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6abae35a39
In file included from json_spirit/json_spirit_writer.cpp:7:0:
json_spirit/json_spirit_writer_template.h: In function 'String_type json_spirit::non_printable_to_string(unsigned int)':
json_spirit/json_spirit_writer_template.h:37:50: warning: typedef 'Char_type' locally defined but not used [-Wunused-local-typedefs]
typedef typename String_type::value_type Char_type;
(Also, ha ha, this file uses \r\n.)
Signed-off-by: Sage Weil <sage@inktank.com>
384 lines
11 KiB
C++
384 lines
11 KiB
C++
#ifndef JSON_SPIRIT_WRITER_TEMPLATE
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#define JSON_SPIRIT_WRITER_TEMPLATE
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// Copyright John W. Wilkinson 2007 - 2011
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// Distributed under the MIT License, see accompanying file LICENSE.txt
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// json spirit version 4.05
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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#include "json_spirit_value.h"
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#include "json_spirit_writer_options.h"
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#include <cassert>
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#include <sstream>
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#include <iomanip>
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#include <boost/io/ios_state.hpp>
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namespace json_spirit
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{
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inline char to_hex_char( unsigned int c )
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{
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assert( c <= 0xF );
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const char ch = static_cast< char >( c );
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if( ch < 10 ) return '0' + ch;
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return 'A' - 10 + ch;
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}
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template< class String_type >
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String_type non_printable_to_string( unsigned int c )
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{
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String_type result( 6, '\\' );
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result[1] = 'u';
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result[ 5 ] = to_hex_char( c & 0x000F ); c >>= 4;
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result[ 4 ] = to_hex_char( c & 0x000F ); c >>= 4;
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result[ 3 ] = to_hex_char( c & 0x000F ); c >>= 4;
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result[ 2 ] = to_hex_char( c & 0x000F );
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return result;
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}
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template< typename Char_type, class String_type >
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bool add_esc_char( Char_type c, String_type& s )
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{
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switch( c )
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{
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case '"': s += to_str< String_type >( "\\\"" ); return true;
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case '\\': s += to_str< String_type >( "\\\\" ); return true;
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case '\b': s += to_str< String_type >( "\\b" ); return true;
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case '\f': s += to_str< String_type >( "\\f" ); return true;
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case '\n': s += to_str< String_type >( "\\n" ); return true;
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case '\r': s += to_str< String_type >( "\\r" ); return true;
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case '\t': s += to_str< String_type >( "\\t" ); return true;
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}
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return false;
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}
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template< class String_type >
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String_type add_esc_chars( const String_type& s, bool raw_utf8 )
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{
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typedef typename String_type::const_iterator Iter_type;
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typedef typename String_type::value_type Char_type;
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String_type result;
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const Iter_type end( s.end() );
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for( Iter_type i = s.begin(); i != end; ++i )
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{
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const Char_type c( *i );
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if( add_esc_char( c, result ) ) continue;
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if( raw_utf8 )
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{
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result += c;
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}
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else
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{
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const wint_t unsigned_c( ( c >= 0 ) ? c : 256 + c );
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if( iswprint( unsigned_c ) )
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{
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result += c;
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}
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else
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{
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result += non_printable_to_string< String_type >( unsigned_c );
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}
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}
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}
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return result;
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}
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template< class Ostream >
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void append_double( Ostream& os, const double d, const int precision )
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{
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os << std::showpoint << std::setprecision( precision ) << d;
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}
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template< class String_type >
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void erase_and_extract_exponent( String_type& str, String_type& exp )
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{
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const typename String_type::size_type exp_start= str.find( 'e' );
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if( exp_start != String_type::npos )
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{
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exp = str.substr( exp_start );
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str.erase( exp_start );
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}
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}
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template< class String_type >
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typename String_type::size_type find_first_non_zero( const String_type& str )
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{
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typename String_type::size_type result = str.size() - 1;
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for( ; result != 0; --result )
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{
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if( str[ result ] != '0' )
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{
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break;
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}
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}
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return result;
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}
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template< class String_type >
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void remove_trailing( String_type& str )
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{
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String_type exp;
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erase_and_extract_exponent( str, exp );
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const typename String_type::size_type first_non_zero = find_first_non_zero( str );
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if( first_non_zero != 0 )
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{
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const int offset = str[first_non_zero] == '.' ? 2 : 1; // note zero digits following a decimal point is non standard
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str.erase( first_non_zero + offset );
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}
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str += exp;
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}
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// this class generates the JSON text,
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// it keeps track of the indentation level etc.
