Class: UIC::MetaData

Inherits:
Object
  • Object
show all
Defined in:
lib/ruic/assets.rb

Defined Under Namespace

Classes: AssetBase

Constant Summary collapse

HIER = 
{}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(xml) ⇒ MetaData

Returns a new instance of MetaData.



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# File 'lib/ruic/assets.rb', line 273

def initialize(xml)
	@by_name = {'AssetBase'=>AssetBase}

	doc = Nokogiri.XML(xml)
	hack_in_slide_names!(doc)

	HIER.each do |class_name,parent_class_name|
		parent_class = @by_name[parent_class_name]
		el = doc.root.at(class_name)
		@by_name[class_name] = create_class(el,parent_class,el.name)
	end

	# Extend well-known classes with script interfaces after they are created
	@by_name['State'] = @by_name['Slide']
	@by_name['Slide'].instance_eval do
		attr_accessor :index, :name
		define_method :inspect do
			"<slide ##{index} of #{@el['component'] || @el.parent['component']}>"
		end
		define_method(:slide?){ true }
	end

	refmat = @by_name['ReferencedMaterial']
	@by_name['MaterialBase'].instance_eval do
		define_method :replace_with_referenced_material do
			type=='ReferencedMaterial' ? self : presentation.replace_asset( self, 'ReferencedMaterial', name:name )
		end
	end

	@by_name['Path'].instance_eval do
		define_method(:anchors){ find _type:'PathAnchorPoint' }
	end

end

Instance Attribute Details

#by_name ⇒ Object (readonly)

Returns the value of attribute by_name.



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# File 'lib/ruic/assets.rb', line 264

def by_name
  @by_name
end

Instance Method Details

#create_class(el, parent_class, name, new_defaults = {}) ⇒ Object

Creates a class from MetaData.xml with accessors for the listed. Instances of the class are associated with a presentation and know how to get/set values in that XML based on value types, slides, defaults. Also used to create classes from effects, materials, and behavior preambles.

Parameters:

  • el (Nokogiri::XML::Element) —

    the element in MetaData.xml representing this class.

  • parent_class (Class) —

    the asset class to inherit from.

  • name (String) —

    the name of this class.

  • new_defaults (Hash) (defaults to: {}) —

    hash mapping attribute name to a custom default value (as string) for this class.



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# File 'lib/ruic/assets.rb', line 316

def create_class(el,parent_class,name,new_defaults={})
	Class.new(parent_class) do
		@name = name.to_s
		@properties = Hash[ el.css("Property").map do |e|
			type = e['type'] || (e['list'] ? 'String' : 'Float')
			type = "Float" if type=="float"
			property = begin
				UIC::Property.const_get(type).new(e)
			rescue NameError
				warn "WARNING: Unsupported property type '#{type}' on\n#{e}\nTreating this as a String."
				UIC::Property::String.new(e)
			end
			new_defaults.delete(property.name)
			[ property.name, property ]
		end ]

		new_defaults.each do |name,value|
			if prop=properties[name] # look in ancestor classes
				@properties[name] = prop.dup
				@properties[name].default = value
			end
		end

		def self.inspect
			@name
		end
	end
end

#hack_in_slide_names!(doc) ⇒ Object 



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# File 'lib/ruic/assets.rb', line 350

def hack_in_slide_names!(doc)
	doc.at('Slide') << '<Property name="name" formalName="Name" type="String" default="Slide" hidden="True" />'
end

#new_instance(presentation, el) ⇒ Object 



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# File 'lib/ruic/assets.rb', line 345

def new_instance(presentation,el)
	klass = @by_name[el.name] || create_class(el,@by_name['Asset'],el.name)
	klass.new(presentation,el)
end