source: imaps-frontend/node_modules/regjsgen/regjsgen.js@ 79a0317

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Last change on this file since 79a0317 was 79a0317, checked in by stefan toskovski <stefantoska84@…>, 3 days ago

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1/*!
2 * regjsgen 0.8.0
3 * Copyright 2014-2023 Benjamin Tan <https://ofcr.se/>
4 * Available under the MIT license <https://github.com/bnjmnt4n/regjsgen/blob/main/LICENSE-MIT.txt>
5 */
6;(function() {
7 'use strict';
8
9 // Used to determine if values are of the language type `Object`.
10 var objectTypes = {
11 'function': true,
12 'object': true
13 };
14
15 // Used as a reference to the global object.
16 var root = (objectTypes[typeof window] && window) || this;
17
18 // Detect free variable `exports`.
19 var freeExports = objectTypes[typeof exports] && exports && !exports.nodeType && exports;
20
21 // Detect free variable `module`.
22 var hasFreeModule = objectTypes[typeof module] && module && !module.nodeType;
23
24 // Detect free variable `global` from Node.js or Browserified code and use it as `root`.
25 var freeGlobal = freeExports && hasFreeModule && typeof global == 'object' && global;
26 if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal || freeGlobal.self === freeGlobal)) {
27 root = freeGlobal;
28 }
29
30 // Used to check objects for own properties.
31 var hasOwnProperty = Object.prototype.hasOwnProperty;
32
33 /*--------------------------------------------------------------------------*/
34
35 // Generates a string based on the given code point.
36 // Based on https://mths.be/fromcodepoint by @mathias.
37 function fromCodePoint() {
38 var codePoint = Number(arguments[0]);
39
40 if (
41 !isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity`
42 codePoint < 0 || // not a valid Unicode code point
43 codePoint > 0x10FFFF || // not a valid Unicode code point
44 Math.floor(codePoint) != codePoint // not an integer
45 ) {
46 throw RangeError('Invalid code point: ' + codePoint);
47 }
48
49 if (codePoint <= 0xFFFF) {
50 // BMP code point
51 return String.fromCharCode(codePoint);
52 } else {
53 // Astral code point; split in surrogate halves
54 // http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
55 codePoint -= 0x10000;
56 var highSurrogate = (codePoint >> 10) + 0xD800;
57 var lowSurrogate = (codePoint % 0x400) + 0xDC00;
58 return String.fromCharCode(highSurrogate, lowSurrogate);
59 }
60 }
61
62 /*--------------------------------------------------------------------------*/
63
64 // Ensures that nodes have the correct types.
65 var assertTypeRegexMap = {};
66 function assertType(type, expected) {
67 if (expected.indexOf('|') == -1) {
68 if (type == expected) {
69 return;
70 }
71
72 throw Error('Invalid node type: ' + type + '; expected type: ' + expected);
73 }
74
75 expected = hasOwnProperty.call(assertTypeRegexMap, expected)
76 ? assertTypeRegexMap[expected]
77 : (assertTypeRegexMap[expected] = RegExp('^(?:' + expected + ')$'));
78
79 if (expected.test(type)) {
80 return;
81 }
82
83 throw Error('Invalid node type: ' + type + '; expected types: ' + expected);
84 }
85
86 /*--------------------------------------------------------------------------*/
87
88 // Generates a regular expression string based on an AST.
89 function generate(node) {
90 var type = node.type;
91
92 if (hasOwnProperty.call(generators, type)) {
93 return generators[type](node);
94 }
95
96 throw Error('Invalid node type: ' + type);
97 }
98
99 // Constructs a string by concatentating the output of each term.
100 function generateSequence(generator, terms, /* optional */ separator) {
101 var i = -1,
102 length = terms.length,
103 result = '',
104 term;
105
106 while (++i < length) {
107 term = terms[i];
108
109 if (separator && i > 0) result += separator;
110
111 // Ensure that `\0` null escapes followed by number symbols are not
112 // treated as backreferences.
