1275 lines
33 KiB
C
1275 lines
33 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: write.c *
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* Last rev: *
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* mods: *
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* comments: Writing a Prolog Term *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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#endif
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#include <stdlib.h>
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#include <math.h>
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#include "Yap.h"
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#include "Yatom.h"
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#include "YapHeap.h"
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#include "YapText.h"
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#include "yapio.h"
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#include "clause.h"
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#if COROUTINING
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#include "attvar.h"
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#endif
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#include "iopreds.h"
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#if HAVE_STRING_H
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#include <string.h>
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#endif
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#if HAVE_CTYPE_H
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#include <ctype.h>
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#endif
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#if HAVE_LOCALE_H
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#include <locale.h>
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#endif
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/* describe the type of the previous term to have been written */
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typedef enum {
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start, /* initialization */
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separator, /* the previous term was a separator like ',', ')', ... */
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alphanum, /* the previous term was an atom or number */
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symbol /* the previous term was a symbol like +, -, *, .... */
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} wtype;
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typedef StreamDesc *wrf;
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typedef struct union_slots {
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Int old;
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Int ptr;
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} uslots;
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typedef struct union_direct {
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Term old;
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CELL *ptr;
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} udirect;
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typedef struct rewind_term {
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struct rewind_term *parent;
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union {
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struct union_slots s;
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struct union_direct d;
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} u_sd;
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} rwts;
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typedef struct write_globs {
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StreamDesc *stream;
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int Quote_illegal, Ignore_ops, Handle_vars, Use_portray, Portray_delays;
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int Keep_terms;
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int Write_Loops;
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int Write_strings;
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int last_atom_minus;
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UInt MaxDepth, MaxArgs;
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wtype lw;
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} wglbs;
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#define lastw wglb->lw
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#define last_minus wglb->last_atom_minus
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static bool callPortray(Term t, struct DB_TERM **old_EXp, int sno USES_REGS) {
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PredEntry *pe;
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Int b0 = LCL0 - (CELL *)B;
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EX = NULL;
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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if ((pe = RepPredProp(Yap_GetPredPropByFunc(FunctorPortray, USER_MODULE))) &&
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pe->OpcodeOfPred != FAIL_OPCODE && pe->OpcodeOfPred != UNDEF_OPCODE &&
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Yap_execute_pred(pe, &t, true PASS_REGS)) {
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choiceptr B0 = (choiceptr)(LCL0 - b0);
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if (EX && !*old_EXp)
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*old_EXp = EX;
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Yap_fail_all(B0 PASS_REGS);
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LOCK(GLOBAL_Stream[sno].streamlock);
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return true;
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}
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LOCK(GLOBAL_Stream[sno].streamlock);
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if (EX && !*old_EXp)
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*old_EXp = EX;
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return false;
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}
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static void wrputn(Int, struct write_globs *);
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static void wrputf(Float, struct write_globs *);
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static void wrputref(CODEADDR, int, struct write_globs *);
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static int legalAtom(unsigned char *);
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/*static int LeftOpToProtect(Atom, int);
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static int RightOpToProtect(Atom, int);*/
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static wtype AtomIsSymbols(unsigned char *);
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static void putAtom(Atom, int, struct write_globs *);
