This repository has been archived on 2023-08-20. You can view files and clone it, but cannot push or open issues or pull requests.
yap-6.3/library/dialect/swi/os/pl-read.c

1528 lines
40 KiB
C
Raw Normal View History

#include "pl-ctype.h"
#include "pl-dtoa.h"
2016-12-04 18:52:42 +00:00
#include "pl-incl.h"
#include "pl-umap.c" /* Unicode map */
#include "pl-utf8.h"
2016-12-04 18:52:42 +00:00
#include "pl-read.h" /* read structure */
/**
* @defgroup ReadTerm Read Term from Streams
* @ingroup InputOutput
* @{
*/
2016-12-04 18:52:42 +00:00
static bool isStringStream(IOSTREAM *s) {
return s->functions == &Sstringfunctions;
}
2016-12-04 18:52:42 +00:00
void init_read_data(ReadData _PL_rd, IOSTREAM *in ARG_LD) {
CACHE_REGS
memset(_PL_rd, 0, sizeof(*_PL_rd)); /* optimise! */
_PL_rd->magic = RD_MAGIC;
_PL_rd->varnames = 0;
_PL_rd->module = Yap_GetModuleEntry(CurrentModule);
_PL_rd->exception = 0;
_PL_rd->stream = in;
_PL_rd->has_exception = 0;
_PL_rd->module = MODULE_parse;
2016-12-04 18:52:42 +00:00
_PL_rd->flags = _PL_rd->module->flags; /* change for options! */
_PL_rd->styleCheck = LOCAL_debugstatus.styleCheck;
_PL_rd->on_error = AtomError;
_PL_rd->backquoted_string = truePrologFlag(PLFLAG_BACKQUOTED_STRING);
}
2016-12-04 18:52:42 +00:00
void free_read_data(ReadData _PL_rd) {}
2016-12-04 18:52:42 +00:00
static int read_term(term_t t, ReadData _PL_rd ARG_LD) {
return Yap_read_term(t, rb.stream, _PL_rd);
}
2016-12-04 18:52:42 +00:00
static void addUTF8Buffer(Buffer b, int c);
2016-12-04 18:52:42 +00:00
static void addUTF8Buffer(Buffer b, int c) {
if (c >= 0x80) {
char buf[6];
char *p, *end;
2016-12-04 18:52:42 +00:00
end = utf8_put_char(buf, c);
for (p = buf; p < end; p++) {
addBuffer(b, *p & 0xff, char);
}
2016-12-04 18:52:42 +00:00
} else {
addBuffer(b, c, char);
}
}
/*******************************
* UNICODE CLASSIFIERS *
*******************************/
2016-12-04 18:52:42 +00:00
#define CharTypeW(c, t, w) \
((unsigned)(c) <= 0xff ? (_PL_char_types[(unsigned)(c)] t) \
: (uflagsW(c) & (w)))
#define PlBlankW(c) CharTypeW(c, == SP, U_SEPARATOR)
#define PlUpperW(c) CharTypeW(c, == UC, U_UPPERCASE)
#define PlIdStartW(c) \
(c <= 0xff ? (isLower(c) || isUpper(c) || c == '_') : uflagsW(c) & U_ID_START)
#define PlIdContW(c) CharTypeW(c, >= UC, U_ID_CONTINUE)
#define PlSymbolW(c) CharTypeW(c, == SY, U_SYMBOL)
#define PlPunctW(c) CharTypeW(c, == PU, 0)
#define PlSoloW(c) CharTypeW(c, == SO, U_OTHER)
#define PlInvalidW(c) (uflagsW(c) == 0)
int f_is_prolog_var_start(wint_t c) {
return PlIdStartW(c) && (PlUpperW(c) || c == '_');
}
2016-12-04 18:52:42 +00:00
int f_is_prolog_atom_start(wint_t c) { return PlIdStartW(c) != 0; }
2016-12-04 18:52:42 +00:00
int f_is_prolog_identifier_continue(wint_t c) {
return PlIdContW(c) || c == '_';
}
2016-12-04 18:52:42 +00:00
int f_is_prolog_symbol(wint_t c) { return PlSymbolW(c) != 0; }
2016-12-04 18:52:42 +00:00
int unicode_separator(pl_wchar_t c) { return PlBlankW(c); }
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
FALSE return false
TRUE redo
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
2016-12-04 18:52:42 +00:00
static int reportReadError(ReadData rd) {
if (rd->on_error == ATOM_error)
return PL_raise_exception(rd->exception);
2016-12-04 18:52:42 +00:00
if (rd->on_error != ATOM_quiet)
printMessage(ATOM_error, PL_TERM, rd->exception);
PL_clear_exception();
2016-12-04 18:52:42 +00:00
if (rd->on_error == ATOM_dec10)
return TRUE;
return FALSE;
}
/* static int */
2016-12-04 18:52:42 +00:00
/* reportSingletons(ReadData rd, singletons, Atom amod, Atom aname, UInt arity)
*/
/* { */
/* printMessage(ATOM_warning, PL_FUNCTOR_CHARS, */
/* "singletons", 2, */
/* PL_TERM, singletons, */
/* PL_TERM, mod, */
/* PL_FUNCTOR_divide2, */
/* PL_ATOM, name, */
/* PL_INT, arity); */
/* return FALSE; */
/* } */
/********************************
* RAW READING *
*********************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Scan the input, give prompts when necessary and return a char * holding
a stripped version of the next term. Contiguous white space is mapped
on a single space, block and % ... \n comment is deleted. Memory is
claimed automatically en enlarged if necessary.
