Class: Ruby2Ruby

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

Overview

Generate ruby code from a sexp.

Constant Summary collapse

VERSION =

:nodoc:

"2.3.0"
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
 :rescue,
]
HASH_VAL_NO_PAREN =

Some sexp types are OK without parens when appearing as hash values. This list can include ‘:call`s because they’re always printed with parens around their arguments. For example:

{ :foo => (bar("baz")) } # The outer parens are unnecessary
{ :foo => bar("baz") }   # This is the normal code style

[
  :call,
  :false,
  :lit,
  :lvar,
  :nil,
  :str,
  :true
]

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Ruby2Ruby

:nodoc:



81
82
83
84
85
86
87
88
89
90
91
 
# File 'lib/ruby2ruby.rb', line 81

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.



1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
 
# File 'lib/ruby2ruby.rb', line 1012

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.



1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
 
# File 'lib/ruby2ruby.rb', line 1035

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.



1053
1054
1055
1056
1057
1058
1059
 
# File 'lib/ruby2ruby.rb', line 1053

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.



1064
1065
1066
 
# File 'lib/ruby2ruby.rb', line 1064

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

#parenthesize(exp) ⇒ Object

Wrap appropriate expressions in matching parens.



1071
1072
1073
1074
1075
1076
1077
1078
 
# File 'lib/ruby2ruby.rb', line 1071

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



96
97
98
 
# File 'lib/ruby2ruby.rb', line 96

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

#process_and(exp) ⇒ Object

:nodoc:



100
101
102
 
# File 'lib/ruby2ruby.rb', line 100

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

#process_arglist(exp) ⇒ Object

custom made node # :nodoc:



104
105
106
107
108
109
110
111
112
113
 
# File 'lib/ruby2ruby.rb', line 104

def process_arglist(exp) # custom made node # :nodoc:
  code = []
  until exp.empty? do
    arg = exp.shift
    to_wrap = arg.first == :rescue
    arg_code = process arg
    code << (to_wrap ? "(#{arg_code})" : arg_code)
  end
  code.join ', '
end

#process_args(exp) ⇒ Object

:nodoc:



115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
 
# File 'lib/ruby2ruby.rb', line 115

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)
      when :masgn then
        args << process(arg)
      when :kwarg then
        _, k, v = arg
        args << "#{k}: #{process v}"
      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:



143
144
145
 
# File 'lib/ruby2ruby.rb', line 143

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

#process_attrasgn(exp) ⇒ Object

:nodoc:



147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
 
# File 'lib/ruby2ruby.rb', line 147

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:



169
170
171
 
# File 'lib/ruby2ruby.rb', line 169

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



174
175
176
177
178
179
180
181
182
183
184
 
# File 'lib/ruby2ruby.rb', line 174

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:



186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
 
# File 'lib/ruby2ruby.rb', line 186

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:



205
206
207
208
209
 
# File 'lib/ruby2ruby.rb', line 205

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

  "&#{process exp.shift}"
end

#process_break(exp) ⇒ Object

:nodoc:



211
212
213
214
215
216
217
218
219
 
# File 'lib/ruby2ruby.rb', line 211

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, safe_call = false) ⇒ Object

:nodoc:



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
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
 
# File 'lib/ruby2ruby.rb', line 221

def process_call(exp, safe_call = false) # :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
    if safe_call
      "#{receiver}&.#{name}(#{args.join(', ')})"
    else
      "(#{receiver} #{name} #{args.join(', ')})"
    end
  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 and not safe_call
    receiver = "#{receiver}&."        if receiver and safe_call

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

#process_case(exp) ⇒ Object

:nodoc:



291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
 
# File 'lib/ruby2ruby.rb', line 291

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:



313
314
315
316
317
318
319
320
321
322
 
# File 'lib/ruby2ruby.rb', line 313

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:



324
325
326
 
# File 'lib/ruby2ruby.rb', line 324

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

#process_colon2(exp) ⇒ Object

:nodoc:



