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mutter/clutter/clutter-script.c
Emmanuele Bassi abc529aaec 2007-10-12 Emmanuele Bassi <ebassi@openedhand.com> 
* clutter/clutter-script.c (construct_timline),
	(parse_member_to_property): Transfer ownership of the
	implicit timelines to the behaviour, so that they get
	unreferenced when the behaviour is destroyed.

	(parse_member_to_property): Reverse the list of children
	and behaviours.
2007-10-12 09:43:27 +00:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:clutter-script
* @short_description: Loads a scene from UI definition data
*
* #ClutterScript is an object used for loading and building parts or a
* complete scenegraph from external definition data in forms of string
* buffers or files.
*
* The UI definition format is JSON, the JavaScript Object Notation as
* described by RFC 4627. #ClutterScript can load a JSON data stream,
* parse it and build all the objects defined into it. Each object must
* have an "id" and a "type" properties defining the name to be used
* to retrieve it from #ClutterScript with clutter_script_get_object(),
* and the class type to be instanciated. Every other attribute will
* be mapped to the class properties.
*
* A simple object might be defined as:
*
* <programlisting>
* {
* "id" : "red-button",
* "type" : "ClutterRectangle",
* "width" : 100,
* "height" : 100,
* "color" : "0xff0000ff"
* }
* </programlisting>
*
* This will produce a red #ClutterRectangle, 100x100 pixels wide, and
* with a name of "red-button"; it can be retrieved by calling:
*
* <programlisting>
* ClutterActor *red_button;
*
* red_button = CLUTTER_ACTOR (clutter_script_get_object (script, "red-button"));
* </programlisting>
*
* and then manipulated with the Clutter API.
*
* Packing can be represented using the "children" member, and passing an
* array of objects or ids of objects already defined (but not packed: the
* packing rules of Clutter still apply).
*
* Behaviours and timelines can also be defined inside a UI definition
* buffer:
*
* <programlisting>
* {
* "id" : "rotate-behaviour",
* "type" : "ClutterBehaviourRotate",
* "angle-begin" : 0.0,
* "angle-end" : 360.0,
* "axis" : "z-axis",
* "alpha" : {
* "timeline" : { "num-frames" : 240, "fps" : 60, "loop" : true },
* "function" : "sine"
* }
* }
* </programlisting>
*
* And then to apply a defined behaviour to an actor defined inside the
* definition of an actor, the "behaviour" member can be used:
*
* <programlisting>
* {
* "id" : "my-rotating-actor",
* "type" : "ClutterTexture",
* ...
* "behaviours" : [ "rotate-behaviour" ]
* }
* </programlisting>
*
* Clutter reserves the following names, so classes defining properties
* through the usual GObject registration process should avoid using these
* names to avoid collisions:
*
* <programlisting><![CDATA[
* "id" := the unique name of a ClutterScript object
* "type" := the class literal name, also used to infer the type function
* "type_func" := the GType function name, for non-standard classes
* "children" := an array of names or objects to add as children
* "behaviours" := an array of names or objects to apply to an actor
* ]]></programlisting>
*
* #ClutterScript is available since Clutter 0.6
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <glib.h>
#include <glib-object.h>
#include "clutter-actor.h"
#include "clutter-alpha.h"
#include "clutter-behaviour.h"
#include "clutter-container.h"
#include "clutter-stage.h"
#include "clutter-script.h"
#include "clutter-script-private.h"
#include "clutter-private.h"
#include "clutter-debug.h"
#include "json/json-parser.h"
#define CLUTTER_SCRIPT_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_SCRIPT, ClutterScriptPrivate))
struct _ClutterScriptPrivate
{
GHashTable *objects;
guint last_merge_id;
JsonParser *parser;
gchar *filename;
guint is_filename : 1;
};
G_DEFINE_TYPE (ClutterScript, clutter_script, G_TYPE_OBJECT);
static void object_info_free (gpointer data);
static GType
resolve_type (const gchar *symbol)
{
static GModule *module = NULL;
GTypeGetFunc func;
GType gtype = G_TYPE_INVALID;
if (!module)
module = g_module_open (NULL, 0);
