Class: DQReadability::Document
- Inherits:
-
Object
- Object
- DQReadability::Document
- Defined in:
- lib/dq-readability.rb
Constant Summary collapse
- DEFAULT_OPTIONS =
{ :retry_length => 250, :min_text_length => 25, :remove_unlikely_candidates => true, :weight_classes => true, :clean_conditionally => true, :remove_empty_nodes => true, :min_image_width => 130, :min_image_height => 80, :ignore_image_format => [], :bypass => false, :math => false }.freeze
- REGEXES =
{ :unlikelyCandidatesRe => /combx|comment|community|disqus|extra|foot|header|menu|remark|rss|shoutbox|sidebar|sponsor|ad-break|agegate|pagination|pager|popup/i, :okMaybeItsACandidateRe => /and|article|body|column|main|shadow/i, :positiveRe => /article|body|content|entry|hentry|main|page|pagination|post|text|blog|story/i, :negativeRe => /combx|comment|com-|contact|foot|footer|footnote|masthead|media|meta|outbrain|promo|related|scroll|shoutbox|sidebar|sponsor|shopping|tags|tool|widget/i, :divToPElementsRe => /<(a|blockquote|dl|div|img|ol|p|pre|table|ul)/i, :replaceBrsRe => /(<br[^>]*>[ \n\r\t]*){2,}/i, :replaceFontsRe => /<(\/?)font[^>]*>/i, :trimRe => /^\s+|\s+$/, :normalizeRe => /\s{2,}/, :killBreaksRe => /(<br\s*\/?>(\s| ?)*){1,}/, :videoRe => /http:\/\/(www\.)?(youtube|vimeo)\.com/i }
Instance Attribute Summary collapse
-
#best_candidate ⇒ Object
Returns the value of attribute best_candidate.
-
#best_candidate_has_image ⇒ Object
Returns the value of attribute best_candidate_has_image.
-
#candidates ⇒ Object
Returns the value of attribute candidates.
-
#html ⇒ Object
Returns the value of attribute html.
-
#options ⇒ Object
Returns the value of attribute options.
Instance Method Summary collapse
-
#author ⇒ Object
Look through the @html document looking for the author Precedence Information here on the wiki: (TODO attach wiki URL if it is accepted) Returns nil if no author is detected.
- #class_weight(e) ⇒ Object
- #clean_conditionally(node, candidates, selector) ⇒ Object
- #content(remove_unlikely_candidates = :default) ⇒ Object
- #debug(str) ⇒ Object
- #get_article(candidates, best_candidate) ⇒ Object
- #get_image_size(url) ⇒ Object
- #get_link_density(elem) ⇒ Object
- #image_meets_criteria?(image) ⇒ Boolean
- #images(content = nil, reload = false) ⇒ Object
- #images_with_fqdn_uris(document = @html.dup, source_uri) ⇒ Object
- #images_with_fqdn_uris!(source_uri) ⇒ Object
-
#initialize(input, options = {}) ⇒ Document
constructor
A new instance of Document.
- #make_html ⇒ Object
- #prepare_candidates ⇒ Object
- #remove_unlikely_candidates! ⇒ Object
- #sanitize(node, candidates, options = {}) ⇒ Object
- #score_node(elem) ⇒ Object
- #score_paragraphs(min_text_length) ⇒ Object
- #select_best_candidate(candidates) ⇒ Object
- #title ⇒ Object
- #transform_misused_divs_into_paragraphs! ⇒ Object
Constructor Details
#initialize(input, options = {}) ⇒ Document
Returns a new instance of Document.
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# File 'lib/dq-readability.rb', line 41 def initialize(input, = {}) @options = DEFAULT_OPTIONS.merge() @input = open(input).read @url = input if RUBY_VERSION =~ /^(1\.9|2)/ && !@options[:encoding] @input = GuessHtmlEncoding.encode(@input, @options[:html_headers]) unless @options[:do_not_guess_encoding] @options[:encoding] = @input.encoding.to_s end @input = @input.gsub(REGEXES[:replaceBrsRe], '</p><p>').gsub(REGEXES[:replaceFontsRe], '<\1span>') @remove_unlikely_candidates = @options[:remove_unlikely_candidates] @weight_classes = @options[:weight_classes] @clean_conditionally = @options[:clean_conditionally] @best_candidate_has_image = true @bypass = @options[:bypass] @math = @options[:math] make_html end |
Instance Attribute Details
#best_candidate ⇒ Object
Returns the value of attribute best_candidate.