328
329
330
 
# File 'lib/ruby2ruby.rb', line 328

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

#process_colon3(exp) ⇒ Object

:nodoc:



332
333
334
 
# File 'lib/ruby2ruby.rb', line 332

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

#process_const(exp) ⇒ Object

:nodoc:



336
337
338
 
# File 'lib/ruby2ruby.rb', line 336

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

#process_cvar(exp) ⇒ Object

:nodoc:



340
341
342
 
# File 'lib/ruby2ruby.rb', line 340

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

#process_cvasgn(exp) ⇒ Object

:nodoc:



344
345
346
 
# File 'lib/ruby2ruby.rb', line 344

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

#process_cvdecl(exp) ⇒ Object

:nodoc:



348
349
350
 
# File 'lib/ruby2ruby.rb', line 348

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

#process_defined(exp) ⇒ Object

:nodoc:



352
353
354
 
# File 'lib/ruby2ruby.rb', line 352

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

#process_defn(exp) ⇒ Object

:nodoc:



356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
 
# File 'lib/ruby2ruby.rb', line 356

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

  # REFACTOR: use process_block but get it happier wrt parenthesize
  body = []
  until exp.empty? do
    body << process(exp.shift)
  end

  body << "# do nothing" if body.empty?
  body = body.join("\n")
  body = body.lines.to_a[1..-2].join("\n") if
    body =~ /^\Abegin/ && body =~ /^end\z/
  body = indent(body) unless body =~ /(^|\n)rescue/

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

#process_defs(exp) ⇒ Object

:nodoc:



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

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:



429
430
431
 
# File 'lib/ruby2ruby.rb', line 429

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

#process_dot3(exp) ⇒ Object

:nodoc:



433
434
435
 
# File 'lib/ruby2ruby.rb', line 433

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

#process_dregx(exp) ⇒ Object

:nodoc:



437
438
439
440
 
# File 'lib/ruby2ruby.rb', line 437

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:



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

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

#process_dstr(exp) ⇒ Object

:nodoc:



446
447
448
 
# File 'lib/ruby2ruby.rb', line 446

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

#process_dsym(exp) ⇒ Object

:nodoc:



450
451
452
 
# File 'lib/ruby2ruby.rb', line 450

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

#process_dxstr(exp) ⇒ Object

:nodoc:



454
455
456
 
# File 'lib/ruby2ruby.rb', line 454

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

#process_ensure(exp) ⇒ Object

:nodoc:



458
459
460
461
462
463
464
465
466
467
468
469
 
# File 'lib/ruby2ruby.rb', line 458

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:



471
472
473
 
# File 'lib/ruby2ruby.rb', line 471

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

#process_false(exp) ⇒ Object

:nodoc:



475
476
477
 
# File 'lib/ruby2ruby.rb', line 475

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

#process_flip2(exp) ⇒ Object

:nodoc:



479
480
481
 
# File 'lib/ruby2ruby.rb', line 479

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

#process_flip3(exp) ⇒ Object

:nodoc:



483
484
485
 
# File 'lib/ruby2ruby.rb', line 483

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

#process_for(exp) ⇒ Object

:nodoc:



487
488
489
490
491
492
493
494
495
496
497
 
# File 'lib/ruby2ruby.rb', line 487

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:



499
500
501
 
# File 'lib/ruby2ruby.rb', line 499

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

#process_gvar(exp) ⇒ Object

:nodoc:



503
504
505
 
# File 'lib/ruby2ruby.rb', line 503

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

#process_hash(exp) ⇒ Object

:nodoc:



507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
 
# File 'lib/ruby2ruby.rb', line 507

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

  until exp.empty?
    s = exp.shift
    t = s.sexp_type
    lhs = process s

    case t
    when :kwsplat then
      result << lhs
    else
      rhs = exp.shift
      t = rhs.first
      rhs = process rhs
      rhs = "(#{rhs})" unless HASH_VAL_NO_PAREN.include? t

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

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

#process_iasgn(exp) ⇒ Object

:nodoc:



531
532
533
534
535
536
537
538
 
# File 'lib/ruby2ruby.rb', line 531

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:



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
573
574
 
# File 'lib/ruby2ruby.rb', line 540

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:



576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
 
# File 'lib/ruby2ruby.rb', line 576

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
           " |#{process(args)[1..-2]}|"
         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:



621
622
623
 
# File 'lib/ruby2ruby.rb', line 621

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

#process_kwsplat(exp) ⇒ Object 



625
626
627
 
# File 'lib/ruby2ruby.rb', line 625

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

#process_lasgn(exp) ⇒ Object

:nodoc:



629
630
631
632
633
 
# File 'lib/ruby2ruby.rb', line 629

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

#process_lit(exp) ⇒ Object

:nodoc:



635
636
637
638
639
640
641
642
643
 
# File 'lib/ruby2ruby.rb', line 635

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:



645
646
647
 
# File 'lib/ruby2ruby.rb', line 645

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

#process_masgn(exp) ⇒ Object

:nodoc:



649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
 
# File 'lib/ruby2ruby.rb', line 649

def process_masgn(exp) # :nodoc:
  # s(:masgn, s(:array, s(:lasgn, :var), ...), s(:to_ary, <val>, ...))
  # s(:iter, <call>, s(:args, s(:masgn, :a, :b)), <body>)

  case exp.first
  when Sexp then
    lhs = exp.shift
    rhs = exp.empty? ? nil : exp.shift

    case lhs.first
    when :array then
      lhs.shift # node type
      lhs = lhs.map do |l|
        case l.first
        when :masgn then
          "(#{process(l)})"
        else
          process(l)
        end
      end
    else
      raise "no clue: #{lhs.inspect}"
    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
  when Symbol then # block arg list w/ masgn
    result = exp.join ", "
    exp.clear
    "(#{result})"
  else
    raise "unknown masgn: #{exp.inspect}"
  end
end

#process_match(exp) ⇒ Object

:nodoc:



690
691
692
 
# File 'lib/ruby2ruby.rb', line 690

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

#process_match2(exp) ⇒ Object

:nodoc:



694
695
696
697
698
 
# File 'lib/ruby2ruby.rb', line 694

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

#process_match3(exp) ⇒ Object

:nodoc:



700
701
702
703
704
705
706
707
708
709
710
 
# File 'lib/ruby2ruby.rb', line 700

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:



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

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

#process_next(exp) ⇒ Object

:nodoc:



716
717
718
719
720
721
722
723
 
# File 'lib/ruby2ruby.rb', line 716

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:



725
726
727
 
# File 'lib/ruby2ruby.rb', line 725

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

#process_not(exp) ⇒ Object

:nodoc:



729
730
731
 
# File 'lib/ruby2ruby.rb', line 729

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

#process_nth_ref(exp) ⇒ Object

:nodoc:



733
734
735
 
# File 'lib/ruby2ruby.rb', line 733

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

#process_op_asgn1(exp) ⇒ Object

:nodoc:



737
738
739
740
741
742
743
744
745
 
# File 'lib/ruby2ruby.rb', line 737

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:



747
748
749
750
751
752
753
754
755
756
 
# File 'lib/ruby2ruby.rb', line 747

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:



758
759
760
761
762
763
 
# File 'lib/ruby2ruby.rb', line 758

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:



765
766
767
768
769
770
 
# File 'lib/ruby2ruby.rb', line 765

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:



772
773
774
 
# File 'lib/ruby2ruby.rb', line 772

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

#process_postexe(exp) ⇒ Object

:nodoc:



776
777
778
 
# File 'lib/ruby2ruby.rb', line 776

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

#process_redo(exp) ⇒ Object

:nodoc:



780
781
782
 
# File 'lib/ruby2ruby.rb', line 780

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

#process_resbody(exp) ⇒ Object

:nodoc:



784
785
786
787
788
789
790
791
792
793
794
795
796
 
# File 'lib/ruby2ruby.rb', line 784

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:



798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
 
# File 'lib/ruby2ruby.rb', line 798

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.size <= 3 &&
    !exp.resbody.block &&
    !exp.resbody.return