(char *) NULL is returned on a syntax error.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
2016-12-04 18:52:42 +00:00
#define syntaxError(what, rd) \
{ \
errorWarning(what, 0, rd); \
fail; \
}
2016-12-04 18:52:42 +00:00
static term_t makeErrorTerm(const char *id_str, term_t id_term,
ReadData _PL_rd) {
GET_LD
term_t ex, loc = 0; /* keep compiler happy */
unsigned char const *s, *ll = NULL;
int rc = TRUE;
2016-12-04 18:52:42 +00:00
if (!(ex = PL_new_term_ref()) || !(loc = PL_new_term_ref()))
rc = FALSE;
2016-12-04 18:52:42 +00:00
if (rc && !id_term) {
if (!(id_term = PL_new_term_ref()) || !PL_put_atom_chars(id_term, id_str))
rc = FALSE;
}
2016-12-04 18:52:42 +00:00
if (rc)
rc = PL_unify_term(ex, PL_FUNCTOR, FUNCTOR_error2, PL_FUNCTOR,
FUNCTOR_syntax_error1, PL_TERM, id_term, PL_TERM, loc);
source_char_no += last_token_start - rdbase;
2016-12-04 18:52:42 +00:00
for (s = rdbase; s < last_token_start; s++) {
if (*s == '\n') {
source_line_no++;
ll = s + 1;
}
2016-12-04 18:52:42 +00:00
}
2016-12-04 18:52:42 +00:00
if (ll) {
int lp = 0;
for (s = ll; s < last_token_start; s++) {
switch (*s) {
case '\b':
if (lp > 0)
lp--;
break;
case '\t':
lp |= 7;
default:
lp++;
}
}
2016-12-04 18:52:42 +00:00
source_line_pos = lp;
}
if (rc) {
if (ReadingSource) /* reading a file */
{
rc = PL_unify_term(loc, PL_FUNCTOR, FUNCTOR_file4, PL_ATOM,
source_file_name, PL_INT, source_line_no, PL_INT,
source_line_pos, PL_INT64, source_char_no);
} else if (isStringStream(rb.stream)) {
size_t pos;
pos = utf8_strlen((char *)rdbase, last_token_start - rdbase);
rc = PL_unify_term(loc, PL_FUNCTOR, FUNCTOR_string2, PL_UTF8_STRING,
rdbase, PL_INT, (int)pos);
} else /* any stream */
{
term_t stream;
if (!(stream = PL_new_term_ref()) ||
!PL_unify_stream_or_alias(stream, rb.stream) ||
!PL_unify_term(loc, PL_FUNCTOR, FUNCTOR_stream4, PL_TERM, stream,
PL_INT, source_line_no, PL_INT, source_line_pos,
PL_INT64, source_char_no))
rc = FALSE;
}
2016-12-04 18:52:42 +00:00
}
return (rc ? ex : (term_t)0);
}
2016-12-04 18:52:42 +00:00
static bool errorWarning(const char *id_str, term_t id_term, ReadData _PL_rd) {
GET_LD
term_t ex;
2016-12-04 18:52:42 +00:00
LD->exception.processing = TRUE; /* allow using spare stack */
ex = makeErrorTerm(id_str, id_term, _PL_rd);
2016-12-04 18:52:42 +00:00
if (_PL_rd) {
_PL_rd->has_exception = TRUE;
if (ex)
PL_put_term(_PL_rd->exception, ex);
else
PL_put_term(_PL_rd->exception, exception_term);
} else {
if (ex)
PL_raise_exception(ex);
}
fail;
}
2016-12-04 18:52:42 +00:00
static void clearBuffer(ReadData _PL_rd) {
if (rb.size == 0) {
rb.base = rb.fast;
rb.size = sizeof(rb.fast);
}
rb.end = rb.base + rb.size;
rdbase = rb.here = rb.base;
_PL_rd->posp = rdbase;
_PL_rd->posi = 0;
}
2016-12-04 18:52:42 +00:00
static void growToBuffer(int c, ReadData _PL_rd) {
if (rb.base == rb.fast) /* intptr_t clause: jump to use malloc() */
{
rb.base = PL_malloc(FASTBUFFERSIZE * 2);
memcpy(rb.base, rb.fast, FASTBUFFERSIZE);
} else
rb.base = PL_realloc(rb.base, rb.size * 2);
2016-12-04 18:52:42 +00:00
DEBUG(8, Sdprintf("Reallocated read buffer at %ld\n", (intptr_t)rb.base));
_PL_rd->posp = rdbase = rb.base;
rb.here = rb.base + rb.size;
rb.size *= 2;
2016-12-04 18:52:42 +00:00
rb.end = rb.base + rb.size;
_PL_rd->posi = 0;
*rb.here++ = c;
}
2016-12-04 18:52:42 +00:00
static inline void addByteToBuffer(int c, ReadData _PL_rd) {
c &= 0xff;
2016-12-04 18:52:42 +00:00
if (rb.here >= rb.end)
growToBuffer(c, _PL_rd);
else
*rb.here++ = c;
}
2016-12-04 18:52:42 +00:00
static void addToBuffer(int c, ReadData _PL_rd) {
if (c <= 0x7f) {
addByteToBuffer(c, _PL_rd);
} else {
char buf[10];
char *s, *e;
2016-12-04 18:52:42 +00:00
e = utf8_put_char(buf, c);
for (s = buf; s < e; s++)
addByteToBuffer(*s, _PL_rd);
}
}
#if __YAP_PROLOG__
2016-12-04 18:52:42 +00:00
void Yap_setCurrentSourceLocation(void *rd) {
GET_LD
2016-12-04 18:52:42 +00:00
setCurrentSourceLocation(rd PASS_LD);
}
#endif
2016-12-04 18:52:42 +00:00
static inline int getchr__(ReadData _PL_rd) {
int c = Sgetcode(rb.stream);
2016-12-04 18:52:42 +00:00
if (!_PL_rd->char_conversion_table || c < 0 || c >= 256)
return c;
return _PL_rd->char_conversion_table[c];
}
2016-12-04 18:52:42 +00:00
#define getchr() getchr__(_PL_rd)
#define getchrq() Sgetcode(rb.stream)
2016-12-04 18:52:42 +00:00
#define ensure_space(c) \
{ \
if (something_read && (c == '\n' || !isBlank(rb.here[-1]))) \
addToBuffer(c, _PL_rd); \
}
2016-12-04 18:52:42 +00:00
#define set_start_line \
{ \
if (!something_read) { \
setCurrentSourceLocation(_PL_rd PASS_LD); \
something_read++; \
} \
}
#ifdef O_QUASIQUOTATIONS
/** '$qq_open'(+QQRange, -Stream) is det.
Opens a quasi-quoted memory range.
@arg QQRange is a term '$quasi_quotation'(ReadData, Start, Length)
@arg Stream is a UTF-8 encoded string, whose position indication
reflects the location in the real file.
