ConfigurationReader.cc

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/*
 * ConfigurationReader.cc
 *
 * Smalltalk like class library for C++
 * Configuration file reader.
 *
 * Copyright (c) 2004 Milan Cermak, Petr Stepanek
 */
/*
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <stlib/Character.h>
#include <stlib/EncodedStream.h>
#include <stlib/ExternalReadStream.h>
#include <stlib/GenericException.h>
#include <stlib/ReadStream.h>
#include <stlib/String.h>
#include <stlib/tools/Configuration.h>
#include <stlib/tools/Filename.h>
#include <stlib/tools/FileEncodedStreamFactory.h>

#include <stlib/tools/ConfigurationReader.h>

using namespace Tools;

/* Initialize-release protocol */
void ConfigurationReader::onFilename(String *filename)
{
    stream((new Filename(filename))->withEncoding("default")->readStream());
}

void ConfigurationReader::onString(String *str)
{
    stream(str->readStream());
}

void ConfigurationReader::stream(Stream *str)
{
    _stream = str;
}

/* Accessing protocol */
void ConfigurationReader::put(String *item, Object *value)
{
    _configuration->put(item, value);
}

/* Processing protocol */
Configuration *ConfigurationReader::readConfiguration(void)
{
    return readConfiguration(new Configuration);
}

Configuration *ConfigurationReader::readConfiguration(Configuration *configuration)
{
    _configuration = configuration;
    _ensure (
        read(),
        _stream->close()
    );

    return _configuration;
}

void ConfigurationReader::read(void)
{
    while (!_stream->atEnd()) {
        _stream->skipSeparators();
        readLine();
    }
}

void ConfigurationReader::readLine(void)
{
    String *item, *value;
    String *line = dynamic_cast<String *>(_stream->nextLine());
    long idx;

    line->replaceAll(Character::tab(), Character::space());

    /* Remove comments */
    idx = line->indexOf('#');
    if (idx > 0) line = dynamic_cast<String *>(line->copy(0, idx));
    line = line->trimBlanks();
    if (idx == 0 || line->isEmpty()) return;

    /* Parse assignment */
    idx = line->indexOf('=');
    if (idx <= 0) return;

    item = dynamic_cast<String *>(line->copy(0, idx))->trimBlanks();
    if (item->isEmpty()) return;

    if (idx + 1 < line->size())
        value = dynamic_cast<String *>(line->copy(idx + 1, line->size()))->trimBlanks();
    else
        value = new String;
    put(item, value);
}

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