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glib/gobject/gparam.c

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/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 1997-1999, 2000-2001 Tim Janik and Red Hat, Inc.
*
* 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.
*/
/*
* MT safe
*/
#include "config.h"
#include <string.h>
#include "gparam.h"
#include "gparamspecs.h"
#include "gvaluecollector.h"
#include "gtype-private.h"
/**
* SECTION:gparamspec
* @short_description: Metadata for parameter specifications
* @see_also: g_object_class_install_property(), g_object_set(),
* g_object_get(), g_object_set_property(), g_object_get_property(),
* g_value_register_transform_func()
* @title: GParamSpec
*
* #GParamSpec is an object structure that encapsulates the metadata
* required to specify parameters, such as e.g. #GObject properties.
*
* <para id="canonical-parameter-name">
* Parameter names need to start with a letter (a-z or A-Z). Subsequent
* characters can be letters, numbers or a '-'.
* All other characters are replaced by a '-' during construction.
* The result of this replacement is called the canonical name of the
* parameter.
* </para>
*/
/* --- defines --- */
#define PARAM_FLOATING_FLAG 0x2
#define G_PARAM_USER_MASK (~0 << G_PARAM_USER_SHIFT)
#define PSPEC_APPLIES_TO_VALUE(pspec, value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_PARAM_SPEC_VALUE_TYPE (pspec)))
/* --- prototypes --- */
static void g_param_spec_class_base_init (GParamSpecClass *class);
static void g_param_spec_class_base_finalize (GParamSpecClass *class);
static void g_param_spec_class_init (GParamSpecClass *class,
gpointer class_data);
static void g_param_spec_init (GParamSpec *pspec,
GParamSpecClass *class);
static void g_param_spec_finalize (GParamSpec *pspec);
static void value_param_init (GValue *value);
static void value_param_free_value (GValue *value);
static void value_param_copy_value (const GValue *src_value,
GValue *dest_value);
static void value_param_transform_value (const GValue *src_value,
GValue *dest_value);
static gpointer value_param_peek_pointer (const GValue *value);
static gchar* value_param_collect_value (GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags);
static gchar* value_param_lcopy_value (const GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags);
typedef struct
{
GValue default_value;
} GParamSpecPrivate;
static gint g_param_private_offset;
/* --- functions --- */
static inline GParamSpecPrivate *
g_param_spec_get_private (GParamSpec *pspec)
{
return &G_STRUCT_MEMBER (GParamSpecPrivate, pspec, g_param_private_offset);
}
void
_g_param_type_init (void)
{
static const GTypeFundamentalInfo finfo = {
(G_TYPE_FLAG_CLASSED |
G_TYPE_FLAG_INSTANTIATABLE |
G_TYPE_FLAG_DERIVABLE |
G_TYPE_FLAG_DEEP_DERIVABLE),
};
static const GTypeValueTable param_value_table = {
value_param_init, /* value_init */
value_param_free_value, /* value_free */
value_param_copy_value, /* value_copy */
value_param_peek_pointer, /* value_peek_pointer */
"p", /* collect_format */
value_param_collect_value, /* collect_value */
"p", /* lcopy_format */
value_param_lcopy_value, /* lcopy_value */
};
const GTypeInfo param_spec_info = {
sizeof (GParamSpecClass),
(GBaseInitFunc) g_param_spec_class_base_init,
(GBaseFinalizeFunc) g_param_spec_class_base_finalize,
(GClassInitFunc) g_param_spec_class_init,
(GClassFinalizeFunc) NULL,
NULL, /* class_data */
sizeof (GParamSpec),
0, /* n_preallocs */
(GInstanceInitFunc) g_param_spec_init,
&param_value_table,
};
GType type;
/* This should be registered as GParamSpec instead of GParam, for
* consistency sake, so that type name can be mapped to struct name,
* However, some language bindings, most noticeable the python ones
