Class: Ruby2Ruby

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

Overview

Generate ruby code from a sexp.

Constant Summary collapse

VERSION =

:nodoc:

"2.0.5"
LINE_LENGTH =

cutoff for one-liners

78
BINARY =

binary operation messages

[:<=>, :==, :<, :>, :<=, :>=, :-, :+, :*, :/, :%, :<<, :>>, :**]
ASSIGN_NODES =

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

TODO: this should be replaced with full precedence support :/

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Ruby2Ruby

:nodoc:



60
61
62
63
64
65
66
67
68
69
70
 
# File 'lib/ruby2ruby.rb', line 60

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

  @calls = []

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

Instance Method Details

#cond_loop(exp, name) ⇒ Object

Generate a post-or-pre conditional loop.



938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
 
# File 'lib/ruby2ruby.rb', line 938

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

#dthing_escape(type, lit) ⇒ Object

Utility method to escape something interpolated.



961
962
963
964
965
966
967
968
969
970
971
972
973
 
# File 'lib/ruby2ruby.rb', line 961

def dthing_escape type, lit
  lit = lit.gsub(/\n/, '\n')
  case type
  when :dregx then
    lit.gsub(/(\A|[^\\])\//, '\1\/')
  when :dstr, :dsym then
    lit.gsub(/"/, '\"')
  when :dxstr then
    lit.gsub(/`/, '\`')
  else
    raise "unsupported type #{type.inspect}"
  end
end

#finish(exp) ⇒ Object

Process all the remaining stuff in exp and return the results sans-nils.



979
980
981
982
983
984
985
 
# File 'lib/ruby2ruby.rb', line 979

def finish exp # REFACTOR: work this out of the rest of the processors
  body = []
  until exp.empty? do
    body << process(exp.shift)
  end
  body.compact
end

#indent(s) ⇒ Object

Indent all lines of s to the current indent level.



990
991
992
 
# File 'lib/ruby2ruby.rb', line 990

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

#parenthesize(exp) ⇒ Object

Wrap appropriate expressions in matching parens.



997
998
999
1000
1001
1002
1003
1004
 
# File 'lib/ruby2ruby.rb', line 997

def parenthesize exp
  case self.context[1]
  when nil, :defn, :defs, :class, :sclass, :if, :iter, :resbody, :when, :while then
    exp
  else
    "(#{exp})"
  end
end

#process_alias(exp) ⇒ Object

Processors



75
76
77
 
# File 'lib/ruby2ruby.rb', line 75

def process_alias(exp) # :nodoc:
  parenthesize "alias #{process(exp.shift)} #{process(exp.shift)}"
end

#process_and(exp) ⇒ Object

:nodoc:



79
80
81
 
# File 'lib/ruby2ruby.rb', line 79

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

#process_arglist(exp) ⇒ Object

custom made node # :nodoc:



83
84
85
86
87
88
89
 
# File 'lib/ruby2ruby.rb', line 83

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

#process_args(exp) ⇒ Object

:nodoc:



91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
 
# File 'lib/ruby2ruby.rb', line 91

def process_args(exp) # :nodoc:
  args = []

  until exp.empty? do
    arg = exp.shift
    case arg
    when Symbol then
      args << arg
    when Sexp then
      case arg.first
      when :lasgn then
        args << process(arg)
      else
        raise "unknown arg type #{arg.first.inspect}"
      end
    else
      raise "unknown arg type #{arg.inspect}"
    end
  end

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

#process_array(exp) ⇒ Object

:nodoc:



114
115
116
 
# File 'lib/ruby2ruby.rb', line 114

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

#process_attrasgn(exp) ⇒ Object

:nodoc:



118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
 
# File 'lib/ruby2ruby.rb', line 118

def process_attrasgn(exp) # :nodoc:
  receiver = process exp.shift
  name = exp.shift
  rhs  = exp.pop
  args = s(:array, *exp)
  exp.clear

  case name
  when :[]= then
    args = process args
    "#{receiver}#{args} = #{process rhs}"
  else
    raise "dunno what to do: #{args.inspect}" unless args.size == 1 # s(:array)
    name = name.to_s.sub(/=$/, '')
    if rhs && rhs != s(:arglist) then
      "#{receiver}.#{name} = #{process(rhs)}"
    else
      raise "dunno what to do: #{rhs.inspect}"
    end
  end
end

#process_back_ref(exp) ⇒ Object

:nodoc:



140
141
142
 
# File 'lib/ruby2ruby.rb', line 140

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

#process_begin(exp) ⇒ Object

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



145
146
147
148
149
150
151
152
153
154
155
 
# File 'lib/ruby2ruby.rb', line 145

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

#process_block(exp) ⇒ Object

:nodoc:



157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
 
# File 'lib/ruby2ruby.rb', line 157

def process_block(exp) # :nodoc:
  result = []

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

  result = parenthesize result.join "\n"
  result += "\n" unless result.start_with? "("

  return result
end

#process_block_pass(exp) ⇒ Object

:nodoc:



176
177
178
179
180
 
# File 'lib/ruby2ruby.rb', line 176

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

  "&#{process exp.shift}"
end

#process_break(exp) ⇒ Object

:nodoc:



182
183
184
185
186
187
188
189
190
 
# File 'lib/ruby2ruby.rb', line 182

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

#process_call(exp) ⇒ Object

:nodoc:



192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
 
# File 'lib/ruby2ruby.rb', line 192

def process_call(exp) # :nodoc:
  receiver_node_type = exp.first.nil? ? nil : exp.first.first
  receiver = process exp.shift
  receiver = "(#{receiver})" if ASSIGN_NODES.include? receiver_node_type

  name = exp.shift
  args = []

  # this allows us to do both old and new sexp forms:
  exp.push(*exp.pop[1..-1]) if exp.size == 1 && exp.first.first == :arglist

  @calls.push name

  in_context :arglist do
    until exp.empty? do
      arg_type = exp.first.sexp_type
      is_empty_hash = (exp.first == s(:hash))
      arg = process exp.shift

      next if arg.empty?

      strip_hash = (arg_type == :hash and
                    not BINARY.include? name and
                    not is_empty_hash and
                    (exp.empty? or exp.first.sexp_type == :splat))
      wrap_arg = Ruby2Ruby::ASSIGN_NODES.include? arg_type

      arg = arg[2..-3] if strip_hash
      arg = "(#{arg})" if wrap_arg

      args << arg
    end
  end

  case name
  when *BINARY then
    "(#{receiver} #{name} #{args.join(', ')})"
  when :[] then
    receiver ||= "self"
    "#{receiver}[#{args.join(', ')}]"
  when :[]= then
    receiver ||= "self"
    rhs = args.pop
    "#{receiver}[#{args.join(', ')}] = #{rhs}"
  when :"!" then
    "(not #{receiver})"
  when :"-@" then
    "-#{receiver}"
  when :"+@" then
    "+#{receiver}"
  else
    args     = nil                    if args.empty?
    args     = "(#{args.join(', ')})" if args
    receiver = "#{receiver}."         if receiver

    "#{receiver}#{name}#{args}"
  end
ensure
  @calls.pop
end

#process_case(exp) ⇒ Object

:nodoc:



253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
 
# File 'lib/ruby2ruby.rb', line 253

def process_case(exp) # :nodoc:
  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

:nodoc:



275
276
277
278
279
280
281
282
283
284
 
# File 'lib/ruby2ruby.rb', line 275

def process_cdecl(exp) # :nodoc:
  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

:nodoc:



286
287
288
 
# File 'lib/ruby2ruby.rb', line 286

def process_class(exp) # :nodoc:
  "#{exp.comments}class #{util_module_or_class(exp, true)}"
end

#process_colon2(exp) ⇒ Object

:nodoc:



290
291
292
 
# File 'lib/ruby2ruby.rb', line 290

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

#process_colon3(exp) ⇒ Object

:nodoc:



294
295
296
 
# File 'lib/ruby2ruby.rb', line 294

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

#process_const(exp) ⇒ Object

:nodoc:



298
299
300
 
# File 'lib/ruby2ruby.rb', line 298

def process_const(exp) # :nodoc:
  exp.shift.to_s
end

#process_cvar(exp) ⇒ Object

:nodoc:



302
303
304
 
# File 'lib/ruby2ruby.rb', line 302

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

#process_cvasgn(exp) ⇒ Object

:nodoc:



306
307
308
 
# File 'lib/ruby2ruby.rb', line 306

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

#process_cvdecl(exp) ⇒ Object

:nodoc:



310
311
312
 
# File 'lib/ruby2ruby.rb', line 310

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

#process_defined(exp) ⇒ Object

:nodoc:



314
315
316
 
# File 'lib/ruby2ruby.rb', line 314

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

#process_defn(exp) ⇒ Object

:nodoc:



318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
 
# File 'lib/ruby2ruby.rb', line 318

def process_defn(exp) # :nodoc:
  type1 = exp[1].first
  type2 = exp[2].first rescue nil
  expect = [:ivar, :iasgn, :attrset]

  # s(name, args, ivar|iasgn|attrset)
  if exp.size == 3 and type1 == :args and expect.include? type2 then
    name = exp.first # don't shift in case we pass through
    case type2
    when :ivar then
      ivar_name = exp.ivar.last

      meth_name = ivar_name.to_s[1..-1].to_sym
      expected = s(meth_name, s(:args), s(:ivar, ivar_name))

      if exp == expected then
        exp.clear
        return "attr_reader #{name.inspect}"
      end
    when :attrset then
      # TODO: deprecate? this is a PT relic
      exp.clear
      return "attr_writer :#{name.to_s[0..-2]}"
    when :iasgn then
      ivar_name = exp.iasgn[1]
      meth_name = "#{ivar_name.to_s[1..-1]}=".to_sym
      arg_name = exp.args.last
      expected = s(meth_name, s(:args, arg_name),
                   s(:iasgn, ivar_name, s(:lvar, arg_name)))

      if exp == expected then
        exp.clear
        return "attr_writer :#{name.to_s[0..-2]}"
      end
    else
      raise "Unknown defn type: #{exp.inspect}"
    end
  end

  comm = exp.comments
  name = exp.shift
  args = process exp.shift
  args = "" if args == "()"

  exp.shift if exp == s(s(:nil)) # empty it out of a default nil expression

  body = []
  until exp.empty? do
    body << indent(process(exp.shift))
  end

  body << indent("# do nothing") if body.empty?

  body = body.join("\n")

  return "#{comm}def #{name}#{args}\n#{body}\nend".gsub(/\n\s*\n+/, "\n")
end

#process_defs(exp) ⇒ Object

:nodoc:



376
377
378
379
380
381
382
383
384
385
386
 
# File 'lib/ruby2ruby.rb', line 376

def process_defs(exp) # :nodoc:
  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

:nodoc:



388
389
390
 
# File 'lib/ruby2ruby.rb', line 388

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

#process_dot3(exp) ⇒ Object

:nodoc:



392
393
394
 
# File 'lib/ruby2ruby.rb', line 392

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

#process_dregx(exp) ⇒ Object

:nodoc:



396
397
398
399
 
# File 'lib/ruby2ruby.rb', line 396

def process_dregx(exp) # :nodoc:
  options = re_opt exp.pop if Fixnum === exp.last
  "/" << util_dthing(:dregx, exp) << "/#{options}"
end

#process_dregx_once(exp) ⇒ Object

:nodoc:



401
402
403
 
# File 'lib/ruby2ruby.rb', line 401

def process_dregx_once(exp) # :nodoc:
  process_dregx(exp) + "o"
end

#process_dstr(exp) ⇒ Object

:nodoc:



405
406
407
 
# File 'lib/ruby2ruby.rb', line 405

def process_dstr(exp) # :nodoc:
  "\"#{util_dthing(:dstr, exp)}\""
end

#process_dsym(exp) ⇒ Object

:nodoc:



409
410
411
 
# File 'lib/ruby2ruby.rb', line 409

def process_dsym(exp) # :nodoc:
  ":\"#{util_dthing(:dsym, exp)}\""
end

#process_dxstr(exp) ⇒ Object

:nodoc:



413
414
415
 
# File 'lib/ruby2ruby.rb', line 413

def process_dxstr(exp) # :nodoc:
  "`#{util_dthing(:dxstr, exp)}`"
end

#process_ensure(exp) ⇒ Object

:nodoc:



417
418
419
420
421
422
423
424
425
426
427
428
 
# File 'lib/ruby2ruby.rb', line 417

def process_ensure(exp) # :nodoc:
  body = process exp.shift
  ens  = exp.shift
  ens  = nil if ens == s(:nil)
  ens  = process(ens) || "# do nothing"
  ens = "begin\n#{ens}\nend\n" if ens =~ /(^|\n)rescue/

  body.sub!(/\n\s*end\z/, '')
  body = indent(body) unless body =~ /(^|\n)rescue/

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

#process_evstr(exp) ⇒ Object

:nodoc:



430
431
432
 
# File 'lib/ruby2ruby.rb', line 430

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

#process_false(exp) ⇒ Object

:nodoc:



