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 }