1610 lines
33 KiB
C
1610 lines
33 KiB
C
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#include "pl-incl.h"
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#include "pl-ctype.h"
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#include "pl-utf8.h"
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#include "pl-dtoa.h"
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#include "pl-umap.c" /* Unicode map */
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#include "pl-read.h" /* read structure */
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/**
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* @defgroup ReadTerm Read Term from Streams
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* @ingroup InputOutput
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* @{
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*/
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static bool
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isStringStream(IOSTREAM *s)
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{ return s->functions == &Sstringfunctions;
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}
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void
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init_read_data(ReadData _PL_rd, IOSTREAM *in ARG_LD)
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{ CACHE_REGS
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memset(_PL_rd, 0, sizeof(*_PL_rd)); /* optimise! */
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_PL_rd->magic = RD_MAGIC;
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_PL_rd->varnames = 0;
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_PL_rd->module = Yap_GetModuleEntry(CurrentModule);
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_PL_rd->exception = PL_new_term_ref();
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rb.stream = in;
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_PL_rd->has_exception = 0;
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_PL_rd->module = MODULE_parse;
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_PL_rd->flags = _PL_rd->module->flags; /* change for options! */
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_PL_rd->styleCheck = debugstatus.styleCheck;
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_PL_rd->on_error = ATOM_error;
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_PL_rd->backquoted_string = truePrologFlag(PLFLAG_BACKQUOTED_STRING);
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}
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void
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free_read_data(ReadData _PL_rd)
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{
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}
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static int
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read_term(term_t t, ReadData _PL_rd ARG_LD)
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{
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return Yap_read_term(t, rb.stream, _PL_rd);
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}
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static void addUTF8Buffer(Buffer b, int c);
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static void
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addUTF8Buffer(Buffer b, int c)
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{ if ( c >= 0x80 )
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{ char buf[6];
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char *p, *end;
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end = utf8_put_char(buf, c);
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for(p=buf; p<end; p++)
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{ addBuffer(b, *p&0xff, char);
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}
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} else
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{ addBuffer(b, c, char);
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}
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}
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/*******************************
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* UNICODE CLASSIFIERS *
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*******************************/
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#define CharTypeW(c, t, w) \
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((unsigned)(c) <= 0xff ? (_PL_char_types[(unsigned)(c)] t) \
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: (uflagsW(c) & (w)))
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#define PlBlankW(c) CharTypeW(c, == SP, U_SEPARATOR)
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#define PlUpperW(c) CharTypeW(c, == UC, U_UPPERCASE)
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#define PlIdStartW(c) (c <= 0xff ? (isLower(c)||isUpper(c)||c=='_') \
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: uflagsW(c) & U_ID_START)
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#define PlIdContW(c) CharTypeW(c, >= UC, U_ID_CONTINUE)
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#define PlSymbolW(c) CharTypeW(c, == SY, U_SYMBOL)
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#define PlPunctW(c) CharTypeW(c, == PU, 0)
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#define PlSoloW(c) CharTypeW(c, == SO, U_OTHER)
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#define PlInvalidW(c) (uflagsW(c) == 0)
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int
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f_is_prolog_var_start(wint_t c)
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{ return PlIdStartW(c) && (PlUpperW(c) || c == '_');
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}
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int
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f_is_prolog_atom_start(wint_t c)
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{ return PlIdStartW(c) != 0;
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}
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int
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f_is_prolog_identifier_continue(wint_t c)
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{ return PlIdContW(c) || c == '_';
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}
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int
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f_is_prolog_symbol(wint_t c)
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{ return PlSymbolW(c) != 0;
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}
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int
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unicode_separator(pl_wchar_t c)
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{ return PlBlankW(c);
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}
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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FALSE return false
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TRUE redo
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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static int
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reportReadError(ReadData rd)
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{ if ( rd->on_error == ATOM_error )
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return PL_raise_exception(rd->exception);
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if ( rd->on_error != ATOM_quiet )
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printMessage(ATOM_error, PL_TERM, rd->exception);
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PL_clear_exception();
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if ( rd->on_error == ATOM_dec10 )
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return TRUE;
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return FALSE;
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}
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/* static int */
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/* reportSingletons(ReadData rd, singletons, Atom amod, Atom aname, UInt arity) */
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/* { */
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/* printMessage(ATOM_warning, PL_FUNCTOR_CHARS, */
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/* "singletons", 2, */
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/* PL_TERM, singletons, */
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/* PL_TERM, mod, */
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/* PL_FUNCTOR_divide2, */
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/* PL_ATOM, name, */
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/* PL_INT, arity); */
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/* return FALSE; */
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/* } */
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/********************************
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* RAW READING *
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*********************************/
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Scan the input, give prompts when necessary and return a char * holding
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a stripped version of the next term. Contiguous white space is mapped
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on a single space, block and % ... \n comment is deleted. Memory is
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claimed automatically en enlarged if necessary.
