Class: Ruby2Ruby

Inherits:
SexpProcessor
  • Object
show all
Defined in:
lib/ruby2ruby.rb

Constant Summary collapse

VERSION = 
'1.2.0'
LINE_LENGTH = 
78
ASSIGN_NODES =

Nodes that represent assignment and probably need () around them.

[
 :dasgn,
 :flip2,
 :flip3,
 :lasgn,
 :masgn,
 :attrasgn,
 :op_asgn1,
 :op_asgn2,
 :op_asgn_and,
 :op_asgn_or,
 :return,
]

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Ruby2Ruby

Returns a new instance of Ruby2Ruby.



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# File 'lib/ruby2ruby.rb', line 35

def initialize
  super
  @indent = "  "
  self.auto_shift_type = true
  self.strict = true
  self.expected = String

  # self.debug[:defn] = /zsuper/
end

Class Method Details

.translate(klass_or_str, method = nil) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 28

def self.translate(klass_or_str, method = nil)
  require 'parse_tree'
  sexp = ParseTree.translate(klass_or_str, method)
  sexp = Unifier.new.process(sexp)
  self.new.process(sexp)
end

Instance Method Details

#cond_loop(exp, name) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 805

def cond_loop(exp, name)
  cond = process(exp.shift)
  body = process(exp.shift)
  head_controlled = exp.shift

  body = indent(body).chomp if body

  code = []
  if head_controlled then
    code << "#{name} #{cond} do"
    code << body if body
    code << "end"
  else
    code << "begin"
    code << body if body
    code << "end #{name} #{cond}"
  end
  code.join("\n")
end

#indent(s) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 930

def indent(s)
  s.to_s.split(/\n/).map{|line| @indent + line}.join("\n")
end

#process_alias(exp) ⇒ Object

Processors



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# File 'lib/ruby2ruby.rb', line 48

def process_alias(exp)
  "alias_method #{process(exp.shift)}, #{process(exp.shift)}"
end

#process_and(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 52

def process_and(exp)
  "(#{process exp.shift} and #{process exp.shift})"
end

#process_arglist(exp) ⇒ Object

custom made node



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# File 'lib/ruby2ruby.rb', line 56

def process_arglist(exp) # custom made node
  code = []
  until exp.empty? do
    code << process(exp.shift)
  end
  code.join ', '
end

#process_args(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 64

def process_args(exp)
  args = []

  until exp.empty? do
    arg = exp.shift
    case arg
    when Symbol then
      args << arg
    when Array then
      case arg.first
      when :block then
        asgns = {}
        arg[1..-1].each do |lasgn|
          asgns[lasgn[1]] = process(lasgn)
        end

        args.each_with_index do |name, index|
          args[index] = asgns[name] if asgns.has_key? name
        end
      else
        raise "unknown arg type #{arg.first.inspect}"
      end
    else
      raise "unknown arg type #{arg.inspect}"
    end
  end

  return "(#{args.join ', '})"
end

#process_array(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 94

def process_array(exp)
  "[#{process_arglist(exp)}]"
end

#process_attrasgn(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 98

def process_attrasgn(exp)
  receiver = process exp.shift
  name = exp.shift
  args = exp.empty? ? nil : exp.shift

  case name
  when :[]= then
    rhs = process args.pop
    "#{receiver}[#{process(args)}] = #{rhs}"
  else
    name = name.to_s.sub(/=$/, '')
    if args && args != s(:arglist) then
      "#{receiver}.#{name} = #{process(args)}"
    end
  end
end

#process_back_ref(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 115

def process_back_ref(exp)
  "$#{exp.shift}"
end

#process_begin(exp) ⇒ Object

TODO: figure out how to do rescue and ensure ENTIRELY w/o begin



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# File 'lib/ruby2ruby.rb', line 120

def process_begin(exp)
  code = []
  code << "begin"
  until exp.empty?
    src = process(exp.shift)
    src = indent(src) unless src =~ /(^|\n)rescue/ # ensure no level 0 rescues
    code << src
  end
  code << "end"
  return code.join("\n")
end