*/
2016-12-04 18:52:42 +00:00
static PRED_IMPL("$qq_open", 2, qq_open, 0) {
PRED_LD
if (PL_is_functor(A1, FUNCTOR_dquasi_quotation3)) {
void *ptr;
char *start;
size_t len;
term_t arg = PL_new_term_ref();
IOSTREAM *s;
if (PL_get_arg(1, A1, arg) && PL_get_pointer_ex(arg, &ptr) &&
PL_get_arg(2, A1, arg) && PL_get_intptr(arg, (intptr_t *)&start) &&
PL_get_arg(3, A1, arg) &&
PL_get_intptr(arg, (intptr_t *)&len)) { // source_location pos;
if ((s = Sopenmem(&start, &len, "r")))
s->encoding = ENC_UTF8;
return PL_unify_stream(A2, s);
}
} else
PL_type_error("read_context", A1);
return FALSE;
}
2016-12-04 18:52:42 +00:00
static int parse_quasi_quotations(ReadData _PL_rd ARG_LD) {
if (_PL_rd->qq_tail) {
term_t av;
int rc;
2016-12-04 18:52:42 +00:00
if (!PL_unify_nil(_PL_rd->qq_tail))
return FALSE;
2016-12-04 18:52:42 +00:00
if (!_PL_rd->quasi_quotations) {
if ((av = PL_new_term_refs(2)) && PL_put_term(av + 0, _PL_rd->qq) &&
#if __YAP_PROLOG__
2016-12-04 18:52:42 +00:00
PL_put_atom(av + 1, YAP_SWIAtomFromAtom(_PL_rd->module->AtomOfME)) &&
#else
2016-12-04 18:52:42 +00:00
PL_put_atom(av + 1, _PL_rd->module->name) &&
#endif
2016-12-04 18:52:42 +00:00
PL_cons_functor_v(av, FUNCTOR_dparse_quasi_quotations2, av)) {
term_t ex;
rc = callProlog(MODULE_system, av + 0, PL_Q_CATCH_EXCEPTION, &ex);
if (rc)
return TRUE;
_PL_rd->exception = ex;
_PL_rd->has_exception = TRUE;
}
return FALSE;
} else
2016-12-04 18:52:42 +00:00
return TRUE;
} else if (_PL_rd->quasi_quotations) /* user option, but no quotes */
{
return PL_unify_nil(_PL_rd->quasi_quotations);
} else
return TRUE;
}
#endif /*O_QUASIQUOTATIONS*/
2016-12-04 18:52:42 +00:00
#define rawSyntaxError(what) \
{ \
addToBuffer(EOS, _PL_rd); \
rdbase = rb.base, last_token_start = rb.here - 1; \
syntaxError(what, _PL_rd); \
}
2016-12-04 18:52:42 +00:00
static int raw_read_quoted(int q, ReadData _PL_rd) {
int newlines = 0;
int c;
addToBuffer(q, _PL_rd);
2016-12-04 18:52:42 +00:00
while ((c = getchrq()) != EOF && c != q) {
if (c == '\\' && DO_CHARESCAPE) {
int base;
addToBuffer(c, _PL_rd);
2016-12-04 18:52:42 +00:00
switch ((c = getchrq())) {
case EOF:
goto eofinstr;
case 'u': /* \uXXXX */
case 'U': /* \UXXXXXXXX */
addToBuffer(c, _PL_rd);
continue;
case 'x': /* \xNN\ */
addToBuffer(c, _PL_rd);
c = getchrq();
if (c == EOF)
goto eofinstr;
if (digitValue(16, c) >= 0) {
base = 16;
addToBuffer(c, _PL_rd);
xdigits:
c = getchrq();
while (digitValue(base, c) >= 0) {
addToBuffer(c, _PL_rd);
c = getchrq();
}
}
if (c == EOF)
goto eofinstr;
addToBuffer(c, _PL_rd);
if (c == q)
return TRUE;
continue;
default:
addToBuffer(c, _PL_rd);
if (digitValue(8, c) >= 0) /* \NNN\ */
{
base = 8;
goto xdigits;
} else if (c == '\n') /* \<newline> */
{
c = getchrq();
if (c == EOF)
goto eofinstr;
addToBuffer(c, _PL_rd);
if (c == q)
return TRUE;
}
continue; /* \symbolic-control-char */
}
} else if (c == '\n' && newlines++ > MAXNEWLINES &&
(_PL_rd->styleCheck & LONGATOM_CHECK)) {
rawSyntaxError("long_string");
}
2016-12-04 18:52:42 +00:00
addToBuffer(c, _PL_rd);
}
if (c == EOF) {
eofinstr:
rawSyntaxError("end_of_file_in_string");
}
addToBuffer(c, _PL_rd);
return TRUE;
}
2016-12-04 18:52:42 +00:00
static int add_comment(Buffer b, IOPOS *pos, ReadData _PL_rd ARG_LD) {
term_t head = PL_new_term_ref();
assert(_PL_rd->comments);
2016-12-04 18:52:42 +00:00
if (!PL_unify_list(_PL_rd->comments, head, _PL_rd->comments))
return FALSE;
2016-12-04 18:52:42 +00:00
if (pos) {
if (!PL_unify_term(head, PL_FUNCTOR, FUNCTOR_minus2, PL_FUNCTOR,
FUNCTOR_stream_position4, PL_INT64, pos->charno, PL_INT,
pos->lineno, PL_INT, pos->linepos, PL_INT, 0,
PL_UTF8_STRING, baseBuffer(b, char)))
return FALSE;
} else {
if (!PL_unify_term(head, PL_FUNCTOR, FUNCTOR_minus2, ATOM_minus,
PL_UTF8_STRING, baseBuffer(b, char)))
return FALSE;
}
PL_reset_term_refs(head);
return TRUE;
}
2016-12-04 18:52:42 +00:00
static void setErrorLocation(IOPOS *pos, ReadData _PL_rd) {
if (pos) {
GET_LD
2016-12-04 18:52:42 +00:00
source_char_no = pos->charno;
source_line_pos = pos->linepos;
source_line_no = pos->lineno;
}
rb.here = rb.base + 1; /* see rawSyntaxError() */
}
2016-12-04 18:52:42 +00:00
static unsigned char *raw_read2(ReadData _PL_rd ARG_LD) {
int c;
bool something_read = FALSE;
bool dotseen = FALSE;
2016-12-04 18:52:42 +00:00
IOPOS pbuf; /* comment start */
IOPOS *pos;
2016-12-04 18:52:42 +00:00
clearBuffer(_PL_rd); /* clear input buffer */
_PL_rd->strictness = truePrologFlag(PLFLAG_ISO);
source_line_no = -1;
2016-12-04 18:52:42 +00:00
for (;;) {
c = getchr();
handle_c:
switch (c) {
case EOF:
if (isStringStream(rb.stream)) /* do not require '. ' when */
{
addToBuffer(' ', _PL_rd); /* reading from a string */
