/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: write.c *
* Last rev: *
* mods: *
* comments: Writing a Prolog Term *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[] = "%W% %G%";
#endif
#include <stdlib.h>
#include <math.h>
#include "Yap.h"
#include "Yatom.h"
#include "YapHeap.h"
#include "yapio.h"
#include "clause.h"
#if COROUTINING
#include "attvar.h"
#endif
#if HAVE_STRING_H
#include <string.h>
#endif
#if HAVE_CTYPE_H
#include <ctype.h>
#endif
/* describe the type of the previous term to have been written */
typedef enum {
separator, /* the previous term was a separator like ',', ')', ... */
alphanum, /* the previous term was an atom or number */
symbol /* the previous term was a symbol like +, -, *, .... */
} wtype;
typedef void *wrf;
typedef struct union_slots {
Int old;
Int ptr;
} uslots;
typedef struct union_direct {
Term old;
CELL *ptr;
} udirect;
typedef struct rewind_term {
struct rewind_term *parent;
union {
struct union_slots s;
struct union_direct d;
} u;
} rwts;
typedef struct write_globs {
void *stream;
int Quote_illegal, Ignore_ops, Handle_vars, Use_portray, Portray_delays;
int Keep_terms;
int Write_Loops;
int Write_strings;
int last_atom_minus;
UInt MaxDepth, MaxArgs;
wtype lw;
} wglbs;
#define lastw wglb->lw
#define last_minus wglb->last_atom_minus
STATIC_PROTO(void wrputn, (Int, struct write_globs *));
STATIC_PROTO(void wrputf, (Float, struct write_globs *));
STATIC_PROTO(void wrputref, (CODEADDR, int, struct write_globs *));
STATIC_PROTO(int legalAtom, (unsigned char *));
/*STATIC_PROTO(int LeftOpToProtect, (Atom, int));
STATIC_PROTO(int RightOpToProtect, (Atom, int));*/
STATIC_PROTO(wtype AtomIsSymbols, (unsigned char *));
STATIC_PROTO(void putAtom, (Atom, int, struct write_globs *));
STATIC_PROTO(void writeTerm, (Term, int, int, int, struct write_globs *, struct rewind_term *));
#define wrputc(X,WF) Sputcode(X,WF) /* writes a character */
/*
protect bracket from merging with previoous character.
avoid stuff like not (2,3) -> not(2,3) or
*/
static void
wropen_bracket(struct write_globs *wglb, int protect)
{
wrf stream = wglb->stream;
if (lastw != separator && protect)
wrputc(' ', stream);
wrputc('(', stream);
lastw = separator;
}
static void
wrclose_bracket(struct write_globs *wglb, int protect)
{
wrf stream = wglb->stream;
wrputc(')', stream);
lastw = separator;
}
static int
protect_open_number(struct write_globs *wglb, int lm, int minus_required)
{
wrf stream = wglb->stream;
if (lastw == symbol && lm && !minus_required) {
wropen_bracket(wglb, TRUE);
return TRUE;
} else if (lastw == alphanum ||
(lastw == symbol && minus_required)) {
wrputc(' ', stream);
}
return FALSE;
}
static void
protect_close_number(struct write_globs *wglb, int used_bracket)
{
if (used_bracket) {
wrclose_bracket(wglb, TRUE);
} else {
lastw = alphanum;
}
last_minus = FALSE;
}
static void
wrputn(Int n, struct write_globs *wglb) /* writes an integer */
{
wrf stream = wglb->stream;
char s[256], *s1=s; /* that should be enough for most integers */
int has_minus = (n < 0);
int ob;
ob = protect_open_number(wglb, last_minus, has_minus);
#if HAVE_SNPRINTF