#process_block(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 132

def process_block(exp)
  result = []

  exp << nil if exp.empty?
  until exp.empty? do
    code = exp.shift
    if code.nil? or code.first == :nil then
      result << "# do nothing"
    else
      result << process(code)
    end
  end

  result = result.join "\n"

  result = case self.context[1]
           when nil, :scope, :if, :iter, :resbody, :when, :while then
             result + "\n"
           else
             "(#{result})"
           end

  return result
end

#process_block_pass(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 157

def process_block_pass exp
  raise "huh?: #{exp.inspect}" if exp.size > 1

  "&#{process exp.shift}"
end

#process_break(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 163

def process_break(exp)
  val = exp.empty? ? nil : process(exp.shift)
  # HACK "break" + (val ? " #{val}" : "")
  if val then
    "break #{val}"
  else
    "break"
  end
end

#process_call(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 173

def process_call(exp)
  receiver_node_type = exp.first.nil? ? nil : exp.first.first
  receiver = process exp.shift

  receiver = "(#{receiver})" if
    Ruby2Ruby::ASSIGN_NODES.include? receiver_node_type

  name = exp.shift
  args_exp = exp.shift rescue nil
  if args_exp && args_exp.first == :array # FIX
    args = "#{process(args_exp)[1..-2]}"
  else
    args = process args_exp
    args = nil if args.empty?
  end

  case name
  when :<=>, :==, :<, :>, :<=, :>=, :-, :+, :*, :/, :%, :<<, :>>, :** then
    "(#{receiver} #{name} #{args})"
  when :[] then
    "#{receiver}[#{args}]"
  when :"-@" then
    "-#{receiver}"
  when :"+@" then
    "+#{receiver}"
  else
    unless receiver.nil? then
      "#{receiver}.#{name}#{args ? "(#{args})" : args}"
    else
      "#{name}#{args ? "(#{args})" : args}"
    end
  end
end

#process_case(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 207

def process_case(exp)
  result = []
  expr = process exp.shift
  if expr then
    result << "case #{expr}"
  else
    result << "case"
  end
  until exp.empty?
    pt = exp.shift
    if pt and pt.first == :when
      result << "#{process(pt)}"
    else
      code = indent(process(pt))
      code = indent("# do nothing") if code =~ /^\s*$/
      result << "else\n#{code}"
    end
  end
  result << "end"
  result.join("\n")
end

#process_cdecl(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 229

def process_cdecl(exp)
  lhs = exp.shift
  lhs = process lhs if Sexp === lhs
  unless exp.empty? then
    rhs = process(exp.shift)
    "#{lhs} = #{rhs}"
  else
    lhs.to_s
  end
end

#process_class(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 240

def process_class(exp)
  "class #{util_module_or_class(exp, true)}"
end

#process_colon2(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 244

def process_colon2(exp)
  "#{process(exp.shift)}::#{exp.shift}"
end

#process_colon3(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 248

def process_colon3(exp)
  "::#{exp.shift}"
end

#process_const(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 252

def process_const(exp)
  exp.shift.to_s
end

#process_cvar(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 256

def process_cvar(exp)
  "#{exp.shift}"
end

#process_cvasgn(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 260

def process_cvasgn(exp)
  "#{exp.shift} = #{process(exp.shift)}"
end

#process_cvdecl(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 264

def process_cvdecl(exp)
  "#{exp.shift} = #{process(exp.shift)}"
end

#process_defined(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 268

def process_defined(exp)
  "defined? #{process(exp.shift)}"
end

#process_defn(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 272

def process_defn(exp)
  type1 = exp[1].first
  type2 = exp[2].first rescue nil

  if type1 == :args and [:ivar, :attrset].include? type2 then
    name = exp.shift
    case type2
    when :ivar then
      exp.clear
      return "attr_reader #{name.inspect}"
    when :attrset then
      exp.clear
      return "attr_writer :#{name.to_s[0..-2]}"
    else
      raise "Unknown defn type: #{exp.inspect}"
    end
  end

  case type1
  when :scope, :args then
    name = exp.shift
    args = process(exp.shift)
    args = "" if args == "()"
    body = indent(process(exp.shift))
    return "def #{name}#{args}\n#{body}\nend".gsub(/\n\s*\n+/, "\n")
  else
    raise "Unknown defn type: #{type1} for #{exp.inspect}"
  end
end

