1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
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
59
60
61
62
63
64
65
66
67
68
69
70
71
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
106
107
108
109
110
111
112
113
114
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
142
143
144
145
146
147
148
149
150
151
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
179
180
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
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
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
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
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
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
375
376
377
378
379
380
381
382
383
384
385
386
|
require 'test/unit'
class TestEnumerator < Test::Unit::TestCase
def setup
@obj = Object.new
class << @obj
include Enumerable
def foo(*a)
a.each {|x| yield x }
end
end
end
def enum_test obj
i = 0
obj.map{|e|
e
}.sort
end
def test_iterators
assert_equal [0, 1, 2], enum_test(3.times)
assert_equal [:x, :y, :z], enum_test([:x, :y, :z].each)
assert_equal [[:x, 1], [:y, 2]], enum_test({:x=>1, :y=>2})
end
## Enumerator as Iterator
def test_next
e = 3.times
3.times{|i|
assert_equal i, e.next
}
assert_raise(StopIteration){e.next}
end
def test_loop
e = 3.times
i = 0
loop{
assert_equal(i, e.next)
i += 1
}
end
def test_nested_iteration
def (o = Object.new).each
yield :ok1
yield [:ok2, :x].each.next
end
e = o.to_enum
assert_equal :ok1, e.next
assert_equal :ok2, e.next
assert_raise(StopIteration){e.next}
end
def test_initialize
assert_equal([1, 2, 3], @obj.to_enum(:foo, 1, 2, 3).to_a)
assert_equal([1, 2, 3], Enumerator.new(@obj, :foo, 1, 2, 3).to_a)
assert_equal([1, 2, 3], Enumerator.new { |y| i = 0; loop { y << (i += 1) } }.take(3))
assert_raise(ArgumentError) { Enumerator.new }
end
def test_initialize_copy
assert_equal([1, 2, 3], @obj.to_enum(:foo, 1, 2, 3).dup.to_a)
e = @obj.to_enum(:foo, 1, 2, 3)
assert_nothing_raised { assert_equal(1, e.next) }
assert_raise(TypeError) { e.dup }
e = Enumerator.new { |y| i = 0; loop { y << (i += 1) } }.dup
assert_nothing_raised { assert_equal(1, e.next) }
assert_raise(TypeError) { e.dup }
end
def test_gc
assert_nothing_raised do
1.times do
foo = [1,2,3].to_enum
GC.start
end
GC.start
end
end
def test_slice
assert_equal([[1,2,3],[4,5,6],[7,8,9],[10]], (1..10).each_slice(3).to_a)
end
def test_cons
a = [[1,2,3], [2,3,4], [3,4,5], [4,5,6], [5,6,7], [6,7,8], [7,8,9], [8,9,10]]
assert_equal(a, (1..10).each_cons(3).to_a)
end
def test_with_index
assert_equal([[1,0],[2,1],[3,2]], @obj.to_enum(:foo, 1, 2, 3).with_index.to_a)
assert_equal([[1,5],[2,6],[3,7]], @obj.to_enum(:foo, 1, 2, 3).with_index(5).to_a)
end
def test_with_object
obj = [0, 1]
ret = (1..10).each.with_object(obj) {|i, memo|
memo[0] += i
memo[1] *= i
}
assert_same(obj, ret)
assert_equal([55, 3628800], ret)
a = [2,5,2,1,5,3,4,2,1,0]
obj = {}
ret = a.delete_if.with_object(obj) {|i, seen|
if seen.key?(i)
true
else
seen[i] = true
false
end
}
assert_same(obj, ret)
assert_equal([2, 5, 1, 3, 4, 0], a)
end
def test_next_rewind
e = @obj.to_enum(:foo, 1, 2, 3)
assert_equal(1, e.next)
assert_equal(2, e.next)
e.rewind
assert_equal(1, e.next)
assert_equal(2, e.next)
assert_equal(3, e.next)
assert_raise(StopIteration) { e.next }
end
def test_peek
a = [1]
e = a.each
assert_equal(1, e.peek)
assert_equal(1, e.peek)
assert_equal(1, e.next)
assert_raise(StopIteration) { e.peek }
assert_raise(StopIteration) { e.peek }
end
def test_peek_modify
o = Object.new
def o.each
yield 1,2
end
e = o.to_enum
a = e.peek
a << 3
assert_equal([1,2], e.peek)
end
def test_peek_values_modify
o = Object.new
def o.each
yield 1,2
end
e = o.to_enum
a = e.peek_values
a << 3
assert_equal([1,2], e.peek)
end
def test_next_after_stopiteration
a = [1]
e = a.each
assert_equal(1, e.next)
assert_raise(StopIteration) { e.next }
