545 lines
13 KiB
C
545 lines
13 KiB
C
/* $Id$
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Part of SWI-Prolog
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Author: Jan Wielemaker
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E-mail: J.Wielemaker@cs.vu.nl
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WWW: http://www.swi-prolog.org
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Copyright (C): 1985-2010, University of Amsterdam
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Vu University Amsterdam
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <math.h>
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#include "pl-incl.h"
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#include "pl-dtoa.h"
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#include "pl-ctype.h"
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#include <stdio.h> /* sprintf() */
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#ifdef HAVE_LOCALE_H
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#include <locale.h>
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#endif
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#ifdef HAVE_FLOAT_H
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#include <float.h>
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#endif
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#ifdef HAVE_IEEEFP_H
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#include <ieeefp.h>
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#endif
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#ifdef fpclassify
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#define HAVE_FPCLASSIFY 1
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#endif
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#if __YAP_PROLOG__
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#define _PL_WRITE_ 1
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#include "yapio.h"
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#endif
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typedef struct visited
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{ Word address; /* we have done this address */
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struct visited *next; /* next already visited */
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} visited;
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typedef struct
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{ int flags; /* PL_WRT_* flags */
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int max_depth; /* depth limit */
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int depth; /* current depth */
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atom_t spacing; /* Where to insert spaces */
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Term module; /* Module for operators */
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IOSTREAM *out; /* stream to write to */
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visited *visited; /* visited (attributed-) variables */
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} write_options;
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word
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pl_nl1(term_t stream)
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{ IOSTREAM *s;
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if ( getOutputStream(stream, &s) )
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{ Sputcode('\n', s);
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return streamStatus(s);
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}
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fail;
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}
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word
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pl_nl(void)
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{ return pl_nl1(0);
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}
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Formatting a float. This used to use sprintf(), but there are two
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problems with this. First of all, this uses the current locale, which is
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complicated to avoid. Second, it does not provide a mode that guarantees
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reliable read-back. Using %g gets closest, but %.15g doesn't guarantee
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read-back and %.17g does, but prints 0.1 as 0.100..001, etc.
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This uses dtoa.c. See pl-dtoa.c for how this is packed into SWI-Prolog.
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TBD: The number of cases are large. We should see whether it is possible
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to clean this up a bit. The 5 cases as such are real: there is no way
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around these.
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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char *
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format_float(double f, char *buf)
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{ char *end, *o=buf;
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int decpt, sign;
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char *s = dtoa(f, 0, 30, &decpt, &sign, &end);
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DEBUG(2, Sdprintf("decpt=%d, sign=%d, len = %d, '%s'\n",
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decpt, sign, end-s, s));
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if ( sign )
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*o++ = '-';
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if ( decpt <= 0 ) /* decimal dot before */
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{ if ( decpt <= -4 )
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{ *o++ = s[0];
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*o++ = '.';
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if ( end-s > 1 )
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{ memcpy(o, s+1, end-s-1);
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o += end-s-1;
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} else
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*o++ = '0';
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sprintf(o, "e%d", decpt-1);
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} else
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{ int i;
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*o++ = '0';
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*o++ = '.';
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for(i=0; i < -decpt; i++)
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*o++ = '0';
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memcpy(o, s, end-s);
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o[end-s] = 0;
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}
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} else if ( end-s > decpt ) /* decimal dot inside */
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{ memcpy(o, s, decpt);
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o += decpt;
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*o++ = '.';
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memcpy(o, s+decpt, end-s-decpt);
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o[end-s-decpt] = 0;
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} else /* decimal dot after */
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{ int i;
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int trailing = decpt-(int)(end-s);
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if ( decpt > 15 ) /* over precision: use eE */
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{ *o++ = s[0];
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*o++ = '.';
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if ( end-s > 1 )
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{ trailing += (int)(end-s)-1;