* depends on the "GParam" identifier, see #548689
*/
type = g_type_register_fundamental (G_TYPE_PARAM, g_intern_static_string ("GParam"), &param_spec_info, &finfo, G_TYPE_FLAG_ABSTRACT);
g_assert (type == G_TYPE_PARAM);
g_param_private_offset = g_type_add_instance_private (type, sizeof (GParamSpecPrivate));
g_value_register_transform_func (G_TYPE_PARAM, G_TYPE_PARAM, value_param_transform_value);
}
static void
g_param_spec_class_base_init (GParamSpecClass *class)
{
}
static void
g_param_spec_class_base_finalize (GParamSpecClass *class)
{
}
static void
g_param_spec_class_init (GParamSpecClass *class,
gpointer class_data)
{
class->value_type = G_TYPE_NONE;
class->finalize = g_param_spec_finalize;
class->value_set_default = NULL;
class->value_validate = NULL;
class->values_cmp = NULL;
g_type_class_adjust_private_offset (class, &g_param_private_offset);
}
static void
g_param_spec_init (GParamSpec *pspec,
GParamSpecClass *class)
{
pspec->name = NULL;
pspec->_nick = NULL;
pspec->_blurb = NULL;
pspec->flags = 0;
pspec->value_type = class->value_type;
pspec->owner_type = 0;
pspec->qdata = NULL;
g_datalist_set_flags (&pspec->qdata, PARAM_FLOATING_FLAG);
pspec->ref_count = 1;
pspec->param_id = 0;
}
static void
g_param_spec_finalize (GParamSpec *pspec)
{
GParamSpecPrivate *priv = g_param_spec_get_private (pspec);
if (priv->default_value.g_type)
g_value_reset (&priv->default_value);
g_datalist_clear (&pspec->qdata);
if (!(pspec->flags & G_PARAM_STATIC_NICK))
g_free (pspec->_nick);
if (!(pspec->flags & G_PARAM_STATIC_BLURB))
g_free (pspec->_blurb);
g_type_free_instance ((GTypeInstance*) pspec);
}
/**
* g_param_spec_ref: (skip)
* @pspec: a valid #GParamSpec
*
* Increments the reference count of @pspec.
*
* Returns: the #GParamSpec that was passed into this function
*/
GParamSpec*
g_param_spec_ref (GParamSpec *pspec)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
g_atomic_int_inc ((int *)&pspec->ref_count);
return pspec;
}
/**
* g_param_spec_unref: (skip)
* @pspec: a valid #GParamSpec
*
* Decrements the reference count of a @pspec.
*/
void
g_param_spec_unref (GParamSpec *pspec)
{
gboolean is_zero;
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
is_zero = g_atomic_int_dec_and_test ((int *)&pspec->ref_count);
if (G_UNLIKELY (is_zero))
{
G_PARAM_SPEC_GET_CLASS (pspec)->finalize (pspec);
}
}
/**
* g_param_spec_sink:
* @pspec: a valid #GParamSpec
*
* The initial reference count of a newly created #GParamSpec is 1,
* even though no one has explicitly called g_param_spec_ref() on it
* yet. So the initial reference count is flagged as "floating", until
* someone calls <literal>g_param_spec_ref (pspec); g_param_spec_sink
* (pspec);</literal> in sequence on it, taking over the initial
* reference count (thus ending up with a @pspec that has a reference
* count of 1 still, but is not flagged "floating" anymore).
*/
void
g_param_spec_sink (GParamSpec *pspec)
{
gsize oldvalue;
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
oldvalue = g_atomic_pointer_and (&pspec->qdata, ~(gsize)PARAM_FLOATING_FLAG);
if (oldvalue & PARAM_FLOATING_FLAG)
g_param_spec_unref (pspec);
}
/**
* g_param_spec_ref_sink: (skip)
* @pspec: a valid #GParamSpec
*
* Convenience function to ref and sink a #GParamSpec.
*
* Since: 2.10
* Returns: the #GParamSpec that was passed into this function
*/
GParamSpec*
g_param_spec_ref_sink (GParamSpec *pspec)
{
gsize oldvalue;
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
oldvalue = g_atomic_pointer_and (&pspec->qdata, ~(gsize)PARAM_FLOATING_FLAG);
if (!(oldvalue & PARAM_FLOATING_FLAG))
g_param_spec_ref (pspec);
return pspec;
}
/**
* g_param_spec_get_name:
* @pspec: a valid #GParamSpec
*
* Get the name of a #GParamSpec.
*
* The name is always an "interned" string (as per g_intern_string()).
