527 lines
14 KiB
Prolog
527 lines
14 KiB
Prolog
|
|
/*************************************************************************
|
|
* *
|
|
* YAP Prolog *
|
|
* *
|
|
* Yap Prolog was developed at NCCUP - Universidade do Porto *
|
|
* *
|
|
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
|
|
* *
|
|
**************************************************************************
|
|
* *
|
|
* File: charcodes.c *
|
|
* Last rev: 5/2/88 *
|
|
* mods: *
|
|
* comments: Character codes and character conversion *
|
|
* *
|
|
*************************************************************************/
|
|
#ifdef SCCS
|
|
static char SccsId[] = "%W% %G%";
|
|
#endif
|
|
|
|
/*
|
|
* This file includes the definition of a pipe related IO.
|
|
*
|
|
*/
|
|
|
|
#include "Yap.h"
|
|
#include "Yatom.h"
|
|
#include "YapHeap.h"
|
|
#include "yapio.h"
|
|
#include <stdlib.h>
|
|
#if HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
#if HAVE_STDARG_H
|
|
#include <stdarg.h>
|
|
#endif
|
|
#ifdef _WIN32
|
|
#if HAVE_IO_H
|
|
/* Windows */
|
|
#include <io.h>
|
|
#endif
|
|
#if HAVE_SOCKET
|
|
#include <winsock2.h>
|
|
#endif
|
|
#include <windows.h>
|
|
#ifndef S_ISDIR
|
|
#define S_ISDIR(x) (((x)&_S_IFDIR)==_S_IFDIR)
|
|
#endif
|
|
#endif
|
|
#include "iopreds.h"
|
|
|
|
Term
|
|
Yap_StringToNumberTerm(char *s, encoding_t enc)
|
|
{
|
|
int sno;
|
|
Term t;
|
|
|
|
sno = Yap_open_buf_read_stream(s, strlen(s)+1, MEM_BUF_USER);
|
|
if (sno < 0)
|
|
return FALSE;
|
|
GLOBAL_Stream[sno].encoding = enc;
|
|
UNLOCK(GLOBAL_Stream[sno].streamlock);
|
|
while(*s && isblank(*s++));
|
|
t = Yap_scan_num(GLOBAL_Stream+sno);
|
|
GLOBAL_Stream[sno].status = Free_Stream_f;
|
|
if (t == TermNil) {
|
|
int sign = 1;
|
|
if (s[0] == '+') {
|
|
s++;
|
|
}
|
|
if (s[0] == '-') {
|
|
s++;
|
|
sign = -1;
|
|
}
|
|
if(strcmp(s,"inf") == 0) {
|
|
if (sign > 0) {
|
|
return MkFloatTerm(INFINITY);
|
|
} else {
|
|
return MkFloatTerm(-INFINITY);
|
|
}
|
|
}
|
|
if(strcmp(s,"nan") == 0) {
|
|
if (sign > 0) {
|
|
return MkFloatTerm(NAN);
|
|
} else {
|
|
return MkFloatTerm(-NAN);
|
|
}
|
|
}
|
|
}
|
|
return t;
|
|
}
|
|
|
|
Term
|
|
Yap_StringToTerm(const char *s, size_t len, encoding_t enc, int prio, Term *tp)
|
|
{
|
|
int sno = Yap_open_buf_read_stream(s, strlen(s)+1);
|
|
Term t;
|
|
TokEntry *tokstart;
|
|
tr_fr_ptr TR_before_parse;
|
|
Term tpos = TermNil;
|
|
read_data rd;
|
|
|
|
GLOBAL_Stream[sno].encoding = enc;
|
|
init_read_data(&rd, GLOBAL_Stream+sno);
|
|
if (sno < 0)
|
|
return FALSE;
|
|
UNLOCK(GLOBAL_Stream[sno].streamlock);
|
|
TR_before_parse = TR;
|
|
tokstart = LOCAL_tokptr = LOCAL_toktide = Yap_tokenizer(GLOBAL_Stream+sno, false, &tpos, &rd);
|
|
if (tokstart == NIL && tokstart->Tok == Ord (eot_tok)) {
|
|
if (tp) {
|
|
*tp = MkAtomTerm(AtomEOFBeforeEOT);
|
|
}
|
|
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable);
|
|
