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70 lines
1.8 KiB
70 lines
1.8 KiB
// Copyright 2020 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package collate
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import (
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"strings"
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"github.com/pingcap/tidb/util/stringutil"
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)
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type binCollator struct {
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}
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// Compare implement Collator interface.
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func (bc *binCollator) Compare(a, b string) int {
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return strings.Compare(a, b)
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}
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// Key implement Collator interface.
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func (bc *binCollator) Key(str string) []byte {
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return []byte(str)
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}
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// Pattern implements Collator interface.
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func (bc *binCollator) Pattern() WildcardPattern {
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return &binPattern{}
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}
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type binPaddingCollator struct {
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}
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func (bpc *binPaddingCollator) Compare(a, b string) int {
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return strings.Compare(truncateTailingSpace(a), truncateTailingSpace(b))
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}
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func (bpc *binPaddingCollator) Key(str string) []byte {
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return []byte(truncateTailingSpace(str))
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}
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// Pattern implements Collator interface.
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// Notice that trailing spaces are significant.
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func (bpc *binPaddingCollator) Pattern() WildcardPattern {
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return &binPattern{}
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}
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type binPattern struct {
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patChars []byte
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patTypes []byte
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}
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// Compile implements WildcardPattern interface.
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func (p *binPattern) Compile(patternStr string, escape byte) {
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p.patChars, p.patTypes = stringutil.CompilePattern(patternStr, escape)
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}
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// Compile implements WildcardPattern interface.
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func (p *binPattern) DoMatch(str string) bool {
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return stringutil.DoMatch(str, p.patChars, p.patTypes)
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}
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