Class: Nitro::Elements::Listener

Inherits:
Object
  • Object
show all
Includes:
REXML::StreamListener
Defined in:
lib/nitro/compiler/elements.rb

Overview

:nodoc: all

Constant Summary collapse

PREFIX_RE = 
/^#{Element.prefix}:/
CAPITALIZED_RE = 
/^[A-Z]/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(compiler) ⇒ Listener

Returns a new instance of Listener.



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# File 'lib/nitro/compiler/elements.rb', line 21

def initialize(compiler)
  super()
  @compiler = compiler
  @buffer = ''
  @stack = []
end

Instance Attribute Details

#buffer ⇒ Object

Returns the value of attribute buffer.



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# File 'lib/nitro/compiler/elements.rb', line 18

def buffer
  @buffer
end

#stack ⇒ Object

Returns the value of attribute stack.



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# File 'lib/nitro/compiler/elements.rb', line 19

def stack
  @stack
end

Instance Method Details

#comment(c) ⇒ Object 



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# File 'lib/nitro/compiler/elements.rb', line 133

def comment(c)
  unless Glue::Template.strip_xml_comments
    @buffer << "<!--#{c}-->"
  end
end

#instruction(name, attributes) ⇒ Object 



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# File 'lib/nitro/compiler/elements.rb', line 129

def instruction(name, attributes)
  @buffer << "<?#{name}#{attributes}?>"
end

#is_element?(name) ⇒ Boolean

Check if a tag is a Nitro::Element. If found, it also tries to auto-extend the klass.

returns the Element class if found

Returns:

  • (Boolean) 


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# File 'lib/nitro/compiler/elements.rb', line 78

def is_element?(name)
  # Doesn't support modulized classes
#      name = name.demodulize
  return false unless name =~ PREFIX_RE or name =~ CAPITALIZED_RE

  name = name.gsub(PREFIX_RE,'').camelize if name =~ PREFIX_RE

  # First try to use Nitro::Element::xxx then ::xxx
  
  begin
    klass = Class.by_name("Nitro::Element::#{name}")
  rescue
  end

  # Look into the module the controller's module if any

  begin
    namespace = @compiler.controller.name
    if /::/ =~ namespace
      namespace = namespace.gsub( /::[a-zA-Z]+$/, "::#{name}" )
      klass = Class.by_name(namespace)
    end
  rescue
  end unless klass

  # Look in the root module

  begin
    klass = Class.by_name(name)
  rescue
  end unless klass

  return false unless klass.kind_of?( Class )

  # Try to auto-extend

  unless klass.ancestors.include? Nitro::Element
    if Element.auto_extend
      klass.send(:include, Nitro::ElementMixin)
    else
      return false
    end
  end

  return klass
end

#tag_end(name) ⇒ Object 



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# File 'lib/nitro/compiler/elements.rb', line 62

def tag_end(name)    
  # check if the name starts with the element prefix, or
  # is capitalized.
  if is_element? name
    obj, @buffer, @parent = @stack.pop
    @buffer << obj.render
  else
    @buffer << "</#{name}>"
  end
end

#tag_start(name, attributes) ⇒ Object 



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# File 'lib/nitro/compiler/elements.rb', line 31

def tag_start(name, attributes)    
  # check if the name starts with the element prefix, or
  # is capitalized.
  
  if klass = is_element?(name)

    obj = klass.new 
    attributes.each do | k, v | 
      obj.instance_variable_set("@#{k}", v)
    end        
      
    @stack.push [obj, @buffer, @parent]
      
    @buffer = obj._text
    @parent.add_child(obj) if @parent
      
    @parent = obj

  else # This is a static element.
    attrs = []
    
    attributes.each do | k, v | 
      attrs << %|#{k}="#{v}"|
    end
    
    attrs = attrs.empty? ? nil : " #{attrs.join(' ')}"
    
    @buffer << "<#{name}#{attrs}>"
  end
end

#text(str) ⇒ Object 



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# File 'lib/nitro/compiler/elements.rb', line 125

def text(str)
  @buffer << str
end