* This allows for pointer-value comparisons.
*
* Returns: the name of @pspec.
*/
const gchar *
g_param_spec_get_name (GParamSpec *pspec)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
return pspec->name;
}
/**
* g_param_spec_get_nick:
* @pspec: a valid #GParamSpec
*
* Get the nickname of a #GParamSpec.
*
* Returns: the nickname of @pspec.
*/
const gchar *
g_param_spec_get_nick (GParamSpec *pspec)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
if (pspec->_nick)
return pspec->_nick;
else
{
GParamSpec *redirect_target;
redirect_target = g_param_spec_get_redirect_target (pspec);
if (redirect_target && redirect_target->_nick)
return redirect_target->_nick;
}
return pspec->name;
}
/**
* g_param_spec_get_blurb:
* @pspec: a valid #GParamSpec
*
* Get the short description of a #GParamSpec.
*
* Returns: the short description of @pspec.
*/
const gchar *
g_param_spec_get_blurb (GParamSpec *pspec)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
if (pspec->_blurb)
return pspec->_blurb;
else
{
GParamSpec *redirect_target;
redirect_target = g_param_spec_get_redirect_target (pspec);
if (redirect_target && redirect_target->_blurb)
return redirect_target->_blurb;
}
return NULL;
}
static void
canonicalize_key (gchar *key)
{
gchar *p;
for (p = key; *p != 0; p++)
{
gchar c = *p;
if (c != '-' &&
(c < '0' || c > '9') &&
(c < 'A' || c > 'Z') &&
(c < 'a' || c > 'z'))
*p = '-';
}
}
static gboolean
is_canonical (const gchar *key)
{
const gchar *p;
for (p = key; *p != 0; p++)
{
gchar c = *p;
if (c != '-' &&
(c < '0' || c > '9') &&
(c < 'A' || c > 'Z') &&
(c < 'a' || c > 'z'))
return FALSE;
}
return TRUE;
}
/**
* g_param_spec_internal: (skip)
* @param_type: the #GType for the property; must be derived from #G_TYPE_PARAM
* @name: the canonical name of the property
* @nick: the nickname of the property
* @blurb: a short description of the property
* @flags: a combination of #GParamFlags
*
* Creates a new #GParamSpec instance.
*
* A property name consists of segments consisting of ASCII letters and
* digits, separated by either the '-' or '_' character. The first
* character of a property name must be a letter. Names which violate these
* rules lead to undefined behaviour.
*
* When creating and looking up a #GParamSpec, either separator can be
* used, but they cannot be mixed. Using '-' is considerably more
* efficient and in fact required when using property names as detail
* strings for signals.
*
* Beyond the name, #GParamSpec<!-- -->s have two more descriptive
* strings associated with them, the @nick, which should be suitable
* for use as a label for the property in a property editor, and the
* @blurb, which should be a somewhat longer description, suitable for
* e.g. a tooltip. The @nick and @blurb should ideally be localized.
*
* Returns: a newly allocated #GParamSpec instance
*/
gpointer
g_param_spec_internal (GType param_type,
const gchar *name,
const gchar *nick,
const gchar *blurb,
GParamFlags flags)
{
GParamSpec *pspec;
g_return_val_if_fail (G_TYPE_IS_PARAM (param_type) && param_type != G_TYPE_PARAM, NULL);
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail ((name[0] >= 'A' && name[0] <= 'Z') || (name[0] >= 'a' && name[0] <= 'z'), NULL);
g_return_val_if_fail (!(flags & G_PARAM_STATIC_NAME) || is_canonical (name), NULL);
pspec = (gpointer) g_type_create_instance (param_type);
if (flags & G_PARAM_STATIC_NAME)
{
/* pspec->name is not freed if (flags & G_PARAM_STATIC_NAME) */
pspec->name = (gchar *) g_intern_static_string (name);
if (!is_canonical (pspec->name))
g_warning ("G_PARAM_STATIC_NAME used with non-canonical pspec name: %s", pspec->name);
}
else
{
if (is_canonical (name))
pspec->name = (gchar *) g_intern_string (name);
else
{
gchar *tmp = g_strdup (name);
canonicalize_key (tmp);
pspec->name = (gchar *) g_intern_string (tmp);
g_free (tmp);
}
}
if (flags & G_PARAM_STATIC_NICK)
pspec->_nick = (gchar*) nick;
else
pspec->_nick = g_strdup (nick);
if (flags & G_PARAM_STATIC_BLURB)
pspec->_blurb = (gchar*) blurb;
else
pspec->_blurb = g_strdup (blurb);
pspec->flags = (flags & G_PARAM_USER_MASK) | (flags & G_PARAM_MASK);
return pspec;
}
/**
* g_param_spec_get_qdata:
* @pspec: a valid #GParamSpec
* @quark: a #GQuark, naming the user data pointer
*
* Gets back user data pointers stored via g_param_spec_set_qdata().
