/* (c) https://github.com/MontiCore/monticore */

/**
 * This grammar defines several literals for Integer.
 * The scope of this grammar is to
 * ease the reuse of literals structures in Java-like sublanguages, e.g., by
 * grammar inheritance or grammar embedment.
*/

component grammar MCNumbers extends de.monticore.MCBasics {

  /*========================================================================*/
  /*== Number ==============================================================*/
  /*========================================================================*/

  /** ASTNumber is the interface for longs
        @method getSource() String-representation.
        @method getValueInt() decoded value as int
        @method getValue() decoded value as long
    */
  interface Number;

  astrule Number =
    method public String getSource()
    { throw new UnsupportedOperationException(
      "0xFF230 Method not implemented"); }
    method public int getValueInt()
    { throw new UnsupportedOperationException(
      "0xFF231 Method not implemented"); }
    method public long getValue()
    { throw new UnsupportedOperationException(
      "0xFF232 Method not implemented"); }
  ;

  /*========================================================================*/
  /*== Decimal =============================================================*/
  /*========================================================================*/

  /** ASTDecimal represents a positive Decimal number.
        @attribute source String-representation.
    */
  Decimal implements Number =
    source:DecimalToken;

  astrule Decimal =
    method public int getValueInt() {
      return Integer.parseInt(getSource());
    }
    method public long getValue() {
      return Long.parseLong(getSource());
    }
  ;

  token DecimalToken
    = '0' | (NonZeroDigit Digit*);

  fragment token Digit = '0'..'9' ;

  fragment token NonZeroDigit = '1'..'9' ;

  /*========================================================================*/
  /*== Integer =============================================================*/
  /*========================================================================*/

  /** ASTInteger represents a positive or negative Decimal number.
        @attribute source String-representation.
    */
  Integer implements Number =
     (negative:["-"])? decimalpart:DecimalToken;

  astrule Integer =
    method public int getValueInt() {
      int a = Integer.parseInt(getDecimalpart());
      return negative ? -a : a;
    }
    method public long getValue() {
      long a = Long.parseLong(getDecimalpart());
      return negative ? -a : a;
    }
    // source is handcoded: it adds the "-"
    method public String getSource() {
      String s = getDecimalpart();
      return (negative ? "-" +s : s);
    }
  ;

}