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