UNPKG

2.64 kBJavaScriptView Raw
1
2!function(exports) {
3 "use strict";
4 var sep = exports.sep = "/"
5 exports.dirname = dirname
6 exports.normalize = normalize
7 exports.relative = relative
8 exports.resolve = resolve
9
10 function dirname(path) {
11 for (var skip = 0, i = path.length; i > 0; ) {
12 if (path.charCodeAt(--i) !== 47) {
13 if (skip === 0) skip = i
14 } else if (skip > 0) break
15 }
16 return i > 0 ? path.slice(0, i) : path.charCodeAt(0) === 47 ? "/" : "."
17 }
18
19 function normalize(path) {
20 var c
21 , SLASH = 47
22 , DOT = 46
23 , res = path
24 , abs = res.charCodeAt(0) == SLASH
25 , len = res.length
26 , i = len
27 , cut = len
28 , up = 0
29 , last = SLASH
30
31 for (; i > 0; ) {
32 c = res.charCodeAt(--i)
33 if (c === SLASH) {
34 if (cut === 0) {
35 cut = i
36 } else if (last !== SLASH && up > 0) {
37 up--
38 }
39 } else if (last === SLASH) {
40 if (c === DOT) {
41 if (i > 0) {
42 c = res.charCodeAt(--i)
43 if (c === DOT && (i === 0 || res.charCodeAt(i - 1) === SLASH)) {
44 last = SLASH
45 i--
46 up++
47 } else if (c !== SLASH) {
48 cut = 0
49 }
50 continue
51 } else {
52 break
53 }
54 }
55 if (up === 0 && cut > 0) {
56 if (len === cut) {
57 if (cut > i + 2) {
58 res = res.slice(0, res.charCodeAt(len - 1) === SLASH ? i + 2 : i + 1)
59 }
60 } else if (cut > i + 1) {
61 res = res.slice(0, i + 1) + res.slice(cut)
62 }
63 cut = 0
64 }
65 }
66 last = c
67 }
68 if (cut > 0 && i === 0) {
69 res = res.slice(abs ? cut : cut + 1)
70 }
71 return res
72 }
73
74 function relative(_from, _to) {
75 if (_from === _to) return ""
76
77 var last, code1, code2
78 , from = normalize(clear(_from))
79 , to = normalize(clear(_to))
80 , i = 0
81 , arr = []
82
83 if (from === to) return ""
84
85 for (; code1 === code2; ) {
86 code1 = from.charCodeAt(i)
87 if (code1 === 47) last = i
88 code2 = to.charCodeAt(i++)
89 }
90 if (code1 === code1) {
91 code1 = from.length
92 for (i = last++; i < code1; ) {
93 if (from.charCodeAt(i++) === 47) arr.push("..")
94 }
95 } else {
96 last = i
97 }
98 if (code2 === code2) {
99 arr.push(to.slice(last))
100 }
101
102 return arr.join(sep)
103 }
104
105 function resolve() {
106 var args = arguments
107 , i = args.length
108 , out = []
109
110 for (; i; ) {
111 if ((out[i--] = clear(args[i])).charCodeAt(0) === 47) {
112 out.splice(0, i + 1)
113 i = 0
114 }
115 }
116 if (!out[0]) out[0] = process.cwd()
117
118 return normalize(out.join(sep))
119 }
120
121 function clear(path) {
122 if (typeof path !== "string") {
123 throw new TypeError("Path must be a string. Got " + typeof path)
124 }
125 for (var len = path.length - 1, i = len; path.charCodeAt(i) === 47; i--);
126 return i !== len ? path.slice(0, i < 0 ? 1 : i + 1) : path
127 }
128}(this)
129
130
131