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import { generate } from 'css-tree';
import specificity from './specificity.js';
const nonFreezePseudoElements = new Set([
'first-letter',
'first-line',
'after',
'before'
]);
const nonFreezePseudoClasses = new Set([
'link',
'visited',
'hover',
'active',
'first-letter',
'first-line',
'after',
'before'
]);
export default function processSelector(node, usageData) {
const pseudos = new Set();
node.prelude.children.forEach(function(simpleSelector) {
let tagName = '*';
let scope = 0;
simpleSelector.children.forEach(function(node) {
switch (node.type) {
case 'ClassSelector':
if (usageData && usageData.scopes) {
const classScope = usageData.scopes[node.name] || 0;
if (scope !== 0 && classScope !== scope) {
throw new Error('Selector can\'t has classes from different scopes: ' + generate(simpleSelector));
}
scope = classScope;
}
break;
case 'PseudoClassSelector': {
const name = node.name.toLowerCase();
if (!nonFreezePseudoClasses.has(name)) {
pseudos.add(`:${name}`);
}
break;
}
case 'PseudoElementSelector': {
const name = node.name.toLowerCase();
if (!nonFreezePseudoElements.has(name)) {
pseudos.add(`::${name}`);
}
break;
}
case 'TypeSelector':
tagName = node.name.toLowerCase();
break;
case 'AttributeSelector':
if (node.flags) {
pseudos.add(`[${node.flags.toLowerCase()}]`);
}
break;
case 'Combinator':
tagName = '*';
break;
}
});
simpleSelector.compareMarker = specificity(simpleSelector).toString();
simpleSelector.id = null; // pre-init property to avoid multiple hidden class
simpleSelector.id = generate(simpleSelector);
if (scope) {
simpleSelector.compareMarker += ':' + scope;
}
if (tagName !== '*') {
simpleSelector.compareMarker += ',' + tagName;
}
});
// add property to all rule nodes to avoid multiple hidden class
node.pseudoSignature = pseudos.size > 0
? [...pseudos].sort().join(',')
: false;
};
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