mirror of
https://github.com/CrowCpp/Crow.git
synced 2024-06-07 21:10:44 +00:00
289 lines
7.8 KiB
C++
289 lines
7.8 KiB
C++
#pragma once
|
|
|
|
#include <cstdint>
|
|
#include <stdexcept>
|
|
#include <tuple>
|
|
#include <type_traits>
|
|
|
|
namespace crow
|
|
{
|
|
namespace black_magic
|
|
{
|
|
struct OutOfRange
|
|
{
|
|
OutOfRange(unsigned pos, unsigned length) {}
|
|
};
|
|
constexpr unsigned requires_in_range( unsigned i, unsigned len )
|
|
{
|
|
return i >= len ? throw OutOfRange(i, len) : i;
|
|
}
|
|
|
|
class const_str
|
|
{
|
|
const char * const begin_;
|
|
unsigned size_;
|
|
|
|
public:
|
|
template< unsigned N >
|
|
constexpr const_str( const char(&arr)[N] ) : begin_(arr), size_(N - 1) {
|
|
static_assert( N >= 1, "not a string literal");
|
|
}
|
|
constexpr char operator[]( unsigned i ) const {
|
|
return requires_in_range(i, size_), begin_[i];
|
|
}
|
|
|
|
constexpr operator const char *() const {
|
|
return begin_;
|
|
}
|
|
|
|
constexpr const char* begin() const { return begin_; }
|
|
constexpr const char* end() const { return begin_ + size_; }
|
|
|
|
constexpr unsigned size() const {
|
|
return size_;
|
|
}
|
|
};
|
|
|
|
|
|
constexpr unsigned find_closing_tag(const_str s, unsigned p)
|
|
{
|
|
return s[p] == '>' ? p : find_closing_tag(s, p+1);
|
|
}
|
|
|
|
constexpr bool is_valid(const_str s, unsigned i = 0, int f = 0)
|
|
{
|
|
return
|
|
i == s.size()
|
|
? f == 0 :
|
|
f < 0 || f >= 2
|
|
? false :
|
|
s[i] == '<'
|
|
? is_valid(s, i+1, f+1) :
|
|
s[i] == '>'
|
|
? is_valid(s, i+1, f-1) :
|
|
is_valid(s, i+1, f);
|
|
}
|
|
|
|
constexpr bool is_equ_p(const char* a, const char* b, unsigned n)
|
|
{
|
|
return
|
|
*a == 0 || *b == 0
|
|
? false :
|
|
n == 0
|
|
? true :
|
|
*a != *b
|
|
? false :
|
|
is_equ_p(a+1, b+1, n-1);
|
|
}
|
|
|
|
constexpr bool is_equ_n(const_str a, unsigned ai, const_str b, unsigned bi, unsigned n)
|
|
{
|
|
return
|
|
ai + n > a.size() || bi + n > b.size()
|
|
? false :
|
|
n == 0
|
|
? true :
|
|
a[ai] != b[bi]
|
|
? false :
|
|
is_equ_n(a,ai+1,b,bi+1,n-1);
|
|
}
|
|
|
|
constexpr bool is_int(const_str s, unsigned i)
|
|
{
|
|
return is_equ_n(s, i, "<int>", 0, 5);
|
|
}
|
|
|
|
constexpr bool is_uint(const_str s, unsigned i)
|
|
{
|
|
return is_equ_n(s, i, "<uint>", 0, 6);
|
|
}
|
|
|
|
constexpr bool is_float(const_str s, unsigned i)
|
|
{
|
|
return is_equ_n(s, i, "<float>", 0, 7) ||
|
|
is_equ_n(s, i, "<double>", 0, 8);
|
|
}
|
|
|
|
constexpr bool is_str(const_str s, unsigned i)
|
|
{
|
|
return is_equ_n(s, i, "<str>", 0, 5) ||
|
|
is_equ_n(s, i, "<string>", 0, 8);
|
|
}
|
|
|
|
constexpr bool is_path(const_str s, unsigned i)
|
|
{
|
|
return is_equ_n(s, i, "<path>", 0, 6);
|
|
}
|
|
|
|
constexpr uint64_t get_parameter_tag(const_str s, unsigned p = 0)
|
|
{
|
|
return
|
|
p == s.size()
|
|
? 0 :
|
|
s[p] == '<' ? (
|
|
is_int(s, p)
|
|
? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 1 :
|
|
is_uint(s, p)
|
|
? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 2 :
|
|
is_float(s, p)
|
|
? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 3 :
|
|
is_str(s, p)
|
|
? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 4 :
|
|
is_path(s, p)
|
|
? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 5 :
|
|
throw std::runtime_error("invalid parameter type")
|
|
) :
|
|
get_parameter_tag(s, p+1);
|
|
}
|
|
|
|
template <typename ... T>
|
|
struct S
|
|
{
|
|
template <typename U>
|
|
using push = S<U, T...>;
|
|
template <typename U>
|
|
using push_back = S<T..., U>;
|
|
template <template<typename ... Args> class U>
|
|
using rebind = U<T...>;
|
|
};
|
|
template <typename F, typename Set>
|
|
struct CallHelper;
|
|
template <typename F, typename ...Args>
|
|
struct CallHelper<F, S<Args...>>
|
|
{
|
|
template <typename F1, typename ...Args1, typename =
|
|
decltype(std::declval<F1>()(std::declval<Args1>()...))