/* cannot actually use CloseStream, because we didn't allocate the buffer */
|
|
GLOBAL_Stream[sno].status = Free_Stream_f;
|
|
return FALSE;
|
|
} else if (LOCAL_ErrorMessage) {
|
|
if (tp) {
|
|
*tp = MkAtomTerm(Yap_LookupAtom(LOCAL_ErrorMessage));
|
|
}
|
|
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable);
|
|
/* cannot actually use CloseStream, because we didn't allocate the buffer */
|
|
GLOBAL_Stream[sno].status = Free_Stream_f;
|
|
return FALSE;
|
|
}
|
|
t = Yap_Parse(&rd);
|
|
TR = TR_before_parse;
|
|
if (!t && !LOCAL_ErrorMessage) {
|
|
if (tp) {
|
|
t = MkVarTerm();
|
|
*tp = syntax_error(tokstart, sno, &t);
|
|
}
|
|
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable);
|
|
/* cannot actually use CloseStream, because we didn't allocate the buffer */
|
|
GLOBAL_Stream[sno].status = Free_Stream_f;
|
|
return FALSE;
|
|
}
|
|
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable);
|
|
/* cannot actually use CloseStream, because we didn't allocate the buffer */
|
|
GLOBAL_Stream[sno].status = Free_Stream_f;
|
|
return t;
|
|
}
|
|
|
|
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);
|
|
if (sno < 0)
|
|
return FALSE;
|
|
GLOBAL_Stream[sno].encoding = enc;
|
|
UNLOCK(GLOBAL_Stream[sno].streamlock);
|
|
while(*s && isblank(*s++));
|
|
t = Yap_scan_num(GLOBAL_Stream+sno);
|
|
GLOBAL_Stream[sno].status = Free_Stream_f;
|
|
if (t == TermNil) {
|
|
int sign = 1;
|
|
if (s[0] == '+') {
|
|
s++;
|
|
}
|
|
if (s[0] == '-') {
|
|
s++;
|
|
sign = -1;
|
|
}
|
|
if(strcmp(s,"inf") == 0) {
|
|
if (sign > 0) {
|
|
return MkFloatTerm(INFINITY);
|
|
} else {
|
|
return MkFloatTerm(-INFINITY);
|
|
}
|
|
}
|
|
if(strcmp(s,"nan") == 0) {
|
|
if (sign > 0) {
|
|
return MkFloatTerm(NAN);
|
|
} else {
|
|
return MkFloatTerm(-NAN);
|
|
}
|
|
}
|
|
}
|
|
return t;
|
|
}
|
|
|
|
Term
|
|
Yap_StringToTerm(const char *s, size_t len, encoding_t enc, int prio, Term *tp)
|
|
{
|
|
int sno = Yap_open_buf_read_stream(s, strlen(s)+1);
|
|
Term t;
|
|
TokEntry *tokstart;
|
|
tr_fr_ptr TR_before_parse;
|
|
Term tpos = TermNil;
|
|
read_data rd;
|
|
|
|
GLOBAL_Stream[sno].encoding = enc;
|
|
init_read_data(&rd, GLOBAL_Stream+sno);
|
|
if (sno < 0)
|
|
return FALSE;
|
|
UNLOCK(GLOBAL_Stream[sno].streamlock);
|
|
TR_before_parse = TR;
|
|
tokstart = LOCAL_tokptr = LOCAL_toktide = Yap_tokenizer(GLOBAL_Stream+sno, false, &tpos, &rd);
|
|
if (tokstart == NIL && tokstart->Tok == Ord (eot_tok)) {
|
|
if (tp) {
|
|
*tp = MkAtomTerm(AtomEOFBeforeEOT);
|
|
}
|
|
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable);
|
|
/* cannot actually use CloseStream, because we didn't allocate the buffer */
|
|
GLOBAL_Stream[sno].status = Free_Stream_f;
|
|
return FALSE;
|
|
} else if (LOCAL_ErrorMessage) {
|
|
if (tp) {
|
|
*tp = MkAtomTerm(Yap_LookupAtom(LOCAL_ErrorMessage));
|
|
}
|
|
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable);
|
|
/* cannot actually use CloseStream, because we didn't allocate the buffer */
