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771 lines
17 KiB
C
771 lines
17 KiB
C
/* json-node.c - JSON object model node
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*
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* This file is part of JSON-GLib
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* Copyright (C) 2007 OpenedHand Ltd.
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* Copyright (C) 2009 Intel Corp.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Author:
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* Emmanuele Bassi <ebassi@linux.intel.com>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <glib.h>
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#include "json-types-private.h"
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/*
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* SECTION:json-node
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* @short_description: Node in a JSON object model
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*
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* A #JsonNode is a generic container of elements inside a JSON stream.
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* It can contain fundamental types (integers, booleans, floating point
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* numbers, strings) and complex types (arrays and objects).
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*
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* When parsing a JSON data stream you extract the root node and walk
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* the node tree by retrieving the type of data contained inside the
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* node with the %JSON_NODE_TYPE macro. If the node contains a fundamental
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* type you can retrieve a copy of the #GValue holding it with the
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* json_node_get_value() function, and then use the #GValue API to extract
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* the data; if the node contains a complex type you can retrieve the
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* #JsonObject or the #JsonArray using json_node_get_object() or
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* json_node_get_array() respectively, and then retrieve the nodes
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* they contain.
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*/
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GType
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json_node_get_type (void)
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{
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static GType node_type = 0;
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if (G_UNLIKELY (node_type == 0))
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node_type = g_boxed_type_register_static (g_intern_static_string ("JsonNode"),
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(GBoxedCopyFunc) json_node_copy,
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(GBoxedFreeFunc) json_node_free);
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return node_type;
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}
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/*
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* json_node_get_value_type:
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* @node: a #JsonNode
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*
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* Returns the #GType of the payload of the node.
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*
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* Return value: a #GType for the payload.
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*
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* Since: 0.4
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*/
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GType
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json_node_get_value_type (JsonNode *node)
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{
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g_return_val_if_fail (node != NULL, G_TYPE_INVALID);
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switch (node->type)
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{
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case JSON_NODE_OBJECT:
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return JSON_TYPE_OBJECT;
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case JSON_NODE_ARRAY:
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return JSON_TYPE_ARRAY;
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case JSON_NODE_NULL:
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return G_TYPE_INVALID;
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case JSON_NODE_VALUE:
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return G_VALUE_TYPE (&(node->data.value));
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default:
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g_assert_not_reached ();
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return G_TYPE_INVALID;
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}
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}
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/*
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* json_node_new:
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* @type: a #JsonNodeType
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*
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* Creates a new #JsonNode of @type.
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*
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* Return value: the newly created #JsonNode
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*/
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JsonNode *
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json_node_new (JsonNodeType type)
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{
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JsonNode *data;
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g_return_val_if_fail (type >= JSON_NODE_OBJECT &&
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type <= JSON_NODE_NULL, NULL);
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data = g_slice_new0 (JsonNode);
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data->type = type;
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return data;
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}
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/*
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* json_node_copy:
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* @node: a #JsonNode
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*
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* Copies @node. If the node contains complex data types then the reference
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* count of the objects is increased.
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*
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* Return value: the copied #JsonNode
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*/
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JsonNode *
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json_node_copy (JsonNode *node)
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{
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JsonNode *copy;
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g_return_val_if_fail (node != NULL, NULL);
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copy = g_slice_new0 (JsonNode);
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copy->type = node->type;
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switch (copy->type)
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{
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case JSON_NODE_OBJECT:
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if (node->data.object)
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copy->data.object = json_object_ref (node->data.object);
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break;
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case JSON_NODE_ARRAY:
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if (node->data.array)
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copy->data.array = json_array_ref (node->data.array);
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break;
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case JSON_NODE_VALUE:
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if (G_VALUE_TYPE (&(node->data.value)) != G_TYPE_INVALID)
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{
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g_value_init (&(copy->data.value), G_VALUE_TYPE (&(node->data.value)));
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g_value_copy (&(node->data.value), &(copy->data.value));
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}
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break;
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case JSON_NODE_NULL:
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break;
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default:
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g_assert_not_reached ();
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}
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return copy;
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}
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/*
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* json_node_set_object:
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* @node: a #JsonNode
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* @object: a #JsonObject
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*
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* Sets @objects inside @node. The reference count of @object is increased.
