runtime(vim): Distinguish Vim9 builtin object methods from namesake builtin functions (#14348)

Currently, the overriding object method definitions are
matched as vimFunctionError (:help builtin-object-methods,
v9.1.0148).

For example:
------------------------------------------------------------
vim9script

class Test
	def string(): string
		return "Test"
	enddef
endclass

echo string(Test.new()) == Test.new().string()
------------------------------------------------------------

Instead, let's introduce a new syntax group vimMethodName
and make these methods its members.  In order to emphasise
the link between the overriding methods and the overridden
functions for highlighting, vimMethodName is linked by
default to vimFuncName.

Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

7 files changed, 152 insertions, 8 deletions

diff --git a/runtime/syntax/generator/vim.vim.base b/runtime/syntax/generator/vim.vim.base
index 25c67ecacb..0f8ab0adda 100644
--- a/runtime/syntax/generator/vim.vim.base
+++ b/runtime/syntax/generator/vim.vim.base
@@ -3,7 +3,7 @@
 " Maintainer:	   Hirohito Higashi <h.east.727 ATMARK gmail.com>
 "	   Doug Kearns <dougkearns@gmail.com>
 " URL:	   https://github.com/vim-jp/syntax-vim-ex
-" Last Change:	   2024 Mar 28
+" Last Change:	   2024 Mar 31
 " Former Maintainer: Charles E. Campbell
 
 " DO NOT CHANGE DIRECTLY.
@@ -249,7 +249,7 @@ syn match	vimDef	"\<def\>"		skipwhite nextgroup=vimCmdSep,vimComment,vimFuncPatt
 
 syn match	vimFunction	"\<fu\%[nction]\>!\=\s*\%(<[sS][iI][dD]>\|[sg]:\)\=\%(\i\|[#.]\|{.\{-1,}}\)\+"	contains=@vimFuncList skipwhite nextgroup=vimFuncParams
 syn match	vimDef	"\<def\s\+new\%(\i\|{.\{-1,}}\)\+"				contains=@vimDefList            nextgroup=vimDefParams
-syn match	vimDef	"\<def\>!\=\s*\%(<[sS][iI][dD]>\|[sg]:\)\=\%(\i\|[#.]\|{.\{-1,}}\)\+"		contains=@vimDefList            nextgroup=vimDefParams
+syn match	vimDef	"\<def\>!\=\s*\%(<[sS][iI][dD]>\|[sg]:\)\=\%(\i\|[#.]\|{.\{-1,}}\)\+"		contains=@vimDefList,vimMethodName            nextgroup=vimDefParams
 
 syn match	vimFuncComment	contained	+".*+ skipwhite skipnl nextgroup=vimFuncBody,vimEndfunction
 syn match	vimDefComment	contained	"#.*" skipwhite skipnl nextgroup=vimDefBody,vimEnddef
@@ -259,6 +259,7 @@ syn match	vimFuncSID	contained	"\c<sid>"
 syn match	vimFuncSID	contained	"\<[sg]:"
 syn keyword	vimFuncKey	contained	fu[nction]
 syn keyword	vimDefKey	contained	def
+syn keyword	vimMethodName	contained	empty len string
 
 syn region	vimFuncParams	contained	matchgroup=Delimiter start="(" skip=+\n\s*\\\|\n\s*"\\ + end=")" skipwhite skipnl nextgroup=vimFuncBody,vimFuncComment,vimEndfunction,vimFuncMod contains=vimFuncParam,@vimContinue
 syn region	vimDefParams	contained	matchgroup=Delimiter start="("		   end=")" skipwhite skipnl nextgroup=vimDefBody,vimDefComment,vimEnddef,vimReturnType	 contains=vimDefParam,vim9Comment
@@ -579,7 +580,7 @@ syn case match
 " (following Gautam Iyer's suggestion)
 " ==========================
 syn match	vimFunc              	"\%(\%([sSgGbBwWtTlL]:\|<[sS][iI][dD]>\)\=\%(\w\+\.\)*\I[a-zA-Z0-9_.]*\)\ze\s*("                	contains=vimFuncEcho,vimFuncName,vimUserFunc,vimExecute
-syn match	vimUserFunc	contained        	"\%(\%([sSgGbBwWtTlL]:\|<[sS][iI][dD]>\)\=\%(\w\+\.\)*\I[a-zA-Z0-9_.]*\)\|\<\u[a-zA-Z0-9.]*\>\|\<if\>"	contains=vimNotation
+syn match	vimUserFunc	contained        	"\%(\%([sSgGbBwWtTlL]:\|<[sS][iI][dD]>\)\=\%(\w\+\.\)*\I[a-zA-Z0-9_.]*\)\|\<\u[a-zA-Z0-9.]*\>\|\<if\>"	contains=vimNotation,vimMethodName
 syn keyword	vimFuncEcho	contained      	ec ech echo
 
