-
Notifications
You must be signed in to change notification settings - Fork 1.3k
/
prism.js
1680 lines (1479 loc) · 48.3 KB
/
prism.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* **********************************************
Begin prism-core.js
********************************************** */
/// <reference lib="WebWorker"/>
var _self = (typeof window !== 'undefined')
? window // if in browser
: (
(typeof WorkerGlobalScope !== 'undefined' && self instanceof WorkerGlobalScope)
? self // if in worker
: {} // if in node js
);
/**
* Prism: Lightweight, robust, elegant syntax highlighting
*
* @license MIT <https://opensource.org/licenses/MIT>
* @author Lea Verou <https://lea.verou.me>
* @namespace
* @public
*/
var Prism = (function (_self){
// Private helper vars
var lang = /\blang(?:uage)?-([\w-]+)\b/i;
var uniqueId = 0;
var _ = {
/**
* By default, Prism will attempt to highlight all code elements (by calling {@link Prism.highlightAll}) on the
* current page after the page finished loading. This might be a problem if e.g. you wanted to asynchronously load
* additional languages or plugins yourself.
*
* By setting this value to `true`, Prism will not automatically highlight all code elements on the page.
*
* You obviously have to change this value before the automatic highlighting started. To do this, you can add an
* empty Prism object into the global scope before loading the Prism script like this:
*
* ```js
* window.Prism = window.Prism || {};
* Prism.manual = true;
* // add a new <script> to load Prism's script
* ```
*
* @default false
* @type {boolean}
* @memberof Prism
* @public
*/
manual: _self.Prism && _self.Prism.manual,
disableWorkerMessageHandler: _self.Prism && _self.Prism.disableWorkerMessageHandler,
/**
* A namespace for utility methods.
*
* All function in this namespace that are not explicitly marked as _public_ are for __internal use only__ and may
* change or disappear at any time.
*
* @namespace
* @memberof Prism
*/
util: {
encode: function encode(tokens) {
if (tokens instanceof Token) {
return new Token(tokens.type, encode(tokens.content), tokens.alias);
} else if (Array.isArray(tokens)) {
return tokens.map(encode);
} else {
return tokens.replace(/&/g, '&').replace(/</g, '<').replace(/\u00a0/g, ' ');
}
},
/**
* Returns the name of the type of the given value.
*
* @param {any} o
* @returns {string}
* @example
* type(null) === 'Null'
* type(undefined) === 'Undefined'
* type(123) === 'Number'
* type('foo') === 'String'
* type(true) === 'Boolean'
* type([1, 2]) === 'Array'
* type({}) === 'Object'
* type(String) === 'Function'
* type(/abc+/) === 'RegExp'
*/
type: function (o) {
return Object.prototype.toString.call(o).slice(8, -1);
},
/**
* Returns a unique number for the given object. Later calls will still return the same number.
*
* @param {Object} obj
* @returns {number}
*/
objId: function (obj) {
if (!obj['__id']) {
Object.defineProperty(obj, '__id', { value: ++uniqueId });
}
return obj['__id'];
},
/**
* Creates a deep clone of the given object.
*
* The main intended use of this function is to clone language definitions.
*
* @param {T} o
* @param {Record<number, any>} [visited]
* @returns {T}
* @template T
*/
clone: function deepClone(o, visited) {
visited = visited || {};
var clone, id;
switch (_.util.type(o)) {
case 'Object':
id = _.util.objId(o);
if (visited[id]) {
return visited[id];
}
clone = /** @type {Record<string, any>} */ ({});
visited[id] = clone;
for (var key in o) {
if (o.hasOwnProperty(key)) {
clone[key] = deepClone(o[key], visited);
}
}
return /** @type {any} */ (clone);
case 'Array':
id = _.util.objId(o);
if (visited[id]) {
return visited[id];
}
clone = [];
visited[id] = clone;
(/** @type {Array} */(/** @type {any} */(o))).forEach(function (v, i) {
clone[i] = deepClone(v, visited);
});
return /** @type {any} */ (clone);
default:
return o;
}
},
/**
* Returns the Prism language of the given element set by a `language-xxxx` or `lang-xxxx` class.
