612 lines
19 KiB
C++
612 lines
19 KiB
C++
#ifndef JSON_SPIRIT_READER_TEMPLATE
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#define JSON_SPIRIT_READER_TEMPLATE
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// Copyright John W. Wilkinson 2007 - 2009.
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// Distributed under the MIT License, see accompanying file LICENSE.txt
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// json spirit version 4.03
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#include "json_spirit_value.h"
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#include "json_spirit_error_position.h"
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//#define BOOST_SPIRIT_THREADSAFE // uncomment for multithreaded use, requires linking to boost.thread
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#include <boost/bind.hpp>
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#include <boost/function.hpp>
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#include <boost/version.hpp>
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#if BOOST_VERSION >= 103800
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#include <boost/spirit/include/classic_core.hpp>
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#include <boost/spirit/include/classic_confix.hpp>
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#include <boost/spirit/include/classic_escape_char.hpp>
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#include <boost/spirit/include/classic_multi_pass.hpp>
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#include <boost/spirit/include/classic_position_iterator.hpp>
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#define spirit_namespace boost::spirit::classic
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#else
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#include <boost/spirit/core.hpp>
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#include <boost/spirit/utility/confix.hpp>
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#include <boost/spirit/utility/escape_char.hpp>
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#include <boost/spirit/iterator/multi_pass.hpp>
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#include <boost/spirit/iterator/position_iterator.hpp>
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#define spirit_namespace boost::spirit
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#endif
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namespace json_spirit
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{
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const spirit_namespace::int_parser < boost::int64_t > int64_p = spirit_namespace::int_parser < boost::int64_t >();
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const spirit_namespace::uint_parser< boost::uint64_t > uint64_p = spirit_namespace::uint_parser< boost::uint64_t >();
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template< class Iter_type >
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bool is_eq( Iter_type first, Iter_type last, const char* c_str )
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{
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for( Iter_type i = first; i != last; ++i, ++c_str )
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{
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if( *c_str == 0 ) return false;
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if( *i != *c_str ) return false;
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}
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return true;
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}
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template< class Char_type >
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Char_type hex_to_num( const Char_type c )
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{
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if( ( c >= '0' ) && ( c <= '9' ) ) return c - '0';
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if( ( c >= 'a' ) && ( c <= 'f' ) ) return c - 'a' + 10;
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if( ( c >= 'A' ) && ( c <= 'F' ) ) return c - 'A' + 10;
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return 0;
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}
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template< class Char_type, class Iter_type >
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Char_type hex_str_to_char( Iter_type& begin )
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{
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const Char_type c1( *( ++begin ) );
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const Char_type c2( *( ++begin ) );
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return ( hex_to_num( c1 ) << 4 ) + hex_to_num( c2 );
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}
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template< class Char_type, class Iter_type >
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Char_type unicode_str_to_char( Iter_type& begin )
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{
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const Char_type c1( *( ++begin ) );
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const Char_type c2( *( ++begin ) );
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const Char_type c3( *( ++begin ) );
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const Char_type c4( *( ++begin ) );
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return ( hex_to_num( c1 ) << 12 ) +
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( hex_to_num( c2 ) << 8 ) +
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( hex_to_num( c3 ) << 4 ) +
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hex_to_num( c4 );
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}
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template< class String_type >
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void append_esc_char_and_incr_iter( String_type& s,
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typename String_type::const_iterator& begin,
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typename String_type::const_iterator end )
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{
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typedef typename String_type::value_type Char_type;
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const Char_type c2( *begin );
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switch( c2 )
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{
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case 't': s += '\t'; break;
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case 'b': s += '\b'; break;
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case 'f': s += '\f'; break;
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case 'n': s += '\n'; break;
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case 'r': s += '\r'; break;
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case '\\': s += '\\'; break;
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case '/': s += '/'; break;
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case '"': s += '"'; break;
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case 'x':
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{
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if( end - begin >= 3 ) // expecting "xHH..."
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{
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s += hex_str_to_char< Char_type >( begin );
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}
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break;
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}
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case 'u':
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{
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if( end - begin >= 5 ) // expecting "uHHHH..."
