Class: PLang::VM::Environment

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Environment

Returns a new instance of Environment.



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# File 'lib/vm/environment.rb', line 6

def initialize
  @vars = Hash.new
  @objects = Hash.new
end

Instance Attribute Details

#parent ⇒ Object

Returns the value of attribute parent.



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# File 'lib/vm/environment.rb', line 4

def parent
  @parent
end

Instance Method Details

#add_lambda(id, lamb) ⇒ Object

TODO: new operator to add lambdas



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# File 'lib/vm/environment.rb', line 31

def add_lambda(id, lamb)
  v = get_var(id)
  if v
    if v.id == :lambda and lamb.id == :lambda
      while v.params[1].id == :lambda
        v = v.params[1]
      end
      v.params[1] = lamb
    else
      raise "TODO: Environment#add_lambda#2"
    end
  else
    raise "TODO: Environment#add_lambda#1"
  end
end

#get_var(id) ⇒ Object 



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# File 'lib/vm/environment.rb', line 19

def get_var(id)
  v = @vars[id]
  if v
    return v
  elsif @parent
    return @parent.get_var(id)
  else
    raise "NameError: undefined variable '#{id}'"
  end
end

#set_object_var(form, object) ⇒ Object 



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# File 'lib/vm/environment.rb', line 47

def set_object_var(form, object)
  if form.type == :object
    if form.id.value == object.id
      form.params.each_with_index do |param, i|
        case param.type 
          when :object
            set_object_var(param, object.params[i])
          when :id
            unless param.value == :_
              if object.id == :integer
                set_var(param.value, PObject.new(:integer, [object.params[i]]))
              elsif object.id == :decimal
                set_var(param.value, PObject.new(:decimal, [object.params[i]]))
              elsif object.id == :char
                set_var(param.value, PObject.new(:char, [object.params[i]]))
              elsif object.id == :string
                set_var(param.value, PObject.new(:string, [object.params[i]]))
              else
                set_var(param.value, object.params[i])
              end
            end
          else
            unless param.value == object.params[i].params[0]
              raise "TODO: Environment#set_object_var#3"
            end
        end
      end
    else
      raise "TODO: Environment#set_object_var#1"
    end
  else
    raise "TODO: Environment#set_object_var#2"
  end
end

#set_var(id, value) ⇒ Object 



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# File 'lib/vm/environment.rb', line 11

def set_var(id, value)
  unless @vars[id]
    @vars[id] = value
  else
    raise "LetError: TODO"
  end
end