/**
* Given the parsing context and what numerical data type is expected convert a string to the
* correct type. Note no attempt is made to let the magnitude of the number influence our choice.
*
* @param string The string to convert to a number. E.g. "123.3e2". If it contains a '.' or an 'e'
* then the type must either be f or F.
* @param requiredType Either z, Z, f, F or any.
* @param tb The source. The cursor will be at the end of the number but any type specifier will
* not have been consumed. If there is one then we'll eat it.
* @return The derived type.
* @throws ParsingException If there is a clash of types.
*/
private static Object deriveType(String string, DataType requiredType, Text t, int radix) {
final Object result;
// Figure out the correct type...
final DataType derivedType;
if (t.isEof()) {
if (requiredType == DataType.any) {
if (string.indexOf('.') >= 0 || string.indexOf('e') >= 0) {
derivedType = DataType.f;
} else {
derivedType = DataType.z;
}
} else {
derivedType = requiredType;
}
} else {
final char c = t.peek();
if (c == 'z' || c == 'Z' || c == 'f' || c == 'F') {
t.consume(c);
derivedType = DataType.valueOf(String.valueOf(c));
if (!(requiredType == DataType.any || requiredType == derivedType)) {
throw new ParsingException("Incompatible type: " + string + c);
}
} else {
if (requiredType == DataType.any) {
if (string.indexOf('.') >= 0 || string.indexOf('e') >= 0) {
derivedType = DataType.f;
} else {
derivedType = DataType.z;
}
} else {
derivedType = requiredType;
}
}
}
switch (derivedType) {
case z:
result = new Long(Long.parseLong(string, radix));
break;
case Z:
result = new BigInteger(string, radix);
break;
case f:
result = new Double(string);
break;
case F:
result = new BigDecimal(string);
break;
// $CASES-OMITTED$
default:
throw new UnexpectedException("toType: " + derivedType);
}
return result;
}
private static boolean any(Text t, List<Object> valueList) {
final boolean result;
// value
// : Text
// | Path
// | Date | Time | DateTime
// | 'null'
// | 'true' | 'false'
// | z | Z | f | F
// | Identifier
// | Cardinality
// ;
/*
* Try and parse a value, we don't know the type so use the first
* character as an indicator to jump to the right type.
*
* We know we're not EOF and "null" has been dealt with by the caller.
*/
final char c = t.peek();
if (c == '"') { // Text
result = text(t, valueList);
} else if (c == '`') { // Path
result = path(t, valueList);
} else if (c == '@') { // Temporal
result =
datetime(t, valueList) // Must be first
|| date(t, valueList)
|| time(t, valueList);
} else if (c >= '0' && c <= '9' || c == '.' || c == '-') {
result = cardinality(t, valueList) || number(t, DataType.any, valueList);
} else {
result =
bool(t, valueList) // Must be first
|| identifier(t, valueList);
}
return result;
}