 " User Command Highlighting: {{{2
@@ -589,7 +590,9 @@ syn match vimUsrCmd	'^\s*\zs\u\%(\w*\)\@>\%([(#[]\|\s\+\%([-+*/%]\=\|\.\.\)=\)\@
 " ====================
 if !exists("g:vimsyn_noerror") && !exists("g:vimsyn_novimfunctionerror")
  " TODO: The new-prefix exception should only apply to constructor definitions.
- syn match	vimFunctionError	"\s\zs\%(new\)\@![a-z0-9]\i\{-}\ze\s*("		contained contains=vimFuncKey,vimFuncBlank
+ " TODO: The |builtin-object-methods| exception should only apply to method
+ " definitions.
+ syn match	vimFunctionError	"\s\zs\%(empty\|len\|new\|string\)\@![a-z0-9]\i\{-}\ze\s*("		contained contains=vimFuncKey,vimFuncBlank
  syn match	vimFunctionError	"\s\zs\%(<[sS][iI][dD]>\|[sSgGbBwWtTlL]:\)\d\i\{-}\ze\s*("	contained contains=vimFuncKey,vimFuncBlank
  syn match	vimElseIfErr	"\<else\s\+if\>"
  syn match	vimBufnrWarn	/\<bufnr\s*(\s*["']\.['"]\s*)/
@@ -1091,6 +1094,7 @@ if !exists("skip_vim_syntax_inits")
  hi def link vimMenuPriority	Number
  hi def link vimMenuStatus	Special
  hi def link vimMenutranslateComment	vimComment
+ hi def link vimMethodName	vimFuncName
  hi def link vimMtchComment	vimComment
  hi def link vimNorm	vimCommand
  hi def link vimNotation	Special
diff --git a/runtime/syntax/testdir/dumps/vim_object_methods_00.dump b/runtime/syntax/testdir/dumps/vim_object_methods_00.dump
new file mode 100644
index 0000000000..8089fc1880
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_object_methods_00.dump
@@ -0,0 +1,20 @@
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+@75
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+|c+0#af5f00255&|l|a|s@1| +0#0000000&|P|a|i|r|C|l|a|s@1|T|e|s|t| @55
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+@57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/vim_object_methods_01.dump b/runtime/syntax/testdir/dumps/vim_object_methods_01.dump
new file mode 100644
index 0000000000..05bb98f30f
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_object_methods_01.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim_object_methods_02.dump b/runtime/syntax/testdir/dumps/vim_object_methods_02.dump
new file mode 100644
index 0000000000..7fd4942c99
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_object_methods_02.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim_object_methods_99.dump b/runtime/syntax/testdir/dumps/vim_object_methods_99.dump
new file mode 100644
index 0000000000..b69bf91284
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_object_methods_99.dump
@@ -0,0 +1,20 @@
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+|c+0#af5f00255&|o|n|s|t| +0#0000000&|b+0#00e0e07&|2|:+0#0000000&| |b|o@1|l| |=+0#af5f00255&| +0#0000000&|!+0#af5f00255&|p+0#0000000&|a|i|r|.|e+0#0000001#ffff4012|m|p|t|y|(+0#e000e06#ffffff0|)| +0#0000000&@44
+|c+0#af5f00255&|o|n|s|t| +0#0000000&|n+0#00e0e07&|2|:+0#0000000&| |n+0#af5f00255&|u|m|b|e|r| +0#0000000&|=+0#af5f00255&| +0#0000000&|p|a|i|r|.|l+0#0000001#ffff4012|e|n|(+0#e000e06#ffffff0|)| +0#0000000&@45
