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https://git.savannah.gnu.org/git/guile.git
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621 lines
13 KiB
C
621 lines
13 KiB
C
/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
|
||
* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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*/
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#include "extchrs.h"
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#include <stdio.h>
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#include "_scm.h"
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#include "chars.h"
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#include "genio.h"
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#include "eval.h"
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#include "unif.h"
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#include "mbstrings.h"
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#include "kw.h"
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#include "alist.h"
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#include "read.h"
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#define default_case_i 0
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#ifdef READER_EXTENSIONS
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scm_option scm_read_opts[] = {
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{ SCM_OPTION_BOOLEAN, "copy", 0,
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"Copy source code expressions." },
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{ SCM_OPTION_BOOLEAN, "positions", 0,
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"Record positions of source code expressions." }
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};
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SCM_PROC (s_read_options, "read-options-interface", 0, 1, 0, scm_read_options);
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#ifdef __STDC__
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SCM
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scm_read_options (SCM setting)
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#else
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SCM
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scm_read_options (setting)
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SCM setting;
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#endif
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{
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SCM ans = scm_options (setting,
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scm_read_opts,
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SCM_N_READ_OPTIONS,
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s_read_options);
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if (SCM_COPY_SOURCE_P)
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SCM_RECORD_POSITIONS_P = 1;
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return ans;
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}
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#endif
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SCM_PROC (s_read, "read", 0, 3, 0, scm_read);
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#ifdef __STDC__
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SCM
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scm_read (SCM port, SCM case_insensitive_p, SCM sharp)
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#else
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SCM
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scm_read (port, case_insensitive_p, sharp)
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SCM port;
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SCM case_insensitive_p;
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SCM sharp;
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#endif
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{
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int c;
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SCM tok_buf;
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int case_i;
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if (SCM_UNBNDP (port))
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port = scm_cur_inp;
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else
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SCM_ASSERT (SCM_NIMP (port) && SCM_OPINPORTP (port), port, SCM_ARG1, s_read);
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case_i = (SCM_UNBNDP (case_insensitive_p)
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? default_case_i
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: (case_insensitive_p == SCM_BOOL_F));
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if (SCM_UNBNDP (sharp))
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sharp = SCM_BOOL_F;
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c = scm_flush_ws (port, (char *) NULL);
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if (EOF == c)
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return SCM_EOF_VAL;
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scm_gen_ungetc (c, port);
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tok_buf = scm_makstr (30L, 0);
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return scm_lreadr (&tok_buf, port, case_i, sharp);
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}
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#ifdef __STDC__
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char *
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scm_grow_tok_buf (SCM * tok_buf)
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#else
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char *
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scm_grow_tok_buf (tok_buf)
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SCM * tok_buf;
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#endif
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{
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scm_vector_set_length_x (*tok_buf, SCM_MAKINUM (2 * SCM_LENGTH (*tok_buf)));
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return SCM_CHARS (*tok_buf);
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}
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#ifdef __STDC__
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int