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{
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s += unicode_str_to_char< Char_type >( begin );
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}
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break;
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}
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}
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}
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template< class String_type >
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String_type substitute_esc_chars( typename String_type::const_iterator begin,
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typename String_type::const_iterator end )
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{
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typedef typename String_type::const_iterator Iter_type;
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if( end - begin < 2 ) return String_type( begin, end );
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String_type result;
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result.reserve( end - begin );
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const Iter_type end_minus_1( end - 1 );
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Iter_type substr_start = begin;
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Iter_type i = begin;
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for( ; i < end_minus_1; ++i )
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{
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if( *i == '\\' )
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{
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result.append( substr_start, i );
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++i; // skip the '\'
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append_esc_char_and_incr_iter( result, i, end );
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substr_start = i + 1;
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}
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}
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result.append( substr_start, end );
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return result;
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}
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template< class String_type >
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String_type get_str_( typename String_type::const_iterator begin,
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typename String_type::const_iterator end )
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{
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assert( end - begin >= 2 );
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typedef typename String_type::const_iterator Iter_type;
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Iter_type str_without_quotes( ++begin );
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Iter_type end_without_quotes( --end );
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return substitute_esc_chars< String_type >( str_without_quotes, end_without_quotes );
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}
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inline std::string get_str( std::string::const_iterator begin, std::string::const_iterator end )
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{
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return get_str_< std::string >( begin, end );
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}
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inline std::wstring get_str( std::wstring::const_iterator begin, std::wstring::const_iterator end )
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{
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return get_str_< std::wstring >( begin, end );
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}
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template< class String_type, class Iter_type >
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String_type get_str( Iter_type begin, Iter_type end )
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{
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const String_type tmp( begin, end ); // convert multipass iterators to string iterators
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return get_str( tmp.begin(), tmp.end() );
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}
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// this class's methods get called by the spirit parse resulting
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// in the creation of a JSON object or array
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//
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// NB Iter_type could be a std::string iterator, wstring iterator, a position iterator or a multipass iterator
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//
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template< class Value_type, class Iter_type >
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class Semantic_actions
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{
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public:
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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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Semantic_actions( Value_type& value )
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: value_( value )
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, current_p_( 0 )
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{
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}
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void begin_obj( Char_type c )
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{
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assert( c == '{' );
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begin_compound< Object_type >();
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}
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void end_obj( Char_type c )
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{
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assert( c == '}' );
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end_compound();
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}
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void begin_array( Char_type c )
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{
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assert( c == '[' );
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begin_compound< Array_type >();
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}
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void end_array( Char_type c )
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{
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assert( c == ']' );
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end_compound();
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}
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void new_name( Iter_type begin, Iter_type end )
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{
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assert( current_p_->type() == obj_type );
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name_ = get_str< String_type >( begin, end );
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}
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void new_str( Iter_type begin, Iter_type end )
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{
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add_to_current( get_str< String_type >( begin, end ) );
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}
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void new_true( Iter_type begin, Iter_type end )
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{
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assert( is_eq( begin, end, "true" ) );
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add_to_current( true );
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}
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void new_false( Iter_type begin, Iter_type end )
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{
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assert( is_eq( begin, end, "false" ) );
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add_to_current( false );
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}
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void new_null( Iter_type begin, Iter_type end )
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{
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assert( is_eq( begin, end, "null" ) );
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add_to_current( Value_type() );
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}
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void new_int( boost::int64_t i )
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{
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add_to_current( i );
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}
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void new_uint64( boost::uint64_t ui )
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{
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add_to_current( ui );
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}
