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#include <cerrno>
#include <limits> // numeric_limits
#include <utility> // move()
#include <cassert>
#include <cstdlib> // strto*()
#include <type_traits> // enable_if, is_*
#include <cstring> // strlen()
namespace butl
{
namespace json
{
inline invalid_json_input::
invalid_json_input (std::string n,
std::uint64_t l,
std::uint64_t c,
std::uint64_t p,
const std::string& d)
: invalid_json_input (move (n), l, c, p, d.c_str ())
{
}
inline invalid_json_input::
invalid_json_input (std::string n,
std::uint64_t l,
std::uint64_t c,
std::uint64_t p,
const char* d)
: invalid_argument (d),
name (std::move (n)),
line (l), column (c), position (p)
{
}
inline parser::
parser (std::istream& is,
const std::string& n,
bool mv,
const char* sep) noexcept
: parser (is, n.c_str (), mv, sep)
{
}
inline parser::
parser (const void* t,
std::size_t s,
const std::string& n,
bool mv,
const char* sep) noexcept
: parser (t, s, n.c_str (), mv, sep)
{
}
inline parser::
parser (const std::string& t,
const std::string& n,
bool mv,
const char* sep) noexcept
: parser (t.data (), t.size (), n.c_str (), mv, sep)
{
}
inline parser::
parser (const std::string& t,
const char* n,
bool mv,
const char* sep) noexcept
: parser (t.data (), t.size (), n, mv, sep)
{
}
inline parser::
parser (const char* t,
const std::string& n,
bool mv,
const char* sep) noexcept
: parser (t, std::strlen (t), n.c_str (), mv, sep)
{
}
inline parser::
parser (const char* t,
const char* n,
bool mv,
const char* sep) noexcept
: parser (t, std::strlen (t), n, mv, sep)
{
}
inline const std::string& parser::
name ()
{
if (!name_p_)
{
assert (parsed_ && !peeked_ && !value_p_);
cache_parsed_data ();
assert (name_p_);
}
return name_;
}
inline std::string& parser::
value ()
{
if (!value_p_)
{
assert (parsed_ && !peeked_ && !name_p_);
cache_parsed_data ();
assert (value_p_);
}
return value_;
}
// Note: one day we will be able to use C++17 from_chars() which was made
// exactly for this.
//
template <typename T>
inline typename std::enable_if<std::is_same<T, bool>::value, T>::type
parse_value (const char* b, size_t, const parser&)
{
return *b == 't';
}
template <typename T>
inline typename std::enable_if<
std::is_integral<T>::value &&
std::is_signed<T>::value &&
!std::is_same<T, bool>::value, T>::type
parse_value (const char* b, size_t n, const parser& p)
{
char* e (nullptr);
errno = 0; // We must clear it according to POSIX.
std::int64_t v (strtoll (b, &e, 10)); // Can't throw.
if (e == b || e != b + n || errno == ERANGE ||
v < std::numeric_limits<T>::min () ||
v > std::numeric_limits<T>::max ())
p.throw_invalid_value ("signed integer", b, n);
return static_cast<T> (v);
}
template <typename T>
inline typename std::enable_if<
std::is_integral<T>::value &&
std::is_unsigned<T>::value &&
!std::is_same<T, bool>::value, T>::type
parse_value (const char* b, size_t n, const parser& p)
{
char* e (nullptr);
errno = 0; // We must clear it according to POSIX.
std::uint64_t v (strtoull (b, &e, 10)); // Can't throw.
if (e == b || e != b + n || errno == ERANGE ||
v > std::numeric_limits<T>::max ())
p.throw_invalid_value ("unsigned integer", b, n);
return static_cast<T> (v);
}
template <typename T>
inline typename std::enable_if<std::is_same<T, float>::value, T>::type
parse_value (const char* b, size_t n, const parser& p)
{
char* e (nullptr);
errno = 0; // We must clear it according to POSIX.
T r (std::strtof (b, &e));
if (e == b || e != b + n || errno == ERANGE)
p.throw_invalid_value ("float", b, n);
return r;
}
template <typename T>
inline typename std::enable_if<std::is_same<T, double>::value, T>::type
parse_value (const char* b, size_t n, const parser& p)
{
char* e (nullptr);
errno = 0; // We must clear it according to POSIX.
T r (std::strtod (b, &e));
if (e == b || e != b + n || errno == ERANGE)
p.throw_invalid_value ("double", b, n);
return r;
}
template <typename T>
inline typename std::enable_if<std::is_same<T, long double>::value, T>::type
parse_value (const char* b, size_t n, const parser& p)
{
char* e (nullptr);
errno = 0; // We must clear it according to POSIX.
T r (std::strtold (b, &e));
if (e == b || e != b + n || errno == ERANGE)
p.throw_invalid_value ("long double", b, n);
return r;
}
template <typename T>
inline T parser::
value () const
{
if (!value_p_)
{
assert (parsed_ && !peeked_ && value_event (translate (*parsed_)));
return parse_value<T> (raw_s_, raw_n_, *this);
}
return parse_value<T> (value_.data (), value_.size (), *this);
}
}
}
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