Class: Proc

Inherits:
Object show all
Defined in:
lib/decompiler/proc/as_code.rb,
lib/decompiler/proc/signature.rb,
lib/decompiler/proc/as_expression.rb

Defined Under Namespace

Classes: Arguments, Signature

Instance Method Summary collapse

Instance Method Details

#argument_info ⇒ Object

Return a hash mapping each argument name to a description of that argument.



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# File 'lib/decompiler/proc/signature.rb', line 133

def argument_info
  args = self.arguments()

  info = {}
  args.each do |name|
    info[name] = name.to_s
  end

  # Rest arg
  if args.rest_arg then
    rest_name = args[args.rest_arg]
    if rest_name then
      info[rest_name] = "*#{rest_name}"
    end
  end

  return info
end

#arguments ⇒ Object

Return an Arguments object representing the arguments in the order in which they appear in the argument list.



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# File 'lib/decompiler/proc/signature.rb', line 66

def arguments
  has_rest_arg = self.has_rest_arg

  if self.respond_to?(:var) then
    # pre-YARV
    case self.var
    when Node::DASGN_CURR
      return Arguments.new([ self.var.vid ], false, has_rest_arg ? 0 : nil)
    when Node::MASGN
      if self.var.head then
        a = self.var.head.to_a
        args = a.map { |n| n.vid }
      else
        args = []
      end
      if self.var.args then
        args.push(self.var.args.vid)
      end
      return Arguments.new(args, true, has_rest_arg ? args.size - 1: nil)
    when nil
      return Arguments.new(nil, false, has_rest_arg ? 0 : nil)
    when Fixnum
      return Arguments.new([], false, has_rest_arg ? 0 : nil)
    else
      raise "Unexpected node type: #{self.var.class}"
    end
  elsif
    # YARV
    iseq = self.body
    local_vars = iseq.local_table
    has_rest_arg = iseq.arg_rest != -1
    has_block_arg = iseq.arg_block != -1
    num_args = \
      iseq.argc + \
      iseq.arg_opt_table.size + \
      (has_rest_arg ? 1 : 0) + \
      (has_block_arg ? 1 : 0)
    names = local_vars[0...num_args]
    # TODO: masgn
    return Arguments.new(names, true, has_rest_arg ? -1 : nil)
  else
    return Arguments.new(nil, false, nil)
  end
end

#as_code(indent = 0) ⇒ Object

Return a string representation of a proc’s definition/body, similarly to Method#as_code.



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# File 'lib/decompiler/proc/as_code.rb', line 9

def as_code(indent=0)
  sig = self.signature
  body_expression = self.body ? self.body.as_code(indent+1) : nil
  s = "#{'  '*indent}proc do"
  if not sig.args.unspecified then
    s += " #{sig}"
  end
  s += "\n"
  if body_expression then
    s += "#{body_expression}\n"
  end
  s += "#{'  '*indent}end"
  return s
end

#as_expression ⇒ Object

Return a single-line string representation of a proc’s definition/body, similarly to Method#as_expression.



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# File 'lib/decompiler/proc/as_expression.rb', line 9

def as_expression
  sig = self.signature
  body_expression = self.body ? self.body.as_expression : nil
  s = sig.args.unspecified ? "" : sig.to_s + ' '
  b = body_expression ? body_expression + ' ' : ''
  return "proc { #{s}#{b}}"
end

#has_rest_arg ⇒ Object

Return true if the proc has a rest arg



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# File 'lib/decompiler/proc/signature.rb', line 112

def has_rest_arg
  if self.respond_to?(:var) then
    # pre-YARV
    has_rest_arg = false
    if self.var then
      if self.var.class == Node::MASGN then
        if self.var.args then
          has_rest_arg = true
        end
      end
    end
  else
    # YARV
    rest = self.body.arg_rest
    has_rest_arg = (rest >= 0 ? rest - 1 : nil)
  end
  return has_rest_arg
end

#signature ⇒ Object

Return a String representing the method’s signature.



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# File 'lib/decompiler/proc/signature.rb', line 178

def signature
  return Signature.new(
      arguments(),
      argument_info)
end