mirror of https://github.com/zulip/zulip.git
407 lines
9.5 KiB
Markdown
407 lines
9.5 KiB
Markdown
# marked
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> A full-featured markdown parser and compiler, written in JavaScript. Built
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> for speed.
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[][badge]
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## Install
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``` bash
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npm install marked --save
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```
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## Usage
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Minimal usage:
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```js
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var marked = require('marked');
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console.log(marked('I am using __markdown__.'));
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// Outputs: <p>I am using <strong>markdown</strong>.</p>
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```
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Example setting options with default values:
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```js
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var marked = require('marked');
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marked.setOptions({
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renderer: new marked.Renderer(),
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gfm: true,
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tables: true,
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breaks: false,
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pedantic: false,
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sanitize: true,
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smartLists: true,
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smartypants: false
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});
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console.log(marked('I am using __markdown__.'));
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```
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### Browser
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```html
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<!doctype html>
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<html>
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<head>
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<meta charset="utf-8"/>
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<title>Marked in the browser</title>
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<script src="lib/marked.js"></script>
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</head>
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<body>
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<div id="content"></div>
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<script>
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document.getElementById('content').innerHTML =
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marked('# Marked in browser\n\nRendered by **marked**.');
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</script>
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</body>
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</html>
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```
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## marked(markdownString [,options] [,callback])
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### markdownString
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Type: `string`
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String of markdown source to be compiled.
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### options
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Type: `object`
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Hash of options. Can also be set using the `marked.setOptions` method as seen
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above.
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### callback
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Type: `function`
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Function called when the `markdownString` has been fully parsed when using
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async highlighting. If the `options` argument is omitted, this can be used as
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the second argument.
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## Options
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### highlight
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Type: `function`
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A function to highlight code blocks. The first example below uses async highlighting with
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[node-pygmentize-bundled][pygmentize], and the second is a synchronous example using
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[highlight.js][highlight]:
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```js
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var marked = require('marked');
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var markdownString = '```js\n console.log("hello"); \n```';
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// Async highlighting with pygmentize-bundled
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marked.setOptions({
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highlight: function (code, lang, callback) {
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require('pygmentize-bundled')({ lang: lang, format: 'html' }, code, function (err, result) {
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callback(err, result.toString());
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});
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}
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});
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// Using async version of marked
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marked(markdownString, function (err, content) {
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if (err) throw err;
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console.log(content);
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});
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// Synchronous highlighting with highlight.js
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marked.setOptions({
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highlight: function (code) {
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return require('highlight.js').highlightAuto(code).value;
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}
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});
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console.log(marked(markdownString));
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```
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#### highlight arguments
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`code`
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Type: `string`
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The section of code to pass to the highlighter.
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`lang`
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Type: `string`
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The programming language specified in the code block.
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`callback`
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Type: `function`
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The callback function to call when using an async highlighter.
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### renderer
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Type: `object`
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Default: `new Renderer()`
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An object containing functions to render tokens to HTML.
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#### Overriding renderer methods
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The renderer option allows you to render tokens in a custom manner. Here is an
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example of overriding the default heading token rendering by adding an embedded anchor tag like on GitHub:
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```javascript
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var marked = require('marked');
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var renderer = new marked.Renderer();
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renderer.heading = function (text, level) {
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var escapedText = text.toLowerCase().replace(/[^\w]+/g, '-');
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return '<h' + level + '><a name="' +
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escapedText +
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'" class="anchor" href="#' +
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escapedText +
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'"><span class="header-link"></span></a>' +
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text + '</h' + level + '>';
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},
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console.log(marked('# heading+', { renderer: renderer }));
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```
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This code will output the following HTML:
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```html
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<h1>
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<a name="heading-" class="anchor" href="#heading-">
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<span class="header-link"></span>
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</a>
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heading+
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</h1>
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```
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#### Block level renderer methods
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- code(*string* code, *string* language)
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- blockquote(*string* quote)
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- html(*string* html)
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- heading(*string* text, *number* level)
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- hr()
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- list(*string* body, *boolean* ordered)
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- listitem(*string* text)
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- paragraph(*string* text)
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- table(*string* header, *string* body)
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- tablerow(*string* content)
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- tablecell(*string* content, *object* flags)
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`flags` has the following properties:
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```js
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{
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header: true || false,
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align: 'center' || 'left' || 'right'
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}
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```
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#### Inline level renderer methods
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- strong(*string* text)
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- em(*string* text)
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- codespan(*string* code)
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- br()
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- del(*string* text)
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- link(*string* href, *string* title, *string* text)
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- image(*string* href, *string* title, *string* text)
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### gfm
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Type: `boolean`
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Default: `true`
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Enable [GitHub flavored markdown][gfm].
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### tables
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Type: `boolean`
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Default: `true`
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Enable GFM [tables][tables].
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This option requires the `gfm` option to be true.
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### breaks
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Type: `boolean`
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Default: `false`
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Enable GFM [line breaks][breaks].
