644 lines
15 KiB
C
644 lines
15 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: parser.c *
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* Last rev: *
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* mods: *
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* comments: Prolog's parser *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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#endif
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/*
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* Description:
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*
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* parser: produces a prolog term from an array of tokens
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*
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* parser usage: the parser takes its input from an array of token descriptions
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* addressed by the global variable 'tokptr' and produces a Term as result. A
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* macro 'NextToken' should be defined in 'yap.h' for advancing 'tokptr' from
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* one token to the next. In the distributed version this macro also updates
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* a variable named 'toktide' for keeping track of how far the parser went
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* before failling with a syntax error. The parser should be invoked with
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* 'tokptr' pointing to the first token. The last token should have type
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* 'eot_tok'. The parser return either a Term. Syntactic errors are signaled
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* by a return value 0. The parser builds new terms on the 'global stack' and
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* also uses an auxiliary stack pointed to by 'AuxSp'. In the distributed
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* version this auxiliary stack is assumed to grow downwards. This
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* assumption, however, is only relevant to routine 'ParseArgs', and to the
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* variable toktide. conclusion: set tokptr pointing to first token set AuxSp
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* Call Parse
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*
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* VSC: Working whithout known bugs in 87/4/6
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*
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* LD: -I or +I evaluated by parser 87/4/28
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*
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* LD: parser extended 87/4/28
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*
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*/
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#include "Yap.h"
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#include "Yatom.h"
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#include "Heap.h"
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#include "yapio.h"
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#if HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef __STDC__XXX
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#define Volatile volatile
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#else
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#define Volatile
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#endif
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STATIC_PROTO(void GNextToken, (void));
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STATIC_PROTO(void checkfor, (Term));
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STATIC_PROTO(Term ParseArgs, (Atom));
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STATIC_PROTO(Term ParseList, (void));
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STATIC_PROTO(Term ParseTerm, (int));
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/* weak backtraking mechanism based on long_jump */
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typedef struct {
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jmp_buf JmpBuff;
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} JMPBUFF;
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static JMPBUFF FailBuff;
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#define TRY(S,P) \
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{ Volatile JMPBUFF saveenv;\
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Volatile TokEntry *saveT=_YAP_tokptr; \
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Volatile CELL *saveH=H;\
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Volatile int savecurprio=curprio;\
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saveenv=FailBuff;\
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if(!setjmp(FailBuff.JmpBuff)) {\
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S;\
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FailBuff=saveenv;\
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P;\
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}\
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else { FailBuff=saveenv; \
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H=saveH; \
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curprio = savecurprio; \
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_YAP_tokptr=saveT; \
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}\
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}\
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#define TRY3(S,P,F) \
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{ Volatile JMPBUFF saveenv;\
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Volatile TokEntry *saveT=_YAP_tokptr; Volatile CELL *saveH=H;\
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saveenv=FailBuff;\
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if(!setjmp(FailBuff.JmpBuff)) {\
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S;\
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FailBuff=saveenv;\
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P;\
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}\
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else { FailBuff=saveenv; H=saveH; _YAP_tokptr=saveT; F }\
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}\
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#define FAIL longjmp(FailBuff.JmpBuff,1)
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VarEntry *
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_YAP_LookupVar(char *var) /* lookup variable in variables table */
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{
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VarEntry *p;
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#ifdef DEBUG
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if (_YAP_Option[4])
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fprintf(_YAP_stderr,"[LookupVar %s]", var);
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#endif
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if (var[0] != '_' || var[1] != '\0') {
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VarEntry **op = &_YAP_VarTable;
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unsigned char *vp = (unsigned char *)var;
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CELL hv;
