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/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@cs.vu.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2012, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "pl-incl.h"
#include <math.h>
#include "os/pl-dtoa.h"
#include "os/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
{ 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 */
term_t portray_goal; /* call/2 activated portray hook */
term_t write_options; /* original write options */
term_t prec_opt; /* term in write options with prec */
} 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;
static int PutToken(const char *s, IOSTREAM *stream);
static int writeAtom(atom_t a, write_options *options);
static int callPortray(term_t arg, int prec, write_options *options);
char *
varName(term_t t, char *name)
{ 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;
}
static int
atomIsVarName(atom_t a)
{ Atom atom = atomValue(a);
if ( false(atom->type, PL_BLOB_TEXT) || atom->length == 0 )
fail;
if ( isUCSAtom(atom) )
{ pl_wchar_t *w = (pl_wchar_t*)atom->name;
size_t len = atom->length / sizeof(pl_wchar_t);
return atom_varnameW(w, len);
} else
{ const char *s = atom->name;
size_t len = atom->length;
if ( isUpper(*s) || *s == '_' )
{ for(s++; --len > 0; s++)
{ if ( !isAlpha(*s) )
return FALSE;
}
return TRUE;
}
return FALSE;
}
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Return: TRUE: processes
FALSE: not processed
-1: error
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static int
writeNumberVar(term_t t, write_options *options ARG_LD)
{ Word p = valTermRef(t);
Functor f;
deRef(p);
if ( !isTerm(*p) )
return FALSE;
f = valueTerm(*p);
if ( f->definition != FUNCTOR_isovar1 )
return FALSE;
if ( LD->var_names.numbervars_frame )
{ FliFrame fr = (FliFrame)valTermRef(LD->var_names.numbervars_frame);
assert(fr->magic == FLI_MAGIC);
if ( fr->mark.globaltop > (Word)f )
return FALSE; /* older $VAR term */
}
p = &f->arguments[0];
deRef(p);
if ( isInteger(*p) )
{ int64_t n = valInteger(*p);
char buf[32]; /* Max is H354745078340568300 */
if ( n < 0 )
{ sprintf(buf, "S_" INT64_FORMAT, -n);
} else
{ int i = (int)(n % 26);
int64_t j = n / 26;
if ( j == 0 )
{ buf[0] = i+'A';
buf[1] = EOS;
} else
{ sprintf(buf, "%c" INT64_FORMAT, i+'A', j);
}
}
return PutToken(buf, options->out) ? TRUE : -1;
}
if ( isAtom(*p) && atomIsVarName(*p) )
{ write_options o2 = *options;
clear(&o2, PL_WRT_QUOTED);
return writeAtom(*p, &o2) ? TRUE : -1;
}
return FALSE;
}
#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 = atom->name;
size_t len = atom->length;
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) )
{ size_t left = len;
if ( len >= 2 && s[0] == '/' && s[1] == '*' )
return AT_QUOTE;
for(; left > 0 && isSymbol(*s) && Scanrepresent(*s, fd)==0; s++, left--)
{ if ( *s == '`' )
{ GET_LD
if ( truePrologFlag(PLFLAG_BACKQUOTED_STRING) )
return AT_QUOTE;
}
}
if ( left > 0 )
return AT_QUOTE;
return AT_SYMBOL;
}
/* % 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
PutBar(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.
