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yap-6.3/packages/PLStream/pl-write.c

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/* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@cs.vu.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2010, University of Amsterdam
Vu University Amsterdam
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <math.h>
#include "pl-incl.h"
#include "pl-dtoa.h"
#include "pl-ctype.h"
#include <stdio.h> /* sprintf() */
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif
#ifdef HAVE_FLOAT_H
#include <float.h>
#endif
#ifdef HAVE_IEEEFP_H
#include <ieeefp.h>
#endif
#ifdef fpclassify
#define HAVE_FPCLASSIFY 1
#endif
typedef struct visited
{ Word address; /* we have done this address */
struct visited *next; /* next already visited */
} visited;
typedef struct
{ int flags; /* PL_WRT_* flags */
int max_depth; /* depth limit */
int depth; /* current depth */
atom_t spacing; /* Where to insert spaces */
Module module; /* Module for operators */
IOSTREAM *out; /* stream to write to */
visited *visited; /* visited (attributed-) variables */
} write_options;
static bool writeTerm2(term_t term, int prec,
write_options *options, bool arg) WUNUSED;
static bool writeTerm(term_t t, int prec,
write_options *options) WUNUSED;
static bool writeArgTerm(term_t t, int prec,
write_options *options, bool arg) WUNUSED;
#if __YAP_PROLOG__
static Word
address_of(term_t t)
{
return YAP_AddressFromSlot(t); /* non-recursive structure */
}
#else
static Word
address_of(term_t t)
{ GET_LD
Word adr = valTermRef(t);
deRef(adr);
switch(tag(*adr))
{ case TAG_ATTVAR:
return adr;
case TAG_COMPOUND:
return valPtr(*adr);
default:
return NULL; /* non-recursive structure */
}
}
#endif
static int
has_visited(visited *v, Word addr)
{ for( ; v; v=v->next )
{ if ( v->address == addr )
succeed;
}
fail;
}
char *
varName(term_t t, char *name)
#if __YAP_PROLOG__
{
YAP_Int adr = YAP_VarSlotToNumber(t);
if (adr < 0)
Ssprintf(name, "_L%ld", -adr);
else
Ssprintf(name, "_G%ld", adr);
return name;
}
#else
{ GET_LD
Word adr = valTermRef(t);
deRef(adr);
if (adr > (Word) lBase)
Ssprintf(name, "_L%ld", (Word)adr - (Word)lBase);
else
Ssprintf(name, "_G%ld", (Word)adr - (Word)gBase);
return name;
}
#endif
#define AT_LOWER 0
#define AT_QUOTE 1
#define AT_FULLSTOP 2
#define AT_SYMBOL 3
#define AT_SOLO 4
#define AT_SPECIAL 5
/* Note: this only deals with ISO Latin-1 atoms; wide atoms are handled
by writeUCSAtom()
*/
static int
atomType(atom_t a, IOSTREAM *fd)
{ Atom atom = atomValue(a);
char *s = atomName(atom);
size_t len = atomLength(atom);
if ( len == 0 )
return AT_QUOTE;
if ( isLower(*s) )
{ for(++s; --len > 0 && isAlpha(*s) && Scanrepresent(*s, fd)==0; s++)
;
return len == 0 ? AT_LOWER : AT_QUOTE;
}
if ( a == ATOM_dot )
return AT_FULLSTOP;
if ( isSymbol(*s) )
{ if ( len >= 2 && s[0] == '/' && s[1] == '*' )
return AT_QUOTE;
for(++s; --len > 0 && isSymbol(*s) && Scanrepresent(*s, fd)==0; s++)
;
return len == 0 ? AT_SYMBOL : AT_QUOTE;
}
/* % should be quoted! */
if ( len == 1 && *s != '%' )
{ if ( isSolo(*s) )
return AT_SOLO;
}
if ( a == ATOM_nil || a == ATOM_curl )
return AT_SPECIAL;
return AT_QUOTE;
}
/*******************************
* PRIMITIVE WRITES *
*******************************/
#define TRUE_WITH_SPACE 2 /* OK, and emitted leading space before token */
static bool
Putc(int c, IOSTREAM *s)
{ return Sputcode(c, s) == EOF ? FALSE : TRUE;
}
static bool
PutString(const char *str, IOSTREAM *s)
{ const unsigned char *q = (const unsigned char *)str;
for( ; *q != EOS; q++ )
{ if ( Sputcode(*q, s) == EOF )
return FALSE;
}
return TRUE;
}
static bool
PutComma(write_options *options)
{ if ( options->spacing == ATOM_next_argument )
return PutString(", ", options->out);
else
