extract_key.c revision 1.1.1.1 
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 */
16static KEY KEY_EXTRACT(__isl_keep isl_stream *s, struct isl_token *tok)
17{
18	isl_bool has_string;
19	char *name;
20	KEY key;
21	isl_ctx *ctx;
22
23	has_string = isl_token_has_str(tok);
24	if (has_string < 0)
25		return KEY_ERROR;
26	if (!has_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 (KEY_STR[key] && !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 */
52static KEY KEY_GET(__isl_keep isl_stream *s)
53{
54	struct isl_token *tok;
55	KEY key;
56
57	tok = isl_stream_next_token(s);
58	key = KEY_EXTRACT(s, tok);
59	isl_token_free(tok);
60
61	return key;
62}
63