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anchors.js
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anchors.js
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/**
* Turn Markdown link shortcuts into XHTML <a> tags.
*/
showdown.subParser('anchors', function (text, options, globals) {
'use strict';
text = globals.converter._dispatch('anchors.before', text, options, globals);
var writeAnchorTag = function (wholeMatch, m1, m2, m3, m4, m5, m6, m7) {
if (showdown.helper.isUndefined(m7)) {
m7 = '';
}
wholeMatch = m1;
var linkText = m2,
linkId = m3.toLowerCase(),
url = m4,
title = m7;
if (!url) {
if (!linkId) {
// lower-case and turn embedded newlines into spaces
linkId = linkText.toLowerCase().replace(/ ?\n/g, ' ');
}
url = '#' + linkId;
if (!showdown.helper.isUndefined(globals.gUrls[linkId])) {
url = globals.gUrls[linkId];
if (!showdown.helper.isUndefined(globals.gTitles[linkId])) {
title = globals.gTitles[linkId];
}
} else {
if (wholeMatch.search(/\(\s*\)$/m) > -1) {
// Special case for explicit empty url
url = '';
} else {
return wholeMatch;
}
}
}
url = showdown.helper.escapeCharacters(url, '*_', false);
var result = '<a href="' + url + '"';
if (title !== '' && title !== null) {
title = title.replace(/"/g, '"');
title = showdown.helper.escapeCharacters(title, '*_', false);
result += ' title="' + title + '"';
}
result += '>' + linkText + '</a>';
return result;
};
// First, handle reference-style links: [link text] [id]
text = text.replace(/(\[((?:\[[^\]]*]|[^\[\]])*)][ ]?(?:\n[ ]*)?\[(.*?)])()()()()/g, writeAnchorTag);
// Next, inline-style links: [link text](url "optional title")
text = text.replace(/(\[((?:\[[^\]]*]|[^\[\]])*)]\([ \t]*()<?(.*?(?:\(.*?\).*?)?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,
writeAnchorTag);
// handle reference-style shortcuts: [link text]
// These must come last in case you've also got [link test][1]
// or [link test](/foo)
text = text.replace(/(\[([^\[\]]+)])()()()()()/g, writeAnchorTag);
// Lastly handle GithubMentions if option is enabled
if (options.ghMentions) {
text = text.replace(/(^|\s)(@([a-z\d\-]+))(?=[.!?;,[\]()]|\s|$)/gmi, '$1<a href="https://www.github.com/$3">$2</a>');
}
text = globals.converter._dispatch('anchors.after', text, options, globals);
return text;
});