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%nterm: do not accept numbers nor string alias

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Reported by Rici Lake.
http://lists.gnu.org/archive/html/bug-bison/2018-10/msg00000.html

* src/parse-gram.y (symbol_def): Refuse string aliases and numbers
for non-terminals.
(prologue_declaration): Recover from errors ended with ';'.
* tests/input.at (Invalid %nterm uses): New.
This commit is contained in:
Akim Demaille
2018-11-25 14:01:10 +01:00
parent 4ad877fdab
commit 4bddd33439
2 changed files with 64 additions and 1 deletions
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23
src/parse-gram.y
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@@ -317,6 +317,7 @@ prologue_declaration:
| "%token-table" { token_table_flag = true; }
| "%verbose" { report_flag |= report_states; }
| "%yacc" { yacc_flag = true; }
| error ";" { current_class = unknown_sym; yyerrok; }
| /*FIXME: Err? What is this horror doing here? */ ";"
;
@@ -495,7 +496,7 @@ tag:
| "<>" { $$ = uniqstr_new (""); }
;
/* One token definition. */
/* One symbol (token or nterm depending on current_class) definition. */
symbol_def:
TAG
{
@@ -509,18 +510,38 @@ symbol_def:
}
| id INT
{
if (current_class != token_sym)
{
gram_error (&@2,
_("non-terminals cannot be given an explicit number"));
YYERROR;
}
symbol_class_set ($1, current_class, @1, true);
symbol_type_set ($1, current_type, @1);
symbol_user_token_number_set ($1, $2, @2);
}
| id string_as_id
{
if (current_class != token_sym)
{
gram_error (&@2,
_("non-terminals cannot be given a string alias"));
YYERROR;
}
symbol_class_set ($1, current_class, @1, true);
symbol_type_set ($1, current_type, @1);
symbol_make_alias ($1, $2, @$);
}
| id INT string_as_id
{
if (current_class != token_sym)
{
gram_error (&@2,
_("non-terminals cannot be given an explicit number"));
gram_error (&@3,
_("non-terminals cannot be given a string alias"));
YYERROR;
}
symbol_class_set ($1, current_class, @1, true);
symbol_type_set ($1, current_type, @1);
symbol_user_token_number_set ($1, $2, @2);