snprintf(s, 256, Int_FORMAT, n);
#else
sprintf(s, Int_FORMAT, n);
#endif
while (*s1)
wrputc(*s1++, stream);
protect_close_number(wglb, ob);
}
#define wrputs(s, stream) Sfputs(s, stream)
static void
wrputws(wchar_t *s, wrf stream) /* writes a string */
{
while (*s)
wrputc(*s++, stream);
}
#ifdef USE_GMP
static char *
ensure_space(size_t sz) {
CACHE_REGS
char *s;
s = (char *) Yap_PreAllocCodeSpace();
while (s+sz >= (char *)AuxSp) {
#if USE_SYSTEM_MALLOC
/* may require stack expansion */
if (!Yap_ExpandPreAllocCodeSpace(sz, NULL, TRUE)) {
s = NULL;
break;
}
s = (char *) Yap_PreAllocCodeSpace();
#else
s = NULL;
#endif
}
if (!s) {
s = (char *)TR;
while (s+sz >= LOCAL_TrailTop) {
if (!Yap_growtrail(sz/sizeof(CELL), FALSE)) {
s = NULL;
break;
}
s = (char *)TR;
}
}
if (!s) {
s = (char *)H;
if (s+sz >= (char *)ASP) {
Yap_Error(OUT_OF_STACK_ERROR,TermNil,"not enough space to write bignum: it requires %d bytes", sz);
s = NULL;
}
}
return s;
}
static void
write_mpint(MP_INT *big, struct write_globs *wglb) {
char *s;
int has_minus = mpz_sgn(big);
int ob;
s = ensure_space(3+mpz_sizeinbase(big, 10));
ob = protect_open_number(wglb, last_minus, has_minus);
if (!s) {
s = mpz_get_str(NULL, 10, big);
if (!s)
return;
wrputs(s,wglb->stream);
free(s);
} else {
mpz_get_str(s, 10, big);
wrputs(s,wglb->stream);
}
protect_close_number(wglb, ob);
}
#endif
/* writes a bignum */
static void
writebig(Term t, int p, int depth, int rinfixarg, struct write_globs *wglb, struct rewind_term *rwt)
{
CELL *pt = RepAppl(t)+1;
CELL big_tag = pt[0];
#ifdef USE_GMP
if (big_tag == BIG_INT)
{
MP_INT *big = Yap_BigIntOfTerm(t);
write_mpint(big, wglb);
return;
} else if (big_tag == BIG_RATIONAL) {
Term trat = Yap_RatTermToApplTerm(t);
writeTerm(trat, p, depth, rinfixarg, wglb, rwt);
return;
}
#endif
if (big_tag == BLOB_STRING) {
if (wglb->Write_strings)
wrputc('`',wglb->stream);
else
wrputc('"',wglb->stream);
wrputs(Yap_BlobStringOfTerm(t),wglb->stream);
if (wglb->Write_strings)
wrputc('`',wglb->stream);
else
wrputc('"',wglb->stream);
return;
} else if (big_tag == BLOB_WIDE_STRING) {
wchar_t *s = Yap_BlobWideStringOfTerm(t);
if (wglb->Write_strings)
wrputc('`',wglb->stream);
else
wrputc('"', wglb->stream);
while (*s) {
wrputc(*s++, wglb->stream);
}
if (wglb->Write_strings)
wrputc('`',wglb->stream);
else
wrputc('"',wglb->stream);
return;
} else if (big_tag >= USER_BLOB_START && big_tag < USER_BLOB_END) {
Opaque_CallOnWrite f;
CELL blob_info;
blob_info = big_tag - USER_BLOB_START;
if (GLOBAL_OpaqueHandlers &&
(f= GLOBAL_OpaqueHandlers[blob_info].write_handler)) {
(f)(wglb->stream, big_tag, (void *)((MP_INT *)(pt+1)), 0);
}
}
wrputs("0",wglb->stream);
}
static void
wrputf(Float f, struct write_globs *wglb) /* writes a float */
{
char s[256];
wrf stream = wglb->stream;
int sgn;
int ob;
#if HAVE_ISNAN || defined(__WIN32)
if (isnan(f)) {
wrputs("(nan)", stream);
lastw = separator;
return;
}
#endif
sgn = (f < 0.0);
#if HAVE_ISINF || defined(_WIN32)
if (isinf(f)) {
if (sgn) {
wrputs("(-inf)", stream);
} else {
wrputs("(+inf)", stream);
}
lastw = separator;
return;
}
#endif
ob = protect_open_number(wglb, last_minus, sgn);