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//
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template< class Value_type, class Ostream_type >
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class Generator
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{
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typedef typename Value_type::Config_type Config_type;
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typedef typename Config_type::String_type String_type;
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typedef typename Config_type::Object_type Object_type;
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typedef typename Config_type::Array_type Array_type;
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typedef typename String_type::value_type Char_type;
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typedef typename Object_type::value_type Obj_member_type;
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public:
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Generator( const Value_type& value, Ostream_type& os, unsigned int options )
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: os_( os )
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, indentation_level_( 0 )
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, pretty_( ( options & pretty_print ) != 0 || ( options & single_line_arrays ) != 0 )
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, raw_utf8_( ( options & raw_utf8 ) != 0 )
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, remove_trailing_zeros_( ( options & remove_trailing_zeros ) != 0 )
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, single_line_arrays_( ( options & single_line_arrays ) != 0 )
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, ios_saver_( os )
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{
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output( value );
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}
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private:
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void output( const Value_type& value )
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{
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switch( value.type() )
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{
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case obj_type: output( value.get_obj() ); break;
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case array_type: output( value.get_array() ); break;
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case str_type: output( value.get_str() ); break;
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case bool_type: output( value.get_bool() ); break;
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case real_type: output( value.get_real() ); break;
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case int_type: output_int( value ); break;
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case null_type: os_ << "null"; break;
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default: assert( false );
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}
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}
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void output( const Object_type& obj )
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{
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output_array_or_obj( obj, '{', '}' );
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}
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void output( const Obj_member_type& member )
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{
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output( Config_type::get_name( member ) ); space();
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os_ << ':'; space();
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output( Config_type::get_value( member ) );
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}
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void output_int( const Value_type& value )
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{
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if( value.is_uint64() )
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{
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os_ << value.get_uint64();
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}
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else
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{
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os_ << value.get_int64();
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}
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}
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void output( const String_type& s )
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{
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os_ << '"' << add_esc_chars( s, raw_utf8_ ) << '"';
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}
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void output( bool b )
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{
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os_ << to_str< String_type >( b ? "true" : "false" );
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}
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void output( double d )
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{
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if( remove_trailing_zeros_ )
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{
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std::basic_ostringstream< Char_type > os;
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append_double( os, d, 16 ); // note precision is 16 so that we get some trailing space that we can remove,
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// otherwise, 0.1234 gets converted to "0.12399999..."
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String_type str = os.str();
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remove_trailing( str );
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os_ << str;
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}
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else
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{
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append_double( os_, d, 17 );
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}
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}
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static bool contains_composite_elements( const Array_type& arr )
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{
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for( typename Array_type::const_iterator i = arr.begin(); i != arr.end(); ++i )
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{
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const Value_type& val = *i;
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if( val.type() == obj_type ||
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val.type() == array_type )
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{
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return true;
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}
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}
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return false;
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}
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template< class Iter >
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void output_composite_item( Iter i, Iter last )
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{
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output( *i );
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if( ++i != last )
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{
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os_ << ',';
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}
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}
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void output( const Array_type& arr )
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{
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if( single_line_arrays_ && !contains_composite_elements( arr ) )
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{
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os_ << '['; space();
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for( typename Array_type::const_iterator i = arr.begin(); i != arr.end(); ++i )
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{
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output_composite_item( i, arr.end() );
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space();
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}
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os_ << ']';
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}
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else
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{
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output_array_or_obj( arr, '[', ']' );
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}
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}
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template< class T >
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void output_array_or_obj( const T& t, Char_type start_char, Char_type end_char )
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{
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os_ << start_char; new_line();
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++indentation_level_;
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for( typename T::const_iterator i = t.begin(); i != t.end(); ++i )
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{
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indent();
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output_composite_item( i, t.end() );
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new_line();
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}
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--indentation_level_;
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indent(); os_ << end_char;
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}
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void indent()
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{
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if( !pretty_ ) return;
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for( int i = 0; i < indentation_level_; ++i )
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{
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os_ << " ";
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}
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}
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void space()
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{
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if( pretty_ ) os_ << ' ';
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}
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void new_line()
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{
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if( pretty_ ) os_ << '\n';
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}
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Generator& operator=( const Generator& ); // to prevent "assignment operator could not be generated" warning
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Ostream_type& os_;
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int indentation_level_;
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bool pretty_;
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bool raw_utf8_;
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bool remove_trailing_zeros_;
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bool single_line_arrays_;
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boost::io::basic_ios_all_saver< Char_type > ios_saver_; // so that ostream state is reset after control is returned to the caller
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};
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// writes JSON Value to a stream, e.g.
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//
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// write_stream( value, os, pretty_print );
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//
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template< class Value_type, class Ostream_type >
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void write_stream( const Value_type& value, Ostream_type& os, unsigned int options = 0 )
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{
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os << std::dec;
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Generator< Value_type, Ostream_type >( value, os, options );
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}
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// writes JSON Value to a stream, e.g.
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//
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// const string json_str = write( value, pretty_print );
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//
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template< class Value_type >
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typename Value_type::String_type write_string( const Value_type& value, unsigned int options = 0 )
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{
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typedef typename Value_type::String_type::value_type Char_type;
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std::basic_ostringstream< Char_type > os;
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write_stream( value, os, options );
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return os.str();
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}
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}
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#endif
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