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Implement on screen numbering for Subequation module

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The module subequation allows to number equations in the "Subfigure"
inset to be numbered (1a), (1b), (1c), etc.

To implement this on screen, we need to redefine temporarily the
"equation" counter to use this different numbering.

To this end, implement Counters::copy method that can be used to
backup full counter definitions.

Fixes bug #12567.
This commit is contained in:
Jean-Marc Lasgouttes 2022-07-23 00:56:07 +02:00
parent ad3e6c69b2
commit c6f35b6ad6
3 changed files with 36 additions and 0 deletions
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10
src/Counters.cpp
View File

@ -421,6 +421,16 @@ void Counters::reset(docstring const & match)
}
bool Counters::copy(docstring const & cnt, docstring const & newcnt)
{
auto const it = counterList_.find(cnt);
if (it == counterList_.end())
return false;
counterList_[newcnt] = it->second;
return true;
}
bool Counters::remove(docstring const & cnt)
{
bool retval = counterList_.erase(cnt);

2
src/Counters.h
View File

@ -162,6 +162,8 @@ public:
void reset();
/// Reset counters matched by match string.
void reset(docstring const & match);
/// Copy counter \p cnt to \p newcnt.
bool copy(docstring const & cnt, docstring const & newcnt);
/// Remove counter \p cnt.
bool remove(docstring const & cnt);
/** returns the expanded string representation of counter \c

24
src/insets/InsetFlex.cpp
View File

@ -24,6 +24,7 @@
#include "ParIterator.h"
#include "TextClass.h"
#include "support/debug.h"
#include "support/gettext.h"
#include "support/lstrings.h"
@ -149,6 +150,29 @@ void InsetFlex::updateBuffer(ParIterator const & it, UpdateType utype, bool cons
docstring custom_label = translateIfPossible(il.labelstring());
Counters & cnts = bp.documentClass().counters();
// Special case for `subequations' module.
if (il.latextype() == InsetLaTeXType::ENVIRONMENT &&
il.latexname() == "subequations") {
docstring equation(from_ascii("equation"));
docstring parentequation(from_ascii("parentequation"));
cnts.step(equation, utype);
// save a copy of the equation counter definition
cnts.copy(equation, parentequation);
// redefine the equation counter definition
docstring const eqlabel =
cnts.theCounter(equation, it->getParLanguage(bp)->code());
cnts.newCounter(equation, parentequation,
eqlabel + from_ascii("\\alph{equation}"),
eqlabel + from_ascii("\\alph{equation}"),
cnts.guiName(parentequation));
InsetCollapsible::updateBuffer(it, utype, deleted);
// reset equation counter as it was.
cnts.copy(parentequation, equation);
cnts.remove(parentequation);
return;
}
docstring const & count = il.counter();
bool const have_counter = cnts.hasCounter(count);
if (have_counter) {