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memcpy(o, s+1, end-s-1);
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o += end-s-1;
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} else
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*o++ = '0';
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sprintf(o, "e+%d", trailing);
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} else /* within precision trail with .0 */
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{ memcpy(o, s, end-s);
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o += end-s;
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for(i=(int)(end-s); i<decpt; i++)
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*o++ = '0';
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*o++ = '.';
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*o++ = '0';
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*o = 0;
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}
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}
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freedtoa(s);
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return buf;
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}
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char *
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varName(term_t t, char *name)
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{
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CACHE_REGS
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CELL *adr = (CELL *)Yap_GetFromSlot(t PASS_REGS);
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if (IsAttVar(adr)) {
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Ssprintf(name, "_D%ld", (CELL)adr - (CELL)H0);
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} else {
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Ssprintf(name, "_%ld", (CELL)adr - (CELL)H0);
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}
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return name;
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}
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static bool
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writeTerm(term_t t, int prec, write_options *options)
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{
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CACHE_REGS
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UInt yap_flag = Use_SWI_Stream_f;
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int flags = options->flags;
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Term old_module;
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if (flags & PL_WRT_QUOTED)
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yap_flag |= Quote_illegal_f;
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if (options->flags & PL_WRT_NUMBERVARS)
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yap_flag |= Handle_vars_f;
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if (options->flags & PL_WRT_IGNOREOPS)
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yap_flag |= Ignore_ops_f;
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if (flags & PL_WRT_PORTRAY)
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yap_flag |= Use_portray_f;
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if (flags & PL_WRT_BACKQUOTED_STRING)
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yap_flag |= BackQuote_String_f;
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if (flags & PL_WRT_ATTVAR_IGNORE)
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yap_flag |= 0L;
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if (flags & PL_WRT_ATTVAR_DOTS)
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yap_flag |= AttVar_Dots_f;
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if (flags & PL_WRT_ATTVAR_PORTRAY)
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yap_flag |= AttVar_Portray_f;
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if (flags & PL_WRT_BLOB_PORTRAY)
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yap_flag |= Blob_Portray_f;
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old_module = CurrentModule;
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CurrentModule = options->module;
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Yap_plwrite(Yap_GetFromSlot(t PASS_REGS), options->out, options->max_depth, yap_flag, prec);
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CurrentModule = old_module;
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return TRUE;
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}
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int
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writeAtomToStream(IOSTREAM *s, atom_t atom)
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{ Yap_plwrite(MkAtomTerm(YAP_AtomFromSWIAtom(atom)), s, 0, 0, 1200);
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return 1;
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}
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int
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writeAttributeMask(atom_t a)
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{ if ( a == ATOM_ignore )
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{ return PL_WRT_ATTVAR_IGNORE;
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} else if ( a == ATOM_dots )
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{ return PL_WRT_ATTVAR_DOTS;
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} else if ( a == ATOM_write )
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{ return PL_WRT_ATTVAR_WRITE;
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} else if ( a == ATOM_portray )
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{ return PL_WRT_ATTVAR_PORTRAY;
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} else
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return 0;
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}
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static int
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writeBlobMask(atom_t a)
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{ if ( a == ATOM_default )
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{ return 0;
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} else if ( a == ATOM_portray )
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{ return PL_WRT_BLOB_PORTRAY;
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} else
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return -1;
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}
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static const opt_spec write_term_options[] =
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{ { ATOM_quoted, OPT_BOOL },
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{ ATOM_ignore_ops, OPT_BOOL },
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{ ATOM_numbervars, OPT_BOOL },
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{ ATOM_portray, OPT_BOOL },
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{ ATOM_character_escapes, OPT_BOOL },
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{ ATOM_max_depth, OPT_INT },
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{ ATOM_module, OPT_ATOM },
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{ ATOM_backquoted_string, OPT_BOOL },
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{ ATOM_attributes, OPT_ATOM },
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{ ATOM_priority, OPT_INT },
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{ ATOM_partial, OPT_BOOL },
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{ ATOM_spacing, OPT_ATOM },
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{ ATOM_blobs, OPT_ATOM },
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{ NULL_ATOM, 0 }
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};
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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PutOpenToken() inserts a space in the output stream if the last-written
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and given character require a space to ensure a token-break.
