extract_key.c

   1 /*
   2  * Copyright 2013      Ecole Normale Superieure
   3  *
   4  * Use of this software is governed by the MIT license
   5  *
   6  * Written by Sven Verdoolaege,
   7  * Ecole Normale Superieure, 45 rue d'Ulm, 75230 Paris, France
   8  */
   9
  10 #include <string.h>
  11
  12 /* Extract a mapping key from the token "tok".
  13  * Return KEY_ERROR on error, i.e., if "tok" does not
  14  * correspond to any known key.
  15  */
  16 static KEY extract_key(__isl_keep isl_stream *s, struct isl_token *tok)
  17 {
  18         int type;
  19         char *name;
  20         KEY key;
  21         isl_ctx *ctx;
  22
  23         if (!tok)
  24                 return KEY_ERROR;
  25         type = isl_token_get_type(tok);
  26         if (type != ISL_TOKEN_IDENT && type != ISL_TOKEN_STRING) {
  27                 isl_stream_error(s, tok, "expecting key");
  28                 return KEY_ERROR;
  29         }
  30
  31         ctx = isl_stream_get_ctx(s);
  32         name = isl_token_get_str(ctx, tok);
  33         if (!name)
  34                 return KEY_ERROR;
  35
  36         for (key = 0; key < KEY_END; ++key) {
  37                 if (!strcmp(name, key_str[key]))
  38                         break;
  39         }
  40         free(name);
  41
  42         if (key >= KEY_END)
  43                 isl_die(ctx, isl_error_invalid, "unknown key",
  44                         return KEY_ERROR);
  45         return key;
  46 }
  47
  48 /* Read a key from "s" and return the corresponding enum.
  49  * Return KEY_ERROR on error, i.e., if the first token
  50  * on the stream does not correspond to any known key.
  51  */
  52 static KEY get_key(__isl_keep isl_stream *s)
  53 {
  54         struct isl_token *tok;
  55         KEY key;
  56
  57         tok = isl_stream_next_token(s);
  58         key = extract_key(s, tok);
  59         isl_token_free(tok);
  60
  61         return key;
  62 }