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

/**
 * @author Matthieu Casanova
 */
public class VarAssignation extends Expression {

  public static final int EQUAL = 0;
  public static final int PLUS_EQUAL = 1;
  public static final int MINUS_EQUAL = 2;
  public static final int STAR_EQUAL = 3;
  public static final int SLASH_EQUAL = 4;
  public static final int AND_EQUAL = 5;
  public static final int OR_EQUAL = 6;
  public static final int XOR_EQUAL = 7;
  public static final int DOT_EQUAL = 8;
  public static final int REM_EQUAL = 9;
  public static final int TILDE_EQUAL = 10;
  public static final int LSHIFT_EQUAL = 11;
  public static final int RSIGNEDSHIFT_EQUAL = 12;

  public char[] variable;
  public Expression expression;
  public int operator;


  public VarAssignation(char[] variable,
                        Expression expression,
                        int operator,
                        int sourceStart,
                        int sourceEnd) {
    super(sourceStart, sourceEnd);
    this.variable = variable;
    this.expression = expression;
    this.operator = operator;
  }

  public String operatorToString() {
    switch (operator) {
      case EQUAL:
        return "="; //$NON-NLS-1$
      case PLUS_EQUAL:
        return "+=";   //$NON-NLS-1$
      case MINUS_EQUAL:
        return "-=";   //$NON-NLS-1$
      case STAR_EQUAL:
        return "*="; //$NON-NLS-1$
      case SLASH_EQUAL:
        return "/="; //$NON-NLS-1$
      case AND_EQUAL:
        return "<="; //$NON-NLS-1$
      case OR_EQUAL:
        return "|=";//$NON-NLS-1$
      case XOR_EQUAL:
        return "^=";//$NON-NLS-1$
      case DOT_EQUAL:
        return ".="; //$NON-NLS-1$
      case REM_EQUAL:
        return "%="; //$NON-NLS-1$
      case TILDE_EQUAL:
        return " ="; //$NON-NLS-1$
      case LSHIFT_EQUAL:
        return "<<="; //$NON-NLS-1$
      case RSIGNEDSHIFT_EQUAL:
        return ">>="; //$NON-NLS-1$
    }
    return " unknown operator ";
  }

  /**
   * Return the expression as String.
   * @return the expression
   */
  public String toStringExpression() {
    final StringBuffer buff = new StringBuffer();
    buff.append(variable);
    buff.append(' ');
    buff.append(operatorToString());
    buff.append(' ');
    buff.append(expression.toStringExpression());
    return buff.toString();
  }
}