08-27-周三_17-09-29

node_modules/CSSselect/lib/sort.js

@@ -0,0 +1,59 @@
+module.exports = sortByProcedure;
+
+/*
+	sort the parts of the passed selector,
+	as there is potential for optimization
+	(some types of selectors are faster than others)
+*/
+
+var ATTRIBUTE = 1;
+
+var procedure = {
+	__proto__: null,
+	universal: 5, //should be last so that it can be ignored
+	tag: 3, //very quick test
+	attribute: ATTRIBUTE,
+	pseudo: 0, //can be pretty expensive (especially :has)
+
+	//everything else shouldn't be moved
+	descendant: -1,
+	child: -1,
+	parent: -1,
+	sibling: -1,
+	adjacent: -1
+};
+
+var attributes = {
+	__proto__: null,
+	exists: 8,
+	equals: 7,
+	not: 6,
+	start: 5,
+	end: 4,
+	any: 3,
+	hyphen: 2,
+	element: 1
+};
+
+function sortByProcedure(arr){
+	for(var i = 1; i < arr.length; i++){
+		var procNew = procedure[arr[i].type];
+
+		if(procNew < 0) continue;
+
+		for(var j = i - 1; j >= 0; j--){
+			if(
+				procNew > procedure[arr[j].type] || !(
+					procNew === ATTRIBUTE &&
+					procedure[arr[j].type] === ATTRIBUTE &&
+					attributes[arr[i].action] <= attributes[arr[j].action]
+				)
+			) break;
+
+			var tmp = arr[j + 1];
+			arr[j + 1] = arr[j];
+			arr[j] = tmp;
+		}
+	}
+	return arr;
+}