Method: ContentFocus::HTML#static_fragments

Defined in:
lib/content_focus/html.rb

#static_fragments(options = {}) ⇒ Object

Get all relevant div/span/td/body/p blocks from the HTML page - based on the <title> This is to extract atomic/permanent content



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# File 'lib/content_focus/html.rb', line 73

def static_fragments(options = {})
  title_elements = (@doc/"title")
  return html if !title_elements || title_elements.empty?
  title_inner_text = title_elements.first.inner_text
  keywords = Linguistics::Tagger.keywords_for_caption(title_inner_text)
  blocks = []

  # First, find the smallest blocks, but bigger than the title
  (@doc/"div|span|td|body|p|dd|ul").each do |element|
  
    next if element_with_negative_identifier(element)
  
    inner_text = ''
    element.children.each do |child|
      inner_text << child.to_s if child.is_a?(Hpricot::Text)
    end
    inner_text.downcase!
    next if inner_text.size <= title_inner_text.size
  
    # Check the occurance of keyword in block, skip if none
    num_matches = 0
    keywords.each { |k| num_matches+=1 if inner_text.split(/\s+/).include?(k) }
    next if num_matches == 0
  
    # Calculate a score based on keyword matches times positive naming of id/class
    score = num_matches
    identifier = nil
    if (identifier = element_with_positive_identifier(element))
      score = score * 2;
    end
  
    blocks << {:score => score, :element => element, :inner_text => inner_text, :parent => element.parent ? element.parent.object_id : nil, :identifier => identifier}
  end

  big_block_identifiers = {}

  # Finding big blocks with both matches and positive identifiers
  (@doc/"div|span|table|td|body|p|dd|ul").each do |element|
  
    next if element_with_negative_identifier(element)
  
    # Need to log identifier statistics
    identifier = nil
    if (identifier = element_with_positive_identifier(element))
      big_block_identifiers[identifier] ||= 0
      big_block_identifiers[identifier] += 1
    else
      next
    end
  
    inner_text = element.inner_text
    inner_text.downcase!
    next if inner_text.size <= title_inner_text.size
  
    # Check the occurance of keyword in block, skip if none
    num_matches = 0
    keywords.each { |k| num_matches+=1 if inner_text.split(/\s+/).include?(k) }
  
    #puts "#{element.name}(#{element.inner_text.size}/#{title_inner_text.size}, score:#{num_matches} * #{element_with_positive_identifier(element)}): " + element.attributes['class'].to_s
  
    next if num_matches == 0
  
    # Calculate a score based on keyword matches times positive naming of id/class
    score = num_matches
    if identifier
      score = score * 3;
    end
  
    blocks << {:score => score, :element => element, :inner_text => inner_text, :parent => element.parent ? element.parent : nil, :identifier => identifier}
  end

  # De-value the identifiers that are repeated
  blocks.each do |block|
    if block[:identifier] && big_block_identifiers[block[:identifier]].to_i > 1
      block[:score] = block[:score] / 3;
    end
  end

  # Order those blocks by top matches
  blocks.sort! { |b,a| a[:score] <=> b[:score] }
  blocks.reject! { |b| b[:score] == 0 }
  blocks
end