The C_* flags denote special cases handled using a flag. The first flag
is 0x200000, which is above the Unicode range.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#define C_PREFIX_SIGN 0x00200000 /* +/- as prefix op */
#define C_PREFIX_OP 0x00400000 /* any prefix op */
#define C_MASK 0xffe00000
#define isquote(c) ((c) == '\'' || (c) == '"')
static bool
needSpace(int c, IOSTREAM *s)
{ if ( c == EOF )
{ s->lastc = EOF;
return FALSE;
}
if ( s->lastc == EOF )
return FALSE;
if ( (s->lastc&C_PREFIX_SIGN) && (isDigit(c) || isSymbolW(c)) )
return TRUE;
if ( (s->lastc&C_PREFIX_OP) && c == '(' )
return TRUE; /* avoid op(...) */
s->lastc &= ~C_MASK;
if ( ((isAlphaW(s->lastc) && isAlphaW(c)) ||
(isSymbolW(s->lastc) && isSymbolW(c)) ||
(s->lastc != '(' && !isBlank(s->lastc) && c == '(') ||
(c == '\'' && (isDigit(s->lastc))) ||
(isquote(c) && s->lastc == c)
) )
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;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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 == ' ' ||
(!(c < 0xff && !isGraph(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;
if ( !(fid = PL_open_foreign_frame()) )
return FALSE;
Sputcode('{', options->out);
a = PL_new_term_ref();
PL_get_attr__LD(av, a PASS_LD);
if ( !writeTerm(a, 1200, options) )
return FALSE;
Sputcode('}', options->out);
PL_close_foreign_frame(fid);
return TRUE;
} else if ( (options->flags & PL_WRT_ATTVAR_PORTRAY) &&
GD->cleaning <= CLN_PROLOG )
{ predicate_t pred;
IOSTREAM *old;
wakeup_state wstate;
int rc;
pred = _PL_predicate("portray_attvar", 1, "$attvar",
&GD->procedures.portray_attvar1);
if ( !saveWakeup(&wstate, TRUE PASS_LD) )
return FALSE;
old = Scurout;
Scurout = options->out;
rc = PL_call_predicate(NULL, PL_Q_NODEBUG|PL_Q_PASS_EXCEPTION, pred, av);
if ( rc != TRUE && !PL_exception(0) )
rc = TRUE;
Scurout = old;
restoreWakeup(&wstate PASS_LD);
return rc;
}
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 *)atom->name;
for (e = s + atom->length; 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(atom->type, PL_BLOB_TEXT) &&
GD->cleaning <= CLN_PROLOG )
{ GET_LD
int rc;
fid_t fid;
term_t av;
if ( !(fid = PL_open_foreign_frame()) )
return FALSE;
av = PL_new_term_ref();
PL_put_atom(av, a);
rc = callPortray(av, 1200, options);
PL_close_foreign_frame(fid);
if ( rc == TRUE )
return TRUE;
}
if ( atom->type->write )
return (*atom->type->write)(options->out, a, options->flags);
if ( false(atom->type, 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:
return PutToken(atom->name, options->out);
case AT_QUOTE:
case AT_FULLSTOP:
default:
{ int rc;
TRY(rc=PutOpenToken('\'', options->out));
TRY(writeQuoted(options->out,
atom->name,
atom->length,
'\'', options));
return rc;
}
}
} else
return PutTokenN(atom->name, atom->length, 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*)a->name;
size_t len = a->length/sizeof(pl_wchar_t);
pl_wchar_t *e = &s[len];
if ( (flags&PL_WRT_QUOTED) && !unquoted_atomW(s, len, fd) )
{ pl_wchar_t quote = L'\'';
TRY(PutOpenToken(quote, fd) &&
Putc(quote, fd));
while(s < e)
{ TRY(putQuoted(*s++, quote, flags, fd));
}
return Putc(quote, fd);
}
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 */
assert(0);
fail;
}
static int
pl_nl__LD(term_t stream ARG_LD)
{ IOSTREAM *s;
if ( getTextOutputStream(stream, &s) )
{ Sputcode('\n', s);
return streamStatus(s);
}
return FALSE;
}
static
PRED_IMPL("nl", 1, nl, PL_FA_ISO)
{ PRED_LD
return pl_nl__LD(A1 PASS_LD);
}
static
PRED_IMPL("nl", 0, nl, PL_FA_ISO)
{ PRED_LD
return pl_nl__LD(0 PASS_LD);
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Call user:portray/1 if defined.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static int
put_write_options(term_t opts_in, write_options *options)
