Class: Ruby2Ruby

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

Constant Summary collapse

VERSION = 
'1.2.2'
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 



43
44
45
46
47
48
49
50
51
 
# File 'lib/ruby2ruby.rb', line 43

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 



28
29
30
31
32
33
34
35
36
37
38
39
40
41
 
# File 'lib/ruby2ruby.rb', line 28

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

  unifier = Unifier.new

  unifier.processors.each do |p|
    p.unsupported.delete :cfunc # HACK
  end

  sexp = unifier.process(sexp)

  self.new.process(sexp)
end

Instance Method Details

#cond_loop(exp, name) ⇒ Object 



812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
 
# File 'lib/ruby2ruby.rb', line 812

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 



937
938
939
 
# File 'lib/ruby2ruby.rb', line 937

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

#process_alias(exp) ⇒ Object

Processors



56
57
58
 
# File 'lib/ruby2ruby.rb', line 56

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

#process_and(exp) ⇒ Object 



60
61
62
 
# File 'lib/ruby2ruby.rb', line 60

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

#process_arglist(exp) ⇒ Object

custom made node



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

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

#process_args(exp) ⇒ Object 



72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
 
# File 'lib/ruby2ruby.rb', line 72

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 



102
103
104
 
# File 'lib/ruby2ruby.rb', line 102

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

#process_attrasgn(exp) ⇒ Object 



106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
 
# File 'lib/ruby2ruby.rb', line 106

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 



123
124
125
 
# File 'lib/ruby2ruby.rb', line 123

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



128
129
130
131
132
133
134
135
136
137
138
 
# File 'lib/ruby2ruby.rb', line 128

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 



140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
 
# File 'lib/ruby2ruby.rb', line 140

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 



165
166
167
168
169
 
# File 'lib/ruby2ruby.rb', line 165

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

  "&#{process exp.shift}"
end

#process_break(exp) ⇒ Object 



171
172
173
174
175
176
177
178
179
 
# File 'lib/ruby2ruby.rb', line 171

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 



181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
 
# File 'lib/ruby2ruby.rb', line 181

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.shift rescue nil

  case name
  when :<=>, :==, :<, :>, :<=, :>=, :-, :+, :*, :/, :%, :<<, :>>, :** then
    "(#{receiver} #{name} #{process args})"
  when :[] then
    receiver = "self" if receiver.nil?
    "#{receiver}[#{process args}]"
  when :[]= then
    receiver = "self" if receiver.nil?
    lhs = args.pop
    "#{receiver}[#{process args}] = #{process lhs}"
  when :"-@" then
    "-#{receiver}"
  when :"+@" then
    "+#{receiver}"
  else
    args     = process args
    args     = nil            if args.empty?
    args     = "(#{args})"    if args
    receiver = "#{receiver}." if receiver