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static void writeTerm(Term, int, int, int, struct write_globs *,
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struct rewind_term *);
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#define wrputc(WF, X) (X)->stream_wputc(X-GLOBAL_Stream, WF) /* writes a character */
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/*
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protect bracket from merging with previoous character.
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avoid stuff like not (2,3) -> not(2,3) or
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*/
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static void wropen_bracket(struct write_globs *wglb, int protect) {
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StreamDesc *stream = wglb->stream;
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if (lastw != separator && protect)
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wrputc(' ', stream);
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wrputc('(', stream);
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lastw = separator;
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}
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static void wrclose_bracket(struct write_globs *wglb, int protect) {
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wrf stream = wglb->stream;
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wrputc(')', stream);
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lastw = separator;
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}
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static int protect_open_number(struct write_globs *wglb, int lm,
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int minus_required) {
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wrf stream = wglb->stream;
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if (lastw == symbol && lm && !minus_required) {
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wropen_bracket(wglb, TRUE);
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return TRUE;
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} else if (lastw == alphanum || (lastw == symbol && minus_required)) {
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wrputc(' ', stream);
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}
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return FALSE;
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}
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static void protect_close_number(struct write_globs *wglb, int used_bracket) {
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if (used_bracket) {
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wrclose_bracket(wglb, TRUE);
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} else {
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lastw = alphanum;
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}
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last_minus = FALSE;
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}
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static void wrputn(Int n,
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struct write_globs *wglb) /* writes an integer */
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{
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wrf stream = wglb->stream;
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char s[256], *s1 = s; /* that should be enough for most integers */
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int has_minus = (n < 0);
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int ob;
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ob = protect_open_number(wglb, last_minus, has_minus);
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#if HAVE_SNPRINTF
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snprintf(s, 256, Int_FORMAT, n);
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#else
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sprintf(s, Int_FORMAT, n);
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#endif
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while (*s1)
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wrputc(*s1++, stream);
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protect_close_number(wglb, ob);
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}
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inline static void
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wrputs(char *s, StreamDesc *stream) {
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int c;
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while ((c = *s++)) wrputc(c, stream);
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}
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static void wrputws(wchar_t *s, wrf stream) /* writes a string */
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{
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while (*s)
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wrputc(*s++, stream);
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}
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#ifdef USE_GMP
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static char *ensure_space(size_t sz) {
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CACHE_REGS
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char *s;
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s = (char *)Yap_PreAllocCodeSpace();
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while (s + sz >= (char *)AuxSp) {
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#if USE_SYSTEM_MALLOC
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/* may require stack expansion */
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if (!Yap_ExpandPreAllocCodeSpace(sz, NULL, TRUE)) {
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s = NULL;
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break;
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}
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s = (char *)Yap_PreAllocCodeSpace();
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#else
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s = NULL;
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#endif
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}
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if (!s) {
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s = (char *)TR;
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while (s + sz >= LOCAL_TrailTop) {
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if (!Yap_growtrail(sz / sizeof(CELL), FALSE)) {
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s = NULL;
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break;
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}
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s = (char *)TR;
