-/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
- * If you do not wish that, delete this exception notice.
- */
+ * If you do not wish that, delete this exception notice. */
\f
-#include "extchrs.h"
#include <stdio.h>
#include "_scm.h"
#include "chars.h"
#include "genio.h"
#include "eval.h"
#include "unif.h"
-#include "mbstrings.h"
#include "kw.h"
#include "alist.h"
#include "srcprop.h"
\f
-#define default_case_i 0
-
-\f
+SCM_SYMBOL (scm_keyword_prefix, "prefix");
scm_option scm_read_opts[] = {
{ SCM_OPTION_BOOLEAN, "copy", 0,
"Copy source code expressions." },
{ SCM_OPTION_BOOLEAN, "positions", 0,
- "Record positions of source code expressions." }
+ "Record positions of source code expressions." },
+ { SCM_OPTION_BOOLEAN, "case-insensitive", 0,
+ "Convert symbols to lower case."},
+ { SCM_OPTION_SCM, "keywords", SCM_BOOL_F,
+ "Style of keyword recognition: #f or 'prefix"}
};
SCM_PROC (s_read_options, "read-options-interface", 0, 1, 0, scm_read_options);
return ans;
}
-SCM_PROC (s_read, "read", 0, 3, 0, scm_read);
+/* An association list mapping extra hash characters to procedures. */
+static SCM *scm_read_hash_procedures;
+
+SCM_PROC (s_read, "read", 0, 1, 0, scm_read);
SCM
-scm_read (port, case_insensitive_p, sharp)
+scm_read (port)
SCM port;
- SCM case_insensitive_p;
- SCM sharp;
{
int c;
SCM tok_buf, copy;
- int case_i;
if (SCM_UNBNDP (port))
port = scm_cur_inp;
SCM_ARG1,
s_read);
- case_i = (SCM_UNBNDP (case_insensitive_p)
- ? default_case_i
- : (case_insensitive_p == SCM_BOOL_F));
-
- if (SCM_UNBNDP (sharp))
- sharp = SCM_BOOL_F;
-
c = scm_flush_ws (port, (char *) NULL);
if (EOF == c)
return SCM_EOF_VAL;
- scm_gen_ungetc (c, port);
+ scm_ungetc (c, port);
tok_buf = scm_makstr (30L, 0);
- return scm_lreadr (&tok_buf, port, case_i, sharp, ©);
+ return scm_lreadr (&tok_buf, port, ©);
}
{
register int c;
while (1)
- switch (c = scm_gen_getc (port))
+ switch (c = scm_getc (port))
{
case EOF:
goteof:
return c;
case ';':
lp:
- switch (c = scm_gen_getc (port))
+ switch (c = scm_getc (port))
{
case EOF:
goto goteof;
/* recsexpr is used when recording expressions
* constructed by read:sharp.
*/
-
+#ifndef DEBUG_EXTENSIONS
+#define recsexpr(obj, line, column, filename) (obj)
+#else
static SCM recsexpr SCM_P ((SCM obj, int line, int column, SCM filename));
static SCM
return obj;
}
}
-
+#endif
/* Consume an SCSH-style block comment. Assume that we've already
- read the initial `#!', and eat characters until the matching `!#'. */
+ read the initial `#!', and eat characters until we get a
+ newline/exclamation-point/sharp-sign/newline sequence. */
static void
skip_scsh_block_comment (port)
SCM port;
{
- char last_c = '\0';
+ /* Is this portable? Dear God, spare me from the non-eight-bit
+ characters. But is it tasteful? */
+ long history = 0;
for (;;)
{
- int c = scm_gen_getc (port);
+ int c = scm_getc (port);
if (c == EOF)
scm_wta (SCM_UNDEFINED,
"unterminated `#! ... !#' comment", "read");
- else if (c == '#' && last_c == '!')
