First version

acs.vim

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+" Vim syntax file
+" Language: ACS (Doom actionscript)
+" Maintainer: Patrick Jakobsen
+" Latest Revision: 2021-12-18
+
+if exists("b:current_syntax")
+	finish
+endif
+
+syn keyword language_keywords script function  if while return while for switch case break default
+hi def link language_keywords Keyword
+syn keyword script_types OPEN ENTER RETURN RESPAWN DEATH LIGHTNING UNLOADING DISCONNECT KILL REOPEN net
+hi def link script_types Keyword
+
+syn keyword types int str bool
+hi def link types Type
+
+syn keyword TODO TODO FIXME XXX
+hi def link TODO Todo
+
+" @Spell means spell checking if I understand correctly.
+syn region line_comment start="//" end="$" contains=TODO,@Spell
+hi def link line_comment Comment
+syn region block_comment start="/\*" end="\*/" contains=TODO,@Spell
+hi def link block_comment Comment
+
+syn region string start=+"+ end=+"+
+hi def link string String
+syn keyword boolean_constant true false
+hi def link boolean_constant Boolean
+syn match number_constant "\<[0-9]*\>"
+hi def link number_constant Number
+
+let b:current_syntax = "acs"