Class: N::Shader

Inherits:
Object show all
Defined in:
lib/nitro/shaders.rb

Overview

A shader defines a transformation-pipeline that tansforms the .xhtml files to actual ruby code ready for evaluation (compilation) by the engine.

Shaders are equivalend to the render-pipeline filters, ie they share their folded-filter design. – TODO: pipeline stage mixin to be reused in filters too. ++

Direct Known Subclasses

CompressShader, RubyShader, XSLTShader

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(next_stage = nil) ⇒ Shader

Returns a new instance of Shader.



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# File 'lib/nitro/shaders.rb', line 25

def initialize(next_stage = nil)
	@next_stage = next_stage
end

Instance Attribute Details

#next_stage ⇒ Object (readonly)

the next stage in the Shader pipeline.



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# File 'lib/nitro/shaders.rb', line 23

def next_stage
  @next_stage
end

Instance Method Details

#<<(next_stage = nil) ⇒ Object

Set the next stage of the pipeline.



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# File 'lib/nitro/shaders.rb', line 39

def << (next_stage = nil)
	@next_stage = next_stage
	return self
end

#process(hash, text) ⇒ Object

Process the text and optionally update the hash. The hash is a short, unique representation of the input text, typically used as a caching key.



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# File 'lib/nitro/shaders.rb', line 33

def process(hash, text)
	process_next(hash, text)
end

#process_next(hash, text) ⇒ Object

Process the next stage of the pipeline.



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# File 'lib/nitro/shaders.rb', line 46

def process_next(hash, text)
	if @next_stage
		return @next_stage.process(hash, text)
	else
		return hash, text
	end
end