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mes/src/reader.c

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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2016,2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
* Copyright © 2018 Jeremiah Orians <jeremiah@pdp10.guru>
*
* This file is part of GNU Mes.
*
* GNU Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* GNU Mes is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include <ctype.h>
SCM
read_input_file_env_ (SCM e, SCM a)
{
if (e == cell_nil)
return e;
return cons (e, read_input_file_env_ (read_env (a), a));
}
SCM
read_input_file_env (SCM a)
{
//r0 = a;
//return read_input_file_env_ (read_env (r0), r0);
return read_input_file_env_ (read_env (cell_nil), cell_nil);
}
int
reader_read_line_comment (int c)
{
while (c != EOF)
{
if (c == '\n')
return c;
c = readchar ();
}
error (cell_symbol_system_error,
MAKE_STRING0 ("reader_read_line_comment"));
}
SCM reader_read_block_comment (int s, int c);
SCM reader_read_hash (int c, SCM a);
SCM reader_read_list (int c, SCM a);
int
reader_identifier_p (int c)
{
return (c > ' ' && c <= '~' && c != '"' && c != ';' && c != '(' && c != ')' && c != EOF);
}
int
reader_end_of_word_p (int c)
{
return (c == '"' || c == ';' || c == '(' || c == ')' || isspace (c) || c == EOF);
}
SCM
reader_read_identifier_or_number (int c)
{
char buf[MAX_STRING];
int i = 0;
long n = 0;
int negative_p = 0;
if (c == '+' && isdigit (peekchar ()))
c = readchar ();
else if (c == '-' && isdigit (peekchar ()))
{
negative_p = 1;
c = readchar ();
}
while (isdigit (c))
{
buf[i++] = c;
n *= 10;
n += c - '0';
c = readchar ();
}
if (reader_end_of_word_p (c))
{
unreadchar (c);
if (negative_p)
n = 0 - n;
return MAKE_NUMBER (n);
}
/* Fallthrough: Note that `4a', `+1b' are identifiers */
while (!reader_end_of_word_p (c))
{
buf[i++] = c;
c = readchar ();
}
unreadchar (c);
buf[i] = 0;
return cstring_to_symbol (buf);
}
SCM
reader_read_sexp_ (int c, SCM a)
{
reset_reader:
if (c == EOF)
return cell_nil;
if (c == ';')
{
c = reader_read_line_comment (c);
goto reset_reader;
}
if ((c == ' ') || (c == '\t') || (c == '\n') || (c == '\f'))
{
c = readchar ();
goto reset_reader;
}
if (c == '(')
return reader_read_list (readchar (), a);
if (c == ')')
return cell_nil;
if (c == '#')
return reader_read_hash (readchar (), a);
if (c == '`')
return cons (cell_symbol_quasiquote,
cons (reader_read_sexp_ (readchar (), a), cell_nil));
if(c == ',')
{
if (peekchar () == '@')
{
readchar ();
return cons (cell_symbol_unquote_splicing,
cons (reader_read_sexp_ (readchar (), a), cell_nil));
}
return cons (cell_symbol_unquote,
cons (reader_read_sexp_ (readchar (), a), cell_nil));
}
if (c == '\'')
return cons (cell_symbol_quote,
cons (reader_read_sexp_ (readchar (), a), cell_nil));
if (c == '"')
return reader_read_string ();
if (c == '.' && (!reader_identifier_p (peekchar ())))
return cell_dot;
return reader_read_identifier_or_number (c);
}
int
reader_eat_whitespace (int c)
{
while (isspace (c))
c = readchar ();
if (c == ';')
return reader_eat_whitespace (reader_read_line_comment (c));
if (c == '#' && (peekchar () == '!' || peekchar () == '|'))
{
c=readchar ();
reader_read_block_comment (c, readchar ());
return reader_eat_whitespace (readchar ());
}
return c;
}
SCM
reader_read_list (int c, SCM a)
{
c = reader_eat_whitespace (c);
if (c == ')')
return cell_nil;
if (c == EOF)
error (cell_symbol_not_a_pair, MAKE_STRING0 ("EOF in list"));
//return cell_nil;
SCM s = reader_read_sexp_ (c, a);
if (s == cell_dot)
return CAR (reader_read_list (readchar (), a));
return cons (s, reader_read_list (readchar (), a));
}
SCM
read_env (SCM a)
{
return reader_read_sexp_ (readchar (), a);
}
SCM
reader_read_block_comment (int s, int c)
{
if (c == s && peekchar () == '#') return readchar ();
return reader_read_block_comment (s, readchar ());
}
SCM
reader_read_hash (int c, SCM a)
{
if (c == '!')
