Module: EffectiveTruncateHtmlHelper

Defined in:
app/helpers/effective_truncate_html_helper.rb

Instance Method Summary collapse

Instance Method Details

#_truncate_node_to_content(node, content, omission, seen = false) ⇒ Object 



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# File 'app/helpers/effective_truncate_html_helper.rb', line 19

def _truncate_node_to_content(node, content, omission, seen = false)
  if seen == true
    node.remove
  elsif node.children.blank?
    index = node.content.index(content)

    if index.present?
      if node.parent.try(:content) == content # If my parent node just has my text in it, remove parent node too
        node.parent.remove
      elsif index == 0
        node.remove
      else
        node.content = truncate(node.content, length: index+omission.to_s.length, separator: ' ', omission: omission)
      end

      seen = true
    end
  else
    node.children.each { |child| seen = _truncate_node_to_content(child, content, omission, seen) }
  end

  seen
end

#_truncate_node_to_length(node, length, omission) ⇒ Object 



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# File 'app/helpers/effective_truncate_html_helper.rb', line 44

def _truncate_node_to_length(node, length, omission)
  if node.inner_text.length <= length
    # Do nothing, we're already reached base case
  elsif node.name == 'a'
    node.remove # I don't want to truncate anything in a link
  elsif node.children.blank?
    # I need to truncate myself, and I'm certainly a text node
    if node.text?
      node.content = truncate(node.content, length: length+omission.to_s.length, separator: ' ', omission: omission)
    else
      node.remove
    end
  else # Go through all the children, and delete anything after the length has been reached
    child_length = 0

    node.children.each do |child|
      child_length > length ? (child.remove) : (child_length += child.inner_text.length)
    end

    # We have now removed all nodes after length, but the last node is longer than our length
    # child_length is the inner_text length of all included nodes
    # And we only have to truncate the last child to get under length

    child = node.children.last
    child_max_length = length - (child_length - child.inner_text.length)

    _truncate_node_to_length(child, child_max_length, omission)
  end
end

#truncate_html(text, length_or_content = 200, omission = '...') ⇒ Object

Truncates HTML or text to a certain inner_text character limit.

If given HTML, the underlying markup may be much longer than length, but the displayed text will be no longer than (length + omission) characters.



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# File 'app/helpers/effective_truncate_html_helper.rb', line 6

def truncate_html(text, length_or_content = 200, omission = '...')
  doc = Nokogiri::HTML::DocumentFragment.parse(text)

  if length_or_content.kind_of?(String)
    content = (Nokogiri::HTML::DocumentFragment.parse(length_or_content).children.first.inner_text rescue length_or_content)
    doc.tap { |doc| _truncate_node_to_content(doc, content, omission) }.inner_html
  elsif length_or_content.kind_of?(Integer)
    doc.tap { |doc| _truncate_node_to_length(doc, length_or_content, omission) }.inner_html
  else
    raise 'Unsupported datatype passed to second argument of truncate_html.  Expecting integer or string.'
  end
end