runtime(vim): Improve Vim9 and legacy-script comment highlighting (#13104)

This is a first-pass attempt to limit matching of Vim9 and legacy-script
comments to the appropriate syntactic contexts.

Vim9-script comments are highlighted at top level in a Vim9-script file,
in all :def functions, and in all :autocmd and :commmand command blocks.
Legacy-script comments are highlighted at top level in a legacy script
file, in all :func functions and in the Vim9-script preamble before the
:vim9script marker command.

Fixes #13047, #11307 and #9587.

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

25 files changed, 441 insertions, 12 deletions

diff --git a/runtime/syntax/testdir/dumps/vim9_keymap_00.dump b/runtime/syntax/testdir/dumps/vim9_keymap_00.dump
new file mode 100644
index 0000000000..d1bc96cfd8
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim9_keymap_00.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim9_keymap_01.dump b/runtime/syntax/testdir/dumps/vim9_keymap_01.dump
new file mode 100644
index 0000000000..1d0823fe61
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim9_keymap_01.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim9_keymap_99.dump b/runtime/syntax/testdir/dumps/vim9_keymap_99.dump
new file mode 100644
index 0000000000..8afcbba81b
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim9_keymap_99.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim9_legacy_header_00.dump b/runtime/syntax/testdir/dumps/vim9_legacy_header_00.dump
new file mode 100644
index 0000000000..2f682d960b
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim9_legacy_header_00.dump
@@ -0,0 +1,20 @@
+>"+0#0000e05#ffffff0| |c|o|m@1|e|n|t| +0#0000000&@65
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diff --git a/runtime/syntax/testdir/dumps/vim9_legacy_header_99.dump b/runtime/syntax/testdir/dumps/vim9_legacy_header_99.dump
new file mode 100644
index 0000000000..d400e3166d
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim9_legacy_header_99.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim_00.dump b/runtime/syntax/testdir/dumps/vim_00.dump
new file mode 100644
index 0000000000..852148f1f4
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_00.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim_99.dump b/runtime/syntax/testdir/dumps/vim_99.dump
new file mode 100644
index 0000000000..8e9320cc92
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_99.dump
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diff --git a/runtime/syntax/testdir/dumps/vim_ex_commands_31.dump b/runtime/syntax/testdir/dumps/vim_ex_commands_31.dump
index 07075f7d45..3711988d69 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_commands_31.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_commands_31.dump
@@ -5,7 +5,7 @@
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diff --git a/runtime/syntax/testdir/dumps/vim_ex_commands_64.dump b/runtime/syntax/testdir/dumps/vim_ex_commands_64.dump
index 5561d991de..bf3df8d628 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_commands_64.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_commands_64.dump
@@ -5,7 +5,7 @@
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diff --git a/runtime/syntax/testdir/dumps/vim_ex_comment-vim9_00.dump b/runtime/syntax/testdir/dumps/vim_ex_comment-vim9_00.dump
new file mode 100644
index 0000000000..57b021621b
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_ex_comment-vim9_00.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim_ex_comment-vim9_01.dump b/runtime/syntax/testdir/dumps/vim_ex_comment-vim9_01.dump
