Class: General::GMeta

Inherits:
GTemplate show all
Defined in:
lib/gtemplates/gmeta.rb

Overview

Created: 1 - 31 - 2016

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from GTemplate

#match, #regex

Methods inherited from GBaseTemplate

#apply, #apply_all, #to_s

Constructor Details

#initialize(top, bottom, source = nil) ⇒ GMeta

Creates a new GMeta

Parameter: top - the top end of the meta (in preparts) Parameter: bottom - the bottom end of the data (in preparts) Parameter: source - the source of the file



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# File 'lib/gtemplates/gmeta.rb', line 95

def initialize top, bottom, source=nil
	@top    = top
	@bottom = bottom
	@source = source
end

Class Method Details

.load(path) ⇒ Object 



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# File 'lib/gtemplates/gmeta.rb', line 29

def self.load path
	# Read file
	string = IO.read path

	# Prepartial types
	ptypes = [
		General::GExtend,
		General::GInclude,
		General::GYield,
		General::GPretext
	]

	# Breakdown algorithm
	preparts = []
	m = nil
	loop do
		# Match the front of the string to a preprocessor
		prepart = ptypes.find { |ptype| m = ptype::REGEX.match(string) }

		# Raise error if no matching prepart can be found
		if prepart.nil?
			raise GError.new "Unmatched prepartial at #{(string.length <= 5 ? string : string[0..5] + "...").inspect}"
		end

		# Add the partial to the array
		preparts << prepart.new(m)

		# Trim the front of the string
		string = string[m.end(0)..-1]

		# End when string is empty
		break if string.length == 0
	end

	# Find an extend
	extindex = preparts.index { |prepart| prepart.is_a? General::GExtend }

	# Run extend algorithm (throw error if extend is found elsewhere)
	if extindex == 0
		preparts = GMeta.load(preparts[extindex].filename+General::GIO::EXTENSION).gextend(preparts[1..-1])
	elsif !extindex.nil? && extindex > 0
		raise GError.new "@@extend prepartial needs to be at beginning of template."
	end

	# Check for multiple yields
	yields = preparts.find_all{ |prepart| prepart.is_a? General::GYield  }
	if yields.length > 1
		raise GError.new "@@yield prepartial can only appear ONCE!"
	end

	# Find the yield
	yindex = preparts.index{ |prepart| prepart.is_a? General::GYield }

	# Return a new meta file if yield is found. Else default is end.
	unless yindex.nil?
		return self.new preparts[0...yindex], preparts[(yindex + 1)..-1], path
	else
		return self.new preparts, [], path
	end
end

Instance Method Details

#gextend(preparts) ⇒ Object

Extends the given preparts from the GMeta

Parameter: preparts - the preparts array to extend

Returns: the extended preparts



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# File 'lib/gtemplates/gmeta.rb', line 106

def gextend preparts
	return @top + preparts + [General::GPretext.new("\r\n")] + @bottom
end