49 lines
1.7 KiB
JavaScript
Executable File
49 lines
1.7 KiB
JavaScript
Executable File
var utils = require('./utils.js');
|
|
var walkRules = require('../../utils/walk.js').rules;
|
|
|
|
function processRuleset(node, item, list) {
|
|
var selectors = node.selector.selectors;
|
|
var declarations = node.block.declarations;
|
|
|
|
list.prevUntil(item.prev, function(prev) {
|
|
// skip non-ruleset node if safe
|
|
if (prev.type !== 'Ruleset') {
|
|
return utils.unsafeToSkipNode.call(selectors, prev);
|
|
}
|
|
|
|
var prevSelectors = prev.selector.selectors;
|
|
var prevDeclarations = prev.block.declarations;
|
|
|
|
// try to join rulesets with equal pseudo signature
|
|
if (node.pseudoSignature === prev.pseudoSignature) {
|
|
// try to join by selectors
|
|
if (utils.isEqualLists(prevSelectors, selectors)) {
|
|
prevDeclarations.appendList(declarations);
|
|
list.remove(item);
|
|
return true;
|
|
}
|
|
|
|
// try to join by declarations
|
|
if (utils.isEqualDeclarations(declarations, prevDeclarations)) {
|
|
utils.addSelectors(prevSelectors, selectors);
|
|
list.remove(item);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// go to prev ruleset if has no selector similarities
|
|
return utils.hasSimilarSelectors(selectors, prevSelectors);
|
|
});
|
|
};
|
|
|
|
// NOTE: direction should be left to right, since rulesets merge to left
|
|
// ruleset. When direction right to left unmerged rulesets may prevent lookup
|
|
// TODO: remove initial merge
|
|
module.exports = function initialMergeRuleset(ast) {
|
|
walkRules(ast, function(node, item, list) {
|
|
if (node.type === 'Ruleset') {
|
|
processRuleset(node, item, list);
|
|
}
|
|
});
|
|
};
|