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news: update the yyreport_syntax_error example

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* examples/c/bistromathic/parse.y, tests/local.at
(yyreport_syntax_error): Fix use of YYSYMBOL_YYEMPTY.
* NEWS: Update.
This commit is contained in:
Akim Demaille
2020-04-04 19:35:33 +02:00
parent 4e3c06b0f8
commit 225a67321b
3 changed files with 27 additions and 15 deletions
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32
NEWS
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@@ -39,20 +39,30 @@ GNU Bison NEWS
int
yyreport_syntax_error (const yypcontext_t *ctx)
{
enum { ARGMAX = 10 };
int arg[ARGMAX];
int n = yy_syntax_error_arguments (ctx, arg, ARGMAX);
if (n == -2)
return 2; // Memory exhausted.
int res = 0;
YY_LOCATION_PRINT (stderr, *yypcontext_location (ctx));
fprintf (stderr, ": syntax error");
for (int i = 1; i < n; ++i)
fprintf (stderr, " %s %s",
i == 1 ? "expected" : "or", yysymbol_name (arg[i]));
if (n)
fprintf (stderr, " before %s", yysymbol_name (arg[0]));
// Report the tokens expected at this point.
{
enum { TOKENMAX = 10 };
yysymbol_type_t expected[TOKENMAX];
int n = yyexpected_tokens (ctx, expected, TOKENMAX);
if (n < 0)
// Forward errors to yyparse.
res = n;
else
for (int i = 0; i < n; ++i)
fprintf (stderr, "%s %s",
i == 0 ? ": expected" : " or", yysymbol_name (expected[i]));
}
// Report the unexpected token.
{
yysymbol_type_t lookahead = yypcontext_token (ctx);
if (lookahead != YYSYMBOL_YYEMPTY)
fprintf (stderr, " before %s", yysymbol_name (lookahead));
}
fprintf (stderr, "\n");
return 0;
return res;
}
**** Token aliases internationalization