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🔨 optimized output format

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This commit is contained in:
Niels Lohmann 2018-01-10 11:22:19 +01:00
parent fd04967676
commit 965a70e38d
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GPG key ID: 7F3CEA63AE251B69
2 changed files with 125 additions and 37 deletions
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148
src/json.hpp
View file

@ -6189,48 +6189,61 @@ class binary_writer
}
/*!
@brief[in] j JSON value to serialize
@param[in] j JSON value to serialize
@param[in] use_count whether to use '#' prefixes (optimized format)
@param[in] use_type whether to use '$' prefixes (optimized format)
@param[in] add_prefix whether prefixes need to be used for this value
*/
void write_ubjson(const BasicJsonType& j, const bool use_count = false)
void write_ubjson(const BasicJsonType& j,
const bool use_count = false,
const bool use_type = false,
const bool add_prefix = true)
{
switch (j.type())
{
case value_t::null:
{
oa->write_character(static_cast<CharType>('Z'));
if (add_prefix)
{
oa->write_character(static_cast<CharType>('Z'));
}
break;
}
case value_t::boolean:
{
oa->write_character(j.m_value.boolean
? static_cast<CharType>('T')
: static_cast<CharType>('F'));
if (add_prefix)
oa->write_character(j.m_value.boolean
? static_cast<CharType>('T')
: static_cast<CharType>('F'));
break;
}
case value_t::number_integer:
{
write_number_with_ubjson_prefix(j.m_value.number_integer);
write_number_with_ubjson_prefix(j.m_value.number_integer, add_prefix);
break;
}
case value_t::number_unsigned:
{
write_number_with_ubjson_prefix(j.m_value.number_unsigned);
write_number_with_ubjson_prefix(j.m_value.number_unsigned, add_prefix);
break;
}
case value_t::number_float:
{
write_number_with_ubjson_prefix(j.m_value.number_float);
write_number_with_ubjson_prefix(j.m_value.number_float, add_prefix);
break;
}
case value_t::string:
{
oa->write_character(static_cast<CharType>('S'));
write_number_with_ubjson_prefix(j.m_value.string->size());
if (add_prefix)
{
oa->write_character(static_cast<CharType>('S'));
}
write_number_with_ubjson_prefix(j.m_value.string->size(), true);
oa->write_characters(
reinterpret_cast<const CharType*>(j.m_value.string->c_str()),
j.m_value.string->size());
@ -6239,17 +6252,38 @@ class binary_writer
case value_t::array:
{
oa->write_character(static_cast<CharType>('['));
if (add_prefix)
{
oa->write_character(static_cast<CharType>('['));
}
bool prefix_required = true;
if (use_type and not j.m_value.array->empty())
{
const char first_prefix = ubjson_prefix(j.front());
const bool same_prefix = std::all_of(j.begin() + 1, j.end(),
[this, first_prefix](const BasicJsonType & v)
{
return ubjson_prefix(v) == first_prefix;
});
if (same_prefix)
{
prefix_required = false;
oa->write_character(static_cast<CharType>('$'));
oa->write_character(static_cast<CharType>(first_prefix));
}
}
if (use_count)
{
oa->write_character(static_cast<CharType>('#'));
write_number_with_ubjson_prefix(j.m_value.array->size());
write_number_with_ubjson_prefix(j.m_value.array->size(), true);
}
for (const auto& el : *j.m_value.array)
{
write_ubjson(el, use_count);
write_ubjson(el, use_count, use_type, prefix_required);
}
if (not use_count)
@ -6262,21 +6296,42 @@ class binary_writer
case value_t::object:
{
oa->write_character(static_cast<CharType>('{'));
if (add_prefix)
{
oa->write_character(static_cast<CharType>('{'));
}
bool prefix_required = true;
if (use_type and not j.m_value.object->empty())
{
const char first_prefix = ubjson_prefix(j.front());
const bool same_prefix = std::all_of(j.begin(), j.end(),
[this, first_prefix](const BasicJsonType & v)
{
return ubjson_prefix(v) == first_prefix;
});
if (same_prefix)
{
prefix_required = false;
oa->write_character(static_cast<CharType>('$'));
oa->write_character(static_cast<CharType>(first_prefix));
}
}
if (use_count)
{
oa->write_character(static_cast<CharType>('#'));
write_number_with_ubjson_prefix(j.m_value.object->size());
write_number_with_ubjson_prefix(j.m_value.object->size(), true);
}
for (const auto& el : *j.m_value.object)
{
write_number_with_ubjson_prefix(el.first.size());