#if THREADS
/* old style writing */
int found_dot = FALSE, found_exp = FALSE;
char *pt = s;
int ch;
if (lastw == symbol || lastw == alphanum) {
wrputc(' ', stream);
}
lastw = alphanum;
// sprintf(s, "%.15g", f);
sprintf(s, RepAtom(AtomFloatFormat)->StrOfAE, f);
while (*pt == ' ')
pt++;
if (*pt == '-') {
wrputc('-', stream);
pt++;
}
while ((ch = *pt) != '\0') {
switch (ch) {
case '.':
found_dot = TRUE;
wrputc('.', stream);
break;
case 'e':
case 'E':
if (!found_dot) {
found_dot = TRUE;
wrputs(".0", stream);
}
found_exp = TRUE;
default:
wrputc(ch, stream);
}
pt++;
}
if (!found_dot) {
wrputs(".0", stream);
}
#else
char *format_float(double f, char *buf);
char *buf;
if (lastw == symbol || lastw == alphanum) {
wrputc(' ', stream);
}
/* use SWI's format_float */
buf = format_float(f, s);
if (!buf) return;
wrputs(buf, stream);
#endif
protect_close_number(wglb, ob);
}
/* writes a data base reference */
static void
wrputref(CODEADDR ref, int Quote_illegal, struct write_globs *wglb)
{
char s[256];
wrf stream = wglb->stream;
putAtom(AtomDBref, Quote_illegal, wglb);
#if defined(__linux__) || defined(__APPLE__)
sprintf(s, "(%p," UInt_FORMAT ")", ref, ((LogUpdClause*)ref)->ClRefCount);
#else
sprintf(s, "(0x%p," UInt_FORMAT ")", ref, ((LogUpdClause*)ref)->ClRefCount);
#endif
wrputs(s, stream);
lastw = alphanum;
}
/* writes a blob (default) */
static void
wrputblob(CODEADDR ref, int Quote_illegal, struct write_globs *wglb)
{
char s[256];
wrf stream = wglb->stream;
putAtom(AtomSWIStream, Quote_illegal, wglb);
#if defined(__linux__) || defined(__APPLE__)
sprintf(s, "(%p)", ref);
#else
sprintf(s, "(0x%p)", ref);
#endif
wrputs(s, stream);
lastw = alphanum;
}
static int
legalAtom(unsigned char *s) /* Is this a legal atom ? */
{
wchar_t ch = *s;
if (ch == '\0')
return FALSE;
if (Yap_chtype[ch] != LC) {
if (ch == '[') {
return (s[1] == ']' && !s[2]);
} else if (ch == '{') {
return (s[1] == '}' && !s[2]);
} else if (Yap_chtype[ch] == SL) {
return (!s[1]);
} else if ((ch == ',' || ch == '.') && !s[1]) {
return FALSE;
} else {
if (ch == '/') {
if (s[1] == '*') return FALSE;
}
while (ch) {
if (Yap_chtype[ch] != SY) {
return FALSE;
}
ch = *++s;
}
}
return TRUE;
} else
while ((ch = *++s) != 0)
if (Yap_chtype[ch] > NU)
return FALSE;
return (TRUE);
}
static wtype
AtomIsSymbols(unsigned char *s) /* Is this atom just formed by symbols ? */
{
int ch;
if (Yap_chtype[(int)s[0]] == SL && s[1] == '\0')
return(separator);
while ((ch = *s++) != '\0') {
if (Yap_chtype[ch] != SY)
return alphanum;
}
return symbol;
}
static void
write_quoted(int ch, int quote, wrf stream)
{
if (yap_flags[CHARACTER_ESCAPE_FLAG] == CPROLOG_CHARACTER_ESCAPES) {
wrputc(ch, stream);
if (ch == '\'')
wrputc('\'', stream); /* be careful about quotes */
return;
}
if (!(ch < 0xff && chtype(ch) == BS) && ch != '\'' && ch != '\\') {
wrputc(ch, stream);
} else {
switch (ch) {
case '\\':
case '\'':
wrputc('\\', stream);
wrputc(ch, stream);
break;
case 7:
wrputc('\\', stream);
wrputc('a', stream);
break;
case '\b':
wrputc('\\', stream);
wrputc('b', stream);
break;
case '\t':
wrputc('\\', stream);
wrputc('t', stream);
