runtime(vim): Update base-syntax file, improve class, enum and interface highlighting

- Enable folding of class, enum and interface declarations.
- Highlight constructor names with the Function highlight group, like
  other special methods.
- Mark function definitions using special method names as errors.
- Highlight :type arguments.

fixes: #14393#issuecomment-2042796198.
closes: #13810

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/testdir/input/vim9_ex_class_fold.vim

@@ -0,0 +1,70 @@
+vim9script
+# Vim9 :class command
+# VIM_TEST_SETUP let g:vimsyn_folding = 'cf'
+# VIM_TEST_SETUP setl fdc=2 fdl=99 fdm=syntax
+
+interface Interface1
+endinterface
+interface Interface2
+endinterface
+
+class Class1
+endclass
+
+export class Class2
+endclass
+
+abstract class Class3
+endclass
+
+export abstract class Class4
+endclass
+
+class Class5 extends Class1
+endclass
+
+export class Class6 extends Class1
+endclass
+
+class Class7 implements Interface1, Interface2
+endclass
+
+export class Class8 implements Interface1, Interface2
+endclass
+
+class Class9
+  def new()
+  enddef
+  def Method1(): void
+    def Nested1(): void
+      def Nested2(): void
+      enddef
+    enddef
+  enddef
+  def _Method2(): void
+  enddef
+  static def Method3(): void
+  enddef
+endclass
+
+abstract class Class10
+  abstract def Method1(): void
+  abstract def string(): string
+endclass
+
+
+# Issue: #14393
+
+interface Testable
+    def SetUp()
+    def TearDown()
+endinterface
+
+abstract class TestTemplate implements Testable
+    var failed: number
+    var passed: number
+
+    abstract def SetUp()
+    abstract def TearDown()
+endclass
+

runtime/syntax/testdir/input/vim9_ex_commands.vim

@@ -93,7 +93,6 @@ vim9script
 :checktime
 :chistory
 :class
-:class
 :clast
 :clearjumps
 :clist
@@ -172,7 +171,6 @@ vim9script
 :elseif
 :emenu
 :endclass
-:endclass
 :enddef
 :endenum
 :endfor
@@ -385,8 +383,6 @@ vim9script
 :ptprevious
 :ptrewind
 :ptselect
-:public
-:public
 :put
 :pwd
 :py3
@@ -479,8 +475,6 @@ vim9script
 :startgreplace
 :startinsert
 :startreplace
-:static
-:static
 :stjump
 :stop
 :stopinsert
@@ -681,7 +675,6 @@ Foo() | checkpath
 Foo() | checktime
 Foo() | chistory
 Foo() | class
-Foo() | class
 Foo() | clast
 Foo() | clearjumps
 Foo() | clist
@@ -760,7 +753,6 @@ Foo() | else
 Foo() | elseif
 Foo() | emenu
 Foo() | endclass
-Foo() | endclass
 Foo() | enddef
 Foo() | endenum
 Foo() | endfor
@@ -972,8 +964,6 @@ Foo() | ptNext
 Foo() | ptprevious
 Foo() | ptrewind
 Foo() | ptselect
-Foo() | public
-Foo() | public
 Foo() | put
 Foo() | pwd
 Foo() | py3
@@ -1066,8 +1056,6 @@ Foo() | stag
 Foo() | startgreplace
 Foo() | startinsert
 Foo() | startreplace
-Foo() | static
-Foo() | static
 Foo() | stjump
 Foo() | stop
 Foo() | stopinsert

runtime/syntax/testdir/input/vim9_ex_enum_fold.vim

@@ -0,0 +1,39 @@
+vim9script
+# Vim :enum command
+# VIM_TEST_SETUP let g:vimsyn_folding = 'ef'
+# VIM_TEST_SETUP setl fdc=2 fdl=99 fdm=syntax
+
+interface Interface1
+endinterface
+interface Interface2
+endinterface
+
+enum Enum1
+endenum
+
+export enum Enum2
+endenum
+
+enum Enum3
+  Value1,
+  Value2,
+  Value3
+endenum
+
+enum Enum4
+  Value1,
+  Value2,
+  Value3
+  def Method1()
+  enddef
+endenum
+
+enum Enum5 implements Interface1, Interface2
+    Value1,
+    Value2,
+    Value3
+    def Method1()
+      def Nested()
+      enddef
+    enddef
+endenum

