syncthing/internal/fnmatch/fnmatch.go
2015-04-29 10:38:02 +02:00

87 lines
2.2 KiB
Go

// Copyright (C) 2014 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
package fnmatch
import (
"path/filepath"
"regexp"
"runtime"
"strings"
)
const (
NoEscape = (1 << iota)
PathName
CaseFold
)
func Convert(pattern string, flags int) (*regexp.Regexp, error) {
any := "."
switch runtime.GOOS {
case "windows":
flags |= NoEscape | CaseFold
pattern = filepath.FromSlash(pattern)
if flags&PathName != 0 {
any = "[^\\\\]"
}
case "darwin":
flags |= CaseFold
fallthrough
default:
if flags&PathName != 0 {
any = "[^/]"
}
}
// Support case insensitive ignores
ignore := strings.TrimPrefix(pattern, "(?i)")
if ignore != pattern {
flags |= CaseFold
pattern = ignore
}
if flags&NoEscape != 0 {
pattern = strings.Replace(pattern, "\\", "\\\\", -1)
} else {
pattern = strings.Replace(pattern, "\\*", "[:escapedstar:]", -1)
pattern = strings.Replace(pattern, "\\?", "[:escapedques:]", -1)
pattern = strings.Replace(pattern, "\\.", "[:escapeddot:]", -1)
}
// Characters that are special in regexps but not in glob, must be
// escaped.
for _, char := range []string{".", "+", "$", "^", "(", ")", "|"} {
pattern = strings.Replace(pattern, char, "\\"+char, -1)
}
pattern = strings.Replace(pattern, "**", "[:doublestar:]", -1)
pattern = strings.Replace(pattern, "*", any+"*", -1)
pattern = strings.Replace(pattern, "[:doublestar:]", ".*", -1)
pattern = strings.Replace(pattern, "?", any, -1)
pattern = strings.Replace(pattern, "[:escapedstar:]", "\\*", -1)
pattern = strings.Replace(pattern, "[:escapedques:]", "\\?", -1)
pattern = strings.Replace(pattern, "[:escapeddot:]", "\\.", -1)
pattern = "^" + pattern + "$"
if flags&CaseFold != 0 {
pattern = "(?i)" + pattern
}
return regexp.Compile(pattern)
}
// Match matches the pattern against the string, with the given flags, and
// returns true if the match is successful.
func Match(pattern, s string, flags int) (bool, error) {
exp, err := Convert(pattern, flags)
if err != nil {
return false, err
}
return exp.MatchString(s), nil
}