Class: Opal::Nodes::ConstNode

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

Constant Summary collapse

OPTIMIZED_ACCESS_CONSTS = 
%i[
  BasicObject Object Module Class Opal Kernel NilClass
].freeze

Instance Attribute Summary

Attributes inherited from Base

#compiler, #sexp, #type

Attributes included from Opal::Nodes::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 Opal::Nodes::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/constants.rb', line 12

def compile
  if magical_data_const?
    push('$__END__')
  elsif optimized_access?
    helper :"#{name}"
    push "$#{name}"
  elsif const_scope == s(:cbase)
    push "#{top_scope.absolute_const}('#{name}')"
  elsif const_scope
    push "#{top_scope.absolute_const}(", recv(const_scope), ", '#{name}')"
  elsif compiler.eval?
    push "#{scope.relative_access}('#{name}')"
  else
    push "#{scope.relative_access}('#{name}')"
  end
end

#magical_data_const? ⇒ Boolean

Ruby has a magical const DATA that should be processed in a different way:

  1. When current file contains END in the end of the file DATA const should be resolved to the string located after END
  2. When current file doesn't have END section DATA const should be resolved to a regular ::DATA constant

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/constants.rb', line 35

def magical_data_const?
  const_scope.nil? && name == :DATA && compiler.eof_content
end

#optimized_access? ⇒ Boolean

For a certain case of calls like ::Opal.coerce_to? we can optimize the calls. We can be sure they are defined from the beginning.

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/constants.rb', line 46

def optimized_access?
  const_scope == s(:cbase) && OPTIMIZED_ACCESS_CONSTS.include?(name)
end