/**
* downshow.js -- A javascript library to convert HTML to markdown.
*
* Copyright (c) 2013 Alex Cornejo.
*
* Original Markdown Copyright (c) 2004-2005 John Gruber
*
*
* Redistributable under a BSD-style open source license.
*
* downshow has no external dependencies. It has been tested in chrome and
* firefox, it probably works in internet explorer, but YMMV.
*
* Basic Usage:
*
* downshow(document.getElementById('#yourid').innerHTML);
*
* TODO:
* - Remove extra whitespace between words in headers and other places.
*/
(function () {
var doc;
// Use browser DOM with jsdom as a fallback (for node.js)
try {
doc = document;
} catch(e) {
var jsdom = require("jsdom").jsdom;
doc = jsdom("");
}
/**
* Returns every element in root in their bfs traversal order.
*
* In the process it transforms any nested lists to conform to the w3c
* standard, see: http://www.w3.org/wiki/HTML_lists#Nesting_lists
*/
function bfsOrder(root) {
var inqueue = [root], outqueue = [];
root._bfs_parent = null;
while (inqueue.length > 0) {
var elem = inqueue.shift();
outqueue.push(elem);
var children = elem.childNodes;
var liParent = null;
for (var i=0 ; i 0) {
if (prefix && suffix)
node._bfs_text = prefix + content + suffix;
else
node._bfs_text = content;
} else
node._bfs_text = '';
}
/**
* Get a node's content.
*/
function getContent(node) {
var text = '', atom;
for (var i = 0; i 0)
setContent(node, '[' + text + '](' + href + (title ? ' "' + title + '"' : '') + ')');
else
setContent(node, '');
} else if (node.tagName === 'IMG') {
var src = node.getAttribute('src') ? nltrim(node.getAttribute('src')) : '', alt = node.alt ? nltrim(node.alt) : '', caption = node.title ? nltrim(node.title) : '';
if (src.length > 0)
setContent(node, '![' + alt + '](' + src + (caption ? ' "' + caption + '"' : '') + ')');
else
setContent(node, '');
} else if (node.tagName === 'BLOCKQUOTE') {
var block_content = getContent(node);
if (block_content.length > 0)
setContent(node, prefixBlock('> ', block_content), '\n\n', '\n\n');
else
setContent(node, '');
} else if (node.tagName === 'CODE') {
if (node._bfs_parent.tagName === 'PRE' && node._bfs_parent._bfs_parent !== null)
setContent(node, prefixBlock(' ', getContent(node)));
else
setContent(node, nltrim(getContent(node)), '`', '`');
} else if (node.tagName === 'LI') {
var list_content = getContent(node);
if (list_content.length > 0)
if (node._bfs_parent.tagName === 'OL')
setContent(node, trim(prefixBlock(' ', list_content, true)), '1. ', '\n\n');
else
setContent(node, trim(prefixBlock(' ', list_content, true)), '- ', '\n\n');
else
setContent(node, '');
} else
setContent(node, getContent(node));
}
function downshow(html, options) {
var root = doc.createElement('pre');
root.innerHTML = html;
var nodes = bfsOrder(root).reverse(), i;
if (options && options.nodeParser) {
for (i = 0; i )+[^\n]*)\n+(\n(?:> )+)/g, "$1\n$2")
// remove empty blockquotes
.replace(/\n((?:> )+[ ]*\n)+/g, '\n\n')
// remove extra newlines
.replace(/\n[ \t]*(?:\n[ \t]*)+\n/g,'\n\n')
// remove trailing whitespace
.replace(/\s\s*$/, '')
// convert lists to inline when not using paragraphs
.replace(/^([ \t]*(?:\d+\.|\+|\-)[^\n]*)\n\n+(?=[ \t]*(?:\d+\.|\+|\-|\*)[^\n]*)/gm, "$1\n")
// remove starting newlines
.replace(/^\n\n*/, '');
}
// Export for use in server and client.
if (typeof module !== 'undefined' && typeof module.exports !== 'undefined')
module.exports = downshow;
else if (typeof define === 'function' && define.amd)
define([], function () {return downshow;});
else
window.downshow = downshow;
})();