addToBuffer('.', _PL_rd);
addToBuffer(' ', _PL_rd);
addToBuffer(EOS, _PL_rd);
return rb.base;
}
if (something_read) {
if (dotseen) /* term.<EOF> */
{
if (rb.here - rb.base == 1)
rawSyntaxError("end_of_clause");
ensure_space(' ');
addToBuffer(EOS, _PL_rd);
return rb.base;
}
rawSyntaxError("end_of_file");
}
if (Sfpasteof(rb.stream)) {
term_t stream;
LD->exception.processing = TRUE;
stream = PL_new_term_ref();
PL_unify_stream_or_alias(stream, rb.stream);
PL_error(NULL, 0, NULL, ERR_PERMISSION, ATOM_input,
ATOM_past_end_of_stream, stream);
return NULL;
}
set_start_line;
strcpy((char *)rb.base, "end_of_file. ");
rb.here = rb.base + 14;
return rb.base;
case '/':
if (rb.stream->position) {
pbuf = *rb.stream->position;
pbuf.charno--;
pbuf.linepos--;
pos = &pbuf;
} else
pos = NULL;
c = getchr();
if (c == '*') {
int last;
int level = 1;
union {
tmp_buffer ctmpbuf;
buffer tmpbuf;
} u;
Buffer cbuf;
if (_PL_rd->comments) {
initBuffer(&u.ctmpbuf);
cbuf = &u.tmpbuf;
addUTF8Buffer(cbuf, '/');
addUTF8Buffer(cbuf, '*');
} else {
cbuf = NULL;
}
if ((last = getchr()) == EOF) {
if (cbuf)
discardBuffer(cbuf);
setErrorLocation(pos, _PL_rd);
rawSyntaxError("end_of_file_in_block_comment");
}
if (cbuf)
addUTF8Buffer(cbuf, last);
if (something_read) {
addToBuffer(' ', _PL_rd); /* positions */
addToBuffer(' ', _PL_rd);
addToBuffer(last == '\n' ? last : ' ', _PL_rd);
}
for (;;) {
c = getchr();
if (cbuf)
addUTF8Buffer(cbuf, c);
switch (c) {
case EOF:
if (cbuf)
discardBuffer(cbuf);
setErrorLocation(pos, _PL_rd);
rawSyntaxError("end_of_file_in_block_comment");
#ifndef __YAP_PROLOG__
2016-12-04 18:52:42 +00:00
/* YAP does not support comment levels in original scanner */
case '*':
if (last == '/')
level++;
break;
#endif
2016-12-04 18:52:42 +00:00
case '/':
if (last == '*' && (--level == 0 || _PL_rd->strictness)) {
if (cbuf) {
addUTF8Buffer(cbuf, EOS);
if (!add_comment(cbuf, pos, _PL_rd PASS_LD)) {
discardBuffer(cbuf);
return FALSE;
}
discardBuffer(cbuf);
}
c = ' ';
goto handle_c;
}
break;
}
if (something_read)
addToBuffer(c == '\n' ? c : ' ', _PL_rd);
last = c;
}
} else {
set_start_line;
addToBuffer('/', _PL_rd);
if (isSymbolW(c)) {
while (c != EOF && isSymbolW(c) &&
!(c == '`' && _PL_rd->backquoted_string)) {
addToBuffer(c, _PL_rd);
c = getchr();
}
}
dotseen = FALSE;
goto handle_c;
}
case '%':
if (something_read)
addToBuffer(' ', _PL_rd);
if (_PL_rd->comments) {
union {
tmp_buffer ctmpbuf;
buffer uctmpbuf;
} u;
Buffer cbuf;
if (rb.stream->position) {
pbuf = *rb.stream->position;
pbuf.charno--;
pbuf.linepos--;
pos = &pbuf;
} else
pos = NULL;
initBuffer(&u.ctmpbuf);
cbuf = (Buffer)&u.uctmpbuf;
addUTF8Buffer(cbuf, '%');
for (;;) {
while ((c = getchr()) != EOF && c != '\n') {
addUTF8Buffer(cbuf, c);
if (something_read) /* record positions */
addToBuffer(' ', _PL_rd);
}
if (c == '\n') {
int c2 = Speekcode(rb.stream);
if (c2 == '%') {
if (something_read) {
addToBuffer(c, _PL_rd);
addToBuffer(' ', _PL_rd);
}
addUTF8Buffer(cbuf, c);
c = Sgetcode(rb.stream);
assert(c == c2);
addUTF8Buffer(cbuf, c);
continue;
}
}
break;
}
addUTF8Buffer(cbuf, EOS);
if (!add_comment(cbuf, pos, _PL_rd PASS_LD)) {
discardBuffer(cbuf);
return FALSE;
}
discardBuffer(cbuf);
} else {
while ((c = getchr()) != EOF && c != '\n') {
if (something_read) /* record positions */
addToBuffer(' ', _PL_rd);
}
}
goto handle_c; /* is the newline */
case '\'':
if (rb.here > rb.base && isDigit(rb.here[-1])) {
cucharp bs = &rb.here[-1];
if (bs > rb.base && isDigit(bs[-1]))
bs--;
if (bs > rb.base && isSign(bs[-1]))
bs--;
if (bs == rb.base || !PlIdContW(bs[-1])) {
int base;
if (isSign(bs[0]))
bs++;
base = atoi((char *)bs);
if (base <= 36) {
if (base == 0) /* 0'<c> */
{
addToBuffer(c, _PL_rd);
{
if ((c = getchr()) != EOF) {
addToBuffer(c, _PL_rd);
if (c == '\\') /* 0'\<c> */
{
if ((c = getchr()) != EOF)
addToBuffer(c, _PL_rd);
} else if (c == '\'') /* 0'' */
{
if ((c = getchr()) != EOF) {
if (c == '\'')
addToBuffer(c, _PL_rd);
else
goto handle_c;
}
}
break;
}
rawSyntaxError("end_of_file");
}
} else {
int c2 = Speekcode(rb.stream);
if (c2 != EOF) {
if (digitValue(base, c2) >= 0) {
addToBuffer(c, _PL_rd);
c = Sgetcode(rb.stream);
addToBuffer(c, _PL_rd);
dotseen = FALSE;
break;
}
goto sqatom;
}
rawSyntaxError("end_of_file");
}
}
}
}
sqatom:
set_start_line;
if (!raw_read_quoted(c, _PL_rd))
fail;
dotseen = FALSE;
break;
case '"':
set_start_line;
if (!raw_read_quoted(c, _PL_rd))
fail;
dotseen = FALSE;
break;
case '.':
addToBuffer(c, _PL_rd);
set_start_line;
dotseen++;
c = getchr();
if (isSymbolW(c)) {
while (c != EOF && isSymbolW(c) &&
!(c == '`' && _PL_rd->backquoted_string)) {
addToBuffer(c, _PL_rd);