return PutString(",", options->out);
}
static bool
PutStringN(const char *str, size_t length, IOSTREAM *s)
{ size_t i;
const unsigned char *q = (const unsigned char *)str;
for(i=0; i<length; i++, q++)
{ if ( Sputcode(*q, s) == EOF )
return FALSE;
}
return TRUE;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
PutOpenToken() inserts a space in the output stream if the last-written
and given character require a space to ensure a token-break.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static bool
needSpace(int c, IOSTREAM *s)
{ if ( c == EOF )
{ s->lastc = EOF;
return FALSE;
} else if ( s->lastc != EOF &&
((isAlphaW(s->lastc) && isAlphaW(c)) ||
(isSymbolW(s->lastc) && isSymbolW(c)) ||
(s->lastc != '(' && !isBlank(s->lastc) && c == '(') ||
(c == '\'' && isDigit(s->lastc))) )
{ return TRUE;
}
return FALSE;
}
static int
PutOpenToken(int c, IOSTREAM *s)
{ if ( needSpace(c, s) )
{ TRY(Putc(' ', s));
return TRUE_WITH_SPACE;
}
return TRUE;
}
static int
PutToken(const char *s, IOSTREAM *stream)
{ if ( s[0] )
{ int rc;
TRY(rc=PutOpenToken(s[0]&0xff, stream));
TRY(PutString(s, stream));
return rc;
}
return TRUE;
}
static int
PutTokenN(const char *s, size_t len, IOSTREAM *stream)
{ if ( len > 0 )
{ int rc;
TRY(rc=PutOpenToken(s[0]&0xff, stream));
TRY(PutStringN(s, len, stream));
return rc;
}
return TRUE;
}
#if __YAP_PROLOG__
static bool
PutWideStringN(const wchar_t *str, size_t length, IOSTREAM *s)
{ size_t i;
const wchar_t *q = (const wchar_t *)str;
for(i=0; i<length; i++, q++)
{ if ( Sputcode(*q, s) == EOF )
return FALSE;
}
return TRUE;
}
static bool
PutWideString(const wchar_t *str, IOSTREAM *s)
{ const wchar_t *q = (const wchar_t *)str;
for( ; *q != EOS; q++ )
{ if ( Sputcode(*q, s) == EOF )
return FALSE;
}
return TRUE;
}
static int
PutWideToken(const wchar_t *s, IOSTREAM *stream)
{ if ( s[0] )
{ int rc;
TRY(rc=PutOpenToken(s[0]&0xff, stream));
TRY(PutWideString(s, stream));
return rc;
}
return TRUE;
}
static int
PutWideTokenN(const wchar_t *s, size_t len, IOSTREAM *stream)
{ if ( len > 0 )
{ int rc;
TRY(rc=PutOpenToken(s[0]&0xff, stream));
TRY(PutWideStringN(s, len, stream));
return rc;
}
return TRUE;
}
#endif
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
PutOpenBrace()/PutCloseBrace() are used to put additional braces around
a term to avoid an operator precedence problem. If the last emitted
character is alphanumerical, there should be a space before the
openbrace to avoid interpretation as a term. E.g. not (a,b) instead of
not(a,b). Reported by Stefan.Mueller@dfki.de.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static int
PutOpenBrace(IOSTREAM *s)
{ int rc;
TRY(rc=PutOpenToken('(', s));
TRY(Putc('(', s));
return rc;
}
static bool
PutCloseBrace(IOSTREAM *s)
{ return Putc(')', s);
}
static bool
putQuoted(int c, int quote, int flags, IOSTREAM *stream)
{ if ( (flags & PL_WRT_CHARESCAPES) )
{ if ( !(c < 0xff && isControl(c)) && c != quote && c != '\\' )
{ TRY(Putc(c, stream));
} else
{ char esc[8];
esc[1] = EOS;
if ( c == quote )
{ esc[0] = c;
} else
{ switch(c)
{ case 7:
esc[0] = 'a';
break;
case '\b':
esc[0] = 'b';
break;
case '\t':
esc[0] = 't';
break;
case '\n':
esc[0] = 'n';
break;
case 11:
esc[0] = 'v';
break;
case '\r':
esc[0] = 'r';
break;
case '\f':
esc[0] = 'f';
break;
case '\\':
esc[0] = '\\';
break;
default:
if ( c <= 0xff )
Ssprintf(esc, "%03o\\", c);
else
assert(0); /* to be done */
}
}
if ( !Putc('\\', stream) ||
!PutString(esc, stream) )
fail;
}
} else
{ if ( !Putc(c, stream) )
fail;
if ( c == quote || c == '\\' ) /* write '' or \\ */
{ if ( !Putc(c, stream) )
fail;
}
}
return TRUE;
}
static bool
writeQuoted(IOSTREAM *stream, const char *text, size_t len, int quote,
write_options *options)
{ const unsigned char *s = (const unsigned char *)text;
