assimp/contrib/openddlparser/README.md

The OpenDDL-Parser
==================

The OpenDDL-Parser is a small and easy to use library for OpenDDL-file-format-parsing. OpenDDL is the shortcut for Open Data Description Language, a data-declaration language introduced by Eric Lengyel. Please check http://openddl.org/ if you want to learn more about it.

Build status
============
Linux build status: [![Build Status](https://travis-ci.org/kimkulling/openddl-parser.png)](https://travis-ci.org/kimkulling/openddl-parser)
Current coverity check status:
<a href="https://scan.coverity.com/projects/5606">
  <img alt="Coverity Scan Build Status"
       src="https://scan.coverity.com/projects/5606/badge.svg"/>
</a>

Get the source code
===================
You can get the code from our git repository, which is located at GitHub. You can clone the repository with the following command:

> git clone https://github.com/kimkulling/openddl-parser.git

Building the source from the GitHub-Repo
========================================
To build the library you need to install cmake first ( see http://www.cmake.org/ for more information ). Make also sure that a compiler tool-chain is installed on your machine.
After installing it you can open a console and enter:

> cmake CMakeLists.txt

This command will generate a build environment for your installed build enrironment ( for Visual-Studio-users the project files will be generated, for gcc-users the makefiles will be generated ).
When using an IDE open the IDE and run the build. When using GNU-make type in your console:

> make

and that's all.

When using Visual Studio CMake will generate you a solution for ythe library. Just build it there.

Use the library
===============
To use the OpenDDL-parser you need to build the lib first. Now add the 
> <Repo-folder>/include 

to your include-path and the 

> <Repo-folder>/lib

to your lib-folder. Link the openddl.lib to your application. 

Here is a small example how to use the lib:

```cpp

#include <iostream>
#include <cassert>
#include <openddlparser/OpenDDLParser.h>

USE_ODDLPARSER_NS;

int main( int argc, char *argv[] ) {
    if( argc < 3 ) {
        return 1;
    }

    char *filename( nullptr );
    if( 0 == strncmp( FileOption, argv[ 1 ], strlen( FileOption ) ) ) {
        filename = argv[ 2 ];
    }
    std::cout << "file to import: " << filename << std::endl;   
    if( nullptr == filename ) {
        std::cerr << "Invalid filename." << std::endl;
        return Error;
    }

    FILE *fileStream = fopen( filename, "r+" );
    if( NULL == filename ) {
        std::cerr << "Cannot open file " << filename << std::endl;
        return 1;
    }

    // obtain file size:
    fseek( fileStream, 0, SEEK_END );
    const size_t size( ftell( fileStream ) );   
    rewind( fileStream );   
    if( size > 0 ) {
        char *buffer = new char[ size ];
        const size_t readSize( fread( buffer, sizeof( char ), size, fileStream ) );
        assert( readSize == size );
        OpenDDLParser theParser;
        theParser.setBuffer( buffer, size );
        const bool result( theParser.parse() );
        if( !result ) {
            std::cerr << "Error while parsing file " << filename << "." << std::endl;
        }
    }
    return 0;
}

```

How to access the imported data
===============================
The data is organized as a tree. You can get the root-node of the tree with the following code:

```cpp
OpenDDLParser theParser;
theParser.setBuffer( buffer, size );
const bool result( theParser.parse() );
if ( result ) {
    DDLNode *root = theParser.getRoot();
    DDLNode::DllNodeList childs = root->getChildNodeList();
    for ( size_t i=0; i<childs.size(); i++ ) {
        DDLNode *child = childs[ i ];
        Property *prop   = child->getProperty(); // to get properties
        std::string type = child->getType();     // to get the node type
        Value *values    = child->getValue();    // to get the data;
        
        // to loop through all values
        while ( values != ddl_nullptr ) {
            int current = values->getInt32();
            values = value->getNext();
        }
    }
}

```

The node instance called root contains the data.

All data lists are organized as linked lists.

Reference documentation
=======================
Please check http://kimkulling.github.io/openddl-parser/doxygen_html/index.html.

Projects using OpenDDL-Parser
=============================
- Asset Importer Lib: https://github.com/assimp/assimp .