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yap-6.3/CXX/yapt.hh
2015-04-13 13:28:17 +01:00

262 lines
8.9 KiB
C++

#ifndef YAPT_HH
#define YAPT_HH 1
class YAPAtomTerm;
/**
* @brief Generic Prolog Term
*/
class YAPTerm {
friend class YAPPredicate;
friend class YAPPrologPredicate;
friend class YAPQuery;
friend class YAPModule;
friend class YAPModuleProp;
friend class YAPApplTerm;
protected:
yhandle_t t; /// handle to term, equivalent to term_t
void mk(Term t0); /// internal method to convert from term to handle
Term gt(); /// get handle and obtain term
public:
virtual ~YAPTerm() {};
YAPTerm(Term tn) { mk( tn ); } /// private method to convert from Term (internal YAP representation) to YAPTerm
// do nothing constructor
YAPTerm() { mk(TermNil); }
/// integer to term
YAPTerm(intptr_t i);
/// pointer to term
YAPTerm(void *ptr);
/// parse string s and construct a term.
YAPTerm(char *s) { Term tp ; mk( YAP_ReadBuffer(s,&tp) ); }
/// extract the tag of a term, after dereferencing.
YAP_tag_t tag();
/// copy the term ( term copy )
YAPTerm deepCopy();
inline Term term() { return gt(); } /// from YAPTerm to Term (internal YAP representation)
//const YAPTerm *vars();
/// this term is == to t1
bool exactlyEqual(YAPTerm t1);
bool unify(YAPTerm t1); /// t = t1
bool unifiable(YAPTerm t1); /// we can unify t and t1
bool variant(YAPTerm t1); /// t =@= t1, the two terms are equal up to variable renaming
intptr_t hashTerm(size_t sz, size_t depth, bool variant); /// term hash,
virtual bool isVar() { return IsVarTerm( gt() ); } /// type check for unbound
virtual bool isAtom() { return IsAtomTerm( gt() ); } /// type check for atom
virtual bool isInteger() { return IsIntegerTerm( gt() ); } /// type check for integer
virtual bool isFloat() { return IsFloatTerm( gt() ); } /// type check for floating-point
virtual bool isString() { return IsStringTerm( gt() ); } /// type check for a string " ... "
virtual bool isCompound() { return !(IsVarTerm( gt() ) || IsNumTerm( gt() )); } /// is a primitive term
virtual bool isAppl() { return IsApplTerm( gt() ); } /// is a structured term
virtual bool isPair() { return IsPairTerm( gt() ); } /// is a pair term
virtual bool isGround() { return Yap_IsGroundTerm( gt() ); } /// term is ground
virtual bool isList() { return Yap_IsListTerm( gt() ); } /// term is a list
/// extract the argument i of the term, where i in 1...arity
inline YAPTerm getArg(int i) {
BACKUP_MACHINE_REGS();
Term t0 = gt();
YAPTerm tf;
if (IsApplTerm(t0))
tf = YAPTerm(ArgOfTerm(i, t0));
else if (IsPairTerm(t0)) {
if (i==1)
tf = YAPTerm(HeadOfTerm(t0));
else if (i==2)
tf = YAPTerm(TailOfTerm(t0));
} else {
tf = YAPTerm((Term)0);
}
RECOVER_MACHINE_REGS();
REGS_LOG( "after getArg H= %p, i=%d", HR, tf.gt()) ;
return tf;
}
/// return a string with a textual representation of the term
virtual const char *text();
};
/**
* @brief Variable Term
*/
class YAPVarTerm: public YAPTerm {
YAPVarTerm(Term t) { if (IsVarTerm(t)) mk( t ); }
public:
/// constructor
YAPVarTerm();
/// get the internal representation
CELL *getVar() { return VarOfTerm( gt() ); }
/// is the variable bound to another one
bool unbound() { return IsUnboundVar(VarOfTerm( gt() )); }
virtual bool isVar() { return true; } /// type check for unbound
virtual bool isAtom() { return false; } /// type check for atom
virtual bool isInteger() { return false; } /// type check for integer
virtual bool isFloat() { return false; } /// type check for floating-point
virtual bool isString() { return false; } /// type check for a string " ... "
virtual bool isCompound() { return false; } /// is a primitive term
virtual bool isAppl() { return false; } /// is a structured term
virtual bool isPair() { return false; } /// is a pair term
virtual bool isGround() { return false; } /// term is ground
virtual bool isList() { return false; } /// term is a list
};
/**
* @brief Atom Term
* Term Representation of an Atom
*/
class YAPAtomTerm: public YAPTerm {
friend class YAPModule;
// Constructor: receives a C-atom;
YAPAtomTerm(Atom a) { mk( MkAtomTerm(a) ); }
YAPAtomTerm(Term t): YAPTerm(t) { IsAtomTerm(t); }
// Getter for Prolog atom
Term getTerm() { return t; }
public:
// Constructor: receives an atom;
YAPAtomTerm(YAPAtom a): YAPTerm() { mk( MkAtomTerm(a.a) ); }
// Constructor: receives a sequence of ISO-LATIN1 codes;
YAPAtomTerm(char *s) ;