c = getchr();
}
dotseen = FALSE;
}
goto handle_c;
case '`':
if (_PL_rd->backquoted_string) {
set_start_line;
if (!raw_read_quoted(c, _PL_rd))
fail;
dotseen = FALSE;
break;
}
/*FALLTHROUGH*/
default:
if (c < 0xff) {
switch (_PL_char_types[c]) {
case SP:
case CT:
blank:
if (dotseen) {
if (rb.here - rb.base == 1)
rawSyntaxError("end_of_clause");
ensure_space(c);
addToBuffer(EOS, _PL_rd);
return rb.base;
}
do {
if (something_read) /* positions, \0 --> ' ' */
addToBuffer(c ? c : ' ', _PL_rd);
else
ensure_space(c);
c = getchr();
} while (c != EOF && PlBlankW(c));
goto handle_c;
case SY:
set_start_line;
do {
addToBuffer(c, _PL_rd);
c = getchr();
if (c == '`' && _PL_rd->backquoted_string)
break;
} while (c != EOF && c <= 0xff && isSymbol(c));
/* TBD: wide symbols? */
dotseen = FALSE;
goto handle_c;
case LC:
case UC:
set_start_line;
do {
addToBuffer(c, _PL_rd);
c = getchr();
} while (c != EOF && PlIdContW(c));
dotseen = FALSE;
goto handle_c;
default:
addToBuffer(c, _PL_rd);
dotseen = FALSE;
set_start_line;
}
} else /* > 255 */
{
if (PlIdStartW(c)) {
set_start_line;
do {
addToBuffer(c, _PL_rd);
c = getchr();
} while (c != EOF && PlIdContW(c));
dotseen = FALSE;
goto handle_c;
} else if (PlBlankW(c)) {
goto blank;
} else {
addToBuffer(c, _PL_rd);
dotseen = FALSE;
set_start_line;
}
}
}
2016-12-04 18:52:42 +00:00
}
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Raw reading returns a string in UTF-8 notation of the a Prolog term.
Comment inside the term is replaced by spaces or newline to ensure
proper reconstruction of source locations. Comment before the term is
skipped.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
2016-12-04 18:52:42 +00:00
static unsigned char *raw_read(ReadData _PL_rd, unsigned char **endp ARG_LD) {
unsigned char *s;
2016-12-04 18:52:42 +00:00
if ((rb.stream->flags & SIO_ISATTY) && Sfileno(rb.stream) >= 0) {
ttybuf tab;
2016-12-04 18:52:42 +00:00
PushTty(rb.stream, &tab, TTY_SAVE); /* make sure tty is sane */
PopTty(rb.stream, &ttytab, FALSE);
s = raw_read2(_PL_rd PASS_LD);
PopTty(rb.stream, &tab, TRUE);
} else {
s = raw_read2(_PL_rd PASS_LD);
}
2016-12-04 18:52:42 +00:00
if (endp)
*endp = _PL_rd->_rb.here;
return s;
}
2016-12-04 18:52:42 +00:00
static void callCommentHook(term_t comments, term_t tpos, term_t term) {
GET_LD
fid_t fid;
term_t av;
2016-12-04 18:52:42 +00:00
if ((fid = PL_open_foreign_frame()) && (av = PL_new_term_refs(3))) {
qid_t qid;
2016-12-04 18:52:42 +00:00
PL_put_term(av + 0, comments);
PL_put_term(av + 1, tpos);
PL_put_term(av + 2, term);
2016-12-04 18:52:42 +00:00
if ((qid = PL_open_query(NULL, PL_Q_NODEBUG | PL_Q_CATCH_EXCEPTION,
(predicate_t)PredCommentHook, av))) {
term_t ex;
2016-12-04 18:52:42 +00:00
if (!PL_next_solution(qid) && (ex = PL_exception(qid)))
printMessage(ATOM_error, PL_TERM, ex);
2016-12-04 18:52:42 +00:00
PL_close_query(qid);
}
2016-12-04 18:52:42 +00:00
PL_discard_foreign_frame(fid);
}
}
/********************************
* PROLOG CONNECTION *
*********************************/
2016-12-04 18:52:42 +00:00
static unsigned char *backSkipUTF8(unsigned const char *start,
unsigned const char *end, int *chr) {
const unsigned char *s;
2016-12-04 18:52:42 +00:00
for (s = end - 1; s > start && (*s & 0x80); s--)
;
2016-12-04 18:52:42 +00:00
utf8_get_char((char *)s, chr);
return (unsigned char *)s;
}
2016-12-04 18:52:42 +00:00
static unsigned char *backSkipBlanks(const unsigned char *start,
const unsigned char *end) {
const unsigned char *s;
2016-12-04 18:52:42 +00:00
for (; end > start; end = s) {
unsigned char *e;
int chr;
2016-12-04 18:52:42 +00:00
for (s = end - 1; s > start && ISUTF8_CB(*s); s--)
;
e = (unsigned char *)utf8_get_char((char *)s, &chr);
assert(e == end);
if (!PlBlankW(chr))
return (unsigned char *)end;
}
return (unsigned char *)start;
}
2016-12-04 18:52:42 +00:00
static inline ucharp skipSpaces(cucharp in) {
int chr;
ucharp s;
2016-12-04 18:52:42 +00:00
for (; *in; in = s) {
s = utf8_get_uchar(in, &chr);
2016-12-04 18:52:42 +00:00
if (!PlBlankW(chr))
return (ucharp)in;
}
return (ucharp)in;
}
2016-12-04 18:52:42 +00:00
word pl_raw_read2(term_t from, term_t term) {
GET_LD
unsigned char *s, *e, *t2, *top;
read_data rd;
word rval;
IOSTREAM *in;
int chr;
PL_chars_t txt;
2016-12-04 18:52:42 +00:00
if (!getTextInputStream(from, &in))
fail;
init_read_data(&rd, in PASS_LD);
2016-12-04 18:52:42 +00:00
if (!(s = raw_read(&rd, &e PASS_LD))) {
rval = PL_raise_exception(rd.exception);
goto out;
}
/* strip the input from blanks */
2016-12-04 18:52:42 +00:00
top = backSkipBlanks(s, e - 1);
t2 = backSkipUTF8(s, top, &chr);
2016-12-04 18:52:42 +00:00
if (chr == '.')
