Class: CodeTools::AST::BackRef

Inherits:
Node
  • Object
show all
Defined in:
lib/rubinius/code/ast/variables.rb

Constant Summary collapse

Kinds = 
{
  :~ => 0,
  :& => 1,
  :"`" => 2,
  :"'" => 3,
  :+ => 4
}

Instance Attribute Summary collapse

Attributes inherited from Node

#line

Instance Method Summary collapse

Methods inherited from Node

#ascii_graph, #attributes, #children, match_arguments?, match_send?, #new_block_generator, #new_generator, #node_name, #or_bytecode, #pos, #set_child, transform, #transform, transform_comment, transform_kind, transform_kind=, transform_name, #value_defined, #visit, #walk

Constructor Details

#initialize(line, ref) ⇒ BackRef

Returns a new instance of BackRef.



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# File 'lib/rubinius/code/ast/variables.rb', line 8

def initialize(line, ref)
  @line = line
  @kind = ref
end

Instance Attribute Details

#kind ⇒ Object

Returns the value of attribute kind.



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# File 'lib/rubinius/code/ast/variables.rb', line 6

def kind
  @kind
end

Instance Method Details

#bytecode(g) ⇒ Object 



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# File 'lib/rubinius/code/ast/variables.rb', line 29

def bytecode(g)
  pos(g)
  g.last_match mode, 0
end

#defined(g) ⇒ Object 



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# File 'lib/rubinius/code/ast/variables.rb', line 34

def defined(g)
  if @kind == :~
    g.push_literal "global-variable"
    g.string_dup
    return
  end

  f = g.new_label
  done = g.new_label

  g.last_match mode, 0
  g.goto_if_nil f

  g.push_literal "global-variable"
  g.string_dup

  g.goto done

  f.set!
  g.push_nil

  done.set!
end

#mode ⇒ Object 



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# File 'lib/rubinius/code/ast/variables.rb', line 21

def mode
  unless mode = Kinds[@kind]
    raise "Unknown backref: #{@kind}"
  end

  mode
end

#to_sexp ⇒ Object 



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# File 'lib/rubinius/code/ast/variables.rb', line 58

def to_sexp
  [:back_ref, @kind]
end