2}`, `rep{2,2 lit{a}}`},
+ {`a{2,3}`, `rep{2,3 lit{a}}`},
+ {`a{2,}`, `rep{2,-1 lit{a}}`},
+ {`a*?`, `nstar{lit{a}}`},
+ {`a+?`, `nplus{lit{a}}`},
+ {`a??`, `nque{lit{a}}`},
+ {`a{2}?`, `nrep{2,2 lit{a}}`},
+ {`a{2,3}?`, `nrep{2,3 lit{a}}`},
+ {`a{2,}?`, `nrep{2,-1 lit{a}}`},
+ // Malformed { } are treated as literals.
+ {`x{1001`, `str{x{1001}`},
+ {`x{9876543210`, `str{x{9876543210}`},
+ {`x{9876543210,`, `str{x{9876543210,}`},
+ {`x{2,1`, `str{x{2,1}`},
+ {`x{1,9876543210`, `str{x{1,9876543210}`},
+ {``, `emp{}`},
+ {`|`, `emp{}`}, // alt{emp{}emp{}} but got factored
+ {`|x|`, `alt{emp{}lit{x}emp{}}`},
+ {`.`, `dot{}`},
+ {`^`, `bol{}`},
+ {`$`, `eol{}`},
+ {`\|`, `lit{|}`},
+ {`\(`, `lit{(}`},
+ {`\)`, `lit{)}`},
+ {`\*`, `lit{*}`},
+ {`\+`, `lit{+}`},
+ {`\?`, `lit{?}`},
+ {`{`, `lit{{}`},
+ {`}`, `lit{}}`},
+ {`\.`, `lit{.}`},
+ {`\^`, `lit{^}`},
+ {`\$`, `lit{$}`},
+ {`\\`, `lit{\}`},
+ {`[ace]`, `cc{0x61 0x63 0x65}`},
+ {`[abc]`, `cc{0x61-0x63}`},
+ {`[a-z]`, `cc{0x61-0x7a}`},
+ {`[a]`, `lit{a}`},
+ {`\-`, `lit{-}`},
+ {`-`, `lit{-}`},
+ {`\_`, `lit{_}`},
+ {`abc`, `str{abc}`},
+ {`abc|def`, `alt{str{abc}str{def}}`},
+ {`abc|def|ghi`, `alt{str{abc}str{def}str{ghi}}`},
+
+ // Posix and Perl extensions
+ {`[[:lower:]]`, `cc{0x61-0x7a}`},
+ {`[a-z]`, `cc{0x61-0x7a}`},
+ {`[^[:lower:]]`, `cc{0x0-0x60 0x7b-0x10ffff}`},
+ {`[[:^lower:]]`, `cc{0x0-0x60 0x7b-0x10ffff}`},
+ {`(?i)[[:lower:]]`, `cc{0x41-0x5a 0x61-0x7a 0x17f 0x212a}`},
+ {`(?i)[a-z]`, `cc{0x41-0x5a 0x61-0x7a 0x17f 0x212a}`},
+ {`(?i)[^[:lower:]]`, `cc{0x0-0x40 0x5b-0x60 0x7b-0x17e 0x180-0x2129 0x212b-0x10ffff}`},
+ {`(?i)[[:^lower:]]`, `cc{0x0-0x40 0x5b-0x60 0x7b-0x17e 0x180-0x2129 0x212b-0x10ffff}`},
+ {`\d`, `cc{0x30-0x39}`},
+ {`\D`, `cc{0x0-0x2f 0x3a-0x10ffff}`},
+ {`\s`, `cc{0x9-0xa 0xc-0xd 0x20}`},
+ {`\S`, `cc{0x0-0x8 0xb 0xe-0x1f 0x21-0x10ffff}`},
+ {`\w`, `cc{0x30-0x39 0x41-0x5a 0x5f 0x61-0x7a}`},
+ {`\W`, `cc{0x0-0x2f 0x3a-0x40 0x5b-0x5e 0x60 0x7b-0x10ffff}`},
+ {`(?i)\w`, `cc{0x30-0x39 0x41-0x5a 0x5f 0x61-0x7a 0x17f 0x212a}`},
+ {`(?i)\W`, `cc{0x0-0x2f 0x3a-0x40 0x5b-0x5e 0x60 0x7b-0x17e 0x180-0x2129 0x212b-0x10ffff}`},
+ {`[^\\]`, `cc{0x0-0x5b 0x5d-0x10ffff}`},
+ // { `\C`, `byte{}` }, // probably never
+
+ // Unicode, negatives, and a double negative.