top = backSkipBlanks(s, t2);
/* watch for "0' ." */
2016-12-04 18:52:42 +00:00
if (top < e && top - 2 >= s && top[-1] == '\'' && top[-2] == '0')
top++;
*top = EOS;
s = skipSpaces(s);
2016-12-04 18:52:42 +00:00
txt.text.t = (char *)s;
txt.length = top - s;
txt.storage = PL_CHARS_HEAP;
txt.encoding = ENC_UTF8;
txt.canonical = FALSE;
rval = PL_unify_text(term, 0, &txt, PL_ATOM);
LD->read_varnames = rd.varnames;
2016-12-04 18:52:42 +00:00
out:
free_read_data(&rd);
2016-12-04 18:52:42 +00:00
if (Sferror(in))
return streamStatus(in);
else
PL_release_stream(in);
return rval;
}
2016-12-04 18:52:42 +00:00
static int unify_read_term_position(term_t tpos ARG_LD) {
if (tpos && source_line_no > 0) {
return PL_unify_term(tpos, PL_FUNCTOR, FUNCTOR_stream_position4, PL_INT64,
source_char_no, PL_INT, source_line_no, PL_INT,
source_line_pos, PL_INT64, source_byte_no);
} else {
return TRUE;
}
}
2016-12-04 18:52:42 +00:00
static const opt_spec read_clause_options[] = {
{ATOM_variable_names, OPT_TERM},
{ATOM_term_position, OPT_TERM},
{ATOM_subterm_positions, OPT_TERM},
{ATOM_process_comment, OPT_BOOL},
{ATOM_comments, OPT_TERM},
{ATOM_syntax_errors, OPT_ATOM},
{NULL_ATOM, 0}};
/** read_clause(+Stream:stream, -Clause:clause, +Options:list)
Like read_term/3, but uses current compiler options.
Options:
* variable_names(-Names)
* process_comment(+Boolean)
* comments(-List)
* syntax_errors(+Atom)
* term_position(-Position)
* subterm_positions(-Layout)
*/
2016-12-04 18:52:42 +00:00
static int read_clause(IOSTREAM *s, term_t term, term_t options ARG_LD) {
read_data rd;
int rval;
fid_t fid;
term_t tpos = 0;
term_t comments = 0;
term_t opt_comments = 0;
int process_comment;
atom_t syntax_errors = ATOM_dec10;
{
OPCODE ophook = PredCommentHook->OpcodeOfPred;
if (ophook == UNDEF_OPCODE || ophook == FAIL_OPCODE)
process_comment = FALSE;
else
process_comment = TRUE;
}
2016-12-04 18:52:42 +00:00
if (!(fid = PL_open_foreign_frame()))
return FALSE;
2016-12-04 18:52:42 +00:00
retry:
init_read_data(&rd, s PASS_LD);
2016-12-04 18:52:42 +00:00
if (options &&
!scan_options(options, 0, ATOM_read_option, read_clause_options,
&rd.varnames, &tpos, &rd.subtpos, &process_comment,
&opt_comments, &syntax_errors)) {
PL_close_foreign_frame(fid);
return FALSE;
}
2016-12-04 18:52:42 +00:00
if (opt_comments) {
comments = PL_new_term_ref();
} else if (process_comment) {
if (!tpos)
tpos = PL_new_term_ref();
comments = PL_new_term_ref();
}
REGS_FROM_LD
2016-12-04 18:52:42 +00:00
rd.module = Yap_GetModuleEntry(LOCAL_SourceModule);
if (comments)
rd.comments = PL_copy_term_ref(comments);
rd.on_error = syntax_errors;
rd.singles = rd.styleCheck & SINGLETON_CHECK ? 1 : 0;
2016-12-04 18:52:42 +00:00
if ((rval = read_term(term, &rd PASS_LD)) &&
(!tpos || (rval = unify_read_term_position(tpos PASS_LD)))) {
PredEntry *ap;
LD->read_varnames = rd.varnames;
if (rd.singles) {
// warning, singletons([X=_A],f(X,Y,Z), pos).
printMessage(ATOM_warning, PL_FUNCTOR_CHARS, "singletons", 3, PL_TERM,
rd.singles, PL_TERM, term, PL_TERM, tpos);
}
ap = Yap_PredFromClause(Yap_GetFromSlot(term) PASS_REGS);
if (rd.styleCheck & (DISCONTIGUOUS_STYLE | MULTIPLE_CHECK) && ap != NULL) {
if (rd.styleCheck & (DISCONTIGUOUS_STYLE) &&
Yap_discontiguous(ap PASS_REGS)) {
printMessage(ATOM_warning, PL_FUNCTOR_CHARS, "discontiguous", 2,
PL_TERM, term, PL_TERM, tpos);
}
2016-12-04 18:52:42 +00:00
if (rd.styleCheck & (MULTIPLE_CHECK) && Yap_multiple(ap PASS_REGS)) {
printMessage(ATOM_warning, PL_FUNCTOR_CHARS, "multiple", 3, PL_TERM,
term, PL_TERM, tpos, PL_ATOM,
YAP_SWIAtomFromAtom(ap->src.OwnerFile));
}
}
2016-12-04 18:52:42 +00:00
if (rd.comments && (rval = PL_unify_nil(rd.comments))) {
if (opt_comments)
rval = PL_unify(opt_comments, comments);
else if (!PL_get_nil(comments))
callCommentHook(comments, tpos, term);
}
} else {
if (rd.has_exception && reportReadError(&rd)) {
PL_rewind_foreign_frame(fid);
free_read_data(&rd);
goto retry;
}
}
free_read_data(&rd);
return rval;
}
2016-12-04 18:52:42 +00:00
static PRED_IMPL("read_clause", 3, read_clause, 0) {
PRED_LD
int rc;
IOSTREAM *s;
2016-12-04 18:52:42 +00:00
if (!getTextInputStream(A1, &s))
return FALSE;
rc = read_clause(s, A2, A3 PASS_LD);
2016-12-04 18:52:42 +00:00
if (Sferror(s))
return streamStatus(s);
else
PL_release_stream(s);
return rc;
}
2016-12-04 18:52:42 +00:00
word pl_raw_read(term_t term) { return pl_raw_read2(0, term); }
2016-12-04 18:52:42 +00:00
static const opt_spec read_term_options[] = {
{ATOM_variable_names, OPT_TERM},
{ATOM_variables, OPT_TERM},
{ATOM_singletons, OPT_TERM},
{ATOM_term_position, OPT_TERM},
// { ATOM_subterm_positions, OPT_TERM },
