stage3systems/node-html5-purifier

'use strict';
var css = require('css');
/**
 * Style Namespacer Prefixer.
 *
 * @impl prefix
 */

/**
 * Prefixes the given styles.
 *
 * @cb err, string
 */
function prepend(styles, prefix, cb) {
  // clean classes
  // /(\.|#)  find any period or hash symbol (css id or class symbol)
  // (-?[_a-z]+[_a-z0-9\-]*)  any valid class or id name
  // (?=[^}]+\{)/             get everything inside the style block { }
  // $1 = # or .
  // $2 = the class name we need to prefix
  var prefixed = styles.replace(/(\.|#)(-?[_a-z]+[_a-z0-9\-]*)(?=[^}]+\{)/ig, '$1' + prefix + '$2');

  cb(null, prefixed);
}

function strip(styles, prefix, cb) {
  var obj = css.parse(styles);
  var sheet = obj.stylesheet;
  var isReverted = false;
  sheet.rules.forEach(function(rule, ruleIndex) {
    if (rule.type === 'rule') {
      rule.selectors.forEach(function(selector, selectorIndex) {
        if (selector.indexOf(prefix) > -1 && selector !== prefix) {
          obj.stylesheet.rules[ruleIndex].selectors[selectorIndex] = selector.replace(prefix, '').trim();
          isReverted = true;
        }
      });
    }
  });
  cb(null, css.stringify(obj), isReverted);
}


exports.prepend = prepend;
exports.strip = strip;