I've been studying this bug a bit and think I know where the problem is, more or less. The attached file is as minimal as I can get it. The change of font is crucial. Without it, there is no crash.
Font::writeLatexEndChanges we have this code:
if (open_encoding_) {
// We need to close the encoding even if it does not change
// to do correct environment nesting
Encoding const * const ascii = encodings.getFromLyXName("ascii");
int const c = switchEncoding(os, bparams,
runparams.moving_arg, *(runparams.encoding),
*ascii);
BOOST_ASSERT(c > 0);
count += c;
runparams.encoding = ascii;
open_encoding_ = false;
}
It's the c>0 assertion that's triggering the crash. Now look at the
switchEncoding code that it hits:
int switchEncoding(odocstream & os, BufferParams const & bparams,
bool moving_arg, Encoding const & oldEnc,
Encoding const & newEnc)
{
[snip]
docstring const inputenc(from_ascii(newEnc.latexName()));
switch (newEnc.package()) {
case Encoding::none:
return 0;
case Encoding::inputenc: {
[snip]
}
case Encoding::CJK: {
[snip]
}
}
This is going to return 0, since the call to switchEncoding()
essentially hardcoded newEnc as ascii =
encodings.getFromLyXName("ascii"), and ascii->package() is
Encoding::none. That's clearly not what was wanted. The comment in
latexWriteEndChanges was: "We need to close the encoding even if it does
not change to do correct environment nesting". Passing *ascii doesn't do
that. You could pass a null pointer as a flag to force the encoding
closed, but there are other ways you COULD return 0. But maybe if we put
this right at the very beginning:
if (!newEnc) {
if (oldEnc.package() == Encoding::CJK) {
os << "\\end{CJK}";
return 9;
}
os << "{}"; // ugly hack
return 2;
}
Or something like that.
There's other weirdness here. Why do we get here anyway? This is above:
if (oldEnc.package() == Encoding::none
|| newEnc.package() == Encoding::none)
return 0;
I'm guessing that ought to have more parentheses.
Richard
--
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Richard G Heck, Jr
Professor of Philosophy
Brown University
http://frege.brown.edu/heck/
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encoding.lyx
Description: application/lyx