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}
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}
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if (!s) {
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s = (char *)HR;
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if (s + sz >= (char *)ASP) {
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Yap_Error(OUT_OF_STACK_ERROR, TermNil,
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"not enough space to write bignum: it requires %d bytes", sz);
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s = NULL;
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}
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}
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return s;
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}
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static void write_mpint(MP_INT *big, struct write_globs *wglb) {
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char *s;
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int has_minus = mpz_sgn(big);
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int ob;
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s = ensure_space(3 + mpz_sizeinbase(big, 10));
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ob = protect_open_number(wglb, last_minus, has_minus);
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if (!s) {
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s = mpz_get_str(NULL, 10, big);
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if (!s)
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return;
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wrputs(s, wglb->stream);
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free(s);
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} else {
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mpz_get_str(s, 10, big);
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wrputs(s, wglb->stream);
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}
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protect_close_number(wglb, ob);
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}
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#endif
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/* writes a bignum */
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static void writebig(Term t, int p, int depth, int rinfixarg,
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struct write_globs *wglb, struct rewind_term *rwt) {
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CELL *pt = RepAppl(t) + 1;
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CELL big_tag = pt[0];
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if (big_tag == ARRAY_INT || big_tag == ARRAY_FLOAT) {
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wrputc('{', wglb->stream);
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wrputs("...", wglb->stream);
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wrputc('}', wglb->stream);
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lastw = separator;
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return;
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#ifdef USE_GMP
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} else if (big_tag == BIG_INT) {
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MP_INT *big = Yap_BigIntOfTerm(t);
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write_mpint(big, wglb);
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return;
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} else if (big_tag == BIG_RATIONAL) {
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Term trat = Yap_RatTermToApplTerm(t);
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writeTerm(trat, p, depth, rinfixarg, wglb, rwt);
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return;
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#endif
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} else if (big_tag >= USER_BLOB_START && big_tag < USER_BLOB_END) {
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Opaque_CallOnWrite f;
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CELL blob_info;
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blob_info = big_tag - USER_BLOB_START;
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if (GLOBAL_OpaqueHandlers &&
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(f = GLOBAL_OpaqueHandlers[blob_info].write_handler)) {
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(f)(wglb->stream->file, big_tag, ExternalBlobFromTerm(t), 0);
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return;
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}
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}
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wrputs("0", wglb->stream);
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}
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static void wrputf(Float f, struct write_globs *wglb) /* writes a float */
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{
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#if THREADS
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char s[256];
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#endif
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wrf stream = wglb->stream;
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int sgn;
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int ob;
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#if HAVE_ISNAN || defined(__WIN32)
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if (isnan(f)) {
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wrputs("(nan)", stream);
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lastw = separator;
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return;
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}
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#endif
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sgn = (f < 0.0);
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#if HAVE_ISINF || defined(_WIN32)
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if (isinf(f)) {
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if (sgn) {
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wrputs("(-inf)", stream);
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} else {
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wrputs("(+inf)", stream);
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}
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lastw = separator;
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return;
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}
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#endif
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ob = protect_open_number(wglb, last_minus, sgn);
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#if THREADS