+ {`\p{Braille}`, `cc{0x2800-0x28ff}`},
+ {`\P{Braille}`, `cc{0x0-0x27ff 0x2900-0x10ffff}`},
+ {`\p{^Braille}`, `cc{0x0-0x27ff 0x2900-0x10ffff}`},
+ {`\P{^Braille}`, `cc{0x2800-0x28ff}`},
+ {`\pZ`, `cc{0x20 0xa0 0x1680 0x2000-0x200a 0x2028-0x2029 0x202f 0x205f 0x3000}`},
+ {`[\p{Braille}]`, `cc{0x2800-0x28ff}`},
+ {`[\P{Braille}]`, `cc{0x0-0x27ff 0x2900-0x10ffff}`},
+ {`[\p{^Braille}]`, `cc{0x0-0x27ff 0x2900-0x10ffff}`},
+ {`[\P{^Braille}]`, `cc{0x2800-0x28ff}`},
+ {`[\pZ]`, `cc{0x20 0xa0 0x1680 0x2000-0x200a 0x2028-0x2029 0x202f 0x205f 0x3000}`},
+ {`\p{Lu}`, mkCharClass(unicode.IsUpper)},
+ {`[\p{Lu}]`, mkCharClass(unicode.IsUpper)},
+ {`(?i)[\p{Lu}]`, mkCharClass(isUpperFold)},
+ {`\p{Any}`, `dot{}`},
+ {`\p{^Any}`, `cc{}`},
+
+ // Hex, octal.
+ {`[\012-\234]\141`, `cat{cc{0xa-0x9c}lit{a}}`},
+ {`[\x{41}-\x7a]\x61`, `cat{cc{0x41-0x7a}lit{a}}`},
+
+ // More interesting regular expressions.
+ {`a{,2}`, `str{a{,2}}`},
+ {`\.\^\$\\`, `str{.^$\}`},
+ {`[a-zABC]`, `cc{0x41-0x43 0x61-0x7a}`},
+ {`[^a]`, `cc{0x0-0x60 0x62-0x10ffff}`},
+ {`[α-ε☺]`, `cc{0x3b1-0x3b5 0x263a}`}, // utf-8
+ {`a*{`, `cat{star{lit{a}}lit{{}}`},
+
+ // Test precedences
+ {`(?:ab)*`, `star{str{ab}}`},
+ {`(ab)*`, `star{cap{str{ab}}}`},
+ {`ab|cd`, `alt{str{ab}str{cd}}`},
+ {`a(b|c)d`, `cat{lit{a}cap{cc{0x62-0x63}}lit{d}}`},
+
+ // Test flattening.
