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122 lines
5.1 KiB
122 lines
5.1 KiB
2 years ago
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import { default as defaultOptions, flatten as flattenOptions, } from './options.js';
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import * as staticMethods from './static.js';
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import { Cheerio } from './cheerio.js';
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import { isHtml, isCheerio } from './utils.js';
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export function getLoad(parse, render) {
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/**
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* Create a querying function, bound to a document created from the provided markup.
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*
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* Note that similar to web browser contexts, this operation may introduce
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* `<html>`, `<head>`, and `<body>` elements; set `isDocument` to `false` to
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* switch to fragment mode and disable this.
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*
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* @param content - Markup to be loaded.
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* @param options - Options for the created instance.
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* @param isDocument - Allows parser to be switched to fragment mode.
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* @returns The loaded document.
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* @see {@link https://cheerio.js.org#loading} for additional usage information.
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*/
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return function load(content, options, isDocument = true) {
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if (content == null) {
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throw new Error('cheerio.load() expects a string');
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}
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const internalOpts = { ...defaultOptions, ...flattenOptions(options) };
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const initialRoot = parse(content, internalOpts, isDocument, null);
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/** Create an extended class here, so that extensions only live on one instance. */
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class LoadedCheerio extends Cheerio {
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_make(selector, context) {
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const cheerio = initialize(selector, context);
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cheerio.prevObject = this;
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return cheerio;
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}
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_parse(content, options, isDocument, context) {
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return parse(content, options, isDocument, context);
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}
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_render(dom) {
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return render(dom, this.options);
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}
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}
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function initialize(selector, context, root = initialRoot, opts) {
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// $($)
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if (selector && isCheerio(selector))
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return selector;
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const options = {
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...internalOpts,
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...flattenOptions(opts),
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};
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const r = typeof root === 'string'
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? [parse(root, options, false, null)]
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: 'length' in root
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? root
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: [root];
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const rootInstance = isCheerio(r)
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? r
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: new LoadedCheerio(r, null, options);
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// Add a cyclic reference, so that calling methods on `_root` never fails.
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rootInstance._root = rootInstance;
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// $(), $(null), $(undefined), $(false)
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if (!selector) {
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return new LoadedCheerio(undefined, rootInstance, options);
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}
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const elements = typeof selector === 'string' && isHtml(selector)
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? // $(<html>)
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parse(selector, options, false, null).children
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: isNode(selector)
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? // $(dom)
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[selector]
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: Array.isArray(selector)
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? // $([dom])
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selector
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: undefined;
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const instance = new LoadedCheerio(elements, rootInstance, options);
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if (elements) {
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return instance;
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}
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if (typeof selector !== 'string') {
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throw new Error('Unexpected type of selector');
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}
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// We know that our selector is a string now.
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let search = selector;
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const searchContext = !context
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? // If we don't have a context, maybe we have a root, from loading
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rootInstance
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: typeof context === 'string'
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? isHtml(context)
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? // $('li', '<ul>...</ul>')
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new LoadedCheerio([parse(context, options, false, null)], rootInstance, options)
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: // $('li', 'ul')
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((search = `${context} ${search}`), rootInstance)
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: isCheerio(context)
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? // $('li', $)
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context
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: // $('li', node), $('li', [nodes])
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new LoadedCheerio(Array.isArray(context) ? context : [context], rootInstance, options);
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// If we still don't have a context, return
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if (!searchContext)
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return instance;
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/*
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* #id, .class, tag
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*/
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return searchContext.find(search);
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}
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// Add in static methods & properties
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Object.assign(initialize, staticMethods, {
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load,
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// `_root` and `_options` are used in static methods.
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_root: initialRoot,
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_options: internalOpts,
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// Add `fn` for plugins
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fn: LoadedCheerio.prototype,
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// Add the prototype here to maintain `instanceof` behavior.
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prototype: LoadedCheerio.prototype,
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});
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return initialize;
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};
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}
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function isNode(obj) {
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return (!!obj.name ||
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obj.type === 'root' ||
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obj.type === 'text' ||
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obj.type === 'comment');
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}
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//# sourceMappingURL=load.js.map
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