discourse/app/assets/javascripts/pretty-text/engines/discourse-markdown/code.js.es6

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// we need a custom renderer for code blocks cause we have a slightly non compliant
// format with special handling for text and so on
const TEXT_CODE_CLASSES = ["text", "pre", "plain"];
function render(tokens, idx, options, env, slf, md) {
let token = tokens[idx],
info = token.info ? md.utils.unescapeAll(token.info) : '',
langName = md.options.discourse.defaultCodeLang,
className,
escapedContent = md.utils.escapeHtml(token.content);
if (info) {
// strip off any additional languages
info = info.split(/\s+/g)[0];
}
const acceptableCodeClasses = md.options.discourse.acceptableCodeClasses;
if (acceptableCodeClasses && info && acceptableCodeClasses.indexOf(info) !== -1) {
langName = info;
}
className = TEXT_CODE_CLASSES.indexOf(info) !== -1 ? 'lang-nohighlight' : 'lang-' + langName;
return `<pre><code class='${className}'>${escapedContent}</code></pre>\n`;
}
export function setup(helper) {
helper.registerOptions((opts, siteSettings) => {
opts.defaultCodeLang = siteSettings.default_code_lang;
opts.acceptableCodeClasses = (siteSettings.highlighted_languages || "").split("|").concat(['auto', 'nohighlight']);
});
helper.whiteList({
custom(tag, name, value) {
if (tag === 'code' && name === 'class') {
const m = /^lang\-(.+)$/.exec(value);
if (m) {
return helper.getOptions().acceptableCodeClasses.indexOf(m[1]) !== -1;
}
}
}
});
helper.registerPlugin(md=>{
md.renderer.rules.fence = (tokens,idx,options,env,slf)=>render(tokens,idx,options,env,slf,md);
});
}