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This option requires the `gfm` option to be true.
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### pedantic
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Type: `boolean`
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Default: `false`
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Conform to obscure parts of `markdown.pl` as much as possible. Don't fix any of
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the original markdown bugs or poor behavior.
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### sanitize
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Type: `boolean`
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Default: `false`
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Sanitize the output. Ignore any HTML that has been input.
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### smartLists
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Type: `boolean`
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Default: `true`
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Use smarter list behavior than the original markdown. May eventually be
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default with the old behavior moved into `pedantic`.
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### smartypants
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Type: `boolean`
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Default: `false`
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Use "smart" typograhic punctuation for things like quotes and dashes.
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## Access to lexer and parser
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You also have direct access to the lexer and parser if you so desire.
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``` js
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var tokens = marked.lexer(text, options);
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console.log(marked.parser(tokens));
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```
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``` js
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var lexer = new marked.Lexer(options);
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var tokens = lexer.lex(text);
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console.log(tokens);
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console.log(lexer.rules);
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```
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## CLI
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``` bash
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$ marked -o hello.html
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hello world
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^D
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$ cat hello.html
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<p>hello world</p>
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```
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## Philosophy behind marked
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The point of marked was to create a markdown compiler where it was possible to
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frequently parse huge chunks of markdown without having to worry about
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caching the compiled output somehow...or blocking for an unnecesarily long time.
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marked is very concise and still implements all markdown features. It is also
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now fully compatible with the client-side.
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marked more or less passes the official markdown test suite in its
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entirety. This is important because a surprising number of markdown compilers
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cannot pass more than a few tests. It was very difficult to get marked as
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compliant as it is. It could have cut corners in several areas for the sake
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of performance, but did not in order to be exactly what you expect in terms
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of a markdown rendering. In fact, this is why marked could be considered at a
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disadvantage in the benchmarks above.
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Along with implementing every markdown feature, marked also implements [GFM
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features][gfmf].
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## Benchmarks
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node v0.8.x
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``` bash
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$ node test --bench
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marked completed in 3411ms.
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marked (gfm) completed in 3727ms.
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marked (pedantic) completed in 3201ms.
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robotskirt completed in 808ms.
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showdown (reuse converter) completed in 11954ms.
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showdown (new converter) completed in 17774ms.
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markdown-js completed in 17191ms.
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```
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__Marked is now faster than Discount, which is written in C.__
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For those feeling skeptical: These benchmarks run the entire markdown test suite 1000 times. The test suite tests every feature. It doesn't cater to specific aspects.
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### Pro level
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You also have direct access to the lexer and parser if you so desire.
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``` js
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var tokens = marked.lexer(text, options);
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console.log(marked.parser(tokens));
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```
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``` js
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var lexer = new marked.Lexer(options);
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var tokens = lexer.lex(text);
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console.log(tokens);
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console.log(lexer.rules);
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```
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``` bash
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$ node
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> require('marked').lexer('> i am using marked.')
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[ { type: 'blockquote_start' },
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{ type: 'paragraph',
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text: 'i am using marked.' },
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{ type: 'blockquote_end' },
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links: {} ]
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```
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## Running Tests & Contributing
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If you want to submit a pull request, make sure your changes pass the test
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suite. If you're adding a new feature, be sure to add your own test.
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The marked test suite is set up slightly strangely: `test/new` is for all tests
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that are not part of the original markdown.pl test suite (this is where your
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test should go if you make one). `test/original` is only for the original
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markdown.pl tests. `test/tests` houses both types of tests after they have been
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combined and moved/generated by running `node test --fix` or `marked --test
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--fix`.
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In other words, if you have a test to add, add it to `test/new/` and then
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regenerate the tests with `node test --fix`. Commit the result. If your test
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uses a certain feature, for example, maybe it assumes GFM is *not* enabled, you
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can add `.nogfm` to the filename. So, `my-test.text` becomes
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`my-test.nogfm.text`. You can do this with any marked option. Say you want
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line breaks and smartypants enabled, your filename should be:
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`my-test.breaks.smartypants.text`.
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To run the tests:
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``` bash
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cd marked/
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node test
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```
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### Contribution and License Agreement
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If you contribute code to this project, you are implicitly allowing your code
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to be distributed under the MIT license. You are also implicitly verifying that
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all code is your original work. `</legalese>`
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## License
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Copyright (c) 2011-2014, Christopher Jeffrey. (MIT License)
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See LICENSE for more info.
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[gfm]: https://help.github.com/articles/github-flavored-markdown
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[gfmf]: http://github.github.com/github-flavored-markdown/
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[pygmentize]: https://github.com/rvagg/node-pygmentize-bundled
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[highlight]: https://github.com/isagalaev/highlight.js
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[badge]: http://badge.fury.io/js/marked
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[tables]: https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet#wiki-tables
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[breaks]: https://help.github.com/articles/github-flavored-markdown#newlines
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