- return;
+ history = ((history << 8) | (c & 0xff)) & 0xffffffff;
- last_c = c;
+ /* Were the last four characters read "\n!#\n"? */
+ if (history == (('\n' << 24) | ('!' << 16) | ('#' << 8) | '\n'))
+ return;
}
}
+static SCM
+scm_get_hash_procedure SCM_P ((int c));
static char s_list[]="list";
SCM
-scm_lreadr (tok_buf, port, case_i, sharp, copy)
+scm_lreadr (tok_buf, port, copy)
SCM *tok_buf;
SCM port;
- int case_i;
- SCM sharp;
SCM *copy;
{
int c;
scm_sizet j;
SCM p;
-
+
tryagain:
c = scm_flush_ws (port, s_read);
tryagain_no_flush_ws:
case '(':
return SCM_RECORD_POSITIONS_P
- ? scm_lreadrecparen (tok_buf, port, s_list, case_i, sharp, copy)
- : scm_lreadparen (tok_buf, port, s_list, case_i, sharp, copy);
+ ? scm_lreadrecparen (tok_buf, port, s_list, copy)
+ : scm_lreadparen (tok_buf, port, s_list, copy);
case ')':
scm_wta (SCM_UNDEFINED, "unexpected \")\"", "read");
goto tryagain;
p = scm_i_quasiquote;
goto recquote;
case ',':
- c = scm_gen_getc (port);
+ c = scm_getc (port);
if ('@' == c)
p = scm_i_uq_splicing;
else
{
- scm_gen_ungetc (c, port);
+ scm_ungetc (c, port);
p = scm_i_unquote;
}
recquote:
p = scm_cons2 (p,
- scm_lreadr (tok_buf, port, case_i, sharp, copy),
+ scm_lreadr (tok_buf, port, copy),
SCM_EOL);
if (SCM_RECORD_POSITIONS_P)
scm_whash_insert (scm_source_whash,
SCM_EOL));
return p;
case '#':
- c = scm_gen_getc (port);
+ c = scm_getc (port);
switch (c)
{
case '(':
- p = scm_lreadparen (tok_buf, port, "vector", case_i, sharp, copy);
+ p = scm_lreadparen (tok_buf, port, "vector", copy);
return SCM_NULLP (p) ? scm_nullvect : scm_vector (p);
case 't':
case 'I':
case 'e':
case 'E':
- scm_gen_ungetc (c, port);
+ scm_ungetc (c, port);
c = '#';
goto num;
goto tryagain_no_flush_ws;
case '*':
- j = scm_read_token (c, tok_buf, port, case_i, 0);
+ j = scm_read_token (c, tok_buf, port, 0);
p = scm_istr2bve (SCM_CHARS (*tok_buf) + 1, (long) (j - 1));
if (SCM_NFALSEP (p))
return p;
goto unkshrp;
case '{':
- j = scm_read_token (c, tok_buf, port, case_i, 1);
+ j = scm_read_token (c, tok_buf, port, 1);
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);
case '\\':
- c = scm_gen_getc (port);
- j = scm_read_token (c, tok_buf, port, case_i, 0);
+ c = scm_getc (port);
+ j = scm_read_token (c, tok_buf, port, 0);
if (j == 1)
return SCM_MAKICHR (c);
if (c >= '0' && c < '8')
return SCM_MAKICHR (scm_charnums[c]);
scm_wta (SCM_UNDEFINED, "unknown # object: #\\", SCM_CHARS (*tok_buf));
+ /* #:SYMBOL is a syntax for keywords supported in all contexts. */
+ case ':':
+ j = scm_read_token ('-', tok_buf, port, 0);
+ p = scm_intern (SCM_CHARS (*tok_buf), j);
+ return scm_make_keyword_from_dash_symbol (SCM_CAR (p));
default:
callshrp:
- if (SCM_NIMP (sharp))
- {
- int line = SCM_LINUM (port);
- int column = SCM_COL (port) - 2;
- SCM got;
- got = scm_apply (sharp,
- SCM_MAKICHR (c),
- scm_acons (port, SCM_EOL, SCM_EOL));
- if (SCM_UNSPECIFIED == got)
- goto unkshrp;
- if (SCM_RECORD_POSITIONS_P)
- return *copy = recsexpr (got, line, column,
- SCM_FILENAME (port));
- else
- return got;
- }
+ {
+ SCM sharp = scm_get_hash_procedure (c);
+
+ if (SCM_NIMP (sharp))
+ {
+ int line = SCM_LINUM (port);
+ int column = SCM_COL (port) - 2;
+ SCM got;
+
+ got = scm_apply (sharp,
+ SCM_MAKICHR (c),
+ scm_acons (port, SCM_EOL, SCM_EOL));