#process_defs(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 302

def process_defs(exp)
  lhs  = exp.shift
  var = [:self, :cvar, :dvar, :ivar, :gvar, :lvar].include? lhs.first
  name = exp.shift

  lhs = process(lhs)
  lhs = "(#{lhs})" unless var

  exp.unshift "#{lhs}.#{name}"
  process_defn(exp)
end

#process_dot2(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 314

def process_dot2(exp)
  "(#{process exp.shift}..#{process exp.shift})"
end

#process_dot3(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 318

def process_dot3(exp)
  "(#{process exp.shift}...#{process exp.shift})"
end

#process_dregx(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 322

def process_dregx(exp)
  "/" << util_dthing(exp, true) << "/"
end

#process_dregx_once(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 326

def process_dregx_once(exp)
  process_dregx(exp) + "o"
end

#process_dstr(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 330

def process_dstr(exp)
  "\"#{util_dthing(exp)}\""
end

#process_dsym(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 334

def process_dsym(exp)
  ":#{process_dstr(exp)}"
end

#process_dxstr(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 338

def process_dxstr(exp)
  "`#{process_dstr(exp)[1..-2]}`"
end

#process_ensure(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 342

def process_ensure(exp)
  body = process exp.shift
  ens  = exp.shift
  ens  = nil if ens == s(:nil)
  ens  = process(ens) || "# do nothing"

  body.sub!(/\n\s*end\z/, '')

  return "#{body}\nensure\n#{indent ens}"
end

#process_evstr(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 353

def process_evstr(exp)
  exp.empty? ? '' : process(exp.shift)
end

#process_false(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 357

def process_false(exp)
  "false"
end

#process_flip2(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 361

def process_flip2(exp)
  "#{process(exp.shift)}..#{process(exp.shift)}"
end

#process_flip3(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 365

def process_flip3(exp)
  "#{process(exp.shift)}...#{process(exp.shift)}"
end

#process_for(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 369

def process_for(exp)
  recv = process exp.shift
  iter = process exp.shift
  body = exp.empty? ? nil : process(exp.shift)

  result = ["for #{iter} in #{recv} do"]
  result << indent(body ? body : "# do nothing")
  result << "end"

  result.join("\n")
end

#process_gasgn(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 381

def process_gasgn(exp)
  process_iasgn(exp)
end

#process_gvar(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 385

def process_gvar(exp)
  return exp.shift.to_s
end

#process_hash(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 389

def process_hash(exp)
  result = []
  until exp.empty?
    lhs = process(exp.shift)
    rhs = exp.shift
    t = rhs.first
    rhs = process rhs
    rhs = "(#{rhs})" unless [:lit, :str].include? t # TODO: verify better!

    result << "#{lhs} => #{rhs}"
  end

  case self.context[1]
  when :arglist, :argscat then
    return "#{result.join(', ')}" # HACK - this will break w/ 2 hashes as args
  else
    return "{ #{result.join(', ')} }"
  end
end

#process_iasgn(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 409

def process_iasgn(exp)
  lhs = exp.shift
  if exp.empty? then # part of an masgn
    lhs.to_s
  else
    "#{lhs} = #{process exp.shift}"
  end
end

