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🚧 support for UBJSON high-precision numbers #2286

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Niels Lohmann 2020-07-20 13:12:20 +02:00
parent 7cf2fe149c
commit 7360e09830
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GPG key ID: 7F3CEA63AE251B69
5 changed files with 81 additions and 18 deletions
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1
include/nlohmann/detail/exceptions.hpp
View file

@ -97,6 +97,7 @@ json.exception.parse_error.110 | parse error at 1: cannot read 2 bytes from vect
json.exception.parse_error.112 | parse error at 1: error reading CBOR; last byte: 0xF8 | Not all types of CBOR or MessagePack are supported. This exception occurs if an unsupported byte was read.
json.exception.parse_error.113 | parse error at 2: expected a CBOR string; last byte: 0x98 | While parsing a map key, a value that is not a string has been read.
json.exception.parse_error.114 | parse error: Unsupported BSON record type 0x0F | The parsing of the corresponding BSON record type is not implemented (yet).
json.exception.parse_error.115 | parse error at byte 5: syntax error while parsing UBJSON high-precision number: invalid number text: 1A | A UBJSON high-precision number could not be parsed.
@note For an input with n bytes, 1 is the index of the first character and n+1
is the index of the terminating null byte or the end of file. This also

29
include/nlohmann/detail/input/binary_reader.hpp
View file

@ -2003,30 +2003,45 @@ class binary_reader
case 'H':
{
// get size of following number string
std::size_t size{};
auto res = get_ubjson_size_value(size);
if (JSON_HEDLEY_UNLIKELY(!res))
{
return res;
}
// get number string
std::string s;
for (int i = 0; i < size; ++i)
for (std::size_t i = 0; i < size; ++i)
{
get();
s.push_back(current);
}
// parse number string
auto ia = detail::input_adapter(std::forward<std::string>(s));
auto l = detail::lexer<BasicJsonType, decltype(ia)>(std::move(ia), false);
auto result = l.scan();
const auto result_number = l.scan();
const auto result_remainder = l.scan();
switch (result)
using token_type = typename detail::lexer_base<BasicJsonType>::token_type;
if (JSON_HEDLEY_UNLIKELY(result_remainder != token_type::end_of_input))
{
case detail::lexer_base<BasicJsonType>::token_type::value_integer:
return sax->parse_error(chars_read, s, parse_error::create(115, chars_read, exception_message(input_format_t::ubjson, "invalid number text: " + s, "high-precision number")));
}
switch (result_number)
{
case token_type::value_integer:
return sax->number_integer(l.get_number_integer());
case detail::lexer_base<BasicJsonType>::token_type::value_unsigned:
case token_type::value_unsigned:
return sax->number_unsigned(l.get_number_unsigned());
case detail::lexer_base<BasicJsonType>::token_type::value_float:
case token_type::value_float:
return sax->number_float(l.get_number_float(), std::move(s));
default:
return sax->parse_error(chars_read, s, parse_error::create(113, chars_read, exception_message(input_format_t::ubjson, "invalid number", "number")));
return sax->parse_error(chars_read, s, parse_error::create(115, chars_read, exception_message(input_format_t::ubjson, "invalid number text: " + s, "high-precision number")));
}
}

1
include/nlohmann/json.hpp
View file

@ -7686,6 +7686,7 @@ class basic_json
int16 | number_integer | `I`
int32 | number_integer | `l`
int64 | number_integer | `L`
high-precision number | number_integer, number_unsigned, or number_float - depends on number string | 'H'
string | string | `S`
char | string | `C`
array | array (optimized values are supported) | `[`