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# File 'lib/dq-readability.rb', line 39 def best_candidate @best_candidate end |
#best_candidate_has_image ⇒ Object
Returns the value of attribute best_candidate_has_image.
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# File 'lib/dq-readability.rb', line 39 def best_candidate_has_image @best_candidate_has_image end |
#candidates ⇒ Object
Returns the value of attribute candidates.
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# File 'lib/dq-readability.rb', line 39 def candidates @candidates end |
#html ⇒ Object
Returns the value of attribute html.
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# File 'lib/dq-readability.rb', line 39 def html @html end |
#options ⇒ Object
Returns the value of attribute options.
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# File 'lib/dq-readability.rb', line 39 def @options end |
Instance Method Details
#author ⇒ Object
Look through the @html document looking for the author Precedence Information here on the wiki: (TODO attach wiki URL if it is accepted) Returns nil if no author is detected
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# File 'lib/dq-readability.rb', line 262 def # Let's grab this author: # <meta name="dc.creator" content="Finch - http://www.getfinch.com" /> = @html.xpath('//meta[@name = "dc.creator"]') unless .empty? .each do |element| if element['content'] return element['content'].strip end end end # Now let's try to grab this # <span class="byline author vcard"><span>By</span><cite class="fn">Austin Fonacier</cite></span> # <div class="author">By</div><div class="author vcard"><a class="url fn" href="http://austinlivesinyoapp.com/">Austin Fonacier</a></div> = @html.xpath('//*[contains(@class, "vcard")]//*[contains(@class, "fn")]') unless .empty? .each do |element| if element.text return element.text.strip end end end # Now let's try to grab this # <a rel="author" href="http://dbanksdesign.com">Danny Banks (rel)</a> # TODO: strip out the (rel)? = @html.xpath('//a[@rel = "author"]') unless .empty? .each do |element| if element.text return element.text.strip end end end = @html.xpath('//*[@id = "author"]') unless .empty? .each do |element| if element.text return element.text.strip end end end end |
#class_weight(e) ⇒ Object
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# File 'lib/dq-readability.rb', line 425 def class_weight(e) weight = 0 return weight unless @weight_classes if e[:class] && e[:class] != "" if e[:class] =~ REGEXES[:negativeRe] weight -= 25 end if e[:class] =~ REGEXES[:positiveRe] weight += 25 end end if e[:id] && e[:id] != "" if e[:id] =~ REGEXES[:negativeRe] weight -= 25 end if e[:id] =~ REGEXES[:positiveRe] weight += 25 end end weight end |
#clean_conditionally(node, candidates, selector) ⇒ Object
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# File 'lib/dq-readability.rb', line 584 def clean_conditionally(node, candidates, selector) return unless @clean_conditionally node.css(selector).each do |el| weight = class_weight(el) content_score = candidates[el] ? candidates[el][:content_score] : 0 name = el.name.downcase if weight + content_score < 0 el.remove debug("Conditionally cleaned #{name}##{el[:id]}.#{el[:class]} with weight #{weight} and content score #{content_score} because score + content score was less than zero.") elsif el.text.count(",") < 10 counts = %w[p img li a embed input].inject({}) { |m, kind| m[kind] = el.css(kind).length; m } counts["li"] -= 100 # For every img under a noscript tag discount one from the count to avoid double counting counts["img"] -= el.css("noscript").css("img").length content_length = el.text.strip.length # Count the text length excluding any surrounding whitespace link_density = get_link_density(el) to_remove = false reason = "" if (counts["img"] > counts["p"]+2) reason = "too many images" to_remove = true elsif counts["li"] > counts["p"] && name != "ul" && name != "ol" reason = "more <li>s than <p>s" to_remove = true elsif counts["input"] > (counts["p"] / 3).to_i reason = "less than 3x <p>s than <input>s" to_remove = true elsif (content_length < [:min_text_length]) && (counts["img"] != 1) reason = "too short a content length without a single image" to_remove = true elsif weight < 25 && link_density > 0.2 reason = "too many links for its weight (#{weight})" to_remove = true elsif weight >= 25 && link_density > 0.5 reason = "too many links for its weight (#{weight})" to_remove = true elsif (counts["embed"] == 1 && content_length < 75) || counts["embed"] > 1 reason = "<embed>s with too short a content length, or too many <embed>s" to_remove = true end if to_remove debug("Conditionally cleaned #{name}##{el[:id]}.#{el[:class]} with weight #{weight} and content score #{content_score} because it has #{reason}.") el.remove end end end end |
