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50 lines
972 B
Go
50 lines
972 B
Go
// Copyright 2025 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package zoekt
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import "unicode/utf8"
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// Bitmap used by func special to check whether a character needs to be escaped.
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var specialBytes [16]byte
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// special reports whether byte b needs to be escaped by QuoteMeta.
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func special(b byte) bool {
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return b < utf8.RuneSelf && specialBytes[b%16]&(1<<(b/16)) != 0
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}
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func init() {
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for _, b := range []byte(`-:\.+*?()|[]{}^$`) {
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specialBytes[b%16] |= 1 << (b / 16)
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}
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}
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func QuoteMeta(s string) string {
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// A byte loop is correct because all metacharacters are ASCII.
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var i int
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for i = 0; i < len(s); i++ {
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if special(s[i]) {
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break
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}
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}
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// No meta characters found, so return original string.
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if i >= len(s) {
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return s
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}
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b := make([]byte, 3*len(s)-2*i)
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copy(b, s[:i])
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j := i
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for ; i < len(s); i++ {
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if special(s[i]) {
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b[j] = '\\'
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j++
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b[j] = '\\'
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j++
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}
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b[j] = s[i]
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j++
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}
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return string(b[:j])
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}
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