DAS.cc

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// -*- 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 1994-1999
// Please read the full copyright statement in the file COPYRIGHT_URI.
//
// Authors:
//      jhrg,jimg       James Gallagher <jgallagher@gso.uri.edu>
 
// Methods for the class DAS - a class used to parse the dataset attribute
// structure.
//
// jhrg 7/25/94
 
#include "config.h"
 
#include <cstdio>
 
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
 
#ifdef WIN32
#include <io.h>
#endif
 
#include <iostream>
#include <string>
 
#include "AttrTable.h"
#include "DAS.h"
#include "DapIndent.h"
#include "Error.h"
#include "InternalErr.h"
#include "debug.h"
#include "escaping.h"
#include "parser.h"
 
using std::cerr;
using std::endl;
 
// Glue routines declared in das.lex
extern void das_switch_to_buffer(void *new_buffer);
extern void das_delete_buffer(void *buffer);
extern void *das_buffer(FILE *fp);
 
// extern void dasrestart(FILE *yyin);
// extern int dasparse(void *arg); // defined in das.tab.c
extern int dasparse(libdap::parser_arg *arg); // defined in das.tab.c
 
namespace libdap {
 
void DAS::duplicate(const DAS &src) {
    // If the container field is set, perform a deep copy
    if (src.d_container)
        d_container = new AttrTable(*src.d_container);
    else
        d_container = 0;
 
    d_container_name = src.d_container_name;
    d_attrs = src.d_attrs;
}
 
DAS &DAS::operator=(const DAS &rhs) {
    if (this == &rhs)
        return *this;
    duplicate(rhs);
    return *this;
}

void DAS::container_name(const string &cn) {
    // We want to find a top level attribute table with the given name. So
    // set d_container to null first so that we aren't searching some
    // previous container
    if (cn != d_container_name) {
        d_container = 0;
        if (!cn.empty()) {
            d_container = get_table(cn);
            if (!d_container) {
                d_container = add_table(cn, new AttrTable);
            }
        }
        d_container_name = cn;
    }
}

unsigned int DAS::get_size() const {
    if (d_container) {
        return d_container->get_size();
    }
    return d_attrs.get_size();
}

void DAS::erase() {
    if (d_container) {
        d_container->erase();
    } else {
        d_attrs.erase();
    }
}

AttrTable::Attr_iter DAS::var_begin() {
    if (d_container) {
        return d_container->attr_begin();
    }
    return d_attrs.attr_begin();
}

AttrTable::Attr_iter DAS::var_end() {
    if (d_container) {
        return d_container->attr_end();
    }
    return d_attrs.attr_end();
}

string DAS::get_name(AttrTable::Attr_iter &i) {
    if (d_container) {
        return d_container->get_name(i);
    }
    return d_attrs.get_name(i);
}

AttrTable *DAS::get_table(AttrTable::Attr_iter &i) {
    if (d_container) {
        return d_container->get_attr_table(i);
    }
    return d_attrs.get_attr_table(i);
}

AttrTable *DAS::get_table(const string &name) {
    if (d_container) {
        return d_container->get_attr_table(name);
    }
    return d_attrs.get_attr_table(name);
}



AttrTable *DAS::add_table(const string &name, AttrTable *at) {
    if (d_container) {
        at->set_is_global_attribute(false);
        return d_container->append_container(at, name);
    }
    return d_attrs.append_container(at, name);
}



void DAS::parse(string fname) {
    FILE *in = fopen(fname.c_str(), "r");
 
    if (!in) {
        throw Error(cannot_read_file, "Could not open: " + fname);
    }
 
    parse(in);
 
    int res = fclose(in);
    if (res) {
        DBG(cerr << "DAS::parse - Failed to close file " << (void *)in << endl;);
    }
}

void DAS::parse(int fd) {
#ifdef WIN32
    int new_fd = _dup(fd);
#else
    int new_fd = dup(fd);
#endif
 
    if (new_fd < 0)
        throw InternalErr(__FILE__, __LINE__, "Could not access file.");
    FILE *in = fdopen(new_fd, "r");
 
    if (!in) {
        throw InternalErr(__FILE__, __LINE__, "Could not access file.");
    }
 
    parse(in);
 
    int res = fclose(in);
    if (res) {
        DBG(cerr << "DAS::parse(fd) - Failed to close " << (void *)in << endl;);
    }
}

void DAS::parse(FILE *in) {
    if (!in) {
        throw InternalErr(__FILE__, __LINE__, "Null input stream.");
    }
 
    void *buffer = das_buffer(in);
    das_switch_to_buffer(buffer);
 
    parser_arg arg(this);
 
    // bool status = dasparse((void *) & arg) == 0;
    bool status = dasparse(&arg) == 0;
 
    das_delete_buffer(buffer);
 
    //  STATUS is the result of the parser function; if a recoverable error
    //  was found it will be true but arg.status() will be false.
    if (!status || !arg.status()) { // Check parse result
        if (arg.error())
            throw *arg.error();
    }
}


 
void DAS::print(FILE *out, bool dereference) {
    fprintf(out, "Attributes {\n");
 
    d_attrs.print(out, "    ", dereference);
 
    fprintf(out, "}\n");
}

 
void DAS::print(ostream &out, bool dereference) {
    out << "Attributes {\n";
 
    d_attrs.print(out, "    ", dereference);
 
    out << "}\n";
}

void DAS::dump(ostream &strm) const {
    strm << DapIndent::LMarg << "DAS::dump - (" << (void *)this << ")" << endl;
    DapIndent::Indent();
    if (d_container) {
        strm << DapIndent::LMarg << "current container: " << d_container_name << endl;
    } else {
        strm << DapIndent::LMarg << "current container: NONE" << endl;
    }
    d_attrs.dump(strm);
    DapIndent::UnIndent();
}
 
} // namespace libdap