716 lines
20 KiB
Go
716 lines
20 KiB
Go
// Copyright 2010 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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"bufio"
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"compress/bzip2"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"regexp/syntax"
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"strconv"
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"strings"
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"testing"
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"unicode/utf8"
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)
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// TestRE2 tests this package's regexp API against test cases
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// considered during RE2's exhaustive tests, which run all possible
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// regexps over a given set of atoms and operators, up to a given
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// complexity, over all possible strings over a given alphabet,
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// up to a given size. Rather than try to link with RE2, we read a
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// log file containing the test cases and the expected matches.
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// The log file, re2.txt, is generated by running 'make exhaustive-log'
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// in the open source RE2 distribution. http://code.google.com/p/re2/
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//
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// The test file format is a sequence of stanzas like:
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//
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// strings
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// "abc"
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// "123x"
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// regexps
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// "[a-z]+"
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// 0-3;0-3
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// -;-
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// "([0-9])([0-9])([0-9])"
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// -;-
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// -;0-3 0-1 1-2 2-3
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//
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// The stanza begins by defining a set of strings, quoted
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// using Go double-quote syntax, one per line. Then the
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// regexps section gives a sequence of regexps to run on
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// the strings. In the block that follows a regexp, each line
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// gives the semicolon-separated match results of running
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// the regexp on the corresponding string.
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// Each match result is either a single -, meaning no match, or a
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// space-separated sequence of pairs giving the match and
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// submatch indices. An unmatched subexpression formats
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// its pair as a single - (not illustrated above). For now
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// each regexp run produces two match results, one for a
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// ``full match'' that restricts the regexp to matching the entire
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// string or nothing, and one for a ``partial match'' that gives
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// the leftmost first match found in the string.
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//
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// Lines beginning with # are comments. Lines beginning with
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// a capital letter are test names printed during RE2's test suite
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// and are echoed into t but otherwise ignored.
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//
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// At time of writing, re2.txt is 32 MB but compresses to 760 kB,
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// so we store re2.txt.gz in the repository and decompress it on the fly.
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//
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func TestRE2Search(t *testing.T) {
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testRE2(t, "testdata/re2-search.txt")
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}
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func testRE2(t *testing.T, file string) {
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f, err := os.Open(file)
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if err != nil {
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t.Fatal(err)
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}
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defer f.Close()
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var txt io.Reader
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if strings.HasSuffix(file, ".bz2") {
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z := bzip2.NewReader(f)
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txt = z
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file = file[:len(file)-len(".bz2")] // for error messages
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} else {
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txt = f
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}
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lineno := 0
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scanner := bufio.NewScanner(txt)
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var (
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str []string
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input []string
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inStrings bool
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re *Regexp
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refull *Regexp
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nfail int
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ncase int
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)
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for lineno := 1; scanner.Scan(); lineno++ {
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line := scanner.Text()
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switch {
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case line == "":
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t.Fatalf("%s:%d: unexpected blank line", file, lineno)
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case line[0] == '#':
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continue
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case 'A' <= line[0] && line[0] <= 'Z':
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// Test name.
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t.Logf("%s\n", line)
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continue
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case line == "strings":
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str = str[:0]
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inStrings = true
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case line == "regexps":
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inStrings = false
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case line[0] == '"':
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q, err := strconv.Unquote(line)
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if err != nil {
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// Fatal because we'll get out of sync.
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t.Fatalf("%s:%d: unquote %s: %v", file, lineno, line, err)
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}
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if inStrings {
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str = append(str, q)
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continue
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}
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// Is a regexp.
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if len(input) != 0 {
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t.Fatalf("%s:%d: out of sync: have %d strings left before %#q", file, lineno, len(input), q)
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}
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re, err = tryCompile(q)
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if err != nil {
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if err.Error() == "error parsing regexp: invalid escape sequence: `\\C`" {
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// We don't and likely never will support \C; keep going.
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continue
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}
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t.Errorf("%s:%d: compile %#q: %v", file, lineno, q, err)
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if nfail++; nfail >= 100 {
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t.Fatalf("stopping after %d errors", nfail)
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}
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continue
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}
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full := `\A(?:` + q + `)\z`
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refull, err = tryCompile(full)
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if err != nil {
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// Fatal because q worked, so this should always work.
