309 lines
8.8 KiB
TypeScript
309 lines
8.8 KiB
TypeScript
/**
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* Copyright 2023 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import type {AwaitableIterable} from '../common/types.js';
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import {AsyncIterableUtil} from '../util/AsyncIterableUtil.js';
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import {ariaQuerySelectorAll} from './ARIAQuerySelector.js';
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import {customQuerySelectors} from './CustomQuerySelector.js';
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import {
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ComplexPSelector,
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ComplexPSelectorList,
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CompoundPSelector,
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CSSSelector,
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parsePSelectors,
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PCombinator,
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PPseudoSelector,
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} from './PSelectorParser.js';
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import {textQuerySelectorAll} from './TextQuerySelector.js';
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import {pierce, pierceAll} from './util.js';
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import {xpathQuerySelectorAll} from './XPathQuerySelector.js';
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const IDENT_TOKEN_START = /[-\w\P{ASCII}*]/;
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interface QueryableNode extends Node {
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querySelectorAll: typeof Document.prototype.querySelectorAll;
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}
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const isQueryableNode = (node: Node): node is QueryableNode => {
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return 'querySelectorAll' in node;
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};
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class SelectorError extends Error {
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constructor(selector: string, message: string) {
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super(`${selector} is not a valid selector: ${message}`);
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}
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}
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class PQueryEngine {
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#input: string;
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#complexSelector: ComplexPSelector;
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#compoundSelector: CompoundPSelector = [];
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#selector: CSSSelector | PPseudoSelector | undefined = undefined;
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elements: AwaitableIterable<Node>;
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constructor(element: Node, input: string, complexSelector: ComplexPSelector) {
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this.elements = [element];
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this.#input = input;
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this.#complexSelector = complexSelector;
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this.#next();
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}
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async run(): Promise<void> {
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if (typeof this.#selector === 'string') {
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switch (this.#selector.trimStart()) {
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case ':scope':
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// `:scope` has some special behavior depending on the node. It always
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// represents the current node within a compound selector, but by
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// itself, it depends on the node. For example, Document is
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// represented by `<html>`, but any HTMLElement is not represented by
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// itself (i.e. `null`). This can be troublesome if our combinators
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// are used right after so we treat this selector specially.
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this.#next();
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break;
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}
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}
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for (; this.#selector !== undefined; this.#next()) {
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const selector = this.#selector;
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const input = this.#input;
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if (typeof selector === 'string') {
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// The regular expression tests if the selector is a type/universal
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// selector. Any other case means we want to apply the selector onto
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// the element itself (e.g. `element.class`, `element>div`,
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// `element:hover`, etc.).
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if (selector[0] && IDENT_TOKEN_START.test(selector[0])) {
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this.elements = AsyncIterableUtil.flatMap(
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this.elements,
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async function* (element) {
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if (isQueryableNode(element)) {
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yield* element.querySelectorAll(selector);
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}
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}
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);
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} else {
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this.elements = AsyncIterableUtil.flatMap(
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this.elements,
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async function* (element) {
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if (!element.parentElement) {
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if (!isQueryableNode(element)) {
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return;
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}
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yield* element.querySelectorAll(selector);
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return;
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}
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let index = 0;
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for (const child of element.parentElement.children) {
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++index;
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if (child === element) {
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break;
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}
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}
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yield* element.parentElement.querySelectorAll(
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`:scope>:nth-child(${index})${selector}`
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);
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}
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);
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}
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} else {
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this.elements = AsyncIterableUtil.flatMap(
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this.elements,
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async function* (element) {
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switch (selector.name) {
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case 'text':
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yield* textQuerySelectorAll(element, selector.value);
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break;
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case 'xpath':
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yield* xpathQuerySelectorAll(element, selector.value);
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break;
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case 'aria':
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yield* ariaQuerySelectorAll(element, selector.value);
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break;
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default:
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const querySelector = customQuerySelectors.get(selector.name);
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if (!querySelector) {
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throw new SelectorError(
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input,
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`Unknown selector type: ${selector.name}`
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);
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}
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yield* querySelector.querySelectorAll(element, selector.value);
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}
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}
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);
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}
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}
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}
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#next() {
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if (this.#compoundSelector.length !== 0) {
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this.#selector = this.#compoundSelector.shift();
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return;