#content(remove_unlikely_candidates = :default) ⇒ Object
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# File 'lib/dq-readability.rb', line 308 def content(remove_unlikely_candidates = :default) if @bypass == false @remove_unlikely_candidates = false if remove_unlikely_candidates == false prepare_candidates article = get_article(@candidates, @best_candidate) cleaned_article = sanitize(article, @candidates, ) if article.text.strip.length < [:retry_length] if @remove_unlikely_candidates @remove_unlikely_candidates = false elsif @weight_classes @weight_classes = false elsif @clean_conditionally @clean_conditionally = false else # nothing we can do return cleaned_article end make_html content else cleaned_article end else make_html s = Nokogiri::XML::Node::SaveOptions save_opts = s::NO_DECLARATION | s::NO_EMPTY_TAGS | s::AS_XHTML html = @html.serialize(:save_with => save_opts) return html end end |
#debug(str) ⇒ Object
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# File 'lib/dq-readability.rb', line 467 def debug(str) puts str if [:debug] end |
#get_article(candidates, best_candidate) ⇒ Object
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# File 'lib/dq-readability.rb', line 342 def get_article(candidates, best_candidate) # Now that we have the top candidate, look through its siblings for content that might also be related. # Things like preambles, content split by ads that we removed, etc. sibling_score_threshold = [10, best_candidate[:content_score] * 0.2].max output = Nokogiri::XML::Node.new('div', @html) best_candidate[:elem].parent.children.each do |sibling| append = false append = true if sibling == best_candidate[:elem] append = true if candidates[sibling] && candidates[sibling][:content_score] >= sibling_score_threshold if sibling.name.downcase == "p" link_density = get_link_density(sibling) node_content = sibling.text node_length = node_content.length if node_length > 80 && link_density < 0.25 append = true elsif node_length < 80 && link_density == 0 && node_content =~ /\.( |$)/ append = true end end if append sibling_dup = sibling.dup # otherwise the state of the document in processing will change, thus creating side effects sibling_dup.name = "div" unless %w[div p].include?(sibling.name.downcase) output << sibling_dup end end output end |
#get_image_size(url) ⇒ Object
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# File 'lib/dq-readability.rb', line 238 def get_image_size(url) begin w, h = FastImage.size(url) raise "Couldn't get size." if w.nil? || h.nil? {:width => w, :height => h} rescue => e debug("Image error: #{e}") nil end end |
#get_link_density(elem) ⇒ Object
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# File 'lib/dq-readability.rb', line 389 def get_link_density(elem) link_length = elem.css("a").map(&:text).join("").length text_length = elem.text.length link_length / text_length.to_f end |
#image_meets_criteria?(image) ⇒ Boolean
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# File 'lib/dq-readability.rb', line 249 def image_meets_criteria?(image) return false if [:ignore_image_format].include?(image[:format].downcase) image[:width] >= ([:min_image_width] || 0) && image[:height] >= ([:min_image_height] || 0) end |
#images(content = nil, reload = false) ⇒ Object
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# File 'lib/dq-readability.rb', line 164 def images(content=nil, reload=false) begin require 'fastimage' rescue LoadError raise "Please install fastimage in order to use the #images feature." end @best_candidate_has_image = false if reload prepare_candidates list_images = [] tested_images = [] content = @best_candidate[:elem] unless reload return list_images if content.nil? elements = content.css("img").map(&:attributes) elements.each do |element| next unless element["src"] url = element["src"].value height = element["height"].nil? ? 0 : element["height"].value.to_i width = element["width"].nil? ? 0 : element["width"].value.to_i if url =~ /\Ahttps?:\/\//i && (height.zero? || width.zero?) image = get_image_size(url) next unless image else image = {:width => width, :height => height} end image[:format] = File.extname(url).gsub(".", "") if tested_images.include?(url) debug("Image was tested: #{url}") next end tested_images.push(url) if image_meets_criteria?(image) list_images << url else debug("Image discarded: #{url} - height: #{image[:height]} - width: #{image[:width]} - format: #{image[:format]}") end end (list_images.empty? and content != @html) ? images(@html, true) : list_images end |
#images_with_fqdn_uris(document = @html.dup, source_uri) ⇒ Object
