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routing class working version
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ipknHama
parent
5e5d696884
commit
d533a619c9
110
routing.h
110
routing.h
@ -1,6 +1,9 @@
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#pragma once
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#include <cstdint>
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#include <utility>
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#include <string>
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#include <tuple>
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#include "utility.h"
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@ -8,32 +11,121 @@ namespace flask
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{
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namespace black_magic
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{
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constexpr bool is_equ_n(StrWrap a, int ai, StrWrap b, int bi, int n)
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constexpr bool is_equ_n(const_str a, int ai, const_str b, int bi, int n)
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{
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return n == 0 ? true : a[ai] != b[bi] ? false : is_equ_n(a,ai+1,b,bi+1,n-1);
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return
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ai + n > a.size() || bi + n > b.size()
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? false :
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n == 0
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? true :
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a[ai] != b[bi]
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? false :
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is_equ_n(a,ai+1,b,bi+1,n-1);
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}
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constexpr bool is_int(StrWrap s, int i)
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constexpr bool is_int(const_str s, int i)
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{
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return is_equ_n(s, i, "<int>", 0, 5);
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}
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constexpr bool is_str(StrWrap s, int i)
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constexpr bool is_float(const_str s, int i)
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{
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return is_equ_n(s, i, "<float>", 0, 7) ||
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is_equ_n(s, i, "<double>", 0, 8);
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}
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constexpr bool is_str(const_str s, int i)
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{
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return is_equ_n(s, i, "<str>", 0, 5);
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}
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//constexpr ? parse_route(StrWrap s)
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//{
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//return
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//}
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constexpr bool is_path(const_str s, int i)
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{
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return is_equ_n(s, i, "<path>", 0, 6);
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}
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template <typename ...Args>
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struct Caller
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{
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template <typename F>
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void operator()(F f, Args... args)
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{
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f(args...);
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}
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};
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template <int N, typename ... Args> struct S;
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template <int N, typename Arg, typename ... Args> struct S<N, Arg, Args...> {
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static_assert(N <= 4+1, "too many routing arguments (maximum 5)");
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template <typename T>
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using push = typename std::conditional<(N>4), S<N, Arg, Args...>, S<N+1, Arg, Args..., T>>::type;
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using pop = S<N-1, Args...>;
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};
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template <> struct S<0>
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{
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template <typename T>
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using push = S<1, T>;
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};
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template <typename F, typename Set>
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struct CallHelper;
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template <typename F, int N, typename ...Args>
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struct CallHelper<F, S<N, Args...>>
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{
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template <typename F1, typename ...Args1, typename =
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decltype(std::declval<F1>()(std::declval<Args1>()...))
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>
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static char __test(int);
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template <typename ...>
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static int __test(...);
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static constexpr bool value = sizeof(__test<F, Args...>(0)) == sizeof(char);
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};
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static_assert(CallHelper<void(), S<0>>::value, "");
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static_assert(CallHelper<void(int), S<1, int>>::value, "");
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static_assert(!CallHelper<void(int), S<0>>::value, "");
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static_assert(!CallHelper<void(int), S<2, int, int>>::value, "");
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template <typename F,
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typename Set = S<0>>
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constexpr bool validate_helper(const_str rule, unsigned i=0)
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{
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return
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i == rule.size()
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? CallHelper<F, Set>::value :
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is_int(rule, i)
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? validate_helper<F, typename Set::template push<int>>(rule, find_closing_tag(rule, i+1)+1) :
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is_float(rule, i)
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? validate_helper<F, typename Set::template push<double>>(rule, find_closing_tag(rule, i+1)+1) :
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is_str(rule, i)
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? validate_helper<F, typename Set::template push<std::string>>(rule, find_closing_tag(rule, i+1)+1) :
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is_path(rule, i)
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? validate_helper<F, typename Set::template push<std::string>>(rule, find_closing_tag(rule, i+1)+1) :
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validate_helper<F, Set>(rule, i+1)
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;
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}
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static_assert(validate_helper<void()>("/"),"");
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static_assert(validate_helper<void(int)>("/<int>"),"");
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static_assert(!validate_helper<void()>("/<int>"),"");
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}
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class Router
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{
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public:
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constexpr Router(black_magic::StrWrap s)
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constexpr Router(black_magic::const_str rule) : rule(rule)
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{
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}
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template <typename F>
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constexpr bool validate() const
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{
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return black_magic::validate_helper<F>(rule);
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}
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private:
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black_magic::const_str rule;
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};
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}
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23
unittest.cpp
23
unittest.cpp
@ -5,23 +5,36 @@
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using namespace flask;
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using namespace flask::black_magic;
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template <int N> struct T{};
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template <int N> struct ThrowTest{};
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int main()
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{
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try
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{
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throw T<is_int("1<int>22",0)>();
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throw ThrowTest<is_int("1<int>22",0)>();
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}
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catch(T<0>)
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catch(ThrowTest<0>)
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{
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}
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try
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{
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throw T<is_int("1<int>22",1)>();
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throw ThrowTest<is_int("1<int>22",1)>();
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}
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catch(T<1>)
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catch(ThrowTest<1>)
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{
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}
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{
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constexpr Router r = Router("/");
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static_assert(r.validate<void()>(), "Good handler");
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static_assert(!r.validate<void(int)>(), "Bad handler - no int argument");
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}
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{
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constexpr Router r = Router("/blog/<int>");
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static_assert(!r.validate<void()>(), "Bad handler - need argument");
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static_assert(r.validate<void(int)>(), "Good handler");
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static_assert(!r.validate<void(std::string)>(), "Bad handler - int is not convertible to std::string");
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static_assert(r.validate<void(double)>(), "Acceptable handler - int will be converted to double");
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}
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}
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15
utility.h
15
utility.h
@ -14,37 +14,36 @@ namespace flask
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}
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// from http://akrzemi1.wordpress.com/2011/05/11/parsing-strings-at-compile-time-part-i/
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class StrWrap
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class const_str
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{
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const char * const begin_;
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unsigned size_;
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public:
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template< unsigned N >
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constexpr StrWrap( const char(&arr)[N] ) : begin_(arr), size_(N - 1) {
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constexpr const_str( const char(&arr)[N] ) : begin_(arr), size_(N - 1) {
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static_assert( N >= 1, "not a string literal");
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}
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constexpr char operator[]( unsigned i ) {
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constexpr char operator[]( unsigned i ) const {
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return requires_in_range(i, size_), begin_[i];
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}
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constexpr operator const char *() {
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constexpr operator const char *() const {
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return begin_;
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}
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constexpr unsigned size() {
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constexpr unsigned size() const {
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return size_;
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}
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};
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constexpr int find_closing_tag(StrWrap s, std::size_t p)
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constexpr unsigned find_closing_tag(const_str s, unsigned p)
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{
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return s[p] == '>' ? p : find_closing_tag(s, p+1);
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}
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constexpr int count(StrWrap s, int i=0)
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constexpr int count(const_str s, int i=0)
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{
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return i == s.size() ? 0 : s[i] == '<' ? 1+count(s,i+1) : count(s,i+1);
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}
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