write_number_with_ubjson_prefix(el.first.size(), true);
oa->write_characters(
reinterpret_cast<const CharType*>(el.first.c_str()),
el.first.size());
write_ubjson(el.second, use_count);
write_ubjson(el.second, use_count, use_type, prefix_required);
}
if (not use_count)
@ -6320,38 +6375,56 @@ class binary_writer
}
template<typename NumberType>
void write_number_with_ubjson_prefix(const NumberType n)
void write_number_with_ubjson_prefix(const NumberType n, const bool add_prefix)
{
if (std::is_floating_point<NumberType>::value)
{
oa->write_character(static_cast<CharType>('D')); // float64
if (add_prefix)
{
oa->write_character(static_cast<CharType>('D')); // float64
}
write_number(n);
}
else if (std::is_unsigned<NumberType>::value)
{
if (n <= (std::numeric_limits<int8_t>::max)())
{
oa->write_character(static_cast<CharType>('i')); // uint8
if (add_prefix)
{
oa->write_character(static_cast<CharType>('i')); // uint8
}
write_number(static_cast<uint8_t>(n));
}
else if (n <= (std::numeric_limits<uint8_t>::max)())
{
oa->write_character(static_cast<CharType>('U')); // uint8
if (add_prefix)
{
oa->write_character(static_cast<CharType>('U')); // uint8
}
write_number(static_cast<uint8_t>(n));
}
else if (n <= (std::numeric_limits<int16_t>::max)())
{
oa->write_character(static_cast<CharType>('I')); // int16
if (add_prefix)
{
oa->write_character(static_cast<CharType>('I')); // int16
}
write_number(static_cast<int16_t>(n));
}
else if (n <= (std::numeric_limits<int32_t>::max)())
{
oa->write_character(static_cast<CharType>('l')); // int32
if (add_prefix)
{
oa->write_character(static_cast<CharType>('l')); // int32
}
write_number(static_cast<int32_t>(n));
}
else if (n <= (std::numeric_limits<int64_t>::max)())
{
oa->write_character(static_cast<CharType>('L')); // int64
if (add_prefix)
{
oa->write_character(static_cast<CharType>('L')); // int64
}
write_number(static_cast<int64_t>(n));
}
else
@ -6364,27 +6437,42 @@ class binary_writer
{
if ((std::numeric_limits<int8_t>::min)() <= n and n <= (std::numeric_limits<int8_t>::max)())
{
oa->write_character(static_cast<CharType>('i')); // int8
if (add_prefix)
{
oa->write_character(static_cast<CharType>('i')); // int8
}
write_number(static_cast<int8_t>(n));
}
else if ((std::numeric_limits<uint8_t>::min)() <= n and n <= (std::numeric_limits<uint8_t>::max)())
{
oa->write_character(static_cast<CharType>('U')); // uint8
if (add_prefix)
{
oa->write_character(static_cast<CharType>('U')); // uint8
}
write_number(static_cast<uint8_t>(n));
}
else if ((std::numeric_limits<int16_t>::min)() <= n and n <= (std::numeric_limits<int16_t>::max)())
{
oa->write_character(static_cast<CharType>('I')); // int16
if (add_prefix)
{
oa->write_character(static_cast<CharType>('I')); // int16
}
write_number(static_cast<int16_t>(n));
}
else if ((std::numeric_limits<int32_t>::min)() <= n and n <= (std::numeric_limits<int32_t>::max)())
{
oa->write_character(static_cast<CharType>('l')); // int32
if (add_prefix)
{
oa->write_character(static_cast<CharType>('l')); // int32
}
write_number(static_cast<int32_t>(n));
}
else if ((std::numeric_limits<int64_t>::min)() <= n and n <= (std::numeric_limits<int64_t>::max)())
{
oa->write_character(static_cast<CharType>('L')); // int64
if (add_prefix)
{
oa->write_character(static_cast<CharType>('L')); // int64
}
write_number(static_cast<int64_t>(n));
}
else

14
test/src/unit-ubjson.cpp
View file

@ -129,13 +129,13 @@ TEST_CASE("UBJSON")
// check individual bytes
CHECK(result[0] == 'L');
int64_t restored = (static_cast<int64_t>(result[1]) << 070) +
(static_cast<int64_t>(result[2]) << 060) +
(static_cast<int64_t>(result[3]) << 050) +
(static_cast<int64_t>(result[4]) << 040) +
(static_cast<int64_t>(result[5]) << 030) +
(static_cast<int64_t>(result[6]) << 020) +
(static_cast<int64_t>(result[7]) << 010) +
static_cast<int64_t>(result[8]);
(static_cast<int64_t>(result[2]) << 060) +
(static_cast<int64_t>(result[3]) << 050) +
(static_cast<int64_t>(result[4]) << 040) +
(static_cast<int64_t>(result[5]) << 030) +
(static_cast<int64_t>(result[6]) << 020) +
(static_cast<int64_t>(result[7]) << 010) +
static_cast<int64_t>(result[8]);
CHECK(restored == i);
// roundtrip