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(char *) NULL is returned on a syntax error.
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#define syntaxError(what, rd) { errorWarning(what, 0, rd); fail; }
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static term_t
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makeErrorTerm(const char *id_str, term_t id_term, ReadData _PL_rd)
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{ GET_LD
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term_t ex, loc=0; /* keep compiler happy */
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unsigned char const *s, *ll = NULL;
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int rc = TRUE;
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if ( !(ex = PL_new_term_ref()) ||
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!(loc = PL_new_term_ref()) )
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rc = FALSE;
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if ( rc && !id_term )
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{ if ( !(id_term=PL_new_term_ref()) ||
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!PL_put_atom_chars(id_term, id_str) )
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rc = FALSE;
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}
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if ( rc )
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rc = PL_unify_term(ex,
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PL_FUNCTOR, FUNCTOR_error2,
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PL_FUNCTOR, FUNCTOR_syntax_error1,
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PL_TERM, id_term,
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PL_TERM, loc);
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source_char_no += last_token_start - rdbase;
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for(s=rdbase; s<last_token_start; s++)
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{ if ( *s == '\n' )
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{ source_line_no++;
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ll = s+1;
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}
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}
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if ( ll )
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{ int lp = 0;
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for(s = ll; s<last_token_start; s++)
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{ switch(*s)
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{ case '\b':
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if ( lp > 0 ) lp--;
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break;
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case '\t':
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lp |= 7;
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default:
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lp++;
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}
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}
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source_line_pos = lp;
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}
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if ( rc )
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{ if ( ReadingSource ) /* reading a file */
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{ rc = PL_unify_term(loc,
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PL_FUNCTOR, FUNCTOR_file4,
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PL_ATOM, source_file_name,
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PL_INT, source_line_no,
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PL_INT, source_line_pos,
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PL_INT64, source_char_no);
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} else if ( isStringStream(rb.stream) )
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{ size_t pos;
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pos = utf8_strlen((char *)rdbase, last_token_start-rdbase);
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rc = PL_unify_term(loc,
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PL_FUNCTOR, FUNCTOR_string2,
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PL_UTF8_STRING, rdbase,
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PL_INT, (int)pos);
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} else /* any stream */
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{ term_t stream;
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if ( !(stream=PL_new_term_ref()) ||
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!PL_unify_stream_or_alias(stream, rb.stream) ||
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!PL_unify_term(loc,
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PL_FUNCTOR, FUNCTOR_stream4,
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PL_TERM, stream,
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PL_INT, source_line_no,
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PL_INT, source_line_pos,
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PL_INT64, source_char_no) )
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rc = FALSE;
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}
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}
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return (rc ? ex : (term_t)0);
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}
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static bool
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errorWarning(const char *id_str, term_t id_term, ReadData _PL_rd)
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{ GET_LD
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term_t ex;
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LD->exception.processing = TRUE; /* allow using spare stack */
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ex = makeErrorTerm(id_str, id_term, _PL_rd);
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if ( _PL_rd )
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{ _PL_rd->has_exception = TRUE;
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if ( ex )
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PL_put_term(_PL_rd->exception, ex);
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else
