Module: UnifiedRuby

Included in:
Doppelganger::Extractor, PostUnifier
Defined in:
lib/doppelganger/unified_ruby.rb

Instance Method Summary collapse

Instance Method Details

#process(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 9

def process exp
  exp = Sexp.from_array exp unless Sexp === exp or exp.nil?
  super
end

#rewrite_argscat(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 14

def rewrite_argscat exp
  _, ary, val = exp
  ary = s(:array, ary) unless ary.first == :array
  ary << s(:splat, val)
end

#rewrite_argspush(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 20

def rewrite_argspush exp
  exp[0] = :arglist
  exp
end

#rewrite_attrasgn(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 25

def rewrite_attrasgn(exp)
  last = exp.last

  if Sexp === last then
    last[0] = :arglist if last[0] == :array
  else
    exp << s(:arglist)
  end

  exp
end

#rewrite_begin(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 37

def rewrite_begin(exp)
  if exp.size > 2
    exp
  else
    exp.last
  end
end

#rewrite_block_pass(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 45

def rewrite_block_pass exp
  if exp.size == 3 then
    _, block, recv = exp
    case recv.first
    when :super then
      recv << s(:block_pass, block)
      exp = recv
    when :call then
      recv.last << s(:block_pass, block)
      exp = recv
    else
      exp
    end
  end

  exp
end

#rewrite_bmethod(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 63

def rewrite_bmethod(exp)
  _, args, body = exp

  args ||= s(:array)
  body ||= s(:block)

  args = s(:args, args) unless args[0] == :array

  args = args[1] if args[1] && args[1][0] == :masgn # TODO: clean up
  args = args[1] if args[1] && args[1][0] == :array
  args[0] = :args

  # this is ugly because rewriters are depth first.
  # TODO: maybe we could come up with some way to do both forms of rewriting.
  args.map! { |s|
    if Sexp === s
      case s[0]
      when :lasgn then
        s[1]
      when :splat then
        :"*#{s[1][1]}"
      else
        raise "huh?: #{s.inspect}"
      end
    else
      s
    end
  }

  body = s(:block, body) unless body[0] == :block
  body.insert 1, args

  s(:scope, body)
end

#rewrite_call(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 98

def rewrite_call(exp)
  args = exp.last
  case args
  when nil
    exp.pop
  when Array
    case args.first
    when :array, :arglist then
      args[0] = :arglist
    when :argscat, :splat then
      exp[-1] = s(:arglist, args)
    else
      raise "unknown type in call #{args.first.inspect} in #{exp.inspect}"
    end
    return exp
  end

  exp << s(:arglist)

  exp
end

#rewrite_dasgn(exp) ⇒ Object Also known as: rewrite_dasgn_curr 



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# File 'lib/doppelganger/unified_ruby.rb', line 120

def rewrite_dasgn(exp)
  exp[0] = :lasgn
  exp
end

#rewrite_defn(exp) ⇒ Object

:defn is one of the most complex of all the ASTs in ruby. We do one of 3 different translations:

1) From:

s(:defn, :name, s(:scope, s(:block, s(:args, ...), ...)))
s(:defn, :name, s(:bmethod, s(:masgn, s(:dasgn_curr, :args)), s(:block, ...)))
s(:defn, :name, s(:fbody, s(:bmethod, s(:masgn, s(:dasgn_curr, :splat)), s(:block, ...))))

to:

s(:defn, :name, s(:args, ...), s(:scope, s:(block, ...)))

2) From:

s(:defn, :writer=, s(:attrset, :@name))

to:

s(:defn, :writer=, s(:args), s(:attrset, :@name))

3) From:

s(:defn, :reader, s(:ivar, :@name))

to:

s(:defn, :reader, s(:args), s(:ivar, :@name))



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# File 'lib/doppelganger/unified_ruby.rb', line 158

def rewrite_defn(exp)
  weirdo = exp.ivar || exp.attrset
  fbody  = exp.fbody(true)

  weirdo ||= fbody.cfunc if fbody

  exp.push(fbody.scope) if fbody unless weirdo

  args = exp.scope.block.args(true) unless weirdo
  exp.insert 2, args if args

  # move block_arg up and in
  block_arg = exp.scope.block.block_arg(true) rescue nil
  if block_arg
    block = args.block(true)
    args << :"&#{block_arg.last}"
    args << block if block
  end

