// -*- mode: c++; c-basic-offset:4 -*-

// This file is part of libdap, A C++ implementation of the OPeNDAP Data

// Access Protocol.

// Copyright (c) 2002,2003 OPeNDAP, Inc.

// Author: James Gallagher <jgallagher@opendap.org>

//

// This library is free software; you can redistribute it and/or

// modify it under the terms of the GNU Lesser General Public

// License as published by the Free Software Foundation; either

// version 2.1 of the License, or (at your option) any later version.

//

// This library 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.  See the GNU

// Lesser General Public License for more details.

//

// You should have received a copy of the GNU Lesser General Public

// License along with this library; if not, write to the Free Software

// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

//

// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.

// (c) COPYRIGHT URI/MIT 1995-1999

// Please read the full copyright statement in the file COPYRIGHT_URI.

//

// Authors:

//      jhrg,jimg       James Gallagher <jgallagher@gso.uri.edu>

// Types for the expr parser.

//

// 11/4/95 jhrg

#ifndef _expr_h

#define _expr_h

#include <string>

#include <vector>

#include <Type.h>

namespace libdap

{

class BaseType;

class DDS;

class ConstraintEvaluator;

// VALUE is used to return constant values from the scanner to the parser.

// Constants are packaged in BaseType *s for evaluation by the parser.

typedef struct

{

    Type type;   // Type is an enum defined in Type.h

    union {

        unsigned int ui;

        int i;

        double f;

        std::string *s;

    } v;

} value;

// Syntactic sugar for `pointer to function returning boolean' (bool_func)

// and `pointer to function returning BaseType *' (btp_func). Both function

// types take four arguments, an integer (argc), a vector of BaseType *s

// (argv), the DDS for the dataset for which these function is being

// evaluated (analogous to the ENVP in UNIX) and a pointer for the function's

// return value. ARGC is the length of ARGV.

typedef void (*bool_func)(int argc, BaseType *argv[], DDS &dds, bool *result);

typedef void (*btp_func)(int argc, BaseType *argv[], DDS &dds, BaseType **btpp);

// Projection function: A function that appears in the projection part of the

// CE and is executed for its side-effect. Usually adds a new variable to

// the DDS. These are run _during the parse_ so their side-effects can be used

// by subsequent parts of the CE.

typedef void (*proj_func)(int argc, BaseType *argv[], DDS &dds, ConstraintEvaluator &ce);

// INT_LIST and INT_LIST_LIST are used by the parser to store the array

// indexes.

// To add the new feature of 'to the end' in an array projection (denoted using

// start), I used the value -1 for an index. This makes do difference here. jhrg

// 12/20/12

typedef std::vector<int> int_list;

typedef std::vector<int>::const_iterator int_citer ;

typedef std::vector<int>::iterator int_iter ;

typedef std::vector<int_list *> int_list_list;

typedef std::vector<int_list *>::const_iterator int_list_citer ;

typedef std::vector<int_list *>::iterator int_list_iter ;

} // namespace libdap

#endif /* _expr_h */