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mes/src/reader.c

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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2016,2017,2018,2019,2020 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 "mes/lib.h"
#include "mes/mes.h"
#include <ctype.h>
#include <stdio.h>
#include <string.h>
struct scm *
read_input_file_env_ (struct scm *e, struct scm *a)
{
if (e == cell_nil)
return e;
return cons (e, read_input_file_env_ (read_env (a), a));
}
struct scm *
read_input_file_env (struct scm *a)
{
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"));
}
struct scm *reader_read_block_comment (int s, int c);
struct scm *reader_read_hash (int c, struct scm *a);
struct scm *reader_read_list (int c, struct 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);
}
struct scm *
reader_read_identifier_or_number (int c)
{
int i = 0;
long n = 0;
int negative_p = 0;
if (c == '+')
if (isdigit (peekchar ()) != 0)
c = readchar ();
if (c == '-')
if (isdigit (peekchar ()) != 0)
{
negative_p = 1;
c = readchar ();
}
while (isdigit (c) != 0)
{
g_buf[i] = c;
i = i + 1;
n = n * 10;
n = n + c - '0';
c = readchar ();
}
if (reader_end_of_word_p (c) != 0)
{
unreadchar (c);
if (negative_p != 0)
n = 0 - n;
return make_number (n);
}
/* Fallthrough: Note that `4a', `+1b' are identifiers */
while (reader_end_of_word_p (c) == 0)
{
g_buf[i] = c;
i = i + 1;
c = readchar ();
}
unreadchar (c);
g_buf[i] = 0;
return cstring_to_symbol (g_buf);
}
struct scm *
reader_read_sexp_ (int c, struct 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 == '.')
if (reader_identifier_p (peekchar ()) == 0)
return cell_dot;
return reader_read_identifier_or_number (c);
}
int
reader_eat_whitespace (int c)
{
while (isspace (c) != 0)
c = readchar ();
if (c == ';')
return reader_eat_whitespace (reader_read_line_comment (c));
if (c == '#')
{
int p = peekchar ();
if (p == '!' || p == '|')
{
c = readchar ();
reader_read_block_comment (c, readchar ());
return reader_eat_whitespace (readchar ());
}
}
return c;
}
struct scm *
reader_read_list (int c, struct 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"));
struct scm *s = reader_read_sexp_ (c, a);
if (s == cell_dot)
{
s = reader_read_list (readchar (), a);
return s->car;
}
return cons (s, reader_read_list (readchar (), a));
}
struct scm *
read_env (struct scm *a)
{
return reader_read_sexp_ (readchar (), a);
}
struct scm *
reader_read_block_comment (int s, int c)
{
if (c == s)
if (peekchar () == '#')
{
readchar ();
return cell_unspecified;
}
return reader_read_block_comment (s, readchar ());
}
struct scm *
reader_read_hash (int c, struct 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 == ':')
{
struct scm *x = reader_read_identifier_or_number (readchar ());
struct scm *msg = make_string0 ("keyword perifx ':' not followed by a symbol: ");
if (x->type == TNUMBER)
error (cell_symbol_system_error, cons (msg, 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);
}
struct scm *
reader_read_sexp (struct scm *c, struct scm *s, struct scm *a)
{
return reader_read_sexp_ (c->value, a);
}
struct 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 = c << 3;
c = c + readchar () - '0';
p = peekchar ();
}
}
else if (c == 'x' && ((p >= '0' && p <= '9') || (p >= 'a' && p <= 'f') || (p >= 'F' && p <= 'F')))
{
struct scm *n = reader_read_hex ();
c = n->value;
eputs ("reading hex c=");
eputs (itoa (c));
eputs ("\n");
}
else if (((c >= 'a' && c <= 'z') || c == '*') && ((p >= 'a' && p <= 'z') || p == '*'))
{
char *buf = __reader_read_char_buf;
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*") == 0)
c = EOF;
else if (strcmp (buf, "nul") == 0)
c = '\0';
else if (strcmp (buf, "alarm") == 0)
c = '\a';
else if (strcmp (buf, "backspace") == 0)
c = '\b';
else if (strcmp (buf, "tab") == 0)
c = '\t';
else if (strcmp (buf, "linefeed") == 0)
c = '\n';
else if (strcmp (buf, "newline") == 0)
c = '\n';
else if (strcmp (buf, "vtab") == 0)
c = '\v';
else if (strcmp (buf, "page") == 0)
c = '\f';
else if (strcmp (buf, "return") == 0)
/* Nyacc bug
c = '\r'; */
c = 13;
else if (strcmp (buf, "esc") == 0)
c = 27;
else if (strcmp (buf, "space") == 0)
c = ' ';
/* Nyacc uses old abbrevs */
else if (strcmp (buf, "bel") == 0)
c = '\a';
else if (strcmp (buf, "bs") == 0)
c = '\b';
else if (strcmp (buf, "ht") == 0)
c = '\t';
else if (strcmp (buf, "vt") == 0)
c = '\v';
else if (strcmp (buf, "cr") == 0)
/* Nyacc bug
c = '\r'; */
c = 13;
else
{
eputs ("char not supported: ");
eputs (buf);
eputs ("\n");
error (cell_symbol_system_error, make_string0 ("char not supported"));
}
}
return make_char (c);
}
struct 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 != 0)
n = 0 - n;
return make_number (n);
}
struct 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 != 0)
n = 0 - n;
return make_number (n);
}
struct 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 != 0)
n = 0 - n;
return make_number (n);
}
struct scm *
reader_read_string ()
{
size_t i = 0;
int c;
struct scm *n;
do
{
if (i > MAX_STRING)
assert_max_string (i, "reader_read_string", g_buf);
c = readchar ();
if (c == '"')
break;
if (c == '\\')
{
c = readchar ();
if (c == '\\' || c == '"')
0;
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')
{
n = reader_read_hex ();
c = n->value;
}
}
g_buf[i] = c;
i = i + 1;
}
while (1);
g_buf[i] = 0;
return make_string (g_buf, i);
}
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