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marked.js
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marked.js
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const Lexer = require('./Lexer.js');
const Parser = require('./Parser.js');
const Tokenizer = require('./Tokenizer.js');
const Renderer = require('./Renderer.js');
const TextRenderer = require('./TextRenderer.js');
const Slugger = require('./Slugger.js');
const {
merge,
checkSanitizeDeprecation,
escape
} = require('./helpers.js');
const {
getDefaults,
changeDefaults,
defaults
} = require('./defaults.js');
/**
* Marked
*/
function marked(src, opt, callback) {
// throw error in case of non string input
if (typeof src === 'undefined' || src === null) {
throw new Error('marked(): input parameter is undefined or null');
}
if (typeof src !== 'string') {
throw new Error('marked(): input parameter is of type '
+ Object.prototype.toString.call(src) + ', string expected');
}
if (typeof opt === 'function') {
callback = opt;
opt = null;
}
opt = merge({}, marked.defaults, opt || {});
checkSanitizeDeprecation(opt);
if (callback) {
const highlight = opt.highlight;
let tokens;
try {
tokens = Lexer.lex(src, opt);
} catch (e) {
return callback(e);
}
const done = function(err) {
let out;
if (!err) {
try {
if (opt.walkTokens) {
marked.walkTokens(tokens, opt.walkTokens);
}
out = Parser.parse(tokens, opt);
} catch (e) {
err = e;
}
}
opt.highlight = highlight;
return err
? callback(err)
: callback(null, out);
};
if (!highlight || highlight.length < 3) {
return done();
}
delete opt.highlight;
if (!tokens.length) return done();
let pending = 0;
marked.walkTokens(tokens, function(token) {
if (token.type === 'code') {
pending++;
setTimeout(() => {
highlight(token.text, token.lang, function(err, code) {
if (err) {
return done(err);
}
if (code != null && code !== token.text) {
token.text = code;
token.escaped = true;
}
pending--;
if (pending === 0) {
done();
}
});
}, 0);
}
});
if (pending === 0) {
done();
}
return;
}
try {
const tokens = Lexer.lex(src, opt);
if (opt.walkTokens) {
marked.walkTokens(tokens, opt.walkTokens);
}
return Parser.parse(tokens, opt);
} catch (e) {
e.message += '\nPlease report this to https://github.com/markedjs/marked.';
if (opt.silent) {
return '<p>An error occurred:</p><pre>'
+ escape(e.message + '', true)
+ '</pre>';
}
throw e;
}
}
/**
* Options
*/
marked.options =
marked.setOptions = function(opt) {
merge(marked.defaults, opt);
changeDefaults(marked.defaults);
return marked;
};
marked.getDefaults = getDefaults;
marked.defaults = defaults;
/**
* Use Extension
*/
marked.use = function(...args) {
const opts = merge({}, ...args);
const extensions = marked.defaults.extensions || { renderers: {}, childTokens: {} };
let hasExtensions;
args.forEach((pack) => {
// ==-- Parse "addon" extensions --== //
if (pack.extensions) {
hasExtensions = true;
pack.extensions.forEach((ext) => {
if (!ext.name) {
throw new Error('extension name required');
}
if (ext.renderer) { // Renderer extensions
const prevRenderer = extensions.renderers ? extensions.renderers[ext.name] : null;
if (prevRenderer) {
// Replace extension with func to run new extension but fall back if false
extensions.renderers[ext.name] = function(...args) {
let ret = ext.renderer.apply(this, args);
if (ret === false) {
ret = prevRenderer.apply(this, args);
}
return ret;
};
} else {
extensions.renderers[ext.name] = ext.renderer;
}
}
if (ext.tokenizer) { // Tokenizer Extensions
if (!ext.level || (ext.level !== 'block' && ext.level !== 'inline')) {
throw new Error("extension level must be 'block' or 'inline'");
}
if (extensions[ext.level]) {
extensions[ext.level].unshift(ext.tokenizer);
} else {