31
single_include/nlohmann/json.hpp
View file

@ -2280,6 +2280,7 @@ json.exception.parse_error.110 | parse error at 1: cannot read 2 bytes from vect
json.exception.parse_error.112 | parse error at 1: error reading CBOR; last byte: 0xF8 | Not all types of CBOR or MessagePack are supported. This exception occurs if an unsupported byte was read.
json.exception.parse_error.113 | parse error at 2: expected a CBOR string; last byte: 0x98 | While parsing a map key, a value that is not a string has been read.
json.exception.parse_error.114 | parse error: Unsupported BSON record type 0x0F | The parsing of the corresponding BSON record type is not implemented (yet).
json.exception.parse_error.115 | parse error at byte 5: syntax error while parsing UBJSON high-precision number: invalid number text: 1A | A UBJSON high-precision number could not be parsed.
@note For an input with n bytes, 1 is the index of the first character and n+1
is the index of the terminating null byte or the end of file. This also
@ -9502,30 +9503,45 @@ class binary_reader
case 'H':
{
// get size of following number string
std::size_t size{};
auto res = get_ubjson_size_value(size);
if (JSON_HEDLEY_UNLIKELY(!res))
{
return res;
}
// get number string
std::string s;
for (int i = 0; i < size; ++i)
for (std::size_t i = 0; i < size; ++i)
{
get();
s.push_back(current);
}
// parse number string
auto ia = detail::input_adapter(std::forward<std::string>(s));
auto l = detail::lexer<BasicJsonType, decltype(ia)>(std::move(ia), false);
auto result = l.scan();
const auto result_number = l.scan();
const auto result_remainder = l.scan();
switch (result)
using token_type = typename detail::lexer_base<BasicJsonType>::token_type;
if (JSON_HEDLEY_UNLIKELY(result_remainder != token_type::end_of_input))
{
case detail::lexer_base<BasicJsonType>::token_type::value_integer:
return sax->parse_error(chars_read, s, parse_error::create(115, chars_read, exception_message(input_format_t::ubjson, "invalid number text: " + s, "high-precision number")));
}
switch (result_number)
{
case token_type::value_integer:
return sax->number_integer(l.get_number_integer());
case detail::lexer_base<BasicJsonType>::token_type::value_unsigned:
case token_type::value_unsigned:
return sax->number_unsigned(l.get_number_unsigned());
case detail::lexer_base<BasicJsonType>::token_type::value_float:
case token_type::value_float:
return sax->number_float(l.get_number_float(), std::move(s));
default:
return sax->parse_error(chars_read, s, parse_error::create(113, chars_read, exception_message(input_format_t::ubjson, "invalid number", "number")));
return sax->parse_error(chars_read, s, parse_error::create(115, chars_read, exception_message(input_format_t::ubjson, "invalid number text: " + s, "high-precision number")));
}
}
@ -23881,6 +23897,7 @@ class basic_json
int16 | number_integer | `I`
int32 | number_integer | `l`
int64 | number_integer | `L`
high-precision number | number_integer, number_unsigned, or number_float - depends on number string | 'H'
string | string | `S`
char | string | `C`
array | array (optimized values are supported) | `[`

37
test/src/unit-ubjson.cpp
View file

@ -770,10 +770,39 @@ TEST_CASE("UBJSON")
SECTION("high-precision number")
{
std::vector<uint8_t> vec = {'H', 'i', 0x16, '3', '.', '1', '4', '1', '5', '9', '2', '6', '5', '3', '5', '8', '9', '7', '9', '3', '2', '3', '8', '4', '6'};
const auto j = json::from_ubjson(vec);
CHECK(j.is_number_float());
CHECK(j.dump() == "3.141592653589793");
SECTION("unsigned integer number")
{
std::vector<uint8_t> vec = {'H', 'i', 0x14, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0'};
const auto j = json::from_ubjson(vec);
CHECK(j.is_number_unsigned());
CHECK(j.dump() == "12345678901234567890");
}
SECTION("signed integer number")
{
std::vector<uint8_t> vec = {'H', 'i', 0x13, '-', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8'};
const auto j = json::from_ubjson(vec);
CHECK(j.is_number_integer());
CHECK(j.dump() == "-123456789012345678");
}
SECTION("floating-point number")
{
std::vector<uint8_t> vec = {'H', 'i', 0x16, '3', '.', '1', '4', '1', '5', '9', '2', '6', '5', '3', '5', '8', '9', '7', '9', '3', '2', '3', '8', '4', '6'};
const auto j = json::from_ubjson(vec);
CHECK(j.is_number_float());
CHECK(j.dump() == "3.141592653589793");
}
SECTION("errors")
{
std::vector<uint8_t> vec1 = {'H', 'i', 2, '1', 'A', '3'};
CHECK_THROWS_WITH_AS(json::from_ubjson(vec1), "[json.exception.parse_error.115] parse error at byte 5: syntax error while parsing UBJSON high-precision number: invalid number text: 1A", json::parse_error);
std::vector<uint8_t> vec2 = {'H', 'i', 2, '1', '.'};
CHECK_THROWS_WITH_AS(json::from_ubjson(vec2), "[json.exception.parse_error.115] parse error at byte 5: syntax error while parsing UBJSON high-precision number: invalid number text: 1.", json::parse_error);
std::vector<uint8_t> vec3 = {'H', 2, '1', '0'};
CHECK_THROWS_WITH_AS(json::from_ubjson(vec3), "[json.exception.parse_error.113] parse error at byte 2: syntax error while parsing UBJSON size: expected length type specification (U, i, I, l, L) after '#'; last byte: 0x02", json::parse_error);
}
}
}