|
|
GLOBAL_Stream[sno].status = Free_Stream_f;
|
|
return FALSE;
|
|
}
|
|
t = Yap_Parse(&rd);
|
|
TR = TR_before_parse;
|
|
if (!t && !LOCAL_ErrorMessage) {
|
|
if (tp) {
|
|
t = MkVarTerm();
|
|
*tp = syntax_error(tokstart, sno, &t);
|
|
}
|
|
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable);
|
|
/* cannot actually use CloseStream, because we didn't allocate the buffer */
|
|
GLOBAL_Stream[sno].status = Free_Stream_f;
|
|
return FALSE;
|
|
}
|
|
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable);
|
|
/* cannot actually use CloseStream, because we didn't allocate the buffer */
|
|
GLOBAL_Stream[sno].status = Free_Stream_f;
|
|
return t;
|
|
}
|
|
|
|
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);
|
|
int old_output_stream = LOCAL_output_stream;
|
|
|
|
if (sno < 0)
|
|
return NULL;
|
|
LOCAL_output_stream = sno;
|
|
if (encp)
|
|
GLOBAL_Stream[sno].encoding = encp;
|
|
Yap_plwrite (t, GLOBAL_Stream[sno].stream_wputc, 0, flags, 1200);
|
|
s[GLOBAL_Stream[sno].u.mem_string.pos] = '\0';
|
|
LOCK(GLOBAL_Stream[sno].streamlock);
|
|
GLOBAL_Stream[sno].status = Free_Stream_f;
|
|
UNLOCK(GLOBAL_Stream[sno].streamlock);
|
|
LOCAL_output_stream = old_output_stream;
|
|
if ( EX == 0 ) return s;
|
|
return NULL;
|
|
}
|
|
|
|
encoding_t
|
|
Yap_DefaultEncoding(void)
|
|
{
|
|
return LOCAL_encoding;
|
|
}
|
|
|
|
void
|
|
Yap_SetDefaultEncoding(encoding_t new_encoding)
|
|
{
|
|
LOCAL_encoding = new_encoding;
|
|
}
|
|
|
|
encoding_t
|
|
Yap_InitialEncoding(void)
|
|
{
|
|
char *s = getenv("LANG");
|
|
size_t sz;
|
|
|
|
/* if we don't have a LANG then just use ISO_LATIN1 */
|
|
if (s == NULL)
|
|
s = getenv("LC_CTYPE");
|
|
if (s == NULL)
|
|
return ENC_ISO_LATIN1;
|
|
sz = strlen(s);
|
|
if (sz >= 5) {
|
|
if (s[sz-5] == 'U' &&
|
|
s[sz-4] == 'T' &&
|
|
s[sz-3] == 'F' &&
|
|
s[sz-2] == '-' &&
|
|
s[sz-1] == '8') {
|
|
return ENC_ISO_UTF8;
|
|
}
|
|
}
|
|
return ENC_ISO_ANSI;
|
|
}
|
|
|
|
|
|
static Int
|
|
toupper( USES_REGS1 )
|
|
{
|
|
Int out = IntegerOfTerm(Deref(ARG1)), uout;
|
|
if (out < 0) {
|
|
Yap_Error(REPRESENTATION_ERROR_CHARACTER_CODE, ARG1, "toupper");
|
|
return FALSE;
|
|
}
|
|
if (out < 128)
|
|
uout = toupper(out);
|
|
else
|
|
uout = towupper(out);
|
|
return Yap_unify(ARG2, MkIntegerTerm(uout));
|
|
}
|
|
|
|
static Int
|
|
tolower( USES_REGS1 )
|
|
{
|
|
Int out = IntegerOfTerm(Deref(ARG1)), uout;
|
|
if (out < 0) {
|
|
Yap_Error(REPRESENTATION_ERROR_CHARACTER_CODE, ARG1, "tolower");
|
|
return FALSE;
|
|
}
|
|
if (out < 128)
|
|
uout = tolower(out);
|
|
else
|
|
uout = towlower(out);
|
|
return Yap_unify(ARG2, MkIntegerTerm(uout));
|
|
}
|
|
|
|
static Int
|
|
p_change_type_of_char ( USES_REGS1 )
|
|
{ /* change_type_of_char(+char,+type) */
|
|
Term t1 = Deref (ARG1);
|
|
Term t2 = Deref (ARG2);
|
|
if (!IsVarTerm (t1) && !IsIntegerTerm (t1))
|
|
return FALSE;
|
