Class: CodeTools::AST::Parameters

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

Instance Attribute Summary collapse

Attributes inherited from Node

#line

Instance Method Summary collapse

Methods inherited from Node

#ascii_graph, #attributes, #children, #defined, 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, required = nil, optional = nil, splat = nil, post = nil, kwargs = nil, kwrest = nil, block = nil) ⇒ Parameters

Returns a new instance of Parameters.



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# File 'lib/rubinius/code/ast/definitions.rb', line 307

def initialize(line, required=nil, optional=nil, splat=nil,
               post=nil, kwargs=nil, kwrest=nil, block=nil)
  @line = line
  @defaults = nil
  @keywords = nil
  @block_arg = nil
  @splat_index = nil
  @block_index = nil
  @locals = []
  @local_index = 0

  names = []

  process_fixed_arguments Array(required), @required = [], names

  if optional
    @defaults = DefaultArguments.new line, optional
    @optional = @defaults.names
    names.concat @optional
    @locals.concat @defaults.arguments
  else
    @optional = []
  end

  case splat
  when Symbol
    names << splat
    @locals << splat
  when true
    splat = :*
    @locals << splat
  when false
    splat = nil
    @splat_index = -3
  end

  @splat = splat

  process_fixed_arguments post, @post = [], names

  if kwargs || kwrest
    placeholder_var = local_placeholder
    @locals << placeholder_var
  end

  kwrest = placeholder_var if kwrest == true

  if kwargs
    @keywords = KeywordParameters.new line, kwargs, kwrest
    names.concat @keywords.names
  elsif kwrest
    @keywords = KeywordParameters.new line, nil, kwrest
  end

  @keywords.value = LocalVariableAccess.new line, placeholder_var if @keywords

  @names = names

  self.block_arg = block
end

Instance Attribute Details

#block_arg ⇒ Object

Returns the value of attribute block_arg.



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# File 'lib/rubinius/code/ast/definitions.rb', line 305

def block_arg
  @block_arg
end

#block_index ⇒ Object (readonly)

Returns the value of attribute block_index.



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# File 'lib/rubinius/code/ast/definitions.rb', line 305

def block_index
  @block_index
end

#defaults ⇒ Object

Returns the value of attribute defaults.



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# File 'lib/rubinius/code/ast/definitions.rb', line 303

def defaults
  @defaults
end

#keywords ⇒ Object

Returns the value of attribute keywords.



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# File 'lib/rubinius/code/ast/definitions.rb', line 303

def keywords
  @keywords
end

#kwrest ⇒ Object

Returns the value of attribute kwrest.



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# File 'lib/rubinius/code/ast/definitions.rb', line 303

def kwrest
  @kwrest
end

#names ⇒ Object

Returns the value of attribute names.



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# File 'lib/rubinius/code/ast/definitions.rb', line 303

def names
  @names
end

#optional ⇒ Object

Returns the value of attribute optional.



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# File 'lib/rubinius/code/ast/definitions.rb', line 303

def optional
  @optional
end

#post ⇒ Object

Returns the value of attribute post.



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# File 'lib/rubinius/code/ast/definitions.rb', line 303

def post
  @post
end

#required ⇒ Object

Returns the value of attribute required.



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# File 'lib/rubinius/code/ast/definitions.rb', line 303

def required
  @required
end

#splat ⇒ Object

Returns the value of attribute splat.



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# File 'lib/rubinius/code/ast/definitions.rb', line 303

def splat
  @splat
end

Instance Method Details

#arity ⇒ Object 



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# File 'lib/rubinius/code/ast/definitions.rb', line 437

def arity
  arity = required_args

  if @keywords and @keywords.required?
    arity += 1
  end

  if @splat or not @optional.empty? or
      (@keywords and not @keywords.required?)
    arity += 1
  end

  if @splat or not @optional.empty? or
      (@keywords and not @keywords.required?)
    arity = -arity
  end

  arity
end

#bytecode(g) ⇒ Object 



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# File 'lib/rubinius/code/ast/definitions.rb', line 474

def bytecode(g)
  g.state.check_for_locals = false
  map_arguments g.state.scope

  @required.each_with_index do |arg, index|
    if arg.kind_of? MultipleAssignment
      g.push_local index
      arg.bytecode(g)
      g.pop
    end
  end

  @defaults.bytecode(g) if @defaults

  index = @required.size + @optional.size
  index += 1 if @splat_index

  @post.each do |arg|
    if arg.kind_of? MultipleAssignment
      g.push_local index
      index += 1
      arg.bytecode(g)
      g.pop
    end
  end

  @keywords.bytecode(g) if @keywords

  @block_arg.bytecode(g) if @block_arg

  g.state.check_for_locals = true
end

#local_placeholder ⇒ Object 



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# File 'lib/rubinius/code/ast/definitions.rb', line 392

def local_placeholder
  :"_:#{@local_index += 1}"
end

#map_arguments(scope) ⇒ Object 



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# File 'lib/rubinius/code/ast/definitions.rb', line 457

def map_arguments(scope)
  @locals.map do |v|
    case v
    when Symbol
      scope.new_local v
    when MultipleAssignment
      scope.assign_local_reference v.right
    when LocalVariable
      scope.assign_local_reference v
    when nil
      STDERR.puts @locals.inspect, self.inspect
    end
  end

  @keywords.map_arguments(scope) if @keywords
end

#post_args ⇒ Object 



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# File 'lib/rubinius/code/ast/definitions.rb', line 421

def post_args
  @post.size
end

#process_fixed_arguments(array, arguments, names) ⇒ Object 



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# File 'lib/rubinius/code/ast/definitions.rb', line 368

def process_fixed_arguments(array, arguments, names)
  if array
    array.each do |arg|
      case arg
      when :_
        var = names.include?(:_) ? local_placeholder : arg
        names << arg
      when Symbol
        var = arg
        names << arg
      when MultipleAssignment
        var = arg
        var.right = LocalVariableAccess.new line, local_placeholder
      when VariableAssignment
        var = arg
        names << var.name
      end

      arguments << var
      @locals << var
    end
  end
end

#required_args ⇒ Object 



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# File 'lib/rubinius/code/ast/definitions.rb', line 417

def required_args
  @required.size + @post.size
end

#splat_index ⇒ Object 



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# File 'lib/rubinius/code/ast/definitions.rb', line 431

def splat_index
  return @splat_index if @splat_index

  return @required.size + @optional.size if @splat
end

#to_sexp ⇒ Object 



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# File 'lib/rubinius/code/ast/definitions.rb', line 507

def to_sexp
  sexp = [:args]

  @required.each do |a|
    case a
    when Symbol
      sexp << a
    when Node
      sexp << a.to_sexp
    end
  end

  sexp += @defaults.names if @defaults

  if @splat == :*
    sexp << :*
  elsif @splat
    sexp << :"*#{@splat}"
  end

  if @post
    @post.each do |a|
      case a
      when Symbol
        sexp << a
      when Node
        sexp << a.to_sexp
      end
    end
  end

  sexp += @keywords.names if @keywords

  sexp << :"&#{@block_arg.name}" if @block_arg

  sexp << [:block] + @defaults.to_sexp if @defaults
  sexp << @keywords.to_sexp if @keywords

  sexp
end

#total_args ⇒ Object 



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# File 'lib/rubinius/code/ast/definitions.rb', line 425

def total_args
  args = @required.size + @optional.size + @post.size
  args += 1 if @keywords
  args
end