break;
case ' ':
case 160:
wrputc(' ', stream);
break;
case '\n':
wrputc('\\', stream);
wrputc('n', stream);
break;
case 11:
wrputc('\\', stream);
wrputc('v', stream);
break;
case '\r':
wrputc('\\', stream);
wrputc('r', stream);
break;
case '\f':
wrputc('\\', stream);
wrputc('f', stream);
break;
default:
if ( ch <= 0xff ) {
char esc[8];
if (yap_flags[CHARACTER_ESCAPE_FLAG] == SICSTUS_CHARACTER_ESCAPES) {
sprintf(esc, "\\%03o", ch);
} else {
/* last backslash in ISO mode */
sprintf(esc, "\\%03o\\", ch);
}
wrputs(esc, stream);
}
}
}
}
/* writes an atom */
static void
putAtom(Atom atom, int Quote_illegal, struct write_globs *wglb)
{
unsigned char *s;
wtype atom_or_symbol;
wrf stream = wglb->stream;
if (IsBlob(atom)) {
wrputblob((CODEADDR)RepAtom(atom),wglb->Quote_illegal,wglb);
return;
}
if (IsWideAtom(atom)) {
wchar_t *ws = RepAtom(atom)->WStrOfAE;
if (Quote_illegal) {
wrputc('\'', stream);
while (*ws) {
wchar_t ch = *ws++;
write_quoted(ch, '\'', stream);
}
wrputc('\'', stream);
} else {
wrputws(ws, stream);
}
return;
}
s = (unsigned char *)RepAtom(atom)->StrOfAE;
/* #define CRYPT_FOR_STEVE 1*/
#ifdef CRYPT_FOR_STEVE
if (Yap_GetValue(AtomCryptAtoms) != TermNil && Yap_GetAProp(atom, OpProperty) == NIL) {
char s[16];
sprintf(s,"x%x", (CELL)s);
wrputs(s, stream);
return;
}
#endif
/* if symbol then last_minus is important */
last_minus = FALSE;
atom_or_symbol = AtomIsSymbols(s);
if (lastw == atom_or_symbol && atom_or_symbol != separator /* solo */)
wrputc(' ', stream);
lastw = atom_or_symbol;
if (Quote_illegal && !legalAtom(s)) {
wrputc('\'', stream);
while (*s) {
wchar_t ch = *s++;
write_quoted(ch, '\'', stream);
}
wrputc('\'', stream);
} else {
wrputs((char *)s, stream);
}
}
static int
IsStringTerm(Term string) /* checks whether this is a string */
{
if (IsVarTerm(string))
return FALSE;
do {
Term hd;
int ch;
if (!IsPairTerm(string)) return(FALSE);
hd = HeadOfTerm(string);
if (IsVarTerm(hd)) return(FALSE);
if (!IsIntTerm(hd)) return(FALSE);
ch = IntOfTerm(HeadOfTerm(string));
if ((ch < ' ' || ch > MAX_ISO_LATIN1) && ch != '\n' && ch != '\t')
return(FALSE);
string = TailOfTerm(string);
if (IsVarTerm(string)) return(FALSE);
} while (string != TermNil);
return(TRUE);
}
/* writes a string */
static void
putString(Term string, struct write_globs *wglb)
{
wrf stream = wglb->stream;
wrputc('"', stream);
while (string != TermNil) {
int ch = IntOfTerm(HeadOfTerm(string));
write_quoted(ch, '"', stream);
string = TailOfTerm(string);
}
wrputc('"', stream);
lastw = alphanum;
}
/* writes a string */
static void
putUnquotedString(Term string, struct write_globs *wglb)
{
wrf stream = wglb->stream;
while (string != TermNil) {
int ch = IntOfTerm(HeadOfTerm(string));
wrputc(ch, stream);
string = TailOfTerm(string);
}
lastw = alphanum;
}
static Term
from_pointer(CELL *ptr0, struct rewind_term *rwt, struct write_globs *wglb)
{
CACHE_REGS
Term t;
CELL *ptr = ptr0;
while (IsVarTerm(*ptr) && !IsUnboundVar(ptr))
ptr = (CELL *)*ptr;
t = *ptr;
if (wglb->Keep_terms) {
struct rewind_term *x = rwt->parent;
rwt->u.s.old = Yap_InitSlot(t PASS_REGS);
rwt->u.s.ptr = Yap_InitSlot((CELL)ptr0 PASS_REGS);