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/* old style writing */
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int found_dot = FALSE;
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char *pt = s;
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int ch;
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/* always use C locale for writing numbers */
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#if O_LOCALE
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const unsigned char *decimalpoint =
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(unsigned char *)localeconv()->decimal_point;
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size_t l1 = strlen((const char *)decimalpoint + 1);
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#else
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const unsigned char decimalpoint[2] = ".";
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size_t l1 = 0;
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#endif
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if (lastw == symbol || lastw == alphanum) {
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wrputc(' ', stream);
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}
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lastw = alphanum;
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// sprintf(s, "%.15g", f);
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sprintf(s, RepAtom(AtomFloatFormat)->StrOfAE, f);
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while (*pt == ' ')
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pt++;
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if (*pt == '-') {
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wrputc('-', stream);
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pt++;
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}
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while ((ch = *pt) != '\0') {
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// skip locale
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if (ch == decimalpoint[0] &&
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!strncmp(pt + 1, (char *)decimalpoint + 1, l1)) {
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found_dot = TRUE;
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pt += l1;
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ch = '.';
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}
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if (ch == 'e' || ch == 'E') {
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if (!found_dot) {
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found_dot = TRUE;
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wrputs(".0", stream);
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}
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found_dot = TRUE;
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}
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wrputc(ch, stream);
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pt++;
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}
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if (!found_dot) {
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wrputs(".0", stream);
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}
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#else
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char buf[256];
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if (lastw == symbol || lastw == alphanum) {
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wrputc(' ', stream);
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}
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/* use SWI's format_float */
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sprintf(buf, (char *)floatFormat(),f);
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wrputs(buf, stream);
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#endif
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protect_close_number(wglb, ob);
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}
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int Yap_FormatFloat(Float f, char **s, size_t sz) {
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CACHE_REGS
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struct write_globs wglb;
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int sno;
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char *so;
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sno = Yap_open_buf_write_stream(*s, sz, GLOBAL_Stream[LOCAL_c_output_stream].encoding, 0);
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if (sno < 0)
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return FALSE;
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wglb.stream = GLOBAL_Stream+sno;
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wrputf(f, &wglb);
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so = Yap_MemExportStreamPtr(sno);
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Yap_CloseStream(sno);
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*s = so;
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return TRUE;
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}
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/* writes a data base reference */
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static void wrputref(CODEADDR ref, int Quote_illegal,
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struct write_globs *wglb) {
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char s[256];
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wrf stream = wglb->stream;
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putAtom(AtomDBref, Quote_illegal, wglb);
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#if defined(__linux__) || defined(__APPLE__)
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sprintf(s, "(%p," UInt_FORMAT ")", ref, ((LogUpdClause *)ref)->ClRefCount);
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#else
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sprintf(s, "(0x%p," UInt_FORMAT ")", ref, ((LogUpdClause *)ref)->ClRefCount);
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#endif
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wrputs(s, stream);
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lastw = alphanum;
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}
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/* writes a blob (default) */
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static int wrputblob(AtomEntry *ref, int Quote_illegal,
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struct write_globs *wglb) {
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wrf stream = wglb->stream;
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int rc;
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int Yap_write_blob(AtomEntry *ref, StreamDesc *stream);
