Class: Opal::Nodes::IFlipFlop

Inherits:
Base
  • Object
show all
Defined in:
opal/lib/opal/nodes/if.rb

Direct Known Subclasses

EFlipFlop

Instance Attribute Summary

Attributes inherited from Base

#compiler, #sexp, #type

Attributes included from Closure::NodeSupport

#closure

Instance Method Summary collapse

Methods inherited from Base

#add_gvar, #add_ivar, #add_local, #add_temp, #children, children, #class_variable_owner, #class_variable_owner_nesting_level, #comments, #compile_to_fragments, #error, #expr, #expr?, #expr_or_empty, #expr_or_nil, #fragment, handle, handlers, #has_rescue_else?, #helper, #in_ensure, #in_ensure?, #in_resbody, #in_resbody?, #in_rescue, #in_while?, #initialize, #process, #push, #recv, #recv?, #s, #scope, #source_location, #stmt, #stmt?, #top_scope, truthy_optimize?, #unshift, #while_loop, #with_temp, #wrap

Methods included from Closure::NodeSupport

#closure_is?, #compile_catcher, #generate_thrower, #generate_thrower_without_catcher, #in_closure, #pop_closure, #push_closure, #select_closure, #thrower

Methods included from Helpers

#current_indent, #empty_line, #indent, #js_truthy, #js_truthy_optimize, #line, #mid_to_jsid, #property, #valid_name?

Constructor Details

This class inherits a constructor from Opal::Nodes::Base

Instance Method Details

#compile ⇒ Object

We create a function that we put in the top scope, that stores the state of our flip-flop. We pass to it functions that are ran with the current binding.



407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
 
# File 'opal/lib/opal/nodes/if.rb', line 407

def compile
  helper :truthy

  fun_name = top_scope.new_temp
  ff = "#{fun_name}.$$ff"

  push "(typeof #{fun_name} === 'undefined' ? (#{fun_name} = function(from, to){"
  push "  if (typeof #{ff} === 'undefined') #{ff} = false;"
  push "  var retval = #{ff};"
  push "  if (!#{ff}) {"
  push "    #{ff} = retval = $truthy(from());"
  push "  }"
  push "  #{excl}if (#{ff}) {"
  push "    if ($truthy(to())) #{ff} = false;"
  push "  }"
  push "  return retval;"
  push "}) : #{fun_name})("
  push "  function() { ", stmt(compiler.returns(from)), " },"
  push "  function() { ", stmt(compiler.returns(to)), " }"
  push ")"
end

#excl ⇒ Object

Is this an exclusive flip flop? If no, run both branches



401
402
403
 
# File 'opal/lib/opal/nodes/if.rb', line 401

def excl
  ""
end