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

/**
 * A list expression.
 * it could be list($v1,$v2), list(,$v2) ...
 * @author Matthieu Casanova
 */
public class ListExpression extends Expression {

  public String[] vars;
  public Expression expression;

  public ListExpression(String[] vars,
                        Expression expression,
                        int sourceStart,
                        int sourceEnd) {
    super(sourceStart, sourceEnd);
    this.vars = vars;
    this.expression = expression;
  }

  public ListExpression(String[] vars,
                        int sourceStart,
                        int sourceEnd) {
    super(sourceStart, sourceEnd);
    this.vars = vars;
  }

  /**
   * Return the expression as String.
   * @return the expression
   */
  public String toStringExpression() {
    final StringBuffer buff = new StringBuffer("list(");
    for (int i = 0; i < vars.length; i++) {
      String var = vars[i];
      if (i != 0) {
        buff.append(", ");
      }
      if (var != null) {
        buff.append(var);
      }
    }
    if (expression != null) {
      buff.append(" = ");
      buff.append(expression.toStringExpression());
    }
    return buff.toString();
  }
}