+ {`(?:a)`, `lit{a}`},
+ {`(?:ab)(?:cd)`, `str{abcd}`},
+ {`(?:a+b+)(?:c+d+)`, `cat{plus{lit{a}}plus{lit{b}}plus{lit{c}}plus{lit{d}}}`},
+ {`(?:a+|b+)|(?:c+|d+)`, `alt{plus{lit{a}}plus{lit{b}}plus{lit{c}}plus{lit{d}}}`},
+ {`(?:a|b)|(?:c|d)`, `cc{0x61-0x64}`},
+ {`a|.`, `dot{}`},
+ {`.|a`, `dot{}`},
+ {`(?:[abc]|A|Z|hello|world)`, `alt{cc{0x41 0x5a 0x61-0x63}str{hello}str{world}}`},
+ {`(?:[abc]|A|Z)`, `cc{0x41 0x5a 0x61-0x63}`},
+
+ // Test Perl quoted literals
+ {`\Q+|*?{[\E`, `str{+|*?{[}`},
+ {`\Q+\E+`, `plus{lit{+}}`},
+ {`\Q\\E`, `lit{\}`},
+ {`\Q\\\E`, `str{\\}`},
+
+ // Test Perl \A and \z
+ {`(?m)^`, `bol{}`},
+ {`(?m)$`, `eol{}`},
+ {`(?-m)^`, `bot{}`},
+ {`(?-m)$`, `eot{}`},
+ {`(?m)\A`, `bot{}`},
+ {`(?m)\z`, `eot{\z}`},
+ {`(?-m)\A`, `bot{}`},
+ {`(?-m)\z`, `eot{\z}`},
+
+ // Test named captures
+ {`(?P<name>a)`, `cap{name:lit{a}}`},
+
+ // Case-folded literals
+ {`[Aa]`, `litfold{A}`},
+ {`[\x{100}\x{101}]`, `litfold{Ā}`},
+ {`[Δδ]`, `litfold{Δ}`},
+
+ // Strings
+ {`abcde`, `str{abcde}`},
+ {`[Aa][Bb]cd`, `cat{strfold{AB}str{cd}}`},
+
+ // Factoring.
+ {`abc|abd|aef|bcx|bcy`, `alt{cat{lit{a}alt{cat{lit{b}cc{0x63-0x64}}str{ef}}}cat{str{bc}cc{0x78-0x79}}}`},
+ {`ax+y|ax+z|ay+w`, `cat{lit{a}alt{cat{plus{lit{x}}cc{0x79-0x7a}}cat{plus{lit{y}}lit{w}}}}`},
+
+ // Bug fixes.
+ {`(?:.)`, `dot{}`},
+ {`(?:x|(?:xa))`, `cat{lit{x}alt{emp{}lit{a}}}`},
+ {`(?:.|(?:.a))`, `cat{dot{}alt{emp{}lit{a}}}`},
+ {`(?:A(?:A|a))`, `cat{lit{A}litfold{A}}`},
+ {`(?:A|a)`, `litfold{A}`},
+ {`A|(?:A|a)`, `litfold{A}`},
+ {`(?s).`, `dot{}`},
+ {`(?-s).`, `dnl{}`},
+ {`(?:(?:^).)`, `cat{bol{}dot{}}`},
+ {`(?-s)(?:(?:^).)`, `cat{bol{}dnl{}}`},
+
+ // RE2 prefix_tests
+ {`abc|abd`, `cat{str{ab}cc{0x63-0x64}}`},
+ {`a(?:b)c|abd`, `cat{str{ab}cc{0x63-0x64}}`},
+ {`abc|abd|aef|bcx|bcy`,
+ `alt{cat{lit{a}alt{cat{lit{b}cc{0x63-0x64}}str{ef}}}` +
+ `cat{str{bc}cc{0x78-0x79}}}`},
+ {`abc|x|abd`, `alt{str{abc}lit{x}str{abd}}`},
+ {`(?i)abc|ABD`, `cat{strfold{AB}cc{0x43-0x44 0x63-0x64}}`},
+ {`[ab]c|[ab]d`, `cat{cc{0x61-0x62}cc{0x63-0x64}}`},
+ {`(?:xx|yy)c|(?:xx|yy)d`,
+ `cat{alt{str{xx}str{yy}}cc{0x63-0x64}}`},
+ {`x{2}|x{2}[0-9]`,
+ `cat{rep{2,2 lit{x}}alt{emp{}cc{0x30-0x39}}}`},
+ {`x{2}y|x{2}[0-9]y`,
+ `cat{rep{2,2 lit{x}}alt{lit{y}cat{cc{0x30-0x39}lit{y}}}}`},
+}
+
+const testFlags = MatchNL | PerlX | UnicodeGroups
+
+func TestParseSimple(t *testing.T) {
+ testParseDump(t, parseTests, testFlags)
+}
+
+var foldcaseTests = []parseTest{
+ {`AbCdE`, `strfold{ABCDE}`},
+ {`[Aa]`, `litfold{A}`},
+ {`a`, `litfold{A}`},
+
+ // 0x17F is an old English long s (looks like an f) and folds to s.