*
* If no language is set for the element or the element is `null` or `undefined`, `none` will be returned.
*
* @param {Element} element
* @returns {string}
*/
getLanguage: function (element) {
while (element && !lang.test(element.className)) {
element = element.parentElement;
}
if (element) {
return (element.className.match(lang) || [, 'none'])[1].toLowerCase();
}
return 'none';
},
/**
* Returns the script element that is currently executing.
*
* This does __not__ work for line script element.
*
* @returns {HTMLScriptElement | null}
*/
currentScript: function () {
if (typeof document === 'undefined') {
return null;
}
if ('currentScript' in document && 1 < 2 /* hack to trip TS' flow analysis */) {
return /** @type {any} */ (document.currentScript);
}
// IE11 workaround
// we'll get the src of the current script by parsing IE11's error stack trace
// this will not work for inline scripts
try {
throw new Error();
} catch (err) {
// Get file src url from stack. Specifically works with the format of stack traces in IE.
// A stack will look like this:
//
// Error
// at _.util.currentScript (http://localhost/components/prism-core.js:119:5)
// at Global code (http://localhost/components/prism-core.js:606:1)
var src = (/at [^(\r\n]*\((.*):.+:.+\)$/i.exec(err.stack) || [])[1];
if (src) {
var scripts = document.getElementsByTagName('script');
for (var i in scripts) {
if (scripts[i].src == src) {
return scripts[i];
}
}
}
return null;
}
},
/**
* Returns whether a given class is active for `element`.
*
* The class can be activated if `element` or one of its ancestors has the given class and it can be deactivated
* if `element` or one of its ancestors has the negated version of the given class. The _negated version_ of the
* given class is just the given class with a `no-` prefix.
*
* Whether the class is active is determined by the closest ancestor of `element` (where `element` itself is
* closest ancestor) that has the given class or the negated version of it. If neither `element` nor any of its
* ancestors have the given class or the negated version of it, then the default activation will be returned.
*
* In the paradoxical situation where the closest ancestor contains __both__ the given class and the negated
* version of it, the class is considered active.
*
* @param {Element} element
* @param {string} className
* @param {boolean} [defaultActivation=false]
* @returns {boolean}
*/
isActive: function (element, className, defaultActivation) {
var no = 'no-' + className;
while (element) {
var classList = element.classList;
if (classList.contains(className)) {
return true;
}
if (classList.contains(no)) {
return false;
}
element = element.parentElement;
}
return !!defaultActivation;
}
},
/**
* This namespace contains all currently loaded languages and the some helper functions to create and modify languages.
*
* @namespace
* @memberof Prism
* @public
*/
languages: {
/**
* Creates a deep copy of the language with the given id and appends the given tokens.
*
* If a token in `redef` also appears in the copied language, then the existing token in the copied language
* will be overwritten at its original position.
*
* ## Best practices
*
* Since the position of overwriting tokens (token in `redef` that overwrite tokens in the copied language)
* doesn't matter, they can technically be in any order. However, this can be confusing to others that trying to
* understand the language definition because, normally, the order of tokens matters in Prism grammars.
*
* Therefore, it is encouraged to order overwriting tokens according to the positions of the overwritten tokens.
* Furthermore, all non-overwriting tokens should be placed after the overwriting ones.
*
* @param {string} id The id of the language to extend. This has to be a key in `Prism.languages`.
* @param {Grammar} redef The new tokens to append.
* @returns {Grammar} The new language created.
