Initial revision

[lsystem3d.git] / lsystem3d / src / xmlstructure.cpp

// Copyright (C) 2006 Erik Dahlberg
// 
// This file is part of LSystem3d.
// 
// LSystem3D is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
// 
// LSystem3D 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 General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with LSystem3D; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA




#include <string>

#include <libxml++/document.h>
#include <libxml++/nodes/element.h>
#include <libxml++/nodes/node.h>
#include <libxml++/parsers/domparser.h>

#include <glibmm/stringutils.h>

#include "xmlstructure.h"

using namespace std;



/**
 * Constructor
 */
XMLStructure::XMLStructure()
{
    _rootElement = NULL;
    _activeElement = NULL;
    _activeDocument = NULL;
    _activeChildInList = NULL;
}



/**
 * Destructor
 */
XMLStructure::~XMLStructure()
{
    delete _activeDocument;
}



/**
 * Create new document with root node
 * @param rootName name of root
 */
void XMLStructure::createDocumentWithRoot(string rootName)
{
    delete _activeDocument;
    _activeDocument = new xmlpp::Document;
    
    _rootElement = _activeDocument->create_root_node(rootName);
}



/**
 * Add new child to root
 * @param name name of child
 */
void XMLStructure::addChildToRoot(string name)
{
    _activeElement = _rootElement->add_child(name);
}



/**
 * Add a string as content of current child
 * @param text the text
 */
void XMLStructure::addString(string text)
{
    _activeElement->add_child_text(text);
}



/**
 * Add a number as content of current child
 * @param value the number
 */
void XMLStructure::addNumber(double value)
{
    // convert double -> string
    string numberAsString = Glib::Ascii::dtostr(value);
    
    addString(numberAsString);
}



/**
 * Add attribute to current child
 * @param name name of attribute
 * @param value value of attribute
 */
void XMLStructure::addAttribute(string name, string value)
{
    _activeElement->set_attribute(name, value);
}



/**
 * Save document to file
 * @param path path to file
 */
void XMLStructure::saveToDisk(string path)
{
    _activeDocument->write_to_file_formatted(path);
}



/**
 * Load document from file
 * @param path path to file
 */
void XMLStructure::loadFromDisk(string path)
{
    // TODO: validate?
    //_parser.set_validate(true);
    
    _parser.parse_file(path);
        
    _rootElement = _parser.get_document()->get_root_node();
}



/**
 * Find all children with the specified name
 * @param name name of children
 * @return true if found, else false
 */
bool XMLStructure::findChild(string name)
{
    _activeList = _rootElement->get_children(name);
    _activeChildInList = _activeList.begin();
    
    return !_activeList.empty();
}



/**
 * Find next child in current search result list
 * @return true if found, else false
 */
bool XMLStructure::findNextChild()
{
    _activeChildInList++;
    
    bool endOfList = false;
    
    // last child?
    if (_activeChildInList == _activeList.end())
    {
        _activeChildInList--;
        endOfList = true;
    }
    
    return !endOfList;
}



/**
 * Get content of current child as a string
 * @return the string
 */
string XMLStructure::getString()
{
    // the child
    xmlpp::Node *child = (*_activeChildInList)->get_children().front();
    
    // its content
    string content = dynamic_cast<xmlpp::ContentNode*>(child)->get_content();
    
    return content;
}



/**
 * Get content of current child as a number
 * @return the number
 */
double XMLStructure::getNumber()
{
    // convert string -> double
    double number = Glib::Ascii::strtod(getString());

    return number;
}



/**
 * Get attribute value of current child
 * @param name name of attribute
 * @return the value
 */
string XMLStructure::getAttribute(string name)
{
    // the child
    xmlpp::Element *child = dynamic_cast<xmlpp::Element*>(*_activeChildInList);
    
    // its attribute value
    string attributeValue = child->get_attribute(name)->get_value();
    
    return attributeValue;
}