src/testdir/test_vim9_func.vim

" Test various aspects of the Vim9 script language.

source check.vim
source view_util.vim

" Check that "lines" inside ":def" results in an "error" message.
func CheckDefFailure(lines, error)
  call writefile(['def Func()'] + a:lines + ['enddef'], 'Xdef')
  call assert_fails('so Xdef', a:error, a:lines)
  call delete('Xdef')
endfunc

func CheckScriptFailure(lines, error)
  call writefile(a:lines, 'Xdef')
  call assert_fails('so Xdef', a:error, a:lines)
  call delete('Xdef')
endfunc

func Test_def_basic()
  def SomeFunc(): string
    return 'yes'
  enddef
  call assert_equal('yes', SomeFunc())
endfunc

def ReturnString(): string
  return 'string'
enddef

def ReturnNumber(): number
  return 123
enddef

let g:notNumber = 'string'

def ReturnGlobal(): number
  return g:notNumber
enddef

def Test_return_something()
  assert_equal('string', ReturnString())
  assert_equal(123, ReturnNumber())
  assert_fails('call ReturnGlobal()', 'E1029: Expected number but got string')
enddef

let s:nothing = 0
def ReturnNothing()
  s:nothing = 1
  if true
    return
  endif
  s:nothing = 2
enddef

def Test_return_nothing()
  ReturnNothing()
  assert_equal(1, s:nothing)
enddef

func Increment()
  let g:counter += 1
endfunc

def Test_call_ufunc_count()
  g:counter = 1
  Increment()
  Increment()
  Increment()
  " works with and without :call
  assert_equal(4, g:counter)
  call assert_equal(4, g:counter)
  unlet g:counter
enddef

def MyVarargs(arg: string, ...rest: list<string>): string
  let res = arg
  for s in rest
    res ..= ',' .. s
  endfor
  return res
enddef

def Test_call_varargs()
  assert_equal('one', MyVarargs('one'))
  assert_equal('one,two', MyVarargs('one', 'two'))
  assert_equal('one,two,three', MyVarargs('one', 'two', 'three'))
enddef

def MyDefaultArgs(name = 'string'): string
  return name
enddef

def Test_call_default_args()
  assert_equal('string', MyDefaultArgs())
  assert_equal('one', MyDefaultArgs('one'))
  assert_fails('call MyDefaultArgs("one", "two")', 'E118:')

  call CheckScriptFailure(['def Func(arg: number = asdf)', 'enddef'], 'E1001:')
enddef

func Test_call_default_args_from_func()
  call assert_equal('string', MyDefaultArgs())
  call assert_equal('one', MyDefaultArgs('one'))
  call assert_fails('call MyDefaultArgs("one", "two")', 'E118:')
endfunc

func TakesOneArg(arg)
  echo a:arg
endfunc

def Test_call_wrong_args()
  call CheckDefFailure(['TakesOneArg()'], 'E119:')
  call CheckDefFailure(['TakesOneArg(11, 22)'], 'E118:')
  call CheckDefFailure(['bufnr(xxx)'], 'E1001:')
enddef

" Default arg and varargs
def MyDefVarargs(one: string, two = 'foo', ...rest: list<string>): string
  let res = one .. ',' .. two
  for s in rest
    res ..= ',' .. s
  endfor
  return res
enddef

def Test_call_def_varargs()
  call assert_fails('call MyDefVarargs()', 'E119:')
  assert_equal('one,foo', MyDefVarargs('one'))
  assert_equal('one,two', MyDefVarargs('one', 'two'))
  assert_equal('one,two,three', MyDefVarargs('one', 'two', 'three'))
enddef

def Test_using_var_as_arg()
  call writefile(['def Func(x: number)',  'let x = 234', 'enddef'], 'Xdef')
  call assert_fails('so Xdef', 'E1006:')
  call delete('Xdef')
enddef

def Test_call_func_defined_later()
  call assert_equal('one', DefinedLater('one'))
  call assert_fails('call NotDefined("one")', 'E117:')
enddef

func DefinedLater(arg)
  return a:arg
endfunc

def FuncWithForwardCall()
  return DefinedEvenLater("yes")
enddef

def DefinedEvenLater(arg: string): string
  return arg
enddef

def Test_error_in_nested_function()
  " Error in called function requires unwinding the call stack.
  assert_fails('call FuncWithForwardCall()', 'E1029')
enddef

def Test_return_type_wrong()
  CheckScriptFailure(['def Func(): number', 'return "a"', 'enddef'], 'expected number but got string')
  CheckScriptFailure(['def Func(): string', 'return 1', 'enddef'], 'expected string but got number')
  CheckScriptFailure(['def Func(): void', 'return "a"', 'enddef'], 'expected void but got string')
  CheckScriptFailure(['def Func()', 'return "a"', 'enddef'], 'expected void but got string')

  CheckScriptFailure(['def Func(): number', 'return', 'enddef'], 'E1003:')

  CheckScriptFailure(['def Func(): list', 'return []', 'enddef'], 'E1008:')
  CheckScriptFailure(['def Func(): dict', 'return {}', 'enddef'], 'E1008:')
enddef

def Test_arg_type_wrong()
  CheckScriptFailure(['def Func3(items: list)', 'echo "a"', 'enddef'], 'E1008: Missing <type>')
enddef

def Test_vim9script_call()
  let lines =<< trim END
    vim9script
    let var = ''
    def MyFunc(arg: string)
       var = arg
    enddef
    MyFunc('foobar')
    assert_equal('foobar', var)

    let str = 'barfoo'
    str->MyFunc()
    assert_equal('barfoo', var)

    let g:value = 'value'
    g:value->MyFunc()
    assert_equal('value', var)

    let listvar = []
    def ListFunc(arg: list<number>)
       listvar = arg
    enddef
    [1, 2, 3]->ListFunc()
    assert_equal([1, 2, 3], listvar)

    let dictvar = {}
    def DictFunc(arg: dict<number>)
       dictvar = arg
    enddef
    {'a': 1, 'b': 2}->DictFunc()
    assert_equal(#{a: 1, b: 2}, dictvar)
    def CompiledDict()
      {'a': 3, 'b': 4}->DictFunc()
    enddef
    CompiledDict()
    assert_equal(#{a: 3, b: 4}, dictvar)

