[json-glib: 1/2] json-parser: Fix getting immutable root nodes from empty input
- From: Emmanuele Bassi <ebassi src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [json-glib: 1/2] json-parser: Fix getting immutable root nodes from empty input
- Date: Fri, 15 Dec 2017 16:45:47 +0000 (UTC)
commit ef5707cd0b8d1a1a4ab4edf9ae58c7b3176ef93b
Author: Philip Withnall <withnall endlessm com>
Date: Fri Dec 15 16:10:47 2017 +0000
json-parser: Fix getting immutable root nodes from empty input
If parsing an empty document, it’s allowed to return NULL from
json_parser_get_root(). This was broken for immutable parsers when
immutability support was added (an assertion fails). Fix that, and also
document that json_parser_get_root() may return NULL.
Do the same for json_parser_steal_root() too, which is another way that
the root node may be NULL.
Add a unit test.
Signed-off-by: Philip Withnall <withnall endlessm com>
json-glib/json-parser.c | 19 ++++++++++++++-----
json-glib/tests/parser.c | 22 +++++++++++++++++-----
2 files changed, 31 insertions(+), 10 deletions(-)
---
diff --git a/json-glib/json-parser.c b/json-glib/json-parser.c
index bdb7123..0f87ba4 100644
--- a/json-glib/json-parser.c
+++ b/json-glib/json-parser.c
@@ -1179,9 +1179,11 @@ json_parser_load_from_data (JsonParser *parser,
* json_parser_get_root:
* @parser: a #JsonParser
*
- * Retrieves the top level node from the parsed JSON stream.
+ * Retrieves the top level node from the parsed JSON stream. If the parser input
+ * was an empty string, or if parsing failed, this will be %NULL. It will also
+ * be %NULL if it has been stolen using json_parser_steal_root().
*
- * Return value: (transfer none): the root #JsonNode . The returned
+ * Return value: (transfer none) (nullable): the root #JsonNode . The returned
* node is owned by the #JsonParser and should never be modified
* or freed.
*/
@@ -1191,7 +1193,8 @@ json_parser_get_root (JsonParser *parser)
g_return_val_if_fail (JSON_IS_PARSER (parser), NULL);
/* Sanity check. */
- g_return_val_if_fail (!parser->priv->is_immutable ||
+ g_return_val_if_fail (parser->priv->root == NULL ||
+ !parser->priv->is_immutable ||
json_node_is_immutable (parser->priv->root), NULL);
return parser->priv->root;
@@ -1201,9 +1204,10 @@ json_parser_get_root (JsonParser *parser)
* json_parser_steal_root:
* @parser: a #JsonParser
*
- * Steals the top level node from the parsed JSON stream.
+ * Steals the top level node from the parsed JSON stream. This will be %NULL
+ * in the same situations as json_parser_get_root() returns %NULL.
*
- * Returns: (transfer full): the top level #JsonNode
+ * Returns: (transfer full) (nullable): the top level #JsonNode
*
* Since: 1.4
*/
@@ -1214,6 +1218,11 @@ json_parser_steal_root (JsonParser *parser)
g_return_val_if_fail (JSON_IS_PARSER (parser), NULL);
+ /* Sanity check. */
+ g_return_val_if_fail (parser->priv->root == NULL ||
+ !parser->priv->is_immutable ||
+ json_node_is_immutable (parser->priv->root), NULL);
+
return g_steal_pointer (&priv->root);
}
diff --git a/json-glib/tests/parser.c b/json-glib/tests/parser.c
index 8c52a1d..7af4329 100644
--- a/json-glib/tests/parser.c
+++ b/json-glib/tests/parser.c
@@ -144,14 +144,10 @@ static guint n_test_assignments = G_N_ELEMENTS (test_assignments);
static guint n_test_unicode = G_N_ELEMENTS (test_unicode);
static void
-test_empty (void)
+test_empty_with_parser (JsonParser *parser)
{
- JsonParser *parser;
GError *error = NULL;
- parser = json_parser_new ();
- g_assert (JSON_IS_PARSER (parser));
-
if (g_test_verbose ())
g_print ("checking json_parser_load_from_data with empty string...\n");
@@ -170,7 +166,23 @@ test_empty (void)
g_assert (NULL == json_parser_get_root (parser));
}
+}
+
+static void
+test_empty (void)
+{
+ JsonParser *parser;
+
+ /* Check with and without immutability enabled, as there have been bugs with
+ * NULL root nodes on immutable parsers. */
+ parser = json_parser_new ();
+ g_assert (JSON_IS_PARSER (parser));
+ test_empty_with_parser (parser);
+ g_object_unref (parser);
+ parser = json_parser_new_immutable ();
+ g_assert (JSON_IS_PARSER (parser));
+ test_empty_with_parser (parser);
g_object_unref (parser);
}
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