Class: Utopia::Trenni::Scanner

Inherits:
StringScanner
  • Object
show all
Defined in:
lib/utopia/trenni.rb

Constant Summary collapse

TEXT = 
/([^<#]|<(?!\?r)|#(?!\{)){1,1024}/m

Instance Method Summary collapse

Constructor Details

#initialize(callback, string) ⇒ Scanner

Returns a new instance of Scanner.



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# File 'lib/utopia/trenni.rb', line 58

def initialize(callback, string)
	@callback = callback
	super(string)
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/utopia/trenni.rb', line 63

def parse
	until eos?
		pos = self.pos

		scan_text
		scan_expression

		if pos == self.pos
			raise StandardError.new "Could not scan current input #{self.pos} #{eos?}!"
		end
	end
end

#scan_expression ⇒ Object 



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# File 'lib/utopia/trenni.rb', line 82

def scan_expression
	if scan(/\#\{/)
		level = 1
		code = ""

		until eos? || level == 0
			if scan(/[^"'\{\}]+/m)
				code << matched
			end

			if scan(/"(\\"|[^"])*"/m)
				code << matched
			end

			if scan(/'(\\'|[^'])*'/m)
				code << matched
			end

			if scan(/\{/)
				code << matched
				level += 1
			end

			if scan(/\}/)
				code << matched if level > 1
				level -= 1
			end
		end

		if level == 0
			@callback.output(code)
		else
			raise StandardError.new "Could not find end of expression #{self}!"
		end
	elsif scan(/<\?r/)
		if scan_until(/(.*?)\?>/m)
			@callback.expression(self[1])
		else
			raise StandardError.new "Could not find end of expression #{self}!"
		end
	end
end

#scan_text ⇒ Object 



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# File 'lib/utopia/trenni.rb', line 76

def scan_text
	if scan(TEXT)
		@callback.text(matched)
	end
end