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
|
" Test for lambda and closure
func Test_lambda_feature()
call assert_equal(1, has('lambda'))
endfunc
func Test_lambda_with_filter()
let s:x = 2
call assert_equal([2, 3], filter([1, 2, 3], {i, v -> v >= s:x}))
endfunc
func Test_lambda_with_map()
let s:x = 1
call assert_equal([2, 3, 4], map([1, 2, 3], {i, v -> v + s:x}))
endfunc
func Test_lambda_with_sort()
call assert_equal([1, 2, 3, 4, 7], sort([3,7,2,1,4], {a, b -> a - b}))
endfunc
func Test_lambda_with_timer()
if !has('timers')
return
endif
let s:n = 0
let s:timer_id = 0
func! s:Foo()
let s:timer_id = timer_start(10, {-> execute("let s:n += 1 | echo s:n", "")}, {"repeat": -1})
endfunc
call s:Foo()
" check timer works
for i in range(0, 10)
if s:n > 0
break
endif
sleep 10m
endfor
" do not collect lambda
call test_garbagecollect_now()
" check timer still works
let m = s:n
for i in range(0, 10)
if s:n > m
break
endif
sleep 10m
endfor
call timer_stop(s:timer_id)
call assert_true(s:n > m)
endfunc
func Test_lambda_with_partial()
let l:Cb = function({... -> ['zero', a:1, a:2, a:3]}, ['one', 'two'])
call assert_equal(['zero', 'one', 'two', 'three'], l:Cb('three'))
endfunc
function Test_lambda_fails()
call assert_equal(3, {a, b -> a + b}(1, 2))
call assert_fails('echo {a, a -> a + a}(1, 2)', 'E853:')
call assert_fails('echo {a, b -> a + b)}(1, 2)', 'E15:')
endfunc
func Test_not_lamda()
let x = {'>' : 'foo'}
call assert_equal('foo', x['>'])
endfunc
func Test_lambda_capture_by_reference()
let v = 1
let l:F = {x -> x + v}
let v = 2
call assert_equal(12, l:F(10))
endfunc
func Test_lambda_side_effect()
func! s:update_and_return(arr)
let a:arr[1] = 5
return a:arr
endfunc
func! s:foo(arr)
return {-> s:update_and_return(a:arr)}
endfunc
let arr = [3,2,1]
call assert_equal([3, 5, 1], s:foo(arr)())
endfunc
func Test_lambda_refer_local_variable_from_other_scope()
func! s:foo(X)
return a:X() " refer l:x in s:bar()
endfunc
func! s:bar()
let x = 123
return s:foo({-> x})
endfunc
call assert_equal(123, s:bar())
endfunc
func Test_lambda_do_not_share_local_variable()
func! s:define_funcs()
let l:One = {-> split(execute("let a = 'abc' | echo a"))[0]}
let l:Two = {-> exists("a") ? a : "no"}
return [l:One, l:Two]
endfunc
let l:F = s:define_funcs()
call assert_equal('no', l:F[1]())
call assert_equal('abc', l:F[0]())
call assert_equal('no', l:F[1]())
endfunc
func Test_lambda_closure_counter()
func! s:foo()
let x = 0
return {-> [execute("let x += 1"), x][-1]}
endfunc
let l:F = s:foo()
call test_garbagecollect_now()
call assert_equal(1, l:F())
call assert_equal(2, l:F())
call assert_equal(3, l:F())
call assert_equal(4, l:F())
endfunc
func Test_lambda_with_a_var()
func! s:foo()
let x = 2
return {... -> a:000 + [x]}
endfunc
func! s:bar()
return s:foo()(1)
endfunc
call assert_equal([1, 2], s:bar())
endfunc
func Test_lambda_call_lambda_from_lambda()
func! s:foo(x)
let l:F1 = {-> {-> a:x}}
return {-> l:F1()}
endfunc
let l:F = s:foo(1)
call assert_equal(1, l:F()())
endfunc
func Test_lambda_delfunc()