  # patch up attr_accessor methods
  if weirdo then
    case
    when fbody && fbody.cfunc then
      exp.insert 2, s(:args, :"*args")
    when exp.ivar then
      exp.insert 2, s(:args)
    when exp.attrset then
      exp.insert 2, s(:args, :arg)
    else
      raise "unknown wierdo: #{wierdo.inpsect}"
    end
  end

  exp
end

#rewrite_defs(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 194

def rewrite_defs(exp)
  receiver = exp.delete_at 1

  # TODO: I think this would be better as rewrite_scope, but that breaks others
  exp = s(exp.shift, exp.shift,
          s(:scope,
            s(:block, exp.scope.args))) if exp.scope && exp.scope.args

  result = rewrite_defn(exp)
  result.insert 1, receiver

  result
end

#rewrite_dmethod(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 208

def rewrite_dmethod(exp)
  exp.shift # type
  exp.shift # dmethod name
  exp.shift # scope / block / body
end

#rewrite_dvar(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 214

def rewrite_dvar(exp)
  exp[0] = :lvar
  exp
end

#rewrite_fcall(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 219

def rewrite_fcall(exp)
  exp[0] = :call
  exp.insert 1, nil

  rewrite_call(exp)
end

#rewrite_op_asgn1(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 226

def rewrite_op_asgn1(exp)
  exp[2][0] = :arglist # if exp[2][0] == :array
  exp
end

#rewrite_resbody(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 231

def rewrite_resbody(exp)
  exp[1] ||= s(:array)        # no args

  body = exp[2]
  if body then
    case body.first
    when :lasgn, :iasgn then
      exp[1] << exp.delete_at(2) if body[-1] == s(:gvar, :$!)
    when :block then
      exp[1] << body.delete_at(1) if [:lasgn, :iasgn].include?(body[1][0]) &&
        body[1][-1] == s(:gvar, :$!)
    end
  end

  exp << nil if exp.size == 2 # no body

  exp
end

#rewrite_rescue(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 250

def rewrite_rescue(exp)
  # SKETCHY HACK return exp if exp.size > 4
  ignored = exp.shift
  body    = exp.shift unless exp.first.first == :resbody
  resbody = exp.shift
  els     = exp.shift unless exp.first.first == :resbody unless exp.empty?
  rest    = exp.empty? ? nil : exp # graceful re-rewriting (see rewrite_begin)

  resbodies = []

  unless rest then
    while resbody do
      resbodies << resbody
      resbody = resbody.resbody(true)
    end

    resbodies.each do |resbody|
      if resbody[2] && resbody[2][0] == :block && resbody[2].size == 2 then
        resbody[2] = resbody[2][-1]
      end
    end
  else
    resbodies = [resbody] + rest
  end

  resbodies << els if els

  s(:rescue, body, *resbodies).compact
end

#rewrite_splat(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 280

def rewrite_splat(exp)
  good = [:arglist, :argspush, :array, :svalue, :yield, :super].include? context.first
  exp = s(:array, exp) unless good
  exp
end

#rewrite_super(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 286

def rewrite_super(exp)
  return exp if exp.structure.flatten.first(3) == [:super, :array, :splat]
  exp.push(*exp.pop[1..-1]) if exp.size == 2 && exp.last.first == :array
  exp
end

#rewrite_vcall(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 292

def rewrite_vcall(exp)
  exp.push nil
  rewrite_fcall(exp)
end

#rewrite_yield(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 297

def rewrite_yield(exp)
  real_array = exp.pop if exp.size == 3

  if exp.size == 2 then
    if real_array then
      exp[-1] = s(:array, exp[-1]) if exp[-1][0] != :array
    else
      exp.push(*exp.pop[1..-1]) if exp.last.first == :array
    end
  end

  exp
end

#rewrite_zarray(exp) ⇒ Object 



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# File 'lib/doppelganger/unified_ruby.rb', line 311

def rewrite_zarray(exp)
  exp[0] = :array
  exp
end