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Diffstat (limited to 'json/json_spirit_reader_template.h')
| -rw-r--r-- | json/json_spirit_reader_template.h | 612 |
1 files changed, 612 insertions, 0 deletions
diff --git a/json/json_spirit_reader_template.h b/json/json_spirit_reader_template.h new file mode 100644 index 0000000000..81cded4346 --- /dev/null +++ b/json/json_spirit_reader_template.h @@ -0,0 +1,612 @@ +#ifndef JSON_SPIRIT_READER_TEMPLATE
+#define JSON_SPIRIT_READER_TEMPLATE
+
+// Copyright John W. Wilkinson 2007 - 2009.
+// Distributed under the MIT License, see accompanying file LICENSE.txt
+
+// json spirit version 4.03
+
+#include "json_spirit_value.h"
+#include "json_spirit_error_position.h"
+
+//#define BOOST_SPIRIT_THREADSAFE // uncomment for multithreaded use, requires linking to boost.thread
+
+#include <boost/bind.hpp>
+#include <boost/function.hpp>
+#include <boost/version.hpp>
+
+#if BOOST_VERSION >= 103800
+ #include <boost/spirit/include/classic_core.hpp>
+ #include <boost/spirit/include/classic_confix.hpp>
+ #include <boost/spirit/include/classic_escape_char.hpp>
+ #include <boost/spirit/include/classic_multi_pass.hpp>
+ #include <boost/spirit/include/classic_position_iterator.hpp>
+ #define spirit_namespace boost::spirit::classic
+#else
+ #include <boost/spirit/core.hpp>
+ #include <boost/spirit/utility/confix.hpp>
+ #include <boost/spirit/utility/escape_char.hpp>
+ #include <boost/spirit/iterator/multi_pass.hpp>
+ #include <boost/spirit/iterator/position_iterator.hpp>
+ #define spirit_namespace boost::spirit
+#endif
+
+namespace json_spirit
+{
+ const spirit_namespace::int_parser < boost::int64_t > int64_p = spirit_namespace::int_parser < boost::int64_t >();
+ const spirit_namespace::uint_parser< boost::uint64_t > uint64_p = spirit_namespace::uint_parser< boost::uint64_t >();
+
+ template< class Iter_type >
+ bool is_eq( Iter_type first, Iter_type last, const char* c_str )
+ {
+ for( Iter_type i = first; i != last; ++i, ++c_str )
+ {
+ if( *c_str == 0 ) return false;
+
+ if( *i != *c_str ) return false;
+ }
+
+ return true;
+ }
+
+ template< class Char_type >
+ Char_type hex_to_num( const Char_type c )
+ {
+ if( ( c >= '0' ) && ( c <= '9' ) ) return c - '0';
+ if( ( c >= 'a' ) && ( c <= 'f' ) ) return c - 'a' + 10;
+ if( ( c >= 'A' ) && ( c <= 'F' ) ) return c - 'A' + 10;
+ return 0;
+ }
+
+ template< class Char_type, class Iter_type >
+ Char_type hex_str_to_char( Iter_type& begin )
+ {
+ const Char_type c1( *( ++begin ) );
+ const Char_type c2( *( ++begin ) );
+
+ return ( hex_to_num( c1 ) << 4 ) + hex_to_num( c2 );
+ }
+
+ template< class Char_type, class Iter_type >
+ Char_type unicode_str_to_char( Iter_type& begin )
+ {
+ const Char_type c1( *( ++begin ) );
+ const Char_type c2( *( ++begin ) );
+ const Char_type c3( *( ++begin ) );
+ const Char_type c4( *( ++begin ) );
+
+ return ( hex_to_num( c1 ) << 12 ) +
+ ( hex_to_num( c2 ) << 8 ) +
+ ( hex_to_num( c3 ) << 4 ) +
+ hex_to_num( c4 );
+ }
+
+ template< class String_type >
+ void append_esc_char_and_incr_iter( String_type& s,
+ typename String_type::const_iterator& begin,
+ typename String_type::const_iterator end )
+ {
+ typedef typename String_type::value_type Char_type;
+
+ const Char_type c2( *begin );
+
+ switch( c2 )
+ {
+ case 't': s += '\t'; break;
+ case 'b': s += '\b'; break;
+ case 'f': s += '\f'; break;
+ case 'n': s += '\n'; break;
+ case 'r': s += '\r'; break;
+ case '\\': s += '\\'; break;
+ case '/': s += '/'; break;
+ case '"': s += '"'; break;
+ case 'x':
+ {
+ if( end - begin >= 3 ) // expecting "xHH..."
