Class: Antlr4::Runtime::Array2DHashSet

Inherits:
Object
  • Object
show all
Defined in:
lib/antlr4/runtime/array_2d_hash_set.rb

Defined Under Namespace

Classes: SetIterator

Constant Summary collapse

INITIAL_CAPACITY =

must be power of 2

32
INITIAL_BUCKET_CAPACITY = 
4
LOAD_FACTOR = 
0.75

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(comparator = nil, initial_capacity = INITIAL_CAPACITY, initial_bucket_capacity = INITIAL_BUCKET_CAPACITY) ⇒ Array2DHashSet

Returns a new instance of Array2DHashSet.



10
11
12
13
14
15
16
17
18
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 10

def initialize(comparator = nil, initial_capacity = INITIAL_CAPACITY, initial_bucket_capacity = INITIAL_BUCKET_CAPACITY)
  comparator.nil? ? @comparator = ObjectEqualityComparator.instance : @comparator = comparator

  @n_elements = 0
  @initial_bucket_capacity = initial_bucket_capacity
  @threshold = (initial_bucket_capacity * LOAD_FACTOR).floor # when to expand
  @current_prime = 1 # jump by 4 primes each expand or whatever
  @buckets = create_buckets(initial_capacity)
end

Instance Attribute Details

#buckets ⇒ Object (readonly)

Returns the value of attribute buckets.



8
9
10
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 8

def buckets
  @buckets
end

Instance Method Details

#==(o) ⇒ Object 



114
115
116
117
118
119
120
121
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 114

def ==(o)
  return true if o.equal?(self)
  return false unless o.is_a? Array2DHashSet

  return false if o.size != size

  contains_all(o)
end

#add(t) ⇒ Object 



123
124
125
126
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 123

def add(t)
  existing = get_or_add(t)
  existing == t
end

#add_all(c) ⇒ Object 



246
247
248
249
250
251
252
253
254
255
256
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 246

def add_all(c)
  changed = false
  i = 0
  while i < c.length
    o = c[i]
    existing = get_or_add(o)
    changed = true if existing != o
    i += 1
  end
  changed
end

#clear ⇒ Object 



313
314
315
316
317
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 313

def clear
  @buckets = create_buckets(INITIAL_CAPACITY)
  @n_elements = 0
  @threshold = (INITIAL_CAPACITY * LOAD_FACTOR).floor
end

#contains(o) ⇒ Object 



136
137
138
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 136

def contains(o)
  contains_fast(o)
end

#contains_all(s) ⇒ Object 



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
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 213

def contains_all(s)
  if s.is_a? Array2DHashSet
    i = 0
    while i < s.buckets.length
      bucket = s.buckets[i]
      if bucket.nil?
        i += 1
        next
      end

      j = 0
      while j < bucket.length
        o = bucket[j]
        if o.nil?
          j += 1
          next
        end
        return false unless contains_fast(o)
        j += 1
      end
      i += 1
    end
  else
    i = 0
    while i < s.length
      o = s[i]
      return false unless contains_fast(o)
      i += 1
    end
  end
  true
end

#contains_fast(obj) ⇒ Object 



140
141
142
143
144
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 140

def contains_fast(obj)
  return false if obj.nil?

  !get(obj).nil?
end

#create_bucket(capacity) ⇒ Object 



385
386
387
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 385

def create_bucket(capacity)
  Array.new(capacity)
end

#create_buckets(capacity) ⇒ Object 



381
382
383
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 381

def create_buckets(capacity)
  Array.new(capacity)
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


132
133
134
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 132

def empty?
  @n_elements == 0
end

#expand ⇒ Object

Raises:

  • (StandardError) 


418
419
420
421
422
423
424
425
426
427
428
429
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
462
463
464
465
466
467
468
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 418

def expand
  old = @buckets
  @current_prime += 4
  new_capacity = @buckets.length * 2
  new_table = create_buckets(new_capacity)
  new_bucket_lengths = Array.new(new_table.length, 0)
  @buckets = new_table
  @threshold = (new_capacity * LOAD_FACTOR).floor

  old_size = size
  j = 0
  while j < old.length
    bucket = old[j]
    if bucket.nil?
      j += 1
      next
    end

    k = 0
    while k < bucket.length
      o = bucket[k]
      break if o.nil?

      b = get_bucket(o)
      bucket_length = new_bucket_lengths[b]
      if bucket_length == 0
        new_bucket = create_bucket(@initial_bucket_capacity)
        new_table[b] = new_bucket
      else
        new_bucket = new_table[b]
        if bucket_length == new_bucket.length
          tmp = Array.new(new_bucket.length * 2)
          i = 0
          while i < new_bucket.length
            tmp[i] = new_bucket[i]
            i += 1
          end
          new_bucket = tmp
          new_table[b] = new_bucket
        end
      end

      new_bucket[bucket_length] = o
      new_bucket_lengths[b] += 1
      k += 1
    end
    j += 1
  end

  raise StandardError, '@nElements != oldSize' if @n_elements != old_size
end

#get(o) ⇒ Object 



60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 60

def get(o)
  return o if o.nil?

  b = get_bucket(o)
  bucket = @buckets[b]
  if bucket.nil?
    return nil # no bucket
  end

  i = 0
  while i < bucket.length
    e = bucket[i]
    if e.nil?
      i += 1
      next
    end
    return e if @comparator.compare(e, o).zero?
    i += 1
  end
  nil
end

