Current File : /home/opti/workflow/node_modules/juice/lib/selector.js
'use strict';
var parser = require('slick/parser');
module.exports = exports = Selector;
/**
* CSS selector constructor.
*
* @param {String} selector text
* @param {Array} optionally, precalculated specificity
* @api public
*/
function Selector(text, styleAttribute) {
this.text = text;
this.spec = undefined;
this.styleAttribute = styleAttribute || false;
}
/**
* Get parsed selector.
*
* @api public
*/
Selector.prototype.parsed = function() {
if (!this.tokens) { this.tokens = parse(this.text); }
return this.tokens;
};
/**
* Lazy specificity getter
*
* @api public
*/
Selector.prototype.specificity = function() {
var styleAttribute = this.styleAttribute;
if (!this.spec) { this.spec = specificity(this.text, this.parsed()); }
return this.spec;
function specificity(text, parsed) {
var expressions = parsed || parse(text);
var spec = [styleAttribute ? 1 : 0, 0, 0, 0];
var nots = [];
for (var i = 0; i < expressions.length; i++) {
var expression = expressions[i];
var pseudos = expression.pseudos;
// id awards a point in the second column
if (expression.id) { spec[1]++; }
// classes and attributes award a point each in the third column
if (expression.attributes) { spec[2] += expression.attributes.length; }
if (expression.classList) { spec[2] += expression.classList.length; }
// tag awards a point in the fourth column
if (expression.tag && expression.tag !== '*') { spec[3]++; }
// pseudos award a point each in the fourth column
if (pseudos) {
spec[3] += pseudos.length;
for (var p = 0; p < pseudos.length; p++) {
if (pseudos[p].name === 'not') {
nots.push(pseudos[p].value);
spec[3]--;
}
}
}
}
for (var ii = nots.length; ii--;) {
var not = specificity(nots[ii]);
for (var jj = 4; jj--;) { spec[jj] += not[jj]; }
}
return spec;
}
};
/**
* Parses a selector and returns the tokens.
*
* @param {String} selector
* @api private.
*/
function parse(text) {
try {
return parser(text)[0];
} catch (e) {
return [];
}
}
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