TRY(Putc(quote, stream));
while(len-- > 0)
{ TRY(putQuoted(*s++, quote, options->flags, stream));
}
return Putc(quote, stream);
}
#if O_ATTVAR
static bool
writeAttVar(term_t av, write_options *options)
{ GET_LD
char buf[32];
TRY(PutToken(varName(av, buf), options->out));
if ( (options->flags & PL_WRT_ATTVAR_DOTS) )
{ return PutString("{...}", options->out);
} else if ( (options->flags & PL_WRT_ATTVAR_WRITE) )
{ fid_t fid;
term_t a;
visited v;
if ( !(fid = PL_open_foreign_frame()) )
return FALSE;
v.address = address_of(av);
if ( has_visited(options->visited, v.address) )
succeed;
v.next = options->visited;
options->visited = &v;
Sputcode('{', options->out);
a = PL_new_term_ref();
PL_get_attr__LD(av, a PASS_LD);
if ( !writeTerm(a, 1200, options) )
goto error;
Sputcode('}', options->out);
PL_discard_foreign_frame(fid);
options->visited = v.next;
succeed;
error:
options->visited = v.next;
fail;
} else if ( (options->flags & PL_WRT_ATTVAR_PORTRAY) &&
GD->cleaning <= CLN_PROLOG )
{ fid_t fid;
predicate_t pred;
IOSTREAM *old;
if ( !(fid = PL_open_foreign_frame()) )
return FALSE;
pred = _PL_predicate("portray_attvar", 1, "$attvar",
&GD->procedures.portray_attvar1);
old = Scurout;
Scurout = options->out;
PL_call_predicate(NULL, PL_Q_NODEBUG, pred, av);
Scurout = old;
PL_discard_foreign_frame(fid);
}
succeed;
}
#endif
static bool
writeBlob(atom_t a, write_options *options)
{ Atom atom = atomValue(a);
unsigned char const *s, *e;
TRY(PutString("<#", options->out));
s = (unsigned char const *)atomName(atom);
for (e = s + atomLength(atom); s != e; s++)
{ static char *digits = "0123456789abcdef";
TRY(Putc(digits[(*s >> 4) & 0xf], options->out));
TRY(Putc(digits[(*s ) & 0xf], options->out));
}
return PutString(">", options->out);
}
static int /* FALSE, TRUE or TRUE_WITH_SPACE */
writeAtom(atom_t a, write_options *options)
{ Atom atom = atomValue(a);
if ( (options->flags & PL_WRT_BLOB_PORTRAY) &&
false(atomBlobType(atom), PL_BLOB_TEXT) &&
GD->cleaning <= CLN_PROLOG )
{ GET_LD
int rc;
fid_t fid;
predicate_t pred;
IOSTREAM *old;
term_t av;
if ( !(fid = PL_open_foreign_frame()) )
return FALSE;
av = PL_new_term_ref();
PL_put_atom(av, a);
pred = _PL_predicate("portray", 1, "user",
&GD->procedures.portray);
old = Scurout;
Scurout = options->out;
rc = PL_call_predicate(NULL, PL_Q_NODEBUG, pred, av);
Scurout = old;
PL_discard_foreign_frame(fid);
if ( rc == TRUE )
return TRUE;
}
if ( atomBlobType(atom)->write )
return (*atomBlobType(atom)->write)(options->out, a, options->flags);
if ( false(atomBlobType(atom), PL_BLOB_TEXT) )
return writeBlob(a, options);
if ( true(options, PL_WRT_QUOTED) )
{ switch( atomType(a, options->out) )
{ case AT_LOWER:
case AT_SYMBOL:
case AT_SOLO:
case AT_SPECIAL:
#if __YAP_PROLOG__
if (isWideAtom(atom)) {
return PutWideToken(nameOfWideAtom(atom), options->out);
}
#endif
return PutToken(nameOfAtom(atom), options->out);
case AT_QUOTE:
case AT_FULLSTOP:
default:
{ int rc;
TRY(rc=PutOpenToken('\'', options->out));
TRY(writeQuoted(options->out,
nameOfAtom(atom),
atomLength(atom),
'\'', options));
return rc;
}
}
} else {
#if __YAP_PROLOG__
if (isWideAtom(atom)) {
return PutWideTokenN(nameOfWideAtom(atom), atomLength(atom), options->out);
}
#endif
return PutTokenN(nameOfAtom(atom), atomLength(atom), options->out);
}
}
int
writeAtomToStream(IOSTREAM *s, atom_t atom)
{ write_options options;
memset(&options, 0, sizeof(options));
options.out = s;
options.module = MODULE_user;
return writeAtom(atom, &options);
}
int
writeUCSAtom(IOSTREAM *fd, atom_t atom, int flags)
{ Atom a = atomValue(atom);
pl_wchar_t *s = (pl_wchar_t*)atomName(a);
size_t len = atomLength(a)/sizeof(pl_wchar_t);
pl_wchar_t *e = &s[len];
if ( flags & PL_WRT_QUOTED )
{ pl_wchar_t quote = L'\'';
