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gitea/vendor/github.com/pingcap/tidb/util/stringutil/string_util.go
Thomas Boerger b6a95a8cb3 Integrate public as bindata optionally (#293)
* Dropped unused codekit config

* Integrated dynamic and static bindata for public

* Ignore public bindata

* Add a general generate make task

* Integrated flexible public assets into web command

* Updated vendoring, added all missiong govendor deps

* Made the linter happy with the bindata and dynamic code

* Moved public bindata definition to modules directory

* Ignoring the new bindata path now

* Updated to the new public modules import path

* Updated public bindata command and drop the new prefix
2016-11-30 00:26:36 +08:00

54 lines
1.7 KiB
Go

// Copyright 2015 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package stringutil
import (
"bytes"
"strings"
)
// See: https://dev.mysql.com/doc/refman/5.7/en/string-literals.html#character-escape-sequences
const validEscapeChars = `0'"bntrz\\%_`
// RemoveUselessBackslash removes backslashs which could be ignored in the string literal.
// See: https://dev.mysql.com/doc/refman/5.7/en/string-literals.html
// " Each of these sequences begins with a backslash (“\”), known as the escape character.
// MySQL recognizes the escape sequences shown in Table 9.1, “Special Character Escape Sequences”.
// For all other escape sequences, backslash is ignored. That is, the escaped character is
// interpreted as if it was not escaped. For example, “\x” is just “x”. These sequences are case sensitive.
// For example, “\b” is interpreted as a backspace, but “\B” is interpreted as “B”."
func RemoveUselessBackslash(s string) string {
var (
buf bytes.Buffer
i = 0
)
for i < len(s)-1 {
if s[i] != '\\' {
buf.WriteByte(s[i])
i++
continue
}
next := s[i+1]
if strings.IndexByte(validEscapeChars, next) != -1 {
buf.WriteByte(s[i])
}
buf.WriteByte(next)
i += 2
}
if i == len(s)-1 {
buf.WriteByte(s[i])
}
return buf.String()
}