returnrefstatement.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 83 行

/*
 * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.quercus.program;

import com.caucho.quercus.Location;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.NullValue;
import com.caucho.quercus.env.Value;
import com.caucho.quercus.expr.Expr;

/**
 * Represents a return expression statement in a PHP program.
 */
public class ReturnRefStatement extends Statement {
  protected Expr _expr;
  
  /**
   * Creates the echo statement.
   */
  public ReturnRefStatement(Location location, Expr expr)
  {
    super(location);

    _expr = expr;
  }

  /**
   * Executes the statement, returning the expression value.
   */
  public Value execute(Env env)
  {
    try {
      if (_expr != null) {
        // php/0750
        return _expr.evalRef(env);
      }
      else
        return NullValue.NULL;
    }
    catch (RuntimeException e) {
      rethrow(e, RuntimeException.class);
    }

    return null;
  }

  /**
   * Returns true if control can go past the statement.
   */
  public int fallThrough()
  {
    return RETURN;
  }
}