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/*
FALCON - The Falcon Programming Language
FILE: json_ext.cpp
JSON transport format interface - extension implementation.
-------------------------------------------------------------------
Author: Giancarlo Niccolai
Begin: Sun, 27 Sep 2009 18:28:44 +0200
-------------------------------------------------------------------
(C) Copyright 2004: the FALCON developers (see list in AUTHORS file)
See LICENSE file for licensing details.
*/
/** \file
Funcext module main file - extension implementation.
*/
#include <falcon/setup.h>
#include <falcon/module.h>
#include <falcon/vm.h>
#include <falcon/stream.h>
#include <falcon/stringstream.h>
#include <falcon/rosstream.h>
#include "json_ext.h"
#include "json_mod.h"
#include "json_st.h"
/*#
@beginmodule feathers.json
*/
namespace Falcon {
namespace Ext {
/*#
@function JSONencode
@brief Encode an item in JSON format.
@param item the item to be encoded in JSON format.
@optparam stream A stream on which to send the encoded result.
@optparam pretty Add spacing around separators and puntaction.
@optparam readable Put each item in lists on a separate line.
@return a string containing the JSON string, if @b stream is nil
@raise JSONError if the passed item cannot be turned into a JSON representation.
@raise IoError in case of error on target stream.
*/
FALCON_FUNC JSONencode ( ::Falcon::VMachine *vm )
{
Item *i_item = vm->param(0);
Item *i_stream = vm->param(1);
Item *i_pretty = vm->param(2);
Item *i_readable = vm->param(3);
Stream* target = 0;
bool bDel;
if ( i_item == 0 ||
(i_stream != 0 && ! i_stream->isNil() && ! i_stream->isOfClass( "Stream" ))
)
{
throw new ParamError( ErrorParam( e_inv_params, __LINE__ ).
origin( e_orig_runtime ).
extra("X, [Stream]") );
}
if ( i_stream == 0 || i_stream->isNil() )
{
bDel = true;
target = new StringStream;
}
else {
bDel = false;
target = dyncast<Stream*>( i_stream->asObject()->getFalconData() );
}
bool bPretty = i_pretty != 0 && i_pretty->isTrue();
bool bReadable = i_readable != 0 && i_readable->isTrue();
JSON encoder( bPretty, bReadable );
bool result = encoder.encode( *i_item, target );
if( bDel )
{
vm->retval( static_cast<StringStream*>(target)->closeToString() );
delete target;
}
else
{
if( ! target->good() )
{
throw new IoError( ErrorParam( e_io_error, __LINE__ ).
origin( e_orig_runtime ).
sysError( target->lastError() ) );
}
}
if ( ! result )
{
throw new JSONError( ErrorParam( FALCON_JSON_NOT_CODEABLE, __LINE__ )
.origin( e_orig_runtime )
.desc( FAL_STR(json_msg_non_codeable) ) );
}
}
/*#
@function JSONdecode
@brief Decode an item stored in JSON format.
@param source A string or a stream from which to read the JSON data.
@return a string containing the JSON string, if @b stream is nil
@raise JSONError if the input data cannot be parsed.
@raise IoError in case of error on the source stream.
*/
FALCON_FUNC JSONdecode ( ::Falcon::VMachine *vm )
{
Item *i_source = vm->param(0);
Stream* target = 0;
bool bDel;
if ( i_source == 0 || ! (i_source->isString() || i_source->isOfClass( "Stream" ))
)
{
throw new ParamError( ErrorParam( e_inv_params, __LINE__ ).
origin( e_orig_runtime ).
extra("S|Stream") );
}
if ( i_source->isString() )
{
bDel = true;
target = new ROStringStream(*i_source->asString());
}
else {
bDel = false;
target = dyncast<Stream*>( i_source->asObject()->getFalconData() );
}
Item item;
JSON encoder;
bool result = encoder.decode( item, target );
// ok also in case of error -- actually better, as it clears garbage
vm->retval( item );
if( bDel )
{
delete target;
}
else if( ! target->good() && ! target->eof() )
{
throw new IoError( ErrorParam( e_io_error, __LINE__ ).
origin( e_orig_runtime ).
sysError( target->lastError() ) );
}
if ( ! result )
{
throw new JSONError( ErrorParam( FALCON_JSON_NOT_DECODABLE, __LINE__ )
.origin( e_orig_runtime )
.desc( FAL_STR(json_msg_non_decodable) ) );
}
}
//=====================================================
// JSON Error
//
/*#
@class JSONError
@brief Error generated after error conditions on JSON operations.
@optparam code The error code
@optparam desc The description for the error code
@optparam extra Extra information specifying the error conditions.
@from Error( code, desc, extra )
*/
FALCON_FUNC JSONError_init ( ::Falcon::VMachine *vm )
{
CoreObject *einst = vm->self().asObject();
if( einst->getUserData() == 0 )
einst->setUserData( new JSONError );
::Falcon::core::Error_init( vm );
}
}
}
/* end of funcext_ext.cpp */
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