runtime/syntax/testdir/input/vim9_ex_interface_fold.vim

@@ -0,0 +1,36 @@
+vim9script
+# Vim :interface command
+# VIM_TEST_SETUP let g:vimsyn_folding = 'i'
+# VIM_TEST_SETUP setl fdc=2 fdl=99 fdm=syntax
+
+interface Interface1
+endinterface
+
+export interface Interface2
+endinterface
+
+interface Interface2
+  # comment
+  var var1: number
+endinterface
+
+interface Interface3
+  # comment
+  def Meth1(): number
+endinterface
+
+interface Interface4
+  # comment
+  var var1: number
+  # comment
+  def Meth1(): number
+endinterface
+
+interface Interface5
+  # comment
+  var var1: number
+  var var2: number
+  # comment
+  def Meth1(): number
+  def Meth2(): number
+endinterface

runtime/syntax/testdir/input/vim9_ex_special_method_definitions.vim

@@ -0,0 +1,113 @@
+vim9script
+# Vim9 special methods new*(), empty(), len(), string()
+
+def new()
+enddef
+
+def newOther()
+enddef
+
+def newyetanother()
+enddef
+
+def empty(): bool
+  return true
+enddef
+
+def len(): number
+  return 0
+enddef
+
+def string(): string
+  return ""
+enddef
+
+class A
+  def new()
+    def newNested()
+    enddef
+    def empty(): bool
+      return true
+    enddef
+    def len(): number
+      return 0
+    enddef
+    def string(): string
+      return ""
+    enddef
+  enddef
+
+  def newOther()
+    def newNested()
+    enddef
+    def empty(): bool
+      return true
+    enddef
+    def len(): number
+      return 0
+    enddef
+    def string(): string
+      return ""
+    enddef
+  enddef
+
+  def newyetanother()
+    def newNested()
+    enddef
+    def empty(): bool
+      return true
+    enddef
+    def len(): number
+      return 0
+    enddef
+    def string(): string
+      return ""
+    enddef
+  enddef
+
+  def empty(): bool
+    def newNested()
+    enddef
+    def empty(): bool
+      return true
+    enddef
+    def len(): number
+      return 0
+    enddef
+    def string(): string
+      return ""
+    enddef
+    return true
+  enddef
+
+  def len(): number
+    def newNested()
+    enddef
+    def empty(): bool
+	return true
+    enddef
+    def len(): number
+	return 0
+    enddef
+    def string(): string
+	return ""
+    enddef
+    return 0
+  enddef
+
+  def string(): string
+    def newNested()
+    enddef
+    def empty(): bool
+	return true
+    enddef
+    def len(): number
+	return 0
+    enddef
+    def string(): string
+	return ""
+    enddef
+    return ""
+  enddef
+endclass
+

runtime/syntax/testdir/input/vim9_ex_type.vim

@@ -0,0 +1,11 @@
+vim9script
+# Vim :type command
+
+type Foo = string
+type Bar = list<string>
+type Baz = Foo
+
+export type Qux = Baz
+
+type foo = string
+

runtime/syntax/testdir/input/vim_ex_commands.vim

@@ -383,7 +383,6 @@
 :ptprevious
 :ptrewind
 :ptselect
-:public
 :put
 :pwd
 :py3
@@ -478,7 +477,6 @@
 :startinsert
 :startgreplace
 :startreplace
-:static
 :stopinsert
 :stjump
 :stselect
@@ -971,7 +969,6 @@ call Foo() | ptnext
 call Foo() | ptprevious
 call Foo() | ptrewind
 call Foo() | ptselect
-call Foo() | public
 call Foo() | put
 call Foo() | pwd
 call Foo() | py3
@@ -1066,7 +1063,6 @@ call Foo() | stag
 call Foo() | startinsert
 call Foo() | startgreplace
 call Foo() | startreplace
-call Foo() | static
 call Foo() | stopinsert
 call Foo() | stjump
 call Foo() | stselect
@@ -1187,8 +1183,6 @@ call Foo() | z
 
 :abstract
 :class
-:defcompile
-:disassemble
 :endclass
 :endinterface
 :endenum
@@ -1203,8 +1197,6 @@ call Foo() | z
 
 Foo() | abstract
 Foo() | class
-Foo() | defcompile
-Foo() | disassemble
 Foo() | endclass
 Foo() | endenum
 Foo() | endinterface

runtime/syntax/testdir/input/vim_ex_menu.vim

@@ -76,7 +76,7 @@ popup! &Foo | echo "Foo"
 
 " a menu item name cannot start with '.'
 
-export def HistoryJumpMenu()
+def HistoryJumpMenu()
     popup.FilterMenu("Jump history", dir_hist,
         (res, _) => {
             HistoryJump(res.text)