if (!IsAtomicTerm(t) && !IsVarTerm(t)) {
while (x) {
if (Yap_GetDerefedFromSlot(x->u.s.old PASS_REGS) == t)
return TermFoundVar;
x = x->parent;
}
}
} else {
rwt->u.d.old = t;
rwt->u.d.ptr = ptr0;
if (!IsAtomicTerm(t) && !IsVarTerm(t)) {
struct rewind_term *x = rwt->parent;
while (x) {
if (x->u.d.old == t)
return TermFoundVar;
x = x->parent;
}
}
}
return t;
}
static CELL *
restore_from_write(struct rewind_term *rwt, struct write_globs *wglb)
{
CACHE_REGS
CELL *ptr;
if (wglb->Keep_terms) {
ptr = (CELL*)Yap_GetPtrFromSlot(rwt->u.s.ptr PASS_REGS);
Yap_RecoverSlots(2 PASS_REGS);
} else {
ptr = rwt->u.d.ptr;
}
rwt->u.s.ptr = 0;
return ptr;
}
/* writes an unbound variable */
static void
write_var(CELL *t, struct write_globs *wglb, struct rewind_term *rwt)
{
CACHE_REGS
if (lastw == alphanum) {
wrputc(' ', wglb->stream);
}
wrputc('_', wglb->stream);
/* make sure we don't get no creepy spaces where they shouldn't be */
lastw = separator;
if (IsAttVar(t)) {
Int vcount = (t-H0);
if (wglb->Portray_delays) {
exts ext = ExtFromCell(t);
struct rewind_term nrwt;
nrwt.parent = rwt;
nrwt.u.s.ptr = 0;
wglb->Portray_delays = FALSE;
if (ext == attvars_ext) {
attvar_record *attv = RepAttVar(t);
CELL *l = &attv->Value; /* dirty low-level hack, check atts.h */
wrputs("$AT(",wglb->stream);
write_var(t, wglb, rwt);
wrputc(',', wglb->stream);
writeTerm(from_pointer(l, &nrwt, wglb), 999, 1, FALSE, wglb, &nrwt);
l = restore_from_write(&nrwt, wglb);
wrputc(',', wglb->stream);
l ++;
writeTerm(from_pointer(l, &nrwt, wglb), 999, 1, FALSE, wglb, &nrwt);
restore_from_write(&nrwt, wglb);
wrclose_bracket(wglb, TRUE);
}
wglb->Portray_delays = TRUE;
return;
}
wrputc('D', wglb->stream);
wrputn(vcount,wglb);
} else {
wrputn(((Int) (t- H0)),wglb);
}
}
static Term
check_infinite_loop(Term t, struct rewind_term *x, struct write_globs *wglb)
{
CACHE_REGS
if (wglb->Keep_terms) {
while (x) {
if (Yap_GetFromSlot(x->u.s.old PASS_REGS) == t)
return TermFoundVar;
x = x->parent;
}
} else {
while (x) {
if (x->u.d.old == t)
return TermFoundVar;
x = x->parent;
}
}
return t;
}
static void
write_list(Term t, int direction, int depth, struct write_globs *wglb, struct rewind_term *rwt)
{
CACHE_REGS
Term ti;
struct rewind_term nrwt;
nrwt.parent = rwt;
nrwt.u.s.ptr = 0;
while (1) {
int ndirection;
int do_jump;
writeTerm(from_pointer(RepPair(t), &nrwt, wglb), 999, depth+1, FALSE, wglb, &nrwt);
t = AbsPair(restore_from_write(&nrwt, wglb));
ti = TailOfTerm(t);
if (IsVarTerm(ti))
break;
if (!IsPairTerm(ti) ||
!IsPairTerm((ti = check_infinite_loop(ti, rwt, wglb))))
break;
ndirection = RepPair(ti)-RepPair(t);
/* make sure we're not trapped in loops */
if (ndirection > 0) {
do_jump = (direction <= 0);
} else if (ndirection == 0) {
wrputc(',', wglb->stream);
putAtom(AtomFoundVar, wglb->Quote_illegal, wglb);
lastw = separator;
return;
} else {
do_jump = (direction >= 0);
}
if (wglb->MaxDepth != 0 && depth > wglb->MaxDepth) {
wrputc('|', wglb->stream);
putAtom(Atom3Dots, wglb->Quote_illegal, wglb);
return;
}
lastw = separator;
direction = ndirection;
depth++;
if (do_jump)
break;
wrputc(',', wglb->stream);
t = ti;
}