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PL_put_term(_PL_rd->exception, exception_term);
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} else
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{ if ( ex )
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PL_raise_exception(ex);
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}
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fail;
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}
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static void
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clearBuffer(ReadData _PL_rd)
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{ if (rb.size == 0)
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{ rb.base = rb.fast;
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rb.size = sizeof(rb.fast);
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}
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rb.end = rb.base + rb.size;
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rdbase = rb.here = rb.base;
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_PL_rd->posp = rdbase;
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_PL_rd->posi = 0;
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}
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static void
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growToBuffer(int c, ReadData _PL_rd)
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{ if ( rb.base == rb.fast ) /* intptr_t clause: jump to use malloc() */
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{ rb.base = PL_malloc(FASTBUFFERSIZE * 2);
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memcpy(rb.base, rb.fast, FASTBUFFERSIZE);
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} else
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rb.base = PL_realloc(rb.base, rb.size*2);
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DEBUG(8, Sdprintf("Reallocated read buffer at %ld\n", (intptr_t) rb.base));
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_PL_rd->posp = rdbase = rb.base;
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rb.here = rb.base + rb.size;
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rb.size *= 2;
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rb.end = rb.base + rb.size;
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_PL_rd->posi = 0;
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*rb.here++ = c;
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}
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static inline void
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addByteToBuffer(int c, ReadData _PL_rd)
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{ c &= 0xff;
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if ( rb.here >= rb.end )
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growToBuffer(c, _PL_rd);
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else
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*rb.here++ = c;
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}
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static void
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addToBuffer(int c, ReadData _PL_rd)
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{ if ( c <= 0x7f )
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{ addByteToBuffer(c, _PL_rd);
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} else
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{ char buf[10];
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char *s, *e;
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e = utf8_put_char(buf, c);
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for(s=buf; s<e; s++)
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addByteToBuffer(*s, _PL_rd);
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}
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}
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#if __YAP_PROLOG__
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void
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Yap_setCurrentSourceLocation( void *rd )
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{
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GET_LD
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setCurrentSourceLocation(rd PASS_LD);
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}
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#endif
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static inline int
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getchr__(ReadData _PL_rd)
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{ int c = Sgetcode(rb.stream);
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if ( !_PL_rd->char_conversion_table || c < 0 || c >= 256 )
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return c;
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return _PL_rd->char_conversion_table[c];
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}
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#define getchr() getchr__(_PL_rd)
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#define getchrq() Sgetcode(rb.stream)
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#define ensure_space(c) { if ( something_read && \
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(c == '\n' || !isBlank(rb.here[-1])) ) \
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addToBuffer(c, _PL_rd); \
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}
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#define set_start_line { if ( !something_read ) \
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{ setCurrentSourceLocation(_PL_rd PASS_LD); \
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something_read++; \
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} \
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}
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#ifdef O_QUASIQUOTATIONS
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/** '$qq_open'(+QQRange, -Stream) is det.
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Opens a quasi-quoted memory range.
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@arg QQRange is a term '$quasi_quotation'(ReadData, Start, Length)
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@arg Stream is a UTF-8 encoded string, whose position indication
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reflects the location in the real file.