|
if (!IsVarTerm(t2) && !IsIntegerTerm(t2))
|
|
return FALSE;
|
|
Yap_chtype[IntegerOfTerm(t1)] = IntegerOfTerm(t2);
|
|
return TRUE;
|
|
}
|
|
|
|
static Int
|
|
p_type_of_char ( USES_REGS1 )
|
|
{ /* type_of_char(+char,-type) */
|
|
Term t;
|
|
|
|
Term t1 = Deref (ARG1);
|
|
if (!IsVarTerm (t1) && !IsIntegerTerm (t1))
|
|
return FALSE;
|
|
t = MkIntTerm(Yap_chtype[IntegerOfTerm (t1)]);
|
|
return Yap_unify(t,ARG2);
|
|
}
|
|
|
|
|
|
|
|
static Int
|
|
p_force_char_conversion( USES_REGS1 )
|
|
{
|
|
int i;
|
|
|
|
/* don't actually enable it until someone tries to add a conversion */
|
|
if (CharConversionTable2 == NULL)
|
|
return(TRUE);
|
|
for (i = 0; i < MaxStreams; i++) {
|
|
if (!(GLOBAL_Stream[i].status & Free_Stream_f))
|
|
GLOBAL_Stream[i].stream_wgetc_for_read = ISOWGetc;
|
|
}
|
|
CharConversionTable = CharConversionTable2;
|
|
return(TRUE);
|
|
}
|
|
|
|
static Int
|
|
p_disable_char_conversion( USES_REGS1 )
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < MaxStreams; i++) {
|
|
if (!(GLOBAL_Stream[i].status & Free_Stream_f))
|
|
GLOBAL_Stream[i].stream_wgetc_for_read = GLOBAL_Stream[i].stream_wgetc;
|
|
}
|
|
CharConversionTable = NULL;
|
|
return(TRUE);
|
|
}
|
|
|
|
static Int
|
|
char_conversion( USES_REGS1 )
|
|
{
|
|
Term t0 = Deref(ARG1), t1 = Deref(ARG2);
|
|
char *s0, *s1;
|
|
|
|
if (IsVarTerm(t0)) {
|
|
Yap_Error(INSTANTIATION_ERROR, t0, "char_conversion/2");
|
|
return (FALSE);
|
|
}
|
|
if (!IsAtomTerm(t0)) {
|
|
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "char_conversion/2");
|
|
return (FALSE);
|
|
}
|
|
s0 = RepAtom(AtomOfTerm(t0))->StrOfAE;
|
|
if (s0[1] != '\0') {
|
|
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "char_conversion/2");
|
|
return (FALSE);
|
|
}
|
|
if (IsVarTerm(t1)) {
|
|
Yap_Error(INSTANTIATION_ERROR, t1, "char_conversion/2");
|
|
return (FALSE);
|
|
}
|
|
if (!IsAtomTerm(t1)) {
|
|
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "char_conversion/2");
|
|
return (FALSE);
|
|
}
|
|
s1 = RepAtom(AtomOfTerm(t1))->StrOfAE;
|
|
if (s1[1] != '\0') {
|
|
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "char_conversion/2");
|
|
return (FALSE);
|
|
}
|
|
/* check if we do have a table for converting characters */
|
|
if (CharConversionTable2 == NULL) {
|
|
int i;
|
|
|
|
/* don't create a table if we don't need to */
|
|
if (s0[0] == s1[0])
|
|
return(TRUE);
|
|
CharConversionTable2 = Yap_AllocCodeSpace(NUMBER_OF_CHARS*sizeof(char));
|
|
while (CharConversionTable2 == NULL) {
|
|
if (!Yap_growheap(FALSE, NUMBER_OF_CHARS*sizeof(char), NULL)) {
|
|
Yap_Error(RESOURCE_ERROR_HEAP, TermNil, LOCAL_ErrorMessage);
|
|
return(FALSE);
|
|
}
|
|
}
|
|
if (truePrologFlag(CHAR_CONVERSION_FLAG)) {
|
|
if (p_force_char_conversion() == FALSE)
|
|
return(FALSE);
|
|
}
|
|
for (i = 0; i < NUMBER_OF_CHARS; i++)
|
|
CharConversionTable2[i] = i;
|
|
}
|
|
/* just add the new entry */
|
|
