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yap-6.3/CXX/yapdb.hh
Vitor Santos Costa 97aad19cd0 python vs modules
2017-06-15 22:40:55 +01:00

309 lines
8.2 KiB
C++

/// @file yapdb.hh
///
/// @brief C++ Interface to generated code.
#ifndef _YAPDB_H
#define _YAPDB_H
#define YAP_CPP_DB_INTERFACE 1
/**
*
* @defgroup yap-cplus-db-interface Data-Base Component of YAP interface.
*
* @ingroup yap-cplus-interface
* @{
* @tableofcontents
*
*
* These classes define the main data-structures stored to represent compiled
* programs:
*
* + YAPFunctor represents a name/arity combination.
*
* + YAPModule wraps the YAP module implementation.
*
* + YAPPredicate and subclasses store the actual program, Preliminary
* support covers Prolog and C-defined predicates.
*/
class YAPTerm;
class YAPAtomTerm;
class YAPError;
class YAPModule;
/**
* @brief YAPModule
* A YAPModule describes a bare module, which in YAP is just a name.
*
* Info about the module is in YAPModuleProp
*
*/
class X_API YAPModule : protected YAPAtomTerm {
friend class YAPPredicate;
friend class YAPModuleProp;
Term t() { return gt(); }
Term curModule() { CACHE_REGS return Yap_CurrentModule(); }
public:
YAPModule(YAP_Term t) : YAPAtomTerm(t){};
YAPModule() : YAPAtomTerm(curModule()){};
YAPModule(YAPAtom t) : YAPAtomTerm(t){};
Term term() { return gt(); };
};
/**
* @brief YAPModuleProp
* A YAPModuleProp controls access to a module property.
*
*/
class X_API YAPModuleProp : public YAPProp {
friend class YAPPredicate;
ModEntry *m;
YAPModuleProp(ModEntry *mod) { m = mod; };
YAPModuleProp(Term tmod) { m = Yap_GetModuleEntry(tmod); };
public:
YAPModuleProp(YAPModule tmod) { m = Yap_GetModuleEntry(tmod.gt()); };
YAPModuleProp() { CACHE_REGS m = Yap_GetModuleEntry(Yap_CurrentModule()); };
virtual YAPModule module() { return YAPModule(m->AtomOfME); };
};
/**
* @brief Predicates
*
* This class interfaces with PredEntry in Yatom.
*/
class X_API YAPPredicate : public YAPModuleProp {
friend class YAPQuery;
friend class YAPEngine;
protected:
PredEntry *ap;
/// auxiliary routine to find a predicate in the current module.
PredEntry *getPred(YAPTerm &t, Term *&outp);
PredEntry *asPred() { return ap; };
/// Empty constructor for predicates
///
/// Just do nothing.
inline YAPPredicate() {
}
/// String constructor for predicates
///
/// It also communicates the array of arguments t[]
/// and the array of variables
/// back to yapquery
YAPPredicate(const char *s0, Term &tout, Term &tnames) {
CACHE_REGS
Term *modp = NULL;
const unsigned char *us = (const unsigned char *)s0;
tnames = MkVarTerm();
tout =
Yap_BufferToTermWithPrioBindings(us, strlen(s0), TermNil, 1200, tnames);
// fprintf(stderr,"ap=%p arity=%d text=%s", ap, ap->ArityOfPE, s);
// Yap_DebugPlWrite(out);
if (tout == 0L) {
Yap_ThrowError(TYPE_ERROR_PREDICATE_INDICATOR, MkStringTerm(s0), "YAPPredicate");
}
YAPTerm tt = YAPTerm(tout);
ap = getPred(tt, modp);
}
/// Term constructor for predicates
///
/// It is just a call to getPred
inline YAPPredicate(Term t) {
CELL *v = NULL;
YAPTerm tt = YAPTerm(t);
ap = getPred(tt, v);
}
/// Term constructor for predicates
///
/// It is just a call to getPred
inline YAPPredicate(YAPTerm t) {
Term *v = nullptr;
ap = getPred(t, v);
}
/// Cast constructor for predicates,
/// if we have the implementation data.
///
inline YAPPredicate(PredEntry *pe) { ap = pe; }
/// Functor constructor for predicates, is given a specific module.
/// This version avoids manufacturing objects
inline YAPPredicate(Functor f, Term mod) {
ap = RepPredProp(PredPropByFunc(f, mod));
}
public:
/// Functor constructor for predicates
///
/// Asssumes that we use the current module.
YAPPredicate(YAPFunctor f) {
CACHE_REGS
ap = RepPredProp(PredPropByFunc(f.f, Yap_CurrentModule()));
}
/// Functor constructor for predicates, is given a specific module.
///
inline YAPPredicate(YAPFunctor f, YAPTerm mod) {
ap = RepPredProp(PredPropByFunc(f.f, mod.term()));
}
/// Name/arity constructor for predicates.
