Created
May 3, 2016 09:02
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| var cheerio = require('cheerio'); | |
| var Crawler = require('simplecrawler'); | |
| var initialTopic = 'SpaceX'; | |
| var blacklist = ["#", "/w/", "/static/", "/api/", "/beacon/", "File:", | |
| "Wikipedia:", "Template:", "MediaWiki:", "Help:", "Special:", | |
| "Category:", "Portal:", "Main_Page", "Talk:", "User:", | |
| "User_talk:", "Template_talk:", "Module:"]; //useless special cases from wikipedia | |
| var url = '/wiki/' + initialTopic; | |
| var crawler = new Crawler('en.wikipedia.org', url, 80); | |
| crawler.initialProtocol = 'https'; | |
| crawler.maxDepth = 2; //reads only main article and links off of that | |
| crawler.scanSubdomains = false; | |
| crawler.stripWWWDomain = true; | |
| crawler.stripQuerystring = true; | |
| crawler.addFetchCondition(function(parsedURL, queueItem) { | |
| return parsedURL.depth <= crawler.maxDepth; | |
| }); | |
| crawler.discoverResources = function(buffer, queueItem) { | |
| var $ = cheerio.load(buffer.toString("utf8")); | |
| $('.div-col.columns.column-count.column-count-2').prev().nextAll().remove(); //this removes the reference section after the main article | |
| var resources = $('a[href]').map(function() { | |
| var link = $(this).attr('href'); | |
| if (!new RegExp(blacklist.join("|")).test(link)) { //this prevents the crawler from crawling irrelevant/useless pages | |
| return link; | |
| } | |
| }).get(); | |
| return crawler.cleanExpandResources(resources, queueItem); | |
| }; | |
| crawler.on("fetchcomplete", function(queueItem, responseBuffer, response) { | |
| var fetchedAddress = queueItem.url; | |
| var $ = cheerio.load(responseBuffer.toString("utf8")); | |
| $('.div-col.columns.column-count.column-count-2').nextAll().remove(); //removes reference section from article for ease of reading | |
| var cleanedData = $('#mw-content-text').text() //assigning body of article to variable for testing/logging | |
| console.log(fetchedAddress); //logs the link of article that it is currently crawling | |
| articles.push(cleanedData); | |
| }); | |
| crawler.on("crawlstart", function() { | |
| console.log("begin!"); | |
| var articles = []; | |
| }); | |
| crawler.on("complete", function() { //this event does not fire and the console hangs | |
| console.log("end!"); | |
| console.log(articles.length); | |
| }); | |
| crawler.start(); //start crawler |
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