Method aux

src/jrd/Collation.cpp:690–815

Evaluate the "sleuth" search operator.

private:
	// Evaluate the "sleuth" search operator.
	static bool aux(Jrd::TextType* obj, USHORT flags,
		const CharType* search, const CharType* end_search,
		const CharType* match, const CharType* end_match)
	{
		fb_assert(search != NULL);
		fb_assert(end_search != NULL);
		fb_assert(match != NULL);
		fb_assert(end_match != NULL);
		fb_assert(search <= end_search);
		fb_assert(match <= end_match);
		fb_assert(obj->getCanonicalWidth() == sizeof(CharType));

		while (match < end_match)
		{
			CharType c = *match++;
			if ((c == *(CharType*) obj->getCanonicalChar(CHAR_GDML_QUOTE) && (c = *match++)) ||
				(size_t(c) < FB_NELEM(SLEUTH_SPECIAL) && !SLEUTH_SPECIAL[c]))
			{
				if (match >= end_match || *match != *(CharType*) obj->getCanonicalChar(CHAR_GDML_MATCH_ANY))
				{
					if (search >= end_search)
						return false;
					const CharType d = *search++;
					if (c != d)
						return false;
				}
				else
				{
					++match;
					for (;;)
					{
						if (aux(obj, flags, search, end_search, match, end_match))
							return true;

						if (search < end_search)
						{
							const CharType d = *search++;
							if (c != d)
								return false;
						}
						else
							return false;
					}
				}
			}
			else if (c == *(CharType*) obj->getCanonicalChar(CHAR_GDML_MATCH_ONE))
			{
				if (match >= end_match || *match != *(CharType*) obj->getCanonicalChar(CHAR_GDML_MATCH_ANY))
				{
					if (search >= end_search)
						return false;

					search++;
				}
				else
				{
					if (++match >= end_match)
						return true;