Class: Yadriggy::VariableCall

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

Overview

Method call without parentheses or arguments.

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, #value_in_class

Constructor Details

#initialize(sexp) ⇒ VariableCall

Returns a new instance of VariableCall.



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# File 'lib/yadriggy/ast.rb', line 219

def initialize(sexp)
  super(sexp[1])
end

Class Method Details

.tag ⇒ Object 



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# File 'lib/yadriggy/ast.rb', line 217

def self.tag() :vcall 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 226

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

#const_value ⇒ Object

Returns Undef because const_value is supposed to return the resulting value of executing this variable call.



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# File 'lib/yadriggy/ast_value.rb', line 98

def const_value() Undef end

#do_invocation ⇒ Object

Gets the resulting value of the invocation of this method.



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# File 'lib/yadriggy/ast_value.rb', line 119

def do_invocation()
  obj = get_receiver_object
  if obj.nil?
    Undef
  else
    begin
      obj.send(@name)
    rescue NameError
      Undef
    end
  end
end

#invoked_method ⇒ Object

Gets a Method object called by this AST node. If this AST node belongs to UnboundMethod, Undef will be returned.



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# File 'lib/yadriggy/ast_value.rb', line 104

def invoked_method()
  obj = get_receiver_object
  if obj.nil?
    Undef
  else
    begin
      obj.method(@name)
    rescue NameError
      Undef
    end
  end
end

#value ⇒ Object

Gets an ASTree object representing the method body invoked by this AST node. Undef may be returned if the method is not found.



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# File 'lib/yadriggy/ast_value.rb', line 86

def value()
  mth = invoked_method
  if mth == Undef
    Undef
  else
    root.reify(mth) || Undef
  end
end