{ GET_LD
term_t newlist = PL_new_term_ref();
term_t precopt = PL_new_term_ref();
fid_t fid = PL_open_foreign_frame();
term_t head = PL_new_term_ref();
term_t tail = PL_copy_term_ref(opts_in);
term_t newhead = PL_new_term_ref();
term_t newtail = PL_copy_term_ref(newlist);
int rc = TRUE;
while(rc && PL_get_list(tail, head, tail))
{ if ( !PL_is_functor(head, FUNCTOR_priority1) )
rc = ( PL_unify_list(newtail, newhead, newtail) &&
PL_unify(newhead, head) );
}
if ( rc )
{ rc = ( PL_unify_list(newtail, head, newtail) &&
PL_unify_functor(head, FUNCTOR_priority1) &&
PL_get_arg(1, head, precopt) &&
PL_unify_nil(newtail) );
}
if ( rc )
{ options->write_options = newlist;
options->prec_opt = precopt;
}
PL_close_foreign_frame(fid);
return rc;
}
static int
callPortray(term_t arg, int prec, write_options *options)
{ predicate_t pred;
if ( GD->cleaning > CLN_PROLOG )
fail; /* avoid dangerous callbacks */
if ( options->portray_goal )
{ pred = _PL_predicate("call", 3, "user", &GD->procedures.call3);
} else
{ pred = _PL_predicate("portray", 1, "user", &GD->procedures.portray);
if ( !pred->definition->impl.any )
return FALSE;
}
{ GET_LD
wakeup_state wstate;
IOSTREAM *old = Scurout;
int rval;
term_t av;
if ( !saveWakeup(&wstate, TRUE PASS_LD) )
return FALSE;
Scurout = options->out;
if ( options->portray_goal )
{ av = PL_new_term_refs(3);
PL_put_term(av+0, options->portray_goal);
PL_put_term(av+1, arg);
PL_unify_integer(options->prec_opt, prec);
PL_put_term(av+2, options->write_options);
} else
{ av = arg;
}
rval = PL_call_predicate(NULL, PL_Q_NODEBUG|PL_Q_PASS_EXCEPTION,
pred, av);
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)
{ GET_LD
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 )
{ PutOpenToken('.', options->out);
rval = PutString("...", options->out);
} 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
writeList(term_t list, write_options *options)
{ 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;
}
TRY(PutComma(options));
}
return Putc(']', options->out);
}
static int
isBlockOp(term_t t, term_t arg, atom_t functor ARG_LD)
{ if ( functor == ATOM_nil || functor == ATOM_curl )
{ _PL_get_arg(1, t, arg);
if ( (functor == ATOM_nil && PL_is_pair(arg)) ||
(functor == ATOM_curl && PL_is_functor(arg, FUNCTOR_curl1)) )
return TRUE;
}
return FALSE;
}
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, prec, options) )
{ case TRUE:
return TRUE;
case FALSE:
break;
default:
return FALSE;
}
}
if ( PL_get_atom(t, &a) )
{ if ( !arg && prec < 1200 && priorityOperator(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 ( true(options, PL_WRT_NUMBERVARS|PL_WRT_VARNAMES) )
{ switch( writeNumberVar(t, options PASS_LD) )
{ case -1:
return FALSE;
case TRUE:
return TRUE;
}
}
if ( false(options, PL_WRT_IGNOREOPS) )
{ term_t arg;
if ( !(arg=PL_new_term_ref()) )
return FALSE;
if ( arity == 1 && functor == ATOM_curl ) /* {a,b,c} */
{ _PL_get_arg(1, t, arg);
TRY(Putc('{', out));
TRY(writeTerm(arg, 1200, options) &&
Putc('}', out));
succeed;
}
if ( arity == 2 && functor == ATOM_dot ) /* list */
return writeList(t, options);
if ( arity == 1 ||
(arity == 2 && isBlockOp(t, arg, functor PASS_LD)) )
{
/* 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 );
if ( embrace )
TRY(PutOpenBrace(out));
if ( arity == 1 )
{ TRY(writeAtom(functor, options));
} else
{ _PL_get_arg(1, t, arg);
TRY(writeTerm(arg, 1200, options));
}
/* +/-(Number) : avoid parsing as number */
options->out->lastc |= C_PREFIX_OP;
if ( functor == ATOM_minus || functor == ATOM_plus )
options->out->lastc |= C_PREFIX_SIGN;
_PL_get_arg(arity, t, arg);
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();
if ( op_pri > prec )
TRY(PutOpenBrace(out));
_PL_get_arg(arity, t, arg);
