Class: Reac

Inherits:
Object
  • Object
show all
Defined in:
lib/reac/reactivize.rb,
lib/reac.rb,
lib/reac/view.rb,
lib/reac/view/sdl.rb,
lib/reac/view/curses.rb

Overview

Reac::Reactivize

Direct Known Subclasses

Array, Call, Proc, Value

Defined Under Namespace

Modules: Reactivize Classes: Array, Call, CursesView, Proc, SDLView, Value, View

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args) ⇒ Object

construct tree of Reac::*

(instead of call the method)

to call it later



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# File 'lib/reac.rb', line 14

def method_missing(method, *args)
  Call.new(self, method, args)
end

Instance Attribute Details

#last_update ⇒ Object

Returns the value of attribute last_update.



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# File 'lib/reac.rb', line 9

def last_update
  @last_update
end

Class Method Details

.value(reac, tick = nil) ⇒ Object

caluculate the value by traversing the tree



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# File 'lib/reac.rb', line 25

def self.value(reac, tick=nil)
  return reac if not reac.is_a?(Reac) 

  # return cached data if already calculated
  return reac.data if tick && (reac.last_update == tick)

  reac.last_update = tick 
  case reac
  when Value
    reac.data
  when Call
    receiver = Reac.value(reac.receiver, tick)
    args = reac.args.map{|item|
      Reac.value(item, tick)
    }
    reac.data = receiver.__send__(reac.method, *args)
  when Proc
    reac.data = reac.proc.call
  when Array
    reac.data = reac.ary.map{|item| Reac.value(item, tick)}
  else
    raise "must not happen"
  end
end

Instance Method Details

#value ⇒ Object

caluculate the value (short-hand for Reac.value(x))



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# File 'lib/reac.rb', line 20

def value
  Reac.value(self)
end