Example #1
0
  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;
  }
Example #2
0
  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;
  }