2016-12-04 18:52:42 +00:00
{ATOM_character_escapes, OPT_BOOL},
{ATOM_double_quotes, OPT_ATOM},
{ATOM_module, OPT_ATOM},
{ATOM_syntax_errors, OPT_ATOM},
{ATOM_backquoted_string, OPT_BOOL},
{ATOM_comments, OPT_TERM},
{ATOM_process_comment, OPT_BOOL},
#ifdef O_QUASIQUOTATIONS
2016-12-04 18:52:42 +00:00
{ATOM_quasi_quotations, OPT_TERM},
#endif
2016-12-04 18:52:42 +00:00
{ATOM_cycles, OPT_BOOL},
{NULL_ATOM, 0}};
2016-12-04 18:52:42 +00:00
static foreign_t read_term_from_stream(IOSTREAM *s, term_t term,
term_t options ARG_LD) {
term_t tpos = 0;
term_t comments = 0;
term_t opt_comments = 0;
int process_comment;
int rval;
atom_t w;
read_data rd;
int charescapes = -1;
atom_t dq = NULL_ATOM;
atom_t mname = NULL_ATOM;
fid_t fid = PL_open_foreign_frame();
if (!fid)
return FALSE;
2016-12-04 18:52:42 +00:00
retry:
init_read_data(&rd, s PASS_LD);
2016-12-04 18:52:42 +00:00
if (!scan_options(options, 0, ATOM_read_option, read_term_options,
&rd.varnames, &rd.variables, &rd.singles, &tpos,
// &rd.subtpos,
&charescapes, &dq, &mname, &rd.on_error,
&rd.backquoted_string, &opt_comments, &process_comment,
#ifdef O_QUASIQUOTATIONS
2016-12-04 18:52:42 +00:00
&rd.quasi_quotations,
#endif
2016-12-04 18:52:42 +00:00
&rd.cycles)) {
PL_discard_foreign_frame(fid);
free_read_data(&rd);
return FALSE;
}
// yap specific, do not call process comment if undefined
if (process_comment) {
OPCODE ophook = PredCommentHook->OpcodeOfPred;
if (ophook == UNDEF_OPCODE || ophook == FAIL_OPCODE)
process_comment = FALSE;
}
2016-12-04 18:52:42 +00:00
if (opt_comments) {
comments = PL_new_term_ref();
} else if (process_comment) {
if (!tpos)
tpos = PL_new_term_ref();
comments = PL_new_term_ref();
}
2016-12-04 18:52:42 +00:00
if (mname) {
rd.module = lookupModule(mname);
rd.flags = rd.module->flags;
}
2016-12-04 18:52:42 +00:00
if (charescapes != -1) {
if (charescapes)
set(&rd, M_CHARESCAPE);
else
clear(&rd, M_CHARESCAPE);
}
if (dq) {
if (!setDoubleQuotes(dq, &rd.flags))
return FALSE;
}
if (rd.singles && PL_get_atom(rd.singles, &w) && w == ATOM_warning)
rd.singles = 1;
2016-12-04 18:52:42 +00:00
if (comments)
rd.comments = PL_copy_term_ref(comments);
rval = read_term(term, &rd PASS_LD);
2016-12-04 18:52:42 +00:00
if (Sferror(s)) {
free_read_data(&rd);
return FALSE;
}
LD->read_varnames = rd.varnames;
#ifdef O_QUASIQUOTATIONS
2016-12-04 18:52:42 +00:00
if (rval)
rval = parse_quasi_quotations(&rd PASS_LD);
#endif
2016-12-04 18:52:42 +00:00
if (rval) {
if (tpos)
rval = unify_read_term_position(tpos PASS_LD);
if (rval) {
if (opt_comments)
rval = PL_unify(opt_comments, comments);
else if (comments && !PL_get_nil(comments))
callCommentHook(comments, tpos, term);
}
} else {
if (rd.has_exception && reportReadError(&rd)) {
PL_rewind_foreign_frame(fid);
free_read_data(&rd);
goto retry;
}
}
free_read_data(&rd);
return rval;
}
/** @pred read_term(+ _Stream_,- _T_,+ _Options_) is iso
Reads term _T_ from stream _Stream_ with execution controlled by the
same options as read_term/2.
*/
2016-12-04 18:52:42 +00:00
static PRED_IMPL("read_term", 3, read_term, PL_FA_ISO) {
PRED_LD
IOSTREAM *s;
2016-12-04 18:52:42 +00:00
if (getTextInputStream(A1, &s)) {
if (read_term_from_stream(s, A2, A3 PASS_LD))
return PL_release_stream(s);
if (Sferror(s))
return streamStatus(s);
PL_release_stream(s);
return FALSE;
}
return FALSE;
}
/** read_term(-Term, +Options) is det.
*/
/** @pred read_term(- _T_,+ _Options_) is iso
Reads term _T_ from the current input stream with execution
controlled by the following options:
+ comments(- _Comments_)
Unify _Comments_ with a list of string terms including comments before
and within the term.
+ module( + _Module_)
Read term using _Module_ as source module.
+ quasi_quotations(-List)
Unify _List_ with the quasi-quotations present in the term.
+ term_position(- _Position_)
Unify _Position_ with a term describing the position of the stream
at the start of parse. Use stream_position_data/3 to obtain extra
information.
+ singletons(- _Names_)
Unify _Names_ with a list of the form _Name=Var_, where
_Name_ is the name of a non-anonymous singleton variable in the
original term, and `Var` is the variable's representation in
YAP.
The variables occur in left-to-right traversal order.
+ syntax_errors(+ _Val_)
Control action to be taken after syntax errors. See yap_flag/2
for detailed information.
+ variables(- _Names_)
Unify _Names_ with a list of the form _Name=Var_, where _Name_ is
the name of a non-anonymous variable in the original term, and _Var_
is the variable's representation in YAP.
The variables occur in left-to-right traversal order.