TRY(writeTerm(arg,
op_type == OP_XF ? op_pri-1 : op_pri,
options));
if ( arity == 1 )
{ TRY(writeAtom(functor, options));
} else
{ _PL_get_arg(1, t, arg);
TRY(writeTerm(arg, 1200, options));
}
if (op_pri > prec)
TRY(PutCloseBrace(out));
succeed;
}
} else if ( arity == 2 ||
(arity == 3 && isBlockOp(t, arg, functor PASS_LD)) )
{ /* <term> op <term> */
if ( currentOperator(options->module, functor, OP_INFIX,
&op_type, &op_pri) )
{ if ( op_pri > prec )
TRY(PutOpenBrace(out));
_PL_get_arg(arity-1, t, arg);
TRY(writeTerm(arg,
op_type == OP_XFX || op_type == OP_XFY
? op_pri-1 : op_pri,
options));
if ( functor == ATOM_comma )
{ TRY(PutComma(options));
} else if ( functor == ATOM_bar )
{ TRY(PutBar(options));
} else if ( arity == 2 )
{ switch(writeAtom(functor, options))
{ case FALSE:
fail;
case TRUE_WITH_SPACE:
TRY(Putc(' ', out));
}
} else /* block operator */
{ _PL_get_arg(1, t, arg);
TRY(writeTerm(arg, 1200, options));
}
_PL_get_arg(arity, t, arg);
TRY(writeTerm(arg,
op_type == OP_XFX || op_type == OP_YFX
? op_pri-1 : op_pri,
options));
if ( op_pri > prec )
TRY(PutCloseBrace(out));
succeed;
}
}
}
if ( (options->flags&PL_WRT_LIST) && arity == 2 && functor == ATOM_dot )
return writeList(t, options);
/* 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);
}
}
}
/*******************************
* CYCLE HANDLING *
*******************************/
static int
reunify_acyclic_substitutions(term_t substitutions, term_t cycles,
write_options *options)
{ GET_LD
term_t s_tail, c_tail, s_head, c_head, var, value;
intptr_t count = 0;
if ( !(s_tail = PL_copy_term_ref(substitutions)) ||
!(c_tail = PL_copy_term_ref(cycles)) ||
!(s_head = PL_new_term_ref()) ||
!(c_head = PL_new_term_ref()) ||
!(var = PL_new_term_ref()) ||
!(value = PL_new_term_ref()) )
return FALSE;
while(PL_get_list(s_tail, s_head, s_tail))
{ _PL_get_arg(1, s_head, var);
_PL_get_arg(2, s_head, value);
if ( PL_var_occurs_in(var, value) )
{ if ( (options->flags&PL_WRT_NUMBERVARS) )
{ if ( !PL_unify_term(var,
PL_FUNCTOR, FUNCTOR_isovar1,
PL_INTPTR, --count) )
return FALSE;
}
if ( !PL_unify_list(c_tail, c_head, c_tail) ||
!PL_unify(c_head, s_head) )
return FALSE;
} else
{ if ( !PL_unify(var, value) )
return FALSE;
}
}
return PL_unify_nil(c_tail);
}
static int
writeTopTerm(term_t term, int prec, write_options *options)
{ GET_LD
int rc;
Slock(options->out);
if ( (!(options->flags&PL_WRT_NO_CYCLES) && options->max_depth) ||
PL_is_acyclic(term) )
{ rc = writeTerm(term, prec, options);
} else
{ fid_t fid;
term_t template, substitutions, cycles, at_term;
if ( options->flags & PL_WRT_NO_CYCLES )
return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_cyclic_term, term);
if ( !(fid = PL_open_foreign_frame()) ||
!(template = PL_new_term_ref()) ||
!(substitutions = PL_new_term_ref()) ||
!(cycles = PL_new_term_ref()) ||
!(at_term = PL_new_term_ref()) ||
!PL_factorize_term(term, template, substitutions) ||
!reunify_acyclic_substitutions(substitutions, cycles, options) ||
!PL_unify_term(at_term,
PL_FUNCTOR, FUNCTOR_xpceref2,
PL_TERM, template,
PL_TERM, cycles) )
return FALSE;
rc = writeTerm(at_term, prec, options);
PL_discard_foreign_frame(fid);
}
Sunlock(options->out);
return rc;
}
static int
bind_varnames(term_t names ARG_LD)
{ term_t tail, head, var, namet;
int check_cycle_after = 1000;
if ( !(tail = PL_copy_term_ref(names)) ||
!(head = PL_new_term_ref()) ||
!(var = PL_new_term_ref()) ||
!(namet = PL_new_term_ref()) )
return FALSE;
while(PL_get_list_ex(tail, head, tail))
{ if ( PL_is_functor(head, FUNCTOR_equals2) )
{ atom_t name;
_PL_get_arg(2, head, var);
_PL_get_arg(1, head, namet);
if ( !PL_get_atom_ex(namet, &name) )
return FALSE;
if ( !atomIsVarName(name) )
return PL_domain_error("variable_name", namet);