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t.Fatalf("%s:%d: compile full %#q: %v", file, lineno, full, err)
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}
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input = str
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case line[0] == '-' || '0' <= line[0] && line[0] <= '9':
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// A sequence of match results.
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ncase++
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if re == nil {
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// Failed to compile: skip results.
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continue
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}
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if len(input) == 0 {
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t.Fatalf("%s:%d: out of sync: no input remaining", file, lineno)
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}
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var text string
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text, input = input[0], input[1:]
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if !isSingleBytes(text) && strings.Contains(re.String(), `\B`) {
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// RE2's \B considers every byte position,
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// so it sees 'not word boundary' in the
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// middle of UTF-8 sequences. This package
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// only considers the positions between runes,
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// so it disagrees. Skip those cases.
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continue
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}
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res := strings.Split(line, ";")
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if len(res) != len(run) {
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t.Fatalf("%s:%d: have %d test results, want %d", file, lineno, len(res), len(run))
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}
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for i := range res {
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have, suffix := run[i](re, refull, text)
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want := parseResult(t, file, lineno, res[i])
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if !same(have, want) {
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t.Errorf("%s:%d: %#q%s.FindSubmatchIndex(%#q) = %v, want %v", file, lineno, re, suffix, text, have, want)
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if nfail++; nfail >= 100 {
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t.Fatalf("stopping after %d errors", nfail)
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}
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continue
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}
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b, suffix := match[i](re, refull, text)
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if b != (want != nil) {
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t.Errorf("%s:%d: %#q%s.MatchString(%#q) = %v, want %v", file, lineno, re, suffix, text, b, !b)
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if nfail++; nfail >= 100 {
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t.Fatalf("stopping after %d errors", nfail)
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}
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continue
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}
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}
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default:
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t.Fatalf("%s:%d: out of sync: %s\n", file, lineno, line)
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}
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}
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if err := scanner.Err(); err != nil {
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t.Fatalf("%s:%d: %v", file, lineno, err)
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}
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if len(input) != 0 {
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t.Fatalf("%s:%d: out of sync: have %d strings left at EOF", file, lineno, len(input))
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}
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t.Logf("%d cases tested", ncase)
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}
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var run = []func(*Regexp, *Regexp, string) ([]int, string){
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runFull,
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runPartial,
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runFullLongest,
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runPartialLongest,
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}
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func runFull(re, refull *Regexp, text string) ([]int, string) {
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refull.longest = false
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return refull.FindStringSubmatchIndex(text), "[full]"
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}
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func runPartial(re, refull *Regexp, text string) ([]int, string) {
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re.longest = false
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return re.FindStringSubmatchIndex(text), ""
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}
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func runFullLongest(re, refull *Regexp, text string) ([]int, string) {
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refull.longest = true
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return refull.FindStringSubmatchIndex(text), "[full,longest]"
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}
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func runPartialLongest(re, refull *Regexp, text string) ([]int, string) {
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re.longest = true
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return re.FindStringSubmatchIndex(text), "[longest]"
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}
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var match = []func(*Regexp, *Regexp, string) (bool, string){
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matchFull,
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matchPartial,
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matchFullLongest,
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matchPartialLongest,
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}
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func matchFull(re, refull *Regexp, text string) (bool, string) {
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refull.longest = false
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return refull.MatchString(text), "[full]"
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}
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func matchPartial(re, refull *Regexp, text string) (bool, string) {
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re.longest = false
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return re.MatchString(text), ""
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}
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func matchFullLongest(re, refull *Regexp, text string) (bool, string) {
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refull.longest = true
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return refull.MatchString(text), "[full,longest]"
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}
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func matchPartialLongest(re, refull *Regexp, text string) (bool, string) {
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re.longest = true
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return re.MatchString(text), "[longest]"
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}
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func isSingleBytes(s string) bool {
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for _, c := range s {
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if c >= utf8.RuneSelf {
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return false
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}
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}
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return true
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}
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func tryCompile(s string) (re *Regexp, err error) {
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// Protect against panic during Compile.
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defer func() {
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if r := recover(); r != nil {
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err = fmt.Errorf("panic: %v", r)
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}
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}()
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return Compile(s)
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}
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func parseResult(t *testing.T, file string, lineno int, res string) []int {
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// A single - indicates no match.
