24 lines
507 B
JavaScript
24 lines
507 B
JavaScript
|
var utils = require('../utils');
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns true if the given selector exists.
|
||
|
|
*
|
||
|
|
* @param {String} sel
|
||
|
|
* @return {Boolean}
|
||
|
|
* @api public
|
||
|
|
*/
|
||
|
|
|
||
|
|
module.exports = function selectorExists(sel) {
|
||
|
|
utils.assertString(sel, 'selector');
|
||
|
|
|
||
|
|
if (!this.__selectorsMap__) {
|
||
|
|
var Normalizer = require('../visitor/normalizer')
|
||
|
|
, visitor = new Normalizer(this.root.clone());
|
||
|
|
visitor.visit(visitor.root);
|
||
|
|
|
||
|
|
this.__selectorsMap__ = visitor.map;
|
||
|
|
}
|
||
|
|
|
||
|
|
return sel.string in this.__selectorsMap__;
|
||
|
|
};
|