|
|
>
|
|
static char __test(int);
|
|
|
|
template <typename ...>
|
|
static int __test(...);
|
|
|
|
static constexpr bool value = sizeof(__test<F, Args...>(0)) == sizeof(char);
|
|
};
|
|
|
|
|
|
template <int N>
|
|
struct single_tag_to_type
|
|
{
|
|
};
|
|
|
|
template <>
|
|
struct single_tag_to_type<1>
|
|
{
|
|
using type = int64_t;
|
|
};
|
|
|
|
template <>
|
|
struct single_tag_to_type<2>
|
|
{
|
|
using type = uint64_t;
|
|
};
|
|
|
|
template <>
|
|
struct single_tag_to_type<3>
|
|
{
|
|
using type = double;
|
|
};
|
|
|
|
template <>
|
|
struct single_tag_to_type<4>
|
|
{
|
|
using type = std::string;
|
|
};
|
|
|
|
template <>
|
|
struct single_tag_to_type<5>
|
|
{
|
|
using type = std::string;
|
|
};
|
|
|
|
|
|
template <uint64_t Tag>
|
|
struct arguments
|
|
{
|
|
using subarguments = typename arguments<Tag/6>::type;
|
|
using type =
|
|
typename subarguments::template push<typename single_tag_to_type<Tag%6>::type>;
|
|
};
|
|
|
|
template <>
|
|
struct arguments<0>
|
|
{
|
|
using type = S<>;
|
|
};
|
|
|
|
template <typename ... T>
|
|
struct last_element_type
|
|
{
|
|
using type = typename std::tuple_element<sizeof...(T)-1, std::tuple<T...>>::type;
|
|
};
|
|
|
|
|
|
template <>
|
|
struct last_element_type<>
|
|
{
|
|
};
|
|
|
|
|
|
// from http://stackoverflow.com/questions/13072359/c11-compile-time-array-with-logarithmic-evaluation-depth
|
|
template<class T> using Invoke = typename T::type;
|
|
|
|
template<unsigned...> struct seq{ using type = seq; };
|
|
|
|
template<class S1, class S2> struct concat;
|
|
|
|
template<unsigned... I1, unsigned... I2>
|
|
struct concat<seq<I1...>, seq<I2...>>
|
|
: seq<I1..., (sizeof...(I1)+I2)...>{};
|
|
|
|
template<class S1, class S2>
|
|
using Concat = Invoke<concat<S1, S2>>;
|
|
|
|
template<unsigned N> struct gen_seq;
|
|
template<unsigned N> using GenSeq = Invoke<gen_seq<N>>;
|
|
|
|
template<unsigned N>
|
|
struct gen_seq : Concat<GenSeq<N/2>, GenSeq<N - N/2>>{};
|
|
|
|
template<> struct gen_seq<0> : seq<>{};
|
|
template<> struct gen_seq<1> : seq<0>{};
|
|
|
|
template <typename Seq, typename Tuple>
|
|
struct pop_back_helper;
|
|
|
|
template <unsigned ... N, typename Tuple>
|
|
struct pop_back_helper<seq<N...>, Tuple>
|
|
{
|
|
template <template <typename ... Args> class U>
|
|
using rebind = U<std::tuple_element<N, Tuple>...>;
|
|
};
|
|
|
|
template <typename ... T>
|
|
struct pop_back : public pop_back_helper<typename gen_seq<sizeof...(T)-1>::type, std::tuple<T...>>
|
|
{
|
|
};
|
|
|
|
template <>
|
|
struct pop_back<>
|
|
{
|
|
template <template <typename ... Args> class U>
|
|
using rebind = U<>;
|
|
};
|
|
|
|
// from http://stackoverflow.com/questions/2118541/check-if-c0x-parameter-pack-contains-a-type
|
|
template < typename Tp, typename... List >
|
|
struct contains : std::true_type {};
|
|
|
|
template < typename Tp, typename Head, typename... Rest >
|
|
struct contains<Tp, Head, Rest...>
|
|
: std::conditional< std::is_same<Tp, Head>::value,
|
|
std::true_type,
|
|
contains<Tp, Rest...>
|
|
>::type {};
|
|
|
|
template < typename Tp >
|
|
struct contains<Tp> : std::false_type {};
|
|
}
|
|
}
|