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if res == "-" {
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return nil
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}
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// Otherwise, a space-separated list of pairs.
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n := 1
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for j := 0; j < len(res); j++ {
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if res[j] == ' ' {
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n++
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}
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}
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out := make([]int, 2*n)
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i := 0
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n = 0
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for j := 0; j <= len(res); j++ {
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if j == len(res) || res[j] == ' ' {
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// Process a single pair. - means no submatch.
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pair := res[i:j]
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if pair == "-" {
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out[n] = -1
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out[n+1] = -1
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} else {
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k := strings.Index(pair, "-")
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if k < 0 {
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t.Fatalf("%s:%d: invalid pair %s", file, lineno, pair)
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}
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lo, err1 := strconv.Atoi(pair[:k])
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hi, err2 := strconv.Atoi(pair[k+1:])
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if err1 != nil || err2 != nil || lo > hi {
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t.Fatalf("%s:%d: invalid pair %s", file, lineno, pair)
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}
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out[n] = lo
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out[n+1] = hi
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}
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n += 2
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i = j + 1
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}
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}
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return out
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}
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func same(x, y []int) bool {
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if len(x) != len(y) {
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return false
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}
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for i, xi := range x {
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if xi != y[i] {
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return false
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}
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}
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return true
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}
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// TestFowler runs this package's regexp API against the
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// POSIX regular expression tests collected by Glenn Fowler
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// at http://www2.research.att.com/~gsf/testregex/.
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func TestFowler(t *testing.T) {
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files, err := filepath.Glob("testdata/*.dat")
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if err != nil {
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t.Fatal(err)
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}
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for _, file := range files {
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t.Log(file)
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testFowler(t, file)
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}
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}
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var notab = MustCompilePOSIX(`[^\t]+`)
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func testFowler(t *testing.T, file string) {
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f, err := os.Open(file)
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if err != nil {
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t.Error(err)
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return
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}
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defer f.Close()
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b := bufio.NewReader(f)
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lineno := 0
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lastRegexp := ""
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Reading:
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for {
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lineno++
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line, err := b.ReadString('\n')
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if err != nil {
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if err != io.EOF {
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t.Errorf("%s:%d: %v", file, lineno, err)
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}
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break Reading
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}
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// http://www2.research.att.com/~gsf/man/man1/testregex.html
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//
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// INPUT FORMAT
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// Input lines may be blank, a comment beginning with #, or a test
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// specification. A specification is five fields separated by one
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// or more tabs. NULL denotes the empty string and NIL denotes the
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// 0 pointer.
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if line[0] == '#' || line[0] == '\n' {
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continue Reading
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}
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line = line[:len(line)-1]
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field := notab.FindAllString(line, -1)
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for i, f := range field {
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if f == "NULL" {
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field[i] = ""
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}
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if f == "NIL" {
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t.Logf("%s:%d: skip: %s", file, lineno, line)
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continue Reading
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}
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}
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if len(field) == 0 {
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continue Reading
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}
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// Field 1: the regex(3) flags to apply, one character per REG_feature
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// flag. The test is skipped if REG_feature is not supported by the
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// implementation. If the first character is not [BEASKLP] then the
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// specification is a global control line. One or more of [BEASKLP] may be
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// specified; the test will be repeated for each mode.
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//
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// B basic BRE (grep, ed, sed)
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// E REG_EXTENDED ERE (egrep)
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// A REG_AUGMENTED ARE (egrep with negation)
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// S REG_SHELL SRE (sh glob)
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// K REG_SHELL|REG_AUGMENTED KRE (ksh glob)
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// L REG_LITERAL LRE (fgrep)
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//
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// a REG_LEFT|REG_RIGHT implicit ^...$
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// b REG_NOTBOL lhs does not match ^
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// c REG_COMMENT ignore space and #...\n
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// d REG_SHELL_DOT explicit leading . match
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// e REG_NOTEOL rhs does not match $
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// f REG_MULTIPLE multiple \n separated patterns
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// g FNM_LEADING_DIR testfnmatch only -- match until /
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// h REG_MULTIREF multiple digit backref
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// i REG_ICASE ignore case
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// j REG_SPAN . matches \n
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// k REG_ESCAPE \ to ecape [...] delimiter
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// l REG_LEFT implicit ^...
