Method className

src/jrd/Collation.cpp:820–855

See if a character is a member of a class. Japanese version operates on short-based buffer, instead of SCHAR-based.

	// Japanese version operates on short-based buffer,
	// instead of SCHAR-based.
	static bool className(Jrd::TextType* obj, // USHORT flags,
		const CharType* char_class, const CharType* const end_class, CharType character)
	{
		fb_assert(char_class != NULL);
		fb_assert(end_class != NULL);
		fb_assert(char_class <= end_class);
		fb_assert(obj->getCanonicalWidth() == sizeof(CharType));

		bool result = true;

		if (*char_class == *(CharType*) obj->getCanonicalChar(CHAR_GDML_NOT))
		{
			++char_class;
			result = false;
		}

		while (char_class < end_class)
		{
			const CharType c = *char_class++;
			if (c == *(CharType*) obj->getCanonicalChar(CHAR_GDML_QUOTE))
			{
				if (*char_class++ == character)
					return true;
			}
			else if (*char_class == *(CharType*) obj->getCanonicalChar(CHAR_GDML_RANGE))
			{
				char_class += 2;
				if (character >= c && character <= char_class[-1])
					return result;
			}
			else if (character == c)
				return result;
		}

		return !result;
	}

	// Merge the matching pattern and control strings to give a cannonical
	// matching pattern.  Return the length of the combined string.