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/* Copyright (c) 2007 John W Wilkinson
This source code can be used for any purpose as long as
this comment is retained. */
// json spirit version 2.01
#include "json_spirit_writer.h"
#include "json_spirit_value.h"
#include <cassert>
#include <sstream>
#include <iomanip>
using namespace json_spirit;
using namespace std;
namespace
{
// this class solely allows its inner classes and methods to
// be conveniently templatised by Value type and dependent types
//
template< class Value_t >
struct Writer
{
typedef typename Value_t::String_type String_t;
typedef typename Value_t::Object Object_t;
typedef typename Value_t::Array Array_t;
typedef typename String_t::value_type Char_t;
typedef typename String_t::const_iterator Iter_t;
typedef Pair_impl< String_t > Pair_t;
typedef std::basic_ostream< Char_t > Ostream_t;
// this class generates the JSON text,
// it keeps track of the indentation level etc.
//
class Generator
{
public:
Generator( const Value_t& value, Ostream_t& os, bool pretty )
: os_( os )
, indentation_level_( 0 )
, pretty_( pretty )
{
output( value );
}
private:
void output( const Value_t& value )
{
switch( value.type() )
{
case obj_type: output( value.get_obj() ); break;
case array_type: output( value.get_array() ); break;
case str_type: output( value.get_str() ); break;
case bool_type: output( value.get_bool() ); break;
case int_type: os_ << value.get_int(); break;
case real_type: os_ << showpoint << setprecision( 16 )
<< value.get_real(); break;
case null_type: os_ << "null"; break;
default: assert( false );
}
}
void output( const Object_t& obj )
{
output_array_or_obj( obj, '{', '}' );
}
void output( const Array_t& arr )
{
output_array_or_obj( arr, '[', ']' );
}
void output( const Pair_t& pair )
{
output( pair.name_ ); space(); os_ << ':'; space(); output( pair.value_ );
}
void output( const String_t& s )
{
os_ << '"' << add_esc_chars( s ) << '"';
}
void output( bool b )
{
os_ << to_str( b ? "true" : "false" );
}
template< class T >
void output_array_or_obj( const T& t, Char_t start_char, Char_t end_char )
{
os_ << start_char; new_line();
++indentation_level_;
for( typename T::const_iterator i = t.begin(); i != t.end(); ++i )
{
indent(); output( *i );
if( i != t.end() - 1 )
{
os_ << ',';
}
new_line();
}
--indentation_level_;
indent(); os_ << end_char;
}
void indent()
{
if( !pretty_ ) return;
for( int i = 0; i < indentation_level_; ++i )
{
os_ << " ";
}
}
void space()
{
if( pretty_ ) os_ << ' ';
}
void new_line()
{
if( pretty_ ) os_ << '\n';
}
String_t to_str( const char* c_str )
{
return ::to_str< String_t >( c_str );
}
Char_t to_hex( Char_t c )
{
assert( c <= 0xF );
if( c < 10 ) return '0' + c;
return 'A' + c - 10;
}
String_t non_printable_to_string( Char_t c )
{
String_t result( to_str( "\\u" ) );
result.resize( 6, '0' );
for( int i = 0; i < 4; ++i )
{
result[ 5 - i ] = to_hex( c % 16 );
c >>= 4;
}
return result;
}
bool add_esc_char( Char_t c, String_t& s )
{
switch( c )
{
case '"': s += to_str( "\\\"" ); return true;
case '\\': s += to_str( "\\\\" ); return true;
case '\b': s += to_str( "\\b" ); return true;
case '\f': s += to_str( "\\f" ); return true;
case '\n': s += to_str( "\\n" ); return true;
case '\r': s += to_str( "\\r" ); return true;
case '\t': s += to_str( "\\t" ); return true;
}
return false;
}
String_t add_esc_chars( const String_t& s )
{
String_t result;
const Iter_t end( s.end() );
for( Iter_t i = s.begin(); i != end; ++i )
{
const Char_t c( *i );
if( add_esc_char( c, result ) ) continue;
if( iswprint( c ) )
{
result += c;
}
else
{
result += non_printable_to_string( c );
}
}
return result;
}
Ostream_t& os_;
int indentation_level_;
bool pretty_;
};
static void write( const Value_t& value, Ostream_t& os, bool pretty )
{
Generator( value, os, pretty );
}
static String_t write( const Value_t& value, bool pretty )
{
basic_ostringstream< Char_t > os;
write( value, os, pretty );
return os.str();
}
};
}
void json_spirit::write( const Value& value, std::ostream& os )
{
Writer< Value >::write( value, os, false );
}
void json_spirit::write_formatted( const Value& value, std::ostream& os )
{
Writer< Value >::write( value, os, true );
}
std::string json_spirit::write( const Value& value )
{
return Writer< Value >::write( value, false );
}
std::string json_spirit::write_formatted( const Value& value )
{
return Writer< Value >::write( value, true );
}
#ifndef BOOST_NO_STD_WSTRING
void json_spirit::write( const wValue& value, std::wostream& os )
{
Writer< wValue >::write( value, os, false );
}
void json_spirit::write_formatted( const wValue& value, std::wostream& os )
{
Writer< wValue >::write( value, os, true );
}
std::wstring json_spirit::write( const wValue& value )
{
return Writer< wValue >::write( value, false );
}
std::wstring json_spirit::write_formatted( const wValue& value )
{
return Writer< wValue >::write( value, true );
}
#endif
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