if (g_module_symbol (module, symbol, (gpointer)&func))
gtype = func ();
return gtype;
}
/* tries to map a name in camel case into the corresponding get_type()
* function, e.g.:
*
* ClutterRectangle -> clutter_rectangle_get_type
* ClutterCloneTexture -> clutter_clone_texture_get_type
*
* taken from GTK+, gtkbuilder.c
*/
static GType
resolve_type_lazily (const gchar *name)
{
static GModule *module = NULL;
GTypeGetFunc func;
GString *symbol_name = g_string_new ("");
char c, *symbol;
int i;
GType gtype = G_TYPE_INVALID;
if (!module)
module = g_module_open (NULL, 0);
for (i = 0; name[i] != '\0'; i++)
{
c = name[i];
/* skip if uppercase, first or previous is uppercase */
if ((c == g_ascii_toupper (c) &&
i > 0 && name[i-1] != g_ascii_toupper (name[i-1])) ||
(i > 2 && name[i] == g_ascii_toupper (name[i]) &&
name[i-1] == g_ascii_toupper (name[i-1]) &&
name[i-2] == g_ascii_toupper (name[i-2])))
g_string_append_c (symbol_name, '_');
g_string_append_c (symbol_name, g_ascii_tolower (c));
}
g_string_append (symbol_name, "_get_type");
symbol = g_string_free (symbol_name, FALSE);
if (g_module_symbol (module, symbol, (gpointer)&func))
gtype = func ();
g_free (symbol);
return gtype;
}
static ClutterAlphaFunc
resolve_alpha_func (const gchar *name)
{
static GModule *module = NULL;
ClutterAlphaFunc func;
GString *symbol_name = g_string_new ("");
char c, *symbol;
int i;
if (!module)
module = g_module_open (NULL, 0);
CLUTTER_NOTE (SCRIPT, "Looking for `%s' alpha function", name);
if (g_module_symbol (module, name, (gpointer) &func))
return func;
g_string_append (symbol_name, "clutter_");
for (i = 0; name[i] != '\0'; i++)
{
c = name[i];
if (name[i] == '-')
g_string_append_c (symbol_name, '_');
else
g_string_append_c (symbol_name, g_ascii_tolower (name[i]));
}
g_string_append (symbol_name, "_func");
symbol = g_string_free (symbol_name, FALSE);
CLUTTER_NOTE (SCRIPT, "Looking for `%s' alpha function", symbol);
if (!g_module_symbol (module, symbol, (gpointer)&func))
func = NULL;
g_free (symbol);
return func;
}
static void
warn_missing_attribute (ClutterScript *script,
const gchar *id,
const gchar *attribute)
{
ClutterScriptPrivate *priv = script->priv;
if (G_LIKELY (id))
{
g_warning ("%s: %d: object `%s' has no `%s' attribute",
priv->is_filename ? priv->filename : "<input>",
json_parser_get_current_line (priv->parser),
id,
attribute);
}
else
{
g_warning ("%s: %d: object has no `%s' attribute",
priv->is_filename ? priv->filename : "<input>",
json_parser_get_current_line (priv->parser),
attribute);
}
}
static void
warn_invalid_value (ClutterScript *script,
const gchar *attribute,
JsonNode *node)
{
ClutterScriptPrivate *priv = script->priv;
if (G_LIKELY (node))
{
g_warning ("%s: %d: invalid value of type `%s' for attribute `%s'",
priv->is_filename ? priv->filename : "<input>",
json_parser_get_current_line (priv->parser),
json_node_type_name (node),
attribute);
}
else
{
g_warning ("%s: %d: invalid value for attribute `%s'",
priv->is_filename ? priv->filename : "<input>",
json_parser_get_current_line (priv->parser),
attribute);
}
}
static ClutterTimeline *
construct_timeline (ClutterScript *script,
JsonObject *object)
{
ClutterTimeline *retval = NULL;
ObjectInfo *oinfo;
GList *members, *l;
/* we fake an ObjectInfo so we can reuse clutter_script_construct_object()
* here; we do not save it inside the hash table, because if this had
* been a named object then we wouldn't have ended up here in the first
* place
*/
oinfo = g_slice_new0 (ObjectInfo);
oinfo->gtype = CLUTTER_TYPE_TIMELINE;
members = json_object_get_members (object);
for (l = members; l != NULL; l = l->next)
{
const gchar *name = l->data;
JsonNode *node = json_object_get_member (object, name);
if (JSON_NODE_TYPE (node) == JSON_NODE_VALUE)
{
PropertyInfo *pinfo = g_slice_new (PropertyInfo);
GValue value = { 0, };
pinfo->property_name = g_strdup (name);
json_node_get_value (node, &value);
g_value_init (&pinfo->value, G_VALUE_TYPE (&value));
g_value_transform (&value, &pinfo->value);
g_value_unset (&value);
oinfo->properties = g_list_prepend (oinfo->properties, pinfo);
}
}
g_list_free (members);
retval = CLUTTER_TIMELINE (clutter_script_construct_object (script, oinfo));