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#define TRUE_WITH_SPACE 2 /* OK, and emitted leading space before token */
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static bool
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Putc(int c, IOSTREAM *s)
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{ return Sputcode(c, s) == EOF ? FALSE : TRUE;
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}
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#define LAST_C_RESERVED 0x110000 /* Above Unicode range */
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#define PREFIX_SIGN (LAST_C_RESERVED+1)
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#define isquote(c) ((c) == '\'' || (c) == '"')
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static bool
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needSpace(int c, IOSTREAM *s)
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{ if ( c == EOF )
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{ s->lastc = EOF;
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return FALSE;
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}
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if ( s->lastc == PREFIX_SIGN ) /* avoid passing to is*W() functions */
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{ if ( isDigit(c) || isSymbolW(c) )
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return TRUE;
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return FALSE;
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}
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if ( s->lastc != EOF &&
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((isAlphaW(s->lastc) && isAlphaW(c)) ||
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(isSymbolW(s->lastc) && isSymbolW(c)) ||
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(s->lastc != '(' && !isBlank(s->lastc) && c == '(') ||
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(c == '\'' && (isDigit(s->lastc))) ||
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(isquote(c) && s->lastc == c)
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) )
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return TRUE;
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return FALSE;
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}
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static int
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PutOpenToken(int c, IOSTREAM *s)
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{ if ( needSpace(c, s) )
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{ TRY(Putc(' ', s));
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return TRUE_WITH_SPACE;
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}
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return TRUE;
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}
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word
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pl_write_term3(term_t stream, term_t term, term_t opts)
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{ GET_LD
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bool quoted = FALSE;
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bool ignore_ops = FALSE;
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bool numbervars = -1; /* not set */
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bool portray = FALSE;
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bool bqstring = truePrologFlag(PLFLAG_BACKQUOTED_STRING);
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bool charescape = -1; /* not set */
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atom_t mname = ATOM_user;
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atom_t attr = ATOM_nil;
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atom_t blobs = ATOM_nil;
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int priority = 1200;
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bool partial = FALSE;
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IOSTREAM *s;
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write_options options;
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int rc;
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memset(&options, 0, sizeof(options));
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options.spacing = ATOM_standard;
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if ( !scan_options(opts, 0, ATOM_write_option, write_term_options,
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"ed, &ignore_ops, &numbervars, &portray,
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&charescape, &options.max_depth, &mname,
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&bqstring, &attr, &priority, &partial, &options.spacing,
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&blobs) )
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fail;
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if ( attr == ATOM_nil )
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{ options.flags |= LD->prolog_flag.write_attributes;
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} else
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{ int mask = writeAttributeMask(attr);
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if ( !mask )
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return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_write_option, opts);
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options.flags |= mask;
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}
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if ( blobs != ATOM_nil )
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{ int mask = writeBlobMask(blobs);
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if ( mask < 0 )
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return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_write_option, opts);
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options.flags |= mask;
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}
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if ( priority < 0 || priority > OP_MAXPRIORITY )
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{ term_t t = PL_new_term_ref();
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PL_put_integer(t, priority);
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return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_operator_priority, t);
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}
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switch( options.spacing )
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{ case ATOM_standard:
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case ATOM_next_argument:
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break;
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default:
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{ term_t t = PL_new_term_ref();
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PL_put_atom(t, options.spacing);
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return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_spacing, t);
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}
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}
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if ( !getOutputStream(stream, &s) )
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fail;
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options.module = lookupModule(mname);
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if ( charescape == TRUE ||
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// (charescape == -1 && true(options.module, CHARESCAPE)) )
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charEscapeWriteOption(options))
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options.flags |= PL_WRT_CHARESCAPES;
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if ( numbervars == -1 )
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numbervars = (portray ? TRUE : FALSE);
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if ( quoted ) options.flags |= PL_WRT_QUOTED;