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void new_real( double d )
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{
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add_to_current( d );
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}
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private:
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Semantic_actions& operator=( const Semantic_actions& );
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// to prevent "assignment operator could not be generated" warning
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Value_type* add_first( const Value_type& value )
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{
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assert( current_p_ == 0 );
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value_ = value;
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current_p_ = &value_;
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return current_p_;
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}
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template< class Array_or_obj >
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void begin_compound()
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{
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if( current_p_ == 0 )
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{
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add_first( Array_or_obj() );
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}
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else
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{
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stack_.push_back( current_p_ );
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Array_or_obj new_array_or_obj; // avoid copy by building new array or object in place
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current_p_ = add_to_current( new_array_or_obj );
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}
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}
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void end_compound()
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{
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if( current_p_ != &value_ )
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{
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current_p_ = stack_.back();
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stack_.pop_back();
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}
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}
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Value_type* add_to_current( const Value_type& value )
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{
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if( current_p_ == 0 )
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{
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return add_first( value );
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}
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else if( current_p_->type() == array_type )
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{
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current_p_->get_array().push_back( value );
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return ¤t_p_->get_array().back();
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}
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assert( current_p_->type() == obj_type );
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return &Config_type::add( current_p_->get_obj(), name_, value );
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}
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Value_type& value_; // this is the object or array that is being created
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Value_type* current_p_; // the child object or array that is currently being constructed
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std::vector< Value_type* > stack_; // previous child objects and arrays
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String_type name_; // of current name/value pair
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};
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template< typename Iter_type >
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void throw_error( spirit_namespace::position_iterator< Iter_type > i, const std::string& reason )
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{
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throw Error_position( i.get_position().line, i.get_position().column, reason );
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}
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template< typename Iter_type >
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void throw_error( Iter_type i, const std::string& reason )
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{
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throw reason;
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}
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// the spirit grammer
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//
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template< class Value_type, class Iter_type >
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class Json_grammer : public spirit_namespace::grammar< Json_grammer< Value_type, Iter_type > >
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{
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public:
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typedef Semantic_actions< Value_type, Iter_type > Semantic_actions_t;
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Json_grammer( Semantic_actions_t& semantic_actions )
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: actions_( semantic_actions )
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{
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}
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static void throw_not_value( Iter_type begin, Iter_type end )
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{
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throw_error( begin, "not a value" );
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}
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static void throw_not_array( Iter_type begin, Iter_type end )
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{
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throw_error( begin, "not an array" );
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}
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static void throw_not_object( Iter_type begin, Iter_type end )
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{
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throw_error( begin, "not an object" );
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}
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static void throw_not_pair( Iter_type begin, Iter_type end )
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{
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throw_error( begin, "not a pair" );
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}
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static void throw_not_colon( Iter_type begin, Iter_type end )
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{
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throw_error( begin, "no colon in pair" );
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}
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static void throw_not_string( Iter_type begin, Iter_type end )
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{
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throw_error( begin, "not a string" );
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}
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template< typename ScannerT >
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class definition
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{
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public:
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definition( const Json_grammer& self )
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{
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using namespace spirit_namespace;
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typedef typename Value_type::String_type::value_type Char_type;
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// first we convert the semantic action class methods to functors with the
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// parameter signature expected by spirit
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typedef boost::function< void( Char_type ) > Char_action;
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typedef boost::function< void( Iter_type, Iter_type ) > Str_action;
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typedef boost::function< void( double ) > Real_action;
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typedef boost::function< void( boost::int64_t ) > Int_action;
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typedef boost::function< void( boost::uint64_t ) > Uint64_action;
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Char_action begin_obj ( boost::bind( &Semantic_actions_t::begin_obj, &self.actions_, _1 ) );
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Char_action end_obj ( boost::bind( &Semantic_actions_t::end_obj, &self.actions_, _1 ) );