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if ((rc = Yap_write_blob(ref, stream))) {
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return rc;
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}
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lastw = alphanum;
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return 1;
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}
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static int legalAtom(unsigned char *s) /* Is this a legal atom ? */
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{
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wchar_t ch = *s;
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if (ch == '\0')
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return FALSE;
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if (Yap_chtype[ch] != LC) {
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if (ch == '[') {
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return (s[1] == ']' && !s[2]);
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} else if (ch == '{') {
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return (s[1] == '}' && !s[2]);
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} else if (Yap_chtype[ch] == SL) {
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return (!s[1]);
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} else if ((ch == ',' || ch == '.') && !s[1]) {
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return FALSE;
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} else {
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if (ch == '/') {
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if (s[1] == '*')
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return FALSE;
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}
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while (ch) {
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if (Yap_chtype[ch] != SY) {
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return FALSE;
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}
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ch = *++s;
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}
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}
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return TRUE;
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} else
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while ((ch = *++s) != 0)
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if (Yap_chtype[ch] > NU)
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return FALSE;
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return (TRUE);
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}
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static wtype
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AtomIsSymbols(unsigned char *s) /* Is this atom just formed by symbols ? */
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{
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int ch;
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if (Yap_chtype[(int)s[0]] == SL && s[1] == '\0')
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return (separator);
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while ((ch = *s++) != '\0') {
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if (Yap_chtype[ch] != SY)
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return alphanum;
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}
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return symbol;
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}
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|
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static void write_quoted(wchar_t ch, wchar_t quote, wrf stream) {
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CACHE_REGS
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if (!(Yap_GetModuleEntry(CurrentModule)->flags & M_CHARESCAPE)) {
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wrputc(ch, stream);
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if (ch == '\'')
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wrputc('\'', stream); /* be careful about quotes */
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return;
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}
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if (!(ch < 0xff && chtype(ch) == BS) && ch != '\'' && ch != '\\' && ch != '`') {
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wrputc(ch, stream);
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} else {
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switch (ch) {
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case '\\':
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wrputc('\\', stream);
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wrputc('\\', stream);
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break;
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case '\'':
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if (ch == quote)
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wrputc('\\', stream);
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wrputc(ch, stream);
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break;
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case '"':
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if (ch == quote)
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wrputc('\\', stream);
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wrputc(ch, stream);
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break;
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case '`':
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if (ch == quote)
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wrputc('`', stream);
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wrputc(ch, stream);
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break;
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case 7:
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wrputc('\\', stream);
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wrputc('a', stream);
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break;
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case '\b':
|
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wrputc('\\', stream);
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wrputc('b', stream);
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break;
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case '\t':
|
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wrputc('\\', stream);
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wrputc('t', stream);
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break;
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case ' ':
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case 160:
|
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wrputc(' ', stream);
