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var is = require('is');
var Promise = require('../../utils/promise');
var editHTMLElement = require('./editHTMLElement');
/**
Return language for a code blocks from a list of class names
@param {Array<String>}
@return {String}
*/
function getLanguageForClass(classNames) {
return classNames
.map(function(cl) {
// Markdown
if (cl.search('lang-') === 0) {
return cl.slice('lang-'.length);
}
// Asciidoc
if (cl.search('language-') === 0) {
return cl.slice('language-'.length);
}
return null;
})
.find(function(cl) {
return Boolean(cl);
});
}
/**
Highlight all code elements
@param {Function(lang, body) -> String} highlight
@param {HTMLDom} $
@return {Promise}
*/
function highlightCode(highlight, $) {
return editHTMLElement($, 'code', function($code) {
var classNames = ($code.attr('class') || '').split(' ');
var lang = getLanguageForClass(classNames);
var source = $code.text();
return Promise(highlight(lang, source))
.then(function(r) {
if (is.string(r.html)) {
$code.html(r.html);
} else {
$code.text(r.text);
}
});
});
}
module.exports = highlightCode;
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