350 lines
9 KiB
Go
350 lines
9 KiB
Go
// 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"
|
||
)
|
||
|
||
var parseTests = []struct {
|
||
Regexp string
|
||
Dump string
|
||
}{
|
||
// 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}}`},
|
||
{``, `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 0x180e 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 0x180e 0x2000-0x200a 0x2028-0x2029 0x202f 0x205f 0x3000}`},
|
||
{`\p{Lu}`, mkCharClass(unicode.IsUpper)},
|
||
{`[\p{Lu}]`, mkCharClass(unicode.IsUpper)},
|
||
{`(?i)[\p{Lu}]`, mkCharClass(isUpperFold)},
|
||
|
||
// 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}}}}`},
|
||
}
|
||
|
||
const testFlags = MatchNL | PerlX | UnicodeGroups
|
||
|
||
// Test Parse -> Dump.
|
||
func TestParseDump(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)
|
||
}
|
||
}
|
||
}
|
||
|
||
// 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(int) bool) string {
|
||
re := &Regexp{Op: OpCharClass}
|
||
lo := -1
|
||
for i := 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(rune int) bool {
|
||
if unicode.IsUpper(rune) {
|
||
return true
|
||
}
|
||
c := unicode.SimpleFold(rune)
|
||
for c != rune {
|
||
if unicode.IsUpper(c) {
|
||
return true
|
||
}
|
||
c = unicode.SimpleFold(c)
|
||
}
|
||
return false
|
||
}
|
||
|
||
func TestFoldConstants(t *testing.T) {
|
||
last := -1
|
||
for i := 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 []int
|
||
for i := '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))
|
||
}
|
||
}
|