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
15package path
16
17// OS must be a valid runtime.GOOS value or "unix".
18type OS string
19
20const (
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
29type os struct {
30	osInfo
31	Separator     byte
32	ListSeparator byte
33}
34
35func (o os) isWindows() bool {
36	return o.Separator == '\\'
37}
38
39type 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
49func 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
60var (
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)
77