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var hasOwnProperty = Object.prototype.hasOwnProperty;
function cleanUnused(node, usageData) {
return node.selector.selectors.each(function(selector, item, list) {
var hasUnused = selector.sequence.some(function(node) {
switch (node.type) {
case 'Class':
return usageData.classes && !hasOwnProperty.call(usageData.classes, node.name);
case 'Id':
return usageData.ids && !hasOwnProperty.call(usageData.ids, node.name);
case 'Identifier':
// ignore universal selector
if (node.name !== '*') {
// TODO: remove toLowerCase when type selectors will be normalized
return usageData.tags && !hasOwnProperty.call(usageData.tags, node.name.toLowerCase());
}
break;
}
});
if (hasUnused) {
list.remove(item);
}
});
}
module.exports = function cleanRuleset(node, item, list, usageData) {
if (usageData) {
cleanUnused(node, usageData);
}
if (node.selector.selectors.isEmpty() ||
node.block.declarations.isEmpty()) {
list.remove(item);
}
};