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*/
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static
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PRED_IMPL("$qq_open", 2, qq_open, 0)
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{ PRED_LD
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if ( PL_is_functor(A1, FUNCTOR_dquasi_quotation3) )
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{ void *ptr;
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char * start;
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size_t len;
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term_t arg = PL_new_term_ref();
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IOSTREAM *s;
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if ( PL_get_arg(1, A1, arg) && PL_get_pointer_ex(arg, &ptr) &&
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PL_get_arg(2, A1, arg) && PL_get_intptr(arg, (intptr_t *)&start) &&
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PL_get_arg(3, A1, arg) && PL_get_intptr(arg, (intptr_t *)&len) )
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{ //source_location pos;
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if ( (s=Sopenmem(&start, &len, "r")) )
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s->encoding = ENC_UTF8;
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return PL_unify_stream(A2, s);
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}
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} else
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PL_type_error("read_context", A1);
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return FALSE;
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}
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static int
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parse_quasi_quotations(ReadData _PL_rd ARG_LD)
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{ if ( _PL_rd->qq_tail )
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{ term_t av;
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int rc;
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if ( !PL_unify_nil(_PL_rd->qq_tail) )
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return FALSE;
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if ( !_PL_rd->quasi_quotations )
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{ if ( (av = PL_new_term_refs(2)) &&
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PL_put_term(av+0, _PL_rd->qq) &&
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#if __YAP_PROLOG__
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PL_put_atom(av+1, YAP_SWIAtomFromAtom(_PL_rd->module->AtomOfME)) &&
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#else
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PL_put_atom(av+1, _PL_rd->module->name) &&
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#endif
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PL_cons_functor_v(av, FUNCTOR_dparse_quasi_quotations2, av) )
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{ term_t ex;
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rc = callProlog(MODULE_system, av+0, PL_Q_CATCH_EXCEPTION, &ex);
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if ( rc )
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return TRUE;
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_PL_rd->exception = ex;
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_PL_rd->has_exception = TRUE;
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}
|
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return FALSE;
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} else
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return TRUE;
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} else if ( _PL_rd->quasi_quotations ) /* user option, but no quotes */
|
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{ return PL_unify_nil(_PL_rd->quasi_quotations);
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} else
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return TRUE;
|
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}
|
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|
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|
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#endif /*O_QUASIQUOTATIONS*/
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|
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|