113 if (
114 i + 1 < length &&
115 terms[i].type == 'value' &&
116 terms[i].kind == 'null' &&
117 terms[i + 1].type == 'value' &&
118 terms[i + 1].kind == 'symbol' &&
119 terms[i + 1].codePoint >= 48 &&
120 terms[i + 1].codePoint <= 57
121 ) {
122 result += '\\000';
123 continue;
124 }
125
126 result += generator(term);
127 }
128
129 return result;
130 }
131
132 /*--------------------------------------------------------------------------*/
133
134 function generateAlternative(node) {
135 assertType(node.type, 'alternative');
136
137 return generateSequence(generateTerm, node.body);
138 }
139
140 function generateAnchor(node) {
141 assertType(node.type, 'anchor');
142
143 switch (node.kind) {
144 case 'start':
145 return '^';
146 case 'end':
147 return '$';
148 case 'boundary':
149 return '\\b';
150 case 'not-boundary':
151 return '\\B';
152 default:
153 throw Error('Invalid assertion');
154 }
155 }
156
157 var atomType = 'anchor|characterClass|characterClassEscape|dot|group|reference|unicodePropertyEscape|value';
158
159 function generateAtom(node) {
160 assertType(node.type, atomType);
161
162 return generate(node);
163 }
164
165 function generateCharacterClass(node) {
166 assertType(node.type, 'characterClass');
167
168 var kind = node.kind;
169 var separator = kind === 'intersection' ? '&&' : kind === 'subtraction' ? '--' : '';
170
171 return '[' +
172 (node.negative ? '^' : '') +
173 generateSequence(generateClassAtom, node.body, separator) +
174 ']';
175 }
176
177 function generateCharacterClassEscape(node) {
178 assertType(node.type, 'characterClassEscape');
179
180 return '\\' + node.value;
181 }
182
183 function generateCharacterClassRange(node) {
184 assertType(node.type, 'characterClassRange');
185
186 var min = node.min,
187 max = node.max;
188
189 if (min.type == 'characterClassRange' || max.type == 'characterClassRange') {
190 throw Error('Invalid character class range');
191 }
192
193 return generateClassAtom(min) + '-' + generateClassAtom(max);
194 }
195
196 function generateClassAtom(node) {
197 assertType(node.type, 'anchor|characterClass|characterClassEscape|characterClassRange|dot|value|unicodePropertyEscape|classStrings');
198
199 return generate(node);
200 }
201
202 function generateClassStrings(node) {
203 assertType(node.type, 'classStrings');
204
205 return '\\q{' + generateSequence(generateClassString, node.strings, '|') + '}';
206 }
207
208 function generateClassString(node) {
209 assertType(node.type, 'classString');
210
211 return generateSequence(generate, node.characters);
212 }
213
214 function generateDisjunction(node) {
215 assertType(node.type, 'disjunction');
216
217 return generateSequence(generate, node.body, '|');
218 }
219
220
221 function generateDot(node) {
222 assertType(node.type, 'dot');
223
224 return '.';
225 }
226
227 function generateGroup(node) {
228 assertType(node.type, 'group');
229
230 var result = '';
231
232 switch (node.behavior) {
233 case 'normal':
234 if (node.name) {
235 result += '?<' + generateIdentifier(node.name) + '>';
236 }
237 break;
238 case 'ignore':
239 if (node.modifierFlags) {
240 result += '?';
241 if (node.modifierFlags.enabling) result += node.modifierFlags.enabling;
242 if (node.modifierFlags.disabling) result += "-" + node.modifierFlags.disabling;
243 result += ':';
244 } else {
245 result += '?:';
246 }
247 break;
248 case 'lookahead':
249 result += '?=';
250 break;
251 case 'negativeLookahead':
252 result += '?!';
253 break;
254 case 'lookbehind':
255 result += '?<=';
256 break;
257 case 'negativeLookbehind':
258 result += '?<!';
259 break;
260 default:
261 throw Error('Invalid behaviour: ' + node.behaviour);
262 }
263
264 result += generateSequence(generate, node.body);
265
266 return '(' + result + ')';
267 }
268
269 function generateIdentifier(node) {
270 assertType(node.type, 'identifier');
271
272 return node.value;
273 }
274
275 function generateQuantifier(node) {
276 assertType(node.type, 'quantifier');
277
278 var quantifier = '',
279 min = node.min,
280 max = node.max;
