index.cjs•1.57 kB
'use strict';
const cssTree = require('css-tree');
const createDeclarationIndexer = require('./createDeclarationIndexer.cjs');
const processSelector = require('./processSelector.cjs');
function prepare(ast, options) {
const markDeclaration = createDeclarationIndexer();
cssTree.walk(ast, {
visit: 'Rule',
enter(node) {
node.block.children.forEach(markDeclaration);
processSelector(node, options.usage);
}
});
cssTree.walk(ast, {
visit: 'Atrule',
enter(node) {
if (node.prelude) {
node.prelude.id = null; // pre-init property to avoid multiple hidden class for generate
node.prelude.id = cssTree.generate(node.prelude);
}
// compare keyframe selectors by its values
// NOTE: still no clarification about problems with keyframes selector grouping (issue #197)
if (cssTree.keyword(node.name).basename === 'keyframes') {
node.block.avoidRulesMerge = true; /* probably we don't need to prevent those merges for @keyframes
TODO: need to be checked */
node.block.children.forEach(function(rule) {
rule.prelude.children.forEach(function(simpleselector) {
simpleselector.compareMarker = simpleselector.id;
});
});
}
}
});
return {
declaration: markDeclaration
};
}
module.exports = prepare;