doc/jsoncpp.dox

/**
\mainpage
\section _intro Introduction

<a HREF="http://www.json.org/">JSON (JavaScript Object Notation)</a>
 is a lightweight data-interchange format. 

Here is an example of JSON data:
\verbatim
{
    "encoding" : "UTF-8",
    "plug-ins" : [
        "python",
        "c++",
        "ruby"
        ],
    "indent" : { "length" : 3, "use_space": true }
}
\endverbatim
<b>JsonCpp</b> supports comments as <i>meta-data</i>:
\code
// Configuration options
{
    // Default encoding for text
    "encoding" : "UTF-8",
    
    // Plug-ins loaded at start-up
    "plug-ins" : [
        "python",
        "c++",  // trailing comment
        "ruby"
        ],
        
    // Tab indent size
    // (multi-line comment)
    "indent" : { /*embedded comment*/ "length" : 3, "use_space": true }
}
\endcode

\section _features Features
- read and write JSON document
- attach C++ style comments to element during parsing
- rewrite JSON document preserving original comments

Notes: Comments used to be supported in JSON but were removed for
portability (C like comments are not supported in Python). Since
comments are useful in configuration/input file, this feature was
preserved.

\section _example Code example

\code
Json::Value root;   // will contain the root value after parsing.
Json::Reader reader;
bool parsingSuccessful = reader.parse( config_doc, root );
if ( !parsingSuccessful )
{
    // report to the user the failure and their locations in the document.
    std::cout  << "Failed to parse configuration\n"
               << reader.getFormattedErrorMessages();
    return;
}

// Get the value of the member of root named 'encoding', return 'UTF-8' if there is no
// such member.
std::string encoding = root.get("encoding", "UTF-8" ).asString();
// Get the value of the member of root named 'encoding', return a 'null' value if
// there is no such member.
const Json::Value plugins = root["plug-ins"];
for ( int index = 0; index < plugins.size(); ++index )  // Iterates over the sequence elements.
   loadPlugIn( plugins[index].asString() );
   
setIndentLength( root["indent"].get("length", 3).asInt() );
setIndentUseSpace( root["indent"].get("use_space", true).asBool() );

// Since Json::Value has implicit constructor for all value types, it is not
// necessary to explicitly construct the Json::Value object:
root["encoding"] = getCurrentEncoding();
root["indent"]["length"] = getCurrentIndentLength();
root["indent"]["use_space"] = getCurrentIndentUseSpace();

// To write into a steam with minimal memory overhead,
// create a Builder for a StreamWriter.
Json::StreamWriterBuilder builder;
builder.indentation_ = "   ";  // or whatever you like

// Then build a StreamWriter.
std::shared_ptr<Json::StreamWriter> writer(
    builder.newStreamWriter( &std::cout ) );

// Make a new JSON document for the configuration. Preserve original comments.
writer->write( root );

// If you like the defaults, you can insert directly into a stream.
std::cout << root;

// If desired, remember to add a linefeed and flush.
std::cout << std::endl;

// Of course, you can write to `std::ostringstream` if you prefer. Or
// use `writeString()` for convenience.
std::string document = Json::writeString( root, builder );

// You can also read from a stream.  This will put the contents of any JSON
// stream at a particular sub-value, if you'd like.
std::cin >> root["subtree"];
\endcode

\section _pbuild Build instructions
The build instructions are located in the file 
<a HREF="https://github.com/open-source-parsers/jsoncpp/blob/master/README.md">README.md</a> in the top-directory of the project.

The latest version of the source is available in the project's GitHub repository:
<a HREF="https://github.com/open-source-parsers/jsoncpp/">
jsoncpp</a>

\section _news What's New?
The description of latest changes can be found in 
<a HREF="https://github.com/open-source-parsers/jsoncpp/wiki/NEWS">
  the NEWS wiki
</a>.

\section _rlinks Related links
- <a HREF="http://www.json.org/">JSON</a> Specification and alternate language implementations.
- <a HREF="http://www.yaml.org/">YAML</a> A data format designed for human readability.
- <a HREF="http://www.cl.cam.ac.uk/~mgk25/unicode.html">UTF-8 and Unicode FAQ</a>.

\section _plinks Old project links
- <a href="https://sourceforge.net/projects/jsoncpp/">https://sourceforge.net/projects/jsoncpp/</a>
- <a href="http://jsoncpp.sourceforge.net">http://jsoncpp.sourceforge.net</a>
- <a href="http://sourceforge.net/projects/jsoncpp/files/">http://sourceforge.net/projects/jsoncpp/files/</a>
- <a href="http://jsoncpp.svn.sourceforge.net/svnroot/jsoncpp/trunk/">http://jsoncpp.svn.sourceforge.net/svnroot/jsoncpp/trunk/</a>
- <a href="http://jsoncpp.sourceforge.net/old.html">http://jsoncpp.sourceforge.net/old.html</a>

\section _license License
See file <a href="https://github.com/open-source-parsers/jsoncpp/blob/master/LICENSE"><code>LICENSE</code></a> in the top-directory of the project.

Basically JsonCpp is licensed under MIT license, or public domain if desired 
and recognized in your jurisdiction.

\author Baptiste Lepilleur <blep@users.sourceforge.net> (originator)
*/