CharConversionTable2[(int)s0[0]] = s1[0];
|
|
/* done */
|
|
return(TRUE);
|
|
}
|
|
|
|
static Int
|
|
p_current_char_conversion( USES_REGS1 )
|
|
{
|
|
Term t0, t1;
|
|
char *s0, *s1;
|
|
|
|
if (CharConversionTable == NULL) {
|
|
return(FALSE);
|
|
}
|
|
t0 = Deref(ARG1);
|
|
if (IsVarTerm(t0)) {
|
|
Yap_Error(INSTANTIATION_ERROR, t0, "current_char_conversion/2");
|
|
return (FALSE);
|
|
}
|
|
if (!IsAtomTerm(t0)) {
|
|
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "current_char_conversion/2");
|
|
return (FALSE);
|
|
}
|
|
s0 = RepAtom(AtomOfTerm(t0))->StrOfAE;
|
|
if (s0[1] != '\0') {
|
|
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "current_char_conversion/2");
|
|
return (FALSE);
|
|
}
|
|
t1 = Deref(ARG2);
|
|
if (IsVarTerm(t1)) {
|
|
char out[2];
|
|
if (CharConversionTable[(int)s0[0]] == '\0') return(FALSE);
|
|
out[0] = CharConversionTable[(int)s0[0]];
|
|
out[1] = '\0';
|
|
return(Yap_unify(ARG2,MkAtomTerm(Yap_LookupAtom(out))));
|
|
}
|
|
if (!IsAtomTerm(t1)) {
|
|
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "current_char_conversion/2");
|
|
return (FALSE);
|
|
}
|
|
s1 = RepAtom(AtomOfTerm(t1))->StrOfAE;
|
|
if (s1[1] != '\0') {
|
|
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "current_char_conversion/2");
|
|
return (FALSE);
|
|
} else {
|
|
return (CharConversionTable[(int)s0[0]] == '\0' &&
|
|
CharConversionTable[(int)s0[0]] == s1[0] );
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_all_char_conversions( USES_REGS1 )
|
|
{
|
|
Term out = TermNil;
|
|
int i;
|
|
|
|
if (CharConversionTable == NULL) {
|
|
return(FALSE);
|
|
}
|
|
for (i = NUMBER_OF_CHARS; i > 0; ) {
|
|
i--;
|
|
if (CharConversionTable[i] != '\0') {
|
|
Term t1, t2;
|
|
char s[2];
|
|
s[1] = '\0';
|
|
s[0] = CharConversionTable[i];
|
|
t1 = MkAtomTerm(Yap_LookupAtom(s));
|
|
out = MkPairTerm(t1,out);
|
|
s[0] = i;
|
|
t2 = MkAtomTerm(Yap_LookupAtom(s));
|
|
out = MkPairTerm(t2,out);
|
|
}
|
|
}
|
|
return(Yap_unify(ARG1,out));
|
|
}
|
|
|
|
|
|
void
|
|
Yap_InitChtypes(void)
|
|
{
|
|
Yap_InitCPred ("$change_type_of_char", 2, p_change_type_of_char, SafePredFlag|SyncPredFlag|HiddenPredFlag);
|
|
Yap_InitCPred ("$type_of_char", 2, p_type_of_char, SafePredFlag|SyncPredFlag|HiddenPredFlag);
|
|
Yap_InitCPred ("toupper", 2, toupper, SafePredFlag|HiddenPredFlag);
|
|
Yap_InitCPred ("tolower", 2, tolower, SafePredFlag|HiddenPredFlag);
|
|
Yap_InitCPred ("char_conversion", 2, char_conversion, SyncPredFlag);
|
|
Yap_InitCPred ("$current_char_conversion", 2, p_current_char_conversion, SyncPredFlag|HiddenPredFlag);
|
|
Yap_InitCPred ("$all_char_conversions", 1, p_all_char_conversions, SyncPredFlag|HiddenPredFlag);
|
|
Yap_InitCPred ("$force_char_conversion", 0, p_force_char_conversion, SyncPredFlag|HiddenPredFlag);
|
|
Yap_InitCPred ("$disable_char_conversion", 0, p_disable_char_conversion, SyncPredFlag|HiddenPredFlag);
|
|
|
|
}
|