/* we transfer ownership to the alpha function later */
oinfo->is_toplevel = FALSE;
object_info_free (oinfo);
return retval;
}
static const gchar *
get_id_from_node (JsonNode *node)
{
JsonObject *object;
switch (JSON_NODE_TYPE (node))
{
case JSON_NODE_OBJECT:
object = json_node_get_object (node);
if (json_object_has_member (object, "id"))
{
JsonNode *id = json_object_get_member (object, "id");
return json_node_get_string (id);
}
break;
case JSON_NODE_VALUE:
return json_node_get_string (node);
default:
break;
}
return NULL;
}
static ClutterUnit
get_units_from_node (JsonNode *node)
{
ClutterUnit retval = 0;
GValue value = { 0, };
if (JSON_NODE_TYPE (node) != JSON_NODE_VALUE)
return 0;
json_node_get_value (node, &value);
switch (G_VALUE_TYPE (&value))
{
case G_TYPE_INT:
retval = CLUTTER_UNITS_FROM_INT (g_value_get_int (&value));
break;
default:
break;
}
return retval;
}
static PropertyInfo *
parse_member_to_property (ClutterScript *script,
ObjectInfo *info,
const gchar *name,
JsonNode *node)
{
PropertyInfo *retval = NULL;
GValue value = { 0, };
switch (JSON_NODE_TYPE (node))
{
case JSON_NODE_VALUE:
retval = g_slice_new (PropertyInfo);
retval->property_name = g_strdup (name);
json_node_get_value (node, &value);
g_value_init (&retval->value, G_VALUE_TYPE (&value));
g_value_transform (&value, &retval->value);
g_value_unset (&value);
break;
case JSON_NODE_OBJECT:
if (strcmp (name, "alpha") == 0)
{
JsonObject *object = json_node_get_object (node);
ClutterAlpha *alpha = NULL;
ClutterTimeline *timeline = NULL;
ClutterAlphaFunc func = NULL;
JsonNode *val;
gboolean unref_timeline = FALSE;
retval = g_slice_new (PropertyInfo);
retval->property_name = g_strdup (name);
alpha = clutter_alpha_new ();
val = json_object_get_member (object, "timeline");
if (val)
{
if (JSON_NODE_TYPE (val) == JSON_NODE_VALUE &&
json_node_get_string (val) != NULL)
{
const gchar *id = json_node_get_string (val);
timeline =
CLUTTER_TIMELINE (clutter_script_get_object (script, id));
}
else if (JSON_NODE_TYPE (val) == JSON_NODE_OBJECT)
{
timeline = construct_timeline (script, json_node_get_object (val));
unref_timeline = TRUE;
}
}
val = json_object_get_member (object, "function");
if (val && json_node_get_string (val) != NULL)
func = resolve_alpha_func (json_node_get_string (val));
alpha = g_object_new (CLUTTER_TYPE_ALPHA, NULL);
clutter_alpha_set_func (alpha, func, NULL, NULL);
clutter_alpha_set_timeline (alpha, timeline);
if (unref_timeline)
g_object_unref (timeline);
g_value_init (&retval->value, CLUTTER_TYPE_ALPHA);
g_value_set_object (&retval->value, G_OBJECT (alpha));
}
break;
case JSON_NODE_ARRAY:
if (strcmp (name, "margin") == 0)
{
JsonArray *array = json_node_get_array (node);
JsonNode *val;
gint array_len, i;
ClutterMargin margin = { 0, };
array_len = json_array_get_length (array);
for (i = 0; i < array_len; i++)
{
ClutterUnit units;
val = json_array_get_element (array, i);
units = get_units_from_node (val);
switch (i)
{
case 0:
margin.top = units;
margin.right = margin.top;
margin.bottom = margin.top;
margin.left = margin.top;
break;
case 1:
margin.right = margin.left = units;
break;
case 2:
margin.bottom = units;
break;
case 3:
margin.left = units;
break;
}
}
retval = g_slice_new (PropertyInfo);
retval->property_name = g_strdup (name);
g_value_init (&retval->value, CLUTTER_TYPE_MARGIN);
g_value_set_boxed (&retval->value, &margin);
}
else if (strcmp (name, "padding") == 0)
{
JsonArray *array = json_node_get_array (node);
JsonNode *val;
gint array_len, i;
ClutterPadding padding = { 0, };
array_len = json_array_get_length (array);
for (i = 0; i < array_len; i++)
{
ClutterUnit units;
val = json_array_get_element (array, i);
units = get_units_from_node (val);
switch (i)
{
case 0:
padding.top = units;
padding.right = padding.top;
padding.bottom = padding.top;
padding.left = padding.top;
break;
case 1:
padding.right = padding.left = units;
break;
case 2:
padding.bottom = units;
break;
case 3:
padding.left = units;
break;
}
}
retval = g_slice_new (PropertyInfo);
retval->property_name = g_strdup (name);
g_value_init (&retval->value, CLUTTER_TYPE_PADDING);
g_value_set_boxed (&retval->value, &padding);
}