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# File 'lib/dq-readability.rb', line 217 def images_with_fqdn_uris(document = @html.dup, source_uri) uri = URI.parse(source_uri) host = uri.host scheme = uri.scheme port = uri.port # defaults to 80 base = "#{scheme}://#{host}:#{port}/" images = [] document.css("img").each do |elem| begin elem['src'] = URI.join(base,elem['src']).to_s if URI.parse(elem['src']).host == nil images << elem['src'].to_s rescue URI::InvalidURIError => exc elem.remove end end images(document,true) end |
#images_with_fqdn_uris!(source_uri) ⇒ Object
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# File 'lib/dq-readability.rb', line 213 def images_with_fqdn_uris!(source_uri) images_with_fqdn_uris(@html, source_uri) end |
#make_html ⇒ Object
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# File 'lib/dq-readability.rb', line 70 def make_html @html = Nokogiri::HTML(@input, nil, @options[:encoding]) # In case document has no body, such as from empty string or redirect @html = Nokogiri::HTML('<body />', nil, @options[:encoding]) if @html.css('body').length == 0 # Remove html comment tags @html.xpath('//comment()').each { |i| i.remove } # making all the headings of same format @html.css("h1").each do |h| h.name = "h2" end @html.css("h2").each do |h| h.name = "h3" end @html.css("h4").each do |h| h.name = "h3" end uri = URI.parse(@url) host = uri.host scheme = uri.scheme port = uri.port # defaults to 80 base = "#{scheme}://#{host}:#{port}/" # changing img src @html.css("img").each do |elem| begin if elem['src'][0] == '/' if elem['src'][1] == '/' elem['src'] = 'http:'+elem['src'] else elem['src'] = URI.join(base,elem['src']).to_s if URI.parse(elem['src']).host == nil end else if @url.split('').last == '/' elem['src'] = URI.join(@url,elem['src']).to_s if URI.parse(elem['src']).host == nil else x = @url.split('/') x.delete_at(x.length-1) y = '' x.each{|i| y += i+'/'} elem['src'] = URI.join(y,elem['src']).to_s if URI.parse(elem['src']).host == nil end end rescue elem.remove end end # changing certain tags to <p> tags x = @html.css("ol") x.each do |t| t.name = "p" end len = @html.css('ol').length debug("length of ol tag #{len}") #changing the 'a' href @html.css("a").each do |elem| begin if elem['href'][0] == '/' elem['href'] = URI.join(base,elem['href']).to_s if URI.parse(elem['href']).host == nil else if @url.split('').last == '/' elem['href'] = URI.join(@url,elem['href']).to_s if URI.parse(elem['href']).host == nil else x = @url.split('/') x.delete_at(x.length-1) y = '' x.each{|i| y += i+'/'} elem['href'] = URI.join(y,elem['href']).to_s if URI.parse(elem['href']).host == nil end end rescue end end # removing edit spans @html.css('span').each do |elem| if elem.text.downcase == "[edit]" elem.remove end end end |
#prepare_candidates ⇒ Object
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# File 'lib/dq-readability.rb', line 61 def prepare_candidates @html.css("script, style").each { |i| i.remove } remove_unlikely_candidates! if @remove_unlikely_candidates transform_misused_divs_into_paragraphs! @candidates = score_paragraphs([:min_text_length]) @best_candidate = select_best_candidate(@candidates) end |
#remove_unlikely_candidates! ⇒ Object
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# File 'lib/dq-readability.rb', line 471 def remove_unlikely_candidates! @html.css("*").each do |elem| str = "#{elem[:class]}#{elem[:id]}" if str =~ REGEXES[:unlikelyCandidatesRe] && str !~ REGEXES[:okMaybeItsACandidateRe] && (elem.name.downcase != 'html') && (elem.name.downcase != 'body') debug("Removing unlikely candidate - #{str}") elem.remove end end end |
#sanitize(node, candidates, options = {}) ⇒ Object
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# File 'lib/dq-readability.rb', line 501 def sanitize(node, candidates, = {}) node.css("h1, h2, h3, h4, h5, h6").each do |header| header.remove if class_weight(header) < 0 || get_link_density(header) > 0.33 end node.css("form, object, iframe, embed").each do |elem| elem.remove end # if @options[:remove_empty_nodes] # # remove <p> tags that have no text content - this will also remove p tags that contain only images. # node.css("p").each do |elem| # elem.remove if elem.content.strip.empty? # end # end # Conditionally clean <table>s, <ul>s, and <div>s clean_conditionally(node, candidates, "table, ul, div") # We'll sanitize all elements using a whitelist base_whitelist = @options[:tags] || %w[div p] # We'll add whitespace instead of block elements, # so a<br>b will have a nice space between them base_replace_with_whitespace = %w[br hr h1 h2 h3 h4 h5 h6 dl dd ol li ul address blockquote center] # Use a hash for speed (don't want to make a million calls to include?) whitelist = Hash.new base_whitelist.each {|tag| whitelist[tag] = true } replace_with_whitespace = Hash.new base_replace_with_whitespace.each { |tag| replace_with_whitespace[tag] = true } ([node] + node.css("*")).each do |el| # If element is in whitelist, delete all its attributes if whitelist[el.node_name] el.attributes.each { |a, x| el.delete(a) unless @options[:attributes] && @options[:attributes].include?