int rc;
if ( isLowerW(*s) )
{ pl_wchar_t *q;
for(q=s; q<e; q++)
{ if ( !isAlphaW(*q) || Scanrepresent(*q, fd) < 0 )
break;
}
if ( q == e )
goto unquoted;
}
TRY(Putc(quote, fd));
while(s < e)
{ TRY(putQuoted(*s++, quote, flags, fd));
}
rc = Putc(quote, fd);
return rc;
}
unquoted:
if ( s < e && !PutOpenToken(s[0], fd) )
return FALSE;
for( ; s<e; s++)
{ if ( !Putc(*s, fd) )
return FALSE;
}
return TRUE;
}
#if O_STRING
static inline int
get_chr_from_text(const PL_chars_t *t, int index)
{ switch(t->encoding)
{ case ENC_ISO_LATIN_1:
return t->text.t[index]&0xff;
case ENC_WCHAR:
return t->text.w[index];
default:
assert(0);
return 0;
}
}
static int
writeString(term_t t, write_options *options)
{ GET_LD
PL_chars_t txt;
PL_get_text(t, &txt, CVT_STRING);
if ( true(options, PL_WRT_QUOTED) )
{ int quote;
unsigned int i;
if ( true(options, PL_WRT_BACKQUOTED_STRING) )
quote = '`';
else
quote = '"';
TRY(Putc(quote, options->out));
for(i=0; i<txt.length; i++)
{ int chr = get_chr_from_text(&txt, i);
TRY(putQuoted(chr, quote, options->flags, options->out));
}
return Putc(quote, options->out);
} else
{ unsigned int i;
for(i=0; i<txt.length; i++)
{ int chr = get_chr_from_text(&txt, i);
TRY(Putc(chr, options->out));
}
}
succeed;
}
#endif /*O_STRING*/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Formatting a float. This used to use sprintf(), but there are two
problems with this. First of all, this uses the current locale, which is
complicated to avoid. Second, it does not provide a mode that guarantees
reliable read-back. Using %g gets closest, but %.15g doesn't guarantee
read-back and %.17g does, but prints 0.1 as 0.100..001, etc.
This uses dtoa.c. See pl-dtoa.c for how this is packed into SWI-Prolog.
TBD: The number of cases are large. We should see whether it is possible
to clean this up a bit. The 5 cases as such are real: there is no way
around these.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
char *
format_float(double f, char *buf)
{ char *end, *o=buf;
int decpt, sign;
char *s = dtoa(f, 0, 30, &decpt, &sign, &end);
DEBUG(2, Sdprintf("decpt=%d, sign=%d, len = %d, '%s'\n",
decpt, sign, end-s, s));
if ( sign )
*o++ = '-';
if ( decpt <= 0 ) /* decimal dot before */
{ if ( decpt <= -4 )
{ *o++ = s[0];
*o++ = '.';
if ( end-s > 1 )
{ memcpy(o, s+1, end-s-1);
o += end-s-1;
} else
*o++ = '0';
sprintf(o, "e%d", decpt-1);
} else
{ int i;
*o++ = '0';
*o++ = '.';
for(i=0; i < -decpt; i++)
*o++ = '0';
memcpy(o, s, end-s);
o[end-s] = 0;
}
} else if ( end-s > decpt ) /* decimal dot inside */
{ memcpy(o, s, decpt);
o += decpt;
*o++ = '.';
memcpy(o, s+decpt, end-s-decpt);
o[end-s-decpt] = 0;
} else /* decimal dot after */
{ int i;
int trailing = decpt-(int)(end-s);
if ( decpt > 15 ) /* over precision: use eE */
{ *o++ = s[0];
*o++ = '.';
if ( end-s > 1 )
{ trailing += (int)(end-s)-1;
memcpy(o, s+1, end-s-1);
o += end-s-1;
} else
*o++ = '0';
sprintf(o, "e+%d", trailing);
} else /* within precision trail with .0 */
{ memcpy(o, s, end-s);
o += end-s;
for(i=(int)(end-s); i<decpt; i++)
*o++ = '0';
*o++ = '.';
*o++ = '0';
*o = 0;
}
}
freedtoa(s);
return buf;
}
static bool
WriteNumber(Number n, write_options *options)
{ GET_LD
switch(n->type)
{ case V_INTEGER:
{ char buf[32];
sprintf(buf, INT64_FORMAT, n->value.i);
return PutToken(buf, options->out);
}
#ifdef O_GMP
case V_MPZ:
{ char tmp[1024];
char *buf;
size_t sz = mpz_sizeinbase(n->value.mpz, 10) + 2;
bool rc;
if ( sz <= sizeof(tmp) )
buf = tmp;
else
buf = PL_malloc(sz);
/* mpz_get_str() can perform large intermediate allocations :-( */
EXCEPTION_GUARDED({ LD->gmp.persistent++;
mpz_get_str(buf, 10, n->value.mpz);
LD->gmp.persistent--;
},
{ LD->gmp.persistent--;
rc = PL_rethrow();
})
rc = PutToken(buf, options->out);
