github.com/hasnat/dolt/go@v0.0.0-20210628190320-9eb5d843fbb7/libraries/doltcore/ref/ref_spec_pattern.go (about)

     1  // Copyright 2019 Dolthub, 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  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package ref
    16  
    17  import "strings"
    18  
    19  type pattern interface {
    20  	matches(string) (string, bool)
    21  }
    22  
    23  type strPattern string
    24  
    25  func (sp strPattern) matches(s string) (string, bool) {
    26  	return "", s == string(sp)
    27  }
    28  
    29  type wcPattern struct {
    30  	prefixStr string
    31  	suffixStr string
    32  }
    33  
    34  func newWildcardPattern(s string) wcPattern {
    35  	tokens := strings.Split(s, "*")
    36  
    37  	if len(tokens) != 2 {
    38  		panic("invalid localPattern")
    39  	}
    40  
    41  	return wcPattern{tokens[0], tokens[1]}
    42  }
    43  
    44  func (wp wcPattern) matches(s string) (string, bool) {
    45  	if strings.HasPrefix(s, wp.prefixStr) {
    46  		s = s[len(wp.prefixStr):]
    47  		if strings.HasSuffix(s, wp.suffixStr) {
    48  			return s[:len(s)-len(wp.suffixStr)], true
    49  		}
    50  	}
    51  
    52  	return "", false
    53  }