Class: Opal::Nodes::ArgsNode

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

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

ruby allows for args with the same name, if the arg starts with a '', like: def funny_method_name(, _) puts _ end but javascript in strict mode does not allow for args with the same name ruby assigns the value of the first arg given funny_method_name(1, 2) => 1

  1. check for args starting with '_' and check if they appear multiple times
  2. leave the first appearance as it is and rename the other ones compiler result: function $$funny_method_name(, _$2)


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# File 'opal/lib/opal/nodes/args.rb', line 40

def compile
  same_arg_counter = {}
  children.each_with_index do |arg, idx|
    if multiple_underscore?(arg)
      same_arg_counter[arg] ||= 0
      same_arg_counter[arg]  += 1
      if same_arg_counter[arg] > 1
        arg = s(arg.type, :"#{arg.children[0]}_$#{same_arg_counter[arg]}")
      end
    end

    push ', ' if idx != 0
    push process(arg)
  end
end

#multiple_underscore?(arg) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/args.rb', line 56

def multiple_underscore?(arg)
  arg.type == :arg &&
    arg.children.count == 1 &&
    arg.children.first.to_s.start_with?('_') &&
    children.count(arg) > 1
end