Class: Opal::Nodes::BaseFlipFlop
Instance Attribute Summary
Attributes inherited from Base
Attributes included from Closure::NodeSupport
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
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# File 'opal/lib/opal/nodes/if.rb', line 398 def compile helper :truthy func_name = top_scope.new_temp flip_flop_state = "#{func_name}.$$ff" # Start function definition, checking and initializing it if necessary push "(#{func_name} = #{func_name} || function(_start_func, _end_func){" # If flip flop state is not defined, set it to false push " var flip_flop = #{flip_flop_state} || false;" # If flip flop state is false, call the 'start_condition' function and store its truthy result into flip flop state push " if (!flip_flop) #{flip_flop_state} = flip_flop = $truthy(_start_func());" # If flip flop state is true, call the 'end_condition' function and set flip flop state to false if 'end_condition' is truthy push "#{excl}if (flip_flop && $truthy(_end_func())) #{flip_flop_state} = false;" # Return current state of flip flop push " return flip_flop;" # End function definition push "})(" # Call the function with 'start_condition' and 'end_condition' arguments wrapped in functions to ensure correct binding and delay evaluation push " function() { ", stmt(compiler.returns(start_condition)), " }," push " function() { ", stmt(compiler.returns(end_condition)), " }" push ")" end