Module: Kiosk::ContentTeaser

Included in:
WordPress::Post
Defined in:
lib/kiosk/content_teaser.rb

Instance Method Summary collapse

Instance Method Details

#teaser(horizon, options = {}) ⇒ Object

Returns a teaser of the content with roughly the given length.

The content is parsed as an HTML fragment and only text nodes are considered to have length in this context. As a result, the returned string will not have a length matching the given horizon exactly, but should render as such.



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# File 'lib/kiosk/content_teaser.rb', line 12

def teaser(horizon, options = {})
  if doc = content_document

    # Traverse all text nodes until we reach the limit
    length = 0

    # Find the boundary node, where the text length crosses the horizon
    node = doc.xpath('descendant::text()').detect do |n|
      (length += n.content.length) >= horizon
    end

    if node
      # Truncate the content of the boundary text node
      node.content = node.content.truncate(node.content.length - (length - horizon), options)

      # Remove all following nodes from the document
      # Note that this mark-and-sweep method is due to the catch 22 of
      # relative DOM traversal (next, parent, etc.) and node removal.
      nodes_to_remove = []
      nodes_to_remove << node while node = (node.next || (node.parent && node.parent.next))
      nodes_to_remove.each { |n| n.remove if n.parent }
    end

    doc.to_html
  else
    ""
  end
end