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break;
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case '\n':
|
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wrputc('\\', stream);
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wrputc('n', stream);
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break;
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case 11:
|
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wrputc('\\', stream);
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wrputc('v', stream);
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break;
|
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case '\r':
|
|
wrputc('\\', stream);
|
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wrputc('r', stream);
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break;
|
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case '\f':
|
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wrputc('\\', stream);
|
|
wrputc('f', stream);
|
|
break;
|
|
default:
|
|
if (ch <= 0xff) {
|
|
char esc[8];
|
|
|
|
/* last backslash in ISO mode */
|
|
sprintf(esc, "\\%03o\\", ch);
|
|
wrputs(esc, stream);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void write_string(const unsigned char *s,
|
|
struct write_globs *wglb) /* writes an integer */
|
|
{
|
|
StreamDesc *stream = wglb->stream;
|
|
utf8proc_int32_t chr, qt;
|
|
unsigned char *ptr = (unsigned char *) s;
|
|
|
|
if (wglb->Write_strings)
|
|
qt = '`';
|
|
else
|
|
qt = '"';
|
|
wrputc(qt, stream);
|
|
do {
|
|
ptr += get_utf8(ptr, &chr);
|
|
if (chr == '\0')
|
|
break;
|
|
write_quoted(chr, qt, stream);
|
|
} while (TRUE);
|
|
wrputc(qt, stream);
|
|
}
|
|
|
|
/* writes an atom */
|
|
static void putAtom(Atom atom, int Quote_illegal, struct write_globs *wglb) {
|
|
unsigned char *s;
|
|
wtype atom_or_symbol;
|
|
wrf stream = wglb->stream;
|
|
|
|
if (IsBlob(atom)) {
|
|
wrputblob(RepAtom(atom), Quote_illegal, wglb);
|
|
return;
|
|
}
|
|
if (IsWideAtom(atom)) {
|
|
wchar_t *ws = RepAtom(atom)->WStrOfAE;
|
|
|
|
if (Quote_illegal) {
|
|
wrputc('\'', stream);
|
|
while (*ws) {
|
|
wchar_t ch = *ws++;
|
|
write_quoted(ch, '\'', stream);
|
|
}
|
|
wrputc('\'', stream);
|
|
} else {
|
|
wrputws(ws, stream);
|
|
}
|
|
return;
|
|
}
|
|
s = (unsigned char *)RepAtom(atom)->StrOfAE;
|
|
/* #define CRYPT_FOR_STEVE 1*/
|
|
#ifdef CRYPT_FOR_STEVE
|
|
if (Yap_GetValue(AtomCryptAtoms) != TermNil &&
|
|
Yap_GetAProp(atom, OpProperty) == NIL) {
|
|
char s[16];
|
|
sprintf(s, "x%x", (CELL)s);
|
|
wrputs(s, stream);
|
|
return;
|
|
}
|
|
#endif
|
|
/* if symbol then last_minus is important */
|
|
last_minus = FALSE;
|
|
atom_or_symbol = AtomIsSymbols(s);
|
|
if (lastw == atom_or_symbol && atom_or_symbol != separator /* solo */)
|
|
wrputc(' ', stream);
|
|
lastw = atom_or_symbol;
|
|
if (Quote_illegal && !legalAtom(s)) {
|
|
wrputc('\'', stream);
|
|
while (*s) {
|
|
wchar_t ch = *s++;
|
|
write_quoted(ch, '\'', stream);
|
|
}
|
|
wrputc('\'', stream);
|
|
} else {
|
|
wrputs((char *)s, stream);
|
|
}
|
|
}
|
|
|
|
void Yap_WriteAtom(StreamDesc *s, Atom atom) {
|
|
struct write_globs wglb;
|
|
wglb.stream = s;
|
|
wglb.Quote_illegal = FALSE;
|
|
putAtom(atom, 0, &wglb);
|
|
}
|
|
|
|
static int IsCodesTerm(Term string) /* checks whether this is a string */
|
|
{
|
|
if (IsVarTerm(string))
|
|
return FALSE;
|
|
do {
|
|
Term hd;
|
|
int ch;
|
|
|
|
if (!IsPairTerm(string))
|
|
return (FALSE);
|
|
hd = HeadOfTerm(string);
|
|
if (IsVarTerm(hd))
|
|
return (FALSE);
|
|
if (!IsIntTerm(hd))
|
|
return (FALSE);
|
|
ch = IntOfTerm(HeadOfTerm(string));
|
|
if ((ch < ' ' || ch > MAX_ISO_LATIN1) && ch != '\n' && ch != '\t')
|
|
return (FALSE);
|
|
string = TailOfTerm(string);
|
|
if (IsVarTerm(string))
|
|
return (FALSE);
|
|
} while (string != TermNil);
|
|
return (TRUE);
|
|
}
|
|
|
|
/* writes a string */
|
|
static void putString(Term string, struct write_globs *wglb)
|
|
|
|
{
|
|
wrf stream = wglb->stream;
|
|
wrputc('"', stream);
|
|
while (string != TermNil) {
|
|
wchar_t ch = IntOfTerm(HeadOfTerm(string));
|
|
write_quoted(ch, '"', stream);
|
|
string = TailOfTerm(string);
|
|
}
|
|
wrputc('"', stream);
|
|
lastw = alphanum;
|
|
}
|
|
|
|
/* writes a string */
|
|
static void putUnquotedString(Term string, struct write_globs *wglb)
|
|
|
|
{
|
|
wrf stream = wglb->stream;
|
|
while (string != TermNil) {
|
|
int ch = IntOfTerm(HeadOfTerm(string));
|
|
wrputc(ch, stream);
|
|
string = TailOfTerm(string);
|
|
}
|
|
lastw = alphanum;
|
|
}
|
|
|
|
static Term from_pointer(CELL *ptr0, struct rewind_term *rwt,
|
|
struct write_globs *wglb) {
|
|
CACHE_REGS
|
|
Term t;
|
|
CELL *ptr = ptr0;
|
|
|
|
while (IsVarTerm(*ptr) && !IsUnboundVar(ptr))
|
|
ptr = (CELL *)*ptr;
|
|
t = *ptr;
|
|
if (wglb->Keep_terms) {
|
|
struct rewind_term *x = rwt->parent;
|
|
|
|
rwt->u_sd.s.old = Yap_InitSlot(t);
|
|
rwt->u_sd.s.ptr = Yap_InitSlot((CELL)ptr0);
|
|
|
|
if (!IsAtomicTerm(t) && !IsVarTerm(t)) {
|
|
while (x) {
|
|
if (Yap_GetDerefedFromSlot(x->u_sd.s.old PASS_REGS) == t)
|
|
return TermFoundVar;
|
|
x = x->parent;
|
|
}
|
|
}
|
|
} else {
|
|
rwt->u_sd.d.old = t;
|
|
rwt->u_sd.d.ptr = ptr0;
|
|
if (!IsVarTerm(t) && !IsAtomicTerm(t)) {
|
|
struct rewind_term *x = rwt->parent;
|
|
|
|
while (x) {
|
|
if (x->u_sd.d.old == t)
|
|
return TermFoundVar;
|
|
x = x->parent;
|
|
}
|
|
}
|
|
}
|
|
return t;
|
|
}
|
|
|
|
static CELL *restore_from_write(struct rewind_term *rwt,
|
|
struct write_globs *wglb) {
|
|
CACHE_REGS
|
|
CELL *ptr;
|
|
|
|
if (wglb->Keep_terms) {
|
|
ptr = (CELL *)Yap_GetPtrFromSlot(rwt->u_sd.s.ptr PASS_REGS);
|
|
Yap_RecoverSlots(2, rwt->u_sd.s.old PASS_REGS);
|
|
// printf("leak=%d %d\n", LOCALCurSlot,rwt->u_sd.s.old) ;
|
|
} else {
|
|
ptr = rwt->u_sd.d.ptr;
|
|
}
|
|
rwt->u_sd.s.ptr = 0;
|
|
return ptr;
|
|
}
|
|
|
|
/* writes an unbound variable */
|
|
static void write_var(CELL *t, struct write_globs *wglb,
|
|
struct rewind_term *rwt) {
|
|
CACHE_REGS
|
|
if (lastw == alphanum) {
|
|
wrputc(' ', wglb->stream);
|
|
}
|
|
wrputc('_', wglb->stream);
|
|
/* make sure we don't get no creepy spaces where they shouldn't be */
|
|
lastw = separator;
|
|
if (IsAttVar(t)) {
|
|
Int vcount = (t - H0);
|
|
if (wglb->Portray_delays) {
|
|
exts ext = ExtFromCell(t);
|
|
struct rewind_term nrwt;
|
|
nrwt.parent = rwt;
|
|
nrwt.u_sd.s.ptr = 0;
|
|
|
|
wglb->Portray_delays = FALSE;
|
|
if (ext == attvars_ext) {
|
|
attvar_record *attv = RepAttVar(t);
|
|
CELL *l = &attv->Value; /* dirty low-level hack, check atts.h */
|
|
|
|
wrputs("$AT(", wglb->stream);
|
|
write_var(t, wglb, rwt);
|
|
wrputc(',', wglb->stream);
|
|
writeTerm(from_pointer(l, &nrwt, wglb), 999, 1, FALSE, wglb, &nrwt);
|
|
l = restore_from_write(&nrwt, wglb);
|
|
wrputc(',', wglb->stream);
|
|
l++;
|
|
writeTerm(from_pointer(l, &nrwt, wglb), 999, 1, FALSE, wglb, &nrwt);
|
|
restore_from_write(&nrwt, wglb);
|
|
wrclose_bracket(wglb, TRUE);
|
|
}
|
|
wglb->Portray_delays = TRUE;
|
|
return;
|
|
}
|
|
wrputc('D', wglb->stream);
|
|
