Created
August 2, 2012 18:38
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| # http://pad.squareup.com/457865 | |
| # Jico Baligod | |
| # curl "http://pad.squareup.com/ep/pad/export/457865/latest?format=txt" > crawler.rb; ruby crawler.rb | |
| # <a href='http://www.rubyinside.com/feed/'>RSS feed</a> | |
| require 'net/http' | |
| require 'uri' | |
| class Crawler | |
| attr_reader :url_list | |
| def initialize | |
| @url_list = [] | |
| end | |
| def crawl(url) | |
| urls = extract_urls(url) | |
| queue = urls | |
| while !queue.empty? | |
| children = extract_urls(queue.shift) | |
| children.each { |u| queue.push(u) unless queue.include? u } | |
| queue.each { |u| @url_list << u unless @url_list.include? u } | |
| break if @url_list.count >= 500 | |
| end | |
| end | |
| def extract_urls(url) | |
| uri = URI.parse(url) | |
| response = Net::HTTP.get_response(uri) | |
| matches = response.body.scan(/<a .*href=["'](http[^s].*?)["']/) | |
| return matches.flatten | |
| end | |
| end | |
| crawler = Crawler.new | |
| crawler.crawl('http://www.yahoo.com') | |
| puts crawler.url_list | |
| # a = [] | |
| # puts 'hello' if a |
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