specificity.js
1.13 KB
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module.exports = function specificity(simpleSelector) {
var A = 0;
var B = 0;
var C = 0;
simpleSelector.sequence.each(function walk(data) {
switch (data.type) {
case 'SimpleSelector':
case 'Negation':
data.sequence.each(walk);
break;
case 'Id':
A++;
break;
case 'Class':
case 'Attribute':
case 'FunctionalPseudo':
B++;
break;
case 'Identifier':
if (data.name !== '*') {
C++;
}
break;
case 'PseudoElement':
C++;
break;
case 'PseudoClass':
var name = data.name.toLowerCase();
if (name === 'before' ||
name === 'after' ||
name === 'first-line' ||
name === 'first-letter') {
C++;
} else {
B++;
}
break;
}
});
return [A, B, C];
};