Module: UnifiedRuby

Included in:
PostUnifier
Defined in:
lib/parsetree/lib/unified_ruby.rb

Instance Method Summary collapse

Instance Method Details

#process(exp) ⇒ Object 



7
8
9
10
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 7

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

#rewrite_argscat(exp) ⇒ Object 



12
13
14
15
16
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 12

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

#rewrite_argspush(exp) ⇒ Object 



18
19
20
21
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 18

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

#rewrite_attrasgn(exp) ⇒ Object 



23
24
25
26
27
28
29
30
31
32
33
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 23

def rewrite_attrasgn(exp)
  last = exp.last

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

  exp
end

#rewrite_begin(exp) ⇒ Object 



35
36
37
38
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 35

def rewrite_begin(exp)
  raise "wtf: #{exp.inspect}" if exp.size > 2
  exp.last
end

#rewrite_block_pass(exp) ⇒ Object 



40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 40

def rewrite_block_pass exp
  case exp.size
  when 2 then
    _, block = exp
    case block.first
    when :lasgn then
      block[-1] = :"&#{block[-1]}"
      exp = block
    else
      raise "huh?: #{block.inspect}"
    end
  when 3 then
    _, block, recv = exp
    case recv.first
    when :super then
      recv << s(:block_pass, block)
      exp = recv
    when :call then
      recv.last << s(:block_pass, block)
      exp = recv
    when :masgn then
      block[-1] = :"&#{block[-1]}"
      recv.last << block
      exp = recv
    else
      raise "huh?: #{recv.inspect}"
    end
  end

  exp
end

#rewrite_bmethod(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
101
102
103
104
105
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 72

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

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

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

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

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

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

  s(:scope, body)
end

#rewrite_call(exp) ⇒ Object 



122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 122

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

  exp << s(:arglist)

  exp
end

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



144
145
146
147
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 144

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

#rewrite_defn(exp) ⇒ Object

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

1) From:

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

to:

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

2) From:

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

to:

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

3) From:

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

to:

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



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
214
215
216
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 182

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

  weirdo ||= fbody.cfunc if fbody

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

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

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

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

  exp
end

#rewrite_defs(exp) ⇒ Object 



218
219
220
221
222
223
224
225
226
227
228
229
230
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 218

def rewrite_defs(exp)
  receiver = exp.delete_at 1

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

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

  result
end

#rewrite_dmethod(exp) ⇒ Object 



232
233
234
235
236
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 232

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

#rewrite_dvar(exp) ⇒ Object 



238
239
240
241
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 238

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

#rewrite_fcall(exp) ⇒ Object 



243
244
245
246
247
248
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 243

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

  rewrite_call(exp)
end

#rewrite_flip2(exp) ⇒ Object Also known as: rewrite_flip3 



250
251
252
253
254
255
256
257
258
259
260
261
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 250

def rewrite_flip2(exp)
  # from:
  # s(:flip2,
  #   s(:call, s(:lit, 1), :==, s(:arglist, s(:gvar, :$.))),
  #   s(:call, s(:lit, 2), :a?, s(:arglist, s(:call, nil, :b, s(:arglist)))))
  # to:
  # s(:flip2,
  #   s(:lit, 1),
  #   s(:call, s(:lit, 2), :a?, s(:arglist, s(:call, nil, :b, s(:arglist)))))
  exp[1] = exp[1][1] if exp[1][0] == :call && exp[1][1][0] == :lit
  exp
end

#rewrite_iter(exp) ⇒ Object 



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

def rewrite_iter(exp)
  t, recv, args, body = exp

  # unwrap masgn args if there is only 1 thing to assign and it isn't splat
  if Sexp === args and args.sexp_type == :masgn and args.array.size == 2 then
    if args.array.last.sexp_type != :splat then
      args = args.array.last
    end
  end

  r = s(t, recv, args, body)
  r.delete_at 3 unless body # HACK omg this sucks
  r
end

#rewrite_masgn(exp) ⇒ Object 



265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 265

def rewrite_masgn(exp)
  t, lhs, lhs_splat, rhs = exp

  lhs ||= s(:array)

  if lhs_splat then
    case lhs_splat.first
    when :array then
      lhs_splat = lhs_splat.last if lhs_splat.last.first == :splat
    when :splat then
      # do nothing
    else
      lhs_splat = s(:splat, lhs_splat)
    end
    lhs << lhs_splat
  end

  # unwrap RHS from array IF it is only a splat node
  rhs = rhs.last if rhs && # TODO: rhs.structure =~ s(:array, s(:splat))
    rhs.size == 2 && rhs.structure.flatten.first(2) == [:array, :splat]

  s(t, lhs, rhs).compact
end

#rewrite_op_asgn1(exp) ⇒ Object 



289
290
291
292
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 289

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

#rewrite_resbody(exp) ⇒ Object 



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

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

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

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

  exp
end

#rewrite_rescue(exp) ⇒ Object 



313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 313

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

  resbodies = []

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

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

  resbodies << els if els

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

#rewrite_splat(exp) ⇒ Object 



343
344
345
346
347
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 343

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

#rewrite_super(exp) ⇒ Object 



349
350
351
352
353
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 349

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

#rewrite_vcall(exp) ⇒ Object 



355
356
357
358
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 355

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

#rewrite_yield(exp) ⇒ Object 



360
361
362
363
364
365
366
367
368
369
370
371
372
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 360

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

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

  exp
end

#rewrite_zarray(exp) ⇒ Object 



374
375
376
377
 
# File 'lib/parsetree/lib/unified_ruby.rb', line 374

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