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allowing parsing from contiguous containers

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Niels 2016-08-20 20:29:33 +02:00
parent 6f3554f040
commit eef8059003
3 changed files with 144 additions and 52 deletions
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51
src/json.hpp
View file

@ -5956,11 +5956,13 @@ class basic_json
@since version 1.0.0
*/
/*
static basic_json parse(const string_t& s,
const parser_callback_t cb = nullptr)
{
return parser(s, cb).parse();
}
*/
/*!
@brief deserialize from string literal
@ -6012,10 +6014,10 @@ class basic_json
}
/*!
@brief deserialize from a container with contiguous storage
@brief deserialize from a iterator range with contiguous storage
This function reads from a nonempty iterator range of a container with
contiguous storage of 1-byte values. Compatible container types include
This function reads from an iterator range of a container with contiguous
storage of 1-byte values. Compatible container types include
`std::vector`, `std::string`, `std::array`, `std::valarray`, and
`std::initializer_list`. Furthermore, C-style arrays can be used with
`std::begin()`/`std::end()`. User-defined containers can be used as long
@ -6025,9 +6027,7 @@ class basic_json
undefined behavior. **This precondition is enforced with an assertion.**
@pre Each element in the range has a size of 1 byte. Violating this
precondition yields undefined behavior. **This precondition is enforced
with an assertion.**
@pre The iterator range is nonempty. Violating this precondition yields
undefined behavior. **This precondition is enforced with an assertion.**
with a static assertion.**
@warning There is no way to enforce the preconditions at compile-time. If
the function is called with noncompliant iterators, the behavior
@ -6053,7 +6053,9 @@ class basic_json
*/
template <class IteratorType, typename
std::enable_if<
std::is_same<typename std::iterator_traits<IteratorType>::iterator_category, std::random_access_iterator_tag>::value
std::is_base_of<
std::random_access_iterator_tag,
typename std::iterator_traits<IteratorType>::iterator_category>::value
, int>::type
= 0>
static basic_json parse(IteratorType first, IteratorType last,
@ -6069,17 +6071,40 @@ class basic_json
}).first);
// assertion to check that each element is 1 byte long
assert(std::all_of(first, last, [](decltype(*first) val)
{
return sizeof(val) == 1;
}));
static_assert(sizeof(typename std::iterator_traits<IteratorType>::value_type) == 1,
"each element in the iterator range must have the size of 1 byte");
// assertion that the iterator range is not empty
assert(std::distance(first, last) > 0);
// if iterator range is empty, create a parser with an empty string
// to generate "unexpected EOF" error message
if (std::distance(first, last) <= 0)
{
return parser("").parse();
}
return parser(first, last, cb).parse();
}
template<class ContiguousContainer, typename
std::enable_if<
std::is_base_of<
std::random_access_iterator_tag,
typename std::iterator_traits<decltype(std::begin(std::declval<ContiguousContainer>()))>::iterator_category>::value
, int>::type = 0>
static basic_json parse(const ContiguousContainer& c,
const parser_callback_t cb = nullptr)
{
// delegate the call to the iterator-range parse overload
return parse(std::begin(c), std::end(c), cb);
}
template<class T, std::size_t N>
static basic_json parse(T (&array)[N],
const parser_callback_t cb = nullptr)
{
// delegate the call to the iterator-range parse overload
return parse(std::begin(array), std::end(array), cb);
}
/*!
@brief deserialize from stream

