private static boolean number(Text t, DataType requiredType, List<Object> valueList) {
// posNumber
// : cardinality
// | '0b' BinaryDigits+ [zZ]?
// | '0x' HexDigit+ [zZ]?
// | '-'? Pint? ( '.' Digit+ ) ('e' Pint) [fF]
// | '-'? Pint [zZfF]?
// ;
final boolean result;
assert !t.isEof() : "Should have been checked by caller";
if (binary(t, valueList, requiredType) || hex(t, valueList, requiredType)) {
// ?todo I could allow negatives here
// ( binary | hex | '0' )
result = true;
} else {
// ( Int DecPart | Int | DecPart ) ( 'e' Int )? [zZfF]?
final int start = t.cursor();
if ((t.consumeInt() && (decPart(t) || true) && (exponent(t) || true))
|| (t.consume('-') || true) && decPart(t) && (exponent(t) || true)) {
final String string = t.getString(start);
final Object value = deriveType(string, requiredType, t, 10);
valueList.add(value);
result = true;
} else {
result = false;
}
}
return result;
}
private static boolean exponent(Text t) {
final boolean result;
// 'e' Int
final int save = t.cursor();
if (t.consume('e') && t.consumeInt()) {
result = true;
} else {
t.setCursor(save);
result = false;
}
return result;
}