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}
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if (this.#complexSelector.length === 0) {
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this.#selector = undefined;
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return;
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}
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const selector = this.#complexSelector.shift();
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switch (selector) {
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case PCombinator.Child: {
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this.elements = AsyncIterableUtil.flatMap(this.elements, pierce);
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this.#next();
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break;
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}
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case PCombinator.Descendent: {
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this.elements = AsyncIterableUtil.flatMap(this.elements, pierceAll);
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this.#next();
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break;
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}
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default:
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this.#compoundSelector = selector as CompoundPSelector;
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this.#next();
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break;
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}
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}
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}
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class DepthCalculator {
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#cache = new WeakMap<Node, number[]>();
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calculate(node: Node | null, depth: number[] = []): number[] {
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if (node === null) {
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return depth;
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}
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if (node instanceof ShadowRoot) {
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node = node.host;
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}
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const cachedDepth = this.#cache.get(node);
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if (cachedDepth) {
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return [...cachedDepth, ...depth];
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}
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let index = 0;
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for (
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let prevSibling = node.previousSibling;
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prevSibling;
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prevSibling = prevSibling.previousSibling
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) {
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++index;
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}
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const value = this.calculate(node.parentNode, [index]);
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this.#cache.set(node, value);
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return [...value, ...depth];
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}
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}
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const compareDepths = (a: number[], b: number[]): -1 | 0 | 1 => {
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if (a.length + b.length === 0) {
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return 0;
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}
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const [i = -1, ...otherA] = a;
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const [j = -1, ...otherB] = b;
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if (i === j) {
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return compareDepths(otherA, otherB);
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}
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return i < j ? -1 : 1;
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};
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const domSort = async function* (elements: AwaitableIterable<Node>) {
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const results = new Set<Node>();
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for await (const element of elements) {
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results.add(element);
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}
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const calculator = new DepthCalculator();
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yield* [...results.values()]
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.map(result => {
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return [result, calculator.calculate(result)] as const;
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})
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.sort(([, a], [, b]) => {
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return compareDepths(a, b);
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})
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.map(([result]) => {
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return result;
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});
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};
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/**
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* Queries the given node for all nodes matching the given text selector.
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*
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* @internal
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*/
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export const pQuerySelectorAll = function (
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root: Node,
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selector: string
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): AwaitableIterable<Node> {
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let selectors: ComplexPSelectorList;
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let isPureCSS: boolean;
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try {
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[selectors, isPureCSS] = parsePSelectors(selector);
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} catch (error) {
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return (root as unknown as QueryableNode).querySelectorAll(selector);
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}
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if (isPureCSS) {
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return (root as unknown as QueryableNode).querySelectorAll(selector);
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}
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// If there are any empty elements, then this implies the selector has
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// contiguous combinators (e.g. `>>> >>>>`) or starts/ends with one which we
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// treat as illegal, similar to existing behavior.
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if (
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selectors.some(parts => {
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let i = 0;
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return parts.some(parts => {
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if (typeof parts === 'string') {
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++i;
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} else {
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i = 0;
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}
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return i > 1;
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});
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})
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) {
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throw new SelectorError(
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selector,
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'Multiple deep combinators found in sequence.'
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);
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}
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return domSort(
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AsyncIterableUtil.flatMap(selectors, selectorParts => {
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const query = new PQueryEngine(root, selector, selectorParts);
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void query.run();
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return query.elements;
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})
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);
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};
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/**
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* Queries the given node for all nodes matching the given text selector.
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*
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* @internal
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*/
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export const pQuerySelector = async function (
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root: Node,
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selector: string
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): Promise<Node | null> {
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for await (const element of pQuerySelectorAll(root, selector)) {
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return element;
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}
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return null;
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};
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