434
435
436
 
# File 'lib/ruby2ruby.rb', line 434

def process_false(exp) # :nodoc:
  "false"
end

#process_flip2(exp) ⇒ Object

:nodoc:



438
439
440
 
# File 'lib/ruby2ruby.rb', line 438

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

#process_flip3(exp) ⇒ Object

:nodoc:



442
443
444
 
# File 'lib/ruby2ruby.rb', line 442

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

#process_for(exp) ⇒ Object

:nodoc:



446
447
448
449
450
451
452
453
454
455
456
 
# File 'lib/ruby2ruby.rb', line 446

def process_for(exp) # :nodoc:
  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

:nodoc:



458
459
460
 
# File 'lib/ruby2ruby.rb', line 458

def process_gasgn(exp) # :nodoc:
  process_iasgn(exp)
end

#process_gvar(exp) ⇒ Object

:nodoc:



462
463
464
 
# File 'lib/ruby2ruby.rb', line 462

def process_gvar(exp) # :nodoc:
  return exp.shift.to_s
end

#process_hash(exp) ⇒ Object

:nodoc:



466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
 
# File 'lib/ruby2ruby.rb', line 466

def process_hash(exp) # :nodoc:
  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

  return result.empty? ? "{}" : "{ #{result.join(', ')} }"
end

#process_iasgn(exp) ⇒ Object

:nodoc:



482
483
484
485
486
487
488
489
 
# File 'lib/ruby2ruby.rb', line 482

def process_iasgn(exp) # :nodoc:
  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

:nodoc:



491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
 
# File 'lib/ruby2ruby.rb', line 491

def process_if(exp) # :nodoc:
  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
  elsif f
    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"
  else
    # empty if statement, just do it in case of side effects from condition
    "if #{c} then\n#{indent '# do nothing'}\nend"
  end
end

#process_iter(exp) ⇒ Object

:nodoc:



527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
 
# File 'lib/ruby2ruby.rb', line 527

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

  args = case args
         when 0 then
           " ||"
         else
           a = process(args)[1..-2]
           a = " |#{a}|" unless a.empty?
           a
         end

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

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

  # REFACTOR: ugh
  result = []
  result << "#{iter} {"
  result << 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
  result << "\n"
  if body then
    result << indent(body.strip)
    result << "\n"
  end
  result << e
  result.join
end

#process_ivar(exp) ⇒ Object

:nodoc:



574
575
576
 
# File 'lib/ruby2ruby.rb', line 574

def process_ivar(exp) # :nodoc:
  exp.shift.to_s
end

#process_lasgn(exp) ⇒ Object

:nodoc:



578
579
580
581
582
 
# File 'lib/ruby2ruby.rb', line 578

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

#process_lit(exp) ⇒ Object

:nodoc:



584
585
586
587
588
589
590
591
592
 
# File 'lib/ruby2ruby.rb', line 584

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

#process_lvar(exp) ⇒ Object

:nodoc:



594
595
596
 
# File 'lib/ruby2ruby.rb', line 594

def process_lvar(exp) # :nodoc:
  exp.shift.to_s
end

#process_masgn(exp) ⇒ Object

:nodoc:



598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
 
# File 'lib/ruby2ruby.rb', line 598

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

  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 == :array # FIX: bad? I dunno
    return "#{lhs.join(", ")} = #{rhs}"
  else
    return lhs.join(", ")
  end
end

#process_match(exp) ⇒ Object

:nodoc:



636
637
638
 
# File 'lib/ruby2ruby.rb', line 636

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

#process_match2(exp) ⇒ Object

:nodoc:



640
641
642
643
644
 
# File 'lib/ruby2ruby.rb', line 640

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

#process_match3(exp) ⇒ Object

:nodoc:



646
647
648
649
650
651
652
653
654
655
656
 
# File 'lib/ruby2ruby.rb', line 646

def process_match3(exp) # :nodoc:
  rhs = process(exp.shift)
  left_type = exp.first.sexp_type
  lhs = process(exp.shift)

  if ASSIGN_NODES.include? left_type then
    "(#{lhs}) =~ #{rhs}"
  else
    "#{lhs} =~ #{rhs}"
  end
end

#process_module(exp) ⇒ Object

:nodoc:



658
659
660
 
# File 'lib/ruby2ruby.rb', line 658

def process_module(exp) # :nodoc:
  "#{exp.comments}module #{util_module_or_class(exp)}"
end