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scm_flush_ws (SCM port, char *eoferr)
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#else
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int
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scm_flush_ws (port, eoferr)
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SCM port;
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char *eoferr;
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#endif
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{
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register int c;
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while (1)
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switch (c = scm_gen_getc (port))
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{
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case EOF:
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goteof:
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if (eoferr)
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scm_wta (SCM_UNDEFINED, "end of file in ", eoferr);
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return c;
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case ';':
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lp:
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switch (c = scm_gen_getc (port))
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{
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case EOF:
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goto goteof;
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default:
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goto lp;
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case SCM_LINE_INCREMENTORS:
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break;
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}
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break;
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case SCM_LINE_INCREMENTORS:
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break;
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case SCM_SINGLE_SPACES:
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SCM_INCCOL (port);
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break;
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case '\t':
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SCM_TABCOL (port);
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break;
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default:
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return c;
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}
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}
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#ifdef __STDC__
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int
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scm_casei_streq (char * s1, char * s2)
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#else
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int
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scm_casei_streq (s1, s2)
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char * s1;
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char * s2;
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#endif
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{
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while (*s1 && *s2)
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if (scm_downcase((int)*s1) != scm_downcase((int)*s2))
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return 0;
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else
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{
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++s1;
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++s2;
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}
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return !(*s1 || *s2);
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}
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#ifdef __STDC__
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SCM
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scm_lreadr (SCM * tok_buf, SCM port, int case_i, SCM sharp)
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#else
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SCM
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scm_lreadr (tok_buf, port, case_i, sharp)
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SCM * tok_buf;
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SCM port;
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int case_i;
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SCM sharp;
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#endif
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{
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int c;
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scm_sizet j;
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SCM p;
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tryagain:
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c = scm_flush_ws (port, s_read);
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switch (c)
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{
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case EOF:
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return SCM_EOF_VAL;
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case '(':
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return scm_lreadparen (tok_buf, port, "list", case_i, sharp);
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case ')':
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scm_wta (SCM_UNDEFINED, "unexpected \")\"", "read");
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goto tryagain;
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case '\'':
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return scm_cons2 (scm_i_quote, scm_lreadr (tok_buf, port, case_i, sharp), SCM_EOL);
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case '`':
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return scm_cons2 (scm_i_quasiquote, scm_lreadr (tok_buf, port, case_i, sharp), SCM_EOL);
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case ',':
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c = scm_gen_getc (port);
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if ('@' == c)
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p = scm_i_uq_splicing;
