Class: N::RubyShader

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

Overview

Convert the xhtml script to actual Ruby code, ready to be evaluated.

Instance Attribute Summary

Attributes inherited from Shader

#next_stage

Instance Method Summary collapse

Methods inherited from Shader

#<<, #initialize, #process_next

Constructor Details

This class inherits a constructor from N::Shader

Instance Method Details

#load_statically_included(filename) ⇒ Object

Loads and statically includes a file.



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# File 'lib/nitro/shaders.rb', line 140

def load_statically_included(filename)
	Logger.debug "Statically including '#{filename}'" if $DBG
	
	text = File.read(filename)
	text.gsub!(/<\?xml.*\?>/, '')
	text.gsub!(/<\/?root(.*?)>/m, ' ');
	
	return text
end

#process(hash, text) ⇒ Object

Convert the xhtml script to actual Ruby code, ready to be evaluated.

– Investigate: perhaps xl:href should be used to be XLink compatible? ++



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# File 'lib/nitro/shaders.rb', line 68

def process(hash, text)
	# strip the xml header! (interracts with the following gsub!)
	text.gsub!(/<\?xml.*\?>/, "")

	# Statically include sub script files.
	# The target file is included at compile time.
	#
	# gmosx: must be xformed before the <?r pi.
	#
	# Example:		
	# <?include xl:href="root/myfile.sx" ?>
	
	text.gsub!(/<\?include href="(.*?)"(.*)\?>/) { |match|
		# gmosx: xmm match matches the whole string.
		# match = overload_path($1)				
		load_statically_included("#$root_dir/#$1")
	}

	# xform include instructions <include href="xxx" />
	# must be transformed before the processinc instructions.
	# Useful to include fragments cached on disk
  #
	# gmosx, FIXME: NOT TESTED! test and add caching.
	# add load_statically_included fixes.

	text.gsub!(/<include href="(.*?)"(.*)(.?)\/>/) { |match|
		"<?r File.read( '\#\{@dispatcher.root\}/#$1' ?>"
	}
	
	# xform render/inject instructions <render href="xxx" />
	# must be transformed before the processinc instructions.

	text.gsub!(/<inject href="(.*?)"(.*)(.?)\/>/) { |match|
		"<?r render '/#$1' ?>"
	}
	
	text.gsub!(/<render href="(.*?)"(.*)(.?)\/>/) { |match|
		"<?r render '/#$1' ?>"
	}
	
	# remove <root> elements. typically removed by xslt but lets
	# play it safe.
	
	text.gsub!(/<(\/)?root>/, '')
	
	# runtime ruby code.
	
	# xform the processing instructions, use <?r as
	# a marker.
	
	text.gsub!(/\?>/, "\n@out << %^")
	text.gsub!(/<\?r(\s?)/, "^\n")
	
	# xform alternative code tags (very useful in xsl stylesheets)
	
	text.gsub!(/<\/ruby>/, "\n@out << %^")
	text.gsub!(/<ruby>/, "^\n")
	
	# compile time ruby code.
	# Usefull for example to prevaluate localization.
	
	text.gsub!(/\#\[(.*?)\]/) { |match|
		eval($1)
	}
	
	text =  "@out << %^" + text + "^"

	process_next(hash, text)
end