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♻️ refactored SAX parser

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Niels Lohmann 2018-02-26 20:08:12 +01:00
parent 981e226ca2
commit 21352c4d8e
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GPG Key ID: 7F3CEA63AE251B69
7 changed files with 260 additions and 110 deletions
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1
Makefile
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@ -9,6 +9,7 @@ SRCS = include/nlohmann/json.hpp \
include/nlohmann/detail/exceptions.hpp \
include/nlohmann/detail/input/binary_reader.hpp \
include/nlohmann/detail/input/input_adapters.hpp \
include/nlohmann/detail/input/json_sax.hpp \
include/nlohmann/detail/input/lexer.hpp \
include/nlohmann/detail/input/parser.hpp \
include/nlohmann/detail/iterators/internal_iterator.hpp \

120
include/nlohmann/detail/input/json_sax.hpp Normal file
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@ -0,0 +1,120 @@
#pragma once
#include <cstddef>
#include <string>
#include <vector>
namespace nlohmann
{
/*!
@brief SAX interface
*/
template<typename BasicJsonType>
struct json_sax
{
/// type for (signed) integers
using number_integer_t = typename BasicJsonType::number_integer_t;
/// type for unsigned integers
using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
/// type for floating-point numbers
using number_float_t = typename BasicJsonType::number_float_t;
/*!
@brief a null value was read
@return whether parsing should proceed
*/
virtual bool null() = 0;
/*!
@brief a boolean value was read
@param[in] val boolean value
@return whether parsing should proceed
*/
virtual bool boolean(bool val) = 0;
/*!
@brief an integer number was read
@param[in] val integer value
@return whether parsing should proceed
*/
virtual bool number_integer(number_integer_t val) = 0;
/*!
@brief an unsigned integer number was read
@param[in] val unsigned integer value
@return whether parsing should proceed
*/
virtual bool number_unsigned(number_unsigned_t val) = 0;
/*!
@brief an floating-point number was read
@param[in] val floating-point value
@param[in] s raw token value
@return whether parsing should proceed
*/
virtual bool number_float(number_float_t val, const std::string& s) = 0;
/*!
@brief a string was read
@param[in] val string value
@return whether parsing should proceed
*/
virtual bool string(const std::string& val) = 0;
/*!
@brief the beginning of an object was read
@param[in] elements number of object elements or -1 if unknown
@return whether parsing should proceed
@note binary formats may report the number of elements
*/
virtual bool start_object(std::size_t elements) = 0;
/*!
@brief an object key was read
@param[in] val object key
@return whether parsing should proceed
*/
virtual bool key(const std::string& val) = 0;
/*!
@brief the end of an object was read
@return whether parsing should proceed
*/
virtual bool end_object() = 0;
/*!
@brief the beginning of an array was read
@param[in] elements number of array elements or -1 if unknown
@return whether parsing should proceed
@note binary formats may report the number of elements
*/
virtual bool start_array(std::size_t elements) = 0;
/*!
@brief the end of an array was read
@return whether parsing should proceed
*/
virtual bool end_array() = 0;
/*!
@brief a binary value was read
@param[in] val byte vector
@return whether parsing should proceed
@note examples are CBOR type 2 strings, MessagePack bin, and maybe UBJSON
array<uint8t>
*/
virtual bool binary(const std::vector<uint8_t>& val) = 0;
/*!
@brief a parse error occurred
@param[in] position the position in the input where the error occurs
@param[in] last_token the last read token
@return whether parsing should proceed
*/
virtual bool parse_error(std::size_t position, const std::string& last_token) = 0;
virtual ~json_sax() = default;
};
}