new file mode 100644
index 0000000000..1b0d7c9357
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_ex_comment-vim9_01.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim_ex_comment-vim9_02.dump b/runtime/syntax/testdir/dumps/vim_ex_comment-vim9_02.dump
new file mode 100644
index 0000000000..7de6ffb978
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_ex_comment-vim9_02.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim_ex_comment-vim9_99.dump b/runtime/syntax/testdir/dumps/vim_ex_comment-vim9_99.dump
new file mode 100644
index 0000000000..f8759da214
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_ex_comment-vim9_99.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim_ex_comment_00.dump b/runtime/syntax/testdir/dumps/vim_ex_comment_00.dump
new file mode 100644
index 0000000000..a1c188092f
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_ex_comment_00.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim_ex_comment_01.dump b/runtime/syntax/testdir/dumps/vim_ex_comment_01.dump
new file mode 100644
index 0000000000..513f64ca91
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_ex_comment_01.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim_ex_comment_02.dump b/runtime/syntax/testdir/dumps/vim_ex_comment_02.dump
new file mode 100644
index 0000000000..e2b6092a84
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_ex_comment_02.dump
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diff --git a/runtime/syntax/testdir/dumps/vim_ex_comment_99.dump b/runtime/syntax/testdir/dumps/vim_ex_comment_99.dump
new file mode 100644
index 0000000000..e9bcabeb92
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_ex_comment_99.dump
@@ -0,0 +1,20 @@
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+@75
+@75
+|"+0#0000e05&| +0#0000000&|I+0#e000e06&|s@1|u|e|:| +0#0000e05&|#|1@1|3|0|7| |a|n|d| |#|1@1|5|6|0| +0#0000000&@48
+@75
+|"+0#0000e05&| |T|h|i|s| |i|s| |w|h|a|t| |w|e| |c|a|l@1| |"| |b|l|a|h| +0#0000000&@45
+@75
+@75
+|"+0#0000e05&| |I|s@1|u|e| |#| |#|9|5|8|7| +0#0000000&@59
+@75
+|d+0#af5f00255&|e|f| +0#0000000&|C|o|m@1|e|n|t|T|i|t|l|e|(+0#e000e06&|)| +0#0000000&@56
+| +0#0000e05&@1|#| +0#0000000&|T+0#e000e06&|i|t|l|e|:| +0#0000e05&|.@2| +0#0000000&@60
+>e+0#af5f00255&|n|d@1|e|f| +0#0000000&@68
+@57|4|5|,|1| @9|B|o|t| 
diff --git a/runtime/syntax/testdir/dumps/vim_keymap_01.dump b/runtime/syntax/testdir/dumps/vim_keymap_01.dump
index 9a7a8333a6..a07bfc4053 100644
--- a/runtime/syntax/testdir/dumps/vim_keymap_01.dump
+++ b/runtime/syntax/testdir/dumps/vim_keymap_01.dump
@@ -17,4 +17,4 @@
 |"+0#0000e05&| |V|i|m|-|s|c|r|i|p|t| |c|o|m@1|e|n|t| |c|h|a|r|a|c|t|e|r|s| @30| +0#0000000&@12
 |#| |<+0#e000e06&|c|h|a|r|-|0|x|0@1|a|3|>| +0#0000000&@15|L+0#0000e05&|i|n|e| |s|h|o|u|l|d| |n|o|t| |m|a|t|c|h| |a|s| |a| |V|i|m|9|-|s|c|r|i|p|t| |c|o|m@1|e
 |n|t| +0#0000000&@72
-@57|1|9|,|1| @9|9|3|%| 
+@57|1|9|,|1| @9|8|7|%| 
diff --git a/runtime/syntax/testdir/dumps/vim_keymap_99.dump b/runtime/syntax/testdir/dumps/vim_keymap_99.dump
index ad6b5a58b1..1b27d57817 100644
--- a/runtime/syntax/testdir/dumps/vim_keymap_99.dump
+++ b/runtime/syntax/testdir/dumps/vim_keymap_99.dump
@@ -1,6 +1,4 @@
-|a+0&#ffffff0| |A| @3|B+0#0000e05&|a|s|i|c| |m|a|p@1|i|n|g| @38| +0#0000000&@15
-|'|a| |á| @2|M+0#0000e05&|o|r|e| |t|h|a|n| |o|n|e| |c|h|a|r| |i|n| |f|i|r|s|t| |c|o|l|u|m|n| @10| +0#0000000&@22
-@75
+| +0&#ffffff0@74
 |"+0#0000e05&| |S|p|e|c|i|a|l| |n|o|t|a|t|i|o|n| @56
 @60| +0#0000000&@14
 |<+0#e000e06&|c|h|a|r|-|6|2|>| +0#0000000&@5|B| @14|S+0#0000e05&|p|e|c|i|a|l| |n|o|t|a|t|i|o|n| |a|l@1|o|w|e|d| |i|n| |L|H|S| |-| |d|e|c|i|m|a|l| @2