// Constructor: receives a sequence of up to n ISO-LATIN1 codes;
YAPAtomTerm(char *s, size_t len);
// Constructor: receives a sequence of wchar_ts, whatever they may be;
YAPAtomTerm(wchar_t *s) ;
// Constructor: receives a sequence of n wchar_ts, whatever they may be;
YAPAtomTerm(wchar_t *s, size_t len);
virtual bool isVar() { return false; } /// type check for unbound
virtual bool isAtom() { return true; } /// type check for atom
virtual bool isInteger() { return false; } /// type check for integer
virtual bool isFloat() { return false; } /// type check for floating-point
virtual bool isString() { return false; } /// type check for a string " ... "
virtual bool isCompound() { return false; } /// is a primitive term
virtual bool isAppl() { return false; } /// is a structured term
virtual bool isPair() { return false; } /// is a pair term
virtual bool isGround() { return true; } /// term is ground
virtual bool isList() { return gt() == TermNil; } /// [] is a list
// Getter: outputs the atom;
YAPAtom getAtom() { return YAPAtom(AtomOfTerm( gt() )); }
// Getter: outputs the name as a sequence of ISO-LATIN1 codes;
const char *text() { return AtomOfTerm( gt() )->StrOfAE; }
};
/**
* @brief Compound Term
*/
class YAPApplTerm: public YAPTerm {
friend class YAPTerm;
YAPApplTerm(Term t0) { mk(t0); }
public:
~YAPApplTerm() { }
YAPApplTerm(YAPFunctor f, YAPTerm ts[]);
YAPApplTerm(YAPFunctor f);
YAPFunctor getFunctor();
YAPTerm getArg(int i);
virtual bool isVar() { return false; } /// type check for unbound
virtual bool isAtom() { return false; } /// type check for atom
virtual bool isInteger() { return false; } /// type check for integer
virtual bool isFloat() { return false; } /// type check for floating-point
virtual bool isString() { return false; } /// type check for a string " ... "
virtual bool isCompound() { return true; } /// is a primitive term
virtual bool isAppl() { return true; } /// is a structured term
virtual bool isPair() { return false; } /// is a pair term
virtual bool isGround() { return true; } /// term is ground
virtual bool isList() { return false; } /// [] is a list
};
/**
* @brief List Constructor Term
*/
class YAPPairTerm: public YAPTerm {
friend class YAPTerm;
YAPPairTerm(Term t0) { if (IsPairTerm(t0)) mk( t0 ); else mk(0); }
public:
YAPPairTerm(YAPTerm hd, YAPTerm tl);
YAPPairTerm();
YAPTerm getHead() { return YAPTerm(HeadOfTerm( gt() )); }
YAPTerm getTail() { return YAPTerm(TailOfTerm( gt() )); }
};
/**
* @brief Number Term
*/
class YAPNumberTerm: public YAPTerm {
public:
YAPNumberTerm() {};
bool isTagged() { return IsIntTerm( gt() ); }
};
/**
* @brief Integer Term
*/
class YAPIntegerTerm: public YAPNumberTerm {
public:
YAPIntegerTerm(intptr_t i);
intptr_t getInteger() { return IntegerOfTerm( gt() ); }
};
class YAPListTerm: public YAPTerm {
public:
/// Create a list term out of a standard term. Check if a valid operation.
///
/// @param[in] the term
YAPListTerm() { mk(TermNil); /* else type_error */ }
/// Create an empty list term.
///
/// @param[in] the term
YAPListTerm(Term t0) { mk(t0); /* else type_error */ }
/* /// Create a list term out of an array of terms.
///
/// @param[in] the array of terms
/// @param[in] the length of the array
YAPListTerm(YAPTerm ts[], size_t n);
*/
// YAPListTerm( vector<YAPTerm> v );
/// Return the number of elements in a list term.
size_t length() { Term *tailp; Term t1 = gt(); return Yap_SkipList(&t1, &tailp); }
/// Extract the first element of a list.
///
/// @param[in] the list
YAPTerm car();
/// Extract the tail elements of a list.
///
/// @param[in] the list
YAPListTerm cdr()
{
Term to = gt();
if (IsPairTerm( to ))
return YAPListTerm(TailOfTerm( to ));
else if ( to == TermNil)
return YAPListTerm( );
/* error */
throw YAPError::YAP_TYPE_ERROR;
}
/// Check if the list is empty.
///
/// @param[in] the list
inline bool nil() {
{ LOG( "II %x %x", gt(), TermNil) ; }
return gt() == TermNil;
}
;
};
/**
* @brief String Term
*/
class YAPStringTerm: public YAPTerm {
public:
/// your standard constructor
YAPStringTerm(char *s) ;
/// use this one to construct length limited strings
YAPStringTerm(char *s, size_t len);
/// construct using wide chars
YAPStringTerm(wchar_t *s) ;
/// construct using length-limited wide chars
YAPStringTerm(wchar_t *s, size_t len);
const char *getString() { return StringOfTerm( gt() ); }
};
#endif /* YAPT_HH */