calebthebrewer/gulp-selectors

var expressions = require('../utils/expressions');

/**
 * Replaces all class and id attributes found in the library. Only tested on *.html files with
 * classes declared in *class= attributes.
 *
 * @param {string} File
 * @returns {string} Minified file
 */
module.exports = function (file, classLibrary, idLibrary) {
    return file.replace(expressions.elementAttribute, function(attributes) {
        var attribute = attributes.split('=');
        return attribute[0] + '=' + attribute[1]
            .replace(expressions.selectorName, function(selectorName) {
                switch (attribute[0]) {
                    case 'id':
                    case 'for':
                        return idLibrary.get(selectorName);
                    default: //class
                        return classLibrary.get(selectorName);
                }
            });
    });
};