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prism.js
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prism.js
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/* **********************************************
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.
* @param {boolean} [greedy=false] Whether the pattern that created this token is greedy or not. Will be removed soon.
* @class
* @global
* @public
*/
function Token(type, content, alias, matchedStr, greedy) {
/**
* 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;
this.length = (matchedStr || "").length|0;
this.greedy = !!greedy;
}
/**
* 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 {boolean} [oneshot=false]
* @param {string} [target]
* @private
*/
function matchGrammar(text, tokenList, grammar, startNode, startPos, oneshot, target) {
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 (target && target == token + ',' + j) {
return;
}
var pattern = patterns[j],
inside = pattern.inside,
lookbehind = !!pattern.lookbehind,
greedy = !!pattern.greedy,
lookbehindLength = 0,
alias = pattern.alias;
if (greedy && !pattern.pattern.global) {
// Without the global flag, lastIndex won't work
var flags = pattern.pattern.toString().match(/[imsuy]*$/)[0];
pattern.pattern = RegExp(pattern.pattern.source, flags + 'g');
}
pattern = pattern.pattern || pattern;
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
) {
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.prev.value.greedy));
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) {
if (oneshot) {
break;
}
continue;
}
if (lookbehind) {
lookbehindLength = match[1] ? match[1].length : 0;
}
var from = match.index + lookbehindLength,
match = match[0].slice(lookbehindLength),
to = from + match.length,
before = str.slice(0, from),
after = str.slice(to);
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(match, inside) : match, alias, match, greedy);
currentNode = addAfter(tokenList, removeFrom, wrapped);
if (after) {
addAfter(tokenList, currentNode, after);
}
if (removeCount > 1)
matchGrammar(text, tokenList, grammar, currentNode.prev, pos, true, token + ',' + j);
if (oneshot)
break;
}
}
}
}
/**
* @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
*/
function LinkedList() {
/** @type {LinkedListNode<T>} */
var head = { value: null, prev: null, next: null };
/** @type {LinkedListNode<T>} */
var tail = { value: null, prev: head, next: null };
head.next = tail;
/** @type {LinkedListNode<T>} */
this.head = head;
/** @type {LinkedListNode<T>} */
this.tail = tail;