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Fixed ASCII folding for non-foldable non-ASCII characters

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Problem: Add an object, name it using cyrilic, Slice, click Export: the proposed name is mangled. Affects all platforms, 2.2.0 was fine.

Cause: It is mangled during ASCII folding, which was broken with 28c0880 when it was generalized to be used from the fuzzy matcher.
    fold_to_ascii(wchar_t c, char *out) relies on narrowing char = wchar_t assignment, the old one used std::back_insert_iterator<std::wstring>.
    It is thus unable to leave a character alone even when it should (it should, right?).

Solution:
    1. Typed the fold_to_ascii function so it works on wchar_t only, which should mimic the old behaviour.
    2. Changed the respective call in fts_fuzzy_match.h. That function also works with wide char C-strings.

Cleanup:
    1. Removed the unused fold_utf8_to_ascii(const char *src) overload to avoid code duplication.
    2. Untemplated the fold_to_ascii(wchar_t c, std::back_insert_iterator<std::wstring>& out) function, it was never called with a different type.
    3. The function is now static in ASCIIFolding.cpp, nobody else needs to know.
This commit is contained in:
Lukas Matena 2020-12-18 21:22:26 +01:00
parent 1f5ac7d2f7
commit 78a3d8b63e
3 changed files with 17 additions and 29 deletions
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14
src/slic3r/Utils/ASCIIFolding.hpp
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@ -7,23 +7,13 @@ namespace Slic3r {
// If possible, remove accents from accented latin characters.
// This function is useful for generating file names to be processed by legacy firmwares.
extern std::string fold_utf8_to_ascii(const char *src);
extern std::string fold_utf8_to_ascii(const std::string &src);
// Convert the input UNICODE character to a string of maximum 4 output ASCII characters.
// Return the end of the string written to the output.
// The output buffer must be at least 4 characters long.
extern char* fold_to_ascii(wchar_t c, char *out);
extern wchar_t* fold_to_ascii(wchar_t c, wchar_t *out);
template<typename OUTPUT_ITERATOR>
void fold_to_ascii(wchar_t c, OUTPUT_ITERATOR out)
{
char tmp[4];
char *end = fold_to_ascii(c, tmp);
for (char *it = tmp; it != end; ++ it)
*out = *it;
}
}; // namespace Slic3r
} // namespace Slic3r
#endif /* slic3r_ASCIIFolding_hpp_ */