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#define rawSyntaxError(what) { addToBuffer(EOS, _PL_rd); \
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rdbase = rb.base, last_token_start = rb.here-1; \
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syntaxError(what, _PL_rd); \
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}
|
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|
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static int
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raw_read_quoted(int q, ReadData _PL_rd)
|
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{ int newlines = 0;
|
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int c;
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|
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addToBuffer(q, _PL_rd);
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while((c=getchrq()) != EOF && c != q)
|
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{ if ( c == '\\' && DO_CHARESCAPE )
|
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{ int base;
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addToBuffer(c, _PL_rd);
|
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|
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switch( (c=getchrq()) )
|
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{ case EOF:
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goto eofinstr;
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case 'u': /* \uXXXX */
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case 'U': /* \UXXXXXXXX */
|
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addToBuffer(c, _PL_rd);
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continue;
|
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case 'x': /* \xNN\ */
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addToBuffer(c, _PL_rd);
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c = getchrq();
|
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if ( c == EOF )
|
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goto eofinstr;
|
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if ( digitValue(16, c) >= 0 )
|
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{ base = 16;
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addToBuffer(c, _PL_rd);
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|
|
xdigits:
|
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c = getchrq();
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while( digitValue(base, c) >= 0 )
|
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{ addToBuffer(c, _PL_rd);
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c = getchrq();
|
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}
|
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}
|
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if ( c == EOF )
|
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goto eofinstr;
|
|
addToBuffer(c, _PL_rd);
|
|
if ( c == q )
|
|
return TRUE;
|
|
continue;
|
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default:
|
|
addToBuffer(c, _PL_rd);
|
|
if ( digitValue(8, c) >= 0 ) /* \NNN\ */
|
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{ base = 8;
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goto xdigits;
|
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} else if ( c == '\n' ) /* \<newline> */
|
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{ c = getchrq();
|
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if ( c == EOF )
|
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goto eofinstr;
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addToBuffer(c, _PL_rd);
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if ( c == q )
|
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return TRUE;
|
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}
|
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continue; /* \symbolic-control-char */
|
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}
|
|
} else if (c == '\n' &&
|
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newlines++ > MAXNEWLINES &&
|
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(_PL_rd->styleCheck & LONGATOM_CHECK))
|
|
{ rawSyntaxError("long_string");
|
|
}
|
|
addToBuffer(c, _PL_rd);
|
|
}
|
|
if (c == EOF)
|
|
{ eofinstr:
|
|
rawSyntaxError("end_of_file_in_string");
|
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}