else if (strcmp (name, "clip") == 0)
{
JsonArray *array = json_node_get_array (node);
JsonNode *val;
gint i;
ClutterGeometry geom = { 0, };
/* this is quite evil indeed */
for (i = 0; i < json_array_get_length (array); i++)
{
val = json_array_get_element (array, i);
switch (i)
{
case 0: geom.x = json_node_get_int (val); break;
case 1: geom.y = json_node_get_int (val); break;
case 2: geom.width = json_node_get_int (val); break;
case 3: geom.height = json_node_get_int (val); break;
}
}
retval = g_slice_new (PropertyInfo);
retval->property_name = g_strdup (name);
g_value_init (&retval->value, CLUTTER_TYPE_GEOMETRY);
g_value_set_boxed (&retval->value, &geom);
}
else if ((strcmp (name, "children") == 0) ||
(strcmp (name, "behaviours") == 0))
{
JsonArray *array = json_node_get_array (node);
JsonNode *val;
gint i, array_len;
GList *children;
children = NULL;
array_len = json_array_get_length (array);
for (i = 0; i < array_len; i++)
{
const gchar *id;
val = json_array_get_element (array, i);
id = get_id_from_node (val);
if (id)
children = g_list_prepend (children, g_strdup (id));
else
warn_invalid_value (script, "id", val);
}
if (name[0] == 'c') /* children */
info->children = g_list_reverse (children);
else
info->behaviours = g_list_reverse (children);
}
break;
case JSON_NODE_NULL:
break;
}
return retval;
}
static void
json_object_end (JsonParser *parser,
JsonObject *object,
gpointer user_data)
{
ClutterScript *script = user_data;
ClutterScriptPrivate *priv = script->priv;
ObjectInfo *oinfo;
JsonNode *val;
GList *members, *l;
/* ignore any non-named object */
if (!json_object_has_member (object, "id"))
return;
if (!json_object_has_member (object, "type"))
{
val = json_object_get_member (object, "id");
warn_missing_attribute (script, json_node_get_string (val), "type");
return;
}
oinfo = g_slice_new0 (ObjectInfo);
val = json_object_get_member (object, "id");
oinfo->id = json_node_dup_string (val);
val = json_object_get_member (object, "type");
oinfo->class_name = json_node_dup_string (val);
if (json_object_has_member (object, "type_func"))
{
/* remove "type_func", as it's not usef by anything else */
val = json_object_get_member (object, "type_func");
oinfo->type_func = json_node_dup_string (val);
json_object_remove_member (object, "type_func");
}
oinfo->is_toplevel = FALSE;
members = json_object_get_members (object);
for (l = members; l; l = l->next)
{
const gchar *name = l->data;
PropertyInfo *pinfo;
if (strcmp (name, "id") == 0 || strcmp (name, "type") == 0)
continue;
val = json_object_get_member (object, name);
pinfo = parse_member_to_property (script, oinfo, name, val);
if (!pinfo)
continue;
oinfo->properties = g_list_prepend (oinfo->properties, pinfo);
CLUTTER_NOTE (SCRIPT, "Added property `%s' (type:%s) for class `%s'",
pinfo->property_name,
g_type_name (G_VALUE_TYPE (&pinfo->value)),
oinfo->class_name);
}
g_list_free (members);
CLUTTER_NOTE (SCRIPT, "Added object `%s' (type:%s) with %d properties",
oinfo->id,
oinfo->class_name,
g_list_length (oinfo->properties));
g_hash_table_replace (priv->objects, g_strdup (oinfo->id), oinfo);
}
/* the property translation sequence is split in two: the first
* half is done in parse_member_to_property(), which translates
* from JSON data types into valid property types. the second
* half is done here, where property types are translated into
* the correct type for the given property GType
*/
static gboolean
translate_property (ClutterScript *script,
GType gtype,
const gchar *name,
const GValue *src,
GValue *dest)
{
gboolean retval = FALSE;
/* colors have a parse function, so we can pass it the
* string we get from the parser
*/
if (strcmp (name, "color") == 0)
{
ClutterColor color = { 0, };
const gchar *color_str;
if (G_VALUE_HOLDS (src, G_TYPE_STRING))
{
color_str = g_value_get_string (src);
clutter_color_parse (color_str, &color);
}
g_value_init (dest, CLUTTER_TYPE_COLOR);
g_value_set_boxed (dest, &color);
return TRUE;
}
/* pixbufs are specified using the path to the file name; the
* path can be absolute or relative to the current directory.
* we need to load the pixbuf from the file and print a
* warning here in case it didn't work.
*/
if (strcmp (name, "pixbuf") == 0)
{
GdkPixbuf *pixbuf = NULL;
const gchar *string;
gchar *path;
GError *error;
if (G_VALUE_HOLDS (src, G_TYPE_STRING))
string = g_value_get_string (src);
else
return FALSE;
if (g_path_is_absolute (string))
path = g_strdup (string);
else
{
if (script->priv->is_filename)
{
gchar *dirname;
dirname = g_path_get_dirname (script->priv->filename);
path = g_build_filename (dirname, string, NULL);
g_free (dirname);
}
else
{
gchar *dirname;
dirname = g_get_current_dir ();
path = g_build_filename (dirname, string, NULL);
g_free (dirname);
}
}
error = NULL;
pixbuf = gdk_pixbuf_new_from_file (path, &error);
if (error)
{
g_warning ("Unable to open pixbuf at path `%s': %s",
path,
error->message);
g_error_free (error);
g_free (path);
return FALSE;
}
CLUTTER_NOTE (SCRIPT, "Setting pixbuf [%p] from file `%s'",
pixbuf,
path);
g_free (path);
g_value_init (dest, GDK_TYPE_PIXBUF);
g_value_set_object (dest, pixbuf);
return TRUE;
}
CLUTTER_NOTE (SCRIPT, "Copying property `%s' to type `%s'",
name,
g_type_name (gtype));
/* fall back scenario */
g_value_init (dest, gtype);
switch (G_TYPE_FUNDAMENTAL (gtype))
{
case G_TYPE_ULONG:
g_value_set_ulong (dest, (gulong) g_value_get_int (src));
break;
case G_TYPE_UINT:
g_value_set_uint (dest, (guint) g_value_get_int (src));
retval = TRUE;
break;
case G_TYPE_UCHAR:
g_value_set_uchar (dest, (guchar) g_value_get_int (src));
retval = TRUE;
break;
case G_TYPE_ENUM:
case G_TYPE_FLAGS:
{
gint value;
if (G_VALUE_HOLDS (src, G_TYPE_STRING))
{
const gchar *string = g_value_get_string (src);
if (G_TYPE_FUNDAMENTAL (gtype) == G_TYPE_ENUM)
retval = clutter_script_enum_from_string (gtype, string, &value);
else
retval = clutter_script_flags_from_string (gtype, string, &value);
}
else if (G_VALUE_HOLDS (src, G_TYPE_INT))
{
value = g_value_get_int (src);
}
if (retval)
{
if (G_TYPE_FUNDAMENTAL (gtype) == G_TYPE_ENUM)
g_value_set_enum (dest, value);
else
g_value_set_flags (dest, value);
}
}
break;
default:
g_value_copy (src, dest);
retval = TRUE;
break;
}
return retval;
}
/* translates the PropertyInfo structure into a GParameter array to
* be fed to g_object_newv()
*/
static void
translate_properties (ClutterScript *script,
ObjectInfo *oinfo,
guint *n_params,
GParameter **params)
{
GList *l;
GParamSpec *pspec;
GObjectClass *oclass;
GArray *parameters;
oclass = g_type_class_ref (oinfo->gtype);
g_assert (oclass != NULL);
parameters = g_array_new (FALSE, FALSE, sizeof (GParameter));
for (l = oinfo->properties; l; l = l->next)
{
PropertyInfo *pinfo = l->data;
GParameter param = { NULL };
pspec = g_object_class_find_property (oclass, pinfo->property_name);
if (!pspec)
{
g_warning ("Unknown property `%s' for class `%s'",
pinfo->property_name,
g_type_name (oinfo->gtype));
continue;
}
param.name = pinfo->property_name;
if (!translate_property (script, G_PARAM_SPEC_VALUE_TYPE (pspec),
param.name,
&pinfo->value,
&param.value))
{
g_warning ("Unable to set property `%s' for class `%s'",
pinfo->property_name,
g_type_name (oinfo->gtype));
continue;
}
g_array_append_val (parameters, param);
}
*n_params = parameters->len;
*params = (GParameter *) g_array_free (parameters, FALSE);
g_type_class_unref (oclass);
}
static void
apply_behaviours (ClutterScript *script,
ClutterActor *actor,
GList *behaviours)
{
GObject *object;
GList *l;
for (l = behaviours; l != NULL; l = l->next)
{
const gchar *name = l->data;
object = clutter_script_get_object (script, name);
if (!object)
{
ObjectInfo *oinfo;
oinfo = g_hash_table_lookup (script->priv->objects, name);
if (oinfo)
object = clutter_script_construct_object (script, oinfo);
else
continue;
}
CLUTTER_NOTE (SCRIPT, "Applying behaviour `%s' to actor of type `%s'",
name,
g_type_name (G_OBJECT_TYPE (actor)));
clutter_behaviour_apply (CLUTTER_BEHAVIOUR (object), actor);
}
}
static void
add_children (ClutterScript *script,
ClutterContainer *container,
GList *children)
{
GObject *object;
GList *l;
for (l = children; l != NULL; l = l->next)
{