if (IsPairTerm(ti)) {
Term nt = from_pointer(RepPair(t)+1, &nrwt, wglb);
/* we found an infinite loop */
if (IsAtomTerm(nt)) {
wrputc('|', wglb->stream);
writeTerm(nt, 999, depth, FALSE, wglb, rwt);
} else {
/* keep going on the list */
wrputc(',', wglb->stream);
write_list(nt, direction, depth, wglb, &nrwt);
}
restore_from_write(&nrwt, wglb);
} else if (ti != MkAtomTerm(AtomNil)) {
wrputc('|', wglb->stream);
lastw = separator;
writeTerm(from_pointer(RepPair(t)+1, &nrwt, wglb), 999, depth, FALSE, wglb, &nrwt);
restore_from_write(&nrwt, wglb);
}
}
static void
writeTerm(Term t, int p, int depth, int rinfixarg, struct write_globs *wglb, struct rewind_term *rwt)
/* term to write */
/* context priority */
{
CACHE_REGS
struct rewind_term nrwt;
nrwt.parent = rwt;
nrwt.u.s.ptr = 0;
if (wglb->MaxDepth != 0 && depth > wglb->MaxDepth) {
putAtom(Atom3Dots, wglb->Quote_illegal, wglb);
return;
}
if (EX)
return;
t = Deref(t);
if (IsVarTerm(t)) {
write_var((CELL *)t, wglb, &nrwt);
} else if (IsIntTerm(t)) {
wrputn((Int) IntOfTerm(t),wglb);
} else if (IsAtomTerm(t)) {
putAtom(AtomOfTerm(t), wglb->Quote_illegal, wglb);
} else if (IsPairTerm(t)) {
if (wglb->Ignore_ops) {
wrputs("'.'(",wglb->stream);
lastw = separator;
writeTerm(from_pointer(RepPair(t), &nrwt, wglb), 999, depth + 1, FALSE, wglb, &nrwt);
t = AbsPair(restore_from_write(&nrwt, wglb));
wrputs(",",wglb->stream);
writeTerm(from_pointer(RepPair(t)+1, &nrwt, wglb), 999, depth + 1, FALSE, wglb, &nrwt);
restore_from_write(&nrwt, wglb);
wrclose_bracket(wglb, TRUE);
return;
}
if (wglb->Use_portray) {
Term targs[1];
struct DB_TERM *old_EX = NULL;
Int sl = 0;
targs[0] = t;
Yap_PutValue(AtomPortray, MkAtomTerm(AtomNil));
if (EX) old_EX = EX;
sl = Yap_InitSlot(t PASS_REGS);
Yap_execute_goal(Yap_MkApplTerm(FunctorPortray, 1, targs), 0, 1);
t = Yap_GetFromSlot(sl PASS_REGS);
Yap_RecoverSlots(1 PASS_REGS);
if (old_EX != NULL) EX = old_EX;
if (Yap_GetValue(AtomPortray) == MkAtomTerm(AtomTrue))
return;
}
if (yap_flags[WRITE_QUOTED_STRING_FLAG] && IsStringTerm(t)) {
putString(t, wglb);
} else {
wrputc('[', wglb->stream);
lastw = separator;
/* we assume t was already saved in the stack */
write_list(t, 0, depth, wglb, rwt);
wrputc(']', wglb->stream);
lastw = separator;
}
} else { /* compound term */
Functor functor = FunctorOfTerm(t);
int Arity;
Atom atom;
int op, lp, rp;
if (IsExtensionFunctor(functor)) {
switch((CELL)functor) {
case (CELL)FunctorDouble:
wrputf(FloatOfTerm(t),wglb);
return;
case (CELL)FunctorAttVar:
write_var(RepAppl(t)+1, wglb, &nrwt);
return;
case (CELL)FunctorDBRef:
wrputref(RefOfTerm(t), wglb->Quote_illegal, wglb);
return;
case (CELL)FunctorLongInt:
wrputn(LongIntOfTerm(t),wglb);
return;
/* case (CELL)FunctorBigInt: */
default:
writebig(t, p, depth, rinfixarg, wglb, rwt);
return;
}
}
Arity = ArityOfFunctor(functor);
atom = NameOfFunctor(functor);
#ifdef SFUNC
if (Arity == SFArity) {
int argno = 1;
CELL *p = ArgsOfSFTerm(t);
putAtom(atom, wglb->Quote_illegal, wglb);
wropen_bracket(wglb, FALSE);
lastw = separator;
while (*p) {
Int sl = 0;
while (argno < *p) {
wrputc('_', wglb->stream), wrputc(',', wglb->stream);