54
include/nlohmann/detail/input/parser.hpp
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@ -10,6 +10,7 @@
#include <nlohmann/detail/exceptions.hpp>
#include <nlohmann/detail/macro_scope.hpp>
#include <nlohmann/detail/input/input_adapters.hpp>
#include <nlohmann/detail/input/json_sax.hpp>
#include <nlohmann/detail/input/lexer.hpp>
#include <nlohmann/detail/value_t.hpp>
@ -52,54 +53,7 @@ class parser
value
};
struct SAX
{
/// a null value was read
virtual bool null() = 0;
/// a boolean value was read
virtual bool boolean(bool) = 0;
/// an integer number was read
virtual bool number_integer(number_integer_t) = 0;
/// an unsigned integer number was read
virtual bool number_unsigned(number_unsigned_t) = 0;
/// a floating-point number was read
/// the string parameter contains the raw number value
virtual bool number_float(number_float_t, const std::string&) = 0;
/// a string value was read
virtual bool string(const std::string&) = 0;
/// the beginning of an object was read
/// binary formats may report the number of elements
virtual bool start_object(std::size_t elements) = 0;
/// an object key was read
virtual bool key(const std::string&) = 0;
/// the end of an object was read
virtual bool end_object() = 0;
/// the beginning of an array was read
/// binary formats may report the number of elements
virtual bool start_array(std::size_t elements) = 0;
/// the end of an array was read
virtual bool end_array() = 0;
/// a binary value was read
/// examples are CBOR type 2 strings, MessagePack bin, and maybe UBJSON array<uint8t>
virtual bool binary(const std::vector<uint8_t>& vec) = 0;
/// a parse error occurred
/// the byte position and the last token are reported
virtual bool parse_error(std::size_t position, const std::string& last_token) = 0;
virtual ~SAX() = default;
};
using json_sax = json_sax<BasicJsonType>;
using parser_callback_t =
std::function<bool(int depth, parse_event_t event, BasicJsonType& parsed)>;
@ -111,7 +65,7 @@ class parser
: callback(cb), m_lexer(adapter), allow_exceptions(allow_exceptions_)
{}
parser(detail::input_adapter_t adapter, SAX* s)
parser(detail::input_adapter_t adapter, json_sax* s)
: m_lexer(adapter), sax(s)
{}
@ -818,7 +772,7 @@ class parser
/// whether to throw exceptions in case of errors
const bool allow_exceptions = true;
/// associated SAX parse event receiver
SAX* sax = nullptr;
json_sax* sax = nullptr;
};
}
}

8
include/nlohmann/json.hpp
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@ -1105,7 +1105,7 @@ class basic_json
*/
using parser_callback_t = typename parser::parser_callback_t;
using SAX = typename parser::SAX;
using json_sax = typename parser::json_sax;
//////////////////
// constructors //
@ -5926,12 +5926,12 @@ class basic_json
return parser(i).accept(true);
}
static bool sax_parse(detail::input_adapter i, SAX* sax)
static bool sax_parse(detail::input_adapter i, json_sax* sax)
{
return parser(i, sax).sax_parse();
}
static bool sax_parse(detail::input_adapter& i, SAX* sax)
static bool sax_parse(detail::input_adapter& i, json_sax* sax)
{
return parser(i, sax).sax_parse();
}
@ -6009,7 +6009,7 @@ class basic_json
std::is_base_of<
std::random_access_iterator_tag,
typename std::iterator_traits<IteratorType>::iterator_category>::value, int>::type = 0>
static bool sax_parse(IteratorType first, IteratorType last, SAX* sax)
static bool sax_parse(IteratorType first, IteratorType last, json_sax* sax)
{
return parser(detail::input_adapter(first, last), sax).sax_parse();
}

