source: trip-planner-front/node_modules/postcss-value-parser/lib/unit.js@ 6a3a178

Last change on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 2.2 KB
Line 
1var minus = "-".charCodeAt(0);
2var plus = "+".charCodeAt(0);
3var dot = ".".charCodeAt(0);
4var exp = "e".charCodeAt(0);
5var EXP = "E".charCodeAt(0);
6
7// Check if three code points would start a number
8// https://www.w3.org/TR/css-syntax-3/#starts-with-a-number
9function likeNumber(value) {
10 var code = value.charCodeAt(0);
11 var nextCode;
12
13 if (code === plus || code === minus) {
14 nextCode = value.charCodeAt(1);
15
16 if (nextCode >= 48 && nextCode <= 57) {
17 return true;
18 }
19
20 var nextNextCode = value.charCodeAt(2);
21
22 if (nextCode === dot && nextNextCode >= 48 && nextNextCode <= 57) {
23 return true;
24 }
25
26 return false;
27 }
28
29 if (code === dot) {
30 nextCode = value.charCodeAt(1);
31
32 if (nextCode >= 48 && nextCode <= 57) {
33 return true;
34 }
35
36 return false;
37 }
38
39 if (code >= 48 && code <= 57) {
40 return true;
41 }
42
43 return false;
44}
45
46// Consume a number
47// https://www.w3.org/TR/css-syntax-3/#consume-number
48module.exports = function(value) {
49 var pos = 0;
50 var length = value.length;
51 var code;
52 var nextCode;
53 var nextNextCode;
54
55 if (length === 0 || !likeNumber(value)) {
56 return false;
57 }
58
59 code = value.charCodeAt(pos);
60
61 if (code === plus || code === minus) {
62 pos++;
63 }
64
65 while (pos < length) {
66 code = value.charCodeAt(pos);
67
68 if (code < 48 || code > 57) {
69 break;
70 }
71
72 pos += 1;
73 }
74
75 code = value.charCodeAt(pos);
76 nextCode = value.charCodeAt(pos + 1);
77
78 if (code === dot && nextCode >= 48 && nextCode <= 57) {
79 pos += 2;
80
81 while (pos < length) {
82 code = value.charCodeAt(pos);
83
84 if (code < 48 || code > 57) {
85 break;
86 }
87
88 pos += 1;
89 }
90 }
91
92 code = value.charCodeAt(pos);
93 nextCode = value.charCodeAt(pos + 1);
94 nextNextCode = value.charCodeAt(pos + 2);
95
96 if (
97 (code === exp || code === EXP) &&
98 ((nextCode >= 48 && nextCode <= 57) ||
99 ((nextCode === plus || nextCode === minus) &&
100 nextNextCode >= 48 &&
101 nextNextCode <= 57))
102 ) {
103 pos += nextCode === plus || nextCode === minus ? 3 : 2;
104
105 while (pos < length) {
106 code = value.charCodeAt(pos);
107
108 if (code < 48 || code > 57) {
109 break;
110 }
111
112 pos += 1;
113 }
114 }
115
116 return {
117 number: value.slice(0, pos),
118 unit: value.slice(pos)
119 };
120};
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