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" 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 n = 0
let s:timer_id = timer_start(50, {-> execute("let s:n += 1 | echo s:n", "")}, {"repeat": -1})
endfunc
call s:Foo()
sleep 200ms
" do not collect lambda
call test_garbagecollect_now()
let m = s:n
sleep 200ms
call timer_stop(s:timer_id)
call assert_true(m > 1)
call assert_true(s:n > m + 1)
call assert_true(s:n < 9)
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
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