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// m REG_MINIMAL minimal match
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// n REG_NEWLINE explicit \n match
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// o REG_ENCLOSED (|&) magic inside [@|&](...)
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// p REG_SHELL_PATH explicit / match
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// q REG_DELIMITED delimited pattern
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// r REG_RIGHT implicit ...$
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// s REG_SHELL_ESCAPED \ not special
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// t REG_MUSTDELIM all delimiters must be specified
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// u standard unspecified behavior -- errors not counted
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// v REG_CLASS_ESCAPE \ special inside [...]
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// w REG_NOSUB no subexpression match array
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// x REG_LENIENT let some errors slide
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// y REG_LEFT regexec() implicit ^...
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// z REG_NULL NULL subexpressions ok
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// $ expand C \c escapes in fields 2 and 3
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// / field 2 is a regsubcomp() expression
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// = field 3 is a regdecomp() expression
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//
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// Field 1 control lines:
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//
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// C set LC_COLLATE and LC_CTYPE to locale in field 2
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//
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// ?test ... output field 5 if passed and != EXPECTED, silent otherwise
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// &test ... output field 5 if current and previous passed
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// |test ... output field 5 if current passed and previous failed
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// ; ... output field 2 if previous failed
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// {test ... skip if failed until }
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// } end of skip
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//
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// : comment comment copied as output NOTE
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// :comment:test :comment: ignored
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// N[OTE] comment comment copied as output NOTE
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// T[EST] comment comment
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//
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// number use number for nmatch (20 by default)
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flag := field[0]
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switch flag[0] {
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case '?', '&', '|', ';', '{', '}':
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// Ignore all the control operators.
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// Just run everything.
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flag = flag[1:]
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if flag == "" {
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continue Reading
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}
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case ':':
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i := strings.Index(flag[1:], ":")
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if i < 0 {
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t.Logf("skip: %s", line)
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continue Reading
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}
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flag = flag[1+i+1:]
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case 'C', 'N', 'T', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
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t.Logf("skip: %s", line)
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continue Reading
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}
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// Can check field count now that we've handled the myriad comment formats.
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if len(field) < 4 {
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t.Errorf("%s:%d: too few fields: %s", file, lineno, line)
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continue Reading
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}
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// Expand C escapes (a.k.a. Go escapes).
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if strings.Contains(flag, "$") {
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f := `"` + field[1] + `"`
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if field[1], err = strconv.Unquote(f); err != nil {
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t.Errorf("%s:%d: cannot unquote %s", file, lineno, f)
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}
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f = `"` + field[2] + `"`
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if field[2], err = strconv.Unquote(f); err != nil {
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t.Errorf("%s:%d: cannot unquote %s", file, lineno, f)
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}
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}
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// Field 2: the regular expression pattern; SAME uses the pattern from
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// the previous specification.
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//
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if field[1] == "SAME" {
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field[1] = lastRegexp
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}
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lastRegexp = field[1]
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// Field 3: the string to match.
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text := field[2]
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// Field 4: the test outcome...
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ok, shouldCompile, shouldMatch, pos := parseFowlerResult(field[3])
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if !ok {
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t.Errorf("%s:%d: cannot parse result %#q", file, lineno, field[3])
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continue Reading
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}
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// Field 5: optional comment appended to the report.
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Testing:
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// Run test once for each specified capital letter mode that we support.
