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187 righe
4.5 KiB
187 righe
4.5 KiB
/**
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* Module dependencies
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*/
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var serialize = require('dom-serializer'),
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select = require('css-select'),
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parse = require('./parse'),
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_ = {
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merge: require('lodash.merge'),
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defaults: require('lodash.defaults')
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};
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/**
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* $.load(str)
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*/
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exports.load = function(content, options) {
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var Cheerio = require('./cheerio');
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options = _.defaults(options || {}, Cheerio.prototype.options);
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var root = parse(content, options);
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var initialize = function(selector, context, r, opts) {
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if (!(this instanceof initialize)) {
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return new initialize(selector, context, r, opts);
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}
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opts = _.defaults(opts || {}, options);
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return Cheerio.call(this, selector, context, r || root, opts);
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};
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// Ensure that selections created by the "loaded" `initialize` function are
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// true Cheerio instances.
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initialize.prototype = Object.create(Cheerio.prototype);
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initialize.prototype.constructor = initialize;
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// Mimic jQuery's prototype alias for plugin authors.
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initialize.fn = initialize.prototype;
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// Keep a reference to the top-level scope so we can chain methods that implicitly
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// resolve selectors; e.g. $("<span>").(".bar"), which otherwise loses ._root
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initialize.prototype._originalRoot = root;
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// Add in the static methods
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_.merge(initialize, exports);
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// Add in the root
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initialize._root = root;
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// store options
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initialize._options = options;
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return initialize;
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};
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/*
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* Helper function
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*/
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function render(that, dom, options) {
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if (!dom) {
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if (that._root && that._root.children) {
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dom = that._root.children;
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} else {
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return '';
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}
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} else if (typeof dom === 'string') {
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dom = select(dom, that._root, options);
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}
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return serialize(dom, options);
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}
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/**
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* $.html([selector | dom], [options])
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*/
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exports.html = function(dom, options) {
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var Cheerio = require('./cheerio');
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// be flexible about parameters, sometimes we call html(),
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// with options as only parameter
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// check dom argument for dom element specific properties
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// assume there is no 'length' or 'type' properties in the options object
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if (Object.prototype.toString.call(dom) === '[object Object]' && !options && !('length' in dom) && !('type' in dom))
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{
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options = dom;
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dom = undefined;
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}
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// sometimes $.html() used without preloading html
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// so fallback non existing options to the default ones
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options = _.defaults(options || {}, this._options, Cheerio.prototype.options);
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return render(this, dom, options);
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};
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/**
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* $.xml([selector | dom])
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*/
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exports.xml = function(dom) {
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var options = _.defaults({xmlMode: true}, this._options);
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return render(this, dom, options);
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};
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/**
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* $.text(dom)
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*/
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exports.text = function(elems) {
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if (!elems) {
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elems = this.root();
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}
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var ret = '',
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len = elems.length,
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elem;
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for (var i = 0; i < len; i++) {
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elem = elems[i];
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if (elem.type === 'text') ret += elem.data;
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else if (elem.children && elem.type !== 'comment') {
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ret += exports.text(elem.children);
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}
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}
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return ret;
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};
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/**
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* $.parseHTML(data [, context ] [, keepScripts ])
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* Parses a string into an array of DOM nodes. The `context` argument has no
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* meaning for Cheerio, but it is maintained for API compatibility with jQuery.
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*/
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exports.parseHTML = function(data, context, keepScripts) {
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var parsed;
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if (!data || typeof data !== 'string') {
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return null;
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}
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if (typeof context === 'boolean') {
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keepScripts = context;
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}
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parsed = this.load(data);
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if (!keepScripts) {
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parsed('script').remove();
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}
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// The `children` array is used by Cheerio internally to group elements that
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// share the same parents. When nodes created through `parseHTML` are
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// inserted into previously-existing DOM structures, they will be removed
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// from the `children` array. The results of `parseHTML` should remain
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// constant across these operations, so a shallow copy should be returned.
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return parsed.root()[0].children.slice();
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};
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/**
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* $.root()
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*/
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exports.root = function() {
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return this(this._root);
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};
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/**
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* $.contains()
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*/
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exports.contains = function(container, contained) {
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// According to the jQuery API, an element does not "contain" itself
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if (contained === container) {
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return false;
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}
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// Step up the descendants, stopping when the root element is reached
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// (signaled by `.parent` returning a reference to the same object)
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while (contained && contained !== contained.parent) {
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contained = contained.parent;
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if (contained === container) {
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return true;
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}
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}
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return false;
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};
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