+ // 0x212A is the Kelvin symbol and folds to k.
+ {`A[F-g]`, `cat{litfold{A}cc{0x41-0x7a 0x17f 0x212a}}`}, // [Aa][A-z...]
+ {`[[:upper:]]`, `cc{0x41-0x5a 0x61-0x7a 0x17f 0x212a}`},
+ {`[[:lower:]]`, `cc{0x41-0x5a 0x61-0x7a 0x17f 0x212a}`},
+}
+
+func TestParseFoldCase(t *testing.T) {
+ testParseDump(t, foldcaseTests, FoldCase)
+}
+
+var literalTests = []parseTest{
+ {"(|)^$.[*+?]{5,10},\\", "str{(|)^$.[*+?]{5,10},\\}"},
+}
+
+func TestParseLiteral(t *testing.T) {
+ testParseDump(t, literalTests, Literal)
+}
+
+var matchnlTests = []parseTest{
+ {`.`, `dot{}`},
+ {"\n", "lit{\n}"},
+ {`[^a]`, `cc{0x0-0x60 0x62-0x10ffff}`},
+ {`[a\n]`, `cc{0xa 0x61}`},
+}
+
+func TestParseMatchNL(t *testing.T) {
+ testParseDump(t, matchnlTests, MatchNL)
+}
+
+var nomatchnlTests = []parseTest{
+ {`.`, `dnl{}`},
+ {"\n", "lit{\n}"},
+ {`[^a]`, `cc{0x0-0x9 0xb-0x60 0x62-0x10ffff}`},
+ {`[a\n]`, `cc{0xa 0x61}`},
+}
+
+func TestParseNoMatchNL(t *testing.T) {
+ testParseDump(t, nomatchnlTests, 0)
+}
+
+// Test Parse -> Dump.
+func testParseDump(t *testing.T, tests []parseTest, flags Flags) {
+ for _, tt := range tests {
+ re, err := Parse(tt.Regexp, flags)
+ if err != nil {
+ t.Errorf("Parse(%#q): %v", tt.Regexp, err)
+ continue
+ }
+ d := dump(re)
+ if d != tt.Dump {
+ t.Errorf("Parse(%#q).Dump() = %#q want %#q", tt.Regexp, d, tt.Dump)
+ }
+ }
+}
+
+// dump prints a string representation of the regexp showing
+// the structure explicitly.
+func dump(re *Regexp) string {
+ var b bytes.Buffer
+ dumpRegexp(&b, re)
+ return b.String()
+}
+
+var opNames = []string{
+ OpNoMatch: "no",
+ OpEmptyMatch: "emp",
+ OpLiteral: "lit",
+ OpCharClass: "cc",
+ OpAnyCharNotNL: "dnl",
+ OpAnyChar: "dot",
+ OpBeginLine: "bol",
+ OpEndLine: "eol",
+ OpBeginText: "bot",
+ OpEndText: "eot",
+ OpWordBoundary: "wb",
+ OpNoWordBoundary: "nwb",
+ OpCapture: "cap",
+ OpStar: "star",
+ OpPlus: "plus",
+ OpQuest: "que",
+ OpRepeat: "rep",
+ OpConcat: "cat",
+ OpAlternate: "alt",
+}
+
+// dumpRegexp writes an encoding of the syntax tree for the regexp re to b.
+// It is used during testing to distinguish between parses that might print
+// the same using re's String method.