* @public
* @example
* Prism.languages['css-with-colors'] = Prism.languages.extend('css', {
* // Prism.languages.css already has a 'comment' token, so this token will overwrite CSS' 'comment' token
* // at its original position
* 'comment': { ... },
* // CSS doesn't have a 'color' token, so this token will be appended
* 'color': /\b(?:red|green|blue)\b/
* });
*/
extend: function (id, redef) {
var lang = _.util.clone(_.languages[id]);
for (var key in redef) {
lang[key] = redef[key];
}
return lang;
},
/**
* Inserts tokens _before_ another token in a language definition or any other grammar.
*
* ## Usage
*
* This helper method makes it easy to modify existing languages. For example, the CSS language definition
* not only defines CSS highlighting for CSS documents, but also needs to define highlighting for CSS embedded
* in HTML through `<style>` elements. To do this, it needs to modify `Prism.languages.markup` and add the
* appropriate tokens. However, `Prism.languages.markup` is a regular JavaScript object literal, so if you do
* this:
*
* ```js
* Prism.languages.markup.style = {
* // token
* };
* ```
*
* then the `style` token will be added (and processed) at the end. `insertBefore` allows you to insert tokens
* before existing tokens. For the CSS example above, you would use it like this:
*
* ```js
* Prism.languages.insertBefore('markup', 'cdata', {
* 'style': {
* // token
* }
* });
* ```
*
* ## Special cases
*
* If the grammars of `inside` and `insert` have tokens with the same name, the tokens in `inside`'s grammar
* will be ignored.
*
* This behavior can be used to insert tokens after `before`:
*
* ```js
* Prism.languages.insertBefore('markup', 'comment', {
* 'comment': Prism.languages.markup.comment,
* // tokens after 'comment'
* });
* ```
*
* ## Limitations
*
* The main problem `insertBefore` has to solve is iteration order. Since ES2015, the iteration order for object
* properties is guaranteed to be the insertion order (except for integer keys) but some browsers behave
* differently when keys are deleted and re-inserted. So `insertBefore` can't be implemented by temporarily
* deleting properties which is necessary to insert at arbitrary positions.
*
* To solve this problem, `insertBefore` doesn't actually insert the given tokens into the target object.
* Instead, it will create a new object and replace all references to the target object with the new one. This
* can be done without temporarily deleting properties, so the iteration order is well-defined.
*
* However, only references that can be reached from `Prism.languages` or `insert` will be replaced. I.e. if
* you hold the target object in a variable, then the value of the variable will not change.
*
* ```js
* var oldMarkup = Prism.languages.markup;
* var newMarkup = Prism.languages.insertBefore('markup', 'comment', { ... });
*
* assert(oldMarkup !== Prism.languages.markup);
* assert(newMarkup === Prism.languages.markup);
* ```
*
* @param {string} inside The property of `root` (e.g. a language id in `Prism.languages`) that contains the
* object to be modified.
* @param {string} before The key to insert before.
* @param {Grammar} insert An object containing the key-value pairs to be inserted.
* @param {Object<string, any>} [root] The object containing `inside`, i.e. the object that contains the
* object to be modified.
*
* Defaults to `Prism.languages`.
* @returns {Grammar} The new grammar object.
* @public
*/
insertBefore: function (inside, before, insert, root) {
root = root || /** @type {any} */ (_.languages);
var grammar = root[inside];
/** @type {Grammar} */
var ret = {};
for (var token in grammar) {
if (grammar.hasOwnProperty(token)) {
if (token == before) {
for (var newToken in insert) {
if (insert.hasOwnProperty(newToken)) {
ret[newToken] = insert[newToken];
}
}
}
// Do not insert token which also occur in insert. See #1525
if (!insert.hasOwnProperty(token)) {
ret[token] = grammar[token];
}
}
}
var old = root[inside];
root[inside] = ret;
// Update references in other language definitions
_.languages.DFS(_.languages, function(key, value) {
if (value === old && key != inside) {
this[key] = ret;
}
});
return ret;
},
// Traverse a language definition with Depth First Search
DFS: function DFS(o, callback, type, visited) {
visited = visited || {};
var objId = _.util.objId;
for (var i in o) {
if (o.hasOwnProperty(i)) {
callback.call(o, i, o[i], type || i);
var property = o[i],
propertyType = _.util.type(property);
if (propertyType === 'Object' && !visited[objId(property)]) {
visited[objId(property)] = true;
DFS(property, callback, null, visited);
}
else if (propertyType === 'Array' && !visited[objId(property)]) {
visited[objId(property)] = true;
DFS(property, callback, i, visited);
}
}
}
}
},
plugins: {},
/**
* This is the most high-level function in Prism’s API.
