cuelang.org/go@v0.10.1/pkg/path/os.go (about)

     1  // Copyright 2020 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 path
    16  
    17  // OS must be a valid runtime.GOOS value or "unix".
    18  type OS string
    19  
    20  const (
    21  	Unix    OS = "unix"
    22  	Windows OS = "windows"
    23  	Plan9   OS = "plan9"
    24  )
    25  
    26  // These types have been designed to minimize the diffs with the original Go
    27  // code, thereby minimizing potential toil in keeping them up to date.
    28  
    29  type os struct {
    30  	osInfo
    31  	Separator     byte
    32  	ListSeparator byte
    33  }
    34  
    35  func (o os) isWindows() bool {
    36  	return o.Separator == '\\'
    37  }
    38  
    39  type osInfo interface {
    40  	IsPathSeparator(b byte) bool
    41  	splitList(path string) []string
    42  	volumeNameLen(path string) int
    43  	IsAbs(path string) (b bool)
    44  	HasPrefix(p, prefix string) bool
    45  	join(elem []string) string
    46  	sameWord(a, b string) bool
    47  }
    48  
    49  func getOS(o OS) os {
    50  	switch o {
    51  	case Windows:
    52  		return windows
    53  	case Plan9:
    54  		return plan9
    55  	default:
    56  		return unix
    57  	}
    58  }
    59  
    60  var (
    61  	plan9 = os{
    62  		osInfo:        &plan9Info{},
    63  		Separator:     plan9Separator,
    64  		ListSeparator: plan9ListSeparator,
    65  	}
    66  	unix = os{
    67  		osInfo:        &unixInfo{},
    68  		Separator:     unixSeparator,
    69  		ListSeparator: unixListSeparator,
    70  	}
    71  	windows = os{
    72  		osInfo:        &windowsInfo{},
    73  		Separator:     windowsSeparator,
    74  		ListSeparator: windowsListSeparator,
    75  	}
    76  )