Stackedit/js/extensions/markdownFootnotes.js
2013-06-23 00:48:57 +01:00

100 lines
3.7 KiB
JavaScript

define([
"underscore",
"utils",
"classes/Extension",
], function(_, utils, Extension) {
var markdownFootnotes = new Extension("markdownFootnotes", "Markdown Footnotes", true);
markdownFootnotes.settingsBlock = '<p>Adds support for Markdown footnotes.</p>';
var inlineTags = new RegExp([
'^(<\\/?(a|abbr|acronym|applet|area|b|basefont|',
'bdo|big|button|cite|code|del|dfn|em|figcaption|',
'font|i|iframe|img|input|ins|kbd|label|map|',
'mark|meter|object|param|progress|q|ruby|rp|rt|s|',
'samp|script|select|small|span|strike|strong|',
'sub|sup|textarea|time|tt|u|var|wbr)[^>]*>|',
'<(br)\\s?\\/?>)$'
].join(''), 'i');
var previousPostConversion = undefined;
markdownFootnotes.onEditorConfigure = function(editor) {
var converter = editor.getConverter();
previousPostConversion = converter.hooks.postConversion;
converter.hooks.chain("postNormalization", _StripFootnoteDefinitions);
converter.hooks.chain("postBlockGamut", _DoFootnotes);
converter.hooks.chain("postConversion", _PrintFootnotes);
};
var footnotes = undefined;
var usedFootnotes = undefined;
function _StripFootnoteDefinitions(text) {
footnotes = {};
usedFootnotes = [];
text = text.replace(/\n[ ]{0,3}\[\^(.+?)\]\:[ \t]*\n?(.*?)\n{1,2}((?=\n[ ]{0,3}\S)|\Z)/g, function(wholeMatch, m1, m2) {
m1 = utils.slugify(m1);
m2 += "\n";
m2 = m2.replace(/^[ ]{0,3}/gm, "");
footnotes[m1] = m2;
return "\n";
});
return text;
}
var blockGamutHookCallback = undefined;
function _DoFootnotes(text, blockGamutHookCallbackParam) {
blockGamutHookCallback = blockGamutHookCallbackParam;
var footnoteCounter = 0;
text = text.replace(/\[\^(.+?)\]/g, function(wholeMatch, m1) {
var id = utils.slugify(m1);
var footnote = footnotes[id];
if(footnote === undefined) {
return "";
}
footnoteCounter++;
usedFootnotes.push(id);
return '<a href="#fn:' + id + '" id="fnref:' + id + '" title="See footnote" class="footnote">' + footnoteCounter + '</a>';
});
return text;
}
function _PrintFootnotes(text) {
if(usedFootnotes.length === 0) {
return text;
}
_.each(footnotes, function(footnote, id) {
var formattedfootnote = blockGamutHookCallback(footnote);
formattedfootnote = unescapeSpecialChars(formattedfootnote);
formattedfootnote = formattedfootnote.replace(/~D/g, "$$").replace(/~T/g, "~");
formattedfootnote = previousPostConversion(formattedfootnote);
formattedfootnote = formattedfootnote.replace(/<[^>]*>?/gi, function(tag) {
return tag.match(inlineTags) ? tag : '';
});
footnotes[id] = formattedfootnote;
});
text += '\n\n<div class="footnotes">\n<hr>\n<ol>\n\n';
_.each(usedFootnotes, function(id) {
var footnote = footnotes[id];
text += '<li id="fn:' + id + '">' + footnote + ' <a href="#fnref:' + id + '" title="Return to article" class="reversefootnote">&#8617;</a></li>\n\n';
});
text += '</ol>\n</div>';
return text;
}
// Duplicated from PageDown converter
function unescapeSpecialChars(text) {
// Swap back in all the special characters we've hidden.
text = text.replace(/~E(\d+)E/g, function(wholeMatch, m1) {
var charCodeToReplace = parseInt(m1);
return String.fromCharCode(charCodeToReplace);
});
return text;
}
return markdownFootnotes;
});