Class: Rubic::Environment

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

Instance Method Summary collapse

Constructor Details

#initialize(outer = nil) ⇒ Environment

Returns a new instance of Environment.



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# File 'lib/rubic/environment.rb', line 5

def initialize(outer=nil)
  @outer = outer
  @table = {}
end

Instance Method Details

#bind(params, args) ⇒ Object 



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# File 'lib/rubic/environment.rb', line 24

def bind(params, args)
  if params.size != args.size
    raise RubicRuntimeError, "wrong number of arguments (#{args.size} for #{params.size})"
  end

  params.each.with_index do |name, i|
    @table[name] = args[i]
  end
end

#defvar(name, value) ⇒ Object Also known as: []= 



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# File 'lib/rubic/environment.rb', line 10

def defvar(name, value)
  @table[name] = value
end

#refvar(name) ⇒ Object Also known as: [] 



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# File 'lib/rubic/environment.rb', line 14

def refvar(name)
  if @table.key? name
    @table[name]
  elsif @outer
    @outer.refvar(name)
  else
    raise RubicRuntimeError, "undefined variable `#{name}'"
  end
end