    #{a: 3, b: 4}->DictFunc()
    assert_equal(#{a: 3, b: 4}, dictvar)

    ('text')->MyFunc()
    assert_equal('text', var)
    ("some")->MyFunc()
    assert_equal('some', var)
  END
  writefile(lines, 'Xcall.vim')
  source Xcall.vim
  delete('Xcall.vim')
enddef

def Test_vim9script_call_fail_decl()
  let lines =<< trim END
    vim9script
    let var = ''
    def MyFunc(arg: string)
       let var = 123
    enddef
  END
  writefile(lines, 'Xcall_decl.vim')
  assert_fails('source Xcall_decl.vim', 'E1054:')
  delete('Xcall_decl.vim')
enddef

def Test_vim9script_call_fail_const()
  let lines =<< trim END
    vim9script
    const var = ''
    def MyFunc(arg: string)
       var = 'asdf'
    enddef
  END
  writefile(lines, 'Xcall_const.vim')
  assert_fails('source Xcall_const.vim', 'E46:')
  delete('Xcall_const.vim')
enddef

" Test that inside :function a Python function can be defined, :def is not
" recognized.
func Test_function_python()
  CheckFeature python3
  let py = 'python3'
  execute py "<< EOF"
def do_something():
  return 1
EOF
endfunc

def Test_delfunc()
  let lines =<< trim END
    vim9script
    def GoneSoon()
      echo 'hello'
    enddef

    def CallGoneSoon()
      GoneSoon()
    enddef

    delfunc GoneSoon
    CallGoneSoon()
  END
  writefile(lines, 'XToDelFunc')
  assert_fails('so XToDelFunc', 'E933')
  assert_fails('so XToDelFunc', 'E933')

  delete('XToDelFunc')
enddef

def Test_redef_failure()
  call writefile(['def Func0(): string',  'return "Func0"', 'enddef'], 'Xdef')
  so Xdef
  call writefile(['def Func1(): string',  'return "Func1"', 'enddef'], 'Xdef')
  so Xdef
  call writefile(['def! Func0(): string', 'enddef'], 'Xdef')
  call assert_fails('so Xdef', 'E1027:')
  call writefile(['def Func2(): string',  'return "Func2"', 'enddef'], 'Xdef')
  so Xdef
  call delete('Xdef')

  call assert_equal(0, Func0())
  call assert_equal('Func1', Func1())
  call assert_equal('Func2', Func2())

  delfunc! Func0
  delfunc! Func1
  delfunc! Func2
enddef

" Test for internal functions returning different types
func Test_InternalFuncRetType()
  let lines =<< trim END
    def RetFloat(): float
      return ceil(1.456)
    enddef

    def RetListAny(): list<any>
      return items({'k' : 'v'})
    enddef

    def RetListString(): list<string>
      return split('a:b:c', ':')
    enddef

    def RetListDictAny(): list<dict<any>>
      return getbufinfo()
    enddef

    def RetDictNumber(): dict<number>
      return wordcount()
    enddef

    def RetDictString(): dict<string>
      return environ()
    enddef
  END
  call writefile(lines, 'Xscript')
  source Xscript

  call assert_equal(2.0, RetFloat())
  call assert_equal([['k', 'v']], RetListAny())
  call assert_equal(['a', 'b', 'c'], RetListString())
  call assert_notequal([], RetListDictAny())
  call assert_notequal({}, RetDictNumber())
  call assert_notequal({}, RetDictString())
  call delete('Xscript')
endfunc

" Test for passing too many or too few arguments to internal functions
func Test_internalfunc_arg_error()
  let l =<< trim END
    def! FArgErr(): float
      return ceil(1.1, 2)
    enddef
  END
  call writefile(l, 'Xinvalidarg')
  call assert_fails('so Xinvalidarg', 'E118:')
  let l =<< trim END
    def! FArgErr(): float
      return ceil()
    enddef
  END
  call writefile(l, 'Xinvalidarg')
  call assert_fails('so Xinvalidarg', 'E119:')
  call delete('Xinvalidarg')
endfunc

let s:funcResult = 0

def FuncNoArgNoRet()
  funcResult = 11
enddef

def FuncNoArgRetNumber(): number
  funcResult = 22
  return 1234
enddef

def FuncOneArgNoRet(arg: number)
  funcResult = arg
enddef

def FuncOneArgRetNumber(arg: number): number
  funcResult = arg
  return arg
enddef

def Test_func_type()
  let Ref1: func()
  funcResult = 0
  Ref1 = FuncNoArgNoRet
  Ref1()
  assert_equal(11, funcResult)
enddef

def Test_func_type_fails()
  CheckDefFailure(['let ref1: func()'], 'E704:')

  CheckDefFailure(['let Ref1: func()', 'Ref1 = FuncNoArgRetNumber'], 'E1013: type mismatch, expected func() but got func(): number')
  CheckDefFailure(['let Ref1: func()', 'Ref1 = FuncOneArgNoRet'], 'E1013: type mismatch, expected func() but got func(number)')
  CheckDefFailure(['let Ref1: func()', 'Ref1 = FuncOneArgRetNumber'], 'E1013: type mismatch, expected func() but got func(number): number')
enddef


" vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker