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

Inherits:
Base
  • Object
show all
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, #sexp, #type

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_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 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 



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# 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