111 lines
3.7 KiB
JavaScript
111 lines
3.7 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.isTraversal = isTraversal;
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exports.sortRules = sortRules;
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exports.getQuality = getQuality;
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exports.includesScopePseudo = includesScopePseudo;
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var css_what_1 = require("css-what");
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function isTraversal(token) {
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return token.type === "_flexibleDescendant" || (0, css_what_1.isTraversal)(token);
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}
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/**
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* Sort the parts of the passed selector, as there is potential for
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* optimization (some types of selectors are faster than others).
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*
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* @param arr Selector to sort
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*/
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function sortRules(arr) {
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var ratings = arr.map(getQuality);
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for (var i = 1; i < arr.length; i++) {
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var procNew = ratings[i];
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if (procNew < 0)
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continue;
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// Use insertion sort to move the token to the correct position.
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for (var j = i; j > 0 && procNew < ratings[j - 1]; j--) {
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var token = arr[j];
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arr[j] = arr[j - 1];
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arr[j - 1] = token;
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ratings[j] = ratings[j - 1];
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ratings[j - 1] = procNew;
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}
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}
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}
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function getAttributeQuality(token) {
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switch (token.action) {
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case css_what_1.AttributeAction.Exists: {
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return 10;
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}
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case css_what_1.AttributeAction.Equals: {
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// Prefer ID selectors (eg. #ID)
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return token.name === "id" ? 9 : 8;
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}
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case css_what_1.AttributeAction.Not: {
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return 7;
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}
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case css_what_1.AttributeAction.Start: {
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return 6;
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}
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case css_what_1.AttributeAction.End: {
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return 6;
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}
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case css_what_1.AttributeAction.Any: {
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return 5;
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}
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case css_what_1.AttributeAction.Hyphen: {
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return 4;
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}
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case css_what_1.AttributeAction.Element: {
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return 3;
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}
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}
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}
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/**
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* Determine the quality of the passed token. The higher the number, the
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* faster the token is to execute.
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*
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* @param token Token to get the quality of.
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* @returns The token's quality.
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*/
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function getQuality(token) {
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// eslint-disable-next-line @typescript-eslint/switch-exhaustiveness-check
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switch (token.type) {
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case css_what_1.SelectorType.Universal: {
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return 50;
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}
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case css_what_1.SelectorType.Tag: {
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return 30;
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}
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case css_what_1.SelectorType.Attribute: {
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return Math.floor(getAttributeQuality(token) /
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// `ignoreCase` adds some overhead, half the result if applicable.
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(token.ignoreCase ? 2 : 1));
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}
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case css_what_1.SelectorType.Pseudo: {
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return !token.data
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? 3
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: token.name === "has" ||
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token.name === "contains" ||
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token.name === "icontains"
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? // Expensive in any case — run as late as possible.
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0
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: Array.isArray(token.data)
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? // Eg. `:is`, `:not`
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Math.max(
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// If we have traversals, try to avoid executing this selector
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0, Math.min.apply(Math, token.data.map(function (d) {
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return Math.min.apply(Math, d.map(getQuality));
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})))
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: 2;
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}
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default: {
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return -1;
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}
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}
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}
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function includesScopePseudo(t) {
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return (t.type === css_what_1.SelectorType.Pseudo &&
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(t.name === "scope" ||
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(Array.isArray(t.data) &&
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t.data.some(function (data) { return data.some(includesScopePseudo); }))));
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}
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//# sourceMappingURL=selectors.js.map
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