patch 9.0.1786: Vim9: need instanceof() function
Problem: Vim9: need instanceof() function
Solution: Implement instanceof() builtin
Implemented in the same form as Python's isinstance because it allows
for checking multiple class types at the same time.
closes: #12867
Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: LemonBoy <thatlemon@gmail.com>
diff --git a/src/testdir/test_vim9_builtin.vim b/src/testdir/test_vim9_builtin.vim
index d64366d..da8bc42 100644
--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -2301,6 +2301,24 @@
v9.CheckDefAndScriptFailure(['insert([2, 3], 1, "x")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
enddef
+def Test_instanceof()
+ var lines =<< trim END
+ vim9script
+ class Foo
+ endclass
+ instanceof('hello', Foo)
+ END
+ v9.CheckScriptFailure(lines, 'E616: Object required for argument 1')
+
+ lines =<< trim END
+ vim9script
+ class Foo
+ endclass
+ instanceof(Foo.new(), 123)
+ END
+ v9.CheckScriptFailure(lines, 'E693: List or Class required for argument 2')
+enddef
+
def Test_invert()
v9.CheckDefAndScriptFailure(['invert("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
enddef
diff --git a/src/testdir/test_vim9_class.vim b/src/testdir/test_vim9_class.vim
index 7e33c6d..a650cc2 100644
--- a/src/testdir/test_vim9_class.vim
+++ b/src/testdir/test_vim9_class.vim
@@ -2367,6 +2367,39 @@
v9.CheckScriptSuccess(lines)
enddef
+def Test_instanceof()
+ var lines =<< trim END
+ vim9script
+
+ class Base1
+ endclass
+
+ class Base2 extends Base1
+ endclass
+
+ interface Intf1
+ endinterface
+
+ class Mix1 implements Intf1
+ endclass
+
+ class Base3 extends Mix1
+ endclass
+
+ var b1 = Base1.new()
+ var b2 = Base2.new()
+ var b3 = Base3.new()
+
+ assert_true(instanceof(b1, Base1))
+ assert_true(instanceof(b2, Base1))
+ assert_false(instanceof(b1, Base2))
+ assert_true(instanceof(b3, Mix1))
+ assert_false(instanceof(b3, []))
+ assert_true(instanceof(b3, [Base1, Base2, Intf1]))
+ END
+ v9.CheckScriptSuccess(lines)
+enddef
+
" Test for calling a method in the parent class that is extended partially.
" This used to fail with the 'E118: Too many arguments for function: Text' error
" message (Github issue #12524).