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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** lpTsz, int iFlags);
int Plx(const char* szMod, const char* szPred);
struct Query
{
Query(module_t ctx, predicate_t p, term_t t0);
~Query(void);
int Cut(void);
int Close(void);
int NextSolution(void);
private:
qid_t m_q;
};
/* Polymorphic aliases for PL_put_*, PL_get_*. */
inline int PlPut(const term_t t, const int x) { return PL_put_integer(t, x); }
inline int PlPut(const term_t t, const long x) { return PL_put_integer(t, x); }
inline int PlPut(const term_t t, const long long x) { return PL_put_integer(t, x); }
inline int PlPut(const term_t t, const atom_t x) { return PL_put_atom(t, x); }
inline int PlPut(const term_t t, char* const x) { return PL_put_atom(t, PL_new_atom(x)); }
inline int PlPut(const term_t t, const char* const x) { return PL_put_atom(t, PL_new_atom(x)); }
inline int PlPut(const term_t t, wchar_t* const x) { return PL_put_atom(t, PL_new_atom_wchars(-1, x)); }
inline int PlPut(const term_t t, const wchar_t* const x) { return PL_put_atom(t, PL_new_atom_wchars(-1, x)); }
inline int PlPut(const term_t, int* const) { return -1; }
inline int PlPut(const term_t, long* const) { return -1; }
inline int PlPut(const term_t, long long* const) { return -1; }
inline int PlPut(const term_t, atom_t* const) { return -1; }
inline int PlPut(const term_t, char** const) { return -1; }
inline int PlPut(const term_t, wchar_t** const) { return -1; }
inline int PlGet(const term_t, const int) { return -1; }
inline int PlGet(const term_t, const long) { return -1; }
inline int PlGet(const term_t, const long long) { return -1; }
inline int PlGet(const term_t, const atom_t) { return -1; }
inline int PlGet(const term_t, char* const) { return -1; }
inline int PlGet(const term_t, const char* const) { return -1; }
inline int PlGet(const term_t t, int* const x) { return PL_get_integer(t, x); }
inline int PlGet(const term_t t, long* const x) { return PL_get_long(t, x); }
inline int PlGet(const term_t t, long long* const x) { return PL_get_int64(t, x); }
inline int PlGet(const term_t t, atom_t* const x) { return PL_get_atom(t, x); }
inline int PlGet(const term_t t, char** const x) { return PL_get_atom_chars(t, x); }
inline int PlGet(const term_t t, wchar_t** const x)
{
atom_t a;
size_t len;
if (!PL_get_atom(t, &a)) return 0;
*x = (wchar_t*)PL_atom_wchars(a, &len);
return *x != NULL;
}
/* Helper templates for Plx, Pl. */
template <typename T>
int PlPutv(const term_t t, T arg) { return PlPut(t, arg); }
template <typename T, typename ...R>
int PlPutv(const term_t t, T arg, R... rest) { return PlPut(t, arg)? PlPutv(t+1, rest...): 0; }
template <typename T>
int PlGetv(const term_t t, T arg) { return PlGet(t, arg); }
template <typename T, typename ...R>
int PlGetv(const term_t t, T arg, R... rest) { return PlGet(t, arg)? PlGetv(t+1, rest...): 0; }
template <typename T>
int Countv(const int i, T arg) { return i+1; }
template <typename T, typename ...R>
int Countv(const int i, T arg, R... rest) { return Countv(i+1, rest...); }
/* Call Prolog predicate, propagating Prolog exceptions. */
template <typename ...T>
int Plx(const char* const szMod, const char* const szPred, T... args)
{
const int iArity = Countv(0, args...);
const term_t t = PL_new_term_refs(iArity);
if (!PlPutv(t, args...)) return 0;
Query q(NULL, PL_predicate(szPred, iArity, szMod), t);
if (!q.NextSolution()) return 0;
if (!PlGetv(t, args...)) return 0;
return 1;
}
/* Call Prolog predicate, ignoring Prolog exceptions. */
inline int Pl(const char* const szMod, const char* const szPred)
{
try {
return Plx(szMod, szPred);
} catch (term_t& t) {
return 0;
}
}
template <typename ...T>
int Pl(const char* const szMod, const char* const szPred, T... args)
{
try {
return Plx(szMod, szPred, args...);
} catch (term_t& t) {
return 0;
}
}
#endif
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