vue hello world项目
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var generate = require('css-tree').generate;
var specificity = require('./specificity');
var nonFreezePseudoElements = {
'first-letter': true,
'first-line': true,
'after': true,
'before': true
};
var nonFreezePseudoClasses = {
'link': true,
'visited': true,
'hover': true,
'active': true,
'first-letter': true,
'first-line': true,
'after': true,
'before': true
};
module.exports = function freeze(node, usageData) {
var pseudos = Object.create(null);
var hasPseudo = false;
node.prelude.children.each(function(simpleSelector) {
var tagName = '*';
var scope = 0;
simpleSelector.children.each(function(node) {
switch (node.type) {
case 'ClassSelector':
if (usageData && usageData.scopes) {
var 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':
var name = node.name.toLowerCase();
if (!nonFreezePseudoClasses.hasOwnProperty(name)) {
pseudos[':' + name] = true;
hasPseudo = true;
}
break;
case 'PseudoElementSelector':
var name = node.name.toLowerCase();
if (!nonFreezePseudoElements.hasOwnProperty(name)) {
pseudos['::' + name] = true;
hasPseudo = true;
}
break;
case 'TypeSelector':
tagName = node.name.toLowerCase();
break;
case 'AttributeSelector':
if (node.flags) {
pseudos['[' + node.flags.toLowerCase() + ']'] = true;
hasPseudo = true;
}
break;
case 'WhiteSpace':
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 = hasPseudo && Object.keys(pseudos).sort().join(',');
};