package net.sourceforge.phpdt.internal.compiler.ast;

/**
 * Any expression that have an operator.
 * @author Matthieu Casanova
 */
public abstract class OperatorExpression
    extends Expression
    implements OperatorIds {

  public int operator;

  public OperatorExpression(int operator, int sourceStart, int sourceEnd) {
    super(sourceStart, sourceEnd);
    this.operator = operator;
  }

	public String operatorToString() {
		switch (operator) {
			case EQUAL_EQUAL :
				return "=="; //$NON-NLS-1$
			case LESS_EQUAL :
				return "<="; //$NON-NLS-1$
			case GREATER_EQUAL :
				return ">="; //$NON-NLS-1$
			case NOT_EQUAL :
				return "!="; //$NON-NLS-1$
			case LEFT_SHIFT :
				return "<<"; //$NON-NLS-1$
			case RIGHT_SHIFT :
				return ">>"; //$NON-NLS-1$
			case UNSIGNED_RIGHT_SHIFT :
				return ">>>"; //$NON-NLS-1$
			case OR_OR :
				return "||"; //$NON-NLS-1$
			case AND_AND :
				return "&&"; //$NON-NLS-1$
			case PLUS :
				return "+"; //$NON-NLS-1$
			case MINUS :
				return "-"; //$NON-NLS-1$
			case NOT :
				return "!"; //$NON-NLS-1$
			case REMAINDER :
				return "%"; //$NON-NLS-1$
			case XOR :
				return "^"; //$NON-NLS-1$
			case AND :
				return "&"; //$NON-NLS-1$
			case MULTIPLY :
				return "*"; //$NON-NLS-1$
			case OR :
				return "|"; //$NON-NLS-1$
			case TWIDDLE :
				return "~"; //$NON-NLS-1$
			case DIVIDE :
				return "/"; //$NON-NLS-1$
			case GREATER :
				return ">"; //$NON-NLS-1$
			case LESS :
				return "<"; //$NON-NLS-1$
			case ORL :
				return "OR"; //$NON-NLS-1$
      case ANDL :
        return "AND"; //$NON-NLS-1$
      case DOT :
        return "."; //$NON-NLS-1$
      case DIF :
        return "<>"; //$NON-NLS-1$
      case BANG_EQUAL_EQUAL :
        return "!=="; //$NON-NLS-1$
      case EQUAL_EQUAL_EQUAL :
        return "==="; //$NON-NLS-1$
      case AT :
        return "@"; //$NON-NLS-1$
		};
		return "unknown operator"; //$NON-NLS-1$
	}

  public String toStringExpression(){
		//subclass redefine toStringExpressionNoParenthesis()
		return	"(" + toStringExpressionNoParenthesis() + ")";  //$NON-NLS-2$ //$NON-NLS-1$
	}

	public abstract String toStringExpressionNoParenthesis();
}