*/
2016-12-04 18:52:42 +00:00
static PRED_IMPL("read_term", 2, read_term, PL_FA_ISO) {
PRED_LD
IOSTREAM *s;
2016-12-04 18:52:42 +00:00
if (getTextInputStream(0, &s)) {
if (read_term_from_stream(s, A1, A2 PASS_LD))
return PL_release_stream(s);
if (Sferror(s))
return streamStatus(s);
PL_release_stream(s);
return FALSE;
}
return FALSE;
}
/*******************************
* TERM <->ATOM *
*******************************/
2016-12-04 18:52:42 +00:00
static int atom_to_term(term_t atom, term_t term, term_t bindings) {
GET_LD
PL_chars_t txt;
if (!bindings && PL_is_variable(atom)) /* term_to_atom(+, -) */
{
char buf[1024];
size_t bufsize = sizeof(buf);
int rval;
char *s = buf;
IOSTREAM *stream;
PL_chars_t txt;
2016-12-04 18:52:42 +00:00
stream = Sopenmem(&s, &bufsize, "w");
stream->encoding = ENC_UTF8;
PL_write_term(stream, term, 1200, PL_WRT_QUOTED);
Sflush(stream);
2016-12-04 18:52:42 +00:00
txt.text.t = s;
txt.length = bufsize;
txt.storage = PL_CHARS_HEAP;
txt.encoding = ENC_UTF8;
txt.canonical = FALSE;
rval = PL_unify_text(atom, 0, &txt, PL_ATOM);
2016-12-04 18:52:42 +00:00
Sclose(stream);
if (s != buf)
Sfree(s);
2016-12-04 18:52:42 +00:00
return rval;
}
2016-12-04 18:52:42 +00:00
if (PL_get_text(atom, &txt, CVT_ALL | CVT_EXCEPTION)) {
GET_LD
read_data rd;
int rval;
IOSTREAM *stream;
source_location oldsrc = LD->read_source;
2016-12-04 18:52:42 +00:00
stream = Sopen_text(&txt, "r");
init_read_data(&rd, stream PASS_LD);
if (bindings && (PL_is_variable(bindings) || PL_is_list(bindings)))
rd.varnames = bindings;
else if (bindings)
return PL_error(NULL, 0, NULL, ERR_TYPE, ATOM_list, bindings);
if (!(rval = read_term(term, &rd PASS_LD)) && rd.has_exception)
rval = PL_raise_exception(rd.exception);
free_read_data(&rd);
Sclose(stream);
LD->read_source = oldsrc;
// getchar();
return rval;
}
fail;
}
2016-12-04 18:52:42 +00:00
Term Yap_CharsToTerm(const char *s, size_t *lenp, Term *bindingsp) {
GET_LD;
read_data rd;
int rval;
IOSTREAM *stream;
source_location oldsrc = LD->read_source;
2016-12-04 18:52:42 +00:00
stream = Sopen_string(0, (char *)s, strlen(s), "r");
init_read_data(&rd, stream PASS_LD);
rd.varnames = bindings;
term_t tt = Yap_NewSlots(1);
2016-12-04 18:52:42 +00:00
if (!(rval = read_term(tt, &rd PASS_LD)) && rd.has_exception) {
rval = PL_raise_exception(rd.exception);
return 0L;
}
free_read_data(&rd);
Sclose(stream);
LD->read_source = oldsrc;
// getchar();
2016-12-04 18:52:42 +00:00
return Yap_GetFromSlot(tt);
}
/** @pred atom_to_term(+ _Atom_, - _Term_, - _Bindings_)
2016-12-04 18:52:42 +00:00
Use _Atom_ as input to read_term/2 using the option `variable_names` and
return the read term in _Term_ and the variable bindings in _Bindings_.
_Bindings_ is a list of `Name = Var` couples, thus providing access to the
actual variable names. See also read_term/2. If Atom has no valid syntax, a
syntax_error exception is raised.
*/
2016-12-04 18:52:42 +00:00
static PRED_IMPL("atom_to_term", 3, atom_to_term, 0) {
return atom_to_term(A1, A2, A3);
}
2016-12-04 18:52:42 +00:00
static PRED_IMPL("term_to_atom", 2, term_to_atom, 0) {
return atom_to_term(A2, A1, 0);
}
2016-12-04 18:52:42 +00:00
static PRED_IMPL("$context_variables", 1, context_variables, 0) {
CACHE_REGS
if (LOCAL_VarNames == (CELL)0)
return Yap_unify(TermNil, ARG1);
return Yap_unify(LOCAL_VarNames, ARG1);
}
2016-12-04 18:52:42 +00:00
static PRED_IMPL("$set_source", 2, set_source, 0) {
GET_LD
2016-12-04 18:52:42 +00:00
atom_t at;
term_t a = PL_new_term_ref();
if (!PL_get_atom(A1, &at))
return FALSE;
source_file_name = at;
if (!PL_get_arg(1, A2, a) || !PL_get_int64(a, &source_char_no) ||
!PL_get_arg(2, A2, a) || !PL_get_long(a, &source_line_no) ||
!PL_get_arg(3, A2, a) || !PL_get_long(a, &source_line_pos) ||
2016-12-04 18:52:42 +00:00
!PL_get_arg(4, A2, a) || !PL_get_int64(a, &source_byte_no)) {
return FALSE;
}
return TRUE;
}
2016-12-04 18:52:42 +00:00
int PL_chars_to_term(const char *s, term_t t) {
GET_LD
read_data rd;
int rval;
IOSTREAM *stream = Sopen_string(NULL, (char *)s, -1, "r");
source_location oldsrc = LD->read_source;
init_read_data(&rd, stream PASS_LD);
PL_put_variable(t);
2016-12-04 18:52:42 +00:00
if (!(rval = read_term(t, &rd PASS_LD)) && rd.has_exception)
PL_put_term(t, rd.exception);
LOCAL_VarNames = rd.varnames;
free_read_data(&rd);
Sclose(stream);
LD->read_source = oldsrc;
return rval;
}
/*******************************
* PUBLISH PREDICATES *
*******************************/
2016-12-04 18:52:42 +00:00
BeginPredDefs(read) PRED_DEF("read_term", 3, read_term, PL_FA_ISO)
PRED_DEF("read_term", 2, read_term, PL_FA_ISO)
PRED_DEF("read_clause", 3, read_clause, 0)
PRED_DEF("atom_to_term", 3, atom_to_term, 0)
PRED_DEF("term_to_atom", 2, term_to_atom, 0)
PRED_DEF("$context_variables", 1, context_variables, 0)
PRED_DEF("$set_source", 2, set_source, 0)
#ifdef O_QUASIQUOTATIONS
2016-12-04 18:52:42 +00:00
PRED_DEF("$qq_open", 2, qq_open, 0)
#endif
2016-12-04 18:52:42 +00:00
EndPredDefs
2016-12-04 18:52:42 +00:00
//! @}