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Core: IsDoubleWidth (thanks ismail)

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git-svn-id: svn://ultimatepp.org/upp/trunk@13710 f0d560ea-af0d-0410-9eb7-867de7ffcac7
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cxl 2019-11-23 10:47:03 +00:00
parent e5b004d40a
commit 1bb18b43bd
4 changed files with 34 additions and 10 deletions
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21
uppsrc/Core/CharSet.cpp
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@ -2296,4 +2296,25 @@ String ToLowerAscii(const String& s, byte charset)
return r;
}
bool IsDoubleWidth(int c)
{
// This function is taken from Markus Kuhn's wcwidth implementation.
// For license and implementation details, see:
// https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
return c >= 0x1100
&& (c <= 0x115F // Hangul Jamo init. consonants
|| c == 0x2329
|| c == 0x232A
|| (c >= 0x2E80 && c <= 0xA4CF && c != 0x303F) // CJK ... Yi
|| (c >= 0xAC00 && c <= 0xD7A3) // Hangul syllables
|| (c >= 0xF900 && c <= 0xFAFF) // CJK compatibility ideographs
|| (c >= 0xFE10 && c <= 0xFE19) // Vertical forms
|| (c >= 0xFE30 && c <= 0xFE6F) // CJK compatibility forms
|| (c >= 0xFF00 && c <= 0xFF60) // Fullwidth forms
|| (c >= 0xFFE0 && c <= 0xFFE6)
|| (c >= 0x20000 && c <= 0x2FFFD)
|| (c >= 0x30000 && c <= 0x3FFFD)
);
}
}