*
* Returns: (transfer none): the user data pointer set, or %NULL
*/
gpointer
g_param_spec_get_qdata (GParamSpec *pspec,
GQuark quark)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
return quark ? g_datalist_id_get_data (&pspec->qdata, quark) : NULL;
}
/**
* g_param_spec_set_qdata:
* @pspec: the #GParamSpec to set store a user data pointer
* @quark: a #GQuark, naming the user data pointer
* @data: an opaque user data pointer
*
* Sets an opaque, named pointer on a #GParamSpec. The name is
* specified through a #GQuark (retrieved e.g. via
* g_quark_from_static_string()), and the pointer can be gotten back
* from the @pspec with g_param_spec_get_qdata(). Setting a
* previously set user data pointer, overrides (frees) the old pointer
* set, using %NULL as pointer essentially removes the data stored.
*/
void
g_param_spec_set_qdata (GParamSpec *pspec,
GQuark quark,
gpointer data)
{
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
g_return_if_fail (quark > 0);
g_datalist_id_set_data (&pspec->qdata, quark, data);
}
/**
* g_param_spec_set_qdata_full: (skip)
* @pspec: the #GParamSpec to set store a user data pointer
* @quark: a #GQuark, naming the user data pointer
* @data: an opaque user data pointer
* @destroy: function to invoke with @data as argument, when @data needs to
* be freed
*
* This function works like g_param_spec_set_qdata(), but in addition,
* a <literal>void (*destroy) (gpointer)</literal> function may be
* specified which is called with @data as argument when the @pspec is
* finalized, or the data is being overwritten by a call to
* g_param_spec_set_qdata() with the same @quark.
*/
void
g_param_spec_set_qdata_full (GParamSpec *pspec,
GQuark quark,
gpointer data,
GDestroyNotify destroy)
{
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
g_return_if_fail (quark > 0);
g_datalist_id_set_data_full (&pspec->qdata, quark, data, data ? destroy : (GDestroyNotify) NULL);
}
/**
* g_param_spec_steal_qdata:
* @pspec: the #GParamSpec to get a stored user data pointer from
* @quark: a #GQuark, naming the user data pointer
*
* Gets back user data pointers stored via g_param_spec_set_qdata()
* and removes the @data from @pspec without invoking its destroy()
* function (if any was set). Usually, calling this function is only
* required to update user data pointers with a destroy notifier.
*
* Returns: (transfer none): the user data pointer set, or %NULL
*/
gpointer
g_param_spec_steal_qdata (GParamSpec *pspec,
GQuark quark)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
g_return_val_if_fail (quark > 0, NULL);
return g_datalist_id_remove_no_notify (&pspec->qdata, quark);
}
/**
* g_param_spec_get_redirect_target:
* @pspec: a #GParamSpec
*
* If the paramspec redirects operations to another paramspec,
* returns that paramspec. Redirect is used typically for
* providing a new implementation of a property in a derived
* type while preserving all the properties from the parent
* type. Redirection is established by creating a property
* of type #GParamSpecOverride. See g_object_class_override_property()
* for an example of the use of this capability.
*
* Since: 2.4
*
* Returns: (transfer none): paramspec to which requests on this
* paramspec should be redirected, or %NULL if none.
*/
GParamSpec*
g_param_spec_get_redirect_target (GParamSpec *pspec)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
if (G_IS_PARAM_SPEC_OVERRIDE (pspec))
{
GParamSpecOverride *ospec = G_PARAM_SPEC_OVERRIDE (pspec);
return ospec->overridden;
}
else
return NULL;
}
/**
* g_param_value_set_default:
* @pspec: a valid #GParamSpec
* @value: a #GValue of correct type for @pspec
*
* Sets @value to its default value as specified in @pspec.