    "#{receiver}#{name}#{args}"
  end
end

#process_case(exp) ⇒ Object 



215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
 
# File 'lib/ruby2ruby.rb', line 215

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 



237
238
239
240
241
242
243
244
245
246
 
# File 'lib/ruby2ruby.rb', line 237

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 



248
249
250
 
# File 'lib/ruby2ruby.rb', line 248

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

#process_colon2(exp) ⇒ Object 



252
253
254
 
# File 'lib/ruby2ruby.rb', line 252

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

#process_colon3(exp) ⇒ Object 



256
257
258
 
# File 'lib/ruby2ruby.rb', line 256

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

#process_const(exp) ⇒ Object 



260
261
262
 
# File 'lib/ruby2ruby.rb', line 260

def process_const(exp)
  exp.shift.to_s
end

#process_cvar(exp) ⇒ Object 



264
265
266
 
# File 'lib/ruby2ruby.rb', line 264

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

#process_cvasgn(exp) ⇒ Object 



268
269
270
 
# File 'lib/ruby2ruby.rb', line 268

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

#process_cvdecl(exp) ⇒ Object 



272
273
274
 
# File 'lib/ruby2ruby.rb', line 272

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

#process_defined(exp) ⇒ Object 



276
277
278
 
# File 'lib/ruby2ruby.rb', line 276

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

#process_defn(exp) ⇒ Object 



280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
 
# File 'lib/ruby2ruby.rb', line 280

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 



310
311
312
313
314
315
316
317
318
319
320
 
# File 'lib/ruby2ruby.rb', line 310

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 



322
323
324
 
# File 'lib/ruby2ruby.rb', line 322

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

#process_dot3(exp) ⇒ Object 



326
327
328
 
# File 'lib/ruby2ruby.rb', line 326

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

#process_dregx(exp) ⇒ Object 



330
331
332
 
# File 'lib/ruby2ruby.rb', line 330

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

#process_dregx_once(exp) ⇒ Object 



334
335
336
 
# File 'lib/ruby2ruby.rb', line 334

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

#process_dstr(exp) ⇒ Object 



338
339
340
 
# File 'lib/ruby2ruby.rb', line 338

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

#process_dsym(exp) ⇒ Object 



342
343
344
 
# File 'lib/ruby2ruby.rb', line 342

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

#process_dxstr(exp) ⇒ Object 



346
347
348
 
# File 'lib/ruby2ruby.rb', line 346

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

#process_ensure(exp) ⇒ Object 



350
351
352
353
354
355
356
357
358
359
 
# File 'lib/ruby2ruby.rb', line 350

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 



361
362
363
 
# File 'lib/ruby2ruby.rb', line 361

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

#process_false(exp) ⇒ Object 



365
366
367
 
# File 'lib/ruby2ruby.rb', line 365

def process_false(exp)
  "false"
end

#process_flip2(exp) ⇒ Object 



369
370
371
 
# File 'lib/ruby2ruby.rb', line 369

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

#process_flip3(exp) ⇒ Object 



373
374
375
 
# File 'lib/ruby2ruby.rb', line 373

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

#process_for(exp) ⇒ Object 



377
378
379
380
381
382
383
384
385
386
387
 
# File 'lib/ruby2ruby.rb', line 377

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 



389
390
391
 
# File 'lib/ruby2ruby.rb', line 389

def process_gasgn(exp)
  process_iasgn(exp)
end

#process_gvar(exp) ⇒ Object 



393
394
395
 
# File 'lib/ruby2ruby.rb', line 393

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

#process_hash(exp) ⇒ Object 



397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
 
# File 'lib/ruby2ruby.rb', line 397

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
    unless result.empty? then
      return "#{result.join(', ')}" # HACK - this will break w/ 2 hashes as args
    else
      return "{}"
    end
  else
    return "{ #{result.join(', ')} }"
  end
end

#process_iasgn(exp) ⇒ Object 



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

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 



430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
 
# File 'lib/ruby2ruby.rb', line 430

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 



463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
 
# File 'lib/ruby2ruby.rb', line 463

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"
  if body then
    result << indent(body.strip)
    result << "\n"
  end
  result << e
  result.join
end