#get_bucket(o) ⇒ Object 



82
83
84
85
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 82

def get_bucket(o)
  h = @comparator.hash(o)
  h & (@buckets.length - 1) # assumes len is power of 2
end

#get_or_add(o) ⇒ Object 



20
21
22
23
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 20

def get_or_add(o)
  expand if @n_elements > @threshold
  get_or_add_impl(o)
end

#get_or_add_impl(o) ⇒ Object 



25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 25

def get_or_add_impl(o)
  b = get_bucket(o)
  bucket = @buckets[b]

  if bucket.nil?
    bucket = create_bucket(@initial_bucket_capacity)
    bucket[0] = o
    @buckets[b] = bucket
    @n_elements += 1
    return o
  end

  # LOOK FOR IT IN BUCKET
  i = 0
  while i < bucket.length
    existing = bucket[i]
    if existing.nil? # empty slot not there, add.
      bucket[i] = o
      @n_elements += 1
      return o
    end
    if @comparator.compare(existing, o).zero?
      return existing # found existing, quit
    end

    i += 1
  end

  # FULL BUCKET, add to end
  @buckets[b] = bucket
  bucket << o # add to end
  @n_elements += 1
  o
end

#hash ⇒ Object 



87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 87

def hash
  objs = []
  i = 0
  while i < @buckets.length
    bucket = @buckets[i]
    if bucket.nil?
      i += 1
      next
    end

    j = 0
    while j < bucket.length
      o = bucket[j]
      if o.nil?
        j += 1
        next
      end

      objs << o
      j += 1
    end
    i += 1
  end

  @_hash = RumourHash.calculate(objs)
end

#iterator ⇒ Object 



146
147
148
149
150
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 146

def iterator
  a = to_a
  a.sort! {|x, y| @comparator.compare(x, y)} unless @comparator.nil?
  SetIterator.new(a, self)
end

#remove(o) ⇒ Object 



180
181
182
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 180

def remove(o)
  remove_fast(o)
end

#remove_all(c) ⇒ Object 



301
302
303
304
305
306
307
308
309
310
311
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 301

def remove_all(c)
  changed = false
  i = 0
  while i < c.length
    o = c[i]
    changed |= remove_fast(o)
    i += 1
  end

  changed
end

#remove_fast(obj) ⇒ Object 



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
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 184

def remove_fast(obj)
  return false if obj.nil?

  b = get_bucket(obj)
  bucket = @buckets[b]
  if bucket.nil?
    # no bucket
    return false
  end

  i = 0
  while i < bucket.length
    e = bucket[i]
    if e.nil?
      i += 1
      next
    end

    if @comparator.compare(e, obj).zero? # found it
      bucket[i] = nil
      @n_elements -= 1
      return true
    end
    i += 1
  end

  false
end

#retain_all(c) ⇒ Object 



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
286
287
288
289
290
291
292
293
294
295
296
297
298
299
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 258

def retain_all(c)
  newsize = 0
  k = 0
  while k < @buckets.length
    bucket = @buckets[k]
    if bucket.nil?
      k += 1
      next
    end

    i = 0
    j = 0
    while i < bucket.length
      if bucket[i].nil?
        i += 1
        next
      end

      if c.include?(bucket[i])
        # keep
        bucket[j] = bucket[i] if i != j

        j += 1
        newsize += 1
      end

      i += 1
    end

    newsize += j

    while j < i
      bucket[j] = nil
      j += 1
    end
    k += 1
  end

  changed = newsize != @n_elements
  @n_elements = newsize
  changed
end

#size ⇒ Object 



128
129
130
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 128

def size
  @n_elements
end

#to_a ⇒ Object 



152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 152

def to_a
  a = []
  i = 0
  j = 0
  while j < @buckets.length
    bucket = @buckets[j]
    if bucket.nil?
      j += 1
      next
    end

    k = 0
    while k < bucket.length
      o = bucket[k]
      if o.nil?
        k += 1
        next
      end

      a << o
      i += 1
      k += 1
    end
    j += 1
  end
  a
end

#to_s ⇒ Object 



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
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 319

def to_s
  return '{}' if size == 0

  buf = ''
  buf << '{'
  first = true
  items = to_a
  items.sort! {|a, b| @comparator.compare(a, b)} unless @comparator.nil?

  i = 0
  while i < items.length
    item = items[i]
    if item.nil?
      i += 1
      next
    end

    if first
      first = false
    else
      buf << ', '
    end
    buf << item.to_s

    i += 1
  end
  buf << '}'
  buf
end

#to_table_string ⇒ Object 



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
375
376
377
378
379
 
# File 'lib/antlr4/runtime/array_2d_hash_set.rb', line 349

def to_table_string
  buf = ''
  i = 0
  while i < @buckets.length
    bucket = @buckets[i]
    if bucket.nil?
      buf << "null\n"
    else
      buf << '['
      first = true
      j = 0
      while j < bucket.length
        o = bucket[j]
        if first
          first = false
        else
          buf << ' '
        end
        buf << if o.nil?
                 '_'
               else
                 o.to_s
               end
        j += 1
      end
      buf << "]\n"
    end
    i += 1
  end
  buf
end