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else
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{
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scm_gen_ungetc (c, port);
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p = scm_i_unquote;
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}
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return scm_cons2 (p, scm_lreadr (tok_buf, port, case_i, sharp), SCM_EOL);
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case '#':
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c = scm_gen_getc (port);
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switch (c)
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{
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case '(':
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p = scm_lreadparen (tok_buf, port, "vector", case_i, sharp);
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return SCM_NULLP (p) ? scm_nullvect : scm_vector (p);
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case 't':
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case 'T':
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return SCM_BOOL_T;
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case 'f':
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case 'F':
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return SCM_BOOL_F;
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case 'b':
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case 'B':
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case 'o':
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case 'O':
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case 'd':
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case 'D':
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case 'x':
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case 'X':
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case 'i':
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case 'I':
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case 'e':
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case 'E':
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scm_gen_ungetc (c, port);
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c = '#';
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goto num;
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case '*':
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j = scm_read_token (c, tok_buf, port, case_i, 0);
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p = scm_istr2bve (SCM_CHARS (*tok_buf) + 1, (long) (j - 1));
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if (SCM_NFALSEP (p))
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return p;
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else
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goto unkshrp;
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case '{':
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j = scm_read_token (c, tok_buf, port, case_i, 1);
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p = scm_intern (SCM_CHARS (*tok_buf), j);
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if (SCM_PORT_REPRESENTATION (port) != scm_regular_port)
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scm_set_symbol_multi_byte_x (SCM_CAR (p), SCM_BOOL_T);
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return SCM_CAR (p);
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case '\\':
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c = scm_gen_getc (port);
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j = scm_read_token (c, tok_buf, port, case_i, 0);
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if (j == 1)
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return SCM_MAKICHR (c);
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if (c >= '0' && c < '8')
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{
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p = scm_istr2int (SCM_CHARS (*tok_buf), (long) j, 8);
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if (SCM_NFALSEP (p))
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return SCM_MAKICHR (SCM_INUM (p));
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}
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for (c = 0; c < scm_n_charnames; c++)
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if (scm_charnames[c]
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&& (scm_casei_streq (scm_charnames[c], SCM_CHARS (*tok_buf))))
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return SCM_MAKICHR (scm_charnums[c]);
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scm_wta (SCM_UNDEFINED, "unknown # object: #\\", SCM_CHARS (*tok_buf));
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default:
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callshrp:
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if (SCM_NIMP (sharp))
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{
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SCM got;
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got = scm_apply (sharp, SCM_MAKICHR (c), scm_acons (port, SCM_EOL, SCM_EOL));
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if (SCM_UNSPECIFIED == got)
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goto unkshrp;
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return got;
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}
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unkshrp:scm_wta ((SCM) SCM_MAKICHR (c), "unknown # object", "");
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}
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case '"':
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j = 0;
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while ('"' != (c = scm_gen_getc (port)))
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{
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SCM_ASSERT (EOF != c, SCM_UNDEFINED, "end of file in ", "string");
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while (j + sizeof(xwchar_t) + XMB_CUR_MAX >= SCM_LENGTH (*tok_buf))
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scm_grow_tok_buf (tok_buf);
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if (c == '\\')
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switch (c = scm_gen_getc (port))
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{