{
reader_read_block_comment (c, readchar ());
return reader_read_sexp_ (readchar (), a);
}
if (c == '|')
{
reader_read_block_comment (c, readchar ());
return reader_read_sexp_ (readchar (), a);
}
if(c == 'f')
return cell_f;
if(c == 't')
return cell_t;
if(c == ',')
{
if (peekchar () == '@')
{
readchar ();
return cons (cell_symbol_unsyntax_splicing,
cons (reader_read_sexp_ (readchar (), a), cell_nil));
}
return cons (cell_symbol_unsyntax,
cons (reader_read_sexp_ (readchar (), a), cell_nil));
}
if (c == '\'')
return cons (cell_symbol_syntax,
cons (reader_read_sexp_ (readchar (), a), cell_nil));
if (c == '`')
return cons (cell_symbol_quasisyntax,
cons (reader_read_sexp_ (readchar (), a), cell_nil));
if (c == ':')
{
SCM x = reader_read_identifier_or_number (readchar ());
if (TYPE (x) == TNUMBER)
error (cell_symbol_system_error, // READ error
cons (MAKE_STRING0 ("keyword perifx ':' not followed by a symbol: "),
x));
return symbol_to_keyword (x);
}
if (c == 'b')
return reader_read_binary ();
if (c == 'o')
return reader_read_octal ();
if (c == 'x')
return reader_read_hex ();
if (c == '\\')
return reader_read_character ();
if (c == '(')
return list_to_vector (reader_read_list (readchar (), a));
if (c == ';')
{
reader_read_sexp_ (readchar (), a);
return reader_read_sexp_ (readchar (), a);
}
return reader_read_sexp_ (readchar (), a);
}
SCM
reader_read_sexp (SCM c, SCM s, SCM a)
{
return reader_read_sexp_ (VALUE (c), a);
}
SCM
reader_read_character ()
{
int c = readchar ();
int p = peekchar ();
int i = 0;
if (c >= '0' && c <= '7'
&& p >= '0' && p <= '7')
{
c = c - '0';
while (p >= '0' && p <= '7')
{
c <<= 3;
c += readchar () - '0';
p = peekchar ();
}
}
else if (c == 'x'
&& ((p >= '0' && p <= '9')
|| (p >= 'a' && p <= 'f')
|| (p >= 'F' && p <= 'F')))
{
c = VALUE (reader_read_hex ());
eputs ("reading hex c=");
eputs (itoa (c));
eputs ("\n");
}
else if (((c >= 'a' && c <= 'z')
|| c == '*')
&& ((p >= 'a' && p <= 'z')
|| p == '*'))
{
char buf[10];
buf[i] = c;
i = i + 1;
while ((p >= 'a' && p <= 'z')
|| p == '*')
{
buf[i] = readchar ();
i = i + 1;
p = peekchar ();
}
buf[i] = 0;
if (!strcmp (buf, "*eof*")) c = EOF;
else if (!strcmp (buf, "nul")) c = '\0';
else if (!strcmp (buf, "alarm")) c = '\a';
else if (!strcmp (buf, "backspace")) c = '\b';
else if (!strcmp (buf, "tab")) c = '\t';
else if (!strcmp (buf, "linefeed")) c = '\n';
else if (!strcmp (buf, "newline")) c = '\n';
else if (!strcmp (buf, "vtab")) c = '\v';
else if (!strcmp (buf, "page")) c = '\f';
#if 1 //__MESC__
//Nyacc bug
else if (!strcmp (buf, "return")) c = 13;
else if (!strcmp (buf, "esc")) c = 27;
#else
else if (!strcmp (buf, "return")) c = '\r';
//Nyacc crash else if (!strcmp (buf, "esc")) c = '\e';
#endif
else if (!strcmp (buf, "space")) c = ' ';
#if 1 // Nyacc uses old abbrevs
else if (!strcmp (buf, "bel")) c = '\a';
else if (!strcmp (buf, "bs")) c = '\b';
else if (!strcmp (buf, "ht")) c = '\t';
else if (!strcmp (buf, "vt")) c = '\v';