|
|
addToBuffer(c, _PL_rd);
|
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|
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return TRUE;
|
|
}
|
|
|
|
|
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static int
|
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add_comment(Buffer b, IOPOS *pos, ReadData _PL_rd ARG_LD)
|
|
{ term_t head = PL_new_term_ref();
|
|
|
|
assert(_PL_rd->comments);
|
|
if ( !PL_unify_list(_PL_rd->comments, head, _PL_rd->comments) )
|
|
return FALSE;
|
|
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;
|
|
}
|
|
|
|
|
|
static void
|
|
setErrorLocation(IOPOS *pos, ReadData _PL_rd)
|
|
{ if ( pos )
|
|
{ GET_LD
|
|
|
|
source_char_no = pos->charno;
|
|
source_line_pos = pos->linepos;
|
|
source_line_no = pos->lineno;
|
|
}
|
|
rb.here = rb.base+1; /* see rawSyntaxError() */
|
|
}
|
|
|
|
|
|
static unsigned char *
|
|
raw_read2(ReadData _PL_rd ARG_LD)
|
|
{ int c;
|
|
bool something_read = FALSE;
|
|
bool dotseen = FALSE;
|
|
IOPOS pbuf; /* comment start */
|
|
IOPOS *pos;
|
|
|
|
clearBuffer(_PL_rd); /* clear input buffer */
|
|
_PL_rd->strictness = truePrologFlag(PLFLAG_ISO);
|
|
source_line_no = -1;
|
|
|
|
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__
|
|
/* YAP does not support comment levels in original scanner */
|
|
case '*':
|
|
if ( last == '/' )
|
|
level++;
|
|
break;
|
|
#endif
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
|
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.
|
|
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
|
|
|
|
static unsigned char *
|
|
raw_read(ReadData _PL_rd, unsigned char **endp ARG_LD)
|
|
{ unsigned char *s;
|
|
|
|
if ( (rb.stream->flags & SIO_ISATTY) && Sfileno(rb.stream) >= 0 )
|
|
{ ttybuf tab;
|
|
|
|
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);
|
|
}
|
|
|
|
if ( endp )
|
|
*endp = _PL_rd->_rb.here;
|
|
|
|
return s;
|
|
}
|
|
|
|
static void
|
|
callCommentHook(term_t comments, term_t tpos, term_t term)
|
|
{ GET_LD
|
|
fid_t fid;
|
|
term_t av;
|
|
|
|
if ( (fid = PL_open_foreign_frame()) &&
|
|
(av = PL_new_term_refs(3)) )
|
|
{ qid_t qid;
|
|
|
|
PL_put_term(av+0, comments);
|
|
PL_put_term(av+1, tpos);
|
|
PL_put_term(av+2, term);
|
|
|
|
if ( (qid = PL_open_query(NULL, PL_Q_NODEBUG|PL_Q_CATCH_EXCEPTION,
|
|
(predicate_t)PredCommentHook, av)) )
|
|
{ term_t ex;
|
|
|
|
if ( !PL_next_solution(qid) && (ex=PL_exception(qid)) )
|
|
printMessage(ATOM_error, PL_TERM, ex);
|
|
|
|
PL_close_query(qid);
|
|
}
|
|
PL_discard_foreign_frame(fid);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/********************************
|
|
* PROLOG CONNECTION *
|
|
*********************************/
|
|
|
|
static unsigned char *
|
|
backSkipUTF8(unsigned const char *start, unsigned const char *end, int *chr)
|
|
{ const unsigned char *s;
|
|
|
|
for(s=end-1 ; s>start && ( *s&0x80 ); s--)
|
|
;
|
|
utf8_get_char((char*)s, chr);
|
|
|
|
return (unsigned char *)s;
|
|
}
|
|
|
|
|
|
static unsigned char *
|
|
backSkipBlanks(const unsigned char *start, const unsigned char *end)
|
|
{ const unsigned char *s;
|
|
|
|
for( ; end > start; end = s)
|
|
{ unsigned char *e;
|
|
int chr;
|
|
|
|
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;
|
|
}
|
|
|
|
static inline ucharp
|
|
skipSpaces(cucharp in)
|
|
{ int chr;
|
|
ucharp s;
|
|
|
|
for( ; *in; in=s)
|
|
{ s = utf8_get_uchar(in, &chr);
|
|
|
|
if ( !PlBlankW(chr) )
|
|
return (ucharp)in;
|
|
}
|
|
|
|
return (ucharp)in;
|
|
}
|
|
|
|
|
|
|
|
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;
|
|
|
|
if ( !getTextInputStream(from, &in) )
|
|
fail;
|
|
|
|
init_read_data(&rd, in PASS_LD);
|
|
if ( !(s = raw_read(&rd, &e PASS_LD)) )
|
|
{ rval = PL_raise_exception(rd.exception);
|
|
goto out;
|
|
}
|
|
|
|
/* strip the input from blanks */
|
|
top = backSkipBlanks(s, e-1);
|
|
t2 = backSkipUTF8(s, top, &chr);
|
|
if ( chr == '.' )
|
|
top = backSkipBlanks(s, t2);
|
|
/* watch for "0' ." */
|
|
if ( top < e && top-2 >= s && top[-1] == '\'' && top[-2] == '0' )
|
|
top++;
|
|
*top = EOS;
|
|
s = skipSpaces(s);
|
|
|
|
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);
|
|
|
|
out:
|
|
free_read_data(&rd);
|
|
if ( Sferror(in) )
|
|
return streamStatus(in);
|
|
else
|
|
PL_release_stream(in);
|
|
|
|
return rval;
|
|
}
|
|
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
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)
|
|
*/
|
|
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;