*/
void
g_param_value_set_default (GParamSpec *pspec,
GValue *value)
{
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
g_return_if_fail (G_IS_VALUE (value));
g_return_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value));
g_value_reset (value);
G_PARAM_SPEC_GET_CLASS (pspec)->value_set_default (pspec, value);
}
/**
* g_param_value_defaults:
* @pspec: a valid #GParamSpec
* @value: a #GValue of correct type for @pspec
*
* Checks whether @value contains the default value as specified in @pspec.
*
* Returns: whether @value contains the canonical default for this @pspec
*/
gboolean
g_param_value_defaults (GParamSpec *pspec,
GValue *value)
{
GValue dflt_value = G_VALUE_INIT;
gboolean defaults;
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
g_return_val_if_fail (G_IS_VALUE (value), FALSE);
g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value), FALSE);
g_value_init (&dflt_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
G_PARAM_SPEC_GET_CLASS (pspec)->value_set_default (pspec, &dflt_value);
defaults = G_PARAM_SPEC_GET_CLASS (pspec)->values_cmp (pspec, value, &dflt_value) == 0;
g_value_unset (&dflt_value);
return defaults;
}
/**
* g_param_value_validate:
* @pspec: a valid #GParamSpec
* @value: a #GValue of correct type for @pspec
*
* Ensures that the contents of @value comply with the specifications
* set out by @pspec. For example, a #GParamSpecInt might require
* that integers stored in @value may not be smaller than -42 and not be
* greater than +42. If @value contains an integer outside of this range,
* it is modified accordingly, so the resulting value will fit into the
* range -42 .. +42.
*
* Returns: whether modifying @value was necessary to ensure validity
*/
gboolean
g_param_value_validate (GParamSpec *pspec,
GValue *value)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
g_return_val_if_fail (G_IS_VALUE (value), FALSE);
g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value), FALSE);
if (G_PARAM_SPEC_GET_CLASS (pspec)->value_validate)
{
GValue oval = *value;
if (G_PARAM_SPEC_GET_CLASS (pspec)->value_validate (pspec, value) ||
memcmp (&oval.data, &value->data, sizeof (oval.data)))
return TRUE;
}
return FALSE;
}
/**
* g_param_value_convert:
* @pspec: a valid #GParamSpec
* @src_value: souce #GValue
* @dest_value: destination #GValue of correct type for @pspec
* @strict_validation: %TRUE requires @dest_value to conform to @pspec
* without modifications
*
* Transforms @src_value into @dest_value if possible, and then
* validates @dest_value, in order for it to conform to @pspec. If
* @strict_validation is %TRUE this function will only succeed if the
* transformed @dest_value complied to @pspec without modifications.
*
* See also g_value_type_transformable(), g_value_transform() and
* g_param_value_validate().
*
* Returns: %TRUE if transformation and validation were successful,
* %FALSE otherwise and @dest_value is left untouched.
*/
gboolean
g_param_value_convert (GParamSpec *pspec,
const GValue *src_value,
GValue *dest_value,
gboolean strict_validation)
{
GValue tmp_value = G_VALUE_INIT;
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
g_return_val_if_fail (G_IS_VALUE (src_value), FALSE);
g_return_val_if_fail (G_IS_VALUE (dest_value), FALSE);
g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, dest_value), FALSE);
/* better leave dest_value untouched when returning FALSE */
g_value_init (&tmp_value, G_VALUE_TYPE (dest_value));
if (g_value_transform (src_value, &tmp_value) &&
(!g_param_value_validate (pspec, &tmp_value) || !strict_validation))
{
g_value_unset (dest_value);
/* values are relocatable */
memcpy (dest_value, &tmp_value, sizeof (tmp_value));
return TRUE;
}
else
{
g_value_unset (&tmp_value);
return FALSE;
}
}
/**
* g_param_values_cmp:
* @pspec: a valid #GParamSpec
* @value1: a #GValue of correct type for @pspec
* @value2: a #GValue of correct type for @pspec
*
* Compares @value1 with @value2 according to @pspec, and return -1, 0 or +1,
* if @value1 is found to be less than, equal to or greater than @value2,
* respectively.
