Class: Rubinius::AST::MultipleAssignment

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

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, node_name, #pos, #set_child, transform, #transform, transform_comment, transform_kind, transform_kind=, transform_name, #visit, #walk

Constructor Details

#initialize(line, left, right, splat) ⇒ MultipleAssignment

Returns a new instance of MultipleAssignment.



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# File 'lib/compiler/ast/variables.rb', line 233

def initialize(line, left, right, splat)
  @line = line
  @left = left
  @right = right
  @splat = nil
  @block = nil # support for |&b|
  @post = nil # in `a,*b,c`, c is in post.

  if Rubinius.ruby18?
    @fixed = right.kind_of?(ArrayLiteral) ? true : false
  elsif splat.kind_of?(PostArg)
    @fixed = false
    @post = splat.rest
    splat = splat.into
  elsif right.kind_of?(ArrayLiteral)
    @fixed = right.body.size > 1
  else
    @fixed = false
  end

  if splat.kind_of? Node
    if @left
      if right
        @splat = SplatAssignment.new line, splat
      else
        @splat = SplatWrapped.new line, splat
      end
    elsif @fixed
      @splat = SplatArray.new line, splat, right.body.size
    elsif right.kind_of? SplatValue
      @splat = splat
    else
      @splat = SplatWrapped.new line, splat
    end
  elsif splat
    # We need a node for eg { |*| } and { |a, *| }
    size = @fixed ? right.body.size : 0
    @splat = EmptySplat.new line, size
  end
end

Instance Attribute Details

#block ⇒ Object

Returns the value of attribute block.



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# File 'lib/compiler/ast/variables.rb', line 231

def block
  @block
end

#left ⇒ Object

Returns the value of attribute left.



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# File 'lib/compiler/ast/variables.rb', line 231

def left
  @left
end

#right ⇒ Object

Returns the value of attribute right.



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# File 'lib/compiler/ast/variables.rb', line 231

def right
  @right
end

#splat ⇒ Object

Returns the value of attribute splat.



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# File 'lib/compiler/ast/variables.rb', line 231

def splat
  @splat
end

Instance Method Details

#declare_local_scope(scope) ⇒ Object 



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# File 'lib/compiler/ast/variables.rb', line 305

def declare_local_scope(scope)
  # Fix the scope for locals introduced by the left. We
  # do this before running the code for the right so that
  # right side sees the proper scoping of the locals on the left.

  if @left
    @left.body.each do |var|
      case var
      when LocalVariable
        scope.assign_local_reference var
      when MultipleAssignment
        var.declare_local_scope(scope)
      end
    end
  end

  if @splat and @splat.kind_of?(SplatAssignment)
    if @splat.value.kind_of?(LocalVariable)
      scope.assign_local_reference @splat.value
    end
  end
end

#iter_arguments ⇒ Object 



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# File 'lib/compiler/ast/variables.rb', line 301

def iter_arguments
  @iter_arguments = true
end

#make_array(g) ⇒ Object 



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# File 'lib/compiler/ast/variables.rb', line 287

def make_array(g)
  size = @right.body.size - @left.body.size
  g.make_array size if size >= 0
end

#pad_short(g) ⇒ Object 



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# File 'lib/compiler/ast/variables.rb', line 274

def pad_short(g)
  short = @left.body.size - @right.body.size
  if short > 0
    short.times { g.push :nil }
    g.make_array 0 if @splat
  end
end

#pop_excess(g) ⇒ Object 



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# File 'lib/compiler/ast/variables.rb', line 282

def pop_excess(g)
  excess = @right.body.size - @left.body.size
  excess.times { g.pop } if excess > 0
end

#rotate(g) ⇒ Object 



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# File 'lib/compiler/ast/variables.rb', line 292

def rotate(g)
  if @splat
    size = @left.body.size + 1
  else
    size = @right.body.size
  end
  g.rotate size
end

#to_sexp ⇒ Object 



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# File 'lib/compiler/ast/variables.rb', line 328

def to_sexp
  left = @left ? @left.to_sexp : [:array]
  left << [:splat, @splat.to_sexp] if @splat
  left << @block.to_sexp if @block

  sexp = [:masgn, left]
  sexp << @right.to_sexp if @right
  sexp
end