* It fetches all the elements that have a `.language-xxxx` class and then calls {@link Prism.highlightElement} on
* each one of them.
*
* This is equivalent to `Prism.highlightAllUnder(document, async, callback)`.
*
* @param {boolean} [async=false] Same as in {@link Prism.highlightAllUnder}.
* @param {HighlightCallback} [callback] Same as in {@link Prism.highlightAllUnder}.
* @memberof Prism
* @public
*/
highlightAll: function(async, callback) {
_.highlightAllUnder(document, async, callback);
},
/**
* Fetches all the descendants of `container` that have a `.language-xxxx` class and then calls
* {@link Prism.highlightElement} on each one of them.
*
* The following hooks will be run:
* 1. `before-highlightall`
* 2. All hooks of {@link Prism.highlightElement} for each element.
*
* @param {ParentNode} container The root element, whose descendants that have a `.language-xxxx` class will be highlighted.
* @param {boolean} [async=false] Whether each element is to be highlighted asynchronously using Web Workers.
* @param {HighlightCallback} [callback] An optional callback to be invoked on each element after its highlighting is done.
* @memberof Prism
* @public
*/
highlightAllUnder: function(container, async, callback) {
var env = {
callback: callback,
container: container,
selector: 'code[class*="language-"], [class*="language-"] code, code[class*="lang-"], [class*="lang-"] code'
};
_.hooks.run('before-highlightall', env);
env.elements = Array.prototype.slice.apply(env.container.querySelectorAll(env.selector));
_.hooks.run('before-all-elements-highlight', env);
for (var i = 0, element; element = env.elements[i++];) {
_.highlightElement(element, async === true, env.callback);
}
},
/**
* Highlights the code inside a single element.
*
* The following hooks will be run:
* 1. `before-sanity-check`
* 2. `before-highlight`
* 3. All hooks of {@link Prism.highlight}. These hooks will only be run by the current worker if `async` is `true`.
* 4. `before-insert`
* 5. `after-highlight`
* 6. `complete`
*
* @param {Element} element The element containing the code.
* It must have a class of `language-xxxx` to be processed, where `xxxx` is a valid language identifier.
* @param {boolean} [async=false] Whether the element is to be highlighted asynchronously using Web Workers
* to improve performance and avoid blocking the UI when highlighting very large chunks of code. This option is
* [disabled by default](https://prismjs.com/faq.html#why-is-asynchronous-highlighting-disabled-by-default).
*
* Note: All language definitions required to highlight the code must be included in the main `prism.js` file for
* asynchronous highlighting to work. You can build your own bundle on the
* [Download page](https://prismjs.com/download.html).
* @param {HighlightCallback} [callback] An optional callback to be invoked after the highlighting is done.
* Mostly useful when `async` is `true`, since in that case, the highlighting is done asynchronously.