extensions[ext.level] = [ext.tokenizer];
}
if (ext.start) { // Function to check for start of token
if (ext.level === 'block') {
if (extensions.startBlock) {
extensions.startBlock.push(ext.start);
} else {
extensions.startBlock = [ext.start];
}
} else if (ext.level === 'inline') {
if (extensions.startInline) {
extensions.startInline.push(ext.start);
} else {
extensions.startInline = [ext.start];
}
}
}
}
if (ext.childTokens) { // Child tokens to be visited by walkTokens
extensions.childTokens[ext.name] = ext.childTokens;
}
});
}
// ==-- Parse "overwrite" extensions --== //
if (pack.renderer) {
const renderer = marked.defaults.renderer || new Renderer();
for (const prop in pack.renderer) {
const prevRenderer = renderer[prop];
// Replace renderer with func to run extension, but fall back if false
renderer[prop] = (...args) => {
let ret = pack.renderer[prop].apply(renderer, args);
if (ret === false) {
ret = prevRenderer.apply(renderer, args);
}
return ret;
};
}
opts.renderer = renderer;
}
if (pack.tokenizer) {
const tokenizer = marked.defaults.tokenizer || new Tokenizer();
for (const prop in pack.tokenizer) {
const prevTokenizer = tokenizer[prop];
// Replace tokenizer with func to run extension, but fall back if false
tokenizer[prop] = (...args) => {
let ret = pack.tokenizer[prop].apply(tokenizer, args);
if (ret === false) {
ret = prevTokenizer.apply(tokenizer, args);
}
return ret;
};
}
opts.tokenizer = tokenizer;
}
// ==-- Parse WalkTokens extensions --== //
if (pack.walkTokens) {
const walkTokens = marked.defaults.walkTokens;
opts.walkTokens = (token) => {
pack.walkTokens.call(this, token);
if (walkTokens) {
walkTokens(token);
}
};
}
if (hasExtensions) {
opts.extensions = extensions;
}
marked.setOptions(opts);
});
};
/**
* Run callback for every token
*/
marked.walkTokens = function(tokens, callback) {
for (const token of tokens) {
callback(token);
switch (token.type) {
case 'table': {
for (const cell of token.tokens.header) {
marked.walkTokens(cell, callback);
}
for (const row of token.tokens.cells) {
for (const cell of row) {
marked.walkTokens(cell, callback);
}
}
break;
}
case 'list': {
marked.walkTokens(token.items, callback);
break;
}
default: {
if (marked.defaults.extensions && marked.defaults.extensions.childTokens && marked.defaults.extensions.childTokens[token.type]) { // Walk any extensions
marked.defaults.extensions.childTokens[token.type].forEach(function(childTokens) {
marked.walkTokens(token[childTokens], callback);
});
} else if (token.tokens) {
marked.walkTokens(token.tokens, callback);
}
}
}
}
};
/**
* Parse Inline
*/
marked.parseInline = function(src, opt) {
// throw error in case of non string input
if (typeof src === 'undefined' || src === null) {
throw new Error('marked.parseInline(): input parameter is undefined or null');
}
if (typeof src !== 'string') {
throw new Error('marked.parseInline(): input parameter is of type '
+ Object.prototype.toString.call(src) + ', string expected');
}
opt = merge({}, marked.defaults, opt || {});
checkSanitizeDeprecation(opt);
try {
const tokens = Lexer.lexInline(src, opt);
if (opt.walkTokens) {
marked.walkTokens(tokens, opt.walkTokens);
}
return Parser.parseInline(tokens, opt);
} catch (e) {
e.message += '\nPlease report this to https://github.com/markedjs/marked.';
if (opt.silent) {
return '<p>An error occurred:</p><pre>'
+ escape(e.message + '', true)
+ '</pre>';
}
throw e;
}
};
/**
* Expose
*/
marked.Parser = Parser;
marked.parser = Parser.parse;
marked.Renderer = Renderer;
marked.TextRenderer = TextRenderer;
marked.Lexer = Lexer;
marked.lexer = Lexer.lex;
marked.Tokenizer = Tokenizer;
marked.Slugger = Slugger;
marked.parse = marked;
module.exports = marked;