138 function compatibilityFrom(source) {  argument
139   return merge(DEFAULTS['*'], calculateSource(source));
142 function merge(source, target) {  argument
143   for (var key in source) {
144     if (Object.prototype.hasOwnProperty.call(source, key)) {
145       var value = source[key];
158 function calculateSource(source) {  argument
159   if (typeof source == 'object')
160     return source;
162   if (!/[,\+\-]/.test(source))
163     return DEFAULTS[source] || DEFAULTS['*'];
165   var parts = source.split(',');
170   source = {};
178     source[group] = source[group] || {};
179     source[group][option] = isAdd;
182   return merge(template, source);