if ( PL_is_variable(var) )
{ if ( !PL_unify_term(var,
PL_FUNCTOR, FUNCTOR_isovar1,
PL_ATOM, name) )
return FALSE;
}
} else
return PL_type_error("variable_assignment", head);
if ( --check_cycle_after == 0 &&
lengthList(tail, FALSE) == -1 )
return PL_type_error("list", head);
}
return PL_get_nil_ex(tail);
}
/*******************************
* TOPLEVEL *
*******************************/
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_portray_goal, OPT_TERM },
{ 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 },
{ ATOM_cycles, OPT_BOOL },
{ ATOM_variable_names, OPT_TERM },
{ 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;
term_t gportray = 0;
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;
bool cycles = TRUE;
term_t varnames = 0;
int local_varnames;
IOSTREAM *s = NULL;
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,
"ed, &ignore_ops, &numbervars, &portray, &gportray,
&charescape, &options.max_depth, &mname,
&bqstring, &attr, &priority, &partial, &options.spacing,
&blobs, &cycles, &varnames) )
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);
}
}
options.module = lookupModule(mname);
if ( charescape == TRUE ||
(charescape == -1 && true(options.module, M_CHARESCAPE)) )
options.flags |= PL_WRT_CHARESCAPES;
if ( gportray )
{ options.portray_goal = gportray;
if ( !put_write_options(opts, &options) ||
!PL_qualify(options.portray_goal, options.portray_goal) )
return FALSE;
portray = TRUE;
}
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;
if ( !cycles ) options.flags |= PL_WRT_NO_CYCLES;
local_varnames = (varnames && false(&options, PL_WRT_NUMBERVARS));
BEGIN_NUMBERVARS(local_varnames);
if ( varnames )
{ if ( (rc=bind_varnames(varnames PASS_LD)) )
options.flags |= PL_WRT_VARNAMES;
else
goto out;
}
if ( !(rc=getTextOutputStream(stream, &s)) )
goto out;
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 = writeTopTerm(term, priority, &options);
s->flags &= ~SIO_REPPL;
} else
{ rc = writeTopTerm(term, priority, &options);
}
out:
END_NUMBERVARS(local_varnames);
return (!s || 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 writeTopTerm(term, precedence, &options);
}
static word
do_write2(term_t stream, term_t term, int flags)
{ GET_LD
IOSTREAM *s;
if ( getTextOutputStream(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, M_CHARESCAPE) )
options.flags |= PL_WRT_CHARESCAPES;
if ( truePrologFlag(PLFLAG_BACKQUOTED_STRING) )
options.flags |= PL_WRT_BACKQUOTED_STRING;
PutOpenToken(EOF, s); /* reset this */
rc = writeTopTerm(term, 1200, &options);
if ( rc && (flags&PL_WRT_NEWLINE) )
rc = Putc('\n', s);
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
nv_options options;
word rc;
BEGIN_NUMBERVARS(TRUE);
options.functor = FUNCTOR_isovar1;
options.on_attvar = AV_SKIP;
options.singletons = PL_is_acyclic(term);
options.numbered_check = FALSE;
rc = ( numberVars(term, &options, 0 PASS_LD) >= 0 &&
do_write2(stream, term,
PL_WRT_QUOTED|PL_WRT_IGNOREOPS|PL_WRT_NUMBERVARS)
);
END_NUMBERVARS(TRUE);
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
pl_writeln(term_t term)
{ return do_write2(0, term, PL_WRT_NUMBERVARS|PL_WRT_NEWLINE);
}
static
PRED_IMPL("$put_token", 2, put_token, 0)
{ char *s;
size_t len;
IOSTREAM *out;
if ( !PL_get_stream_handle(A1, &out) )
fail;
if ( !PL_get_nchars(A2, &len, &s, CVT_ATOM|CVT_STRING|CVT_EXCEPTION) )
fail;
if ( PutTokenN(s, len, out) )
return PL_release_stream(out);
PL_release_stream(out);
fail;
}
/** '$put_quoted_codes'(+Stream, +Quote, +Codes, +Options)
Emit Codes using the escaped character syntax, but does not emit the
start and end-code itself. Options is currently ignored. It is intended
to provide additional preferences, so as using \uXXXX, \UXXXXXXXX, etc.
