GNU bug report logs - #32089
RefTeX: Regexp for parsing labels in optional arguments

Previous Next

Full log

View this message in rfc822 format

From: Arash Esbati <arash.esbati <at> gmail.com>
To: 32089 <at> debbugs.gnu.org
Subject: bug#32089: RefTeX: Regexp for parsing labels in optional arguments
Date: Sat, 07 Jul 2018 23:11:26 +0200

Hi all,

please consider the following example:

--8<---------------cut here---------------start------------->8---
\documentclass{article}
\usepackage{listings}
\begin{document}

\begin{lstlisting}[
caption={Some caption},
label=lst:1]
Some code
\end{lstlisting}

\begin{lstlisting}[
caption={Some caption},
label=lst:2
]
Some code
\end{lstlisting}

\begin{lstlisting}[
caption = {Some caption},
label   = lst:3                   ]
Some code
\end{lstlisting}

\ref{lst:1}, \ref{lst:2
}, \ref{lst:3                   }

\ref{lst:1}, \ref{lst:2}, \ref{lst:3}

\end{document}
--8<---------------cut here---------------end--------------->8---

With RefTeX active, it fails to parse the labels defined in optional
arguments correctly (see the first set of \ref commands).  It is due to
the regex defined in `reftex-label-regexps' in `reftex-vars.el' which
expects one of ],} directly after the label.  With the following patch,
it parses the labels correctly:

--8<---------------cut here---------------start------------->8---
diff --git a/lisp/textmodes/reftex-vars.el b/lisp/textmodes/reftex-vars.el
index 11dbb8d..66d800d 100644
--- a/lisp/textmodes/reftex-vars.el
+++ b/lisp/textmodes/reftex-vars.el
@@ -895,7 +895,7 @@ DOWNCASE    t:   Downcase words before using them."
       "\\\\label{\\(?1:[^}]*\\)}"
       ;; keyvals [..., label = {foo}, ...] forms used by ctable,
       ;; listings, minted, ...
-      "\\[[^][]\\{0,2000\\}\\<label[[:space:]]*=[[:space:]]*{?\\(?1:[^],}]+\\)}?")
+      "\\[[^][]\\{0,2000\\}\\<label[[:space:]]*=[[:space:]]*{?\\(?1:[^], \t\n\r%}]+\\)}?")
     "List of regexps matching \\label definitions.
 The default value matches usual \\label{...} definitions and
 keyval style [..., label = {...}, ...] label definitions.  It is
 --8<---------------cut here---------------end--------------->8---

Any suggestion if I'm missing a character?  My next step would be to add
the same regexp to `LaTeX-auto-label-regexp-list' in order to make
AUCTeX also capable of this feature.  Any comments welcome.

Best, Arash

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.