templated input adapters
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7 changed files with 623 additions and 310 deletions
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@ -24,44 +24,46 @@ namespace detail
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// parser //
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////////////
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enum class parse_event_t : uint8_t
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{
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/// the parser read `{` and started to process a JSON object
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object_start,
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/// the parser read `}` and finished processing a JSON object
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object_end,
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/// the parser read `[` and started to process a JSON array
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array_start,
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/// the parser read `]` and finished processing a JSON array
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array_end,
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/// the parser read a key of a value in an object
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key,
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/// the parser finished reading a JSON value
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value
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};
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template<typename BasicJsonType>
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using parser_callback_t =
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std::function<bool(int depth, parse_event_t event, BasicJsonType& parsed)>;
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/*!
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@brief syntax analysis
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This class implements a recursive descent parser.
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*/
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template<typename BasicJsonType>
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template<typename BasicJsonType, typename InputAdapterType = input_adapter_protocol>
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class parser
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{
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using input_adapter_ptr_t = std::shared_ptr<InputAdapterType>;
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using number_integer_t = typename BasicJsonType::number_integer_t;
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using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
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using number_float_t = typename BasicJsonType::number_float_t;
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using string_t = typename BasicJsonType::string_t;
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using lexer_t = lexer<BasicJsonType>;
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using lexer_t = lexer<BasicJsonType, InputAdapterType>;
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using token_type = typename lexer_t::token_type;
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public:
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enum class parse_event_t : uint8_t
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{
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/// the parser read `{` and started to process a JSON object
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object_start,
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/// the parser read `}` and finished processing a JSON object
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object_end,
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/// the parser read `[` and started to process a JSON array
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array_start,
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/// the parser read `]` and finished processing a JSON array
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array_end,
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/// the parser read a key of a value in an object
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key,
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/// the parser finished reading a JSON value
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value
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};
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using parser_callback_t =
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std::function<bool(int depth, parse_event_t event, BasicJsonType& parsed)>;
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/// a parser reading from an input adapter
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explicit parser(detail::input_adapter_t&& adapter,
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const parser_callback_t cb = nullptr,
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explicit parser(input_adapter_ptr_t&& adapter,
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const parser_callback_t<BasicJsonType> cb = nullptr,
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const bool allow_exceptions_ = true)
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: callback(cb), m_lexer(std::move(adapter)), allow_exceptions(allow_exceptions_)
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{
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@ -486,7 +488,7 @@ class parser
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private:
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/// callback function
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const parser_callback_t callback = nullptr;
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const parser_callback_t<BasicJsonType> callback = nullptr;
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/// the type of the last read token
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token_type last_token = token_type::uninitialized;
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/// the lexer
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