contrib/libjeffpc/sexpr_impl.h

   1 /*
   2  * Copyright (c) 2016 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to deal
   6  * in the Software without restriction, including without limitation the rights
   7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8  * copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  20  * SOFTWARE.
  21  */
  22
  23 #ifndef __SEXPR_IMPL_H
  24 #define __SEXPR_IMPL_H
  25
  26 #include <jeffpc/sexpr.h>
  27 #include <jeffpc/int.h>
  28
  29 static inline bool sexpr_is_null(struct val *v)
  30 {
  31         return !v || (v->type == VT_CONS && !v->cons.head && !v->cons.tail);
  32 }
  33
  34 struct sexpr_parser_state {
  35         void *scanner;
  36         const char *input;
  37         size_t len;
  38         size_t pos;
  39         struct val *output;
  40         int lineno;
  41 };
  42
  43 extern int sexpr_reader_lex_destroy(void *yyscanner);
  44 extern int sexpr_reader_parse(struct sexpr_parser_state *data);
  45 extern void sexpr_reader_set_extra(void *user, void *yyscanner);
  46 extern int sexpr_reader_lex_init(void **scanner);
  47
  48 #endif