++argno;
}
*p++;
lastw = separator;
/* cannot use the term directly with the SBA */
writeTerm(from_pointer(p, &nrwt, wglb), 999, depth + 1, FALSE, wglb, &nrwt);
p = restore_from_write(&nrwt, wglb)+1;
if (*p)
wrputc(',', wglb->stream);
argno++;
}
wrclose_bracket(wglb, TRUE);
return;
}
#endif
if (wglb->Use_portray) {
Term targs[1];
struct DB_TERM *old_EX = NULL;
Int sl = 0;
targs[0] = t;
Yap_PutValue(AtomPortray, MkAtomTerm(AtomNil));
if (EX) old_EX = EX;
sl = Yap_InitSlot(t PASS_REGS);
Yap_execute_goal(Yap_MkApplTerm(FunctorPortray, 1, targs),0, 1);
t = Yap_GetFromSlot(sl PASS_REGS);
Yap_RecoverSlots(1 PASS_REGS);
if (old_EX) EX = old_EX;
if (Yap_GetValue(AtomPortray) == MkAtomTerm(AtomTrue) || EX)
return;
}
if (!wglb->Ignore_ops &&
Arity == 1 &&
Yap_IsPrefixOp(atom, &op, &rp)
) {
Term tright = ArgOfTerm(1, t);
int bracket_right =
!IsVarTerm(tright) && IsAtomTerm(tright) &&
Yap_IsOp(AtomOfTerm(tright));
if (op > p) {
wropen_bracket(wglb, TRUE);
}
putAtom(atom, wglb->Quote_illegal, wglb);
if (bracket_right) {
/* avoid stuff such as \+ (a,b) being written as \+(a,b) */
wropen_bracket(wglb, TRUE);
} else if (atom == AtomMinus) {
last_minus = TRUE;
}
writeTerm(from_pointer(RepAppl(t)+1, &nrwt, wglb), rp, depth + 1, TRUE, wglb, &nrwt);
restore_from_write(&nrwt, wglb);
if (bracket_right) {
wrclose_bracket(wglb, TRUE);
}
if (op > p) {
wrclose_bracket(wglb, TRUE);
}
} else if (!wglb->Ignore_ops &&
Arity == 1 &&
Yap_IsPosfixOp(atom, &op, &lp)) {
Term tleft = ArgOfTerm(1, t);
int bracket_left =
!IsVarTerm(tleft) &&
IsAtomTerm(tleft) &&
Yap_IsOp(AtomOfTerm(tleft));
if (op > p) {
/* avoid stuff such as \+ (a,b) being written as \+(a,b) */
wropen_bracket(wglb, TRUE);
}
if (bracket_left) {
wropen_bracket(wglb, TRUE);
}
writeTerm(from_pointer(RepAppl(t)+1, &nrwt, wglb), lp, depth + 1, rinfixarg, wglb, &nrwt);
restore_from_write(&nrwt, wglb);
if (bracket_left) {
wrclose_bracket(wglb, TRUE);
}
putAtom(atom, wglb->Quote_illegal, wglb);
if (op > p) {
wrclose_bracket(wglb, TRUE);
}
} else if (!wglb->Ignore_ops &&
Arity == 2 && Yap_IsInfixOp(atom, &op, &lp,
&rp) ) {
Term tleft = ArgOfTerm(1, t);
Term tright = ArgOfTerm(2, t);
int bracket_left =
!IsVarTerm(tleft) && IsAtomTerm(tleft) &&
Yap_IsOp(AtomOfTerm(tleft));
int bracket_right =
!IsVarTerm(tright) && IsAtomTerm(tright) &&
Yap_IsOp(AtomOfTerm(tright));
if (op > p) {
/* avoid stuff such as \+ (a,b) being written as \+(a,b) */
wropen_bracket(wglb, TRUE);
lastw = separator;
}
if (bracket_left) {
wropen_bracket(wglb, TRUE);
}
writeTerm(from_pointer(RepAppl(t)+1, &nrwt, wglb), lp, depth + 1, rinfixarg, wglb, &nrwt);
t = AbsAppl(restore_from_write(&nrwt, wglb)-1);
if (bracket_left) {
wrclose_bracket(wglb, TRUE);
}
/* avoid quoting commas and bars */
if (!strcmp(RepAtom(atom)->StrOfAE,",")) {
wrputc(',', wglb->stream);
lastw = separator;
} else if (!strcmp(RepAtom(atom)->StrOfAE,"|")) {
wrputc('|', wglb->stream);
lastw = separator;
} else
putAtom(atom, wglb->Quote_illegal, wglb);
if (bracket_right) {
wropen_bracket(wglb, TRUE);
}
writeTerm(from_pointer(RepAppl(t)+2, &nrwt, wglb), rp, depth + 1, TRUE, wglb, &nrwt);
