content: /* Alloy Analyzer 4 -- Copyright (c) 2006-2009, Felix Chang
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files
   * (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify,
   * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
   * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
   * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   */
  
  package edu.mit.csail.sdg.ast;
  
  import edu.mit.csail.sdg.alloy4.Err;
  import edu.mit.csail.sdg.ast.Sig.Field;
  import edu.mit.csail.sdg.parser.Macro;
  
  /**
   * This abstract class defines what a Return Visitor's interface needs to be.
   */
  
  public abstract class VisitReturn<T> {
  
      /** Constructs a VisitReturn object. */
      public VisitReturn() {}
  
      /**
       * This is the start method that begins a traversal over the given expression.
       */
      public final T visitThis(Expr x) throws Err {
          return x.accept(this);
      }
  
      /** Visits a ExprBad node */
      public T visit(ExprBad x) throws Err {
          throw x.errors.pick();
      }
  
      /** Visits a ExprBadCall node */
      public T visit(ExprBadCall x) throws Err {
          throw x.errors.pick();
      }
  
      /** Visits a ExprBadJoin node */
      public T visit(ExprBadJoin x) throws Err {
          throw x.errors.pick();
      }
  
      /** Visits an ExprBinary node. */
      public abstract T visit(ExprBinary x) throws Err;
  
      /** Visits an ExprList node. */
      public abstract T visit(ExprList x) throws Err;
  
      /** Visits an ExprCall node. */
      public abstract T visit(ExprCall x) throws Err;
  
      /** Visits an ExprConstant node. */
      public abstract T visit(ExprConstant x) throws Err;
  
      /** Visits an ExprITE node. */
      public abstract T visit(ExprITE x) throws Err;
  
      /** Visits an ExprLet node. */
      public abstract T visit(ExprLet x) throws Err;
  
      /** Visits an ExprQt node. */
      public abstract T visit(ExprQt x) throws Err;
  
      /** Visits an ExprUnary node. */
      public abstract T visit(ExprUnary x) throws Err;
  
      /** Visits an ExprVar node. */
      public abstract T visit(ExprVar x) throws Err;
  
      /** Visits a Sig node. */
      public abstract T visit(Sig x) throws Err;
  
      /** Visits a Field node. */
      public abstract T visit(Field x) throws Err;
  
      /** Visits a Func node. */
      public abstract T visit(Func x) throws Err;
  
      /** Visists an Assert node. */
      public abstract T visit(Assert x) throws Err;
  
      /** Visits a Macro node. */
      public abstract T visit(Macro macro) throws Err;
  }
  