#process_if(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 418

def process_if(exp)
  expand = Ruby2Ruby::ASSIGN_NODES.include? exp.first.first
  c = process exp.shift
  t = process exp.shift
  f = process exp.shift

  c = "(#{c.chomp})" if c =~ /\n/

  if t then
    unless expand then
      if f then
        r = "#{c} ? (#{t}) : (#{f})"
        r = nil if r =~ /return/ # HACK - need contextual awareness or something
      else
        r = "#{t} if #{c}"
      end
      return r if r and (@indent+r).size < LINE_LENGTH and r !~ /\n/
    end

    r = "if #{c} then\n#{indent(t)}\n"
    r << "else\n#{indent(f)}\n" if f
    r << "end"

    r
  else
    unless expand then
      r = "#{f} unless #{c}"
      return r if (@indent+r).size < LINE_LENGTH and r !~ /\n/
    end
    "unless #{c} then\n#{indent(f)}\nend"
  end
end

#process_iter(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 451

def process_iter(exp)
  iter = process exp.shift
  args = exp.shift
  args = (args == 0) ? '' : process(args)
  body = exp.empty? ? nil : process(exp.shift)

  b, e = if iter == "END" then
           [ "{", "}" ]
         else
           [ "do", "end" ]
         end

  iter.sub!(/\(\)$/, '')

  # REFACTOR: ugh
  result = []
  result << "#{iter} {"
  result << " |#{args}|" if args
  if body then
    result << " #{body.strip} "
  else
    result << ' '
  end
  result << "}"
  result = result.join
  return result if result !~ /\n/ and result.size < LINE_LENGTH

  result = []
  result << "#{iter} #{b}"
  result << " |#{args}|" if args
  result << "\n"
  result << indent(body.strip)
  result << "\n"
  result << e
  result.join
end

#process_ivar(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 488

def process_ivar(exp)
  exp.shift.to_s
end

#process_lasgn(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 492

def process_lasgn(exp)
  s = "#{exp.shift}"
  s += " = #{process exp.shift}" unless exp.empty?
  s
end

#process_lit(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 498

def process_lit(exp)
  obj = exp.shift
  case obj
  when Range then
    "(#{obj.inspect})"
  else
    obj.inspect
  end
end

#process_lvar(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 508

def process_lvar(exp)
  exp.shift.to_s
end

#process_masgn(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 516

def process_masgn(exp)
  lhs = exp.shift
  rhs = exp.empty? ? nil : exp.shift

  unless exp.empty? then
    rhs[1] = splat(rhs[1]) unless rhs == s(:splat)
    lhs << rhs
    rhs = exp.shift
  end

  case lhs.first
  when :array then
    lhs.shift
    lhs = lhs.map do |l|
      case l.first
      when :masgn then
        "(#{process(l)})"
      else
        process(l)
      end
    end
  when :lasgn then
    lhs = [ splat(lhs.last) ]
  when :splat then
    lhs = [ :"*" ]
  else
    raise "no clue: #{lhs.inspect}"
  end

  if context[1] == :iter and rhs then
    lhs << splat(rhs[1])
    rhs = nil
  end

  unless rhs.nil? then
    t = rhs.first
    rhs = process rhs
    rhs = rhs[1..-2] if t != :to_ary
    return "#{lhs.join(", ")} = #{rhs}"
  else
    return lhs.join(", ")
  end

end

#process_match(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 561

def process_match(exp)
  "#{process(exp.shift)}"
end

#process_match2(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 565

def process_match2(exp)
  lhs = process(exp.shift)
  rhs = process(exp.shift)
  "#{lhs} =~ #{rhs}"
end

#process_match3(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 571

def process_match3(exp)
  rhs = process(exp.shift)
  lhs = process(exp.shift)
  "#{lhs} =~ #{rhs}"
end

#process_module(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 577

def process_module(exp)
  "module #{util_module_or_class(exp)}"
end

#process_next(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 581

def process_next(exp)
  val = exp.empty? ? nil : process(exp.shift)
  if val then
    "next #{val}"
  else
    "next"
  end
end

