Update runtime files

runtime/syntax/ssa.vim

@@ -0,0 +1,63 @@
+" Vim syntax file
+" Language:	SubStation Alpha
+" Maintainer:	ObserverOfTime <chronobserver@disroot.org>
+" Filenames:	*.ass,*.ssa
+" Last Change:	2022 Oct 10
+
+if exists('b:current_syntax')
+    finish
+endif
+
+" Comments
+syn keyword ssaTodo TODO FIXME NOTE XXX contained
+syn match ssaComment /^\(;\|!:\).*$/ contains=ssaTodo,@Spell
+syn match ssaTextComment /{[^}]*}/ contained contains=@Spell
+
+" Sections
+syn match ssaSection /^\[[a-zA-Z0-9+ ]\+\]$/
+
+" Headers
+syn match ssaHeader /^[^;!:]\+:/ skipwhite nextgroup=ssaField
+
+" Fields
+syn match ssaField /[^,]*/ contained skipwhite nextgroup=ssaDelimiter
+
+" Time
+syn match ssaTime /\d:\d\d:\d\d\.\d\d/ contained skipwhite nextgroup=ssaDelimiter
+
+" Delimiter
+syn match ssaDelimiter /,/ contained skipwhite nextgroup=ssaField,ssaTime,ssaText
+
+" Text
+syn match ssaText /\(^Dialogue:\(.*,\)\{9}\)\@<=.*$/ contained contains=@ssaTags,@Spell
+syn cluster ssaTags contains=ssaOverrideTag,ssaEscapeChar,ssaTextComment,ssaItalics,ssaBold,ssaUnderline,ssaStrikeout
+
+" Override tags
+syn match ssaOverrideTag /{\\[^}]\+}/ contained contains=@NoSpell
+
+" Special characters
+syn match ssaEscapeChar /\\[nNh{}]/ contained contains=@NoSpell
+
+" Markup
+syn region ssaItalics start=/{\\i1}/ end=/{\\i0}/ matchgroup=ssaOverrideTag keepend oneline contained contains=@ssaTags,@Spell
+syn region ssaBold start=/{\\b1}/ end=/{\\b0}/ matchgroup=ssaOverrideTag keepend oneline contained contains=@ssaTags,@Spell
+syn region ssaUnderline start=/{\\u1}/ end=/{\\u0}/ matchgroup=ssaOverrideTag keepend oneline contained contains=@ssaTags,@Spell
+syn region ssaStrikeout start=/{\\s1}/ end=/{\\s0}/ matchgroup=ssaOverrideTag keepend oneline contained contains=@ssaTags,@Spell
+
+hi def link ssaDelimiter Delimiter
+hi def link ssaComment Comment
+hi def link ssaEscapeChar SpecialChar
+hi def link ssaField String
+hi def link ssaHeader Label
+hi def link ssaSection StorageClass
+hi def link ssaOverrideTag Special
+hi def link ssaTextComment Comment
+hi def link ssaTime Number
+hi def link ssaTodo Todo
+
+hi ssaBold cterm=bold gui=bold
+hi ssaItalics cterm=italic gui=italic
+hi ssaStrikeout cterm=strikethrough gui=strikethrough
+hi ssaUnderline cterm=underline gui=underline
+
+let b:current_syntax = 'srt'