144 lines
2.8 KiB
JavaScript
144 lines
2.8 KiB
JavaScript
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/*
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Module dependencies
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*/
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var path = require('path'),
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select = require('cheerio-select'),
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parse = require('./parse'),
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evaluate = parse.evaluate,
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updateDOM = parse.update,
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_ = require('underscore');
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/*
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* The API
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*/
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var api = ['attributes', 'traversing', 'manipulation'];
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/*
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* A simple way to check for HTML strings or ID strings
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*/
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var quickExpr = /^(?:[^#<]*(<[\w\W]+>)[^>]*$|#([\w\-]*)$)/;
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/**
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* Static Methods
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*/
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var $ = require('./static');
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/*
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* Instance of cheerio
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*/
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var Cheerio = module.exports = function(selector, context, root) {
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if (!(this instanceof Cheerio)) return new Cheerio(selector, context, root);
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// $(), $(null), $(undefined), $(false)
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if (!selector) return this;
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if (root) {
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if (typeof root === 'string') root = parse(root);
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this._root = this.make(root, this);
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}
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// $($)
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if (selector.cheerio) return selector;
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// $(dom)
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if (selector.name || Array.isArray(selector))
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return this.make(selector, this);
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// $(<html>)
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if (typeof selector === 'string' && isHtml(selector)) {
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return this.make(parse(selector).children);
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}
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// If we don't have a context, maybe we have a root, from loading
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if (!context) {
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context = this._root;
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} else if (typeof context === 'string') {
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if (isHtml(context)) {
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// $('li', '<ul>...</ul>')
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context = parse(context);
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context = this.make(context, this);
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} else {
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// $('li', 'ul')
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selector = [context, selector].join(' ');
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context = this._root;
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}
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}
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// If we still don't have a context, return
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if (!context) return this;
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// #id, .class, tag
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return context.parent().find(selector);
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};
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/**
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* Inherit from `static`
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*/
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Cheerio.__proto__ = require('./static');
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/*
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* Set a signature of the object
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*/
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Cheerio.prototype.cheerio = '[cheerio object]';
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/*
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* Cheerio default options
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*/
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Cheerio.prototype.options = {
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ignoreWhitespace: false,
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xmlMode: false,
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lowerCaseTags: false
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};
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/*
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* Make cheerio an array-like object
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*/
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Cheerio.prototype.length = 0;
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Cheerio.prototype.sort = [].splice;
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/*
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* Check if string is HTML
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*/
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var isHtml = function(str) {
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// Faster than running regex, if str starts with `<` and ends with `>`, assume it's HTML
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if (str.charAt(0) === '<' && str.charAt(str.length - 1) === '>' && str.length >= 3) return true;
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// Run the regex
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var match = quickExpr.exec(str);
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return !!(match && match[1]);
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};
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/*
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* Make a cheerio object
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*/
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Cheerio.prototype.make = function(dom, context) {
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if (dom.cheerio) return dom;
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dom = (Array.isArray(dom)) ? dom : [dom];
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return _.extend(context || new Cheerio(), dom, { length: dom.length });
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};
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/**
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* Turn a cheerio object into an array
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*/
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Cheerio.prototype.toArray = function() {
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return [].slice.call(this, 0);
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};
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/**
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* Plug in the API
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*/
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api.forEach(function(mod) {
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_.extend(Cheerio.prototype, require('./api/' + mod));
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});
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