github.com/joomcode/cue@v0.4.4-0.20221111115225-539fe3512047/internal/str/path.go (about)

     1  // Copyright 2018 The CUE Authors
     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 str
    16  
    17  import (
    18  	"path/filepath"
    19  	"strings"
    20  )
    21  
    22  // HasPath reports whether the slash-separated path s
    23  // begins with the elements in prefix.
    24  func HasPathPrefix(s, prefix string) bool {
    25  	if len(s) == len(prefix) {
    26  		return s == prefix
    27  	}
    28  	if prefix == "" {
    29  		return true
    30  	}
    31  	if len(s) > len(prefix) {
    32  		if prefix[len(prefix)-1] == '/' || s[len(prefix)] == '/' {
    33  			return s[:len(prefix)] == prefix
    34  		}
    35  	}
    36  	return false
    37  }
    38  
    39  // HasFilePathPrefix reports whether the filesystem path s
    40  // begins with the elements in prefix.
    41  func HasFilePathPrefix(s, prefix string) bool {
    42  	sv := strings.ToUpper(filepath.VolumeName(s))
    43  	pv := strings.ToUpper(filepath.VolumeName(prefix))
    44  	s = s[len(sv):]
    45  	prefix = prefix[len(pv):]
    46  	switch {
    47  	default:
    48  		return false
    49  	case sv != pv:
    50  		return false
    51  	case len(s) == len(prefix):
    52  		return s == prefix
    53  	case prefix == "":
    54  		return true
    55  	case len(s) > len(prefix):
    56  		if prefix[len(prefix)-1] == filepath.Separator {
    57  			return strings.HasPrefix(s, prefix)
    58  		}
    59  		return s[len(prefix)] == filepath.Separator && s[:len(prefix)] == prefix
    60  	}
    61  }