+func dumpRegexp(b *bytes.Buffer, re *Regexp) {
+ if int(re.Op) >= len(opNames) || opNames[re.Op] == "" {
+ fmt.Fprintf(b, "op%d", re.Op)
+ } else {
+ switch re.Op {
+ default:
+ b.WriteString(opNames[re.Op])
+ case OpStar, OpPlus, OpQuest, OpRepeat:
+ if re.Flags&NonGreedy != 0 {
+ b.WriteByte('n')
+ }
+ b.WriteString(opNames[re.Op])
+ case OpLiteral:
+ if len(re.Rune) > 1 {
+ b.WriteString("str")
+ } else {
+ b.WriteString("lit")
+ }
+ if re.Flags&FoldCase != 0 {
+ for _, r := range re.Rune {
+ if unicode.SimpleFold(r) != r {
+ b.WriteString("fold")
+ break
+ }
+ }
+ }
+ }
+ }
+ b.WriteByte('{')
+ switch re.Op {
+ case OpEndText:
+ if re.Flags&WasDollar == 0 {
+ b.WriteString(`\z`)
+ }
+ case OpLiteral:
+ for _, r := range re.Rune {
+ b.WriteRune(r)
+ }
+ case OpConcat, OpAlternate:
+ for _, sub := range re.Sub {
+ dumpRegexp(b, sub)
+ }
+ case OpStar, OpPlus, OpQuest:
+ dumpRegexp(b, re.Sub[0])
+ case OpRepeat:
+ fmt.Fprintf(b, "%d,%d ", re.Min, re.Max)
+ dumpRegexp(b, re.Sub[0])
+ case OpCapture:
+ if re.Name != "" {
+ b.WriteString(re.Name)
+ b.WriteByte(':')
+ }
+ dumpRegexp(b, re.Sub[0])
+ case OpCharClass:
+ sep := ""
+ for i := 0; i < len(re.Rune); i += 2 {
+ b.WriteString(sep)
+ sep = " "
+ lo, hi := re.Rune[i], re.Rune[i+1]
+ if lo == hi {
+ fmt.Fprintf(b, "%#x", lo)
+ } else {
+ fmt.Fprintf(b, "%#x-%#x", lo, hi)
+ }
+ }
+ }
+ b.WriteByte('}')
+}
+
+func mkCharClass(f func(rune) bool) string {
+ re := &Regexp{Op: OpCharClass}
+ lo := rune(-1)
+ for i := rune(0); i <= unicode.MaxRune; i++ {
+ if f(i) {
+ if lo < 0 {
+ lo = i
+ }
+ } else {
+ if lo >= 0 {
+ re.Rune = append(re.Rune, lo, i-1)
+ lo = -1
+ }
+ }
+ }
+ if lo >= 0 {
+ re.Rune = append(re.Rune, lo, unicode.MaxRune)
+ }
+ return dump(re)
+}
+
+func isUpperFold(r rune) bool {
+ if unicode.IsUpper(r) {
+ return true
+ }
+ c := unicode.SimpleFold(r)
+ for c != r {
+ if unicode.IsUpper(c) {
+ return true
+ }
+ c = unicode.SimpleFold(c)
+ }
+ return false
+}
+
+func TestFoldConstants(t *testing.T) {
+ last := rune(-1)
+ for i := rune(0); i <= unicode.MaxRune; i++ {
+ if unicode.SimpleFold(i) == i {
+ continue
+ }
+ if last == -1 && minFold != i {
+ t.Errorf("minFold=%#U should be %#U", minFold, i)
+ }
+ last = i
+ }
+ if maxFold != last {
+ t.Errorf("maxFold=%#U should be %#U", maxFold, last)
+ }
+}
+
+func TestAppendRangeCollapse(t *testing.T) {
+ // AppendRange should collapse each of the new ranges
+ // into the earlier ones (it looks back two ranges), so that
+ // the slice never grows very large.
+ // Note that we are not calling cleanClass.