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Char_action begin_array( boost::bind( &Semantic_actions_t::begin_array, &self.actions_, _1 ) );
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Char_action end_array ( boost::bind( &Semantic_actions_t::end_array, &self.actions_, _1 ) );
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Str_action new_name ( boost::bind( &Semantic_actions_t::new_name, &self.actions_, _1, _2 ) );
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Str_action new_str ( boost::bind( &Semantic_actions_t::new_str, &self.actions_, _1, _2 ) );
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Str_action new_true ( boost::bind( &Semantic_actions_t::new_true, &self.actions_, _1, _2 ) );
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Str_action new_false ( boost::bind( &Semantic_actions_t::new_false, &self.actions_, _1, _2 ) );
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Str_action new_null ( boost::bind( &Semantic_actions_t::new_null, &self.actions_, _1, _2 ) );
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Real_action new_real ( boost::bind( &Semantic_actions_t::new_real, &self.actions_, _1 ) );
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Int_action new_int ( boost::bind( &Semantic_actions_t::new_int, &self.actions_, _1 ) );
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Uint64_action new_uint64 ( boost::bind( &Semantic_actions_t::new_uint64, &self.actions_, _1 ) );
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// actual grammer
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json_
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= value_ | eps_p[ &throw_not_value ]
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;
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value_
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= string_[ new_str ]
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| number_
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| object_
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| array_
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| str_p( "true" ) [ new_true ]
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| str_p( "false" )[ new_false ]
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| str_p( "null" ) [ new_null ]
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;
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object_
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= ch_p('{')[ begin_obj ]
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>> !members_
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>> ( ch_p('}')[ end_obj ] | eps_p[ &throw_not_object ] )
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;
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members_
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= pair_ >> *( ',' >> pair_ )
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;
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pair_
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= string_[ new_name ]
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>> ( ':' | eps_p[ &throw_not_colon ] )
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>> ( value_ | eps_p[ &throw_not_value ] )
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;
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array_
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= ch_p('[')[ begin_array ]
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>> !elements_
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>> ( ch_p(']')[ end_array ] | eps_p[ &throw_not_array ] )
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;
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elements_
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= value_ >> *( ',' >> value_ )
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;
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string_
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= lexeme_d // this causes white space inside a string to be retained
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[
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confix_p
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(
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'"',
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*lex_escape_ch_p,
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'"'
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)
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]
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;
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number_
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= strict_real_p[ new_real ]
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| int64_p [ new_int ]
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| uint64_p [ new_uint64 ]
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;
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}
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spirit_namespace::rule< ScannerT > json_, object_, members_, pair_, array_, elements_, value_, string_, number_;
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const spirit_namespace::rule< ScannerT >& start() const { return json_; }
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};
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private:
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Json_grammer& operator=( const Json_grammer& ); // to prevent "assignment operator could not be generated" warning
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Semantic_actions_t& actions_;
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};
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template< class Iter_type, class Value_type >
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Iter_type read_range_or_throw( Iter_type begin, Iter_type end, Value_type& value )
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{
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Semantic_actions< Value_type, Iter_type > semantic_actions( value );
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const spirit_namespace::parse_info< Iter_type > info =
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spirit_namespace::parse( begin, end,
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Json_grammer< Value_type, Iter_type >( semantic_actions ),
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spirit_namespace::space_p );
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if( !info.hit )
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{
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assert( false ); // in theory exception should already have been thrown
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throw_error( info.stop, "error" );
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}
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return info.stop;
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}
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template< class Iter_type, class Value_type >
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void add_posn_iter_and_read_range_or_throw( Iter_type begin, Iter_type end, Value_type& value )
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{
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typedef spirit_namespace::position_iterator< Iter_type > Posn_iter_t;
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const Posn_iter_t posn_begin( begin, end );
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const Posn_iter_t posn_end( end, end );
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read_range_or_throw( posn_begin, posn_end, value );
|
|
}
|
|
|
|
template< class Iter_type, class Value_type >
|
|
bool read_range( Iter_type& begin, Iter_type end, Value_type& value )
|
|
{
|
|
try
|
|
{
|
|
begin = read_range_or_throw( begin, end, value );
|
|
|
|
return true;
|
|
}
|
|
catch( ... )
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
template< class String_type, class Value_type >
|
|
void read_string_or_throw( const String_type& s, Value_type& value )
|
|
{
|
|
add_posn_iter_and_read_range_or_throw( s.begin(), s.end(), value );
|
|
}
|
|
|
|
template< class String_type, class Value_type >
|
|
bool read_string( const String_type& s, Value_type& value )
|
|
{
|
|
typename String_type::const_iterator begin = s.begin();
|
|
|
|
return read_range( begin, s.end(), value );
|
|
}
|
|
|
|
template< class Istream_type >
|
|
struct Multi_pass_iters
|
|
{
|
|
typedef typename Istream_type::char_type Char_type;
|
|
typedef std::istream_iterator< Char_type, Char_type > istream_iter;
|
|
typedef spirit_namespace::multi_pass< istream_iter > Mp_iter;
|
|
|
|
Multi_pass_iters( Istream_type& is )
|
|
{
|
|
is.unsetf( std::ios::skipws );
|
|
|
|
begin_ = spirit_namespace::make_multi_pass( istream_iter( is ) );
|
|
end_ = spirit_namespace::make_multi_pass( istream_iter() );
|
|
}
|
|
|
|
Mp_iter begin_;
|
|
Mp_iter end_;
|
|
};
|
|
|
|
template< class Istream_type, class Value_type >
|
|
bool read_stream( Istream_type& is, Value_type& value )
|
|
{
|
|
Multi_pass_iters< Istream_type > mp_iters( is );
|
|
|
|
return read_range( mp_iters.begin_, mp_iters.end_, value );
|
|
}
|
|
|
|
template< class Istream_type, class Value_type >
|
|
void read_stream_or_throw( Istream_type& is, Value_type& value )
|
|
{
|
|
const Multi_pass_iters< Istream_type > mp_iters( is );
|
|
|
|
add_posn_iter_and_read_range_or_throw( mp_iters.begin_, mp_iters.end_, value );
|
|
}
|
|
}
|
|
|
|
#endif
|