restore_from_write(&nrwt, wglb);
if (bracket_right) {
wrclose_bracket(wglb, TRUE);
}
if (op > p) {
wrclose_bracket(wglb, TRUE);
}
} else if (wglb->Handle_vars && functor == LOCAL_FunctorVar) {
Term ti = ArgOfTerm(1, t);
if (lastw == alphanum) {
wrputc(' ', wglb->stream);
}
if (!IsVarTerm(ti) && (IsIntTerm(ti) || IsStringTerm(ti) || IsAtomTerm(ti))) {
if (IsIntTerm(ti)) {
Int k = IntOfTerm(ti);
if (k == -1) {
wrputc('_', wglb->stream);
lastw = alphanum;
return;
} else {
wrputc((k % 26) + 'A', wglb->stream);
if (k >= 26) {
/* make sure we don't get confused about our context */
lastw = separator;
wrputn( k / 26 ,wglb);
} else
lastw = alphanum;
}
} else if (IsAtomTerm(ti)) {
putAtom(AtomOfTerm(ti), FALSE, wglb);
} else {
putUnquotedString(ti, wglb);
}
} else {
wrputs("'$VAR'(",wglb->stream);
lastw = separator;
writeTerm(from_pointer(RepAppl(t)+1, &nrwt, wglb), 999, depth + 1, FALSE, wglb, &nrwt);
restore_from_write(&nrwt, wglb);
wrclose_bracket(wglb, TRUE);
}
} else if (!wglb->Ignore_ops && functor == FunctorBraces) {
wrputc('{', wglb->stream);
lastw = separator;
writeTerm(from_pointer(RepAppl(t)+1, &nrwt, wglb), 1200, depth + 1, FALSE, wglb, &nrwt);
restore_from_write(&nrwt, wglb);
wrputc('}', wglb->stream);
lastw = separator;
} else if (atom == AtomArray) {
wrputc('{', wglb->stream);
lastw = separator;
for (op = 1; op <= Arity; ++op) {
if (op == wglb->MaxArgs) {
wrputs("...", wglb->stream);
break;
}
writeTerm(from_pointer(RepAppl(t)+op, &nrwt, wglb), 999, depth + 1, FALSE, wglb, &nrwt);
t = AbsAppl(restore_from_write(&nrwt, wglb)-op);
if (op != Arity) {
wrputc(',', wglb->stream);
lastw = separator;
}
}
wrputc('}', wglb->stream);
lastw = separator;
} else {
putAtom(atom, wglb->Quote_illegal, wglb);
lastw = separator;
wropen_bracket(wglb, FALSE);
for (op = 1; op <= Arity; ++op) {
if (op == wglb->MaxArgs) {
wrputc('.', wglb->stream);
wrputc('.', wglb->stream);
wrputc('.', wglb->stream);
break;
}
writeTerm(from_pointer(RepAppl(t)+op, &nrwt, wglb), 999, depth + 1, FALSE, wglb, &nrwt);
restore_from_write(&nrwt, wglb);
if (op != Arity) {
wrputc(',', wglb->stream);
lastw = separator;
}
}
wrclose_bracket(wglb, TRUE);
}
}
}
void
Yap_plwrite(Term t, void *mywrite, int max_depth, int flags, int priority)
/* term to be written */
/* consumer */
/* write options */
{
struct write_globs wglb;
struct rewind_term rwt;
if (!mywrite)
wglb.stream = Serror;
else
wglb.stream = mywrite;
wglb.lw = separator;
wglb.last_atom_minus = FALSE;
wglb.Quote_illegal = flags & Quote_illegal_f;
wglb.Handle_vars = flags & Handle_vars_f;
wglb.Use_portray = flags & Use_portray_f;
wglb.Portray_delays = flags & AttVar_Portray_f;
wglb.MaxDepth = max_depth;
wglb.MaxArgs = max_depth;
/* notice: we must have ASP well set when using portray, otherwise
we cannot make recursive Prolog calls */
wglb.Keep_terms = (flags & (Use_portray_f|To_heap_f));
/* initialise wglb */
rwt.parent = NULL;
wglb.Ignore_ops = flags & Ignore_ops_f;
wglb.Write_strings = flags & BackQuote_String_f;
/* protect slots for portray */
writeTerm(from_pointer(&t, &rwt, &wglb), priority, 1, FALSE, &wglb, &rwt);
restore_from_write(&rwt, &wglb);
}