assert_raise(StopIteration) { e.next }
e.rewind
assert_equal(1, e.next)
assert_raise(StopIteration) { e.next }
assert_raise(StopIteration) { e.next }
end
def test_stop_result
a = [1]
res = a.each {}
e = a.each
assert_equal(1, e.next)
exc = assert_raise(StopIteration) { e.next }
assert_equal(res, exc.result)
end
def test_next_values
o = Object.new
def o.each
yield
yield 1
yield 1, 2
end
e = o.to_enum
assert_equal(nil, e.next)
assert_equal(1, e.next)
assert_equal([1,2], e.next)
e = o.to_enum
assert_equal([], e.next_values)
assert_equal([1], e.next_values)
assert_equal([1,2], e.next_values)
end
def test_peek_values
o = Object.new
def o.each
yield
yield 1
yield 1, 2
end
e = o.to_enum
assert_equal(nil, e.peek)
assert_equal(nil, e.next)
assert_equal(1, e.peek)
assert_equal(1, e.next)
assert_equal([1,2], e.peek)
assert_equal([1,2], e.next)
e = o.to_enum
assert_equal([], e.peek_values)
assert_equal([], e.next_values)
assert_equal([1], e.peek_values)
assert_equal([1], e.next_values)
assert_equal([1,2], e.peek_values)
assert_equal([1,2], e.next_values)
e = o.to_enum
assert_equal([], e.peek_values)
assert_equal(nil, e.next)
assert_equal([1], e.peek_values)
assert_equal(1, e.next)
assert_equal([1,2], e.peek_values)
assert_equal([1,2], e.next)
e = o.to_enum
assert_equal(nil, e.peek)
assert_equal([], e.next_values)
assert_equal(1, e.peek)
assert_equal([1], e.next_values)
assert_equal([1,2], e.peek)
assert_equal([1,2], e.next_values)
end
def test_feed
o = Object.new
def o.each(ary)
ary << yield
ary << yield
ary << yield
end
ary = []
e = o.to_enum(:each, ary)
e.next
e.feed 1
e.next
e.feed 2
e.next
e.feed 3
assert_raise(StopIteration) { e.next }
assert_equal([1,2,3], ary)
end
def test_feed_mixed
o = Object.new
def o.each(ary)
ary << yield
ary << yield
ary << yield
end
ary = []
e = o.to_enum(:each, ary)
e.next
e.feed 1
e.next
e.next
e.feed 3
assert_raise(StopIteration) { e.next }
assert_equal([1,nil,3], ary)
end
def test_feed_twice
o = Object.new
def o.each(ary)
ary << yield
ary << yield
ary << yield
end
ary = []
e = o.to_enum(:each, ary)
e.feed 1
assert_raise(TypeError) { e.feed 2 }
end
def test_feed_before_first_next
o = Object.new
def o.each(ary)
ary << yield
ary << yield
ary << yield
end
ary = []
e = o.to_enum(:each, ary)
e.feed 1
e.next
e.next
assert_equal([1], ary)
end
def test_rewind_clear_feed
o = Object.new
def o.each(ary)
ary << yield
ary << yield
ary << yield
end
ary = []
e = o.to_enum(:each, ary)
e.next
e.feed 1
e.next
e.feed 2
e.rewind
e.next
e.next
assert_equal([1,nil], ary)
end
def test_feed_yielder
x = nil
e = Enumerator.new {|y| x = y.yield; 10 }
e.next
e.feed 100
exc = assert_raise(StopIteration) { e.next }
assert_equal(100, x)
assert_equal(10, exc.result)
end
def test_inspect
e = (0..10).each_cons(2)
assert_equal("#<Enumerator: 0..10:each_cons(2)>", e.inspect)
e = Enumerator.new {|y| x = y.yield; 10 }
assert_match(/\A#<Enumerator: .*:each>/, e.inspect)
a = []
e = a.each_with_object(a)
a << e
assert_equal("#<Enumerator: [#<Enumerator: ...>]:each_with_object([#<Enumerator: ...>])>",
e.inspect)
end
def test_generator
# note: Enumerator::Generator is a class just for internal
g = Enumerator::Generator.new {|y| y << 1 << 2 << 3; :foo }
g2 = g.dup
a = []
assert_equal(:foo, g.each {|x| a << x })
assert_equal([1, 2, 3], a)
a = []
assert_equal(:foo, g2.each {|x| a << x })
assert_equal([1, 2, 3], a)
end
def test_yielder
# note: Enumerator::Yielder is a class just for internal
a = []
y = Enumerator::Yielder.new {|x| a << x }
assert_equal(y, y << 1 << 2 << 3)
assert_equal([1, 2, 3], a)
a = []
y = Enumerator::Yielder.new {|x| a << x }
assert_equal([1], y.yield(1))
assert_equal([1, 2], y.yield(2))
assert_equal([1, 2, 3], y.yield(3))
assert_raise(LocalJumpError) { Enumerator::Yielder.new }
end
def test_peek_for_enumerator_objects
e = 2.times
assert_equal(0, e.peek)
e.next
assert_equal(1, e.peek)
e.next
assert_raise(StopIteration) { e.peek }
end
end
|