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if ( ignore_ops ) options.flags |= PL_WRT_IGNOREOPS;
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if ( numbervars ) options.flags |= PL_WRT_NUMBERVARS;
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if ( portray ) options.flags |= PL_WRT_PORTRAY;
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if ( bqstring ) options.flags |= PL_WRT_BACKQUOTED_STRING;
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options.out = s;
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if ( !partial )
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PutOpenToken(EOF, s); /* reset this */
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if ( (options.flags & PL_WRT_QUOTED) && !(s->flags&SIO_REPPL) )
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{ s->flags |= SIO_REPPL;
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rc = writeTerm(term, priority, &options);
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s->flags &= ~SIO_REPPL;
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} else
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{ rc = writeTerm(term, priority, &options);
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}
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return streamStatus(s) && rc;
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}
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word
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pl_write_term(term_t term, term_t options)
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{ return pl_write_term3(0, term, options);
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}
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int
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PL_write_term(IOSTREAM *s, term_t term, int precedence, int flags)
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{ write_options options;
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memset(&options, 0, sizeof(options));
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options.flags = flags;
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options.out = s;
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options.module = USER_MODULE; //MODULE_user;
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PutOpenToken(EOF, s); /* reset this */
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return writeTerm(term, precedence, &options);
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}
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static word
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do_write2(term_t stream, term_t term, int flags)
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{ GET_LD
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IOSTREAM *s;
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if ( getOutputStream(stream, &s) )
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{ write_options options;
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int rc;
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memset(&options, 0, sizeof(options));
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options.flags = flags;
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options.out = s;
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options.module = USER_MODULE; // MODULE_user;
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// if ( options.module && true(options.module, CHARESCAPE) )
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if (charEscapeWriteOption(options))
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options.flags |= PL_WRT_CHARESCAPES;
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if ( truePrologFlag(PLFLAG_BACKQUOTED_STRING) )
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options.flags |= PL_WRT_BACKQUOTED_STRING;
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PutOpenToken(EOF, s); /* reset this */
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rc = writeTerm(term, 1200, &options);
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return streamStatus(s) && rc;
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}
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return FALSE;
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}
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word
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pl_write2(term_t stream, term_t term)
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{ return do_write2(stream, term, PL_WRT_NUMBERVARS);
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}
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word
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pl_writeq2(term_t stream, term_t term)
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{ return do_write2(stream, term, PL_WRT_QUOTED|PL_WRT_NUMBERVARS);
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}
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word
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pl_print2(term_t stream, term_t term)
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{ return do_write2(stream, term,
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PL_WRT_PORTRAY|PL_WRT_NUMBERVARS);
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}
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word
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pl_write_canonical2(term_t stream, term_t term)
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{ GET_LD
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fid_t fid;
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nv_options options;
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word rc;
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if ( !(fid = PL_open_foreign_frame()) )
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return FALSE;
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options.functor = FUNCTOR_isovar1;
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options.on_attvar = AV_SKIP;
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options.singletons = TRUE;
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#if __YAP_PROLOG__
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LOCAL_FunctorVar = FunctorHiddenVar;
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#endif
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numberVars(term, &options, 0 PASS_LD);
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rc = do_write2(stream, term,
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PL_WRT_QUOTED|PL_WRT_IGNOREOPS|PL_WRT_NUMBERVARS);
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#if __YAP_PROLOG__
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LOCAL_FunctorVar = FunctorVar;
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#endif
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PL_discard_foreign_frame(fid);
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return rc;
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}
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word
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pl_write(term_t term)
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{ return pl_write2(0, term);
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}
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word
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pl_writeq(term_t term)
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{ return pl_writeq2(0, term);
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}
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word
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pl_print(term_t term)
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{ return pl_print2(0, term);
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}
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word
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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;
|
|
}
|
|
|
|
|
|
/*******************************
|
|
* PUBLISH PREDICATES *
|
|
*******************************/
|
|
|
|
BeginPredDefs(write)
|
|
EndPredDefs
|
|
|