From 08c3e2b36ea383b45d25cdba84d4a1bcca4f9e51 Mon Sep 17 00:00:00 2001
From: Vadim Yanitskiy <vyanitskiy@sysmocom.de>
Date: Fri, 21 Jan 2022 19:31:37 +0600
Subject: [PATCH] syntax: fix highlighting of bin/hex/oct strings containing
 '?'

---
 syntax/ttcn.vim | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/syntax/ttcn.vim b/syntax/ttcn.vim
index cf672ae..a0998c1 100644
--- a/syntax/ttcn.vim
+++ b/syntax/ttcn.vim
@@ -169,10 +169,13 @@ syn match   ttcnNumber  "-infinity\>"
 syn keyword ttcnBool    true false
 syn keyword ttcnConst   omit null pass fail inconc none error
 syn region  ttcnString  start=/"/ end=/"/ skip=/\\"/ oneline
-syn match   ttcnString  /'[01]*'B/
-syn match   ttcnString  /'\x*'H/
-syn match   ttcnString  /'\(\x\x\)*'O/
-syn match   ttcnError   /'\x\(\x\x\)*'O/
+" In binary strings strings '?' matches one bit
+syn match   ttcnString  /'[01?]*'B/
+" In hexstrings '?' matches one nibble (4 bits)
+syn match   ttcnString  /'\(\x\|?\)*'H/
+" In octetstings '?' matches one octet (8 bits)
+syn match   ttcnString  /'\(\(\x\x\)\|?\)*'O/
+syn match   ttcnError   /'\x\(\(\x\x\)\|?\)*'O/
 
 " Comments
 if version < 700