83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
// 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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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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"github.com/pingcap/tidb/pkg/util/collate/ucadata"
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"github.com/pingcap/tidb/pkg/util/stringutil"
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)
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const (
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// magic number indicate weight has 2 uint64, should get from `longRuneMap`
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longRune uint64 = 0xFFFD
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)
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//go:generate go run ./ucaimpl/main.go -- unicode_0400_ci_generated.go
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type unicode0400Impl struct {
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}
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func (unicode0400Impl) Clone() unicode0400Impl {
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return unicode0400Impl{}
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}
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func (unicode0400Impl) Preprocess(s string) string {
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return truncateTailingSpace(s)
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}
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func (unicode0400Impl) GetWeight(r rune) (first, second uint64) {
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if r > 0xFFFF {
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return 0xFFFD, 0
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}
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if ucadata.DUCET0400Table.MapTable4[r] == longRune {
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return ucadata.DUCET0400Table.LongRuneMap[r][0], ucadata.DUCET0400Table.LongRuneMap[r][1]
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}
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return ucadata.DUCET0400Table.MapTable4[r], 0
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}
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func (unicode0400Impl) Pattern() WildcardPattern {
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return &unicodePattern{}
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}
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type unicodePattern struct {
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patChars []rune
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patTypes []byte
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}
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// Compile implements WildcardPattern interface.
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func (p *unicodePattern) Compile(patternStr string, escape byte) {
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p.patChars, p.patTypes = stringutil.CompilePatternInner(patternStr, escape)
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}
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// DoMatch implements WildcardPattern interface.
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func (p *unicodePattern) DoMatch(str string) bool {
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return stringutil.DoMatchCustomized(str, p.patChars, p.patTypes, func(a, b rune) bool {
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if a > 0xFFFF || b > 0xFFFF {
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return a == b
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}
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ar, br := ucadata.DUCET0400Table.MapTable4[a], ucadata.DUCET0400Table.MapTable4[b]
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if ar != br {
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return false
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}
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if ar == longRune {
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return a == b
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}
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return true
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})
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}
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