Commit: runtime(ssa): improve syntax file performance (#14654)

[Christian Brabandt]

runtime(ssa): improve syntax file performance (#14654)

Commit: https://github.com/vim/vim/commit/f351fd82920427b33a160cab9fdbc35ac1deb681
Author: ObserverOfTime <chrono...@disroot.org>
Date: Sun Apr 28 17:22:55 2024 +0300

runtime(ssa): improve syntax file performance (https://github.com/vim/vim/issues/14654)

fixes: https://github.com/vim/vim/issues/14653

Signed-off-by: ObserverOfTime <chrono...@disroot.org>
Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/syntax/ssa.vim b/runtime/syntax/ssa.vim
index a5dbf37c3..3cfae816f 100644
--- a/runtime/syntax/ssa.vim
+++ b/runtime/syntax/ssa.vim
@@ -2,7 +2,7 @@
" Language: SubStation Alpha
" Maintainer: ObserverOfTime <chrono...@disroot.org>
" Filenames: *.ass,*.ssa
-" Last Change: 2022 Oct 10
+" Last Change: 2024 Apr 28

if exists('b:current_syntax')
finish
@@ -20,16 +20,20 @@ syn match ssaSection /^\[[a-zA-Z0-9+ ]\+\]$/
syn match ssaHeader /^[^;!:]\+:/ skipwhite nextgroup=ssaField

" Fields
-syn match ssaField /[^,]*/ contained skipwhite nextgroup=ssaDelimiter
+syn match ssaField /[^,]*\(,\|$\)/ contained skipwhite contains=ssaDelimiter,ssaTime nextgroup=ssaField

" Time
-syn match ssaTime /\d:\d\d:\d\d\.\d\d/ contained skipwhite nextgroup=ssaDelimiter
+syn match ssaTime /\d:\d\d:\d\d\.\d\d/ contained

" Delimiter
-syn match ssaDelimiter /,/ contained skipwhite nextgroup=ssaField,ssaTime,ssaText
+syn match ssaDelimiter /,/ contained
+
+" Dialogue
+syn match ssaDialogue /^Dialogue:/ transparent skipwhite nextgroup=ssaDialogueFields
+syn match ssaDialogueFields /\([^,]*,\)\{9\}/ contained transparent skipwhite contains=ssaField,ssaDelimiter nextgroup=ssaText

" Text
-syn match ssaText /\(^Dialogue:\(.*,\)\{9}\)\@<=.*$/ contained contains=@ssaTags,@Spell
+syn match ssaText /.*$/ contained contains=@ssaTags,@Spell
syn cluster ssaTags contains=ssaOverrideTag,ssaEscapeChar,ssaTextComment,ssaItalics,ssaBold,ssaUnderline,ssaStrikeout

" Override tags
@@ -60,4 +64,4 @@ hi ssaItalics cterm=italic gui=italic
hi ssaStrikeout cterm=strikethrough gui=strikethrough
hi ssaUnderline cterm=underline gui=underline

-let b:current_syntax = 'srt'
+let b:current_syntax = 'ssa'