git.gag.com Git - fw/altos/blob - src/scheme/ao_scheme_rep.c

   1 /*
   2  * Copyright © 2016 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  */
  14
  15 #include "ao_scheme.h"
  16
  17 ao_poly
  18 ao_scheme_read_eval_print(FILE *read_file, FILE *write_file, bool interactive)
  19 {
  20         ao_poly in, out = AO_SCHEME_NIL;
  21
  22         ao_scheme_exception = 0;
  23         for(;;) {
  24                 if (interactive)
  25                         fputs("> ", write_file);
  26                 in = ao_scheme_read(read_file);
  27                 if (in == _ao_scheme_atom_eof)
  28                         break;
  29                 out = ao_scheme_eval(in);
  30                 if (ao_scheme_exception) {
  31                         if (ao_scheme_exception & AO_SCHEME_EXIT)
  32                                 break;
  33                         ao_scheme_exception = 0;
  34                 } else {
  35                         if (write_file) {
  36                                 ao_scheme_poly_write(write_file, out, true);
  37                                 putc('\n', write_file);
  38                         }
  39                 }
  40         }
  41         return out;
  42 }