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Token.h 4.25 KB
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/*****************************************************************************
*
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* Copyright (c) 2000 - 2015, Lawrence Livermore National Security, LLC
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* Produced at the Lawrence Livermore National Laboratory
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* LLNL-CODE-442911
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* All rights reserved.
*
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* This file is  part of VisIt. For  details, see https://visit.llnl.gov/.  The
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* full copyright notice is contained in the file COPYRIGHT located at the root
* of the VisIt distribution or at http://www.llnl.gov/visit/copyright.html.
*
* Redistribution  and  use  in  source  and  binary  forms,  with  or  without
* modification, are permitted provided that the following conditions are met:
*
*  - Redistributions of  source code must  retain the above  copyright notice,
*    this list of conditions and the disclaimer below.
*  - Redistributions in binary form must reproduce the above copyright notice,
*    this  list of  conditions  and  the  disclaimer (as noted below)  in  the
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*    documentation and/or other materials provided with the distribution.
*  - Neither the name of  the LLNS/LLNL nor the names of  its contributors may
*    be used to endorse or promote products derived from this software without
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*    specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT  HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR  IMPLIED WARRANTIES, INCLUDING,  BUT NOT  LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND  FITNESS FOR A PARTICULAR  PURPOSE
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* ARE  DISCLAIMED. IN  NO EVENT  SHALL LAWRENCE  LIVERMORE NATIONAL  SECURITY,
* LLC, THE  U.S.  DEPARTMENT OF  ENERGY  OR  CONTRIBUTORS BE  LIABLE  FOR  ANY
* DIRECT,  INDIRECT,   INCIDENTAL,   SPECIAL,   EXEMPLARY,  OR   CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT  LIMITED TO, PROCUREMENT OF  SUBSTITUTE GOODS OR
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*****************************************************************************/

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#ifndef TOKEN_H
#define TOKEN_H
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#include <parser_exports.h>
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#include <string>
#include <stdlib.h>
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#include <Pos.h>
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#define EOF_TOKEN_ID 256

/*
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enum TokenType {
    TT_NoToken    = 0,
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    TT_EOF        = EOF_TOKEN_ID,
    ... your tokens here ...
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};
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*/
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PARSER_API std::string GetTokenTypeString(int t);
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// ****************************************************************************
//  Class:  Token
//
//  Purpose:
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//    Base class of all tokens.  Inside a parse tree, tokens are
//    contained in TokenParseTreeNode objects, which will often be
//    leaf elements of a parse tree.
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//
//  Programmer:  Jeremy Meredith
//  Creation:    April  5, 2002
//
//  Modifications:
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//    Sean Ahern, Thu Apr 18 11:25:16 PDT 2002
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//    Made the base class ExprParseTreeNode so that I can separate out the
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//    code that talks to the engine.
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//
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//    Sean Ahern, Wed Oct 16 16:41:59 PDT 2002
//    Moved the engine communication code to a separate set of classes
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//    that are owned by the viewer.  I may collapse ExprParseTreeNode again.
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//
//    Jeremy Meredith, Wed Jun  9 10:20:08 PDT 2004
//    Added GetValue to BoolConst.
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//
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//    Jeremy Meredith, Wed Nov 24 12:11:33 PST 2004
//    Major refactoring.  First, moved all VisIt Expression specific tokens
//    to a new file (ExprToken).  Second, Token no longer derives from
//    the parse tree node class -- instead, there is a specific parse tree
//    node type (TokenParseTreeNode) that contains a token.  This avoids
//    virtual (diamond) inheritance for tokens.
//
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// ****************************************************************************
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class PARSER_API Token
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{
  public:
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    Token(const Pos &p, int t) : pos(p), type(t) { }
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    virtual ~Token() { }
    int GetType() const { return type; }
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    const Pos &GetPos() const {return pos;}
    Pos       &GetPos()       {return pos;}
    virtual void PrintNode(ostream &o) { o << "Unknown Token\n"; }
 protected:
    Pos pos;
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    int type;
};

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class PARSER_API EndOfInput : public Token
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{
  public:
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    EndOfInput(const Pos &p) : Token(p, EOF_TOKEN_ID) { }
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    virtual ~EndOfInput() { }
    virtual void PrintNode(ostream &o) { o << "<<EOF>>\n"; }
};


#endif