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scrapinode.js
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scrapinode.js
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/*!
* scrapinode
* Copyright(c) 2013 Rémy Loubradou
* Author Rémy Loubradou <remyloubradou@gmail.com>
* MIT Licensed
*/
/**
* Modules dependencies
*/
var browser = require('./browser'),
Router = require('./router'),
Route = require('./route'),
Scraper = require('./scraper'),
defaults = require('./defaults/');
/**
* Expose an instance of `Scrapinode`
* as a convenience mostly
*/
module.exports = new Scrapinode();
/**
* Create an instance of ̀Scrapinode`
*
* @return {Scrapinode}
* @api public
*/
exports.createInstance = function(engine){
return new Scrapinode(engine);
};
/**
* `Scrapinode` class
*
* @constructor
* @api private
*/
function Scrapinode(engine){
this.engine = engine || 'jsdom';
this.router = new Router();
};
/**
* Create a scraper for the given `url` with the given `engine`
*
* @param {String|Object} options - url of the page or a set of options in this case options.url is mandatory
* @param {String} options.url - url of the page
* @param {String} [engine='this.engine'] - name of the engine (jsdom or cheerio)
* @param {String} [html=undefined] - HTML content
* @param {Function} callback -
* @param {Error} callback().err -
* @param {Scraper} callback().scraper -
*
* @api public
*/
Scrapinode.prototype.createScraper = function (options,callback){
var self = this;
if(typeof(options) === 'string'){
var url = options;
options = {
url : url,
engine : this.engine
};
}
if(!options.engine) options.engine = this.engine;
browser.load(options,function(err,window){
if(err) return callback(err);
var scraper = new Scraper(options.url,window,self.router);
callback(err,scraper);
});
};
/**
* Add the given `operation` in the router for the given `path` and `content`
*
* @param {String|RegExp} path -
* @param {String|RegExp} content -
* @param {Function} operation -
*
* @return {this}
* @api public
*/
Scrapinode.prototype.use = function(path,content,operation){
this.router.addRoute(new Route(path,content,operation));
return this;
};
/**
* Add all given `routes` caracterized by a `path`, a `content` and an `operation` in the `router`
*
* @param {Array} routes -
* @param {String|RegExp} routes[].path -
* @param {String|RegExp} routes[].content -
* @param {Function} routes[].operation -
*
* @return {this}
* @api public
*/
Scrapinode.prototype.useAll = function(routes){
var self = this;
routes.forEach(function(route){
self.router.addRoute(new Route(route.path,route.content,route.operation));
});
return self;
};
/**
* Remove all the routes available in the router
*
* @return
* @api public
*/
Scrapinode.prototype.clearRouter = function(){
this.router.routes = [];
return this;
};
/**
* Expose default routes for the contents "title", "descriptions", "videos", "images"
*
* @return {Array} routes
* @api public
*/
Scrapinode.prototype.defaults = function(){
return defaults;
};