Class: Yadriggy::InstanceVariable

Inherits:
Name show all
Defined in:
lib/yadriggy/ast.rb,
lib/yadriggy/ast_value.rb

Overview

Instance variable and class variable, such as @x and @@x. The value returned by name contains @.

Instance Attribute Summary

Attributes inherited from Name

#column, #line_no, #name

Attributes inherited from ASTnode

#parent, #usertype

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Name

#to_sym

Methods inherited from ASTnode

#add_child, #add_children, #const_value_in_class, #get_context_class, #get_receiver_object, #is_proc?, #pretty_print, #root, #source_location, #source_location_string

Constructor Details

#initialize(sexp) ⇒ InstanceVariable

Returns a new instance of InstanceVariable.



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# File 'lib/yadriggy/ast.rb', line 202

def initialize(sexp)
  super(sexp)
end

Class Method Details

.tags ⇒ Object 



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# File 'lib/yadriggy/ast.rb', line 200

def self.tags() [:@ivar, :@cvar] end

Instance Method Details

#accept(evaluator) ⇒ void

This method returns an undefined value.

A method for Visitor pattern.

Parameters:

  • evaluator (Eval) —

    the visitor of Visitor pattern.



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# File 'lib/yadriggy/ast.rb', line 209

def accept(evaluator)
  evaluator.instance_variable(self)
end

#const_value ⇒ Object 



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# File 'lib/yadriggy/ast_value.rb', line 218

def const_value()
  if name.start_with?("@@")
    clazz = get_context_class
    if clazz.frozen? && clazz.class_variable_defined?(name)
      return clazz.class_variable_get(name)
    end
  elsif name.start_with?("@")
    obj = get_receiver_object
    if obj.frozen? && obj&.instance_variable_defined?(name)
      return obj.instance_variable_get(name)
    end
  end

  Undef
end

#value ⇒ Object 



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# File 'lib/yadriggy/ast_value.rb', line 190

def value()
  if name.start_with?("@@")
    clazz = get_context_class
    if clazz.class_variable_defined?(name)
      return clazz.class_variable_get(name)
    end
  elsif name.start_with?("@")
    obj = get_receiver_object
    if obj&.instance_variable_defined?(name)
      return obj.instance_variable_get(name)
    end
  end

  Undef
end

#value_in_class(clazz) ⇒ Object 



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# File 'lib/yadriggy/ast_value.rb', line 206

def value_in_class(clazz)
  if name.start_with?("@@")
    if clazz.class_variable_defined?(name)
      return clazz.class_variable_get(name)
    else
      Undef
    end
  else
    value
  end
end