-/* Copy into *YYMSG, which is of size *YYMSG_ALLOC, an error message
- about the unexpected token YYTOKEN for the state stack whose top is
- YYSSP.
-
- Return 0 if *YYMSG was successfully written. Return 1 if *YYMSG is
- not large enough to hold the message. In that case, also set
- *YYMSG_ALLOC to the required number of bytes. Return 2 if the
- required number of bytes is too large to store. */
-static int
-yysyntax_error (YYSIZE_T *yymsg_alloc, char **yymsg,
- yytype_int16 *yyssp, int yytoken)
-{
- YYSIZE_T yysize0 = yytnamerr (YY_NULL, yytname[yytoken]);
- YYSIZE_T yysize = yysize0;
- enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
- /* Internationalized format string. */
- const char *yyformat = YY_NULL;
- /* Arguments of yyformat. */
- char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];
- /* Number of reported tokens (one for the "unexpected", one per
- "expected"). */
- int yycount = 0;
-
- /* There are many possibilities here to consider:
- - Assume YYFAIL is not used. It's too flawed to consider. See
- <http://lists.gnu.org/archive/html/bison-patches/2009-12/msg00024.html>
- for details. YYERROR is fine as it does not invoke this
- function.
- - If this state is a consistent state with a default action, then
- the only way this function was invoked is if the default action
- is an error action. In that case, don't check for expected
- tokens because there are none.
- - The only way there can be no lookahead present (in yychar) is if
- this state is a consistent state with a default action. Thus,
- detecting the absence of a lookahead is sufficient to determine
- that there is no unexpected or expected token to report. In that
- case, just report a simple "syntax error".
- - Don't assume there isn't a lookahead just because this state is a
- consistent state with a default action. There might have been a
- previous inconsistent state, consistent state with a non-default
- action, or user semantic action that manipulated yychar.
- - Of course, the expected token list depends on states to have
- correct lookahead information, and it depends on the parser not
- to perform extra reductions after fetching a lookahead from the
- scanner and before detecting a syntax error. Thus, state merging
- (from LALR or IELR) and default reductions corrupt the expected
- token list. However, the list is correct for canonical LR with
- one exception: it will still contain any token that will not be
- accepted due to an error action in a later state.
- */
- if (yytoken != YYEMPTY)
- {
- int yyn = yypact[*yyssp];
- yyarg[yycount++] = yytname[yytoken];
- if (!yypact_value_is_default (yyn))
- {
- /* Start YYX at -YYN if negative to avoid negative indexes in
- YYCHECK. In other words, skip the first -YYN actions for
- this state because they are default actions. */
- int yyxbegin = yyn < 0 ? -yyn : 0;
- /* Stay within bounds of both yycheck and yytname. */
- int yychecklim = YYLAST - yyn + 1;
- int yyxend = yychecklim < YYNTOKENS ? yychecklim : YYNTOKENS;
- int yyx;
-
- for (yyx = yyxbegin; yyx < yyxend; ++yyx)
- if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR
- && !yytable_value_is_error (yytable[yyx + yyn]))
- {
- if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
- {
- yycount = 1;
- yysize = yysize0;
- break;
- }
- yyarg[yycount++] = yytname[yyx];
- {
- YYSIZE_T yysize1 = yysize + yytnamerr (YY_NULL, yytname[yyx]);
- if (! (yysize <= yysize1
- && yysize1 <= YYSTACK_ALLOC_MAXIMUM))
- return 2;
- yysize = yysize1;
- }
- }
- }
- }