+|c+0#af5f00255&|o|n|s|t| +0#0000000&|s+0#00e0e07&|2|:+0#0000000&| |s|t|r|i|n|g| |=+0#af5f00255&| +0#0000000&|p|a|i|r|.|s+0#0000001#ffff4012|t|r|i|n|g|(+0#e000e06#ffffff0|)| +0#0000000&@42
+|e+0#af5f00255&|c|h|o| +0#0000000&|b+0#00e0e07&|2| +0#0000000&|&+0#af5f00255&@1| +0#0000000&|!+0#af5f00255&|e+0#00e0e07&|m|p|t|y|(+0#e000e06&|p+0#00e0e07&|a|i|r|)+0#e000e06&| +0#0000000&@51
+|e+0#af5f00255&|c|h|o| +0#0000000&|n+0#00e0e07&|2| +0#0000000&|=+0#af5f00255&@1| +0#0000000&|2+0#e000002&| +0#0000000&|&+0#af5f00255&@1| +0#0000000&|l+0#00e0e07&|e|n|(+0#e000e06&|p+0#00e0e07&|a|i|r|)+0#e000e06&| +0#0000000&|=+0#af5f00255&@1| +0#0000000&|2+0#e000002&| +0#0000000&@44
+>e+0#af5f00255&|c|h|o| +0#0000000&|s+0#00e0e07&|2| +0#0000000&|=+0#af5f00255&@1| +0#0000000&|'+0#e000002&|(|0|,| |1|)|'| +0#0000000&|&+0#af5f00255&@1| +0#0000000&|s+0#00e0e07&|t|r|i|n|g|(+0#e000e06&|p+0#00e0e07&|a|i|r|)+0#e000e06&| +0#0000000&|=+0#af5f00255&@1| +0#0000000&|'+0#e000002&|(|0|,| |1|)|'| +0#0000000&@27
+@57|5|6|,|1| @9|B|o|t| 
diff --git a/runtime/syntax/testdir/input/vim_object_methods.vim b/runtime/syntax/testdir/input/vim_object_methods.vim
new file mode 100644
index 0000000000..d22c7f2e6f
--- /dev/null
+++ b/runtime/syntax/testdir/input/vim_object_methods.vim
@@ -0,0 +1,56 @@
+vim9script
+# VIM_TEST_SETUP hi link vimMethodName Todo
+
+
+# Vim |builtin-object-methods| and namesake builtin functions.
+class PairClassTest
+	public const a: any
+	public const b: any
+
+	def new(a: any, b: any)
+		this.a = a
+		this.b = b
+	enddef
+
+	def empty(): bool
+		return false
+	enddef
+	def len(): number
+		return 2
+	enddef
+	def string(): string
+		return printf('(%s, %s)', this.a, this.b)
+	enddef
+endclass
+
+enum MarkerEnumTest
+	INSTANCE
+
+	def NoOp()
+	enddef
+
+	def empty(): bool
+		return true
+	enddef
+	def len(): number
+		return 0
+	enddef
+	def string(): string
+		return this.name
+	enddef
+endenum
+
+const b1: bool = empty(MarkerEnumTest.INSTANCE)
+const n1: number = len(MarkerEnumTest.INSTANCE)
+const s1: string = string(MarkerEnumTest.INSTANCE)
+echo b1 && MarkerEnumTest.INSTANCE.empty()
+echo n1 == 0 && MarkerEnumTest.INSTANCE.len() == 0
+echo s1 == 'INSTANCE' && MarkerEnumTest.INSTANCE.string() == 'INSTANCE'
+
+const pair: PairClassTest = PairClassTest.new(0, 1)
+const b2: bool = !pair.empty()
+const n2: number = pair.len()
+const s2: string = pair.string()
+echo b2 && !empty(pair)
+echo n2 == 2 && len(pair) == 2
+echo s2 == '(0, 1)' && string(pair) == '(0, 1)'
diff --git a/runtime/syntax/vim.vim b/runtime/syntax/vim.vim
index c68f0fea4a..5b956703b4 100644
--- a/runtime/syntax/vim.vim
+++ b/runtime/syntax/vim.vim
@@ -3,7 +3,7 @@
 " Maintainer:	   Hirohito Higashi <h.east.727 ATMARK gmail.com>
 "	   Doug Kearns <dougkearns@gmail.com>
 " URL:	   https://github.com/vim-jp/syntax-vim-ex
-" Last Change:	   2024 Mar 28
+" Last Change:	   2024 Mar 31
 " Former Maintainer: Charles E. Campbell
 