if ( buf != tmp )
PL_free(buf);
return rc;
}
case V_MPQ: /* should not get here */
#endif
case V_FLOAT:
assert(0);
}
fail;
}
static bool
writePrimitive(term_t t, write_options *options)
{ GET_LD
double f;
atom_t a;
char buf[32];
IOSTREAM *out = options->out;
#if O_ATTVAR
if ( PL_is_attvar(t) )
return writeAttVar(t, options);
#endif
if ( PL_is_variable(t) )
return PutToken(varName(t, buf), out);
if ( PL_get_atom(t, &a) )
return writeAtom(a, options);
if ( PL_is_integer(t) ) /* beware of automatic conversion */
{ number n;
PL_get_number(t, &n);
return WriteNumber(&n, options);
}
if ( PL_get_float(t, &f) )
{ char *s = NULL;
#ifdef HAVE_FPCLASSIFY
switch(fpclassify(f))
{ case FP_NAN:
s = (true(options, PL_WRT_QUOTED) ? "'$NaN'" : "NaN");
break;
case FP_INFINITE:
s = (true(options, PL_WRT_QUOTED) ? "'$Infinity'" : "Infinity");
break;
}
#else
#ifdef HAVE_FPCLASS
switch(fpclass(f))
{ case FP_SNAN:
case FP_QNAN:
s = (true(options, PL_WRT_QUOTED) ? "'$NaN'" : "NaN");
break;
case FP_NINF:
case FP_PINF:
s = (true(options, PL_WRT_QUOTED) ? "'$Infinity'" : "Infinity");
break;
case FP_NDENORM: /* pos/neg denormalized non-zero */
case FP_PDENORM:
case FP_NNORM: /* pos/neg normalized non-zero */
case FP_PNORM:
case FP_NZERO: /* pos/neg zero */
case FP_PZERO:
break;
}
#else
#ifdef HAVE__FPCLASS
switch(_fpclass(f))
{ case _FPCLASS_SNAN:
case _FPCLASS_QNAN:
s = (true(options, PL_WRT_QUOTED) ? "'$NaN'" : "NaN");
break;
case _FPCLASS_NINF:
case _FPCLASS_PINF:
s = (true(options, PL_WRT_QUOTED) ? "'$Infinity'" : "Infinity");
break;
}
#else
#ifdef HAVE_ISINF
if ( isinf(f) )
{ s = (true(options, PL_WRT_QUOTED) ? "'$Infinity'" : "Infinity");
} else
#endif
#ifdef HAVE_ISNAN
if ( isnan(f) )
{ s = (true(options, PL_WRT_QUOTED) ? "'$NaN'" : "NaN");
}
#endif
#endif /*HAVE__FPCLASS*/
#endif /*HAVE_FPCLASS*/
#endif /*HAVE_FPCLASSIFY*/
if ( s )
{ return PutToken(s, out);
} else
{ char buf[100];
format_float(f, buf);
return PutToken(buf, out);
}
}
#if O_STRING
if ( PL_is_string(t) )
return writeString(t, options);
#endif /* O_STRING */
#if __YAP_PROLOG__
{
Opaque_CallOnWrite f;
if ( (f = Yap_blob_write_handler_from_slot(t)) ) {
return (f)(options->out, Yap_blob_tag_from_slot(t), Yap_blob_info_from_slot(t), options->flags);
} else {
number n;
n.type = V_INTEGER;
n.value.i = 0;
return WriteNumber(&n, options);
}
}
#endif
assert(0);
fail;
}
word
pl_nl1(term_t stream)
{ IOSTREAM *s;
if ( getOutputStream(stream, &s) )
{ Sputcode('\n', s);
return streamStatus(s);
}
fail;
}
word
pl_nl(void)
{ return pl_nl1(0);
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Call user:portray/1 if defined.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static int
callPortray(term_t arg, write_options *options)
{ predicate_t portray;
if ( GD->cleaning > CLN_PROLOG )
fail; /* avoid dangerous callbacks */
portray = _PL_predicate("portray", 1, "user", &GD->procedures.portray);
if ( predicateHasClauses(portray) )
{ GET_LD
wakeup_state wstate;
IOSTREAM *old = Scurout;
int rval;
if ( !saveWakeup(&wstate, TRUE PASS_LD) )
return FALSE;
Scurout = options->out;
rval = PL_call_predicate(NULL, PL_Q_NODEBUG|PL_Q_PASS_EXCEPTION,
portray, arg);
if ( !rval && PL_exception(0) )
rval = -1;
Scurout = old;
restoreWakeup(&wstate PASS_LD);
return rval;
}
fail;
}
static bool
writeArgTerm(term_t t, int prec, write_options *options, bool arg)
{ int rval;
int levelSave = options->depth;
fid_t fid;
if ( !(fid = PL_open_foreign_frame()) )
return FALSE;
if ( PL_handle_signals() < 0 )
{ rval = FALSE;
goto out;
}
if ( ++options->depth > options->max_depth && options->max_depth )
rval = PutString("...", options->out);
else if ( PL_is_compound(t) )
{ visited v;
v.address = address_of(t);
if ( has_visited(options->visited, v.address) )
