source: trip-planner-front/node_modules/ret/lib/util.js@ 76712b2

Last change on this file since 76712b2 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 2.6 KB
Line 
1var types = require('./types');
2var sets = require('./sets');
3
4
5// All of these are private and only used by randexp.
6// It's assumed that they will always be called with the correct input.
7
8var CTRL = '@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^ ?';
9var SLSH = { '0': 0, 't': 9, 'n': 10, 'v': 11, 'f': 12, 'r': 13 };
10
11/**
12 * Finds character representations in str and convert all to
13 * their respective characters
14 *
15 * @param {String} str
16 * @return {String}
17 */
18exports.strToChars = function(str) {
19 /* jshint maxlen: false */
20 var chars_regex = /(\[\\b\])|(\\)?\\(?:u([A-F0-9]{4})|x([A-F0-9]{2})|(0?[0-7]{2})|c([@A-Z\[\\\]\^?])|([0tnvfr]))/g;
21 str = str.replace(chars_regex, function(s, b, lbs, a16, b16, c8, dctrl, eslsh) {
22 if (lbs) {
23 return s;
24 }
25
26 var code = b ? 8 :
27 a16 ? parseInt(a16, 16) :
28 b16 ? parseInt(b16, 16) :
29 c8 ? parseInt(c8, 8) :
30 dctrl ? CTRL.indexOf(dctrl) :
31 SLSH[eslsh];
32
33 var c = String.fromCharCode(code);
34
35 // Escape special regex characters.
36 if (/[\[\]{}\^$.|?*+()]/.test(c)) {
37 c = '\\' + c;
38 }
39
40 return c;
41 });
42
43 return str;
44};
45
46
47/**
48 * turns class into tokens
49 * reads str until it encounters a ] not preceeded by a \
50 *
51 * @param {String} str
52 * @param {String} regexpStr
53 * @return {Array.<Array.<Object>, Number>}
54 */
55exports.tokenizeClass = function(str, regexpStr) {
56 /* jshint maxlen: false */
57 var tokens = [];
58 var regexp = /\\(?:(w)|(d)|(s)|(W)|(D)|(S))|((?:(?:\\)(.)|([^\]\\]))-(?:\\)?([^\]]))|(\])|(?:\\)?(.)/g;
59 var rs, c;
60
61
62 while ((rs = regexp.exec(str)) != null) {
63 if (rs[1]) {
64 tokens.push(sets.words());
65
66 } else if (rs[2]) {
67 tokens.push(sets.ints());
68
69 } else if (rs[3]) {
70 tokens.push(sets.whitespace());
71
72 } else if (rs[4]) {
73 tokens.push(sets.notWords());
74
75 } else if (rs[5]) {
76 tokens.push(sets.notInts());
77
78 } else if (rs[6]) {
79 tokens.push(sets.notWhitespace());
80
81 } else if (rs[7]) {
82 tokens.push({
83 type: types.RANGE,
84 from: (rs[8] || rs[9]).charCodeAt(0),
85 to: rs[10].charCodeAt(0),
86 });
87
88 } else if (c = rs[12]) {
89 tokens.push({
90 type: types.CHAR,
91 value: c.charCodeAt(0),
92 });
93
94 } else {
95 return [tokens, regexp.lastIndex];
96 }
97 }
98
99 exports.error(regexpStr, 'Unterminated character class');
100};
101
102
103/**
104 * Shortcut to throw errors.
105 *
106 * @param {String} regexp
107 * @param {String} msg
108 */
109exports.error = function(regexp, msg) {
110 throw new SyntaxError('Invalid regular expression: /' + regexp + '/: ' + msg);
111};
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