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|
for _, c := range flag {
|
|
pattern := field[1]
|
|
syn := syntax.POSIX | syntax.ClassNL
|
|
switch c {
|
|
default:
|
|
continue Testing
|
|
case 'E':
|
|
// extended regexp (what we support)
|
|
case 'L':
|
|
// literal
|
|
pattern = QuoteMeta(pattern)
|
|
}
|
|
|
|
for _, c := range flag {
|
|
switch c {
|
|
case 'i':
|
|
syn |= syntax.FoldCase
|
|
}
|
|
}
|
|
|
|
re, err := compile(pattern, syn, true)
|
|
if err != nil {
|
|
if shouldCompile {
|
|
t.Errorf("%s:%d: %#q did not compile", file, lineno, pattern)
|
|
}
|
|
continue Testing
|
|
}
|
|
if !shouldCompile {
|
|
t.Errorf("%s:%d: %#q should not compile", file, lineno, pattern)
|
|
continue Testing
|
|
}
|
|
match := re.MatchString(text)
|
|
if match != shouldMatch {
|
|
t.Errorf("%s:%d: %#q.Match(%#q) = %v, want %v", file, lineno, pattern, text, match, shouldMatch)
|
|
continue Testing
|
|
}
|
|
have := re.FindStringSubmatchIndex(text)
|
|
if (len(have) > 0) != match {
|
|
t.Errorf("%s:%d: %#q.Match(%#q) = %v, but %#q.FindSubmatchIndex(%#q) = %v", file, lineno, pattern, text, match, pattern, text, have)
|
|
continue Testing
|
|
}
|
|
if len(have) > len(pos) {
|
|
have = have[:len(pos)]
|
|
}
|
|
if !same(have, pos) {
|
|
t.Errorf("%s:%d: %#q.FindSubmatchIndex(%#q) = %v, want %v", file, lineno, pattern, text, have, pos)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func parseFowlerResult(s string) (ok, compiled, matched bool, pos []int) {
|
|
// Field 4: the test outcome. This is either one of the posix error
|
|
// codes (with REG_ omitted) or the match array, a list of (m,n)
|
|
// entries with m and n being first and last+1 positions in the
|
|
// field 3 string, or NULL if REG_NOSUB is in effect and success
|
|
// is expected. BADPAT is acceptable in place of any regcomp(3)
|
|
// error code. The match[] array is initialized to (-2,-2) before
|
|
// each test. All array elements from 0 to nmatch-1 must be specified
|
|
// in the outcome. Unspecified endpoints (offset -1) are denoted by ?.
|
|
// Unset endpoints (offset -2) are denoted by X. {x}(o:n) denotes a
|
|
// matched (?{...}) expression, where x is the text enclosed by {...},
|
|
// o is the expression ordinal counting from 1, and n is the length of
|
|
// the unmatched portion of the subject string. If x starts with a
|
|
// number then that is the return value of re_execf(), otherwise 0 is
|
|
// returned.
|
|
switch {
|
|
case s == "":
|
|
// Match with no position information.
|
|
ok = true
|
|
compiled = true
|
|
matched = true
|
|
return
|
|
case s == "NOMATCH":
|
|
// Match failure.
|
|
ok = true
|
|
compiled = true
|
|
matched = false
|
|
return
|
|
case 'A' <= s[0] && s[0] <= 'Z':
|
|
// All the other error codes are compile errors.
|
|
ok = true
|
|
compiled = false
|
|
return
|
|
}
|
|
compiled = true
|
|
|
|
var x []int
|
|
for s != "" {
|
|
var end byte = ')'
|
|
if len(x)%2 == 0 {
|
|
if s[0] != '(' {
|
|
ok = false
|
|
return
|
|
}
|
|
s = s[1:]
|
|
end = ','
|
|
}
|
|
i := 0
|
|
for i < len(s) && s[i] != end {
|
|
i++
|
|
}
|
|
if i == 0 || i == len(s) {
|
|
ok = false
|
|
return
|
|
}
|
|
var v = -1
|
|
var err error
|
|
if s[:i] != "?" {
|
|
v, err = strconv.Atoi(s[:i])
|
|
if err != nil {
|
|
ok = false
|
|
return
|
|
}
|
|
}
|
|
x = append(x, v)
|
|
s = s[i+1:]
|
|
}
|
|
if len(x)%2 != 0 {
|
|
ok = false
|
|
return
|
|
}
|
|
ok = true
|
|
matched = true
|
|
pos = x
|
|
return
|
|
}
|
|
|
|
var text []byte
|
|
|
|
func makeText(n int) []byte {
|
|
if len(text) >= n {
|
|
return text[:n]
|
|
}
|
|
text = make([]byte, n)
|
|
x := ^uint32(0)
|
|
for i := range text {
|
|
x += x
|
|
x ^= 1
|
|
if int32(x) < 0 {
|
|
x ^= 0x88888eef
|
|
}
|
|
if x%31 == 0 {
|
|
text[i] = '\n'
|
|
} else {
|
|
text[i] = byte(x%(0x7E+1-0x20) + 0x20)
|
|
}
|
|
}
|
|
return text
|
|
}
|
|
|
|
func benchmark(b *testing.B, re string, n int) {
|
|
r := MustCompile(re)
|
|
t := makeText(n)
|
|
b.ResetTimer()
|
|
b.SetBytes(int64(n))
|
|
for i := 0; i < b.N; i++ {
|
|
if r.Match(t) {
|
|
b.Fatal("match!")