///
inline YAPPredicate(YAPAtom at, YAPTerm mod) {
ap = RepPredProp(PredPropByAtom(at.a, mod.term()));
}
/// Name/0 constructor for predicates.
///
YAPPredicate(YAPAtom at);
/// Mod:Name/Arity constructor for predicates.
///
inline YAPPredicate(YAPAtom at, uintptr_t arity, YAPModule mod) {
if (arity) {
Functor f = Yap_MkFunctor(at.a, arity);
ap = RepPredProp(PredPropByFunc(f, mod.term()));
} else {
ap = RepPredProp(PredPropByAtom(at.a, mod.term()));
}
}
/// Atom/Arity constructor for predicates.
///
YAPPredicate(YAPAtom at, uintptr_t arity);
/// char */module constructor for predicates.
///
inline YAPPredicate(const char *at, uintptr_t arity) {
ap = RepPredProp(PredPropByFunc(Yap_MkFunctor(Yap_LookupAtom(at), arity),
CurrentModule));
};
/// char */module constructor for predicates.
///
inline YAPPredicate(const char *at, uintptr_t arity, YAPTerm mod) {
ap = RepPredProp(
PredPropByFunc(Yap_MkFunctor(Yap_LookupAtom(at), arity), mod.term()));
};
/// char */module constructor for predicates.
///
inline YAPPredicate(const char *at, YAPTerm mod) {
ap = RepPredProp(PredPropByAtom(Yap_LookupAtom(at), mod.term()));
}
/// module of a predicate
///
/// notice that modules are currently treated as atoms, this should change.
YAPModule module() {
if (ap->ModuleOfPred == PROLOG_MODULE)
return YAPModule(AtomProlog);
else
return YAPModule(AtomOfTerm(ap->ModuleOfPred));
}
/// name of predicate
///
/// notice that we return the atom, not a string.
YAPAtom name() {
if (ap->ArityOfPE)
return YAPAtom((Atom)ap->FunctorOfPred);
else
return YAPAtom(NameOfFunctor(ap->FunctorOfPred));
}
/// functor of predicate
///
/// onlu defined if arity >= 1
YAPFunctor functor() {
if (ap->ArityOfPE)
return YAPFunctor(ap->FunctorOfPred);
Yap_ThrowError(DOMAIN_ERROR_OUT_OF_RANGE, MkIntTerm(0), "YAPFunctor::functor");
}
/// arity of predicate
///
/// we return a positive number.
uintptr_t getArity() { return ap->ArityOfPE; }
arity_t arity() { return ap->ArityOfPE; }
PredEntry *predEntry() { return ap; }
};
/**
* @brief PrologPredicate
*
* This class interfaces with Predicates Implemented in Prolog.
*/
class X_API YAPPrologPredicate : public YAPPredicate {
public:
YAPPrologPredicate(YAPTerm t) : YAPPredicate(t){};
YAPPrologPredicate(const char *s, arity_t arity) : YAPPredicate(s, arity){};
/// add a new clause
bool assertClause(YAPTerm clause, bool last = true,
YAPTerm source = YAPTerm());
/// add a new tuple
bool assertFact(YAPTerm *tuple, bool last = true);
/// retract at least the first clause matching the predicate.
void *retractClause(YAPTerm skeleton, bool all = false);
/// return the Nth clause (if source is available)
// YAPTerm clause(size_t index, YAPPredicate p) { return YAPTerm(); };
/// return the Nth clause (if source is available)
YAPTerm *nextClause() { return nullptr; };
};
/**
* @brief PrologPredicate
*
* This class interfaces with Predicates Implemented in Prolog.
*/
class X_API YAPFLIP : public YAPPredicate {
public:
YAPFLIP(CPredicate call, YAPAtom name, uintptr_t arity,
YAPModule module = YAPModule(), CPredicate retry = 0,
CPredicate cut = 0, size_t extra = 0, bool test = false)
: YAPPredicate(name, arity, module) {
if (retry) {
Yap_InitCPredBackCut(name.getName(), arity, extra, call, retry, cut,
UserCPredFlag);
} else {
if (test) {
YAP_UserCPredicate(name.getName(), call, arity);
} else {
YAP_UserCPredicate(name.getName(), call, arity);
}
}
};
YAPFLIP(const char *name, uintptr_t arity, YAPModule module = YAPModule(),
bool backtrackable = false)
: YAPPredicate(YAPAtom(name), arity, module) {
if (backtrackable) {
Yap_InitCPredBackCut(name, arity, 0, 0, 0, 0, UserCPredFlag);
} else {
YAP_UserCPredicate(name, 0, arity);
}
};
bool addCall(CPredicate call) { return Yap_AddCallToFli(ap, call); }
bool addRetry(CPredicate call) { return Yap_AddRetryToFli(ap, call); }
bool addCut(CPredicate call) { return Yap_AddCutToFli(ap, call); }
};
#endif
/// @}