|
|
}
|
|
if ( !(fid=PL_open_foreign_frame()) )
|
|
return FALSE;
|
|
|
|
retry:
|
|
init_read_data(&rd, s PASS_LD);
|
|
|
|
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;
|
|
}
|
|
|
|
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
|
|
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;
|
|
if ( (rval=read_term(term, &rd PASS_LD)) &&
|
|
(!tpos || (rval=unify_read_term_position(tpos PASS_LD))) )
|
|
{
|
|
PredEntry *ap;
|
|
|
|
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) 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 );
|
|
}
|
|
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) );
|
|
}
|
|
}
|
|
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;
|
|
}
|
|
|
|
|
|
static
|
|
PRED_IMPL("read_clause", 3, read_clause, 0)
|
|
{ PRED_LD
|
|
int rc;
|
|
IOSTREAM *s;
|
|
|
|
if ( !getTextInputStream(A1, &s) )
|
|
return FALSE;
|
|
rc = read_clause(s, A2, A3 PASS_LD);
|
|
if ( Sferror(s) )
|
|
return streamStatus(s);
|
|
else
|
|
PL_release_stream(s);
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
word
|
|
pl_raw_read(term_t term)
|
|
{ return pl_raw_read2(0, term);
|
|
}
|
|
|
|
|
|
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 },
|
|
{ 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
|
|
{ ATOM_quasi_quotations, OPT_TERM },
|
|
#endif
|
|
{ ATOM_cycles, OPT_BOOL },
|
|
{ NULL_ATOM, 0 }
|
|
};
|
|
|
|
|
|
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;
|
|
retry:
|
|
init_read_data(&rd, s PASS_LD);
|
|
|
|
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
|
|
&rd.quasi_quotations,
|
|
#endif
|
|
&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;
|
|
}
|
|
|
|
if ( opt_comments )
|
|
{ comments = PL_new_term_ref();
|
|
} else if ( process_comment )
|
|
{ if ( !tpos )
|
|
tpos = PL_new_term_ref();
|
|
comments = PL_new_term_ref();
|
|
}
|
|
|
|
if ( mname )
|
|
{ rd.module = lookupModule(mname);
|
|
rd.flags = rd.module->flags;
|
|
}
|
|
|
|
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;
|
|
|
|
if ( comments )
|
|
rd.comments = PL_copy_term_ref(comments);
|
|
|
|
rval = read_term(term, &rd PASS_LD);
|
|
if ( Sferror(s) ) {
|
|
free_read_data(&rd);
|
|
return FALSE;
|
|
}
|
|
#ifdef O_QUASIQUOTATIONS
|
|
if ( rval )
|
|
rval = parse_quasi_quotations(&rd PASS_LD);
|
|
#endif
|
|
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.
|
|
|
|
|
|
*/
|
|
static
|
|
PRED_IMPL("read_term", 3, read_term, PL_FA_ISO)
|
|
{ PRED_LD
|
|
IOSTREAM *s;
|
|
|
|
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.
|
|
|
|
|
|
*/
|
|
static
|
|
PRED_IMPL("read_term", 2, read_term, PL_FA_ISO)
|
|
{ PRED_LD
|
|
IOSTREAM *s;
|
|
|
|
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 *
|
|
*******************************/
|
|
|
|
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;
|
|
|
|
stream = Sopenmem(&s, &bufsize, "w");
|
|
stream->encoding = ENC_UTF8;
|
|
PL_write_term(stream, term, 1200, PL_WRT_QUOTED);
|
|
Sflush(stream);
|
|
|
|
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);
|
|
|
|
Sclose(stream);
|
|
if ( s != buf )
|
|
Sfree(s);
|
|
|
|
return rval;
|
|
}
|
|
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
Term
|
|
Yap_StringToTerm(const char *s, size_t len, term_t bindings)
|
|
{ GET_LD;
|
|
read_data rd;
|
|
int rval;
|
|
IOSTREAM *stream;
|
|
source_location oldsrc = LD->read_source;
|
|
|
|
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 PASS_REGS);
|
|
|
|
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();
|
|
return Yap_GetFromSlot( tt PASS_REGS);
|
|
}
|
|
|
|
/** @pred atom_to_term(+ _Atom_, - _Term_, - _Bindings_)
|
|
|
|
|
|
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.
|
|
|
|
|
|
*/
|
|
static
|
|
PRED_IMPL("atom_to_term", 3, atom_to_term, 0)
|
|
{ return atom_to_term(A1, A2, A3);
|
|
}
|
|
|
|
|
|
static
|
|
PRED_IMPL("term_to_atom", 2, term_to_atom, 0)
|
|
{ return atom_to_term(A2, A1, 0);
|
|
}
|
|
|
|
|
|
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);
|
|
if ( !(rval = read_term(t, &rd PASS_LD)) && rd.has_exception )
|
|
PL_put_term(t, rd.exception);
|
|
free_read_data(&rd);
|
|
Sclose(stream);
|
|
LD->read_source = oldsrc;
|
|
|
|
return rval;
|
|
}
|
|
|
|
/*******************************
|
|
* PUBLISH PREDICATES *
|
|
*******************************/
|
|
|
|
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)
|
|
#ifdef O_QUASIQUOTATIONS
|
|
PRED_DEF("$qq_open", 2, qq_open, 0)
|
|
#endif
|
|
EndPredDefs
|
|
|
|
//! @}
|
|
|