Class: AjLisp::InputSource

Inherits:
Object
  • Object
show all
Defined in:
lib/ajlisp/input_source.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ InputSource

Returns a new instance of InputSource.



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# File 'lib/ajlisp/input_source.rb', line 5

def initialize
	@line = ""
	@position = 0
	@chars = []
end

Instance Method Details

#nextChar ⇒ Object 



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# File 'lib/ajlisp/input_source.rb', line 11

def nextChar
	char = @chars.pop
	
	if char
		return char
	end

	while @line.length <= @position
		@line = gets
		@position = 0

		if @line == nil
				return nil
		end				
	end

	char = @line[@position]
	@position += 1
	return char
end

#pushChar(ch) ⇒ Object 



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# File 'lib/ajlisp/input_source.rb', line 32

def pushChar(ch)
	@chars.push ch
end