+ var r []rune
+ for i := rune('A'); i <= 'Z'; i++ {
+ r = appendRange(r, i, i)
+ r = appendRange(r, i+'a'-'A', i+'a'-'A')
+ }
+ if string(r) != "AZaz" {
+ t.Errorf("appendRange interlaced A-Z a-z = %s, want AZaz", string(r))
+ }
+}
+
+var invalidRegexps = []string{
+ `(`,
+ `)`,
+ `(a`,
+ `a)`,
+ `(a))`,
+ `(a|b|`,
+ `a|b|)`,
+ `(a|b|))`,
+ `(a|b`,
+ `a|b)`,
+ `(a|b))`,
+ `[a-z`,
+ `([a-z)`,
+ `[a-z)`,
+ `([a-z]))`,
+ `x{1001}`,
+ `x{9876543210}`,
+ `x{2,1}`,
+ `x{1,9876543210}`,
+ "\xff", // Invalid UTF-8
+ "[\xff]",
+ "[\\\xff]",
+ "\\\xff",
+ `(?P<name>a`,
+ `(?P<name>`,
+ `(?P<name`,
+ `(?P<x y>a)`,
+ `(?P<>a)`,
+ `[a-Z]`,
+ `(?i)[a-Z]`,
+ `a{100000}`,
+ `a{100000,}`,
+}
+
+var onlyPerl = []string{
+ `[a-b-c]`,
+ `\Qabc\E`,
+ `\Q*+?{[\E`,
+ `\Q\\E`,
+ `\Q\\\E`,
+ `\Q\\\\E`,
+ `\Q\\\\\E`,
+ `(?:a)`,
+ `(?P<name>a)`,
+}
+
+var onlyPOSIX = []string{
+ "a++",
+ "a**",
+ "a?*",
+ "a+*",
+ "a{1}*",
+ ".{1}{2}.{3}",
+}
+
+func TestParseInvalidRegexps(t *testing.T) {
+ for _, regexp := range invalidRegexps {
+ if re, err := Parse(regexp, Perl); err == nil {
+ t.Errorf("Parse(%#q, Perl) = %s, should have failed", regexp, dump(re))
+ }
+ if re, err := Parse(regexp, POSIX); err == nil {
+ t.Errorf("Parse(%#q, POSIX) = %s, should have failed", regexp, dump(re))
+ }
+ }
+ for _, regexp := range onlyPerl {
+ if _, err := Parse(regexp, Perl); err != nil {
+ t.Errorf("Parse(%#q, Perl): %v", regexp, err)
+ }
+ if re, err := Parse(regexp, POSIX); err == nil {
+ t.Errorf("Parse(%#q, POSIX) = %s, should have failed", regexp, dump(re))
+ }
+ }
+ for _, regexp := range onlyPOSIX {
+ if re, err := Parse(regexp, Perl); err == nil {
+ t.Errorf("Parse(%#q, Perl) = %s, should have failed", regexp, dump(re))
+ }
+ if _, err := Parse(regexp, POSIX); err != nil {
+ t.Errorf("Parse(%#q, POSIX): %v", regexp, err)
+ }
+ }
+}
+
+func TestToStringEquivalentParse(t *testing.T) {
+ for _, tt := range parseTests {
+ re, err := Parse(tt.Regexp, testFlags)
+ if err != nil {
+ t.Errorf("Parse(%#q): %v", tt.Regexp, err)
+ continue
+ }
+ d := dump(re)
+ if d != tt.Dump {
+ t.Errorf("Parse(%#q).Dump() = %#q want %#q", tt.Regexp, d, tt.Dump)
+ continue
+ }
+
+ s := re.String()
+ if s != tt.Regexp {
+ // If ToString didn't return the original regexp,
+ // it must have found one with fewer parens.
+ // Unfortunately we can't check the length here, because
+ // ToString produces "\\{" for a literal brace,
+ // but "{" is a shorter equivalent in some contexts.
+ nre, err := Parse(s, testFlags)
+ if err != nil {
+ t.Errorf("Parse(%#q.String() = %#q): %v", tt.Regexp, s, err)
+ continue
+ }
+ nd := dump(nre)
+ if d != nd {
+ t.Errorf("Parse(%#q) -> %#q; %#q vs %#q", tt.Regexp, s, d, nd)
+ }
+
+ ns := nre.String()
+ if s != ns {
+ t.Errorf("Parse(%#q) -> %#q -> %#q", tt.Regexp, s, ns)
+ }
+ }
+ }
+}
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