syncthing/lib/fnmatch/fnmatch.go

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// Copyright (C) 2014 The Syncthing Authors.
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//
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// 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 (
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NoEscape = (1 << iota)
PathName
CaseFold
)
func Convert(pattern string, flags int) (*regexp.Regexp, error) {
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any := "."
switch runtime.GOOS {
case "windows":
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flags |= NoEscape | CaseFold
pattern = filepath.FromSlash(pattern)
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if flags&PathName != 0 {
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any = "[^\\\\]"
}
case "darwin":
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flags |= CaseFold
fallthrough
default:
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if flags&PathName != 0 {
any = "[^/]"
}
}
// Support case insensitive ignores. We do the loop because we may in some
// circumstances end up with multiple insensitivity prefixes
// ("(?i)(?i)foo"), which should be accepted.
for ignore := strings.TrimPrefix(pattern, "(?i)"); ignore != pattern; ignore = strings.TrimPrefix(pattern, "(?i)") {
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flags |= CaseFold
pattern = ignore
}
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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{".", "+", "$", "^", "(", ")", "|"} {
pattern = strings.Replace(pattern, char, "\\"+char, -1)
}
pattern = strings.Replace(pattern, "**", "[:doublestar:]", -1)
pattern = strings.Replace(pattern, "*", any+"*", -1)
pattern = strings.Replace(pattern, "[:doublestar:]", ".*", -1)
pattern = strings.Replace(pattern, "?", any, -1)
pattern = strings.Replace(pattern, "[:escapedstar:]", "\\*", -1)
pattern = strings.Replace(pattern, "[:escapedques:]", "\\?", -1)
pattern = strings.Replace(pattern, "[:escapeddot:]", "\\.", -1)
pattern = "^" + pattern + "$"
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if flags&CaseFold != 0 {
pattern = "(?i)" + pattern
}
return regexp.Compile(pattern)
}
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// 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
}