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dot: replace large labels by "(label too long)"

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Based on a report by Victor Khomenko.

* spot/twaalgos/dot.cc: Here.
* tests/core/readsave.test: Add test case.
* NEWS: Mention it.
This commit is contained in:
Alexandre Duret-Lutz 2019-05-18 13:46:33 +02:00
parent f476483f4a
commit 89fcd2b455
3 changed files with 19 additions and 1 deletions
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10
spot/twaalgos/dot.cc
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@ -444,7 +444,15 @@ namespace spot
print_sclatex_psl(os << '$', f) << '$';
return os;
}
return escape_for_output(os, str_psl(f));
// GraphViz (2.40.1) has a strict limit of 16k for label
// length. The limit we use below is more conservative,
// because (1) escaping the html element in the string
// (e.g., "&" -> "&amp;") can increase it a lot, and (2)
// a label of size 2048 is already unreasonable to display.
std::string s = str_psl(f);
if (s.size() > 2048)
s = "(label too long)";
return escape_for_output(os, s);
}
std::ostream&