const gchar *name = l->data;
object = clutter_script_get_object (script, name);
if (!object)
{
ObjectInfo *oinfo;
oinfo = g_hash_table_lookup (script->priv->objects, name);
if (oinfo)
object = clutter_script_construct_object (script, oinfo);
else
continue;
}
CLUTTER_NOTE (SCRIPT, "Adding children `%s' to actor of type `%s'",
name,
g_type_name (G_OBJECT_TYPE (container)));
clutter_container_add_actor (container, CLUTTER_ACTOR (object));
}
}
static GObject *
construct_stage (ClutterScript *script,
ObjectInfo *oinfo)
{
GObjectClass *oclass = g_type_class_ref (CLUTTER_TYPE_STAGE);
GList *l;
if (oinfo->object)
return oinfo->object;
oinfo->object = G_OBJECT (clutter_stage_get_default ());
for (l = oinfo->properties; l; l = l->next)
{
PropertyInfo *pinfo = l->data;
const gchar *name = pinfo->property_name;
GParamSpec *pspec;
GValue value = { 0, };
pspec = g_object_class_find_property (oclass, name);
if (!pspec)
{
g_warning ("Unknown property `%s' for class `ClutterStage'",
name);
continue;
}
if (!translate_property (script, G_PARAM_SPEC_VALUE_TYPE (pspec),
name,
&pinfo->value,
&value))
{
g_warning ("Unable to set property `%s' for class `%s'",
pinfo->property_name,
g_type_name (oinfo->gtype));
continue;
}
g_object_set_property (oinfo->object, name, &value);
g_value_unset (&value);
}
g_type_class_unref (oclass);
if (oinfo->children)
{
/* we know ClutterStage is a ClutterContainer */
add_children (script,
CLUTTER_CONTAINER (oinfo->object),
oinfo->children);
}
g_object_set_data_full (oinfo->object, "clutter-script-name",
g_strdup (oinfo->id),
g_free);
return oinfo->object;
}
GObject *
clutter_script_construct_object (ClutterScript *script,
ObjectInfo *oinfo)
{
guint n_params, i;
GParameter *params;
if (oinfo->object)
return oinfo->object;
if (oinfo->gtype == G_TYPE_INVALID)
{
if (oinfo->type_func)
oinfo->gtype = resolve_type (oinfo->type_func);
else
oinfo->gtype = resolve_type_lazily (oinfo->class_name);
if (oinfo->gtype == G_TYPE_INVALID)
return NULL;
}
/* the stage is a special case: it's a singleton, it cannot
* be created by the user and it's owned by the backend. hence,
* we cannot follow the usual pattern here
*/
if (g_type_is_a (oinfo->gtype, CLUTTER_TYPE_STAGE))
return construct_stage (script, oinfo);
params = NULL;
translate_properties (script, oinfo, &n_params, &params);
CLUTTER_NOTE (SCRIPT, "Creating instance for type `%s' (params:%d)",
g_type_name (oinfo->gtype),
n_params);
oinfo->object = g_object_newv (oinfo->gtype, n_params, params);
for (i = 0; i < n_params; i++)
{
GParameter param = params[i];
g_value_unset (&param.value);
}
g_free (params);
if (CLUTTER_IS_CONTAINER (oinfo->object) && oinfo->children)
add_children (script, CLUTTER_CONTAINER (oinfo->object), oinfo->children);
if (CLUTTER_IS_ACTOR (oinfo->object) && oinfo->behaviours)
apply_behaviours (script, CLUTTER_ACTOR (oinfo->object), oinfo->behaviours);
if (CLUTTER_IS_BEHAVIOUR (oinfo->object) ||
CLUTTER_IS_TIMELINE (oinfo->object))
oinfo->is_toplevel = TRUE;
if (oinfo->id)
g_object_set_data_full (oinfo->object, "clutter-script-name",
g_strdup (oinfo->id),
g_free);
return oinfo->object;
}
static void
for_each_object (gpointer key,
gpointer value,
gpointer data)
{
ClutterScript *script = data;
ObjectInfo *oinfo = value;
clutter_script_construct_object (script, oinfo);
}
static void
json_parse_end (JsonParser *parser,
gpointer user_data)
{
ClutterScript *script = user_data;
ClutterScriptPrivate *priv = script->priv;
g_hash_table_foreach (priv->objects, for_each_object, script);
}
static void
object_info_free (gpointer data)
{
if (G_LIKELY (data))
{
ObjectInfo *oinfo = data;
GList *l;
g_free (oinfo->id);
g_free (oinfo->class_name);
g_free (oinfo->type_func);
for (l = oinfo->properties; l; l = l->next)
{
PropertyInfo *pinfo = l->data;
g_free (pinfo->property_name);
g_value_unset (&pinfo->value);
}
g_list_free (oinfo->properties);
/* these are ids */
g_list_foreach (oinfo->children, (GFunc) g_free, NULL);
g_list_free (oinfo->children);
