tidb bin 源码
tidb bin 代码
文件路径：/util/collate/bin.go
// Copyright 2020 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package collate
import (
"strings"
"github.com/pingcap/tidb/util/stringutil"
)
type binCollator struct {
}
// Compare implement Collator interface.
func (*binCollator) Compare(a, b string) int {
return strings.Compare(a, b)
}
// Key implement Collator interface.
func (*binCollator) Key(str string) []byte {
return []byte(str)
}
// KeyWithoutTrimRightSpace implement Collator interface.
func (*binCollator) KeyWithoutTrimRightSpace(str string) []byte {
return []byte(str)
}
// Pattern implements Collator interface.
func (*binCollator) Pattern() WildcardPattern {
return &binPattern{}
}
type binPaddingCollator struct {
}
func (*binPaddingCollator) Compare(a, b string) int {
return strings.Compare(truncateTailingSpace(a), truncateTailingSpace(b))
}
func (*binPaddingCollator) Key(str string) []byte {
return []byte(truncateTailingSpace(str))
}
// KeyWithoutTrimRightSpace implement Collator interface.
func (*binPaddingCollator) KeyWithoutTrimRightSpace(str string) []byte {
return []byte(str)
}
// Pattern implements Collator interface.
// Notice that trailing spaces are significant.
func (*binPaddingCollator) Pattern() WildcardPattern {
return &binPattern{}
}
type binPattern struct {
patChars []rune
patTypes []byte
}
// Compile implements WildcardPattern interface.
func (p *binPattern) Compile(patternStr string, escape byte) {
p.patChars, p.patTypes = stringutil.CompilePattern(patternStr, escape)
}
// DoMatch implements WildcardPattern interface.
func (p *binPattern) DoMatch(str string) bool {
return stringutil.DoMatch(str, p.patChars, p.patTypes)
}
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