 " DO NOT CHANGE DIRECTLY.
@@ -286,7 +286,7 @@ syn match	vimDef	"\<def\>"		skipwhite nextgroup=vimCmdSep,vimComment,vimFuncPatt
 
 syn match	vimFunction	"\<fu\%[nction]\>!\=\s*\%(<[sS][iI][dD]>\|[sg]:\)\=\%(\i\|[#.]\|{.\{-1,}}\)\+"	contains=@vimFuncList skipwhite nextgroup=vimFuncParams
 syn match	vimDef	"\<def\s\+new\%(\i\|{.\{-1,}}\)\+"				contains=@vimDefList            nextgroup=vimDefParams
-syn match	vimDef	"\<def\>!\=\s*\%(<[sS][iI][dD]>\|[sg]:\)\=\%(\i\|[#.]\|{.\{-1,}}\)\+"		contains=@vimDefList            nextgroup=vimDefParams
+syn match	vimDef	"\<def\>!\=\s*\%(<[sS][iI][dD]>\|[sg]:\)\=\%(\i\|[#.]\|{.\{-1,}}\)\+"		contains=@vimDefList,vimMethodName            nextgroup=vimDefParams
 
 syn match	vimFuncComment	contained	+".*+ skipwhite skipnl nextgroup=vimFuncBody,vimEndfunction
 syn match	vimDefComment	contained	"#.*" skipwhite skipnl nextgroup=vimDefBody,vimEnddef
@@ -296,6 +296,7 @@ syn match	vimFuncSID	contained	"\c<sid>"
 syn match	vimFuncSID	contained	"\<[sg]:"
 syn keyword	vimFuncKey	contained	fu[nction]
 syn keyword	vimDefKey	contained	def
+syn keyword	vimMethodName	contained	empty len string
 
 syn region	vimFuncParams	contained	matchgroup=Delimiter start="(" skip=+\n\s*\\\|\n\s*"\\ + end=")" skipwhite skipnl nextgroup=vimFuncBody,vimFuncComment,vimEndfunction,vimFuncMod contains=vimFuncParam,@vimContinue
 syn region	vimDefParams	contained	matchgroup=Delimiter start="("		   end=")" skipwhite skipnl nextgroup=vimDefBody,vimDefComment,vimEnddef,vimReturnType	 contains=vimDefParam,vim9Comment
@@ -623,7 +624,7 @@ syn case match
 " (following Gautam Iyer's suggestion)
 " ==========================
 syn match	vimFunc              	"\%(\%([sSgGbBwWtTlL]:\|<[sS][iI][dD]>\)\=\%(\w\+\.\)*\I[a-zA-Z0-9_.]*\)\ze\s*("                	contains=vimFuncEcho,vimFuncName,vimUserFunc,vimExecute
-syn match	vimUserFunc	contained        	"\%(\%([sSgGbBwWtTlL]:\|<[sS][iI][dD]>\)\=\%(\w\+\.\)*\I[a-zA-Z0-9_.]*\)\|\<\u[a-zA-Z0-9.]*\>\|\<if\>"	contains=vimNotation
+syn match	vimUserFunc	contained        	"\%(\%([sSgGbBwWtTlL]:\|<[sS][iI][dD]>\)\=\%(\w\+\.\)*\I[a-zA-Z0-9_.]*\)\|\<\u[a-zA-Z0-9.]*\>\|\<if\>"	contains=vimNotation,vimMethodName
 syn keyword	vimFuncEcho	contained      	ec ech echo
 
 " User Command Highlighting: {{{2
@@ -633,7 +634,9 @@ syn match vimUsrCmd	'^\s*\zs\u\%(\w*\)\@>\%([(#[]\|\s\+\%([-+*/%]\=\|\.\.\)=\)\@
 " ====================
 if !exists("g:vimsyn_noerror") && !exists("g:vimsyn_novimfunctionerror")
  " TODO: The new-prefix exception should only apply to constructor definitions.
- syn match	vimFunctionError	"\s\zs\%(new\)\@![a-z0-9]\i\{-}\ze\s*("		contained contains=vimFuncKey,vimFuncBlank
+ " TODO: The |builtin-object-methods| exception should only apply to method
+ " definitions.
+ syn match	vimFunctionError	"\s\zs\%(empty\|len\|new\|string\)\@![a-z0-9]\i\{-}\ze\s*("		contained contains=vimFuncKey,vimFuncBlank
  syn match	vimFunctionError	"\s\zs\%(<[sS][iI][dD]>\|[sSgGbBwWtTlL]:\)\d\i\{-}\ze\s*("	contained contains=vimFuncKey,vimFuncBlank
  syn match	vimElseIfErr	"\<else\s\+if\>"
  syn match	vimBufnrWarn	/\<bufnr\s*(\s*["']\.['"]\s*)/
@@ -1135,6 +1138,7 @@ if !exists("skip_vim_syntax_inits")
  hi def link vimMenuPriority	Number
  hi def link vimMenuStatus	Special
  hi def link vimMenutranslateComment	vimComment
+ hi def link vimMethodName	vimFuncName
  hi def link vimMtchComment	vimComment
  hi def link vimNorm	vimCommand
  hi def link vimNotation	Special