Closed dbitouze closed 1 year ago
Hi @dbitouze , well, this is expected behavior. The reference type is inferred from the current counter, if there's no counter, there's no (automatic) way to tell. It's the same thing with the standard referencing system. Page references always get the page where \label
is called, but the reference itself is taken from the last numbered object, usually the one to have last called \refstepcounter
, which sets both \@currentlabel
and \@currentcounter
.
If you put a section in your document, that lemma
reference won't think its name is missing, but will believe it is a section, rather than a lemma. So, the reason name-sg
is undefined in your document is that there's no previous (global) call to \refstepcounter
. The theorem does call it once (I think), but sets \@currentcounter
locally within the environment.
zref-clever
lets you force the type for it:
\AddToHook{env/lemma/begin}{\zcsetup{reftype=lemma}}
But if you try a regular reference to the same label, you'll still get the wrong number. Same thing for hyperlinks, that's why \phantomsection
exists. For example:
\documentclass{article}
\usepackage{amsthm}
\usepackage{zref-clever}
\usepackage{hyperref}
\newtheorem{theorem}{Theorem}
\newtheorem*{lemma}{Lemma}
\AddToHook{env/lemma/begin}{\zcsetup{reftype=lemma}}
\begin{document}
\setcounter{section}{5}
\section{Section 1}
\begin{theorem}\zlabel{theorem}
A theorem.
\end{theorem}
Cf. \zcref{theorem} \zcpageref{theorem}.\par
Cf. \zcref[noref]{theorem} \zcpageref{theorem}.
\newpage
\begin{lemma}\zlabel{lemma}
A lemma.
\end{lemma}
Cf. \zcref[noref]{lemma} \zcpageref{lemma}
\zcref{lemma} % that's the number of Section 1, and it links to Theorem 1,
% since hyperref sets the anchors globally.
\end{document}
Regarding:
It would be nice for
\zcref
to display the name of unnumbered objects (and BTW, to not require the user to resort thenoref
option for them and to automatically display only the name for such unnumbered objects).
Again, it's the same thing as with the standard referencing system, everything is tailored to work for numbered objects. And there's a reason for it, it is really hard to know what to do in their absence.
Indeed, thanks!
The following MCE points out that
\zcref
doesn't display the name of unnumbered objects.Indeed, though
\zcpageref{lemma}
gives the right page number,\zcref[noref]{lemma}
doesn't display anything, and we are warned about this by the following message:which looks odd since there's no (obvious) reason for
name-sg
to not be defined in such a case.It would be nice for
\zcref
to display the name of unnumbered objects (and BTW, to not require the user to resort thenoref
option for them and to automatically display only the name for such unnumbered objects).