#process_next(exp) ⇒ Object

:nodoc:



662
663
664
665
666
667
668
669
 
# File 'lib/ruby2ruby.rb', line 662

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

#process_nil(exp) ⇒ Object

:nodoc:



671
672
673
 
# File 'lib/ruby2ruby.rb', line 671

def process_nil(exp) # :nodoc:
  "nil"
end

#process_not(exp) ⇒ Object

:nodoc:



675
676
677
 
# File 'lib/ruby2ruby.rb', line 675

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

#process_nth_ref(exp) ⇒ Object

:nodoc:



679
680
681
 
# File 'lib/ruby2ruby.rb', line 679

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

#process_op_asgn1(exp) ⇒ Object

:nodoc:



683
684
685
686
687
688
689
690
691
 
# File 'lib/ruby2ruby.rb', line 683

def process_op_asgn1(exp) # :nodoc:
  # [[: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

:nodoc:



693
694
695
696
697
698
699
700
701
702
 
# File 'lib/ruby2ruby.rb', line 693

def process_op_asgn2(exp) # :nodoc:
  # [[: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

:nodoc:



704
705
706
707
708
709
 
# File 'lib/ruby2ruby.rb', line 704

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

#process_op_asgn_or(exp) ⇒ Object

:nodoc:



711
712
713
714
715
716
 
# File 'lib/ruby2ruby.rb', line 711

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

#process_or(exp) ⇒ Object

:nodoc:



718
719
720
 
# File 'lib/ruby2ruby.rb', line 718

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

#process_postexe(exp) ⇒ Object

:nodoc:



722
723
724
 
# File 'lib/ruby2ruby.rb', line 722

def process_postexe(exp) # :nodoc:
  "END"
end

#process_redo(exp) ⇒ Object

:nodoc:



726
727
728
 
# File 'lib/ruby2ruby.rb', line 726

def process_redo(exp) # :nodoc:
  "redo"
end

#process_resbody(exp) ⇒ Object

:nodoc:



730
731
732
733
734
735
736
737
738
739
740
741
742
 
# File 'lib/ruby2ruby.rb', line 730

def process_resbody exp # :nodoc:
  args = exp.shift
  body = finish(exp)
  body << "# do nothing" if body.empty?

  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.join("\n")}"
end

#process_rescue(exp) ⇒ Object

:nodoc:



744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
 
# File 'lib/ruby2ruby.rb', line 744

def process_rescue exp # :nodoc:
  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 && !exp.resbody.block


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

:nodoc:



770
771
772
 
# File 'lib/ruby2ruby.rb', line 770

def process_retry(exp) # :nodoc:
  "retry"
end

#process_return(exp) ⇒ Object

:nodoc:



774
775
776
777
778
779
780
781
782
 
# File 'lib/ruby2ruby.rb', line 774

def process_return(exp) # :nodoc:
  # 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

:nodoc:



784
785
786
 
# File 'lib/ruby2ruby.rb', line 784

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

#process_self(exp) ⇒ Object

:nodoc:



788
789
790
 
# File 'lib/ruby2ruby.rb', line 788

def process_self(exp) # :nodoc:
  "self"
end

#process_splat(exp) ⇒ Object

:nodoc:



792
793
794
795
796
797
798
 
# File 'lib/ruby2ruby.rb', line 792

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

#process_str(exp) ⇒ Object

:nodoc:



800
801
802
 
# File 'lib/ruby2ruby.rb', line 800

def process_str(exp) # :nodoc:
  return exp.shift.dump
end

#process_super(exp) ⇒ Object

:nodoc:



804
805
806
807
808
 
# File 'lib/ruby2ruby.rb', line 804

def process_super(exp) # :nodoc:
  args = finish exp

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

#process_svalue(exp) ⇒ Object

:nodoc:



810
811
812
813
814
815
816
 
# File 'lib/ruby2ruby.rb', line 810

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

#process_to_ary(exp) ⇒ Object

:nodoc:



818
819
820
 
# File 'lib/ruby2ruby.rb', line 818

def process_to_ary(exp) # :nodoc:
  process(exp.shift)
end

#process_true(exp) ⇒ Object

:nodoc:



822
823
824
 
# File 'lib/ruby2ruby.rb', line 822

def process_true(exp) # :nodoc:
  "true"
end

#process_undef(exp) ⇒ Object

:nodoc:



826
827
828
 
# File 'lib/ruby2ruby.rb', line 826

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

#process_until(exp) ⇒ Object

:nodoc:



830
831
832
 
# File 'lib/ruby2ruby.rb', line 830

def process_until(exp) # :nodoc:
  cond_loop(exp, 'until')
end

#process_valias(exp) ⇒ Object

:nodoc:



834
835
836
 
# File 'lib/ruby2ruby.rb', line 834

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

#process_when(exp) ⇒ Object

:nodoc:



838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
 
# File 'lib/ruby2ruby.rb', line 838

def process_when(exp) # :nodoc:
  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(finish(exp).join("\n"))
    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

:nodoc:



857
858
859
 
# File 'lib/ruby2ruby.rb', line 857

def process_while(exp) # :nodoc:
  cond_loop(exp, 'while')
end

#process_xstr(exp) ⇒ Object

:nodoc:



861
862
863
 
# File 'lib/ruby2ruby.rb', line 861

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

#process_yield(exp) ⇒ Object

:nodoc:



865
866
867
868
869
870
871
872
873
874
875
876
 
# File 'lib/ruby2ruby.rb', line 865

def process_yield(exp) # :nodoc:
  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

:nodoc:



878
879
880
 
# File 'lib/ruby2ruby.rb', line 878

def process_zsuper(exp) # :nodoc:
  "super"
end

#re_opt(options) ⇒ Object

Return the appropriate regexp flags for a given numeric code.



1009
1010
1011
1012
1013
 
# File 'lib/ruby2ruby.rb', line 1009

def re_opt options
  bits = (0..8).map { |n| options[n] * 2**n }
  bits.delete 0
  bits.map { |n| Regexp::CODES[n] }.join
end

#rewrite_attrasgn(exp) ⇒ Object

Rewriters:



885
886
887
888
889
890
891
892
 
# File 'lib/ruby2ruby.rb', line 885

def rewrite_attrasgn exp # :nodoc:
  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

:nodoc:



894
895
896
897
 
# File 'lib/ruby2ruby.rb', line 894

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

#rewrite_resbody(exp) ⇒ Object

:nodoc:



899
900
901
902
903
904
 
# File 'lib/ruby2ruby.rb', line 899

def rewrite_resbody exp # :nodoc:
  raise "no exception list in #{exp.inspect}" unless exp.size > 2 && exp[1]
  raise exp[1].inspect if exp[1][0] != :array
  # for now, do nothing, just check and freak if we see an errant structure
  exp
end

#rewrite_rescue(exp) ⇒ Object

:nodoc:



906
907
908
909
910
911
912
913
914
915
916
917
918
919
 
# File 'lib/ruby2ruby.rb', line 906

def rewrite_rescue exp # :nodoc:
  complex = false
  complex ||= exp.size > 3
  complex ||= exp.resbody.block
  complex ||= exp.find_nodes(:resbody).any? { |n| n[1] != s(:array) }
  complex ||= exp.find_nodes(:resbody).any? { |n| n.last.nil? }
  complex ||= exp.find_nodes(:resbody).any? { |n| n[2] and n[2].node_type == :block }

  handled = context.first == :ensure

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

  exp
end

#rewrite_svalue(exp) ⇒ Object

:nodoc:



921
922
923
924
925
926
927
928
929
930
 
# File 'lib/ruby2ruby.rb', line 921

def rewrite_svalue(exp) # :nodoc:
  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

Return a splatted symbol for sym.



1018
1019
1020
 
# File 'lib/ruby2ruby.rb', line 1018

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

#util_dthing(type, exp) ⇒ Object

Utility method to generate something interpolated.



1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
 
# File 'lib/ruby2ruby.rb', line 1025

def util_dthing(type, exp)
  s = []

  # first item in sexp is a string literal
  s << dthing_escape(type, exp.shift)

  until exp.empty?
    pt = exp.shift
    case pt
    when Sexp then
      case pt.first
      when :str then
        s << dthing_escape(type, pt.last)
      when :evstr then
        s << '#{' << process(pt) << '}' # do not use interpolation here
      else
        raise "unknown type: #{pt.inspect}"
      end
    else
      raise "unhandled value in d-thing: #{pt.inspect}"
    end
  end

  s.join
end

#util_module_or_class(exp, is_class = false) ⇒ Object

Utility method to generate ether a module or class.



1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
 
# File 'lib/ruby2ruby.rb', line 1054

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) unless exp.empty?
    body << code.chomp unless code.nil? or code.chomp.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