183
single_include/nlohmann/json.hpp
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@ -3131,6 +3131,128 @@ scan_number_done:
// #include <nlohmann/detail/input/input_adapters.hpp>
// #include <nlohmann/detail/input/json_sax.hpp>
#include <cstddef>
#include <string>
#include <vector>
namespace nlohmann
{
/*!
@brief SAX interface
*/
template<typename BasicJsonType>
struct json_sax
{
/// type for (signed) integers
using number_integer_t = typename BasicJsonType::number_integer_t;
/// type for unsigned integers
using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
/// type for floating-point numbers
using number_float_t = typename BasicJsonType::number_float_t;
/*!
@brief a null value was read
@return whether parsing should proceed
*/
virtual bool null() = 0;
/*!
@brief a boolean value was read
@param[in] val boolean value
@return whether parsing should proceed
*/
virtual bool boolean(bool val) = 0;
/*!
@brief an integer number was read
@param[in] val integer value
@return whether parsing should proceed
*/
virtual bool number_integer(number_integer_t val) = 0;
/*!
@brief an unsigned integer number was read
@param[in] val unsigned integer value
@return whether parsing should proceed
*/
virtual bool number_unsigned(number_unsigned_t val) = 0;
/*!
@brief an floating-point number was read
@param[in] val floating-point value
@param[in] s raw token value
@return whether parsing should proceed
*/
virtual bool number_float(number_float_t val, const std::string& s) = 0;
/*!
@brief a string was read
@param[in] val string value
@return whether parsing should proceed
*/
virtual bool string(const std::string& val) = 0;
/*!
@brief the beginning of an object was read
@param[in] elements number of object elements or -1 if unknown
@return whether parsing should proceed
@note binary formats may report the number of elements
*/
virtual bool start_object(std::size_t elements) = 0;
/*!
@brief an object key was read
@param[in] val object key
@return whether parsing should proceed
*/
virtual bool key(const std::string& val) = 0;
/*!
@brief the end of an object was read
@return whether parsing should proceed
*/
virtual bool end_object() = 0;
/*!
@brief the beginning of an array was read
@param[in] elements number of array elements or -1 if unknown
@return whether parsing should proceed
@note binary formats may report the number of elements
*/
virtual bool start_array(std::size_t elements) = 0;
/*!
@brief the end of an array was read
@return whether parsing should proceed
*/
virtual bool end_array() = 0;
/*!
@brief a binary value was read
@param[in] val byte vector
@return whether parsing should proceed
@note examples are CBOR type 2 strings, MessagePack bin, and maybe UBJSON
array<uint8t>
*/
virtual bool binary(const std::vector<uint8_t>& val) = 0;
/*!
@brief a parse error occurred
@param[in] position the position in the input where the error occurs
@param[in] last_token the last read token
@return whether parsing should proceed
*/
virtual bool parse_error(std::size_t position, const std::string& last_token) = 0;
virtual ~json_sax() = default;
};
}
// #include <nlohmann/detail/input/lexer.hpp>
// #include <nlohmann/detail/value_t.hpp>
@ -3175,54 +3297,7 @@ class parser
value
};
struct SAX
{
/// a null value was read
virtual bool null() = 0;
/// a boolean value was read
virtual bool boolean(bool) = 0;
/// an integer number was read
virtual bool number_integer(number_integer_t) = 0;
/// an unsigned integer number was read
virtual bool number_unsigned(number_unsigned_t) = 0;
/// a floating-point number was read
/// the string parameter contains the raw number value
virtual bool number_float(number_float_t, const std::string&) = 0;
/// a string value was read
virtual bool string(const std::string&) = 0;
/// the beginning of an object was read
/// binary formats may report the number of elements
virtual bool start_object(std::size_t elements) = 0;
/// an object key was read
virtual bool key(const std::string&) = 0;
/// the end of an object was read
virtual bool end_object() = 0;
/// the beginning of an array was read
/// binary formats may report the number of elements
virtual bool start_array(std::size_t elements) = 0;
/// the end of an array was read
virtual bool end_array() = 0;
/// a binary value was read
/// examples are CBOR type 2 strings, MessagePack bin, and maybe UBJSON array<uint8t>
virtual bool binary(const std::vector<uint8_t>& vec) = 0;
/// a parse error occurred
/// the byte position and the last token are reported
virtual bool parse_error(std::size_t position, const std::string& last_token) = 0;
virtual ~SAX() = default;
};
using json_sax = json_sax<BasicJsonType>;
using parser_callback_t =
std::function<bool(int depth, parse_event_t event, BasicJsonType& parsed)>;
@ -3234,7 +3309,7 @@ class parser
: callback(cb), m_lexer(adapter), allow_exceptions(allow_exceptions_)
{}
parser(detail::input_adapter_t adapter, SAX* s)
parser(detail::input_adapter_t adapter, json_sax* s)
: m_lexer(adapter), sax(s)
{}
@ -3941,7 +4016,7 @@ class parser
/// whether to throw exceptions in case of errors
const bool allow_exceptions = true;
/// associated SAX parse event receiver
SAX* sax = nullptr;
json_sax* sax = nullptr;
};
}
}
@ -10938,7 +11013,7 @@ class basic_json
*/
using parser_callback_t = typename parser::parser_callback_t;
using SAX = typename parser::SAX;
using json_sax = typename parser::json_sax;
//////////////////
// constructors //
@ -15759,12 +15834,12 @@ class basic_json
return parser(i).accept(true);
}
static bool sax_parse(detail::input_adapter i, SAX* sax)
static bool sax_parse(detail::input_adapter i, json_sax* sax)
{
return parser(i, sax).sax_parse();
}
static bool sax_parse(detail::input_adapter& i, SAX* sax)
static bool sax_parse(detail::input_adapter& i, json_sax* sax)
{
return parser(i, sax).sax_parse();
}
@ -15842,7 +15917,7 @@ class basic_json
std::is_base_of<
std::random_access_iterator_tag,
typename std::iterator_traits<IteratorType>::iterator_category>::value, int>::type = 0>
static bool sax_parse(IteratorType first, IteratorType last, SAX* sax)
static bool sax_parse(IteratorType first, IteratorType last, json_sax* sax)
{
return parser(detail::input_adapter(first, last), sax).sax_parse();
}

2
test/src/unit-class_parser.cpp
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@ -34,7 +34,7 @@ using nlohmann::json;
#include <valarray>
class SaxEventLogger : public nlohmann::json::SAX
class SaxEventLogger : public nlohmann::json::json_sax
{
public:
bool null() override

2
test/src/unit-deserialization.cpp
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@ -34,7 +34,7 @@ using nlohmann::json;
#include <iostream>
#include <valarray>
struct SaxEventLogger : public nlohmann::json::SAX
struct SaxEventLogger : public nlohmann::json::json_sax
{
bool null() override
{