51
src/json.hpp.re2c
View file

@ -5956,11 +5956,13 @@ class basic_json
@since version 1.0.0
*/
/*
static basic_json parse(const string_t& s,
const parser_callback_t cb = nullptr)
{
return parser(s, cb).parse();
}
*/
/*!
@brief deserialize from string literal
@ -6012,10 +6014,10 @@ class basic_json
}
/*!
@brief deserialize from a container with contiguous storage
@brief deserialize from a iterator range with contiguous storage
This function reads from a nonempty iterator range of a container with
contiguous storage of 1-byte values. Compatible container types include
This function reads from an iterator range of a container with contiguous
storage of 1-byte values. Compatible container types include
`std::vector`, `std::string`, `std::array`, `std::valarray`, and
`std::initializer_list`. Furthermore, C-style arrays can be used with
`std::begin()`/`std::end()`. User-defined containers can be used as long
@ -6025,9 +6027,7 @@ class basic_json
undefined behavior. **This precondition is enforced with an assertion.**
@pre Each element in the range has a size of 1 byte. Violating this
precondition yields undefined behavior. **This precondition is enforced
with an assertion.**
@pre The iterator range is nonempty. Violating this precondition yields
undefined behavior. **This precondition is enforced with an assertion.**
with a static assertion.**
@warning There is no way to enforce the preconditions at compile-time. If
the function is called with noncompliant iterators, the behavior
@ -6053,7 +6053,9 @@ class basic_json
*/
template <class IteratorType, typename
std::enable_if<
std::is_same<typename std::iterator_traits<IteratorType>::iterator_category, std::random_access_iterator_tag>::value
std::is_base_of<
std::random_access_iterator_tag,
typename std::iterator_traits<IteratorType>::iterator_category>::value
, int>::type
= 0>
static basic_json parse(IteratorType first, IteratorType last,
@ -6069,17 +6071,40 @@ class basic_json
}).first);
// assertion to check that each element is 1 byte long
assert(std::all_of(first, last, [](decltype(*first) val)
{
return sizeof(val) == 1;
}));
static_assert(sizeof(typename std::iterator_traits<IteratorType>::value_type) == 1,
"each element in the iterator range must have the size of 1 byte");
// assertion that the iterator range is not empty
assert(std::distance(first, last) > 0);
// if iterator range is empty, create a parser with an empty string
// to generate "unexpected EOF" error message
if (std::distance(first, last) <= 0)
{
return parser("").parse();
}
return parser(first, last, cb).parse();
}
template<class ContiguousContainer, typename
std::enable_if<
std::is_base_of<
std::random_access_iterator_tag,
typename std::iterator_traits<decltype(std::begin(std::declval<ContiguousContainer>()))>::iterator_category>::value
, int>::type = 0>
static basic_json parse(const ContiguousContainer& c,
const parser_callback_t cb = nullptr)
{
// delegate the call to the iterator-range parse overload
return parse(std::begin(c), std::end(c), cb);
}
template<class T, std::size_t N>
static basic_json parse(T (&array)[N],
const parser_callback_t cb = nullptr)
{
// delegate the call to the iterator-range parse overload
return parse(std::begin(array), std::end(array), cb);
}
/*!
@brief deserialize from stream

42
test/src/unit-deserialization.cpp
View file

@ -81,6 +81,41 @@ TEST_CASE("deserialization")
}
SECTION("contiguous containers")
{
SECTION("directly")
{
SECTION("from std::vector")
{
std::vector<uint8_t> v = {'t', 'r', 'u', 'e', '\0'};
CHECK(json::parse(v) == json(true));
}
SECTION("from std::array")
{
std::array<uint8_t, 5> v { {'t', 'r', 'u', 'e', '\0'} };
CHECK(json::parse(v) == json(true));
}
SECTION("from array")
{
uint8_t v[] = {'t', 'r', 'u', 'e', '\0'};
CHECK(json::parse(v) == json(true));
}
SECTION("from std::string")
{
std::string v = {'t', 'r', 'u', 'e'};
CHECK(json::parse(v) == json(true));
}
SECTION("from std::initializer_list")
{
std::initializer_list<uint8_t> v = {'t', 'r', 'u', 'e', '\0'};
CHECK(json::parse(v) == json(true));
}
}
SECTION("via iterator range")
{
SECTION("from std::vector")
{
@ -117,5 +152,12 @@ TEST_CASE("deserialization")
std::valarray<uint8_t> v = {'t', 'r', 'u', 'e', '\0'};
CHECK(json::parse(std::begin(v), std::end(v)) == json(true));
}
SECTION("with empty range")
{
std::vector<uint8_t> v;
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), std::invalid_argument);
}
}
}
}