wrputn(vcount, wglb);
|
|
} else {
|
|
wrputn(((Int)(t - H0)), wglb);
|
|
}
|
|
}
|
|
|
|
static Term check_infinite_loop(Term t, struct rewind_term *x,
|
|
struct write_globs *wglb) {
|
|
CACHE_REGS
|
|
if (wglb->Keep_terms) {
|
|
while (x) {
|
|
if (Yap_GetFromSlot(x->u_sd.s.old) == t)
|
|
return TermFoundVar;
|
|
x = x->parent;
|
|
}
|
|
} else {
|
|
while (x) {
|
|
if (x->u_sd.d.old == t)
|
|
return TermFoundVar;
|
|
x = x->parent;
|
|
}
|
|
}
|
|
return t;
|
|
}
|
|
|
|
static void write_list(Term t, int direction, int depth,
|
|
struct write_globs *wglb, struct rewind_term *rwt) {
|
|
Term ti;
|
|
struct rewind_term nrwt;
|
|
nrwt.parent = rwt;
|
|
nrwt.u_sd.s.ptr = 0;
|
|
|
|
while (1) {
|
|
int ndirection;
|
|
int do_jump;
|
|
|
|
writeTerm(from_pointer(RepPair(t), &nrwt, wglb), 999, depth + 1, FALSE,
|
|
wglb, &nrwt);
|
|
t = AbsPair(restore_from_write(&nrwt, wglb));
|
|
ti = TailOfTerm(t);
|
|
if (IsVarTerm(ti))
|
|
break;
|
|
if (!IsPairTerm(ti) ||
|
|
!IsPairTerm((ti = check_infinite_loop(ti, rwt, wglb))))
|
|
break;
|
|
ndirection = RepPair(ti) - RepPair(t);
|
|
/* make sure we're not trapped in loops */
|
|
if (ndirection > 0) {
|
|
do_jump = (direction <= 0);
|
|
} else if (ndirection == 0) {
|
|
wrputc(',', wglb->stream);
|
|
putAtom(AtomFoundVar, wglb->Quote_illegal, wglb);
|
|
lastw = separator;
|
|
return;
|
|
} else {
|
|
do_jump = (direction >= 0);
|
|
}
|
|
if (wglb->MaxDepth != 0 && depth > wglb->MaxDepth) {
|
|
wrputc('|', wglb->stream);
|
|
putAtom(Atom3Dots, wglb->Quote_illegal, wglb);
|
|
return;
|
|
}
|
|
lastw = separator;
|
|
direction = ndirection;
|
|
depth++;
|
|
if (do_jump)
|
|
break;
|
|
wrputc(',', wglb->stream);
|
|
t = ti;
|
|
}
|
|
if (IsPairTerm(ti)) {
|
|
Term nt = from_pointer(RepPair(t) + 1, &nrwt, wglb);
|
|
/* we found an infinite loop */
|
|
if (IsAtomTerm(nt)) {
|
|
wrputc('|', wglb->stream);
|
|
writeTerm(nt, 999, depth, FALSE, wglb, rwt);
|
|
} else {
|
|
/* keep going on the list */
|
|
wrputc(',', wglb->stream);
|
|
write_list(nt, direction, depth, wglb, &nrwt);
|
|
}
|
|
restore_from_write(&nrwt, wglb);
|
|
} else if (ti != MkAtomTerm(AtomNil)) {
|
|
wrputc('|', wglb->stream);
|
|
lastw = separator;
|
|
writeTerm(from_pointer(RepPair(t) + 1, &nrwt, wglb), 999, depth, FALSE,
|
|
wglb, &nrwt);
|
|
restore_from_write(&nrwt, wglb);
|
|
}
|
|
}
|
|
|
|
static void writeTerm(Term t, int p, int depth, int rinfixarg,
|
|
struct write_globs *wglb, struct rewind_term *rwt)
|
|
/* term to write */
|
|
/* context priority */
|
|
|
|
{
|
|
CACHE_REGS
|
|
struct rewind_term nrwt;
|
|
nrwt.parent = rwt;
|
|
nrwt.u_sd.s.ptr = 0;
|
|
|
|
if (wglb->MaxDepth != 0 && depth > wglb->MaxDepth) {
|
|
putAtom(Atom3Dots, wglb->Quote_illegal, wglb);
|
|
return;
|
|
}
|
|
DBTerm *oEX = EX;
|
|
EX = NULL;
|
|
t = Deref(t);
|
|
if (IsVarTerm(t)) {
|
|
write_var((CELL *)t, wglb, &nrwt);
|
|
} else if (IsIntTerm(t)) {
|
|
|
|
wrputn((Int)IntOfTerm(t), wglb);
|
|
} else if (IsAtomTerm(t)) {
|
|
putAtom(AtomOfTerm(t), wglb->Quote_illegal, wglb);
|
|
} else if (IsPairTerm(t)) {
|
|
if (wglb->Ignore_ops) {
|
|
wrputs("'.'(", wglb->stream);
|
|
lastw = separator;
|
|
|
|
writeTerm(from_pointer(RepPair(t), &nrwt, wglb), 999, depth + 1, FALSE,
|
|
wglb, &nrwt);
|
|
t = AbsPair(restore_from_write(&nrwt, wglb));
|
|
wrputs(",", wglb->stream);
|
|
writeTerm(from_pointer(RepPair(t) + 1, &nrwt, wglb), 999, depth + 1,
|
|
FALSE, wglb, &nrwt);
|
|
restore_from_write(&nrwt, wglb);
|
|
wrclose_bracket(wglb, TRUE);
|
|
EX = oEX;
|
|
return;
|
|
}
|
|
if (wglb->Use_portray)
|
|
if (callPortray(t, &EX, wglb->stream-GLOBAL_Stream PASS_REGS)) {
|
|
EX = oEX;
|
|
return;
|
|
}
|
|
if (trueGlobalPrologFlag(WRITE_STRINGS_FLAG) && IsCodesTerm(t)) {
|
|
putString(t, wglb);
|
|
} else {
|
|
wrputc('[', wglb->stream);
|
|
lastw = separator;
|
|
/* we assume t was already saved in the stack */
|
|
write_list(t, 0, depth, wglb, rwt);
|
|
wrputc(']', wglb->stream);
|
|
lastw = separator;
|
|
}
|
|
} else { /* compound term */
|
|
Functor functor = FunctorOfTerm(t);
|
|
int Arity;
|
|
Atom atom;
|
|
int op, lp, rp;
|
|
|
|
if (IsExtensionFunctor(functor)) {
|
|
switch ((CELL)functor) {
|
|
case (CELL) FunctorDouble:
|
|
wrputf(FloatOfTerm(t), wglb);
|
|
return;
|
|
case (CELL) FunctorString:
|
|
write_string(UStringOfTerm(t), wglb);
|
|
return;
|
|
case (CELL) FunctorAttVar:
|
|
write_var(RepAppl(t) + 1, wglb, &nrwt);
|
|
return;
|
|
case (CELL) FunctorDBRef:
|
|
wrputref(RefOfTerm(t), wglb->Quote_illegal, wglb);
|
|
return;
|
|
case (CELL) FunctorLongInt:
|
|
wrputn(LongIntOfTerm(t), wglb);
|
|
return;
|
|
/* case (CELL)FunctorBigInt: */
|
|
default:
|
|
writebig(t, p, depth, rinfixarg, wglb, rwt);
|
|
return;
|
|
}
|
|
}
|
|
Arity = ArityOfFunctor(functor);
|
|
atom = NameOfFunctor(functor);
|
|
#ifdef SFUNC
|
|
if (Arity == SFArity) {
|
|
int argno = 1;
|
|
CELL *p = ArgsOfSFTerm(t);
|
|
putAtom(atom, wglb->Quote_illegal, wglb);
|
|
wropen_bracket(wglb, FALSE);
|
|
lastw = separator;
|
|
while (*p) {
|
|
Int sl = 0;
|
|
|
|
while (argno < *p) {
|
|
wrputc('_', wglb->stream), wrputc(',', wglb->stream);
|
|
++argno;
|
|
}
|
|
*p++;
|
|
lastw = separator;
|
|
/* cannot use the term directly with the SBA */
|
|
writeTerm(from_pointer(p, &nrwt, wglb), 999, depth + 1, FALSE, wglb,
|
|
&nrwt);
|
|
p = restore_from_write(&nrwt, wglb) + 1;
|
|
if (*p)
|
|
wrputc(',', wglb->stream);
|
|
argno++;
|
|
}
|
|
wrclose_bracket(wglb, TRUE);
|
|
return;
|
|
}
|
|
#endif
|
|
if (wglb->Use_portray) {
|
|
if (callPortray(t, &EX, wglb->stream-GLOBAL_Stream PASS_REGS)) {
|
|
EX = oEX;
|
|
return;
|
|
}
|
|
}
|
|
if (!wglb->Ignore_ops && Arity == 1 && Yap_IsPrefixOp(atom, &op, &rp)) {
|
|
Term tright = ArgOfTerm(1, t);
|
|
int bracket_right = !IsVarTerm(tright) && IsAtomTerm(tright) &&
|
|
Yap_IsOp(AtomOfTerm(tright));
|
|
if (op > p) {
|
|
wropen_bracket(wglb, TRUE);
|
|
}
|
|
putAtom(atom, wglb->Quote_illegal, wglb);
|
|
if (bracket_right) {
|
|
/* avoid stuff such as \+ (a,b) being written as \+(a,b) */
|
|
wropen_bracket(wglb, TRUE);
|
|
} else if (atom == AtomMinus) {
|
|
last_minus = TRUE;
|
|
}
|
|
writeTerm(from_pointer(RepAppl(t) + 1, &nrwt, wglb), rp, depth + 1, TRUE,
|
|
wglb, &nrwt);
|
|
restore_from_write(&nrwt, wglb);
|
|
if (bracket_right) {
|
|
wrclose_bracket(wglb, TRUE);
|
|
}
|
|
if (op > p) {
|
|
wrclose_bracket(wglb, TRUE);
|
|
}
|
|
} else if (!wglb->Ignore_ops &&
|
|
(Arity == 1 ||
|
|
((atom == AtomEmptyBrackets || atom == AtomEmptyCurlyBrackets ||
|
|
atom == AtomEmptySquareBrackets) &&
|
|
Yap_IsListTerm(ArgOfTerm(1, t)))) &&
|
|
Yap_IsPosfixOp(atom, &op, &lp)) {
|
|
Term tleft = ArgOfTerm(1, t);
|
|
|
|
int bracket_left, offset;
|
|
|
|
if (Arity != 1) {
|
|
tleft = ArgOfTerm(1, t);
|
|
offset = 2;
|
|
} else {
|
|
tleft = ArgOfTerm(1, t);
|
|
offset = 1;
|
|
}
|
|
bracket_left =
|
|
!IsVarTerm(tleft) && IsAtomTerm(tleft) && Yap_IsOp(AtomOfTerm(tleft));
|
|
if (op > p) {
|
|
/* avoid stuff such as \+ (a,b) being written as \+(a,b) */
|
|
wropen_bracket(wglb, TRUE);
|
|
}
|
|
if (bracket_left) {