* @memberof Prism
* @public
*/
highlightElement: function(element, async, callback) {
// Find language
var language = _.util.getLanguage(element);
var grammar = _.languages[language];
// Set language on the element, if not present
element.className = element.className.replace(lang, '').replace(/\s+/g, ' ') + ' language-' + language;
// Set language on the parent, for styling
var parent = element.parentElement;
if (parent && parent.nodeName.toLowerCase() === 'pre') {
parent.className = parent.className.replace(lang, '').replace(/\s+/g, ' ') + ' language-' + language;
}
var code = element.textContent;
var env = {
element: element,
language: language,
grammar: grammar,
code: code
};
function insertHighlightedCode(highlightedCode) {
env.highlightedCode = highlightedCode;
_.hooks.run('before-insert', env);
env.element.innerHTML = env.highlightedCode;
_.hooks.run('after-highlight', env);
_.hooks.run('complete', env);
callback && callback.call(env.element);
}
_.hooks.run('before-sanity-check', env);
if (!env.code) {
_.hooks.run('complete', env);
callback && callback.call(env.element);
return;
}
_.hooks.run('before-highlight', env);
if (!env.grammar) {
insertHighlightedCode(_.util.encode(env.code));
return;
}
if (async && _self.Worker) {
var worker = new Worker(_.filename);
worker.onmessage = function(evt) {
insertHighlightedCode(evt.data);
};
worker.postMessage(JSON.stringify({
language: env.language,
code: env.code,
immediateClose: true
}));
}
else {
insertHighlightedCode(_.highlight(env.code, env.grammar, env.language));
}
},
/**
* Low-level function, only use if you know what you’re doing. It accepts a string of text as input
* and the language definitions to use, and returns a string with the HTML produced.
*
* The following hooks will be run:
* 1. `before-tokenize`
* 2. `after-tokenize`
* 3. `wrap`: On each {@link Token}.
*
* @param {string} text A string with the code to be highlighted.
* @param {Grammar} grammar An object containing the tokens to use.
*
* Usually a language definition like `Prism.languages.markup`.
* @param {string} language The name of the language definition passed to `grammar`.
* @returns {string} The highlighted HTML.
* @memberof Prism
* @public
* @example
* Prism.highlight('var foo = true;', Prism.languages.javascript, 'javascript');
*/
highlight: function (text, grammar, language) {
var env = {
code: text,
grammar: grammar,
language: language
};
_.hooks.run('before-tokenize', env);
env.tokens = _.tokenize(env.code, env.grammar);
_.hooks.run('after-tokenize', env);
return Token.stringify(_.util.encode(env.tokens), env.language);
},
/**
* This is the heart of Prism, and the most low-level function you can use. It accepts a string of text as input
* and the language definitions to use, and returns an array with the tokenized code.
*
* When the language definition includes nested tokens, the function is called recursively on each of these tokens.
*
* This method could be useful in other contexts as well, as a very crude parser.
*
* @param {string} text A string with the code to be highlighted.
* @param {Grammar} grammar An object containing the tokens to use.
*
* Usually a language definition like `Prism.languages.markup`.
* @returns {TokenStream} An array of strings and tokens, a token stream.
* @memberof Prism
* @public
* @example
* let code = `var foo = 0;`;
* let tokens = Prism.tokenize(code, Prism.languages.javascript);
* tokens.forEach(token => {
* if (token instanceof Prism.Token && token.type === 'number') {
* console.log(`Found numeric literal: ${token.content}`);
* }
* });
*/
tokenize: function(text, grammar) {
var rest = grammar.rest;
if (rest) {
for (var token in rest) {
grammar[token] = rest[token];
}
delete grammar.rest;
}
var tokenList = new LinkedList();
addAfter(tokenList, tokenList.head, text);
matchGrammar(text, tokenList, grammar, tokenList.head, 0);
return toArray(tokenList);
},
/**
* @namespace
* @memberof Prism
* @public
*/
hooks: {
all: {},
/**
* Adds the given callback to the list of callbacks for the given hook.
*
* The callback will be invoked when the hook it is registered for is run.
* Hooks are usually directly run by a highlight function but you can also run hooks yourself.
*
* One callback function can be registered to multiple hooks and the same hook multiple times.
*
* @param {string} name The name of the hook.
