github.com/whtcorpsinc/milevadb-prod@v0.0.0-20211104133533-f57f4be3b597/soliton/collate/bin.go (about)

     1  // Copyright 2020 WHTCORPS INC, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package defCauslate
    15  
    16  import (
    17  	"strings"
    18  
    19  	"github.com/whtcorpsinc/milevadb/soliton/stringutil"
    20  )
    21  
    22  type binDefCauslator struct {
    23  }
    24  
    25  // Compare implement DefCauslator interface.
    26  func (bc *binDefCauslator) Compare(a, b string) int {
    27  	return strings.Compare(a, b)
    28  }
    29  
    30  // Key implement DefCauslator interface.
    31  func (bc *binDefCauslator) Key(str string) []byte {
    32  	return []byte(str)
    33  }
    34  
    35  // Pattern implements DefCauslator interface.
    36  func (bc *binDefCauslator) Pattern() WildcardPattern {
    37  	return &binPattern{}
    38  }
    39  
    40  type binPaddingDefCauslator struct {
    41  }
    42  
    43  func (bpc *binPaddingDefCauslator) Compare(a, b string) int {
    44  	return strings.Compare(truncateTailingSpace(a), truncateTailingSpace(b))
    45  }
    46  
    47  func (bpc *binPaddingDefCauslator) Key(str string) []byte {
    48  	return []byte(truncateTailingSpace(str))
    49  }
    50  
    51  // Pattern implements DefCauslator interface.
    52  // Notice that trailing spaces are significant.
    53  func (bpc *binPaddingDefCauslator) Pattern() WildcardPattern {
    54  	return &binPattern{}
    55  }
    56  
    57  type binPattern struct {
    58  	patChars []byte
    59  	patTypes []byte
    60  }
    61  
    62  // Compile implements WildcardPattern interface.
    63  func (p *binPattern) Compile(patternStr string, escape byte) {
    64  	p.patChars, p.patTypes = stringutil.CompilePattern(patternStr, escape)
    65  }
    66  
    67  // Compile implements WildcardPattern interface.
    68  func (p *binPattern) DoMatch(str string) bool {
    69  	return stringutil.DoMatch(str, p.patChars, p.patTypes)
    70  }