#process_nil(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 590

def process_nil(exp)
  "nil"
end

#process_not(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 594

def process_not(exp)
  "(not #{process exp.shift})"
end

#process_nth_ref(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 598

def process_nth_ref(exp)
  "$#{exp.shift}"
end

#process_op_asgn1(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 602

def process_op_asgn1(exp)
  # [[:lvar, :b], [:arglist, [:lit, 1]], :"||", [:lit, 10]]
  lhs = process(exp.shift)
  index = process(exp.shift)
  msg = exp.shift
  rhs = process(exp.shift)

  "#{lhs}[#{index}] #{msg}= #{rhs}"
end

#process_op_asgn2(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 612

def process_op_asgn2(exp)
  # [[:lvar, :c], :var=, :"||", [:lit, 20]]
  lhs = process(exp.shift)
  index = exp.shift.to_s[0..-2]
  msg = exp.shift

  rhs = process(exp.shift)

  "#{lhs}.#{index} #{msg}= #{rhs}"
end

#process_op_asgn_and(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 623

def process_op_asgn_and(exp)
  # a &&= 1
  # [[:lvar, :a], [:lasgn, :a, [:lit, 1]]]
  exp.shift
  process(exp.shift).sub(/\=/, '&&=')
end

#process_op_asgn_or(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 630

def process_op_asgn_or(exp)
  # a ||= 1
  # [[:lvar, :a], [:lasgn, :a, [:lit, 1]]]
  exp.shift
  process(exp.shift).sub(/\=/, '||=')
end

#process_or(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 637

def process_or(exp)
  "(#{process exp.shift} or #{process exp.shift})"
end

#process_postexe(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 641

def process_postexe(exp)
  "END"
end

#process_redo(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 645

def process_redo(exp)
  "redo"
end

#process_resbody(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 649

def process_resbody exp
  args = exp.shift
  body = process(exp.shift) || "# do nothing"

  name =   args.lasgn true
  name ||= args.iasgn true
  args = process(args)[1..-2]
  args = " #{args}" unless args.empty?
  args += " => #{name[1]}" if name

  "rescue#{args}\n#{indent body}"
end

#process_rescue(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 662

def process_rescue exp
  body = process(exp.shift) unless exp.first.first == :resbody
  els  = process(exp.pop)   unless exp.last.first  == :resbody

  body ||= "# do nothing"
  simple = exp.size == 1

  resbodies = []
  until exp.empty? do
    resbody = exp.shift
    simple &&= resbody[1] == s(:array) && resbody[2] != nil
    resbodies << process(resbody)
  end

  if els then
    "#{indent body}\n#{resbodies.join("\n")}\nelse\n#{indent els}"
  elsif simple then
    resbody = resbodies.first.sub(/\n\s*/, ' ')
    "#{body} #{resbody}"
  else
    "#{indent body}\n#{resbodies.join("\n")}"
  end
end

#process_retry(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 686

def process_retry(exp)
  "retry"
end

#process_return(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 690

def process_return(exp)
  # HACK return "return" + (exp.empty? ? "" : " #{process exp.shift}")

  if exp.empty? then
    return "return"
  else
    return "return #{process exp.shift}"
  end
end

#process_sclass(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 700

def process_sclass(exp)
  "class << #{process(exp.shift)}\n#{indent(process(exp.shift))}\nend"
end

#process_scope(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 704

def process_scope(exp)
  exp.empty? ? "" : process(exp.shift)
end

#process_self(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 708

def process_self(exp)
  "self"
end

#process_splat(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 712

def process_splat(exp)
  if exp.empty? then
    "*"
  else
    "*#{process(exp.shift)}"
  end
end

#process_str(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 720

def process_str(exp)
  return exp.shift.dump
end

#process_super(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 724

def process_super(exp)
  args = []
  until exp.empty? do
    args << process(exp.shift)
  end

  "super(#{args.join(', ')})"
end

#process_svalue(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 733

def process_svalue(exp)
  code = []
  until exp.empty? do
    code << process(exp.shift)
  end
  code.join(", ")
end

