Class: Rbfunge::Memory_Stack

Inherits:
Object
  • Object
show all
Defined in:
lib/rbfunge/memory_stack.rb

Overview

memory stack for Befunge programs

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Memory_Stack

initialize the memory



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# File 'lib/rbfunge/memory_stack.rb', line 6

def initialize
	@stack = []
end

Instance Method Details

#dup ⇒ Object

duplicate the top item



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# File 'lib/rbfunge/memory_stack.rb', line 29

def dup
	top = pop
	push top
	push top
end

#pop ⇒ Object

pop the first top element off the stack



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# File 'lib/rbfunge/memory_stack.rb', line 11

def pop
	return @stack.empty? ? 0 : @stack.pop
end

#push(value) ⇒ Object

push an element onto the stack



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# File 'lib/rbfunge/memory_stack.rb', line 16

def push(value)
	@stack.push value
end

#swap ⇒ Object

swap the top two items in the stack



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# File 'lib/rbfunge/memory_stack.rb', line 21

def swap
	first = pop
	second = pop
	push first
	push second
end