(a.to_s) } # Otherwise, replace the element with its contents else # If element is root, replace the node as a text node if el.parent.nil? node = Nokogiri::XML::Text.new(el.text, el.document) break else if replace_with_whitespace[el.node_name] el.swap(Nokogiri::XML::Text.new(' ' << el.text << ' ', el.document)) else el.swap(Nokogiri::XML::Text.new(el.text, el.document)) end end end end s = Nokogiri::XML::Node::SaveOptions save_opts = s::NO_DECLARATION | s::NO_EMPTY_TAGS | s::AS_XHTML html = node.serialize(:save_with => save_opts) # Get rid of duplicate whitespace if @math == false html = "<head><meta http-equiv='Content-Type' content='text/html; charset=utf-8'></head>" + "\n" + html.gsub(/[\r\n\f]+/, "\n" ) else head = <<HTML <head><meta http-equiv='Content-Type' content='text/html; charset=utf-8'> <script type='text/x-mathjax-config'> MathJax.Hub.Config({tex2jax: {inlineMath: [['$','$'], ['\\\\(','\\\\)']]}}); </script> <script type='text/javascript' src='http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML'> </script> </head> HTML html = head + "\n" + html.gsub(/[\r\n\f]+/, "\n" ) end # get rid of incompitable characters if html.encode('utf-8').include?('Â') html = html.encode('utf-8').gsub('Â',' ') end return html end |
#score_node(elem) ⇒ Object
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# File 'lib/dq-readability.rb', line 452 def score_node(elem) content_score = class_weight(elem) case elem.name.downcase when "div" content_score += 5 when "blockquote" content_score += 3 when "form" content_score -= 3 when "th" content_score -= 5 end { :content_score => content_score, :elem => elem } end |
#score_paragraphs(min_text_length) ⇒ Object
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# File 'lib/dq-readability.rb', line 395 def score_paragraphs(min_text_length) candidates = {} @html.css("p,td").each do |elem| parent_node = elem.parent grand_parent_node = parent_node.respond_to?(:parent) ? parent_node.parent : nil inner_text = elem.text # If this paragraph is less than 25 characters, don't even count it. next if inner_text.length < min_text_length candidates[parent_node] ||= score_node(parent_node) candidates[grand_parent_node] ||= score_node(grand_parent_node) if grand_parent_node content_score = 1 content_score += inner_text.split(',').length content_score += [(inner_text.length / 100).to_i, 3].min candidates[parent_node][:content_score] += content_score candidates[grand_parent_node][:content_score] += content_score / 2.0 if grand_parent_node end # Scale the final candidates score based on link density. Good content should have a # relatively small link density (5% or less) and be mostly unaffected by this operation. candidates.each do |elem, candidate| candidate[:content_score] = candidate[:content_score] * (1 - get_link_density(elem)) end candidates end |
#select_best_candidate(candidates) ⇒ Object
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# File 'lib/dq-readability.rb', line 375 def select_best_candidate(candidates) sorted_candidates = candidates.values.sort { |a, b| b[:content_score] <=> a[:content_score] } debug("Top 5 candidates:") sorted_candidates[0...5].each do |candidate| debug("Candidate #{candidate[:elem].name}##{candidate[:elem][:id]}.#{candidate[:elem][:class]} with score #{candidate[:content_score]}") end best_candidate = sorted_candidates.first || { :elem => @html.css("body").first, :content_score => 0 } debug("Best candidate #{best_candidate[:elem].name}##{best_candidate[:elem][:id]}.#{best_candidate[:elem][:class]} with score #{best_candidate[:content_score]}") best_candidate end |
#title ⇒ Object
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# File 'lib/dq-readability.rb', line 254 def title title = @html.css("title").first title ? title.text : nil end |
#transform_misused_divs_into_paragraphs! ⇒ Object
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# File 'lib/dq-readability.rb', line 481 def transform_misused_divs_into_paragraphs! @html.css("*").each do |elem| if elem.name.downcase == "div" # transform <div>s that do not contain other block elements into <p>s if elem.inner_html !~ REGEXES[:divToPElementsRe] debug("Altering div(##{elem[:id]}.#{elem[:class]}) to p"); elem.name = "p" end else # wrap text nodes in p tags # elem.children.each do |child| # if child.text? # debug("wrapping text node with a p") # child.swap("<p>#{child.text}</p>") # end # end end end end |