HierarchyConfigReader.cc

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/*
 * HierarchyConfigReader.cc
 *
 * Smalltalk like class library for C++
 * Hierarchical configuration file reader.
 *
 * Copyright (c) 2004 Milan Cermak
 */
/*
 * 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/OrderedCollection.h>
#include <stlib/String.h>
#include <stlib/tools/Configuration.h>

#include <stlib/tools/HierarchyConfigReader.h>

namespace Tools {

/* Class-accessing protocol */
String *HierarchicalConfigurationReader::className(void) const
{
    return new String("HierarchicalConfigurationReader");
}

/* Processing protocol */
Configuration *HierarchicalConfigurationReader::readConfiguration(Configuration *configuration)
{
    stack = new OrderedCollection;
    return ConfigurationReader::readConfiguration(configuration);
}

void HierarchicalConfigurationReader::readLine(void)
{
    String *line = parseLine();

    if (line->isEmpty()) return;

    /* On backslash concatenate next line */
    while (line->last()->isEqual(Character::value('\\'))) {
        line = dynamic_cast<String *>(
                   line->copyReplace(line->size()-1, line->size(), parseLine()));
    }

    if (line->first()->isEqual(Character::value('}'))) {
        parseBlockClosing(line);
    } else {
        long idx;
        idx = line->indexOf('{');
        if (idx > 0 && idx < line->size()) {
            parseBlockOpenning(dynamic_cast<String *>(line->copy(0, idx-1)));
        } else {
            idx = line->indexOf('=');
            if (idx > 0 && idx < line->size()) {
                parseAssignment(line);
            }
        }
    }
}

String *HierarchicalConfigurationReader::parseLine(void)
{
    String *line;
    long idx;

    line = dynamic_cast<String *>(_stream->nextLine());
    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();
    return line;
}

void HierarchicalConfigurationReader::parseAssignment(String *line)
{
    String *path, *item, *value;
    Configuration *config;
    long idx = line->indexOf('=');

    path = dynamic_cast<String *>(line->copy(0, idx))->trimBlanks();
    if (path->isEmpty()) return;
    value = dynamic_cast<String *>(line->copy(idx + 1, line->size()))->trimBlanks();

    idx = path->lastIndexOf('.');
    if (idx < 0) {
        item = path;
        config = _configuration;
    } else {
        item = dynamic_cast<String *>(path->copy(idx + 1, path->size()));
        path = dynamic_cast<String *>(path->copy(0, idx));
        config = getConfigurationFor(path);
    }
    config->put(item, value);
}

void HierarchicalConfigurationReader::parseBlockOpenning(String *line)
{
    Configuration *subConfig = new Configuration;
    line = line->trimBlanks();
    if (line->isEmpty()) {
        error(new String("Configration parse error: block must have a name."),
              new String(__PRETTY_FUNCTION__), this);
    }
    put(line, subConfig);
    Configuration::instances()->put(line, subConfig);
    pushConfiguration();
    _configuration = subConfig;
}

void HierarchicalConfigurationReader::parseBlockClosing(String *line)
{
    popConfiguration();
}

/* Private protocol */
Configuration *HierarchicalConfigurationReader::getConfigurationFor(String *path)
{
    Configuration *config = _configuration;
    String *item;
    int index;

    do {
        index = path->indexOf('.');
        if (index < 0) item = path;
        else {
            item = dynamic_cast<String *>(path->copy(0, index));
            path = dynamic_cast<String *>(path->copy(index + 1, path->size()));
        }
        config = dynamic_cast<Configuration *>(config->at(item, nil));
        if (config == nil) {
            Configuration *subConfig = new Configuration;
            put(item, subConfig);
            Configuration::instances()->put(item, subConfig);
            config = subConfig;
        }
    } while (item != path);

    return config;
}

void HierarchicalConfigurationReader::pushConfiguration(void)
{
    stack->addFirst(_configuration);
}

void HierarchicalConfigurationReader::popConfiguration(void)
{
    _configuration = dynamic_cast<Configuration *>(stack->removeFirst());
}

};

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