#process_to_ary(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 741

def process_to_ary(exp)
  process(exp.shift)
end

#process_true(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 745

def process_true(exp)
  "true"
end

#process_undef(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 749

def process_undef(exp)
  "undef #{process(exp.shift)}"
end

#process_until(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 753

def process_until(exp)
  cond_loop(exp, 'until')
end

#process_valias(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 757

def process_valias(exp)
  "alias #{exp.shift} #{exp.shift}"
end

#process_when(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 761

def process_when(exp)
  src = []

  if self.context[1] == :array then # ugh. matz! why not an argscat?!?
    val = process(exp.shift)
    exp.shift # empty body
    return "*#{val}"
  end

  until exp.empty?
    cond = process(exp.shift).to_s[1..-2]
    code = indent(process(exp.shift))
    code = indent "# do nothing" if code =~ /\A\s*\Z/
    src << "when #{cond} then\n#{code.chomp}"
  end

  src.join("\n")
end

#process_while(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 780

def process_while(exp)
  cond_loop(exp, 'while')
end

#process_xstr(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 784

def process_xstr(exp)
  "`#{process_str(exp)[1..-2]}`"
end

#process_yield(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 788

def process_yield(exp)
  args = []
  until exp.empty? do
    args << process(exp.shift)
  end

  unless args.empty? then
    "yield(#{args.join(', ')})"
  else
    "yield"
  end
end

#process_zsuper(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 801

def process_zsuper(exp)
  "super"
end

#rewrite_attrasgn(exp) ⇒ Object

Rewriters:



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# File 'lib/ruby2ruby.rb', line 828

def rewrite_attrasgn exp
  if context.first(2) == [:array, :masgn] then
    exp[0] = :call
    exp[2] = exp[2].to_s.sub(/=$/, '').to_sym
  end

  exp
end

#rewrite_ensure(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 837

def rewrite_ensure exp
  exp = s(:begin, exp) unless context.first == :begin
  exp
end

#rewrite_rescue(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 842

def rewrite_rescue exp
  complex = false
  complex ||= exp.size > 3
  complex ||= exp.block
  complex ||= exp.find_nodes(:resbody).any? { |n| n.array != s(:array) }
  complex ||= exp.find_nodes(:resbody).any? { |n| n.last.nil? }

  handled = context.first == :ensure

  exp = s(:begin, exp) if complex unless handled

  exp
end

#rewrite_svalue(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 856

def rewrite_svalue(exp)
  case exp.last.first
  when :array
    s(:svalue, *exp[1][1..-1])
  when :splat
    exp
  else
    raise "huh: #{exp.inspect}"
  end
end

#splat(sym) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 512

def splat(sym)
  :"*#{sym}"
end

#util_dthing(exp, regx = false) ⇒ Object

Utility Methods:



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# File 'lib/ruby2ruby.rb', line 870

def util_dthing(exp, regx = false)
  s = []
  suck = true
  x = exp.shift.gsub(/"/, '\"').gsub(/\n/, '\n')
  x.gsub!(/\//, '\/') if regx

  s << x
  until exp.empty?
    pt = exp.shift
    case pt
    when Sexp then
      case pt.first
      when :str then
        x = pt.last.gsub(/"/, '\"').gsub(/\n/, '\n')
        x.gsub!(/\//, '\/') if regx
        s << x
      else
        s << '#{' << process(pt) << '}' # do not use interpolation here
      end
    else
      # HACK: raise "huh?: #{pt.inspect}"
      # do nothing for now
    end
  end

  s.join
end

#util_module_or_class(exp, is_class = false) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 898

def util_module_or_class(exp, is_class=false)
  result = []

  name = exp.shift
  name = process name if Sexp === name

  result << name

  if is_class then
    superk = process(exp.shift)
    result << " < #{superk}" if superk
  end

  result << "\n"

  body = []
  begin
    code = process(exp.shift).chomp
    body << code unless code.nil? or code.empty?
  end until exp.empty?

  unless body.empty? then
    body = indent(body.join("\n\n")) + "\n"
  else
    body = ""
  end
  result << body
  result << "end"

  result.join
end