#if 1 //__MESC__
//Nyacc bug
else if (!strcmp (buf, "cr")) c = 13;
#else
else if (!strcmp (buf, "cr")) c = '\r';
#endif
#endif // Nyacc uses old abbrevs
else
{
eputs ("char not supported: ");
eputs (buf);
eputs ("\n");
error (cell_symbol_system_error,
MAKE_STRING0 ("char not supported"));
}
}
return MAKE_CHAR (c);
}
SCM
reader_read_binary ()
{
long n = 0;
int c = peekchar ();
int negative_p = 0;
if (c == '-')
{
negative_p = 1;
readchar ();
c = peekchar ();
}
while (c == '0' || c == '1')
{
n = n << 1;
n = n + c - '0';
readchar ();
c = peekchar ();
}
if (negative_p)
n = 0 - n;
return MAKE_NUMBER (n);
}
SCM
reader_read_octal ()
{
long n = 0;
int c = peekchar ();
int negative_p = 0;
if (c == '-')
{
negative_p = 1;
readchar ();
c = peekchar ();
}
while (c >= '0' && c <= '7')
{
n = n << 3;
n = n + c - '0';
readchar ();
c = peekchar ();
}
if (negative_p)
n = 0 - n;
return MAKE_NUMBER (n);
}
SCM
reader_read_hex ()
{
long n = 0;
int c = peekchar ();
int negative_p = 0;
if (c == '-')
{
negative_p = 1;
readchar ();
c = peekchar ();
}
while ((c >= '0' && c <= '9')
|| (c >= 'A' && c <= 'F')
|| (c >= 'a' && c <= 'f'))
{
n = n << 4;
if (c >= 'a')
n = n + c - 'a' + 10;
else if (c >= 'A')
n = n + c - 'A' + 10;
else
n = n + c - '0';
readchar ();
c = peekchar ();
}
if (negative_p)
n = 0 - n;
return MAKE_NUMBER (n);
}
SCM
reader_read_string ()
{
char buf[MAX_STRING];
size_t i = 0;
int c;
do
{
assert (i < MAX_STRING);
c = readchar ();
if (c == '"')
break;
if (c == '\\')
{
c = readchar ();
if (c == '\\' || c == '"')
;
else if (c == '0')
c = '\0';
else if (c == 'a')
c = '\a';
else if (c == 'b')
c = '\b';
else if (c == 't')
c = '\t';
else if (c == 'n')
c = '\n';
else if (c == 'v')
c = '\v';
else if (c == 'f')
c = '\f';
else if (c == 'r')
// Nyacc bug
// c = '\r';
c = 13;
else if (c == 'e')
// Nyacc bug
// c = '\e';
c = 27;
else if (c == 'x')
c = VALUE (reader_read_hex ());
}
buf[i++] = c;
}
while (1);
buf[i] = 0;
return make_string (buf, i);
}
int g_tiny = 0;
int
dump ()
{
r1 = g_symbols;
gc_push_frame ();
gc ();
gc_peek_frame ();
char *p = (char*)g_cells;
putchar ('M');
putchar ('E');
putchar ('S');
putchar (g_stack >> 8);
putchar (g_stack % 256);
eputs ("dumping\n");
// See HACKING, simple crafted dump for tiny-mes.c
if (g_tiny || getenv ("MES_TINY"))
{
eputs ("dumping TINY\n");
TYPE (9) = 0x2d2d2d2d;
CAR (9) = 0x2d2d2d2d;
CDR (9) = 0x3e3e3e3e;
TYPE (10) = TPAIR;
CAR (10) = 11;
CDR (10) = 12;
TYPE (11) = TCHAR;
CAR (11) = 0x58585858;
CDR (11) = 65;
TYPE (12) = TPAIR;
CAR (12) = 13;
CDR (12) = 1;
TYPE (13) = TCHAR;
CAR (11) = 0x58585858;
CDR (13) = 66;
TYPE (14) = 0x3c3c3c3c;
CAR (14) = 0x2d2d2d2d;
CDR (14) = 0x2d2d2d2d;
g_free = 15;
}
else if (g_debug > 1)
{
eputs ("program r2=");
display_error_ (r2);
eputs ("\n");
}
long i;
for (i=0; i<g_free * sizeof (struct scm); i = i + 1)
{
putchar (p[0]);
p = p + 1;
}
return 0;
}
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