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Merge pull request #1392 from mtalliance/feature/addFileInputAdapter

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Feature/add file input adapter
This commit is contained in:
Niels Lohmann 2018-12-16 22:10:03 +01:00 committed by GitHub
commit 5d390e91ff
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3 changed files with 83 additions and 2 deletions
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25
include/nlohmann/detail/input/input_adapters.hpp
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@ -10,6 +10,7 @@
#include <string> // string, char_traits
#include <type_traits> // enable_if, is_base_of, is_pointer, is_integral, remove_pointer
#include <utility> // pair, declval
#include <cstdio> //FILE *
#include <nlohmann/detail/macro_scope.hpp>
@ -45,6 +46,27 @@ struct input_adapter_protocol
/// a type to simplify interfaces
using input_adapter_t = std::shared_ptr<input_adapter_protocol>;
/*!
Input adapter for stdio file access. This adapter read only 1 byte and do not use any
buffer. This adapter is a very low level adapter.
*/
class file_input_adapter : public input_adapter_protocol
{
public:
explicit file_input_adapter(std::FILE* f) noexcept
: m_file(f)
{}
std::char_traits<char>::int_type get_character() noexcept override
{
return std::fgetc(m_file);
}
private:
/// the file pointer to read from
std::FILE* m_file;
};
/*!
Input adapter for a (caching) istream. Ignores a UFT Byte Order Mark at
beginning of input. Does not support changing the underlying std::streambuf
@ -293,7 +315,8 @@ class input_adapter
{
public:
// native support
input_adapter(std::FILE* file)
: ia(std::make_shared<file_input_adapter>(file)) {}
/// input adapter for input stream
input_adapter(std::istream& i)
: ia(std::make_shared<input_stream_adapter>(i)) {}

25
single_include/nlohmann/json.hpp
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@ -2058,6 +2058,7 @@ constexpr const auto& to_json = detail::static_const<detail::to_json_fn>::value;
#include <string> // string, char_traits
#include <type_traits> // enable_if, is_base_of, is_pointer, is_integral, remove_pointer
#include <utility> // pair, declval
#include <cstdio> //FILE *
// #include <nlohmann/detail/macro_scope.hpp>
@ -2094,6 +2095,27 @@ struct input_adapter_protocol
/// a type to simplify interfaces
using input_adapter_t = std::shared_ptr<input_adapter_protocol>;
/*!
Input adapter for stdio file access. This adapter read only 1 byte and do not use any
buffer. This adapter is a very low level adapter.
*/
class file_input_adapter : public input_adapter_protocol
{
public:
explicit file_input_adapter(std::FILE* f) noexcept
: m_file(f)
{}
std::char_traits<char>::int_type get_character() noexcept override
{
return std::fgetc(m_file);
}
private:
/// the file pointer to read from
std::FILE* m_file;
};
/*!
Input adapter for a (caching) istream. Ignores a UFT Byte Order Mark at
beginning of input. Does not support changing the underlying std::streambuf
@ -2342,7 +2364,8 @@ class input_adapter
{
public:
// native support
input_adapter(std::FILE* file)
: ia(std::make_shared<file_input_adapter>(file)) {}
/// input adapter for input stream
input_adapter(std::istream& i)
: ia(std::make_shared<input_stream_adapter>(i)) {}

35
test/src/unit-testsuites.cpp
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@ -384,6 +384,41 @@ TEST_CASE("json.org examples")
json j;
CHECK_NOTHROW(f >> j);
}
SECTION("FILE 1.json")
{
std::unique_ptr<std::FILE, decltype(&std::fclose)> f(std::fopen("test/data/json.org/1.json", "r"), &std::fclose);
json j;
CHECK_NOTHROW(j.parse(f.get()));
}
SECTION("FILE 2.json")
{
std::unique_ptr<std::FILE, decltype(&std::fclose)> f(std::fopen("test/data/json.org/2.json", "r"), &std::fclose);
json j;
CHECK_NOTHROW(j.parse(f.get()));
}
SECTION("FILE 3.json")
{
std::unique_ptr<std::FILE, decltype(&std::fclose)> f(std::fopen("test/data/json.org/3.json", "r"), &std::fclose);
json j;
CHECK_NOTHROW(j.parse(f.get()));
}
SECTION("FILE 4.json")
{
std::unique_ptr<std::FILE, decltype(&std::fclose)> f(std::fopen("test/data/json.org/4.json", "r"), &std::fclose);
json j;
CHECK_NOTHROW(j.parse(f.get()));
}
SECTION("FILE 5.json")
{
std::unique_ptr<std::FILE, decltype(&std::fclose)> f(std::fopen("test/data/json.org/5.json", "r"), &std::fclose);
json j;
CHECK_NOTHROW(j.parse(f.get()));
}
}
TEST_CASE("RFC 7159 examples")