{ rval = PutString("**", options->out);
} else
{ v.next = options->visited;
options->visited = &v;
rval = writeTerm2(t, prec, options, arg);
options->visited = v.next;
}
} else
{ rval = writeTerm2(t, prec, options, arg);
}
out:
options->depth = levelSave;
PL_close_foreign_frame(fid);
return rval;
}
static bool
writeTerm(term_t t, int prec, write_options *options)
{
return writeArgTerm(t, prec, options, FALSE);
}
static bool
writeList2(term_t list, write_options *options, int cyclic)
{ GET_LD
term_t head = PL_new_term_ref();
term_t l = PL_copy_term_ref(list);
TRY(Putc('[', options->out));
for(;;)
{ PL_get_list(l, head, l);
TRY(writeArgTerm(head, 999, options, TRUE));
if ( PL_get_nil(l) )
break;
if ( ++options->depth >= options->max_depth && options->max_depth )
return PutString("|...]", options->out);
if ( !PL_is_functor(l, FUNCTOR_dot2) )
{ TRY(Putc('|', options->out));
TRY(writeArgTerm(l, 999, options, TRUE));
break;
}
/* cycle detection */
{ Word addr = address_of(l);
if ( has_visited(options->visited, addr) )
{ return PutString("|**]", options->out);
} else if ( cyclic )
{ visited *v = alloca(sizeof(*v));
v->address = addr;
v->next = options->visited;
options->visited = v;
}
}
TRY(PutComma(options));
}
return Putc(']', options->out);
}
static bool
writeList(term_t list, write_options *options)
{ GET_LD
visited *v = options->visited;
Word tail;
int rc;
skip_list(valTermRef(list), &tail PASS_LD);
rc = writeList2(list, options, isList(*tail));
options->visited = v;
return rc;
}
static bool
writeTerm2(term_t t, int prec, write_options *options, bool arg)
{ GET_LD
atom_t functor;
int arity, n;
int op_type, op_pri;
atom_t a;
IOSTREAM *out = options->out;
if ( !PL_is_variable(t) &&
true(options, PL_WRT_PORTRAY) )
{ switch( callPortray(t, options) )
{ case TRUE:
return TRUE;
case FALSE:
break;
default:
return FALSE;
}
}
#if __YAP_PROLOG__
t = Yap_CvtTerm(t);
#endif
if ( PL_get_atom(t, &a) )
{ if ( !arg && prec < 1200 && priorityOperator((Module)NULL, a) > 0 )
{ if ( PutOpenBrace(out) &&
writeAtom(a, options) &&
PutCloseBrace(out) )
succeed;
} else
return writeAtom(a, options);
}
if ( !PL_get_name_arity(t, &functor, &arity) )
{ return writePrimitive(t, options);
} else
{ if ( arity == 1 &&
functor == ATOM_isovar && /* $VAR/1 */
true(options, PL_WRT_NUMBERVARS) )
{ int n;
atom_t a;
term_t arg = PL_new_term_ref();
_PL_get_arg(1, t, arg);
#if __YAP_PROLOG__
/* YAP supports $VAR(-1) as a quick hack to write singleton variables */
#define MIN_DOLLAR_VAR -1
#else
#define MIN_DOLLAR_VAR 0
#endif
if ( PL_get_integer(arg, &n) && n >= MIN_DOLLAR_VAR )
{ int i = n % 26;
int j = n / 26;
char buf[16];
#if __YAP_PROLOG__
if ( n == -1 ) {
buf[0] = '_';
buf[1] = EOS;
} else
#endif
if ( j == 0 )
{ buf[0] = i+'A';
buf[1] = EOS;
} else
{ sprintf(buf, "%c%d", i+'A', j);
}
return PutToken(buf, out);
}
if ( PL_get_atom(arg, &a) )
{ write_options o2 = *options;
clear(&o2, PL_WRT_QUOTED);
return writeAtom(a, &o2);
}
}
if ( false(options, PL_WRT_IGNOREOPS) )
{ term_t arg = PL_new_term_ref();
if ( arity == 1 )
{ if ( functor == ATOM_curl ) /* {a,b,c} */
{ _PL_get_arg(1, t, arg);
TRY(Putc('{', out));
TRY(writeTerm(arg, 1200, options) &&
Putc('}', out));
succeed;
}
/* op <term> */
if ( currentOperator(options->module, functor, OP_PREFIX,
&op_type, &op_pri) )
{ term_t arg = PL_new_term_ref();
int embrace;
embrace = ( op_pri > prec );
_PL_get_arg(1, t, arg);
if ( embrace )
{ TRY(PutOpenBrace(out));
}
TRY(writeAtom(functor, options));
/* +/-(Number) : avoid parsing as number */
if ( (functor == ATOM_minus || functor == ATOM_plus) &&
PL_is_number(arg) )
{ TRY(Putc('(', out));
TRY(writeTerm(arg, 999, options));
TRY(Putc(')', out));
} else
{ TRY(writeTerm(arg,
op_type == OP_FX ? op_pri-1 : op_pri,
options));