func! s:gen()
let pl = l:
let l:Foo = {-> get(pl, "Foo", get(pl, "Bar", {-> 0}))}
let l:Bar = l:Foo
delfunction l:Foo
return l:Bar
endfunc
let l:F = s:gen()
call assert_fails(':call l:F()', 'E933:')
endfunc
func Test_lambda_scope()
func! s:NewCounter()
let c = 0
return {-> [execute('let c += 1'), c][-1]}
endfunc
func! s:NewCounter2()
return {-> [execute('let c += 100'), c][-1]}
endfunc
let l:C = s:NewCounter()
let l:D = s:NewCounter2()
call assert_equal(1, l:C())
call assert_fails(':call l:D()', 'E121:')
call assert_equal(2, l:C())
endfunc
func Test_lambda_share_scope()
func! s:New()
let c = 0
let l:Inc0 = {-> [execute('let c += 1'), c][-1]}
let l:Dec0 = {-> [execute('let c -= 1'), c][-1]}
return [l:Inc0, l:Dec0]
endfunc
let [l:Inc, l:Dec] = s:New()
call assert_equal(1, l:Inc())
call assert_equal(2, l:Inc())
call assert_equal(1, l:Dec())
endfunc
func Test_lambda_circular_reference()
func! s:Foo()
let d = {}
let d.f = {-> d}
return d.f
endfunc
call s:Foo()
call test_garbagecollect_now()
let i = 0 | while i < 10000 | call s:Foo() | let i+= 1 | endwhile
call test_garbagecollect_now()
endfunc
func Test_lambda_combination()
call assert_equal(2, {x -> {x -> x}}(1)(2))
call assert_equal(10, {y -> {x -> x(y)(10)}({y -> y})}({z -> z}))
call assert_equal(5.0, {x -> {y -> x / y}}(10)(2.0))
call assert_equal(6, {x -> {y -> {z -> x + y + z}}}(1)(2)(3))
call assert_equal(6, {x -> {f -> f(x)}}(3)({x -> x * 2}))
call assert_equal(6, {f -> {x -> f(x)}}({x -> x * 2})(3))
" Z combinator
let Z = {f -> {x -> f({y -> x(x)(y)})}({x -> f({y -> x(x)(y)})})}
let Fact = {f -> {x -> x == 0 ? 1 : x * f(x - 1)}}
call assert_equal(120, Z(Fact)(5))
endfunc
func Test_closure_counter()
func! s:foo()
let x = 0
func! s:bar() closure
let x += 1
return x
endfunc
return function('s:bar')
endfunc
let l:F = s:foo()
call test_garbagecollect_now()
call assert_equal(1, l:F())
call assert_equal(2, l:F())
call assert_equal(3, l:F())
call assert_equal(4, l:F())
endfunc
func Test_closure_unlet()
func! s:foo()
let x = 1
func! s:bar() closure
unlet x
endfunc
call s:bar()
return l:
endfunc
call assert_false(has_key(s:foo(), 'x'))
call test_garbagecollect_now()
endfunc
func LambdaFoo()
let x = 0
func! LambdaBar() closure
let x += 1
return x
endfunc
return function('LambdaBar')
endfunc
func Test_closure_refcount()
let g:Count = LambdaFoo()
call test_garbagecollect_now()
call assert_equal(1, g:Count())
let g:Count2 = LambdaFoo()
call test_garbagecollect_now()
call assert_equal(1, g:Count2())
call assert_equal(2, g:Count())
call assert_equal(3, g:Count2())
delfunc LambdaFoo
delfunc LambdaBar
endfunc
func Test_named_function_closure()
func! Afoo()
let x = 14
func! s:Abar() closure
return x
endfunc
call assert_equal(14, s:Abar())
endfunc
call Afoo()
call assert_equal(14, s:Abar())
call test_garbagecollect_now()
call assert_equal(14, s:Abar())
endfunc
func Test_lambda_with_index()
let List = {x -> [x]}
let Extract = {-> function(List, ['foobar'])()[0]}
call assert_equal('foobar', Extract())
endfunc
|