g_list_foreach (oinfo->behaviours, (GFunc) g_free, NULL);
g_list_free (oinfo->behaviours);
if (oinfo->is_toplevel && oinfo->object)
g_object_unref (oinfo->object);
g_slice_free (ObjectInfo, oinfo);
}
}
static void
clutter_script_finalize (GObject *gobject)
{
ClutterScriptPrivate *priv = CLUTTER_SCRIPT_GET_PRIVATE (gobject);
g_object_unref (priv->parser);
g_hash_table_destroy (priv->objects);
g_free (priv->filename);
G_OBJECT_CLASS (clutter_script_parent_class)->finalize (gobject);
}
static void
clutter_script_class_init (ClutterScriptClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (ClutterScriptPrivate));
gobject_class->finalize = clutter_script_finalize;
}
static void
clutter_script_init (ClutterScript *script)
{
ClutterScriptPrivate *priv;
script->priv = priv = CLUTTER_SCRIPT_GET_PRIVATE (script);
priv->parser = json_parser_new ();
g_signal_connect (priv->parser,
"object-end", G_CALLBACK (json_object_end),
script);
g_signal_connect (priv->parser,
"parse-end", G_CALLBACK (json_parse_end),
script);
priv->is_filename = FALSE;
priv->last_merge_id = 0;
priv->objects = g_hash_table_new_full (g_str_hash, g_str_equal,
g_free,
object_info_free);
}
/**
* clutter_script_new:
*
* Creates a new #ClutterScript instance. #ClutterScript can be used
* to load objects definitions for scenegraph elements, like actors,
* or behavioural elements, like behaviours and timelines. The
* definitions must be encoded using the JavaScript Object Notation (JSON)
* language.
*
* Return value: the newly created #ClutterScript instance. Use
* g_object_unref() when done.
*
* Since: 0.6
*/
ClutterScript *
clutter_script_new (void)
{
return g_object_new (CLUTTER_TYPE_SCRIPT, NULL);
}
/**
* clutter_script_load_from_file:
* @script: a #ClutterScript
* @filename: the full path to the definition file
* @error: return location for a #GError, or %NULL
*
* Loads the definitions from @filename into @script and merges with
* the currently loaded ones, if any.
*
* Return value: on error, zero is returned and @error is set
* accordingly. On success, a positive integer is returned.
*
* Since: 0.6
*/
guint
clutter_script_load_from_file (ClutterScript *script,
const gchar *filename,
GError **error)
{
ClutterScriptPrivate *priv;
GError *internal_error;
g_return_val_if_fail (CLUTTER_IS_SCRIPT (script), 0);
g_return_val_if_fail (filename != NULL, 0);
priv = script->priv;
g_free (priv->filename);
priv->filename = g_strdup (filename);
priv->is_filename = TRUE;
internal_error = NULL;
json_parser_load_from_file (priv->parser, filename, &internal_error);
if (internal_error)
{
g_propagate_error (error, internal_error);
return 0;
}
else
priv->last_merge_id += 1;
return priv->last_merge_id;
}
/**
* clutter_script_load_from_data:
* @script: a #ClutterScript
* @data: a buffer containing the definitions
* @length: the length of the buffer, or -1 if @data is a NUL-terminated
* buffer
* @error: return location for a #GError, or %NULL
*
* Loads the definitions from @data into @script and merges with
* the currently loaded ones, if any.
*
* Return value: on error, zero is returned and @error is set
* accordingly. On success, a positive integer is returned.
*
* Since: 0.6
*/
guint
clutter_script_load_from_data (ClutterScript *script,
const gchar *data,
gsize length,
GError **error)
{
ClutterScriptPrivate *priv;
GError *internal_error;
g_return_val_if_fail (CLUTTER_IS_SCRIPT (script), 0);
g_return_val_if_fail (data != NULL, 0);
priv = script->priv;
g_free (priv->filename);
priv->filename = NULL;
priv->is_filename = FALSE;
internal_error = NULL;
json_parser_load_from_data (priv->parser, data, length, &internal_error);
if (internal_error)
{
g_propagate_error (error, internal_error);
return 0;
}
else
priv->last_merge_id += 1;
return priv->last_merge_id;
}
/**
* clutter_script_get_object:
* @script: a #ClutterScript
* @name: the name of the object to retrieve
*
* Retrieves the object bound to @name. This function does not increment
* the reference count of the returned object.
