| // Copyright 2018 The CUE Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package str |
| |
| import ( |
| "path/filepath" |
| "strings" |
| ) |
| |
| // HasPath reports whether the slash-separated path s |
| // begins with the elements in prefix. |
| func HasPathPrefix(s, prefix string) bool { |
| if len(s) == len(prefix) { |
| return s == prefix |
| } |
| if prefix == "" { |
| return true |
| } |
| if len(s) > len(prefix) { |
| if prefix[len(prefix)-1] == '/' || s[len(prefix)] == '/' { |
| return s[:len(prefix)] == prefix |
| } |
| } |
| return false |
| } |
| |
| // HasFilePathPrefix reports whether the filesystem path s |
| // begins with the elements in prefix. |
| func HasFilePathPrefix(s, prefix string) bool { |
| sv := strings.ToUpper(filepath.VolumeName(s)) |
| pv := strings.ToUpper(filepath.VolumeName(prefix)) |
| s = s[len(sv):] |
| prefix = prefix[len(pv):] |
| switch { |
| default: |
| return false |
| case sv != pv: |
| return false |
| case len(s) == len(prefix): |
| return s == prefix |
| case prefix == "": |
| return true |
| case len(s) > len(prefix): |
| if prefix[len(prefix)-1] == filepath.Separator { |
| return strings.HasPrefix(s, prefix) |
| } |
| return s[len(prefix)] == filepath.Separator && s[:len(prefix)] == prefix |
| } |
| } |