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*/
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void
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json_node_set_object (JsonNode *node,
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JsonObject *object)
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{
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g_return_if_fail (node != NULL);
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g_return_if_fail (JSON_NODE_TYPE (node) == JSON_NODE_OBJECT);
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if (node->data.object)
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json_object_unref (node->data.object);
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if (object)
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node->data.object = json_object_ref (object);
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else
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node->data.object = NULL;
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}
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/*
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* json_node_take_object:
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* @node: a #JsonNode
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* @object: a #JsonObject
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*
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* Sets @object inside @node. The reference count of @object is not increased.
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*/
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void
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json_node_take_object (JsonNode *node,
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JsonObject *object)
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{
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g_return_if_fail (node != NULL);
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g_return_if_fail (JSON_NODE_TYPE (node) == JSON_NODE_OBJECT);
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if (node->data.object)
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{
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json_object_unref (node->data.object);
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node->data.object = NULL;
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}
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if (object)
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node->data.object = object;
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}
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/*
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* json_node_get_object:
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* @node: a #JsonNode
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*
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* Retrieves the #JsonObject stored inside a #JsonNode
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*
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* Return value: the #JsonObject
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*/
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JsonObject *
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json_node_get_object (JsonNode *node)
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{
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g_return_val_if_fail (node != NULL, NULL);
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g_return_val_if_fail (JSON_NODE_TYPE (node) == JSON_NODE_OBJECT, NULL);
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return node->data.object;
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}
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/*
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* json_node_dup_object:
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* @node: a #JsonNode
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*
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* Retrieves the #JsonObject inside @node. The reference count of
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* the returned object is increased.
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*
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* Return value: the #JsonObject
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*/
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JsonObject *
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json_node_dup_object (JsonNode *node)
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{
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g_return_val_if_fail (node != NULL, NULL);
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g_return_val_if_fail (JSON_NODE_TYPE (node) == JSON_NODE_OBJECT, NULL);
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if (node->data.object)
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return json_object_ref (node->data.object);
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return NULL;
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}
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/*
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* json_node_set_array:
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* @node: a #JsonNode
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* @array: a #JsonArray
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*
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* Sets @array inside @node and increases the #JsonArray reference count
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*/
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void
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json_node_set_array (JsonNode *node,
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JsonArray *array)
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{
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g_return_if_fail (node != NULL);
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g_return_if_fail (JSON_NODE_TYPE (node) == JSON_NODE_ARRAY);
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if (node->data.array)
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json_array_unref (node->data.array);
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if (array)
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node->data.array = json_array_ref (array);
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else
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node->data.array = NULL;
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}
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/*
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* json_node_take_array:
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* @node: a #JsonNode
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* @array: a #JsonArray
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*
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* Sets @array into @node without increasing the #JsonArray reference count.
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*/
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void
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json_node_take_array (JsonNode *node,
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JsonArray *array)
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{
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g_return_if_fail (node != NULL);
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g_return_if_fail (JSON_NODE_TYPE (node) == JSON_NODE_ARRAY);
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if (node->data.array)
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{
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json_array_unref (node->data.array);
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node->data.array = NULL;
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}
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if (array)
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node->data.array = array;
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}
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/*
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* json_node_get_array:
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* @node: a #JsonNode
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*
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* Retrieves the #JsonArray stored inside a #JsonNode
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*
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* Return value: the #JsonArray
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*/
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JsonArray *
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json_node_get_array (JsonNode *node)
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{
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g_return_val_if_fail (node != NULL, NULL);
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g_return_val_if_fail (JSON_NODE_TYPE (node) == JSON_NODE_ARRAY, NULL);
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return node->data.array;
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}
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/*
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* json_node_dup_array
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* @node: a #JsonNode
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*
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* Retrieves the #JsonArray stored inside a #JsonNode and returns it
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* with its reference count increased by one.
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*
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* Return value: the #JsonArray with its reference count increased.
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*/
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JsonArray *
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json_node_dup_array (JsonNode *node)
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{
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g_return_val_if_fail (node != NULL, NULL);
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g_return_val_if_fail (JSON_NODE_TYPE (node) == JSON_NODE_ARRAY, NULL);
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if (node->data.array)
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return json_array_ref (node->data.array);
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return NULL;
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}
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/*
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* json_node_get_value:
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* @node: a #JsonNode
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* @value: return location for an uninitialized value
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*
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* Retrieves a value from a #JsonNode and copies into @value. When done
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* using it, call g_value_unset() on the #GValue.