*
* Return value: the named object, or %NULL if no object with the
* given name was available
*
* Since: 0.6
*/
GObject *
clutter_script_get_object (ClutterScript *script,
const gchar *name)
{
ObjectInfo *oinfo;
g_return_val_if_fail (CLUTTER_IS_SCRIPT (script), NULL);
g_return_val_if_fail (name != NULL, NULL);
oinfo = g_hash_table_lookup (script->priv->objects, name);
if (!oinfo)
return NULL;
return clutter_script_construct_object (script, oinfo);
}
static GList *
clutter_script_get_objects_valist (ClutterScript *script,
const gchar *first_name,
va_list args)
{
GList *retval = NULL;
const gchar *name;
name = first_name;
while (name)
{
retval =
g_list_prepend (retval, clutter_script_get_object (script, name));
name = va_arg (args, gchar*);
}
return g_list_reverse (retval);
}
/**
* clutter_script_get_objects:
* @script: a #ClutterScript
* @first_name: the name of the first object to retrieve
* @Varargs: a %NULL-terminated list of names
*
* Retrieves a list of objects for the given names. This function does
* not increment the reference count of the returned objects.
*
* Return value: a newly allocated #GList containing the found objects,
* or %NULL. Use g_list_free() when done using it.
*
* Since: 0.6
*/
GList *
clutter_script_get_objects (ClutterScript *script,
const gchar *first_name,
...)
{
GList *retval = NULL;
va_list var_args;
g_return_val_if_fail (CLUTTER_IS_SCRIPT (script), NULL);
g_return_val_if_fail (first_name != NULL, NULL);
va_start (var_args, first_name);
retval = clutter_script_get_objects_valist (script, first_name, var_args);
va_end (var_args);
return retval;
}
gboolean
clutter_script_enum_from_string (GType type,
const gchar *string,
gint *enum_value)
{
GEnumClass *eclass;
GEnumValue *ev;
gchar *endptr;
gint value;
gboolean retval = TRUE;
g_return_val_if_fail (G_TYPE_IS_ENUM (type), 0);
g_return_val_if_fail (string != NULL, 0);
value = strtoul (string, &endptr, 0);
if (endptr != string) /* parsed a number */
*enum_value = value;
else
{
eclass = g_type_class_ref (type);
ev = g_enum_get_value_by_name (eclass, string);
if (!ev)
ev = g_enum_get_value_by_nick (eclass, string);
if (ev)
*enum_value = ev->value;
else
retval = FALSE;
g_type_class_unref (eclass);
}
return retval;
}
gboolean
clutter_script_flags_from_string (GType type,
const gchar *string,
gint *flags_value)
{
GFlagsClass *fclass;
gchar *endptr, *prevptr;
guint i, j, ret, value;
gchar *flagstr;
GFlagsValue *fv;
const gchar *flag;
gunichar ch;
gboolean eos;
g_return_val_if_fail (G_TYPE_IS_FLAGS (type), 0);
g_return_val_if_fail (string != 0, 0);
ret = TRUE;
value = strtoul (string, &endptr, 0);
if (endptr != string) /* parsed a number */
*flags_value = value;
else
{
fclass = g_type_class_ref (type);
flagstr = g_strdup (string);
for (value = i = j = 0; ; i++)
{
eos = flagstr[i] == '\0';
if (!eos && flagstr[i] != '|')
continue;
flag = &flagstr[j];
endptr = &flagstr[i];
if (!eos)
{
flagstr[i++] = '\0';
j = i;
}
/* trim spaces */
for (;;)
{
ch = g_utf8_get_char (flag);
if (!g_unichar_isspace (ch))
break;
flag = g_utf8_next_char (flag);
}
while (endptr > flag)
{
prevptr = g_utf8_prev_char (endptr);
ch = g_utf8_get_char (prevptr);
if (!g_unichar_isspace (ch))
break;
endptr = prevptr;
}
if (endptr > flag)
{
*endptr = '\0';
fv = g_flags_get_value_by_name (fclass, flag);
if (!fv)
fv = g_flags_get_value_by_nick (fclass, flag);
if (fv)
value |= fv->value;
else
{
ret = FALSE;
break;
}
}
if (eos)
{
*flags_value = value;
break;
}
}
g_free (flagstr);
g_type_class_unref (fclass);
}
return ret;
}
gboolean
clutter_script_value_from_data (ClutterScript *script,
GType gtype,
const gchar *data,
GValue *value,
GError **error)
{
return FALSE;
}
GQuark
clutter_script_error_quark (void)
{
return g_quark_from_static_string ("clutter-script-error");
}
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