+ {
+ s += hex_str_to_char< Char_type >( begin );
+ }
+ break;
+ }
+ case 'u':
+ {
+ if( end - begin >= 5 ) // expecting "uHHHH..."
+ {
+ s += unicode_str_to_char< Char_type >( begin );
+ }
+ break;
+ }
+ }
+ }
+
+ template< class String_type >
+ String_type substitute_esc_chars( typename String_type::const_iterator begin,
+ typename String_type::const_iterator end )
+ {
+ typedef typename String_type::const_iterator Iter_type;
+
+ if( end - begin < 2 ) return String_type( begin, end );
+
+ String_type result;
+
+ result.reserve( end - begin );
+
+ const Iter_type end_minus_1( end - 1 );
+
+ Iter_type substr_start = begin;
+ Iter_type i = begin;
+
+ for( ; i < end_minus_1; ++i )
+ {
+ if( *i == '\\' )
+ {
+ result.append( substr_start, i );
+
+ ++i; // skip the '\'
+
+ append_esc_char_and_incr_iter( result, i, end );
+
+ substr_start = i + 1;
+ }
+ }
+
+ result.append( substr_start, end );
+
+ return result;
+ }
+
+ template< class String_type >
+ String_type get_str_( typename String_type::const_iterator begin,
+ typename String_type::const_iterator end )
+ {
+ assert( end - begin >= 2 );
+
+ typedef typename String_type::const_iterator Iter_type;
+
+ Iter_type str_without_quotes( ++begin );
+ Iter_type end_without_quotes( --end );
+
+ return substitute_esc_chars< String_type >( str_without_quotes, end_without_quotes );
+ }
+
+ inline std::string get_str( std::string::const_iterator begin, std::string::const_iterator end )
+ {
+ return get_str_< std::string >( begin, end );
+ }
+
+ inline std::wstring get_str( std::wstring::const_iterator begin, std::wstring::const_iterator end )
+ {
+ return get_str_< std::wstring >( begin, end );
+ }
+
+ template< class String_type, class Iter_type >
+ String_type get_str( Iter_type begin, Iter_type end )
+ {
+ const String_type tmp( begin, end ); // convert multipass iterators to string iterators
+
+ return get_str( tmp.begin(), tmp.end() );
+ }
+
+ // this class's methods get called by the spirit parse resulting
+ // in the creation of a JSON object or array
+ //
+ // NB Iter_type could be a std::string iterator, wstring iterator, a position iterator or a multipass iterator
+ //
+ template< class Value_type, class Iter_type >
+ class Semantic_actions
+ {
+ public:
+
+ typedef typename Value_type::Config_type Config_type;
+ typedef typename Config_type::String_type String_type;
+ typedef typename Config_type::Object_type Object_type;
+ typedef typename Config_type::Array_type Array_type;
+ typedef typename String_type::value_type Char_type;
+
+ Semantic_actions( Value_type& value )
+ : value_( value )
+ , current_p_( 0 )
+ {
+ }
+
+ void begin_obj( Char_type c )
+ {
+ assert( c == '{' );
+
+ begin_compound< Object_type >();
+ }
+
+ void end_obj( Char_type c )
+ {
+ assert( c == '}' );
+
+ end_compound();
+ }
+
+ void begin_array( Char_type c )
+ {
+ assert( c == '[' );
+
+ begin_compound< Array_type >();
+ }
+
+ void end_array( Char_type c )
+ {
+ assert( c == ']' );
+
+ end_compound();
+ }
+
+ void new_name( Iter_type begin, Iter_type end )
+ {
+ assert( current_p_->type() == obj_type );
+
+ name_ = get_str< String_type >( begin, end );
+ }
+
+ void new_str( Iter_type begin, Iter_type end )
+ {
+ add_to_current( get_str< String_type >( begin, end ) );
+ }
+
+ void new_true( Iter_type begin, Iter_type end )
+ {
+ assert( is_eq( begin, end, "true" ) );
+
+ add_to_current( true );
+ }
+
+ void new_false( Iter_type begin, Iter_type end )
+ {
+ assert( is_eq( begin, end, "false" ) );
+
+ add_to_current( false );
+ }
+
+ void new_null( Iter_type begin, Iter_type end )
+ {
+ assert( is_eq( begin, end, "null" ) );
