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/*****************************************************************************
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* Copyright (c) 2000 - 2011, Lawrence Livermore National Security, LLC
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#ifndef EXPRPARSER_H
#define EXPRPARSER_H
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#include <expr_exports.h>
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#include <VisItParser.h>
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#include <ExprScanner.h>
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#include <string>
#include <ExprNode.h>
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#include <ExprNodeFactory.h>
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// ****************************************************************************
//  Class:  ExprParser
//
//  Purpose:
//    Implementation of a parser for the Expression grammar.
//
//  Programmer:  Jeremy Meredith
//  Creation:    April  5, 2002
//
//  Modifications:
//    Brad Whitlock, Fri Jun 28 15:20:36 PST 2002
//    Changed the name of the base class.
//
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//    Jeremy Meredith, Mon Jul 28 16:54:47 PDT 2003
//    Add the ability to set the error reporting message target to 
//    the console, the viewer error message mechanism, or neither.
//
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//    Jeremy Meredith, Fri Aug 15 09:25:04 PDT 2003
//    Renamed EMT_VIEWER to EMT_COMPONENT and added EMT_EXCEPTION.
//
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//    Jeremy Meredith, Wed Nov 24 11:55:13 PST 2004
//    Refactored.  There's a new base class for the ExprParser and the
//    return types became more general.
//
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//    Jeremy Meredith, Tue Dec 28 11:18:09 PST 2004
//    Added the current parse text as a data member to help with macro
//    support.
//
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// ****************************************************************************

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class EXPR_API ExprParser : public Parser
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{
  public:
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    ExprParser(ExprNodeFactory *f);
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    virtual ~ExprParser();
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    ParseTreeNode *Parse(const std::string &);
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    enum ErrorMessageTarget
    {
        EMT_NONE,
        EMT_CONSOLE,
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        EMT_COMPONENT,
        EMT_EXCEPTION
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    };
    static void SetErrorMessageTarget(const ErrorMessageTarget emt)
    {
        errorMessageTarget = emt;
    }

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  protected:
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    ParseTreeNode *ApplyRule(const Symbol&, const Rule*,
                           std::vector<ParseTreeNode*>&,
                           std::vector<Token*>&, Pos);
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  private:
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    std::string text; // the current parse text

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    ExprScanner scanner;
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    ExprNodeFactory *factory;
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    static ErrorMessageTarget errorMessageTarget;
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};

#endif