281
282 if (max == null) {
283 if (min == 0) {
284 quantifier = '*';
285 } else if (min == 1) {
286 quantifier = '+';
287 } else {
288 quantifier = '{' + min + ',}';
289 }
290 } else if (min == max) {
291 quantifier = '{' + min + '}';
292 } else if (min == 0 && max == 1) {
293 quantifier = '?';
294 } else {
295 quantifier = '{' + min + ',' + max + '}';
296 }
297
298 if (!node.greedy) {
299 quantifier += '?';
300 }
301
302 return generateAtom(node.body[0]) + quantifier;
303 }
304
305 function generateReference(node) {
306 assertType(node.type, 'reference');
307
308 if (node.matchIndex) {
309 return '\\' + node.matchIndex;
310 }
311 if (node.name) {
312 return '\\k<' + generateIdentifier(node.name) + '>';
313 }
314
315 throw new Error('Unknown reference type');
316 }
317
318 function generateTerm(node) {
319 assertType(node.type, atomType + '|empty|quantifier');
320
321 return generate(node);
322 }
323
324 function generateUnicodePropertyEscape(node) {
325 assertType(node.type, 'unicodePropertyEscape');
326
327 return '\\' + (node.negative ? 'P' : 'p') + '{' + node.value + '}';
328 }
329
330 function generateValue(node) {
331 assertType(node.type, 'value');
332
333 var kind = node.kind,
334 codePoint = node.codePoint;
335
336 if (typeof codePoint != 'number') {
337 throw new Error('Invalid code point: ' + codePoint);
338 }
339
340 switch (kind) {
341 case 'controlLetter':
342 return '\\c' + fromCodePoint(codePoint + 64);
343 case 'hexadecimalEscape':
344 return '\\x' + ('00' + codePoint.toString(16).toUpperCase()).slice(-2);
345 case 'identifier':
346 return '\\' + fromCodePoint(codePoint);
347 case 'null':
348 return '\\' + codePoint;
349 case 'octal':
350 return '\\' + ('000' + codePoint.toString(8)).slice(-3);
351 case 'singleEscape':
352 switch (codePoint) {
353 case 0x0008:
354 return '\\b';
355 case 0x0009:
356 return '\\t';
357 case 0x000A:
358 return '\\n';
359 case 0x000B:
360 return '\\v';
361 case 0x000C:
362 return '\\f';
363 case 0x000D:
364 return '\\r';
365 case 0x002D:
366 return '\\-';
367 default:
368 throw Error('Invalid code point: ' + codePoint);
369 }
370 case 'symbol':
371 return fromCodePoint(codePoint);
372 case 'unicodeEscape':
373 return '\\u' + ('0000' + codePoint.toString(16).toUpperCase()).slice(-4);
374 case 'unicodeCodePointEscape':
375 return '\\u{' + codePoint.toString(16).toUpperCase() + '}';
376 default:
377 throw Error('Unsupported node kind: ' + kind);
378 }
379 }
380
381 /*--------------------------------------------------------------------------*/
382
383 // Used to generate strings for each node type.
384 var generators = {
385 'alternative': generateAlternative,
386 'anchor': generateAnchor,
387 'characterClass': generateCharacterClass,
388 'characterClassEscape': generateCharacterClassEscape,
389 'characterClassRange': generateCharacterClassRange,
390 'classStrings': generateClassStrings,
391 'disjunction': generateDisjunction,
392 'dot': generateDot,
393 'group': generateGroup,
394 'quantifier': generateQuantifier,
395 'reference': generateReference,
396 'unicodePropertyEscape': generateUnicodePropertyEscape,
397 'value': generateValue
398 };
399
400 /*--------------------------------------------------------------------------*/
401
402 // Export regjsgen.
403 var regjsgen = {
404 'generate': generate
405 };
406
407 // Some AMD build optimizers, like r.js, check for condition patterns like the following:
408 if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
409 // Define as an anonymous module so it can be aliased through path mapping.
410 define(function() {
411 return regjsgen;
412 });
413
414 root.regjsgen = regjsgen;
415 }
416 // Check for `exports` after `define` in case a build optimizer adds an `exports` object.
417 else if (freeExports && hasFreeModule) {
418 // Export for CommonJS support.
419 freeExports.generate = generate;
420 }
421 else {
422 // Export to the global object.
423 root.regjsgen = regjsgen;
424 }
425}.call(this));
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