+ if (SCM_UNSPECIFIED == got)
+ goto unkshrp;
+ if (SCM_RECORD_POSITIONS_P)
+ return *copy = recsexpr (got, line, column,
+ SCM_FILENAME (port));
+ else
+ return got;
+ }
+ }
unkshrp:
scm_misc_error (s_read, "Unknown # object: %S",
scm_listify (SCM_MAKICHR (c), SCM_UNDEFINED));
case '"':
j = 0;
- while ('"' != (c = scm_gen_getc (port)))
+ while ('"' != (c = scm_getc (port)))
{
SCM_ASSERT (EOF != c, SCM_UNDEFINED, "end of file in ", "string");
- while (j + sizeof(xwchar_t) + XMB_CUR_MAX >= SCM_LENGTH (*tok_buf))
+ while (j + 2 >= SCM_LENGTH (*tok_buf))
scm_grow_tok_buf (tok_buf);
if (c == '\\')
- switch (c = scm_gen_getc (port))
+ switch (c = scm_getc (port))
{
case '\n':
continue;
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;
- }
+ SCM_CHARS (*tok_buf)[j] = c;
+ ++j;
}
if (j == 0)
return scm_nullstr;
{
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 '-':
case '+':
num:
- j = scm_read_token (c, tok_buf, port, case_i, 0);
+ j = scm_read_token (c, tok_buf, port, 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) == '('))
+ if ((j == 2) && (scm_getc (port) == '('))
{
- scm_gen_ungetc ('(', port);
+ scm_ungetc ('(', port);
c = SCM_CHARS (*tok_buf)[1];
goto callshrp;
}
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));
-
+ if (SCM_KEYWORD_STYLE == scm_keyword_prefix)
+ {
+ j = scm_read_token ('-', tok_buf, port, 0);
+ p = scm_intern (SCM_CHARS (*tok_buf), j);
+ return scm_make_keyword_from_dash_symbol (SCM_CAR (p));
+ }
+ /* fallthrough */
default:
- j = scm_read_token (c, tok_buf, port, case_i, 0);
+ j = scm_read_token (c, tok_buf, port, 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);
}
}
#endif
scm_sizet
-scm_read_token (ic, tok_buf, port, case_i, weird)
+scm_read_token (ic, tok_buf, port, weird)
int ic;
SCM *tok_buf;
SCM port;
- int case_i;
int weird;
{
register scm_sizet j;
register int c;
register char *p;
- c = ic;
+ c = (SCM_CASE_INSENSITIVE_P ? scm_downcase(ic) : ic);
p = SCM_CHARS (*tok_buf);
if (weird)
else
{
j = 0;
- while (j + sizeof(xwchar_t) + XMB_CUR_MAX >= SCM_LENGTH (*tok_buf))
+ while (j + 2 >= 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;
- }
+ p[j] = c;
+ ++j;
}
while (1)
{
- while (j + sizeof(xwchar_t) + XMB_CUR_MAX >= SCM_LENGTH (*tok_buf))
+ while (j + 2 >= SCM_LENGTH (*tok_buf))
p = scm_grow_tok_buf (tok_buf);
- c = scm_gen_getc (port);
+ c = scm_getc (port);
switch (c)
{
case '(':
if (weird)
goto default_case;
- scm_gen_ungetc (c, port);
+ scm_ungetc (c, port);
case EOF:
eof_case:
p[j] = 0;
goto default_case;
else
{
- c = scm_gen_getc (port);
+ c = scm_getc (port);
if (c == EOF)
goto eof_case;
else
if (!weird)
goto default_case;
- c = scm_gen_getc (port);
+ c = scm_getc (port);
if (c == '#')
{
p[j] = 0;
}
else
{
- scm_gen_ungetc (c, port);
+ scm_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;
- }
+ c = (SCM_CASE_INSENSITIVE_P ? scm_downcase(c) : c);
+ p[j] = c;
+ ++j;
}
}
#endif
SCM
-scm_lreadparen (tok_buf, port, name, case_i, sharp, copy)
+scm_lreadparen (tok_buf, port, name, copy)
SCM *tok_buf;
SCM port;
char *name;
- int case_i;
- SCM sharp;
SCM *copy;
{
SCM tmp;
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, copy)))
+ scm_ungetc (c, port);
+ if (scm_i_dot == (tmp = scm_lreadr (tok_buf, port, copy)))