* @param {HookCallback} callback The callback function which is given environment variables.
* @public
*/
add: function (name, callback) {
var hooks = _.hooks.all;
hooks[name] = hooks[name] || [];
hooks[name].push(callback);
},
/**
* Runs a hook invoking all registered callbacks with the given environment variables.
*
* Callbacks will be invoked synchronously and in the order in which they were registered.
*
* @param {string} name The name of the hook.
* @param {Object<string, any>} env The environment variables of the hook passed to all callbacks registered.
* @public
*/
run: function (name, env) {
var callbacks = _.hooks.all[name];
if (!callbacks || !callbacks.length) {
return;
}
for (var i=0, callback; callback = callbacks[i++];) {
callback(env);
}
}
},
Token: Token
};
_self.Prism = _;
// Typescript note:
// The following can be used to import the Token type in JSDoc:
//
// @typedef {InstanceType<import("./prism-core")["Token"]>} Token
/**
* Creates a new token.
*
* @param {string} type See {@link Token#type type}
* @param {string | TokenStream} content See {@link Token#content content}
* @param {string|string[]} [alias] The alias(es) of the token.
* @param {string} [matchedStr=""] A copy of the full string this token was created from.
* @class
* @global
* @public
*/
function Token(type, content, alias, matchedStr) {
/**
* The type of the token.
*
* This is usually the key of a pattern in a {@link Grammar}.
*
* @type {string}
* @see GrammarToken
* @public
*/
this.type = type;
/**
* The strings or tokens contained by this token.
*
* This will be a token stream if the pattern matched also defined an `inside` grammar.
*
* @type {string | TokenStream}
* @public
*/
this.content = content;
/**
* The alias(es) of the token.
*
* @type {string|string[]}
* @see GrammarToken
* @public
*/
this.alias = alias;
// Copy of the full string this token was created from
this.length = (matchedStr || '').length | 0;
}
/**
* A token stream is an array of strings and {@link Token Token} objects.
*
* Token streams have to fulfill a few properties that are assumed by most functions (mostly internal ones) that process
* them.
*
* 1. No adjacent strings.
* 2. No empty strings.
*
* The only exception here is the token stream that only contains the empty string and nothing else.
*
* @typedef {Array<string | Token>} TokenStream
* @global
* @public
*/
/**
* Converts the given token or token stream to an HTML representation.
*
* The following hooks will be run:
* 1. `wrap`: On each {@link Token}.
*
* @param {string | Token | TokenStream} o The token or token stream to be converted.
* @param {string} language The name of current language.
* @returns {string} The HTML representation of the token or token stream.
* @memberof Token
* @static
*/
Token.stringify = function stringify(o, language) {
if (typeof o == 'string') {
return o;
}
if (Array.isArray(o)) {
var s = '';
o.forEach(function (e) {
s += stringify(e, language);
});
return s;
}
var env = {
type: o.type,
content: stringify(o.content, language),
tag: 'span',
classes: ['token', o.type],
attributes: {},
language: language
};
var aliases = o.alias;
if (aliases) {
if (Array.isArray(aliases)) {
Array.prototype.push.apply(env.classes, aliases);
} else {
env.classes.push(aliases);
}
}
_.hooks.run('wrap', env);
var attributes = '';
for (var name in env.attributes) {
attributes += ' ' + name + '="' + (env.attributes[name] || '').replace(/"/g, '"') + '"';
}
return '<' + env.tag + ' class="' + env.classes.join(' ') + '"' + attributes + '>' + env.content + '</' + env.tag + '>';
};
/**
* @param {string} text
* @param {LinkedList<string | Token>} tokenList
* @param {any} grammar
* @param {LinkedListNode<string | Token>} startNode
* @param {number} startPos