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*/
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void
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json_node_get_value (JsonNode *node,
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GValue *value)
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{
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g_return_if_fail (node != NULL);
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g_return_if_fail (JSON_NODE_TYPE (node) == JSON_NODE_VALUE);
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if (G_VALUE_TYPE (&(node->data.value)) != G_TYPE_INVALID)
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{
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g_value_init (value, G_VALUE_TYPE (&(node->data.value)));
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g_value_copy (&(node->data.value), value);
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}
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}
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static void inline
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node_value_unset (JsonNode *node)
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{
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if (G_VALUE_TYPE (&(node->data.value)) != G_TYPE_INVALID)
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g_value_unset (&(node->data.value));
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}
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/*
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* json_node_set_value:
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* @node: a #JsonNode
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* @value: the #GValue to set
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*
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* Sets @value inside @node. The passed #GValue is copied into the #JsonNode
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*/
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void
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json_node_set_value (JsonNode *node,
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const GValue *value)
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{
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g_return_if_fail (node != NULL);
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g_return_if_fail (JSON_NODE_TYPE (node) == JSON_NODE_VALUE);
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g_return_if_fail (G_VALUE_TYPE (value) != G_TYPE_INVALID);
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switch (G_VALUE_TYPE (value))
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{
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/* direct copy for the types we use */
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case G_TYPE_INT64:
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case G_TYPE_BOOLEAN:
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case G_TYPE_DOUBLE:
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case G_TYPE_STRING:
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node_value_unset (node);
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g_value_init (&(node->data.value), G_VALUE_TYPE (value));
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g_value_copy (value, &(node->data.value));
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break;
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/* auto-promote ints to long longs */
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case G_TYPE_INT:
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node_value_unset (node);
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g_value_init (&(node->data.value), G_TYPE_INT64);
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g_value_set_int64 (&(node->data.value),
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g_value_get_int (value));
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break;
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/* auto-promote single precision to double precision */
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case G_TYPE_FLOAT:
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node_value_unset (node);
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g_value_init (&(node->data.value), G_TYPE_DOUBLE);
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g_value_set_double (&(node->data.value),
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g_value_get_float (value));
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break;
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default:
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g_warning ("Invalid value of type '%s'",
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g_type_name (G_VALUE_TYPE (value)));
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return;
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}
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}
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/*
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* json_node_free:
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* @node: a #JsonNode
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*
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* Frees the resources allocated by @node.
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*/
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void
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json_node_free (JsonNode *node)
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{
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if (G_LIKELY (node))
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{
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switch (node->type)
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{
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case JSON_NODE_OBJECT:
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if (node->data.object)
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json_object_unref (node->data.object);
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break;
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case JSON_NODE_ARRAY:
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if (node->data.array)
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json_array_unref (node->data.array);
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break;
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case JSON_NODE_VALUE:
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g_value_unset (&(node->data.value));
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break;
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case JSON_NODE_NULL:
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break;
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}
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g_slice_free (JsonNode, node);
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}
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}
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/*
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* json_node_type_name:
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* @node: a #JsonNode
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*
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* Retrieves the user readable name of the data type contained by @node.
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*
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* Return value: a string containing the name of the type. The returned string
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* is owned by the node and should never be modified or freed
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*/
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G_CONST_RETURN gchar *
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json_node_type_name (JsonNode *node)
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{
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g_return_val_if_fail (node != NULL, "(null)");
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switch (node->type)
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{
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case JSON_NODE_OBJECT:
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return "JsonObject";
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case JSON_NODE_ARRAY:
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return "JsonArray";
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case JSON_NODE_NULL:
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return "NULL";
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case JSON_NODE_VALUE:
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return g_type_name (G_VALUE_TYPE (&(node->data.value)));
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}
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return "unknown";
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}
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/*
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* json_node_get_parent:
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* @node: a #JsonNode
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*
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* Retrieves the parent #JsonNode of @node.
