Class: Opal::Nodes::Args::ExtractPostOptarg

Inherits:

Base

Object
Base
Opal::Nodes::Args::ExtractPostOptarg

Defined in:: opal/lib/opal/nodes/args/extract_post_optarg.rb

Overview

This node is responsible for extracting a single optional post-argument

args_to_keep is the number of required post-arguments

def m(a = 1, b, c, d); end becomes something like: if post_args.length > 3 a = post_args[0] post_args = post_args[1..-1] end

Instance Attribute Summary

Attributes inherited from Base

#compiler , #type

Instance Method Summary collapse

#compile ⇒ Object

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_nil , #fragment , handle , handlers , #has_rescue_else? , #helper , #in_ensure , #in_ensure? , #in_while? , #initialize , #process , #push , #recv , #recv? , #s , #scope , #stmt , #stmt? , truthy_optimize? , #unshift , #while_loop , #with_temp , #wrap

Methods included from Helpers

#conditional_send , #current_indent , #empty_line , #indent , #js_falsy , #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`

# File 'opal/lib/opal/nodes/args/extract_post_optarg.rb', line 24
def compile
 add_temp name
 line "if ($post_args.length > #{args_to_keep}) {"
 line "#{name} = $post_args[0];"
 line " $post_args.splice(0, 1);"
 line "}"
 return if default_value.children[1] == :undefined
 line "if (#{name} == null) {"
 line "#{name} = ", expr(default_value), ";"
 line "}"
end