From 88d09deb893505c936316537673cfbf30be47558 Mon Sep 17 00:00:00 2001
From: Ingo Schwarze <schwarze@openbsd.org>
Date: Wed, 8 Jun 2022 13:23:57 +0000
Subject: Surprisingly, every escape sequence can also be used as an argument
 delimiter for an outer escape sequence, in which case the delimiting escape
 sequence retains its syntax but usually ignores its argument and loses its
 inherent effect.  Add rudimentary support for this syntax quirk in order to
 improve parsing compatibility with groff.

---
 regress/roff/esc/w.in | 38 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

(limited to 'regress/roff/esc/w.in')

diff --git a/regress/roff/esc/w.in b/regress/roff/esc/w.in
index a7b32828..e6ee6be7 100644
--- a/regress/roff/esc/w.in
+++ b/regress/roff/esc/w.in
@@ -1,5 +1,5 @@
-.\" $OpenBSD: w.in,v 1.3 2017/07/04 14:53:27 schwarze Exp $
-.Dd $Mdocdate: July 4 2017 $
+.\" $OpenBSD: w.in,v 1.4 2022/06/08 13:08:00 schwarze Exp $
+.Dd $Mdocdate: June 8 2022 $
 .Dt ESC-W 1
 .Os
 .Sh NAME
@@ -13,5 +13,39 @@ character: \w'n'
 blank: \w' '
 .br
 text: \w'text'
+.Ss Argument delimiters
+unsupported \er: \w\rM\ru
+.br
+ignored \e&: \w\&M\&u
+.br
+useless \e.: \w\.M.u
+.br
+invalid \eG: \w\GMGu
+.br
+special \e-: \w\-M\-u
+.br
+break \ep: \w\pM\pu
+.br
+nospace \ec: \w\cM\cu
+.\".br
+.\"XXX skipchar \ec: \w\zM\zu
+.br
+.ds mystr xMxu
+string expansion: \w\*[mystr]
+.br
+.nr myreg 121
+register expansion: \w\n[myreg]u
+.br
+ignored \eON: \w\O1M\O2u
+.br
+special character: \w\(hyM\(hyu
+.br
+ignored \eZ\(aqstr\(aq: \w\Z'foo'M\Z'bar'u
+.br
+horizontal motion: \w\h'1'M\h'3'u
+.br
+horizontal line: \w\l'4'M\l'2'u
+.br
+overstrike: \w\o'ab'M\o'cd'u
 .br
 unterminated: \w'foo
-- 
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