Class: Ascode::Interpreter::Environment

Inherits:
Object
  • Object
show all
Defined in:
lib/ascode/interpreter/environment.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ast = "") ⇒ Environment

Returns a new instance of Environment.



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# File 'lib/ascode/interpreter/environment.rb', line 8

def initialize(ast = "")
  @ast = ast
  @stack = []
  @register = nil
end

Instance Attribute Details

#ast ⇒ Object

Returns the value of attribute ast.



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# File 'lib/ascode/interpreter/environment.rb', line 6

def ast
  @ast
end

#register ⇒ Object

Returns the value of attribute register.



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# File 'lib/ascode/interpreter/environment.rb', line 6

def register
  @register
end

#stack ⇒ Object

Returns the value of attribute stack.



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# File 'lib/ascode/interpreter/environment.rb', line 6

def stack
  @stack
end

Instance Method Details

#duplicate ⇒ Object 



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# File 'lib/ascode/interpreter/environment.rb', line 43

def duplicate
  a = pop
  push a
  push a
end

#pop(ask = true) ⇒ Object 



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# File 'lib/ascode/interpreter/environment.rb', line 26

def pop(ask = true)
  value = @stack.pop
  if value
    value
  elsif ask
    IO.input itself
    @stack.pop
  end
end

#push(what) ⇒ Object 



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# File 'lib/ascode/interpreter/environment.rb', line 14

def push(what)
  @stack.push what
end

#reg_copy ⇒ Object 



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# File 'lib/ascode/interpreter/environment.rb', line 18

def reg_copy
  @register = pop
end

#reg_paste ⇒ Object 



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# File 'lib/ascode/interpreter/environment.rb', line 22

def reg_paste
  push @register
end

#swap ⇒ Object 



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# File 'lib/ascode/interpreter/environment.rb', line 36

def swap
  a = pop false
  b = pop false
  push a
  push b
end