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rowtype-yoga/purescript-native/pcc/include/purescript.hh
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1///////////////////////////////////////////////////////////////////////////////
2//
3// Module : purescript.hh
4// Copyright : (c) Andy Arvanitis 2015
5// License : MIT
6//
7// Maintainer : Andy Arvanitis <andy.arvanitis@gmail.com>
8// Stability : experimental
9// Portability :
10//
11// Basic types and functions to support purescript-to-C++1x rendering
12//
13///////////////////////////////////////////////////////////////////////////////
14//
15#ifndef PureScript_HH
16#define PureScript_HH
18// Standard includes
20#if defined(DEBUG)
21 #include <cassert>
22#else
23 #define NDEBUG
24 #undef assert
25 #define assert(x)
26#endif
28#include <functional>
29#include <string>
30#include <vector>
31#include <deque>
32#include <utility>
33#include <stdexcept>
34#include <iso646.h> // mostly for MS Visual Studio compiler
35#include "purescript_memory.hh"
37namespace PureScript {
39using integer = std::intptr_t;
40using cstring = const char *;
41using nullptr_t = std::nullptr_t;
43// Workaround for missing C++11 version in gcc
44class runtime_error : public std::runtime_error {
45public:
46 runtime_error(const char message[]) : std::runtime_error(std::string(message)) {}
47};
49const integer INTEGER_MIN = INTPTR_MIN;
50const integer INTEGER_MAX = INTPTR_MAX;
52const bool undefined = false;
53const size_t constructor = 0;
55// A variant data class designed to provide some features of dynamic typing.
56//
57class any {
59 public:
60 enum class Type {
61 Thunk = 0x10,
62 Integer,
63 Double,
64 Character,
65 Boolean,
66 StringLiteral,
67 Function,
68 EffFunction,
69 RawPointer,
70 String,
71 Map,
72 Data,
73 Array,
74 Closure,
75 EffClosure,
76 Pointer
77 };
79 private:
80 mutable Type type;
82 public:
83 struct as_thunk {
84 };
85 static constexpr as_thunk unthunk = as_thunk{};
87 using map_pair = std::pair<const char * const, const any>;
88 using map = std::vector<map_pair WITH_ALLOCATOR(map_pair)>;
89 using data = std::vector<any WITH_ALLOCATOR(any)>;
90 using array = std::deque<any WITH_ALLOCATOR(any)>;
91 using fn = auto (*)(const any&) -> any;
92 using eff_fn = auto (*)() -> any;
93 using thunk = auto (*)(const as_thunk) -> const any&;
95 private:
96 class closure {
97 public:
98 virtual auto operator()(const any&) const -> any = 0;
99 virtual ~closure() {}
100 };
102 template <typename T>
103 class _closure : public closure {
104 const T lambda;
105 public:
106 _closure(const T& l) noexcept : lambda(l) {}
107 auto operator()(const any& arg) const -> any override {
108 return lambda(arg);
109 }
110 };
112 class eff_closure {
113 public:
114 virtual auto operator()() const -> any = 0;
115 virtual ~eff_closure() {}
116 };
118 template <typename T>
119 class _eff_closure : public eff_closure {
120 const T lambda;
121 public:
122 _eff_closure(const T& l) noexcept : lambda(l) {}
123 auto operator()() const -> any override {
124 return lambda();
125 }
126 };
128 private:
129 union {
130 mutable thunk t;
131 mutable integer i;
132 mutable double d;
133 mutable char c;
134 mutable bool b;
135 mutable cstring r;
136 mutable fn f;
137 mutable eff_fn e;
138 mutable void * u;
139 mutable managed<std::string> s;
140 mutable managed<map> m;
141 mutable managed<data> v;
142 mutable managed<array> a;
143 mutable managed<closure> l;
144 mutable managed<eff_closure> k;
145 mutable managed<void> p;