|
|
}
|
|
}
|
|
}
|
|
|
|
const (
|
|
easy0 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ$"
|
|
easy1 = "A[AB]B[BC]C[CD]D[DE]E[EF]F[FG]G[GH]H[HI]I[IJ]J$"
|
|
medium = "[XYZ]ABCDEFGHIJKLMNOPQRSTUVWXYZ$"
|
|
hard = "[ -~]*ABCDEFGHIJKLMNOPQRSTUVWXYZ$"
|
|
parens = "([ -~])*(A)(B)(C)(D)(E)(F)(G)(H)(I)(J)(K)(L)(M)" +
|
|
"(N)(O)(P)(Q)(R)(S)(T)(U)(V)(W)(X)(Y)(Z)$"
|
|
)
|
|
|
|
func BenchmarkMatchEasy0_32(b *testing.B) { benchmark(b, easy0, 32<<0) }
|
|
func BenchmarkMatchEasy0_1K(b *testing.B) { benchmark(b, easy0, 1<<10) }
|
|
func BenchmarkMatchEasy0_32K(b *testing.B) { benchmark(b, easy0, 32<<10) }
|
|
func BenchmarkMatchEasy0_1M(b *testing.B) { benchmark(b, easy0, 1<<20) }
|
|
func BenchmarkMatchEasy0_32M(b *testing.B) { benchmark(b, easy0, 32<<20) }
|
|
func BenchmarkMatchEasy1_32(b *testing.B) { benchmark(b, easy1, 32<<0) }
|
|
func BenchmarkMatchEasy1_1K(b *testing.B) { benchmark(b, easy1, 1<<10) }
|
|
func BenchmarkMatchEasy1_32K(b *testing.B) { benchmark(b, easy1, 32<<10) }
|
|
func BenchmarkMatchEasy1_1M(b *testing.B) { benchmark(b, easy1, 1<<20) }
|
|
func BenchmarkMatchEasy1_32M(b *testing.B) { benchmark(b, easy1, 32<<20) }
|
|
func BenchmarkMatchMedium_32(b *testing.B) { benchmark(b, medium, 32<<0) }
|
|
func BenchmarkMatchMedium_1K(b *testing.B) { benchmark(b, medium, 1<<10) }
|
|
func BenchmarkMatchMedium_32K(b *testing.B) { benchmark(b, medium, 32<<10) }
|
|
func BenchmarkMatchMedium_1M(b *testing.B) { benchmark(b, medium, 1<<20) }
|
|
func BenchmarkMatchMedium_32M(b *testing.B) { benchmark(b, medium, 32<<20) }
|
|
func BenchmarkMatchHard_32(b *testing.B) { benchmark(b, hard, 32<<0) }
|
|
func BenchmarkMatchHard_1K(b *testing.B) { benchmark(b, hard, 1<<10) }
|
|
func BenchmarkMatchHard_32K(b *testing.B) { benchmark(b, hard, 32<<10) }
|
|
func BenchmarkMatchHard_1M(b *testing.B) { benchmark(b, hard, 1<<20) }
|
|
func BenchmarkMatchHard_32M(b *testing.B) { benchmark(b, hard, 32<<20) }
|
|
|
|
func TestLongest(t *testing.T) {
|
|
re, err := Compile(`a(|b)`)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if g, w := re.FindString("ab"), "a"; g != w {
|
|
t.Errorf("first match was %q, want %q", g, w)
|
|
}
|
|
re.Longest()
|
|
if g, w := re.FindString("ab"), "ab"; g != w {
|
|
t.Errorf("longest match was %q, want %q", g, w)
|
|
}
|
|
}
|