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*
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* Return value: the parent node, or %NULL if @node is the root node
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*/
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JsonNode *
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json_node_get_parent (JsonNode *node)
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{
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g_return_val_if_fail (node != NULL, NULL);
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return node->parent;
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}
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/*
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* json_node_set_string:
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* @node: a #JsonNode of type %JSON_NODE_VALUE
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* @value: a string value
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*
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* Sets @value as the string content of the @node, replacing any existing
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* content.
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*/
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void
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json_node_set_string (JsonNode *node,
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const gchar *value)
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{
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g_return_if_fail (node != NULL);
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g_return_if_fail (JSON_NODE_TYPE (node) == JSON_NODE_VALUE);
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if (G_VALUE_TYPE (&(node->data.value)) == G_TYPE_STRING)
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g_value_set_string (&(node->data.value), value);
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else
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{
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GValue copy = { 0, };
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g_value_init (©, G_TYPE_STRING);
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g_value_set_string (©, value);
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json_node_set_value (node, ©);
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g_value_unset (©);
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}
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}
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/*
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* json_node_get_string:
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* @node: a #JsonNode of type %JSON_NODE_VALUE
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*
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* Gets the string value stored inside a #JsonNode
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*
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* Return value: a string value.
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*/
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G_CONST_RETURN gchar *
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json_node_get_string (JsonNode *node)
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{
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g_return_val_if_fail (node != NULL, NULL);
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if (JSON_NODE_TYPE (node) == JSON_NODE_NULL)
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return NULL;
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if (G_VALUE_TYPE (&(node->data.value)) == G_TYPE_STRING)
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return g_value_get_string (&(node->data.value));
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return NULL;
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}
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/*
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* json_node_dup_string:
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* @node: a #JsonNode of type %JSON_NODE_VALUE
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*
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* Gets a copy of the string value stored inside a #JsonNode
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*
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* Return value: a newly allocated string containing a copy of
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* the #JsonNode contents
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*/
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gchar *
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json_node_dup_string (JsonNode *node)
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{
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g_return_val_if_fail (node != NULL, NULL);
|
|
|
|
if (JSON_NODE_TYPE (node) == JSON_NODE_NULL)
|
|
return NULL;
|
|
|
|
if (G_VALUE_TYPE (&(node->data.value)) == G_TYPE_STRING)
|
|
return g_value_dup_string (&(node->data.value));
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* json_node_set_int:
|
|
* @node: a #JsonNode of type %JSON_NODE_VALUE
|
|
* @value: an integer value
|
|
*
|
|
* Sets @value as the integer content of the @node, replacing any existing
|
|
* content.
|
|
*/
|
|
void
|
|
json_node_set_int (JsonNode *node,
|
|
gint64 value)
|
|
{
|
|
g_return_if_fail (node != NULL);
|
|
g_return_if_fail (JSON_NODE_TYPE (node) == JSON_NODE_VALUE);
|
|
|
|
if (G_VALUE_TYPE (&(node->data.value)) == G_TYPE_INT64)
|
|
g_value_set_int64 (&(node->data.value), value);
|
|
else
|
|
{
|
|
GValue copy = { 0, };
|
|
|
|
g_value_init (©, G_TYPE_INT64);
|
|
g_value_set_int64 (©, value);
|
|
|
|
json_node_set_value (node, ©);
|
|
|
|
g_value_unset (©);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* json_node_get_int:
|
|
* @node: a #JsonNode of type %JSON_NODE_VALUE
|
|
*
|
|
* Gets the integer value stored inside a #JsonNode
|
|
*
|
|
* Return value: an integer value.
|
|
*/
|
|
gint64
|
|
json_node_get_int (JsonNode *node)
|
|
{
|
|
g_return_val_if_fail (node != NULL, 0);
|
|
|
|
if (JSON_NODE_TYPE (node) == JSON_NODE_NULL)
|
|
return 0;
|
|
|
|
if (G_VALUE_TYPE (&(node->data.value)) == G_TYPE_INT64)
|
|
return g_value_get_int64 (&(node->data.value));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* json_node_set_double:
|
|
* @node: a #JsonNode of type %JSON_NODE_VALUE
|
|
* @value: a double value
|
|
*
|
|
* Sets @value as the double content of the @node, replacing any existing
|
|
* content.