#process_ivar(exp) ⇒ Object 



502
503
504
 
# File 'lib/ruby2ruby.rb', line 502

def process_ivar(exp)
  exp.shift.to_s
end

#process_lasgn(exp) ⇒ Object 



506
507
508
509
510
 
# File 'lib/ruby2ruby.rb', line 506

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

#process_lit(exp) ⇒ Object 



512
513
514
515
516
517
518
519
520
 
# File 'lib/ruby2ruby.rb', line 512

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

#process_lvar(exp) ⇒ Object 



522
523
524
 
# File 'lib/ruby2ruby.rb', line 522

def process_lvar(exp)
  exp.shift.to_s
end

#process_masgn(exp) ⇒ Object 



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
 
# File 'lib/ruby2ruby.rb', line 530

def process_masgn(exp)
  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 



568
569
570
 
# File 'lib/ruby2ruby.rb', line 568

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

#process_match2(exp) ⇒ Object 



572
573
574
575
576
 
# File 'lib/ruby2ruby.rb', line 572

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

#process_match3(exp) ⇒ Object 



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

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

#process_module(exp) ⇒ Object 



584
585
586
 
# File 'lib/ruby2ruby.rb', line 584

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

#process_next(exp) ⇒ Object 



588
589
590
591
592
593
594
595
 
# File 'lib/ruby2ruby.rb', line 588

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

#process_nil(exp) ⇒ Object 



597
598
599
 
# File 'lib/ruby2ruby.rb', line 597

def process_nil(exp)
  "nil"
end

#process_not(exp) ⇒ Object 



601
602
603
 
# File 'lib/ruby2ruby.rb', line 601

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

#process_nth_ref(exp) ⇒ Object 



605
606
607
 
# File 'lib/ruby2ruby.rb', line 605

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

#process_op_asgn1(exp) ⇒ Object 



609
610
611
612
613
614
615
616
617
 
# File 'lib/ruby2ruby.rb', line 609

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 



619
620
621
622
623
624
625
626
627
628
 
# File 'lib/ruby2ruby.rb', line 619

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 



630
631
632
633
634
635
 
# File 'lib/ruby2ruby.rb', line 630

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 



637
638
639
640
641
642
 
# File 'lib/ruby2ruby.rb', line 637

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 



644
645
646
 
# File 'lib/ruby2ruby.rb', line 644

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

#process_postexe(exp) ⇒ Object 



648
649
650
 
# File 'lib/ruby2ruby.rb', line 648

def process_postexe(exp)
  "END"
end

#process_redo(exp) ⇒ Object 



652
653
654
 
# File 'lib/ruby2ruby.rb', line 652

def process_redo(exp)
  "redo"
end

#process_resbody(exp) ⇒ Object 



656
657
658
659
660
661
662
663
664
665
666
667
 
# File 'lib/ruby2ruby.rb', line 656

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 



669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
 
# File 'lib/ruby2ruby.rb', line 669

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 



693
694
695
 
# File 'lib/ruby2ruby.rb', line 693

def process_retry(exp)
  "retry"
end

#process_return(exp) ⇒ Object 



697
698
699
700
701
702
703
704
705
 
# File 'lib/ruby2ruby.rb', line 697

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 



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

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

#process_scope(exp) ⇒ Object 



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

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

#process_self(exp) ⇒ Object 



715
716
717
 
# File 'lib/ruby2ruby.rb', line 715

def process_self(exp)
  "self"
end

#process_splat(exp) ⇒ Object 



719
720
721
722
723
724
725
 
# File 'lib/ruby2ruby.rb', line 719

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

#process_str(exp) ⇒ Object 



727
728
729
 
# File 'lib/ruby2ruby.rb', line 727

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

#process_super(exp) ⇒ Object 



731
732
733
734
735
736
737
738
 
# File 'lib/ruby2ruby.rb', line 731

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

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

#process_svalue(exp) ⇒ Object 



740
741
742
743
744
745
746
 
# File 'lib/ruby2ruby.rb', line 740

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

#process_to_ary(exp) ⇒ Object 



748
749
750
 
# File 'lib/ruby2ruby.rb', line 748

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

#process_true(exp) ⇒ Object 



752
753
754
 
# File 'lib/ruby2ruby.rb', line 752

def process_true(exp)
  "true"
end

#process_undef(exp) ⇒ Object 



756
757
758
 
# File 'lib/ruby2ruby.rb', line 756

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

#process_until(exp) ⇒ Object 



760
761
762
 
# File 'lib/ruby2ruby.rb', line 760

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

#process_valias(exp) ⇒ Object 



764
765
766
 
# File 'lib/ruby2ruby.rb', line 764

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

#process_when(exp) ⇒ Object 



768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
 
# File 'lib/ruby2ruby.rb', line 768

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 



787
788
789
 
# File 'lib/ruby2ruby.rb', line 787

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

#process_xstr(exp) ⇒ Object 



791
792
793
 
# File 'lib/ruby2ruby.rb', line 791

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

#process_yield(exp) ⇒ Object 



795
796
797
798
799
800
801
802
803
804
805
806
 
# File 'lib/ruby2ruby.rb', line 795

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 



808
809
810
 
# File 'lib/ruby2ruby.rb', line 808

def process_zsuper(exp)
  "super"
end

#rewrite_attrasgn(exp) ⇒ Object

Rewriters:



835
836
837
838
839
840
841
842
 
# File 'lib/ruby2ruby.rb', line 835

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 



844
845
846
847
 
# File 'lib/ruby2ruby.rb', line 844

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

#rewrite_rescue(exp) ⇒ Object 



849
850
851
852
853
854
855
856
857
858
859
860
861
 
# File 'lib/ruby2ruby.rb', line 849

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 



863
864
865
866
867
868
869
870
871
872
 
# File 'lib/ruby2ruby.rb', line 863

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 



526
527
528
 
# File 'lib/ruby2ruby.rb', line 526

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

#util_dthing(exp, regx = false) ⇒ Object

Utility Methods:



877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
 
# File 'lib/ruby2ruby.rb', line 877

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 



905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
 
# File 'lib/ruby2ruby.rb', line 905

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)
    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