|
|
wropen_bracket(wglb, TRUE);
|
|
}
|
|
writeTerm(from_pointer(RepAppl(t) + offset, &nrwt, wglb), lp, depth + 1,
|
|
rinfixarg, wglb, &nrwt);
|
|
restore_from_write(&nrwt, wglb);
|
|
if (bracket_left) {
|
|
wrclose_bracket(wglb, TRUE);
|
|
}
|
|
if (Arity > 1) {
|
|
if (atom == AtomEmptyBrackets) {
|
|
wrputc('(', wglb->stream);
|
|
} else if (atom == AtomEmptySquareBrackets) {
|
|
wrputc('[', wglb->stream);
|
|
} else if (atom == AtomEmptyCurlyBrackets) {
|
|
wrputc('{', wglb->stream);
|
|
}
|
|
lastw = separator;
|
|
write_list(tleft, 0, depth, wglb, rwt);
|
|
if (atom == AtomEmptyBrackets) {
|
|
wrputc(')', wglb->stream);
|
|
} else if (atom == AtomEmptySquareBrackets) {
|
|
wrputc(']', wglb->stream);
|
|
} else if (atom == AtomEmptyCurlyBrackets) {
|
|
wrputc('}', wglb->stream);
|
|
}
|
|
lastw = separator;
|
|
} else {
|
|
putAtom(atom, wglb->Quote_illegal, wglb);
|
|
}
|
|
if (op > p) {
|
|
wrclose_bracket(wglb, TRUE);
|
|
}
|
|
} else if (!wglb->Ignore_ops && Arity == 2 &&
|
|
Yap_IsInfixOp(atom, &op, &lp, &rp)) {
|
|
Term tleft = ArgOfTerm(1, t);
|
|
Term tright = ArgOfTerm(2, t);
|
|
int bracket_left =
|
|
!IsVarTerm(tleft) && IsAtomTerm(tleft) && Yap_IsOp(AtomOfTerm(tleft));
|
|
int bracket_right = !IsVarTerm(tright) && IsAtomTerm(tright) &&
|
|
Yap_IsOp(AtomOfTerm(tright));
|
|
|
|
if (op > p) {
|
|
/* avoid stuff such as \+ (a,b) being written as \+(a,b) */
|
|
wropen_bracket(wglb, TRUE);
|
|
lastw = separator;
|
|
}
|
|
if (bracket_left) {
|
|
wropen_bracket(wglb, TRUE);
|
|
}
|
|
writeTerm(from_pointer(RepAppl(t) + 1, &nrwt, wglb), lp, depth + 1,
|
|
rinfixarg, wglb, &nrwt);
|
|
t = AbsAppl(restore_from_write(&nrwt, wglb) - 1);
|
|
if (bracket_left) {
|
|
wrclose_bracket(wglb, TRUE);
|
|
}
|
|
/* avoid quoting commas and bars */
|
|
if (!strcmp((char *)RepAtom(atom)->StrOfAE, ",")) {
|
|
wrputc(',', wglb->stream);
|
|
lastw = separator;
|
|
} else if (!strcmp((char *)RepAtom(atom)->StrOfAE, "|")) {
|
|
wrputc('|', wglb->stream);
|
|
lastw = separator;
|
|
} else
|
|
putAtom(atom, wglb->Quote_illegal, wglb);
|
|
if (bracket_right) {
|
|
wropen_bracket(wglb, TRUE);
|
|
}
|
|
writeTerm(from_pointer(RepAppl(t) + 2, &nrwt, wglb), rp, depth + 1, TRUE,
|
|
wglb, &nrwt);
|
|
restore_from_write(&nrwt, wglb);
|
|
if (bracket_right) {
|
|
wrclose_bracket(wglb, TRUE);
|
|
}
|
|
if (op > p) {
|
|
wrclose_bracket(wglb, TRUE);
|
|
}
|
|
} else if (wglb->Handle_vars && functor == LOCAL_FunctorVar) {
|
|
Term ti = ArgOfTerm(1, t);
|
|
if (lastw == alphanum) {
|
|
wrputc(' ', wglb->stream);
|
|
}
|
|
if (!IsVarTerm(ti) &&
|
|
(IsIntTerm(ti) || IsCodesTerm(ti) || IsAtomTerm(ti))) {
|
|
if (IsIntTerm(ti)) {
|
|
Int k = IntOfTerm(ti);
|
|
if (k == -1) {
|
|
wrputc('_', wglb->stream);
|
|
lastw = alphanum;
|
|
return;
|
|
} else {
|
|
wrputc((k % 26) + 'A', wglb->stream);
|
|
if (k >= 26) {
|
|
/* make sure we don't get confused about our context */
|
|
lastw = separator;
|
|
wrputn(k / 26, wglb);
|
|
} else
|
|
lastw = alphanum;
|
|
}
|
|
} else if (IsAtomTerm(ti)) {
|
|
putAtom(AtomOfTerm(ti), FALSE, wglb);
|
|
} else {
|
|
putUnquotedString(ti, wglb);
|
|
}
|
|
} else {
|
|
wrputs("'$VAR'(", wglb->stream);
|
|
lastw = separator;
|
|
writeTerm(from_pointer(RepAppl(t) + 1, &nrwt, wglb), 999, depth + 1,
|
|
FALSE, wglb, &nrwt);
|
|
restore_from_write(&nrwt, wglb);
|
|
wrclose_bracket(wglb, TRUE);
|
|
}
|
|
} else if (!wglb->Ignore_ops && functor == FunctorBraces) {
|
|
wrputc('{', wglb->stream);
|
|
lastw = separator;
|
|
writeTerm(from_pointer(RepAppl(t) + 1, &nrwt, wglb), 1200, depth + 1,
|
|
FALSE, wglb, &nrwt);
|
|
restore_from_write(&nrwt, wglb);
|
|
wrputc('}', wglb->stream);
|
|
lastw = separator;
|
|
} else if (atom == AtomArray) {
|
|
wrputc('{', wglb->stream);
|
|
lastw = separator;
|
|
for (op = 1; op <= Arity; ++op) {
|
|
if (op == wglb->MaxArgs) {
|
|
wrputs("...", wglb->stream);
|
|
break;
|
|
}
|
|
writeTerm(from_pointer(RepAppl(t) + op, &nrwt, wglb), 999, depth + 1,
|
|
FALSE, wglb, &nrwt);
|
|
t = AbsAppl(restore_from_write(&nrwt, wglb) - op);
|
|
if (op != Arity) {
|
|
wrputc(',', wglb->stream);
|
|
lastw = separator;
|
|
}
|
|
}
|
|
wrputc('}', wglb->stream);
|
|
lastw = separator;
|
|
} else {
|
|
putAtom(atom, wglb->Quote_illegal, wglb);
|
|
lastw = separator;
|
|
wropen_bracket(wglb, FALSE);
|
|
for (op = 1; op <= Arity; ++op) {
|
|
if (op == wglb->MaxArgs) {
|
|
wrputc('.', wglb->stream);
|
|
wrputc('.', wglb->stream);
|
|
wrputc('.', wglb->stream);
|
|
break;
|
|
}
|
|
writeTerm(from_pointer(RepAppl(t) + op, &nrwt, wglb), 999, depth + 1,
|
|
FALSE, wglb, &nrwt);
|
|
restore_from_write(&nrwt, wglb);
|
|
if (op != Arity) {
|
|
wrputc(',', wglb->stream);
|
|
lastw = separator;
|
|
}
|
|
}
|
|
wrclose_bracket(wglb, TRUE);
|
|
}
|
|
}
|
|
EX = oEX;
|
|
}
|
|
|
|
void Yap_plwrite(Term t, StreamDesc *mywrite, int max_depth, int flags, int priority)
|
|
/* term to be written */
|
|
/* consumer */
|
|
/* write options */
|
|
{
|
|
CACHE_REGS
|
|
struct write_globs wglb;
|
|
struct rewind_term rwt;
|
|
yhandle_t sls = Yap_CurrentSlot(PASS_REGS1);
|
|
|
|
if (!mywrite) {
|
|
CACHE_REGS
|
|
wglb.stream = GLOBAL_Stream+LOCAL_c_error_stream;
|
|
} else
|
|
wglb.stream = mywrite;
|
|
wglb.lw = start;
|
|
wglb.last_atom_minus = FALSE;
|
|
wglb.Quote_illegal = flags & Quote_illegal_f;
|
|
wglb.Handle_vars = flags & Handle_vars_f;
|
|
wglb.Use_portray = flags & Use_portray_f;
|
|
wglb.Portray_delays = flags & AttVar_Portray_f;
|
|
wglb.MaxDepth = max_depth;
|
|
wglb.MaxArgs = max_depth;
|
|
/* notice: we must have ASP well set when using portray, otherwise
|
|
we cannot make recursive Prolog calls */
|
|
wglb.Keep_terms = (flags & (Use_portray_f | To_heap_f));
|
|
/* initialise wglb */
|
|
rwt.parent = NULL;
|
|
wglb.Ignore_ops = flags & Ignore_ops_f;
|
|
wglb.Write_strings = flags & BackQuote_String_f;
|
|
/* protect slots for portray */
|
|
writeTerm(from_pointer(&t, &rwt, &wglb), priority, 1, FALSE, &wglb, &rwt);
|
|
if (flags & New_Line_f) {
|
|
if (flags & Fullstop_f) {
|
|
wrputc('.', wglb.stream);
|
|
wrputc('\n', wglb.stream);
|
|
} else {
|
|
wrputc('\n', wglb.stream);
|
|
}
|
|
} else {
|
|
if (flags & Fullstop_f) {
|
|
wrputc('.', wglb.stream);
|
|
wrputc(' ', wglb.stream);
|
|
}
|
|
}
|
|
restore_from_write(&rwt, &wglb);
|
|
Yap_CloseSlots( sls );
|
|
}
|
|
|
|
|
|
char *
|
|
Yap_TermToString(Term t, char *s, size_t sz, size_t *length, encoding_t encp, int flags)
|
|
{
|
|
CACHE_REGS
|
|
int sno = Yap_open_buf_write_stream(s, sz, encp, flags);
|
|
int old_output_stream = LOCAL_c_output_stream;
|
|
|
|
if (sno < 0)
|
|
return NULL;
|
|
LOCK(GLOBAL_Stream[sno].streamlock);
|
|
LOCAL_c_output_stream = sno;
|
|
if (encp)
|
|
GLOBAL_Stream[sno].encoding = encp;
|
|
Yap_plwrite (t, GLOBAL_Stream+sno, 0, flags, 1200);
|
|
s[GLOBAL_Stream[sno].u.mem_string.pos] = '\0';
|
|
GLOBAL_Stream[sno].status = Free_Stream_f;
|
|
UNLOCK(GLOBAL_Stream[sno].streamlock);
|
|
LOCAL_c_output_stream = old_output_stream;
|
|
if ( EX == 0 ) return s;
|
|
return NULL;
|
|
}
|
|
|
|
|