初始化

node_modules/css-select/lib/helpers/selectors.js

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