github.com/dolthub/dolt/go@v0.40.5-0.20240520175717-68db7794bea6/libraries/doltcore/sqle/wildcard.go (about)

     1  // Copyright 2023 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 sqle
    16  
    17  import (
    18  	"regexp"
    19  	"strings"
    20  )
    21  
    22  // matchWildcardPattern returns true if |s| fully matches |pattern|. |pattern| may contain '*' wildcards
    23  // which matchWildcardPattern 0 or more characters.
    24  func matchWildcardPattern(pattern string, s string) bool {
    25  	result, _ := regexp.MatchString(wildcardToRegexp(pattern), s)
    26  	return result
    27  }
    28  
    29  // containsWildcards return true if the string |s| contains any '*' wildcard characters.
    30  func containsWildcards(s string) bool {
    31  	return strings.Contains(s, "*")
    32  }
    33  
    34  // wildcardToRegexp converts a wildcard pattern to a regular expression pattern.
    35  func wildcardToRegexp(pattern string) string {
    36  	components := strings.Split(pattern, "*")
    37  	if len(components) == 1 {
    38  		// if len is 1, there are no *'s, return exact match pattern
    39  		return "^" + pattern + "$"
    40  	}
    41  	var result strings.Builder
    42  	for i, literal := range components {
    43  		// Replace * with .*
    44  		if i > 0 {
    45  			result.WriteString(".*")
    46  		}
    47  
    48  		// Quote regex meta characters in the literal text.
    49  		result.WriteString(regexp.QuoteMeta(literal))
    50  	}
    51  	return "^" + result.String() + "$"
    52  }