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// Released under MIT license // Copyright (c) 2009-2010 Dominic Baggott // Copyright (c) 2009-2010 Ash Berlin // Copyright (c) 2011 Christoph Dorn <christoph@christophdorn.com> (http://www.christophdorn.com) /*jshint browser:true, devel:true */ (function( expose ) { /** * class Markdown * * Markdown processing in Javascript done right. We have very particular views * on what constitutes 'right' which include: * * - produces well-formed HTML (this means that em and strong nesting is * important) * * - has an intermediate representation to allow processing of parsed data (We * in fact have two, both as [JsonML]: a markdown tree and an HTML tree). * * - is easily extensible to add new dialects without having to rewrite the * entire parsing mechanics * * - has a good test suite * * This implementation fulfills all of these (except that the test suite could * do with expanding to automatically run all the fixtures from other Markdown * implementations.) * * ##### Intermediate Representation * * *TODO* Talk about this :) Its JsonML, but document the node names we use. * * [JsonML]: http://jsonml.org/ "JSON Markup Language" **/ var Markdown = expose.Markdown = function(dialect) { switch (typeof dialect) { case "undefined": this.dialect = Markdown.dialects.Gruber; break; case "object": this.dialect = dialect; break; default: if ( dialect in Markdown.dialects ) { this.dialect = Markdown.dialects[dialect]; } else { throw new Error("Unknown Markdown dialect '" + String(dialect) + "'"); } break; } this.em_state = []; this.strong_state = []; this.debug_indent = ""; }; /** * parse( markdown, [dialect] ) -> JsonML * - markdown (String): markdown string to parse * - dialect (String | Dialect): the dialect to use, defaults to gruber * * Parse `markdown` and return a markdown document as a Markdown.JsonML tree. **/ expose.parse = function( source, dialect ) { // dialect will default if undefined var md = new Markdown( dialect ); return md.toTree( source ); }; /** * toHTML( markdown, [dialect] ) -> String * toHTML( md_tree ) -> String * - markdown (String): markdown string to parse * - md_tree (Markdown.JsonML): parsed markdown tree * * Take markdown (either as a string or as a JsonML tree) and run it through * [[toHTMLTree]] then turn it into a well-formated HTML fragment. **/ expose.toHTML = function toHTML( source , dialect , options ) { var input = expose.toHTMLTree( source , dialect , options ); return expose.renderJsonML( input ); }; /** * toHTMLTree( markdown, [dialect] ) -> JsonML * toHTMLTree( md_tree ) -> JsonML * - markdown (String): markdown string to parse * - dialect (String | Dialect): the dialect to use, defaults to gruber * - md_tree (Markdown.JsonML): parsed markdown tree * * Turn markdown into HTML, represented as a JsonML tree. If a string is given * to this function, it is first parsed into a markdown tree by calling * [[parse]]. **/ expose.toHTMLTree = function toHTMLTree( input, dialect , options ) { // convert string input to an MD tree if ( typeof input ==="string" ) input = this.parse( input, dialect ); // Now convert the MD tree to an HTML tree // remove references from the tree var attrs = extract_attr( input ), refs = {}; if ( attrs && attrs.references ) { refs = attrs.references; } var html = convert_tree_to_html( input, refs , options ); merge_text_nodes( html ); return html; }; // For Spidermonkey based engines function mk_block_toSource() { return "Markdown.mk_block( " + uneval(this.toString()) + ", " + uneval(this.trailing) + ", " + uneval(this.lineNumber) + " )"; } // node function mk_block_inspect() { var util = require("util"); return "Markdown.mk_block( " + util.inspect(this.toString()) + ", " + util.inspect(this.trailing) + ", " + util.inspect(this.lineNumber) + " )"; } var mk_block = Markdown.mk_block = function(block, trail, line) { // Be helpful for default case in tests. if ( arguments.length == 1 ) trail = "\n\n"; var s = new String(block); s.trailing = trail; // To make it clear its not just a string s.inspect = mk_block_inspect; s.toSource = mk_block_toSource; if ( line != undefined ) s.lineNumber = line; return s; }; function count_lines( str ) { var n = 0, i = -1; while ( ( i = str.indexOf("\n", i + 1) ) !== -1 ) n++; return n; } // Internal - split source into rough blocks Markdown.prototype.split_blocks = function splitBlocks( input, startLine ) { input = input.replace(/(\r\n|\n|\r)/g, "\n"); // [\s\S] matches _anything_ (newline or space) // [^] is equivalent but doesn't work in IEs. var re = /([\s\S]+?)($|\n#|\n(?:\s*\n|$)+)/g, blocks = [], m; var line_no = 1; if ( ( m = /^(\s*\n)/.exec(input) ) != null ) { // skip (but count) leading blank lines line_no += count_lines( m[0] ); re.lastIndex = m[0].length; } while ( ( m = re.exec(input) ) !== null ) { if (m[2] == "\n#") { m[2] = "\n"; re.lastIndex--; } blocks.push( mk_block( m[1], m[2], line_no ) ); line_no += count_lines( m[0] ); } return blocks; }; /** * Markdown#processBlock( block, next ) -> undefined | [ JsonML, ... ] * - block (String): the block to process * - next (Array): the following blocks * * Process `block` and return an array of JsonML nodes representing `block`. * * It does this by asking each block level function in the dialect to process * the block until one can. Succesful handling is indicated by returning an * array (with zero or more JsonML nodes), failure by a false value. * * Blocks handlers are responsible for calling [[Markdown#processInline]] * themselves as appropriate. * * If the blocks were split incorrectly or adjacent blocks need collapsing you * can adjust `next` in place using shift/splice etc. * * If any of this default behaviour is not right for the dialect, you can * define a `__call__` method on the dialect that will get invoked to handle * the block processing. */ Markdown.prototype.processBlock = function processBlock( block, next ) { var cbs = this.dialect.block, ord = cbs.__order__; if ( "__call__" in cbs ) { return cbs.__call__.call(this, block, next); } for ( var i = 0; i < ord.length; i++ ) { //D:this.debug( "Testing", ord[i] ); var res = cbs[ ord[i] ].call( this, block, next ); if ( res ) { //D:this.debug(" matched"); if ( !isArray(res) || ( res.length > 0 && !( isArray(res[0]) ) ) ) this.debug(ord[i], "didn't return a proper array"); //D:this.debug( "" ); return res; } } // Uhoh! no match! Should we throw an error? return []; }; Markdown.prototype.processInline = function processInline( block ) { return this.dialect.inline.__call__.call( this, String( block ) ); }; /** * Markdown#toTree( source ) -> JsonML * - source (String): markdown source to parse * * Parse `source` into a JsonML tree representing the markdown document. **/ // custom_tree means set this.tree to `custom_tree` and restore old value on return Markdown.prototype.toTree = function toTree( source, custom_root ) { var blocks = source instanceof Array ? source : this.split_blocks( source ); // Make tree a member variable so its easier to mess with in extensions var old_tree = this.tree; try { this.tree = custom_root || this.tree || [ "markdown" ]; blocks: while ( blocks.length ) { var b = this.processBlock( blocks.shift(), blocks ); // Reference blocks and the like won't return any content if ( !b.length ) continue blocks; this.tree.push.apply( this.tree, b ); } return this.tree; } finally { if ( custom_root ) { thi