|
|
*/
|
|
void
|
|
json_node_set_double (JsonNode *node,
|
|
gdouble value)
|
|
{
|
|
g_return_if_fail (node != NULL);
|
|
g_return_if_fail (JSON_NODE_TYPE (node) == JSON_NODE_VALUE);
|
|
|
|
if (G_VALUE_TYPE (&(node->data.value)) == G_TYPE_DOUBLE)
|
|
g_value_set_double (&(node->data.value), value);
|
|
else
|
|
{
|
|
GValue copy = { 0, };
|
|
|
|
g_value_init (©, G_TYPE_DOUBLE);
|
|
g_value_set_double (©, value);
|
|
|
|
json_node_set_value (node, ©);
|
|
|
|
g_value_unset (©);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* json_node_get_double:
|
|
* @node: a #JsonNode of type %JSON_NODE_VALUE
|
|
*
|
|
* Gets the double value stored inside a #JsonNode
|
|
*
|
|
* Return value: a double value.
|
|
*/
|
|
gdouble
|
|
json_node_get_double (JsonNode *node)
|
|
{
|
|
g_return_val_if_fail (node != NULL, 0.0);
|
|
|
|
if (JSON_NODE_TYPE (node) == JSON_NODE_NULL)
|
|
return 0;
|
|
|
|
if (G_VALUE_TYPE (&(node->data.value)) == G_TYPE_DOUBLE)
|
|
return g_value_get_double (&(node->data.value));
|
|
|
|
return 0.0;
|
|
}
|
|
|
|
/*
|
|
* json_node_set_boolean:
|
|
* @node: a #JsonNode of type %JSON_NODE_VALUE
|
|
* @value: a boolean value
|
|
*
|
|
* Sets @value as the boolean content of the @node, replacing any existing
|
|
* content.
|
|
*/
|
|
void
|
|
json_node_set_boolean (JsonNode *node,
|
|
gboolean value)
|
|
{
|
|
g_return_if_fail (node != NULL);
|
|
g_return_if_fail (JSON_NODE_TYPE (node) == JSON_NODE_VALUE);
|
|
|
|
if (G_VALUE_TYPE (&(node->data.value)) == G_TYPE_BOOLEAN)
|
|
g_value_set_boolean (&(node->data.value), value);
|
|
else
|
|
{
|
|
GValue copy = { 0, };
|
|
|
|
g_value_init (©, G_TYPE_BOOLEAN);
|
|
g_value_set_boolean (©, value);
|
|
|
|
json_node_set_value (node, ©);
|
|
|
|
g_value_unset (©);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* json_node_get_boolean:
|
|
* @node: a #JsonNode of type %JSON_NODE_VALUE
|
|
*
|
|
* Gets the boolean value stored inside a #JsonNode
|
|
*
|
|
* Return value: a boolean value.
|
|
*/
|
|
gboolean
|
|
json_node_get_boolean (JsonNode *node)
|
|
{
|
|
g_return_val_if_fail (node != NULL, FALSE);
|
|
|
|
if (JSON_NODE_TYPE (node) == JSON_NODE_NULL)
|
|
return FALSE;
|
|
|
|
if (G_VALUE_TYPE (&(node->data.value)) == G_TYPE_BOOLEAN)
|
|
return g_value_get_boolean (&(node->data.value));
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/*
|
|
* json_node_get_node_type:
|
|
* @node: a #JsonNode
|
|
*
|
|
* Retrieves the #JsonNodeType of @node
|
|
*
|
|
* Return value: the type of the node
|
|
*
|
|
* Since: 0.8
|
|
*/
|
|
JsonNodeType
|
|
json_node_get_node_type (JsonNode *node)
|
|
{
|
|
g_return_val_if_fail (node != NULL, JSON_NODE_NULL);
|
|
|
|
return node->type;
|
|
}
|
|
|
|
/*
|
|
* json_node_is_null:
|
|
* @node: a #JsonNode
|
|
*
|
|
* Checks whether @node is a %JSON_NODE_NULL
|
|
*
|
|
* <note>A null node is not the same as a %NULL #JsonNode</note>
|
|
*
|
|
* Return value: %TRUE if the node is null
|
|
*
|
|
* Since: 0.8
|
|
*/
|
|
gboolean
|
|
json_node_is_null (JsonNode *node)
|
|
{
|
|
g_return_val_if_fail (node != NULL, TRUE);
|
|
|
|
return node->type == JSON_NODE_NULL;
|
|
}
|