}
if ( embrace )
{ TRY(PutCloseBrace(out));
}
succeed;
}
/* <term> op */
if ( currentOperator(options->module, functor, OP_POSTFIX,
&op_type, &op_pri) )
{ term_t arg = PL_new_term_ref();
_PL_get_arg(1, t, arg);
if ( op_pri > prec )
TRY(PutOpenBrace(out));
TRY(writeTerm(arg,
op_type == OP_XF ? op_pri-1 : op_pri,
options));
TRY(writeAtom(functor, options));
if (op_pri > prec)
TRY(PutCloseBrace(out));
succeed;
}
} else if ( arity == 2 )
{ if ( functor == ATOM_dot ) /* [...] */
return writeList(t, options);
/* <term> op <term> */
if ( currentOperator(options->module, functor, OP_INFIX,
&op_type, &op_pri) )
{ term_t l = PL_new_term_ref();
term_t r = PL_new_term_ref();
_PL_get_arg(1, t, l);
_PL_get_arg(2, t, r);
if ( op_pri > prec )
TRY(PutOpenBrace(out));
TRY(writeTerm(l,
op_type == OP_XFX || op_type == OP_XFY
? op_pri-1 : op_pri,
options));
if ( functor == ATOM_comma )
{ TRY(PutComma(options));
} else
{ switch(writeAtom(functor, options))
{ case FALSE:
fail;
case TRUE_WITH_SPACE:
TRY(Putc(' ', out));
}
}
TRY(writeTerm(r,
op_type == OP_XFX || op_type == OP_YFX
? op_pri-1 : op_pri,
options));
if ( op_pri > prec )
TRY(PutCloseBrace(out));
succeed;
}
}
}
/* functor(<args> ...) */
{ term_t a = PL_new_term_ref();
TRY(writeAtom(functor, options) &&
Putc('(', out));
for(n=0; n<arity; n++)
{ if (n > 0)
TRY(PutComma(options));
_PL_get_arg(n+1, t, a);
TRY(writeArgTerm(a, 999, options, TRUE));
}
return Putc(')', out);
}
}
}
int
writeAttributeMask(atom_t a)
{ if ( a == ATOM_ignore )
{ return PL_WRT_ATTVAR_IGNORE;
} else if ( a == ATOM_dots )
{ return PL_WRT_ATTVAR_DOTS;
} else if ( a == ATOM_write )
{ return PL_WRT_ATTVAR_WRITE;
} else if ( a == ATOM_portray )
{ return PL_WRT_ATTVAR_PORTRAY;
} else
return 0;
}
static int
writeBlobMask(atom_t a)
{ if ( a == ATOM_default )
{ return 0;
} else if ( a == ATOM_portray )
{ return PL_WRT_BLOB_PORTRAY;
} else
return -1;
}
static const opt_spec write_term_options[] =
{ { ATOM_quoted, OPT_BOOL },
{ ATOM_ignore_ops, OPT_BOOL },
{ ATOM_numbervars, OPT_BOOL },
{ ATOM_portray, OPT_BOOL },
{ ATOM_character_escapes, OPT_BOOL },
{ ATOM_max_depth, OPT_INT },
{ ATOM_module, OPT_ATOM },
{ ATOM_backquoted_string, OPT_BOOL },
{ ATOM_attributes, OPT_ATOM },
{ ATOM_priority, OPT_INT },
{ ATOM_partial, OPT_BOOL },
{ ATOM_spacing, OPT_ATOM },
{ ATOM_blobs, OPT_ATOM },
{ NULL_ATOM, 0 }
};
word
pl_write_term3(term_t stream, term_t term, term_t opts)
{ GET_LD
bool quoted = FALSE;
bool ignore_ops = FALSE;
bool numbervars = -1; /* not set */
bool portray = FALSE;
bool bqstring = truePrologFlag(PLFLAG_BACKQUOTED_STRING);
bool charescape = -1; /* not set */
atom_t mname = ATOM_user;
atom_t attr = ATOM_nil;
atom_t blobs = ATOM_nil;
int priority = 1200;
bool partial = FALSE;
IOSTREAM *s;
write_options options;
int rc;
memset(&options, 0, sizeof(options));
options.spacing = ATOM_standard;
if ( !scan_options(opts, 0, ATOM_write_option, write_term_options,
&quoted, &ignore_ops, &numbervars, &portray,
&charescape, &options.max_depth, &mname,
&bqstring, &attr, &priority, &partial, &options.spacing,
&blobs) )
fail;
if ( attr == ATOM_nil )
{ options.flags |= LD->prolog_flag.write_attributes;
} else
{ int mask = writeAttributeMask(attr);
if ( !mask )
return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_write_option, opts);
options.flags |= mask;
}
if ( blobs != ATOM_nil )
{ int mask = writeBlobMask(blobs);
if ( mask < 0 )
return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_write_option, opts);
options.flags |= mask;
}
if ( priority < 0 || priority > OP_MAXPRIORITY )
{ term_t t = PL_new_term_ref();
PL_put_integer(t, priority);
return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_operator_priority, t);
}
switch( options.spacing )
{ case ATOM_standard:
case ATOM_next_argument:
break;
default:
{ term_t t = PL_new_term_ref();
PL_put_atom(t, options.spacing);
return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_spacing, t);
}
}
if ( !getOutputStream(stream, &s) )
fail;
options.module = lookupModule(mname);
if ( charescape == TRUE ||
// (charescape == -1 && true(options.module, CHARESCAPE)) )
charEscapeWriteOption(options))
options.flags |= PL_WRT_CHARESCAPES;
if ( numbervars == -1 )
numbervars = (portray ? TRUE : FALSE);
if ( quoted ) options.flags |= PL_WRT_QUOTED;
if ( ignore_ops ) options.flags |= PL_WRT_IGNOREOPS;
if ( numbervars ) options.flags |= PL_WRT_NUMBERVARS;
if ( portray ) options.flags |= PL_WRT_PORTRAY;
if ( bqstring ) options.flags |= PL_WRT_BACKQUOTED_STRING;
options.out = s;
if ( !partial )
PutOpenToken(EOF, s); /* reset this */
if ( (options.flags & PL_WRT_QUOTED) && !(s->flags&SIO_REPPL) )
{ s->flags |= SIO_REPPL;
rc = writeTerm(term, priority, &options);
s->flags &= ~SIO_REPPL;
} else
{ rc = writeTerm(term, priority, &options);
}
return streamStatus(s) && rc;
}
word
pl_write_term(term_t term, term_t options)
{ return pl_write_term3(0, term, options);
}
int
PL_write_term(IOSTREAM *s, term_t term, int precedence, int flags)
{ write_options options;
memset(&options, 0, sizeof(options));
options.flags = flags;
options.out = s;
options.module = MODULE_user;
PutOpenToken(EOF, s); /* reset this */
return writeTerm(term, precedence, &options);
}
static word
do_write2(term_t stream, term_t term, int flags)
{ GET_LD
IOSTREAM *s;
if ( getOutputStream(stream, &s) )
{ write_options options;
int rc;
memset(&options, 0, sizeof(options));
options.flags = flags;
options.out = s;
options.module = MODULE_user;
// if ( options.module && true(options.module, CHARESCAPE) )
if (charEscapeWriteOption(options))
options.flags |= PL_WRT_CHARESCAPES;
if ( truePrologFlag(PLFLAG_BACKQUOTED_STRING) )
options.flags |= PL_WRT_BACKQUOTED_STRING;
PutOpenToken(EOF, s); /* reset this */
rc = writeTerm(term, 1200, &options);
return streamStatus(s) && rc;
}
return FALSE;
}
word
pl_write2(term_t stream, term_t term)
{ return do_write2(stream, term, PL_WRT_NUMBERVARS);
}
word
pl_writeq2(term_t stream, term_t term)
{ return do_write2(stream, term, PL_WRT_QUOTED|PL_WRT_NUMBERVARS);
}
word
pl_print2(term_t stream, term_t term)
{ return do_write2(stream, term,
PL_WRT_PORTRAY|PL_WRT_NUMBERVARS);
}
word
pl_write_canonical2(term_t stream, term_t term)
{ GET_LD
fid_t fid;
nv_options options;
word rc;
if ( !(fid = PL_open_foreign_frame()) )
return FALSE;
options.functor = FUNCTOR_isovar1;
options.on_attvar = AV_SKIP;
options.singletons = TRUE;
numberVars(term, &options, 0 PASS_LD);
rc = do_write2(stream, term,
PL_WRT_QUOTED|PL_WRT_IGNOREOPS|PL_WRT_NUMBERVARS);
PL_discard_foreign_frame(fid);
return rc;
}
word
pl_write(term_t term)
{ return pl_write2(0, term);
}
word
pl_writeq(term_t term)
{ return pl_writeq2(0, term);
}
word
pl_print(term_t term)
{ return pl_print2(0, term);
}
word
pl_write_canonical(term_t term)
{ return pl_write_canonical2(0, term);
}
word /* for debugging purposes! */
pl_writeln(term_t term)
{ if ( PL_write_term(Serror, term, 1200,
PL_WRT_QUOTED|PL_WRT_NUMBERVARS) &&
Sdprintf("\n") >= 0 )
succeed;
fail;
}
static
PRED_IMPL("$put_token", 2, put_token, 0)
{ char *s;
size_t len;
IOSTREAM *out;
if ( !PL_get_stream_handle(A1, &out) )
fail;
if ( !PL_get_nchars(A2, &len, &s, CVT_ATOM|CVT_STRING|CVT_EXCEPTION) )
fail;
if ( PutTokenN(s, len, out) )
return PL_release_stream(out);
PL_release_stream(out);
fail;
}
/*******************************
* PUBLISH PREDICATES *
*******************************/
BeginPredDefs(write)
PRED_DEF("$put_token", 2, put_token, 0)
EndPredDefs
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