Function fxCharSetRange

xs/sources/xsre.c:1096–1146

}

void* fxCharSetRange(txPatternParser* parser, txCharSet* set1, txCharSet* set2)
{
	if ((set1->strings == C_NULL) && (set2->strings == C_NULL)) {
		txCharSet* result;
		if (set1->characters[0] == 0)
			return set2;
		if (set2->characters[0] == 0)
			return set1;
		if ((set1->characters[0] != 2) || (set2->characters[0] != 2))
			fxPatternParserError(parser, gxErrors[mxInvalidRange]);
		if ((set1->characters[1] + 1 != set1->characters[2]) || (set2->characters[1] + 1 != set2->characters[2]))
			fxPatternParserError(parser, gxErrors[mxInvalidRange]);
		if ((set1->characters[1] > set2->characters[1]))
			fxPatternParserError(parser, gxErrors[mxInvalidRange]);
		if (parser->flags & XS_REGEXP_I) {
			txBoolean flag = (parser->flags & XS_REGEXP_UV) ? 1 : 0;
			txInteger begin = set1->characters[1];
			txInteger end = set2->characters[1];
			struct {
				txTermPart;
				txInteger stringCount;
				txString* strings;
				txInteger characters[3];
			} _set;
			txCharSet* set = (txCharSet*)&_set;
			set->next = C_NULL;
			set->dispatch.code = fxCharSetCode;
			set->stringCount = 0;
			set->strings = C_NULL;
			set->characters[0] = 2;
			result = fxCharSetEmpty(parser);
			while (begin <= end) {
				set->characters[1] = fxCharCaseCanonicalize(begin, flag);
				set->characters[2] = set->characters[1] + 1;
				result = fxCharSetCombine(parser, result, set, mxCharSetUnionOp);
				begin++;
			}
		}
		else {
			result = fxPatternParserCreateTerm(parser, sizeof(txCharSet) + (2 * sizeof(txInteger)), fxCharSetMeasure);
			result->stringCount = 0;
			result->strings = C_NULL;
			result->characters[0] = 2;
			result->characters[1] = set1->characters[1];
			result->characters[2] = set2->characters[2];
		}
		return result;
	}
	fxPatternParserError(parser, gxErrors[mxInvalidPattern]);
	return C_NULL;
}

void* fxCharSetSingle(txPatternParser* parser, txInteger character)
{