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import { AttributeAction, SelectorType } from "css-what";
const procedure = new Map([
[SelectorType.Universal, 50],
[SelectorType.Tag, 30],
[SelectorType.Attribute, 1],
[SelectorType.Pseudo, 0],
]);
export function isTraversal(token) {
return !procedure.has(token.type);
}
const attributes = new Map([
[AttributeAction.Exists, 10],
[AttributeAction.Equals, 8],
[AttributeAction.Not, 7],
[AttributeAction.Start, 6],
[AttributeAction.End, 6],
[AttributeAction.Any, 5],
]);
/**
* Sort the parts of the passed selector,
* as there is potential for optimization
* (some types of selectors are faster than others)
*
* @param arr Selector to sort
*/
export default function sortByProcedure(arr) {
const procs = arr.map(getProcedure);
for (let i = 1; i < arr.length; i++) {
const procNew = procs[i];
if (procNew < 0)
continue;
for (let j = i - 1; j >= 0 && procNew < procs[j]; j--) {
const token = arr[j + 1];
arr[j + 1] = arr[j];
arr[j] = token;
procs[j + 1] = procs[j];
procs[j] = procNew;
}
}
}
function getProcedure(token) {
var _a, _b;
let proc = (_a = procedure.get(token.type)) !== null && _a !== void 0 ? _a : -1;
if (token.type === SelectorType.Attribute) {
proc = (_b = attributes.get(token.action)) !== null && _b !== void 0 ? _b : 4;
if (token.action === AttributeAction.Equals && token.name === "id") {
// Prefer ID selectors (eg. #ID)
proc = 9;
}
if (token.ignoreCase) {
/*
* IgnoreCase adds some overhead, prefer "normal" token
* this is a binary operation, to ensure it's still an int
*/
proc >>= 1;
}
}
else if (token.type === SelectorType.Pseudo) {
if (!token.data) {
proc = 3;
}
else if (token.name === "has" || token.name === "contains") {
proc = 0; // Expensive in any case
}
else if (Array.isArray(token.data)) {
// Eg. :matches, :not
proc = Math.min(...token.data.map((d) => Math.min(...d.map(getProcedure))));
// If we have traversals, try to avoid executing this selector
if (proc < 0) {
proc = 0;
}
}
else {
proc = 2;
}
}
return proc;
}
//# sourceMappingURL=sort.js.map |