Class: Utopia::Middleware::Content::Transaction

Inherits:
Object
  • Object
show all
Defined in:
lib/utopia/middleware/content/node.rb

Overview

Nodes typically represent XNODE files on the disk. You can get a list of Links from a current directory. This comprises of all files ending in “.xnode”.

Defined Under Namespace

Classes: State

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(request, response) ⇒ Transaction

Returns a new instance of Transaction.



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# File 'lib/utopia/middleware/content/node.rb', line 103

def initialize(request, response)
  @begin_tags = []
  @end_tags = []

  @request = request
  @response = response
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args) ⇒ Object 



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# File 'lib/utopia/middleware/content/node.rb', line 251

def method_missing(name, *args)
  @begin_tags.reverse_each do |state|
    if state.node.respond_to? name
      return state.node.send(name, *args)
    end
  end

  super
end

Instance Attribute Details

#begin_tags ⇒ Object (readonly)

Begin tags represents a list from outer to inner most tag. At any point in parsing xml, begin_tags is a list of the inner most tag, then the next outer tag, etc. This list is used for doing dependent lookups.



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# File 'lib/utopia/middleware/content/node.rb', line 125

def begin_tags
  @begin_tags
end

#end_tags ⇒ Object (readonly)

End tags represents a list of execution order. This is the order that end tags have appeared when evaluating nodes.



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# File 'lib/utopia/middleware/content/node.rb', line 129

def end_tags
  @end_tags
end

#request ⇒ Object (readonly)

Returns the value of attribute request.



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# File 'lib/utopia/middleware/content/node.rb', line 119

def request
  @request
end

#response ⇒ Object (readonly)

Returns the value of attribute response.



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# File 'lib/utopia/middleware/content/node.rb', line 120

def response
  @response
end

Instance Method Details

#attributes ⇒ Object 



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# File 'lib/utopia/middleware/content/node.rb', line 131

def attributes
  return current.attributes
end

#binding ⇒ Object 



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# File 'lib/utopia/middleware/content/node.rb', line 111

def binding
  super
end

#cdata(text) ⇒ Object 



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# File 'lib/utopia/middleware/content/node.rb', line 195

def cdata(text)
  current.cdata(text)
end

#content ⇒ Object 



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# File 'lib/utopia/middleware/content/node.rb', line 139

def content
  @end_tags[-1].content
end

#current ⇒ Object 



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# File 'lib/utopia/middleware/content/node.rb', line 135

def current
  @begin_tags[-1]
end

#first ⇒ Object 



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# File 'lib/utopia/middleware/content/node.rb', line 147

def first
  @begin_tags[0]
end

#lookup(tag) ⇒ Object 



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# File 'lib/utopia/middleware/content/node.rb', line 232

def lookup(tag)
  result = tag
  node = nil
  
  @begin_tags.reverse_each do |state|
    result = state.lookup(result)
    
    node ||= state.node if state.node.respond_to? :lookup

    return result if Node === result
  end
  
  @end_tags.reverse_each do |state|
    return state.node.lookup(result) if state.node.respond_to? :lookup
  end
  
  return nil
end

#parent ⇒ Object 



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# File 'lib/utopia/middleware/content/node.rb', line 143

def parent
  end_tags[-2]
end

#parse_xml(xml_data) ⇒ Object 



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# File 'lib/utopia/middleware/content/node.rb', line 115

def parse_xml(xml_data)
  XNode::Processor.new(xml_data, self).parse
end

#render_node(node, attributes = {}) ⇒ Object 



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# File 'lib/utopia/middleware/content/node.rb', line 225

def render_node(node, attributes = {})
  state = State.new(attributes, node)
  @begin_tags << state
  
  return tag_end
end

#tag(name, attributes) {|node| ... } ⇒ Object

Yields:

  • (node) 


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# File 'lib/utopia/middleware/content/node.rb', line 151

def tag(name, attributes, &block)
  tag = Tag.new(name, attributes)

  node = tag_begin(tag)

  yield node if block_given?

  tag_end(tag)
end

#tag_begin(tag, node = nil) ⇒ Object 



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# File 'lib/utopia/middleware/content/node.rb', line 176

def tag_begin(tag, node = nil)
  node ||= lookup(tag)

  if node
    state = State.new(tag, node)
    @begin_tags << state

    if node.respond_to? :tag_begin
      node.tag_begin(self, state)
    end

    return node
  end

  current.tag_begin(tag)

  return nil
end

#tag_complete(tag, node = nil) ⇒ Object 



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# File 'lib/utopia/middleware/content/node.rb', line 161

def tag_complete(tag, node = nil)
  if tag.name == "content"
    current.markup(content)
  else
    node ||= lookup(tag)

    if node
      tag_begin(tag, node)
      tag_end(tag)
    else
      current.tag_complete(tag)
    end
  end
end

#tag_end(tag = nil) ⇒ Object 



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# File 'lib/utopia/middleware/content/node.rb', line 199

def tag_end(tag = nil)
  top = current

  if top.tags.empty?
    if top.node.respond_to? :tag_end
      top.node.tag_end(self, top)
    end

    @end_tags << top
    buffer = top.call(self)

    @begin_tags.pop
    @end_tags.pop

    if current
      current.markup(buffer)
    end

    return buffer
  else
    current.tag_end(tag)
  end
  
  return nil
end