*/
static
PRED_IMPL("$put_quoted", 4, put_quoted_codes, 0)
{ IOSTREAM *out;
pl_wchar_t *w;
size_t i, len;
int quote;
int flags = PL_WRT_CHARESCAPES;
int rc = TRUE;
if ( !PL_get_stream_handle(A1, &out) ||
!PL_get_char_ex(A2, "e, FALSE) ||
!PL_get_wchars(A3, &len, &w, CVT_LIST|CVT_STRING|CVT_EXCEPTION) )
return FALSE;
for(i=0; rc && i<len; i++)
rc = putQuoted(w[i], quote, flags, out);
if ( rc )
rc = PL_release_stream(out);
return rc;
}
/*******************************
* PRINT LENGTH *
*******************************/
typedef struct limit_size_stream
{ IOSTREAM *stream; /* Limited stream */
int64_t length; /* Max size */
} limit_size_stream;
static ssize_t
Swrite_lss(void *handle, char *buf, size_t size)
{ limit_size_stream *lss = handle;
(void)buf;
if ( lss->stream->position->charno > lss->length )
return -1;
return size;
}
static int
Sclose_lss(void *handle)
{ (void)handle;
return 0;
}
static const IOFUNCTIONS lss_functions =
{ NULL,
Swrite_lss,
NULL,
Sclose_lss
};
/** write_length(+Term, -Len, +Options) is det.
(*) Avoid error on max_length in iso mode. It might be nicer to get the
option processing out of pl_write_term3(), so we can take control of the
whole lot here more easily.
*/
static
PRED_IMPL("write_length", 3, write_length, 0)
{ PRED_LD
limit_size_stream lss;
int sflags = SIO_NBUF|SIO_RECORDPOS|SIO_OUTPUT|SIO_TEXT;
IOSTREAM *s;
term_t options = PL_copy_term_ref(A3);
term_t head = PL_new_term_ref();
char buf[100];
lss.length = PLMAXINT;
while(PL_get_list(options, head, options))
{ atom_t name;
int arity;
if ( PL_get_name_arity(head, &name, &arity) &&
name == ATOM_max_length && arity == 1 )
{ term_t a = PL_new_term_ref();
_PL_get_arg(1, head, a);
if ( !PL_get_int64_ex(a, &lss.length) )
return FALSE;
}
}
if ( (s = Snew(&lss, sflags, (IOFUNCTIONS *)&lss_functions)) )
{ int64_t len;
int rc;
pl_features_t oldmask = LD->prolog_flag.mask; /* (*) */
lss.stream = s;
s->encoding = ENC_UTF8;
Ssetbuffer(s, buf, sizeof(buf));
s->flags |= SIO_USERBUF;
clearPrologFlagMask(PLFLAG_ISO);
pushOutputContext();
Scurout = s;
rc = pl_write_term3(0, A1, A3);
popOutputContext();
LD->prolog_flag.mask = oldmask;
if ( rc && s->position->charno <= lss.length )
{ len = s->position->charno;
} else
{ len = -1;
if ( s->position->charno > lss.length )
PL_clear_exception();
}
Sclose(s);
if ( len >= 0 )
return PL_unify_int64(A2, len);
}
return FALSE;
}
/*******************************
* PUBLISH PREDICATES *
*******************************/
BeginPredDefs(write)
PRED_DEF("nl", 0, nl, PL_FA_ISO)
PRED_DEF("nl", 1, nl, PL_FA_ISO)
PRED_DEF("$put_token", 2, put_token, 0)
PRED_DEF("$put_quoted", 4, put_quoted_codes, 0)
PRED_DEF("write_length", 3, write_length, 0)
EndPredDefs
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