{
- ans = scm_lreadr (tok_buf, port, case_i, sharp, copy);
+ ans = scm_lreadr (tok_buf, port, copy);
closeit:
if (')' != (c = scm_flush_ws (port, name)))
scm_wta (SCM_UNDEFINED, "missing close paren", "");
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, copy)))
+ scm_ungetc (c, port);
+ if (scm_i_dot == (tmp = scm_lreadr (tok_buf, port, copy)))
{
- SCM_SETCDR (tl, scm_lreadr (tok_buf, port, case_i, sharp, copy));
+ SCM_SETCDR (tl, scm_lreadr (tok_buf, port, copy));
goto closeit;
}
SCM_SETCDR (tl, scm_cons (tmp, SCM_EOL));
SCM
-scm_lreadrecparen (tok_buf, port, name, case_i, sharp, copy)
+scm_lreadrecparen (tok_buf, port, name, copy)
SCM *tok_buf;
SCM port;
char *name;
- int case_i;
- SCM sharp;
SCM *copy;
{
register 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, copy)))
+ scm_ungetc (c, port);
+ if (scm_i_dot == (tmp = scm_lreadr (tok_buf, port, copy)))
{
- ans = scm_lreadr (tok_buf, port, case_i, sharp, copy);
+ ans = scm_lreadr (tok_buf, port, copy);
if (')' != (c = scm_flush_ws (port, name)))
scm_wta (SCM_UNDEFINED, "missing close paren", "");
return ans;
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, copy)))
+ scm_ungetc (c, port);
+ if (scm_i_dot == (tmp = scm_lreadr (tok_buf, port, copy)))
{
- SCM_SETCDR (tl, tmp = scm_lreadr (tok_buf, port, case_i, sharp, copy));
+ SCM_SETCDR (tl, tmp = scm_lreadr (tok_buf, port, copy));
if (SCM_COPY_SOURCE_P)
SCM_SETCDR (tl2, scm_cons (SCM_NIMP (tmp) && SCM_CONSP (tmp)
? *copy
\f
+/* Manipulate the read-hash-procedures alist. This could be written in
+ Scheme, but maybe it will also be used by C code during initialisation. */
+SCM_PROC (s_read_hash_extend, "read-hash-extend", 2, 0, 0, scm_read_hash_extend);
+SCM
+scm_read_hash_extend (chr, proc)
+ SCM chr;
+ SCM proc;
+{
+ SCM this;
+ SCM prev;
+
+ SCM_ASSERT (SCM_ICHRP(chr), chr, SCM_ARG1, s_read_hash_extend);
+ SCM_ASSERT (SCM_FALSEP (proc) || SCM_NIMP(proc), proc, SCM_ARG2,
+ s_read_hash_extend);
+
+ /* Check if chr is already in the alist. */
+ this = *scm_read_hash_procedures;
+ prev = SCM_BOOL_F;
+ while (1)
+ {
+ if (SCM_NULLP (this))
+ {
+ /* not found, so add it to the beginning. */
+ if (SCM_NFALSEP (proc))
+ {
+ *scm_read_hash_procedures =
+ scm_cons (scm_cons (chr, proc), *scm_read_hash_procedures);
+ }
+ break;
+ }
+ if (chr == SCM_CAAR (this))
+ {
+ /* already in the alist. */
+ if (SCM_FALSEP (proc))
+ {
+ /* remove it. */
+ if (prev == SCM_BOOL_F)
+ {
+ *scm_read_hash_procedures =
+ SCM_CDR (*scm_read_hash_procedures);
+ }
+ else
+ scm_set_cdr_x (prev, SCM_CDR (this));
+ }
+ else
+ {
+ /* replace it. */
+ scm_set_cdr_x (SCM_CAR (this), proc);
+ }
+ break;
+ }
+ prev = this;
+ this = SCM_CDR (this);
+ }
+
+ return SCM_UNSPECIFIED;
+}
+/* Recover the read-hash procedure corresponding to char c. */
+static SCM
+scm_get_hash_procedure (c)
+ int c;
+{
+ SCM rest = *scm_read_hash_procedures;
+
+ while (1)
+ {
+ if (SCM_NULLP (rest))
+ return SCM_BOOL_F;
+
+ if (SCM_ICHR (SCM_CAAR (rest)) == c)
+ return SCM_CDAR (rest);
+
+ rest = SCM_CDR (rest);
+ }
+}
void
scm_init_read ()
{
+ scm_read_hash_procedures =
+ SCM_CDRLOC (scm_sysintern ("read-hash-procedures", SCM_EOL));
+
scm_init_opts (scm_read_options, scm_read_opts, SCM_N_READ_OPTIONS);
#include "read.x"
}