* @param {RematchOptions} [rematch]
* @returns {void}
* @private
*
* @typedef RematchOptions
* @property {string} cause
* @property {number} reach
*/
function matchGrammar(text, tokenList, grammar, startNode, startPos, rematch) {
for (var token in grammar) {
if (!grammar.hasOwnProperty(token) || !grammar[token]) {
continue;
}
var patterns = grammar[token];
patterns = Array.isArray(patterns) ? patterns : [patterns];
for (var j = 0; j < patterns.length; ++j) {
if (rematch && rematch.cause == token + ',' + j) {
return;
}
var patternObj = patterns[j],
inside = patternObj.inside,
lookbehind = !!patternObj.lookbehind,
greedy = !!patternObj.greedy,
lookbehindLength = 0,
alias = patternObj.alias;
if (greedy && !patternObj.pattern.global) {
// Without the global flag, lastIndex won't work
var flags = patternObj.pattern.toString().match(/[imsuy]*$/)[0];
patternObj.pattern = RegExp(patternObj.pattern.source, flags + 'g');
}
/** @type {RegExp} */
var pattern = patternObj.pattern || patternObj;
for ( // iterate the token list and keep track of the current token/string position
var currentNode = startNode.next, pos = startPos;
currentNode !== tokenList.tail;
pos += currentNode.value.length, currentNode = currentNode.next
) {
if (rematch && pos >= rematch.reach) {
break;
}
var str = currentNode.value;
if (tokenList.length > text.length) {
// Something went terribly wrong, ABORT, ABORT!
return;
}
if (str instanceof Token) {
continue;
}
var removeCount = 1; // this is the to parameter of removeBetween
if (greedy && currentNode != tokenList.tail.prev) {
pattern.lastIndex = pos;
var match = pattern.exec(text);
if (!match) {
break;
}
var from = match.index + (lookbehind && match[1] ? match[1].length : 0);
var to = match.index + match[0].length;
var p = pos;
// find the node that contains the match
p += currentNode.value.length;
while (from >= p) {
currentNode = currentNode.next;
p += currentNode.value.length;
}
// adjust pos (and p)
p -= currentNode.value.length;
pos = p;
// the current node is a Token, then the match starts inside another Token, which is invalid
if (currentNode.value instanceof Token) {
continue;
}
// find the last node which is affected by this match
for (
var k = currentNode;
k !== tokenList.tail && (p < to || typeof k.value === 'string');
k = k.next
) {
removeCount++;
p += k.value.length;
}
removeCount--;
// replace with the new match
str = text.slice(pos, p);
match.index -= pos;
} else {
pattern.lastIndex = 0;
var match = pattern.exec(str);
}
if (!match) {
continue;
}
if (lookbehind) {
lookbehindLength = match[1] ? match[1].length : 0;
}
var from = match.index + lookbehindLength,
matchStr = match[0].slice(lookbehindLength),
to = from + matchStr.length,
before = str.slice(0, from),
after = str.slice(to);
var reach = pos + str.length;
if (rematch && reach > rematch.reach) {
rematch.reach = reach;
}
var removeFrom = currentNode.prev;
if (before) {
removeFrom = addAfter(tokenList, removeFrom, before);
pos += before.length;
}
removeRange(tokenList, removeFrom, removeCount);
var wrapped = new Token(token, inside ? _.tokenize(matchStr, inside) : matchStr, alias, matchStr);
currentNode = addAfter(tokenList, removeFrom, wrapped);
if (after) {
addAfter(tokenList, currentNode, after);
}
if (removeCount > 1) {
// at least one Token object was removed, so we have to do some rematching
// this can only happen if the current pattern is greedy
matchGrammar(text, tokenList, grammar, currentNode.prev, pos, {
cause: token + ',' + j,
reach: reach
});
}
}
}
}
}
/**
* @typedef LinkedListNode
* @property {T} value
* @property {LinkedListNode<T> | null} prev The previous node.
* @property {LinkedListNode<T> | null} next The next node.
* @template T
* @private
*/
/**
* @template T
* @private
*/