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#ifndef PL_H
#define PL_H
#include <windows.h>
#include <SWI-Prolog.h>
int PL_get_tchars(term_t t, TCHAR** pTsz, int iFlags);
struct Frame
{
Frame();
~Frame();
void Close();
void Discard();
void Rewind();
private:
fid_t m_f;
};
struct Mark
{
Mark();
~Mark();
private:
buf_mark_t m_m;
};
struct Query
{
Query(module_t ctx, predicate_t p, term_t t0);
~Query();
int Cut();
int Close();
int NextSolution();
private:
qid_t m_q;
};
/* Polymorphic aliases for PL_put_*, PL_get_*. */
inline int PlPut(term_t t, int x) { return PL_put_integer(t, x); }
inline int PlPut(term_t t, long x) { return PL_put_integer(t, x); }
inline int PlPut(term_t t, long long x) { return PL_put_int64(t, x); }
inline int PlPut(term_t t, atom_t x) { return PL_put_atom(t, x); }
inline int PlPut(term_t t, char* x) { return PL_put_atom_chars(t, x); }
inline int PlPut(term_t t, const char* x) { return PL_put_atom_chars(t, x); }
inline int PlPut(term_t t, wchar_t* x) { return PL_unify_wchars(t, PL_ATOM, -1, x); }
inline int PlPut(term_t t, const wchar_t* x) { return PL_unify_wchars(t, PL_ATOM, -1, x); }
inline int PlPut(term_t, int*) { return -1; }
inline int PlPut(term_t, long*) { return -1; }
inline int PlPut(term_t, long long*) { return -1; }
inline int PlPut(term_t, atom_t*) { return -1; }
inline int PlPut(term_t, char**) { return -1; }
inline int PlPut(term_t, wchar_t**) { return -1; }
inline int PlGet(term_t, int) { return -1; }
inline int PlGet(term_t, long) { return -1; }
inline int PlGet(term_t, long long) { return -1; }
inline int PlGet(term_t, atom_t) { return -1; }
inline int PlGet(term_t, char*) { return -1; }
inline int PlGet(term_t, const char*) { return -1; }
inline int PlGet(term_t, wchar_t*) { return -1; }
inline int PlGet(term_t, const wchar_t*) { return -1; }
inline int PlGet(term_t t, int* x) { return PL_get_integer(t, x); }
inline int PlGet(term_t t, long* x) { return PL_get_long(t, x); }
inline int PlGet(term_t t, long long* x) { return PL_get_int64(t, x); }
inline int PlGet(term_t t, atom_t* x) { return PL_get_atom(t, x); }
inline int PlGet(term_t t, char** x) { return PL_get_atom_chars(t, x); }
inline int PlGet(term_t t, wchar_t** x) { size_t len; return PL_get_wchars(t, &len, x, CVT_ATOM); }
/* Put in or get from a term reference an arbitrary number of values,
* returning false if any value could not be put/got. */
template <typename = void>
inline bool PlPutN(term_t) { return true; }
template <typename T, typename... U>
inline bool PlPutN(term_t t, T x, U... xs) { return PlPut(t, x) && PlPutN(t+1, xs...); }
template <typename = void>
inline bool PlGetN(term_t) { return true; }
template <typename T, typename... U>
inline bool PlGetN(term_t t, T x, U... xs) { return PlGet(t, x) && PlGetN(t+1, xs...); }
/* Call Prolog predicate, propagating Prolog exceptions. */
template <typename... T>
int Plx(const char* const szMod, const char* const szPred, T... xs)
{
Frame f;
const term_t t = PL_new_term_refs(sizeof...(T));
if (!PlPutN(t, xs...)) return 0;
Query q(NULL, PL_predicate(szPred, sizeof...(T), szMod), t);
if (!q.NextSolution()) return 0;
if (!PlGetN(t, xs...)) return 0;
return 1;
}
/* Call Prolog predicate, ignoring Prolog exceptions. */
template <typename... T>
int Pl(const char* const szMod, const char* const szPred, T... xs)
{
try {
return Plx(szMod, szPred, xs...);
} catch (term_t& t) {
return 0;
}
}
#endif
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