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p = _YAP_VarTable;
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HashFunction(vp, hv);
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while (p != NULL) {
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CELL hpv = p->hv;
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if (hv == hpv) {
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Int scmp;
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if ((scmp = strcmp(var, p->VarRep)) == 0) {
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return(p);
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} else if (scmp < 0) {
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op = &(p->VarLeft);
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p = p->VarLeft;
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} else {
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op = &(p->VarRight);
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p = p->VarRight;
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}
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} else if (hv < hpv) {
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op = &(p->VarLeft);
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p = p->VarLeft;
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} else {
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op = &(p->VarRight);
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p = p->VarRight;
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}
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}
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p = (VarEntry *) _YAP_AllocScannerMemory(strlen(var) + sizeof(VarEntry));
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*op = p;
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p->VarLeft = p->VarRight = NULL;
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p->hv = hv;
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strcpy(p->VarRep, var);
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} else {
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/* anon var */
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p = (VarEntry *) _YAP_AllocScannerMemory(sizeof(VarEntry) + 2);
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p->VarLeft = _YAP_AnonVarTable;
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_YAP_AnonVarTable = p;
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p->VarRight = NULL;
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p->hv = 0L;
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p->VarRep[0] = '_';
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p->VarRep[1] = '\0';
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}
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p->VarAdr = TermNil;
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return (p);
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}
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static Term
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VarNames(VarEntry *p,Term l)
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{
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if (p != NULL) {
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if (strcmp(p->VarRep, "_") != 0) {
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Term o = MkPairTerm(MkPairTerm(_YAP_StringToList(p->VarRep), p->VarAdr),
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VarNames(p->VarRight,
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VarNames(p->VarLeft,l)));
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if (H > ASP-4096) {
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longjmp(_YAP_IOBotch,1);
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}
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return(o);
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} else {
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return(VarNames(p->VarRight,VarNames(p->VarLeft,l)));
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}
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} else {
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return (l);
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}
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}
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Term
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_YAP_VarNames(VarEntry *p,Term l)
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{
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return VarNames(p,l);
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}
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static int
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IsPrefixOp(Prop opinfo,int *pptr, int *rpptr)
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{
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int p;
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READ_LOCK(RepOpProp(opinfo)->OpRWLock);
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if ((p = RepOpProp(opinfo)->Prefix) != 0) {
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READ_UNLOCK(RepOpProp(opinfo)->OpRWLock);
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*pptr = *rpptr = p & MaskPrio;
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if (p & DcrrpFlag)
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--* rpptr;
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return (TRUE);
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} else {
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READ_UNLOCK(RepOpProp(opinfo)->OpRWLock);
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return (FALSE);
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}
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}
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int
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_YAP_IsPrefixOp(Prop opinfo,int *pptr, int *rpptr)
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{
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return IsPrefixOp(opinfo,pptr,rpptr);
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}
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static int
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IsInfixOp(Prop opinfo, int *pptr, int *lpptr, int *rpptr)
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{
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int p;
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READ_LOCK(RepOpProp(opinfo)->OpRWLock);
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if ((p = RepOpProp(opinfo)->Infix) != 0) {
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READ_UNLOCK(RepOpProp(opinfo)->OpRWLock);
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*pptr = *rpptr = *lpptr = p & MaskPrio;
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if (p & DcrrpFlag)
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--* rpptr;
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if (p & DcrlpFlag)
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--* lpptr;
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return (TRUE);
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} else {
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READ_UNLOCK(RepOpProp(opinfo)->OpRWLock);
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return (FALSE);
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}
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}
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int
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_YAP_IsInfixOp(Prop opinfo, int *pptr, int *lpptr, int *rpptr)
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{
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return IsInfixOp(opinfo, pptr, lpptr, rpptr);
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}
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static int
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IsPosfixOp(Prop opinfo, int *pptr, int *lpptr)
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{
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int p;
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READ_LOCK(RepOpProp(opinfo)->OpRWLock);
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if ((p = RepOpProp(opinfo)->Posfix) != 0) {
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READ_UNLOCK(RepOpProp(opinfo)->OpRWLock);
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*pptr = *lpptr = p & MaskPrio;
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if (p & DcrlpFlag)
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--* lpptr;
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return (TRUE);
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} else {
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READ_UNLOCK(RepOpProp(opinfo)->OpRWLock);
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return (FALSE);
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}
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}
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int
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_YAP_IsPosfixOp(Prop opinfo, int *pptr, int *lpptr)
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{
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return IsPosfixOp(opinfo, pptr, lpptr);
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}
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inline static void
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GNextToken(void)
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{
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if (_YAP_tokptr->Tok == Ord(eot_tok))
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return;
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#ifdef EMACS
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if ((_YAP_tokptr = _YAP_tokptr->TokNext)->TokPos > _YAP_toktide->TokPos)
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_YAP_toktide = _YAP_tokptr;
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#else
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if (_YAP_tokptr == _YAP_toktide)
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_YAP_toktide = _YAP_tokptr = _YAP_tokptr->TokNext;
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else
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_YAP_tokptr = _YAP_tokptr->TokNext;
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#endif
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}
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inline static void
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checkfor(Term c)
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{
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if (_YAP_tokptr->Tok != Ord(Ponctuation_tok)
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|| _YAP_tokptr->TokInfo != c)
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FAIL;
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NextToken;
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}
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static Term
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ParseArgs(Atom a)
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{
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int nargs = 0;
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Term *p, t;
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#ifdef SFUNC
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SFEntry *pe = (SFEntry *) _YAP_GetAProp(a, SFProperty);
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#endif
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NextToken;
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p = (Term *) ParserAuxSp;
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while (1) {
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Term *tp = (Term *)ParserAuxSp;
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*tp++ = Unsigned(ParseTerm(999));
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ParserAuxSp = (tr_fr_ptr)tp;
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++nargs;
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if (_YAP_tokptr->Tok != Ord(Ponctuation_tok))
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break;
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if (((int) _YAP_tokptr->TokInfo) != ',')
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break;
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NextToken;
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}
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ParserAuxSp = (tr_fr_ptr)p;
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/*
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* Needed because the arguments for the functor are placed in reverse
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* order
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*/
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if (H > ASP-(nargs+1)) {
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_YAP_ErrorMessage = "Stack Overflow";
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FAIL;
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}
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#ifdef SFUNC
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if (pe)
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t = MkSFTerm(_YAP_MkFunctor(a, SFArity), nargs, p, pe->NilValue);
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else
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t = _YAP_MkApplTerm(_YAP_MkFunctor(a, nargs), nargs, p);
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#else
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t = _YAP_MkApplTerm(_YAP_MkFunctor(a, nargs), nargs, p);
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#endif
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/* check for possible overflow against local stack */
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checkfor((Term) ')');
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return (t);
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}
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static Term
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ParseList(void)
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{
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Term o;
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CELL *to_store;
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o = AbsPair(H);
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loop:
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to_store = H;
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H+=2;
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to_store[0] = ParseTerm(999);
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if (_YAP_tokptr->Tok == Ord(Ponctuation_tok)) {
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if (((int) _YAP_tokptr->TokInfo) == ',') {
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NextToken;
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if (_YAP_tokptr->Tok == Ord(Name_tok)
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&& strcmp(RepAtom((Atom)(_YAP_tokptr->TokInfo))->StrOfAE, "..") == 0) {
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NextToken;
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to_store[1] = ParseTerm(999);
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} else {
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/* check for possible overflow against local stack */
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if (H > ASP-4096) {
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to_store[1] = TermNil;
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_YAP_ErrorMessage = "Stack Overflow";
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FAIL;
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} else {
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to_store[1] = AbsPair(H);
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goto loop;
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}
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}
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} else if (((int) _YAP_tokptr->TokInfo) == '|') {
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NextToken;
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to_store[1] = ParseTerm(999);
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} else {
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to_store[1] = MkAtomTerm(AtomNil);
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}
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} else
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FAIL;
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return (o);
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}
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#ifndef INFINITY
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#define INFINITY (1.0/0.0)
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#endif
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#ifndef NAN
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#define NAN (0.0/0.0)
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#endif
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static Term
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ParseTerm(int prio)
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{
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/* parse term with priority prio */
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Volatile Prop opinfo;
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Volatile Term t;
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Volatile Functor func;
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Volatile VarEntry *varinfo;
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Volatile int curprio = 0, opprio, oplprio, oprprio;
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switch (_YAP_tokptr->Tok) {
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case Name_tok:
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t = _YAP_tokptr->TokInfo;
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NextToken;
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if ((_YAP_tokptr->Tok != Ord(Ponctuation_tok)
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|| Unsigned(_YAP_tokptr->TokInfo) != 'l')
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&& (opinfo = _YAP_GetAProp((Atom) t, OpProperty))
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&& IsPrefixOp(opinfo, &opprio, &oprprio)
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) {
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/* special rules apply for +1, -2.3, etc... */
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if (_YAP_tokptr->Tok == Number_tok) {
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if ((Atom)t == AtomMinus) {
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t = _YAP_tokptr->TokInfo;
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if (IsIntTerm(t))
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t = MkIntTerm(-IntOfTerm(t));
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else if (IsFloatTerm(t))
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t = MkFloatTerm(-FloatOfTerm(t));
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#ifdef USE_GMP
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else if (IsBigIntTerm(t)) {
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MP_INT *new = _YAP_PreAllocBigNum();
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mpz_neg(new, _YAP_BigIntOfTerm(t));
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t = _YAP_MkBigIntTerm(new);
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}
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#endif
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else
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t = MkLongIntTerm(-LongIntOfTerm(t));
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NextToken;
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break;
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} else if ((Atom)t == AtomPlus) {
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t = _YAP_tokptr->TokInfo;
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NextToken;
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break;
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}
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} else if (_YAP_tokptr->Tok == Name_tok) {
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Atom at = (Atom)_YAP_tokptr->TokInfo;
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#ifndef _MSC_VER
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if ((Atom)t == AtomPlus) {
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if (at == AtomInf) {
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t = MkFloatTerm(INFINITY);
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NextToken;
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break;
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} else if (at == AtomNan) {
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t = MkFloatTerm(NAN);
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NextToken;
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break;
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}
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} else if ((Atom)t == AtomMinus) {
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if (at == AtomInf) {
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t = MkFloatTerm(-INFINITY);
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NextToken;
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break;
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} else if (at == AtomNan) {
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t = MkFloatTerm(NAN);
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NextToken;
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break;
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}
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}
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#endif
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}
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if (opprio <= prio) {
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/* try to parse as a prefix operator */
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TRY(
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/* build appl on the heap */
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func = _YAP_MkFunctor((Atom) t, 1);
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t = ParseTerm(oprprio);
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t = _YAP_MkApplTerm(func, 1, &t);
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/* check for possible overflow against local stack */
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if (H > ASP-4096) {
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_YAP_ErrorMessage = "Stack Overflow";
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FAIL;
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}
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curprio = opprio;
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,
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break;
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)
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}
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}
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if (_YAP_tokptr->Tok == Ord(Ponctuation_tok)
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&& Unsigned(_YAP_tokptr->TokInfo) == 'l')
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t = ParseArgs((Atom) t);
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else
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t = MkAtomTerm((Atom)t);
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break;
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case Number_tok:
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t = _YAP_tokptr->TokInfo;
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NextToken;
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break;
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case String_tok: /* build list on the heap */
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{
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Volatile char *p = (char *) _YAP_tokptr->TokInfo;
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if (*p == 0)
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t = MkAtomTerm(AtomNil);
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else if (yap_flags[YAP_DOUBLE_QUOTES_FLAG] == STRING_AS_CHARS)
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t = _YAP_StringToListOfAtoms(p);
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else if (yap_flags[YAP_DOUBLE_QUOTES_FLAG] == STRING_AS_ATOM)
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t = MkAtomTerm(_YAP_LookupAtom(p));
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else
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t = _YAP_StringToList(p);
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NextToken;
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}
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break;
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case Var_tok:
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varinfo = (VarEntry *) (_YAP_tokptr->TokInfo);
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if ((t = varinfo->VarAdr) == TermNil) {
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t = varinfo->VarAdr = MkVarTerm();
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}
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NextToken;
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break;
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case Ponctuation_tok:
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switch ((int) _YAP_tokptr->TokInfo) {
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case '(':
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case 'l': /* non solo ( */
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NextToken;
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t = ParseTerm(1200);
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checkfor((Term) ')');
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break;
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case '[':
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NextToken;
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t = ParseList();
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checkfor((Term) ']');
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break;
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case '{':
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NextToken;
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if (_YAP_tokptr->Tok == Ord(Ponctuation_tok) &&
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Unsigned(_YAP_tokptr->TokInfo) == '}') {
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t = MkAtomTerm(NameOfFunctor(FunctorBraces));
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NextToken;
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} else {
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t = ParseTerm(1200);
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t = _YAP_MkApplTerm(FunctorBraces, 1, &t);
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|
/* check for possible overflow against local stack */
|
|
if (H > ASP-4096) {
|
|
_YAP_ErrorMessage = "Stack Overflow";
|
|
FAIL;
|
|
}
|
|
checkfor((Term) '}');
|
|
}
|
|
break;
|
|
default:
|
|
FAIL;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
|
|
FAIL;
|
|
}
|
|
|
|
/* main loop to parse infix and posfix operators starts here */
|
|
while (TRUE) {
|
|
if (_YAP_tokptr->Tok == Ord(Name_tok)
|
|
&& (opinfo = _YAP_GetAProp((Atom)(_YAP_tokptr->TokInfo), OpProperty))) {
|
|
Prop save_opinfo = opinfo;
|
|
if (IsInfixOp(opinfo, &opprio, &oplprio, &oprprio)
|
|
&& opprio <= prio && oplprio >= curprio) {
|
|
/* try parsing as infix operator */
|
|
Volatile int oldprio = curprio;
|
|
TRY3(
|
|
func = _YAP_MkFunctor((Atom) _YAP_tokptr->TokInfo, 2);
|
|
NextToken;
|
|
{
|
|
Term args[2];
|
|
args[0] = t;
|
|
args[1] = ParseTerm(oprprio);
|
|
t = _YAP_MkApplTerm(func, 2, args);
|
|
/* check for possible overflow against local stack */
|
|
if (H > ASP-4096) {
|
|
_YAP_ErrorMessage = "Stack Overflow";
|
|
FAIL;
|
|
}
|
|
},
|
|
curprio = opprio;
|
|
opinfo = save_opinfo;
|
|
continue;
|
|
,
|
|
opinfo = save_opinfo;
|
|
curprio = oldprio;
|
|
)
|
|
}
|
|
if (IsPosfixOp(opinfo, &opprio, &oplprio)
|
|
&& opprio <= prio && oplprio >= curprio) {
|
|
/* parse as posfix operator */
|
|
t = _YAP_MkApplTerm(_YAP_MkFunctor((Atom) _YAP_tokptr->TokInfo, 1), 1, &t);
|
|
/* check for possible overflow against local stack */
|
|
if (H > ASP-4096) {
|
|
_YAP_ErrorMessage = "Stack Overflow";
|
|
FAIL;
|
|
}
|
|
curprio = opprio;
|
|
NextToken;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
if (_YAP_tokptr->Tok == Ord(Ponctuation_tok)) {
|
|
if (Unsigned(_YAP_tokptr->TokInfo) == ',' &&
|
|
prio >= 1000 && curprio <= 999) {
|
|
Volatile Term args[2];
|
|
NextToken;
|
|
args[0] = t;
|
|
args[1] = ParseTerm(1000);
|
|
t = _YAP_MkApplTerm(_YAP_MkFunctor(AtomComma, 2), 2, args);
|
|
/* check for possible overflow against local stack */
|
|
if (H > ASP-4096) {
|
|
_YAP_ErrorMessage = "Stack Overflow";
|
|
FAIL;
|
|
}
|
|
curprio = 1000;
|
|
continue;
|
|
} else if (Unsigned(_YAP_tokptr->TokInfo) == '|' && prio >= 1100 &&
|
|
curprio <= 1099) {
|
|
Volatile Term args[2];
|
|
NextToken;
|
|
args[0] = t;
|
|
args[1] = ParseTerm(1100);
|
|
t = _YAP_MkApplTerm(FunctorVBar, 2, args);
|
|
/* check for possible overflow against local stack */
|
|
if (H > ASP-4096) {
|
|
_YAP_ErrorMessage = "Stack Overflow";
|
|
FAIL;
|
|
}
|
|
curprio = 1100;
|
|
continue;
|
|
}
|
|
}
|
|
if (_YAP_tokptr->Tok <= Ord(String_tok))
|
|
FAIL;
|
|
break;
|
|
}
|
|
return (t);
|
|
}
|
|
|
|
|
|
Term
|
|
_YAP_Parse(void)
|
|
{
|
|
Volatile Term t;
|
|
if (!setjmp(FailBuff.JmpBuff)) {
|
|
t = ParseTerm(1200);
|
|
if (_YAP_tokptr->Tok != Ord(eot_tok))
|
|
return (0L);
|
|
return (t);
|
|
} else
|
|
return (0);
|
|
}
|