+
+ add_to_current( Value_type() );
+ }
+
+ void new_int( boost::int64_t i )
+ {
+ add_to_current( i );
+ }
+
+ void new_uint64( boost::uint64_t ui )
+ {
+ add_to_current( ui );
+ }
+
+ void new_real( double d )
+ {
+ add_to_current( d );
+ }
+
+ private:
+
+ Semantic_actions& operator=( const Semantic_actions& );
+ // to prevent "assignment operator could not be generated" warning
+
+ Value_type* add_first( const Value_type& value )
+ {
+ assert( current_p_ == 0 );
+
+ value_ = value;
+ current_p_ = &value_;
+ return current_p_;
+ }
+
+ template< class Array_or_obj >
+ void begin_compound()
+ {
+ if( current_p_ == 0 )
+ {
+ add_first( Array_or_obj() );
+ }
+ else
+ {
+ stack_.push_back( current_p_ );
+
+ Array_or_obj new_array_or_obj; // avoid copy by building new array or object in place
+
+ current_p_ = add_to_current( new_array_or_obj );
+ }
+ }
+
+ void end_compound()
+ {
+ if( current_p_ != &value_ )
+ {
+ current_p_ = stack_.back();
+
+ stack_.pop_back();
+ }
+ }
+
+ Value_type* add_to_current( const Value_type& value )
+ {
+ if( current_p_ == 0 )
+ {
+ return add_first( value );
+ }
+ else if( current_p_->type() == array_type )
+ {
+ current_p_->get_array().push_back( value );
+
+ return ¤t_p_->get_array().back();
+ }
+
+ assert( current_p_->type() == obj_type );
+
+ return &Config_type::add( current_p_->get_obj(), name_, value );
+ }
+
+ Value_type& value_; // this is the object or array that is being created
+ Value_type* current_p_; // the child object or array that is currently being constructed
+
+ std::vector< Value_type* > stack_; // previous child objects and arrays
+
+ String_type name_; // of current name/value pair
+ };
+
+ template< typename Iter_type >
+ void throw_error( spirit_namespace::position_iterator< Iter_type > i, const std::string& reason )
+ {
+ throw Error_position( i.get_position().line, i.get_position().column, reason );
+ }
+
+ template< typename Iter_type >
+ void throw_error( Iter_type i, const std::string& reason )
+ {
+ throw reason;
+ }
+
+ // the spirit grammer
+ //
+ template< class Value_type, class Iter_type >
+ class Json_grammer : public spirit_namespace::grammar< Json_grammer< Value_type, Iter_type > >
+ {
+ public:
+
+ typedef Semantic_actions< Value_type, Iter_type > Semantic_actions_t;
+
+ Json_grammer( Semantic_actions_t& semantic_actions )
+ : actions_( semantic_actions )
+ {
+ }
+
+ static void throw_not_value( Iter_type begin, Iter_type end )
+ {
+ throw_error( begin, "not a value" );
+ }
+
+ static void throw_not_array( Iter_type begin, Iter_type end )
+ {
+ throw_error( begin, "not an array" );
+ }
+
+ static void throw_not_object( Iter_type begin, Iter_type end )
+ {
+ throw_error( begin, "not an object" );
+ }
+
+ static void throw_not_pair( Iter_type begin, Iter_type end )
+ {
+ throw_error( begin, "not a pair" );
+ }
+
+ static void throw_not_colon( Iter_type begin, Iter_type end )
+ {
+ throw_error( begin, "no colon in pair" );
+ }
+
+ static void throw_not_string( Iter_type begin, Iter_type end )
+ {
+ throw_error( begin, "not a string" );
+ }
+
+ template< typename ScannerT >
+ class definition
+ {
+ public:
+
+ definition( const Json_grammer& self )
+ {
+ using namespace spirit_namespace;
+
+ typedef typename Value_type::String_type::value_type Char_type;
+
+ // first we convert the semantic action class methods to functors with the
+ // parameter signature expected by spirit
+
+ typedef boost::function< void( Char_type ) > Char_action;
+ typedef boost::function< void( Iter_type, Iter_type ) > Str_action;
+ typedef boost::function< void( double ) > Real_action;
