Class: Chemicals::Renderer

Inherits:
Object
  • Object
show all
Defined in:
lib/chemicals/renderer.rb

Instance Method Summary collapse

Constructor Details

#initialize(template) ⇒ Renderer

Returns a new instance of Renderer.



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# File 'lib/chemicals/renderer.rb', line 4

def initialize template
  @template = template
end

Instance Method Details

#render(source) ⇒ Object 



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# File 'lib/chemicals/renderer.rb', line 8

def render source
  # begin with a new document
  document = Nokogiri::XML::Document.new
  # add a temp node as a namespace referebce
  document.root = Nokogiri::XML::Element.new 'temp', document
  @template.add_namespaces document.root
  # now render the entire document as the new root
  document.root = render_node document, source, @template.raw.root
  # again add all required namespaces to the real root
  @template.add_namespaces document.root
  # return the root
  document.root
end

#render_node(document, source, template, collect = true) ⇒ Object 



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# File 'lib/chemicals/renderer.rb', line 22

def render_node document, source, template, collect = true
  # the template is already the template to apply this source on
  # do nothing if there's no source
  return nil unless source && config = @template.for(template.path)
  # don't render the chemicals namespace
  return nil if template.namespace && template.namespace.href == 'http://piesync.com/xml/chemicals'
  # unwrap if necessary
  source = source[config[:as].to_sym] if config.has_key?(:as) && !config[:as].nil? && collect
  # is this a collect node? Rendering a collect node is the same as rendering the
  # template for each part of the source (and render them as a non-collect node)
  # The result are the rendered nodes.
  if collect && config[:mode] == :collect
    return source.map { |part| render_node document, part, template, false } if source
  end
  # render all children
  rendered = (template.children.to_a + template.attribute_nodes).map do |child|
    render_node document, source, child, true if source
  end.flatten
  # reject all nil values
  rendered.reject! { |value| !value }
  # we again have a few cases how to render
  case template
  when Nokogiri::XML::Attr
    return unless source
    node = Nokogiri::XML::Attr.new document, template.name
    node.content = source
  when Nokogiri::XML::Text
    node = Nokogiri::XML::Text.new source, document if source
  when Nokogiri::XML::Element
    # don't render an element if it has no data in its children
    return unless !rendered.empty?
    node = Nokogiri::XML::Element.new template.name, document
    rendered.each do |child|
      # manually add attributes cause otherwise resulting in a segfault
      if child.kind_of? Nokogiri::XML::Attr
        node.set_attribute child.name, child.value
        node.attribute(child.name).namespace = child.namespace
      # add the non-attibutes
      else
        node.add_child child
      end
    end
  end
  # Add the correct namespaces!
  node.namespace = document.root.namespace_definitions.find { |ns|
    ns.href == template.namespace.href
  } if node && !template.namespace.nil?
  node
end