146 };
148 public:
150 any(const integer val) noexcept : type(Type::Integer), i(val) {}
151 any(const int val) noexcept : type(Type::Integer), i(val) {}
152 any(const unsigned int val) noexcept : type(Type::Integer), i(val) {}
153 any(const double val) noexcept : type(Type::Double), d(val) {}
154 any(const char val) noexcept : type(Type::Character), c(val) {}
156 template <typename T, typename = typename std::enable_if<std::is_same<bool,T>::value>::type>
157 any(const T val) noexcept : type(Type::Boolean), b(val) {}
159 template <size_t N>
160 any(const char (&val)[N]) noexcept : type(Type::StringLiteral), r(val) {}
161 any(char * val) : type(Type::String), s(make_managed<std::string>(val)) {}
163 any(const std::string& val) : type(Type::String), s(make_managed<std::string>(val)) {}
164 any(std::string&& val) noexcept : type(Type::String), s(make_managed<std::string>(std::move(val))) {}
166 any(const managed<std::string>& val) noexcept : type(Type::String), s(val) {}
167 any(managed<std::string>&& val) noexcept : type(Type::String), s(std::move(val)) {}
169 any(const map& val) : type(Type::Map), m(make_managed<map>(val)) {}
170 any(map&& val) noexcept : type(Type::Map), m(make_managed<map>(std::move(val))) {}
172 any(const data& val) : type(Type::Data), v(make_managed<data>(val)) {}
173 any(data&& val) noexcept : type(Type::Data), v(make_managed<data>(std::move(val))) {}
175 any(const array& val) : type(Type::Array), a(make_managed<array>(val)) {}
176 any(array&& val) noexcept : type(Type::Array), a(make_managed<array>(std::move(val))) {}
178 template <typename T>
179 any(const T& val, typename std::enable_if<std::is_convertible<T,fn>::value>::type* = 0) noexcept
180 : type(Type::Function), f(val) {}
182 template <typename T, typename = typename std::enable_if<!std::is_same<any,T>::value &&
183 !std::is_convertible<T,fn>::value>::type>
184 any(const T& val, typename std::enable_if<std::is_assignable<std::function<any(const any&)>,T>::value>::type* = 0)
185 : type(Type::Closure), l(make_managed<_closure<T>>(val)) {}
187 template <typename T>
188 any(const T& val, typename std::enable_if<std::is_convertible<T,eff_fn>::value>::type* = 0) noexcept
189 : type(Type::EffFunction), e(val) {}
191 template <typename T,
192 typename = typename std::enable_if<!std::is_same<any,T>::value &&
193 !std::is_convertible<T,eff_fn>::value>::type>
194 any(const T& val, typename std::enable_if<std::is_assignable<std::function<any()>,T>::value>::type* = 0)
195 : type(Type::EffClosure), k(make_managed<_eff_closure<T>>(val)) {}
197 template <typename T>
198 any(const T& val, typename std::enable_if<std::is_convertible<T,thunk>::value>::type* = 0) noexcept
199 : type(Type::Thunk), t(val) {}
201 template <typename T,
202 typename = typename std::enable_if<std::is_class<typename std::remove_pointer<T>::type>::value>::type>
203 any(const T& val, typename std::enable_if<IS_POINTER_TYPE(T)::value>::type* = 0) noexcept
204 : type(Type::Pointer), p(val) {}
206 template <typename T>
207 any(T&& val, typename std::enable_if<std::is_assignable<managed<void>,T>::value>::type* = 0) noexcept
208 : type(Type::Pointer), p(std::move(val)) {}
210 // Explicit void* to raw pointer value
211 template <typename T>
212 any(const T& val, typename std::enable_if<std::is_same<T,void*>::value>::type* = 0) noexcept
213 : type(Type::RawPointer), u(val) {}
215 any(std::nullptr_t) noexcept : type(Type::Pointer), p(nullptr) {}
218#if !defined(USE_GC)
219 private:
220 template <typename T,
221 typename U,
222 typename = typename std::enable_if<!std::is_reference<T>::value>::type>
223 static constexpr auto move_if_rvalue(U&& u) noexcept -> U&& {
224 return static_cast<U&&>(u);
225 }
227 template <typename T,
228 typename U,
229 typename = typename std::enable_if<std::is_reference<T>::value>::type>
230 static constexpr auto move_if_rvalue(U& u) noexcept -> U& {
231 return static_cast<U&>(u);
232 }
234 template <typename T>
235 auto assign(T&& other) const noexcept -> void {
236 switch (other.type) {
237 case Type::Thunk: t = other.t; break;
238 case Type::Integer: i = other.i; break;
239 case Type::Double: d = other.d; break;
240 case Type::Character: c = other.c; break;
241 case Type::Boolean: b = other.b; break;
242 case Type::StringLiteral: r = other.r; break;
243 case Type::Function: f = other.f; break;
244 case Type::EffFunction: e = other.e; break;
245 case Type::RawPointer: u = other.u; break;
247 case Type::String: new (&s) managed<std::string>(move_if_rvalue<T>(other.s)); break;
248 case Type::Map: new (&m) managed<map>(move_if_rvalue<T>(other.m)); break;
249 case Type::Data: new (&v) managed<data>(move_if_rvalue<T>(other.v)); break;
250 case Type::Array: new (&a) managed<array>(move_if_rvalue<T>(other.a)); break;
251 case Type::Closure: new (&l) managed<closure>(move_if_rvalue<T>(other.l)); break;
252 case Type::EffClosure: new (&k) managed<eff_closure>(move_if_rvalue<T>(other.k)); break;
253 case Type::Pointer: new (&p) managed<void>(move_if_rvalue<T>(other.p)); break;
255 default: assert(false && "Bad 'any' type"); break;
256 }
257 }
259 auto destruct() -> void {
260 switch (type) {
261 case Type::String: s.~managed<std::string>(); break;
262 case Type::Map: m.~managed<map>(); break;
263 case Type::Data: v.~managed<data>(); break;
264 case Type::Array: a.~managed<array>(); break;
265 case Type::Closure: l.~managed<closure>(); break;
266 case Type::EffClosure: k.~managed<eff_closure>(); break;
267 case Type::Pointer: p.~managed<void>(); break;
269 default: break;
270 }
271 }
273 public:
274 any(const any& other) noexcept : type(other.type) {
275 assign(other);
276 }
278 any(any&& other) noexcept : type(other.type) {
279 assign(std::move(other));
280 }
282 auto operator=(const any& rhs) noexcept -> any& {
283 destruct();
284 type = rhs.type;
285 assign(rhs);
286 return *this;
287 }
289 auto operator=(any&& rhs) noexcept -> any& {
290 destruct();
291 type = rhs.type;
292 assign(std::move(rhs));
293 return *this;
294 }
296 ~any() {
297 destruct();
298 }
299#endif // !defined(USE_GC)
301 public:
302 any() = delete;
304 auto operator()(const any&) const -> any;
305 auto operator()(const as_thunk) const -> const any&;
306 auto operator()() const -> any;
308 operator integer() const;
309 operator double() const;
310 operator bool() const;
311 operator char() const;
312 operator cstring() const;
313 operator const map&() const;
314 operator const data&() const;
315 operator const array&() const;
317 auto operator[](const char[]) const -> const any&;
318 auto operator[](const size_t) const -> const any&;
319 auto operator[](const any&) const -> const any&;
321 auto contains(const char[]) const -> bool;
323 auto extractPointer() const -> void*;
325 auto rawPointer() const -> void* {
326 const any& variant = unthunkVariant(*this);
327 assert(type == Type::RawPointer);
328 return variant.u;
329 }
331 static auto unthunkVariant(const any&) -> const any&;
333 #define DEFINE_OPERATOR(op, ty, rty) \
