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Fix wrong "void value expression" error

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* parse.y (value_expr_check): if either of `then` or `else`
  statements is not a void value expression, the whole `if` is not
  also a void value expression.  [Bug #15932]
This commit is contained in:
Nobuyoshi Nakada 2019-06-17 21:36:41 +09:00
parent 09a846085c
commit 01b3a38043
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GPG key ID: 4BC7D6DF58D8DF60
2 changed files with 28 additions and 12 deletions
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34
parse.y
View file

@ -10521,10 +10521,10 @@ node_assign(struct parser_params *p, NODE *lhs, NODE *rhs, const YYLTYPE *loc)
return lhs;
}
static int
value_expr_gen(struct parser_params *p, NODE *node)
static NODE *
value_expr_check(struct parser_params *p, NODE *node)
{
int cond = 0;
NODE *void_node = 0, *vn;
if (!node) {
rb_warning0("empty expression");
@ -10536,9 +10536,7 @@ value_expr_gen(struct parser_params *p, NODE *node)
case NODE_NEXT:
case NODE_REDO:
case NODE_RETRY:
if (!cond) yyerror1(&node->nd_loc, "void value expression");
/* or "control never reach"? */
return FALSE;
return void_node ? void_node : node;
case NODE_BLOCK:
while (node->nd_next) {
@ -10561,14 +10559,15 @@ value_expr_gen(struct parser_params *p, NODE *node)
node = node->nd_body;
break;
}
if (!value_expr(node->nd_body)) return FALSE;
vn = value_expr_check(p, node->nd_body);
if (!vn) return NULL;
if (!void_node) void_node = vn;
node = node->nd_else;
break;
case NODE_AND:
case NODE_OR:
cond = 1;
node = node->nd_2nd;
node = node->nd_1st;
break;
case NODE_LASGN:
@ -10576,16 +10575,27 @@ value_expr_gen(struct parser_params *p, NODE *node)
case NODE_DASGN_CURR:
case NODE_MASGN:
mark_lvar_used(p, node);
return TRUE;
return NULL;
default:
return TRUE;
return NULL;
}
}
return TRUE;
return NULL;
}
static int
value_expr_gen(struct parser_params *p, NODE *node)
{
NODE *void_node = value_expr_check(p, node);
if (void_node) {
yyerror1(&void_node->nd_loc, "void value expression");
/* or "control never reach"? */
return FALSE;
}
return TRUE;
}
static void
void_expr(struct parser_params *p, NODE *node)
{

6
test/ruby/test_syntax.rb
View file

@ -1388,6 +1388,12 @@ eom
assert_syntax_error('a|>-b', /unexpected '-'/)
end
def test_value_expr_in_condition
mesg = /void value expression/
assert_syntax_error("tap {a = (true ? next : break)}", mesg)
assert_valid_syntax("tap {a = (true ? true : break)}")
end
private
def not_label(x) @result = x; @not_label ||= nil end