  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:



825
826
827
 
# File 'lib/ruby2ruby.rb', line 825

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

#process_return(exp) ⇒ Object

:nodoc:



829
830
831
832
833
834
835
836
837
 
# File 'lib/ruby2ruby.rb', line 829

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_safe_attrasgn(exp) ⇒ Object

:nodoc:



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

def process_safe_attrasgn(exp) # :nodoc:
  receiver = process exp.shift
  name = exp.shift
  rhs  = exp.pop
  args = exp.pop # should be nil
  exp.clear

  raise "dunno what to do: #{args.inspect}" if args

  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

#process_safe_call(exp) ⇒ Object

:nodoc:



287
288
289
 
# File 'lib/ruby2ruby.rb', line 287

def process_safe_call(exp) # :nodoc:
  process_call(exp, :safe)
end

#process_sclass(exp) ⇒ Object

:nodoc:



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

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

#process_self(exp) ⇒ Object

:nodoc:



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

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

#process_splat(exp) ⇒ Object

:nodoc:



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

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

#process_str(exp) ⇒ Object

:nodoc:



873
874
875
 
# File 'lib/ruby2ruby.rb', line 873

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

#process_super(exp) ⇒ Object

:nodoc:



877
878
879
880
881
 
# File 'lib/ruby2ruby.rb', line 877

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

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

#process_svalue(exp) ⇒ Object

:nodoc:



883
884
885
886
887
888
889
 
# File 'lib/ruby2ruby.rb', line 883

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

#process_to_ary(exp) ⇒ Object

:nodoc:



891
892
893
 
# File 'lib/ruby2ruby.rb', line 891

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

#process_true(exp) ⇒ Object

:nodoc:



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

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

#process_undef(exp) ⇒ Object

:nodoc:



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

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

#process_until(exp) ⇒ Object

:nodoc:



903
904
905
 
# File 'lib/ruby2ruby.rb', line 903

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

#process_valias(exp) ⇒ Object

:nodoc:



907
908
909
 
# File 'lib/ruby2ruby.rb', line 907

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

#process_when(exp) ⇒ Object

:nodoc:



911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
 
# File 'lib/ruby2ruby.rb', line 911

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:



930
931
932
 
# File 'lib/ruby2ruby.rb', line 930

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

#process_xstr(exp) ⇒ Object

:nodoc:



934
935
936
 
# File 'lib/ruby2ruby.rb', line 934

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

#process_yield(exp) ⇒ Object

:nodoc:



938
939
940
941
942
943
944
945
946
947
948
949
 
# File 'lib/ruby2ruby.rb', line 938

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:



951
952
953
 
# File 'lib/ruby2ruby.rb', line 951

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

#re_opt(options) ⇒ Object

Return the appropriate regexp flags for a given numeric code.



1083
1084
1085
1086
1087
 
# File 'lib/ruby2ruby.rb', line 1083

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:



958
959
960
961
962
963
964
965
 
# File 'lib/ruby2ruby.rb', line 958

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:



967
968
969
970
 
# File 'lib/ruby2ruby.rb', line 967

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

#rewrite_resbody(exp) ⇒ Object

:nodoc:



972
973
974
975
976
977
 
# File 'lib/ruby2ruby.rb', line 972

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:



979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
 
# File 'lib/ruby2ruby.rb', line 979

def rewrite_rescue exp # :nodoc:
  complex = false
  complex ||= exp.size > 3
  complex ||= exp.resbody.block
  complex ||= exp.resbody.size > 3
  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:



995
996
997
998
999
1000
1001
1002
1003
1004
 
# File 'lib/ruby2ruby.rb', line 995

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.



1092
1093
1094
 
# File 'lib/ruby2ruby.rb', line 1092

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

#util_dthing(type, exp) ⇒ Object

Utility method to generate something interpolated.



1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
 
# File 'lib/ruby2ruby.rb', line 1099

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.



1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
 
# File 'lib/ruby2ruby.rb', line 1128

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