334 inline friend auto operator op (const any& lhs, ty rhs) -> rty { \
335 return (ty)lhs op rhs; \
336 } \
337 inline friend auto operator op (ty lhs, const any& rhs) -> rty { \
338 return lhs op (ty)rhs; \
339 } \
341 #define DEFINE_INT_OPERATOR(op, rty) \
342 inline friend auto operator op (const any& lhs, int rhs) -> rty { \
343 return (integer)lhs op (integer)rhs; \
344 } \
345 inline friend auto operator op (int lhs, const any& rhs) -> rty { \
346 return (integer)lhs op (integer)rhs; \
347 }
349 #define DECLARE_COMPARISON_OPERATOR(op) \
350 friend auto operator op (const any&, const any&) -> bool; \
351 DEFINE_OPERATOR(op, integer, bool) \
352 DEFINE_OPERATOR(op, double, bool) \
353 DEFINE_OPERATOR(op, char, bool) \
354 DEFINE_INT_OPERATOR(op, bool) \
355 friend auto operator op (const any&, const char * const) -> bool; \
356 friend auto operator op (const char * const, const any&) -> bool;
358 DECLARE_COMPARISON_OPERATOR(==)
359 DECLARE_COMPARISON_OPERATOR(!=)
360 DECLARE_COMPARISON_OPERATOR(<)
361 DECLARE_COMPARISON_OPERATOR(<=)
362 DECLARE_COMPARISON_OPERATOR(>)
363 DECLARE_COMPARISON_OPERATOR(>=)
365 friend auto operator+(const any&, const any&) -> any;
367 DEFINE_OPERATOR(+, integer, integer)
368 DEFINE_OPERATOR(+, double, double)
369 DEFINE_OPERATOR(+, char, char)
370 DEFINE_INT_OPERATOR(+, integer)
371 friend auto operator+(const any& lhs, const char * const rhs) -> std::string;
372 friend auto operator+(const char * const lhs, const any& rhs) -> std::string;
374 friend auto operator-(const any&, const any&) -> any;
376 DEFINE_OPERATOR(-, integer, integer)
377 DEFINE_OPERATOR(-, double, double)
378 DEFINE_OPERATOR(-, char, char)
379 DEFINE_INT_OPERATOR(-, integer)
381 friend auto operator*(const any&, const any&) -> any;
383 DEFINE_OPERATOR(*, integer, integer)
384 DEFINE_OPERATOR(*, double, double)
385 DEFINE_OPERATOR(*, char, char)
386 DEFINE_INT_OPERATOR(*, integer)
388 friend auto operator/(const any&, const any&) -> any;
390 DEFINE_OPERATOR(/, integer, integer)
391 DEFINE_OPERATOR(/, double, double)
392 DEFINE_OPERATOR(/, char, char)
393 DEFINE_INT_OPERATOR(/, integer)
395 friend auto operator%(const any&, const any&) -> any;
397 DEFINE_OPERATOR(%, integer, integer)
398 DEFINE_OPERATOR(%, char, char)
399 DEFINE_INT_OPERATOR(%, integer)
401 friend auto operator-(const any&) -> any; // unary negate
402};
404template <typename T>
405inline auto cast(const any& a) ->
406 typename std::enable_if<std::is_arithmetic<T>::value ||
407 std::is_same<T,cstring>::value, T>::type {
408 return a;
411template <typename T>
412inline auto cast(const any& a) ->
413 typename std::enable_if<std::is_same<T, any::map>::value ||
414 std::is_same<T, any::data>::value ||
415 std::is_same<T, any::array>::value, const T&>::type {
416 return a;
419template <typename T, typename = typename std::enable_if<std::is_class<T>::value>::type>
420inline auto cast(const any& a) ->
421 typename std::enable_if<!std::is_same<T, any::map>::value &&
422 !std::is_same<T, any::data>::value &&
423 !std::is_same<T, any::array>::value, T&>::type {
424 return *static_cast<T*>(a.extractPointer());
427template <typename T>
428inline auto cast(const any& a) ->
429 typename std::enable_if<std::is_same<void*, T>::value, T>::type {
430 return a.rawPointer();
433} // namespace PureScript
435#undef WITH_ALLOCATOR
436#undef IS_POINTER_TYPE
437#undef DEFINE_OPERATOR
438#undef DEFINE_INT_OPERATOR
439#undef DECLARE_COMPARISON_OPERATOR
441#endif // PureScript_HH