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/*****************************************************************************
*
* Copyright (c) 2000 - 2017, Lawrence Livermore National Security, LLC
* Produced at the Lawrence Livermore National Laboratory
* LLNL-CODE-442911
* All rights reserved.
*
* This file is part of VisIt. For details, see https://visit.llnl.gov/. The
* 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
* 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
* 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
* 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
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*****************************************************************************/
#ifndef EXPRSCANNER_H
#define EXPRSCANNER_H
#include <expr_exports.h>
#include <string.h>
#include <visitstream.h>
#include <string>
#include <deque>
#include <Scanner.h>
#include <ExprToken.h>
// ****************************************************************************
// Class: ExprScanner
//
// Purpose:
// A table-driven scanner for the VisIt expression language.
//
// Note: State transition diagram is in the doc files states.jpg/states.dia.
//
// Programmer: Jeremy Meredith
// Creation: April 2, 2002
//
// Modifications:
// Jeremy Meredith, Thu Nov 11 15:36:55 PST 2004
// Added a new interface base class to allow other kinds of scanners.
//
// Jeremy Meredith, Wed Nov 24 12:01:44 PST 2004
// Major refactoring caused this class to be renamed to ExprScanner
// and Token to ExprToken.
//
// Jeremy Meredith, Wed Jul 23 13:37:20 EDT 2008
// Allow the character type to take into account a backslash-escape.
//
// ****************************************************************************
class EXPR_API ExprScanner : public Scanner
{
public:
ExprScanner() { }
virtual ~ExprScanner() { }
// These are the characters belonging to each character class:
/*
Quo "
Sgn + -
Sym * / + - [ ] { } ( ) < > = , ^ % @ :
Eee e E
Alp a-z A-Z _
Dig 0-9
Dot .
*/
enum CharType {
Quo = 0,
Sgn = 1,
Sym = 2,
Eee = 3,
Alp = 4,
Dig = 5,
Dot = 6,
Spc = 7,
Err
};
// Certain characters get scanned differently in different states
enum ScanState {
Normal,
FileSpec,
TimeSpec,
VarSpec
};
public:
void SetInput(const std::string &);
Token *ScanOneToken();
private:
int GetCharType(const char c, bool escaped) const;
Token *GetAcceptToken(const Pos&,const std::string&, int);
void UpdateScanState(const std::string &parsed);
// All state for scanning
std::string text;
int state;
std::deque<ScanState> scanstate;
int pos;
int lastacceptstate;
std::string lastacceptstring;
int lastacceptpos;
};
#endif
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