@@ -15,6 +13,8 @@
 |"+0#0000e05&| |V|i|m|-|s|c|r|i|p|t| |c|o|m@1|e|n|t| |c|h|a|r|a|c|t|e|r|s| @30| +0#0000000&@12
 |#| |<+0#e000e06&|c|h|a|r|-|0|x|0@1|a|3|>| +0#0000000&@15|L+0#0000e05&|i|n|e| |s|h|o|u|l|d| |n|o|t| |m|a|t|c|h| |a|s| |a| |V|i|m|9|-|s|c|r|i|p|t| |c|o|m@1|e
 |n|t| +0#0000000&@72
->\|"| |“| @18|L+0#0000e05&|i|n|e| |s|h|o|u|l|d| |n|o|t| |m|a|t|c|h| |a|s| |a| |l|e|g|a|c|y|-|s|c|r|i|p|t| |c|o|m@1|e|n|t| | +0#0000000&@2
-|~+0#4040ff13&| @73
-| +0#0000000&@56|2|6|,|1| @9|B|o|t| 
+|\|"| |“| @26|L+0#0000e05&|i|n|e| |s|h|o|u|l|d| |n|o|t| |m|a|t|c|h| |a|s| |a| |l|e|g|a|c|y|-|s|c|r|i|p|t| |c|o|m
+@1|e|n|t| | +0#0000000&@69
+>:| |"| @27|L+0#0000e05&|i|n|e| |s|h|o|u|l|d| |n|o|t| |m|a|t|c|h| |a|s| |a| |l|e|g|a|c|y|-|s|c|r|i|p|t| |c|o|m
+@1|e|n|t| +0#0000000&@70
+@57|2|7|,|1| @9|B|o|t| 
diff --git a/runtime/syntax/testdir/input/vim9_keymap.vim b/runtime/syntax/testdir/input/vim9_keymap.vim
new file mode 100644
index 0000000000..a69b723a73
--- /dev/null
+++ b/runtime/syntax/testdir/input/vim9_keymap.vim
@@ -0,0 +1,26 @@
+vim9script
+
+# Vim Keymap file for syntax testing
+
+scriptencoding utf-8
+
+let b:keymap_name = "syntax-test"
+
+loadkeymap
+
+# Line comment
+
+  # Another line comment
+
+a A    Basic mapping
+'a á   More than one char in first column
+
+# Special notation
+<char-62>      B               Special notation allowed in LHS - decimal
+c              <char-0103>     Special notation allowed in RHS - octal
+<char-0x0064>  <char-0x0044>   Special notation allowed in LHS and RHS - hexadecimal
+
+# Vim-script comment characters
+\# <char-0x00a3>               Line should not match as a Vim9-script comment
+" “                            Line should not match as a legacy-script comment
+: #                            Line should not match as a Vim9-script comment
diff --git a/runtime/syntax/testdir/input/vim9_legacy_header.vim b/runtime/syntax/testdir/input/vim9_legacy_header.vim
new file mode 100644
index 0000000000..66aeb39612
--- /dev/null
+++ b/runtime/syntax/testdir/input/vim9_legacy_header.vim
@@ -0,0 +1,16 @@
+" comment
+
+if !has('vim9script')
+  # 42 " comment
+  source foo.vim
+  finish
+endif
+
+" comment
+
+vim9script noclear
+
+# comment
+
+ # string only recognised with leading char
+ "useless string"
diff --git a/runtime/syntax/testdir/input/vim_ex_commands.vim b/runtime/syntax/testdir/input/vim_ex_commands.vim
index 571fd7ba1a..aaa351bd33 100644
--- a/runtime/syntax/testdir/input/vim_ex_commands.vim
+++ b/runtime/syntax/testdir/input/vim_ex_commands.vim
@@ -558,7 +558,7 @@
 :verbose
 :vertical
 :vim9cmd
-:vim9script
+" :vim9script
 :vimgrep
 :vimgrepadd
 :visual
@@ -1152,7 +1152,7 @@ call Foo() | version
 call Foo() | verbose
 call Foo() | vertical
 call Foo() | vim9cmd
-call Foo() | vim9script
+" call Foo() | vim9script
 call Foo() | vimgrep
 call Foo() | vimgrepadd
 call Foo() | visual
diff --git a/runtime/syntax/testdir/input/vim_ex_comment-vim9.vim b/runtime/syntax/testdir/input/vim_ex_comment-vim9.vim
new file mode 100644
index 0000000000..786d11b43f
--- /dev/null
+++ b/runtime/syntax/testdir/input/vim_ex_comment-vim9.vim
@@ -0,0 +1,41 @@
+vim9script
+
+# Vim comments
+
+# Vim9-script comment
+
+ # string only recognised with leading char
+ "useless string"
+
+function! Foo()
+  " Legacy-script comment
+  # 42 " comment
+endfunction
+
+def! Bar()
+  # Vim9-script comment
+  "useless string" # comment
+enddef
+
+command -count FooCommand {
+  # Vim9-script comment
+  "useless string" # comment
+}
+
+autocmd BufNewFile * {
+  # Vim9-script comment
+  "useless string" # comment
+}
+
+
+# Issue: #13047
+