+ typedef boost::function< void( boost::int64_t ) > Int_action;
+ typedef boost::function< void( boost::uint64_t ) > Uint64_action;
+
+ Char_action begin_obj ( boost::bind( &Semantic_actions_t::begin_obj, &self.actions_, _1 ) );
+ Char_action end_obj ( boost::bind( &Semantic_actions_t::end_obj, &self.actions_, _1 ) );
+ Char_action begin_array( boost::bind( &Semantic_actions_t::begin_array, &self.actions_, _1 ) );
+ Char_action end_array ( boost::bind( &Semantic_actions_t::end_array, &self.actions_, _1 ) );
+ Str_action new_name ( boost::bind( &Semantic_actions_t::new_name, &self.actions_, _1, _2 ) );
+ Str_action new_str ( boost::bind( &Semantic_actions_t::new_str, &self.actions_, _1, _2 ) );
+ Str_action new_true ( boost::bind( &Semantic_actions_t::new_true, &self.actions_, _1, _2 ) );
+ Str_action new_false ( boost::bind( &Semantic_actions_t::new_false, &self.actions_, _1, _2 ) );
+ Str_action new_null ( boost::bind( &Semantic_actions_t::new_null, &self.actions_, _1, _2 ) );
+ Real_action new_real ( boost::bind( &Semantic_actions_t::new_real, &self.actions_, _1 ) );
+ Int_action new_int ( boost::bind( &Semantic_actions_t::new_int, &self.actions_, _1 ) );
+ Uint64_action new_uint64 ( boost::bind( &Semantic_actions_t::new_uint64, &self.actions_, _1 ) );
+
+ // actual grammer
+
+ json_
+ = value_ | eps_p[ &throw_not_value ]
+ ;
+
+ value_
+ = string_[ new_str ]
+ | number_
+ | object_
+ | array_
+ | str_p( "true" ) [ new_true ]
+ | str_p( "false" )[ new_false ]
+ | str_p( "null" ) [ new_null ]
+ ;
+
+ object_
+ = ch_p('{')[ begin_obj ]
+ >> !members_
+ >> ( ch_p('}')[ end_obj ] | eps_p[ &throw_not_object ] )
+ ;
+
+ members_
+ = pair_ >> *( ',' >> pair_ )
+ ;
+
+ pair_
+ = string_[ new_name ]
+ >> ( ':' | eps_p[ &throw_not_colon ] )
+ >> ( value_ | eps_p[ &throw_not_value ] )
+ ;
+
+ array_
+ = ch_p('[')[ begin_array ]
+ >> !elements_
+ >> ( ch_p(']')[ end_array ] | eps_p[ &throw_not_array ] )
+ ;
+
+ elements_
+ = value_ >> *( ',' >> value_ )
+ ;
+
+ string_
+ = lexeme_d // this causes white space inside a string to be retained
+ [
+ confix_p
+ (
+ '"',
+ *lex_escape_ch_p,
+ '"'
+ )
+ ]
+ ;
+
+ number_
+ = strict_real_p[ new_real ]
+ | int64_p [ new_int ]
+ | uint64_p [ new_uint64 ]
+ ;
+ }
+
+ spirit_namespace::rule< ScannerT > json_, object_, members_, pair_, array_, elements_, value_, string_, number_;
+
+ const spirit_namespace::rule< ScannerT >& start() const { return json_; }
+ };
+
+ private:
+
+ Json_grammer& operator=( const Json_grammer& ); // to prevent "assignment operator could not be generated" warning
+
+ Semantic_actions_t& actions_;
+ };
+
+ template< class Iter_type, class Value_type >
+ Iter_type read_range_or_throw( Iter_type begin, Iter_type end, Value_type& value )
+ {
+ Semantic_actions< Value_type, Iter_type > semantic_actions( value );
+
+ const spirit_namespace::parse_info< Iter_type > info =
+ spirit_namespace::parse( begin, end,
+ Json_grammer< Value_type, Iter_type >( semantic_actions ),
+ spirit_namespace::space_p );
+
+ if( !info.hit )
+ {
+ assert( false ); // in theory exception should already have been thrown
+ throw_error( info.stop, "error" );
+ }
+
+ return info.stop;
+ }
+
+ template< class Iter_type, class Value_type >
+ void add_posn_iter_and_read_range_or_throw( Iter_type begin, Iter_type end, Value_type& value )
+ {
+ typedef spirit_namespace::position_iterator< Iter_type > Posn_iter_t;
+
+ const Posn_iter_t posn_begin( begin, end );
+ const Posn_iter_t posn_end( end, end );
+
+ 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
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