shift73k/assets_old/node_modules/csso/lib/restructure/prepare/index.js

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var resolveKeyword = require('css-tree').keyword;
var walk = require('css-tree').walk;
var generate = require('css-tree').generate;
var createDeclarationIndexer = require('./createDeclarationIndexer');
var processSelector = require('./processSelector');
module.exports = function prepare(ast, options) {
var markDeclaration = createDeclarationIndexer();
walk(ast, {
visit: 'Rule',
enter: function processRule(node) {
node.block.children.each(markDeclaration);
processSelector(node, options.usage);
}
});
walk(ast, {
visit: 'Atrule',
enter: function(node) {
if (node.prelude) {
node.prelude.id = null; // pre-init property to avoid multiple hidden class for generate
node.prelude.id = generate(node.prelude);
}
// compare keyframe selectors by its values
// NOTE: still no clarification about problems with keyframes selector grouping (issue #197)
if (resolveKeyword(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.each(function(rule) {
rule.prelude.children.each(function(simpleselector) {
simpleselector.compareMarker = simpleselector.id;
});
});
}
}
});
return {
declaration: markDeclaration
};
};