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||
case '\n':
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continue;
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case '0':
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c = '\0';
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break;
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case 'f':
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c = '\f';
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break;
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case 'n':
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c = '\n';
|
||
break;
|
||
case 'r':
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||
c = '\r';
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break;
|
||
case 't':
|
||
c = '\t';
|
||
break;
|
||
case 'a':
|
||
c = '\007';
|
||
break;
|
||
case 'v':
|
||
c = '\v';
|
||
break;
|
||
}
|
||
if (SCM_PORT_REPRESENTATION(port) == scm_regular_port)
|
||
{
|
||
SCM_CHARS (*tok_buf)[j] = c;
|
||
++j;
|
||
}
|
||
else
|
||
{
|
||
int len;
|
||
len = xwctomb (SCM_CHARS (*tok_buf) + j, c);
|
||
if (len == 0)
|
||
len = 1;
|
||
SCM_ASSERT (len > 0, SCM_MAKINUM (c), "bogus char", "read");
|
||
j += len;
|
||
}
|
||
}
|
||
if (j == 0)
|
||
return scm_nullstr;
|
||
SCM_CHARS (*tok_buf)[j] = 0;
|
||
{
|
||
SCM str;
|
||
str = scm_makfromstr (SCM_CHARS (*tok_buf), j, 0);
|
||
if (SCM_PORT_REPRESENTATION(port) != scm_regular_port)
|
||
{
|
||
SCM_SETLENGTH (str, SCM_LENGTH (str), scm_tc7_mb_string);
|
||
}
|
||
return str;
|
||
}
|
||
|
||
case'0':case '1':case '2':case '3':case '4':
|
||
case '5':case '6':case '7':case '8':case '9':
|
||
case '.':
|
||
case '-':
|
||
case '+':
|
||
num:
|
||
j = scm_read_token (c, tok_buf, port, case_i, 0);
|
||
p = scm_istring2number (SCM_CHARS (*tok_buf), (long) j, 10L);
|
||
if (SCM_NFALSEP (p))
|
||
return p;
|
||
if (c == '#')
|
||
{
|
||
if ((j == 2) && (scm_gen_getc (port) == '('))
|
||
{
|
||
scm_gen_ungetc ('(', port);
|
||
c = SCM_CHARS (*tok_buf)[1];
|
||
goto callshrp;
|
||
}
|
||
scm_wta (SCM_UNDEFINED, "unknown # object", SCM_CHARS (*tok_buf));
|
||
}
|
||
goto tok;
|
||
|
||
case ':':
|
||
j = scm_read_token ('-', tok_buf, port, case_i, 0);
|
||
p = scm_intern (SCM_CHARS (*tok_buf), j);
|
||
if (SCM_PORT_REPRESENTATION (port) != scm_regular_port)
|
||
scm_set_symbol_multi_byte_x (SCM_CAR (p), SCM_BOOL_T);
|
||
return scm_make_keyword_from_dash_symbol (SCM_CAR (p));
|
||
|
||
default:
|
||
j = scm_read_token (c, tok_buf, port, case_i, 0);
|
||
/* fallthrough */
|
||
|
||
tok:
|
||
p = scm_intern (SCM_CHARS (*tok_buf), j);
|
||
if (SCM_PORT_REPRESENTATION (port) != scm_regular_port)
|
||
scm_set_symbol_multi_byte_x (SCM_CAR (p), SCM_BOOL_T);
|
||
return SCM_CAR (p);
|
||
}
|
||
}
|
||
|
||
#ifdef _UNICOS
|
||
_Pragma ("noopt"); /* # pragma _CRI noopt */
|
||
#endif
|
||
#ifdef __STDC__
|
||
scm_sizet
|
||
scm_read_token (int ic, SCM * tok_buf, SCM port, int case_i, int weird)
|
||
#else
|
||
scm_sizet
|
||
scm_read_token (ic, * tok_buf, port, case_i, weird)
|
||
int ic;
|
||
SCM *tok_buf;
|
||
SCM port;
|
||
int case_i;
|
||
int weird;
|
||
#endif
|
||
{
|
||
register scm_sizet j;
|
||
register int c;
|
||
register char *p;
|
||
|
||
c = ic;
|
||
p = SCM_CHARS (*tok_buf);
|
||
|
||
if (weird)
|
||
j = 0;
|
||
else
|
||
{
|
||
j = 0;
|
||
while (j + sizeof(xwchar_t) + XMB_CUR_MAX >= SCM_LENGTH (*tok_buf))
|
||
p = scm_grow_tok_buf (tok_buf);
|
||
if (SCM_PORT_REPRESENTATION(port) == scm_regular_port)
|
||
{
|
||
p[j] = c;
|
||
++j;
|
||
}
|
||
else
|
||
{
|
||
int len;
|
||
len = xwctomb (p + j, c);
|
||
if (len == 0)
|
||
len = 1;
|
||
SCM_ASSERT (len > 0, SCM_MAKINUM (c), "bogus char", "read");
|
||
j += len;
|
||
}
|
||
}
|
||
|
||
while (1)
|
||
{
|
||
while (j + sizeof(xwchar_t) + XMB_CUR_MAX >= SCM_LENGTH (*tok_buf))
|
||
p = scm_grow_tok_buf (tok_buf);
|
||
c = scm_gen_getc (port);
|
||
switch (c)
|
||
{
|
||
case '(':
|
||
case ')':
|
||
case '"':
|
||
case ';':
|
||
case SCM_WHITE_SPACES:
|
||
case SCM_LINE_INCREMENTORS:
|
||
if (weird)
|
||
goto default_case;
|
||
|
||
scm_gen_ungetc (c, port);
|
||
case EOF:
|
||
eof_case:
|
||
p[j] = 0;
|
||
return j;
|
||
case '\\':
|
||
if (!weird)
|
||
goto default_case;
|
||
else
|
||
{
|
||
c = scm_gen_getc (port);
|
||
if (c == EOF)
|
||
goto eof_case;
|
||
else
|
||
goto default_case;
|
||
}
|
||
case '}':
|
||
if (!weird)
|
||
goto default_case;
|
||
|
||
c = scm_gen_getc (port);
|
||
if (c == '#')
|
||
{
|
||
p[j] = 0;
|
||
return j;
|
||
}
|
||
else
|
||
{
|
||
scm_gen_ungetc (c, port);
|
||
c = '}';
|
||
goto default_case;
|
||
}
|
||
|
||
default:
|
||
default_case:
|
||
{
|
||
c = (case_i ? scm_downcase(c) : c);
|
||
if (SCM_PORT_REPRESENTATION(port) == scm_regular_port)
|
||
{
|
||
p[j] = c;
|
||
++j;
|
||
}
|
||
else
|
||
{
|
||
int len;
|
||
len = xwctomb (p + j, c);
|
||
if (len == 0)
|
||
len = 1;
|
||
SCM_ASSERT (len > 0, SCM_MAKINUM (c), "bogus char", "read");
|
||
j += len;
|
||
}
|
||
}
|
||
|
||
}
|
||
}
|
||
}
|
||
#ifdef _UNICOS
|
||
_Pragma ("opt"); /* # pragma _CRI opt */
|
||
#endif
|
||
|
||
#ifdef __STDC__
|
||
SCM
|
||
scm_lreadparen (SCM * tok_buf, SCM port, char *name, int case_i, SCM sharp)
|
||
#else
|
||
SCM
|
||
scm_lreadparen (tok_buf, port, name, case_i, sharp)
|
||
SCM *tok_buf;
|
||
SCM port;
|
||
char *name;
|
||
int case_i;
|
||
SCM sharp;
|
||
#endif
|
||
{
|
||
SCM tmp;
|
||
SCM tl;
|
||
SCM ans;
|
||
int c;
|
||
|
||
c = scm_flush_ws (port, name);
|
||
if (')' == c)
|
||
return SCM_EOL;
|
||
scm_gen_ungetc (c, port);
|
||
if (scm_i_dot == (tmp = scm_lreadr (tok_buf, port, case_i, sharp)))
|
||
{
|
||
ans = scm_lreadr (tok_buf, port, case_i, sharp);
|
||
closeit:
|
||
if (')' != (c = scm_flush_ws (port, name)))
|
||
scm_wta (SCM_UNDEFINED, "missing close paren", "");
|
||
return ans;
|
||
}
|
||
ans = tl = scm_cons (tmp, SCM_EOL);
|
||
while (')' != (c = scm_flush_ws (port, name)))
|
||
{
|
||
scm_gen_ungetc (c, port);
|
||
if (scm_i_dot == (tmp = scm_lreadr (tok_buf, port, case_i, sharp)))
|
||
{
|
||
SCM_CDR (tl) = scm_lreadr (tok_buf, port, case_i, sharp);
|
||
goto closeit;
|
||
}
|
||
tl = (SCM_CDR (tl) = scm_cons (tmp, SCM_EOL));
|
||
}
|
||
return ans;
|
||
}
|
||
|
||
|
||
|
||
|
||
|
||
#ifdef __STDC__
|
||
void
|
||
scm_init_read (void)
|
||
#else
|
||
void
|
||
scm_init_read ()
|
||
#endif
|
||
{
|
||
#ifdef READER_EXTENSIONS
|
||
scm_init_opts (scm_read_options, scm_read_opts, SCM_N_READ_OPTIONS);
|
||
#endif
|
||
#include "read.x"
|
||
}
|
||
|