*
* Returns: -1, 0 or +1, for a less than, equal to or greater than result
*/
gint
g_param_values_cmp (GParamSpec *pspec,
const GValue *value1,
const GValue *value2)
{
gint cmp;
/* param_values_cmp() effectively does: value1 - value2
* so the return values are:
* -1) value1 < value2
* 0) value1 == value2
* 1) value1 > value2
*/
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), 0);
g_return_val_if_fail (G_IS_VALUE (value1), 0);
g_return_val_if_fail (G_IS_VALUE (value2), 0);
g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value1), 0);
g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value2), 0);
cmp = G_PARAM_SPEC_GET_CLASS (pspec)->values_cmp (pspec, value1, value2);
return CLAMP (cmp, -1, 1);
}
static void
value_param_init (GValue *value)
{
value->data[0].v_pointer = NULL;
}
static void
value_param_free_value (GValue *value)
{
if (value->data[0].v_pointer)
g_param_spec_unref (value->data[0].v_pointer);
}
static void
value_param_copy_value (const GValue *src_value,
GValue *dest_value)
{
if (src_value->data[0].v_pointer)
dest_value->data[0].v_pointer = g_param_spec_ref (src_value->data[0].v_pointer);
else
dest_value->data[0].v_pointer = NULL;
}
static void
value_param_transform_value (const GValue *src_value,
GValue *dest_value)
{
if (src_value->data[0].v_pointer &&
g_type_is_a (G_PARAM_SPEC_TYPE (dest_value->data[0].v_pointer), G_VALUE_TYPE (dest_value)))
dest_value->data[0].v_pointer = g_param_spec_ref (src_value->data[0].v_pointer);
else
dest_value->data[0].v_pointer = NULL;
}
static gpointer
value_param_peek_pointer (const GValue *value)
{
return value->data[0].v_pointer;
}
static gchar*
value_param_collect_value (GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags)
{
if (collect_values[0].v_pointer)
{
GParamSpec *param = collect_values[0].v_pointer;
if (param->g_type_instance.g_class == NULL)
return g_strconcat ("invalid unclassed param spec pointer for value type '",
G_VALUE_TYPE_NAME (value),
"'",
NULL);
else if (!g_value_type_compatible (G_PARAM_SPEC_TYPE (param), G_VALUE_TYPE (value)))
return g_strconcat ("invalid param spec type '",
G_PARAM_SPEC_TYPE_NAME (param),
"' for value type '",
G_VALUE_TYPE_NAME (value),
"'",
NULL);
value->data[0].v_pointer = g_param_spec_ref (param);
}
else
value->data[0].v_pointer = NULL;
return NULL;
}
static gchar*
value_param_lcopy_value (const GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags)
{
GParamSpec **param_p = collect_values[0].v_pointer;
if (!param_p)
return g_strdup_printf ("value location for '%s' passed as NULL", G_VALUE_TYPE_NAME (value));
if (!value->data[0].v_pointer)
*param_p = NULL;
else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
*param_p = value->data[0].v_pointer;
else
*param_p = g_param_spec_ref (value->data[0].v_pointer);
return NULL;
}
/* --- param spec pool --- */
/**
* GParamSpecPool:
*
* A #GParamSpecPool maintains a collection of #GParamSpec<!-- -->s which can be
* quickly accessed by owner and name. The implementation of the #GObject property
* system uses such a pool to store the #GParamSpecs of the properties all object
* types.
*/
struct _GParamSpecPool
{
GMutex mutex;
gboolean type_prefixing;
GHashTable *hash_table;
};
static guint
param_spec_pool_hash (gconstpointer key_spec)
{
const GParamSpec *key = key_spec;
const gchar *p;
guint h = key->owner_type;
for (p = key->name; *p; p++)
h = (h << 5) - h + *p;
return h;
}
static gboolean
param_spec_pool_equals (gconstpointer key_spec_1,
gconstpointer key_spec_2)
{
const GParamSpec *key1 = key_spec_1;
const GParamSpec *key2 = key_spec_2;
return (key1->owner_type == key2->owner_type &&
strcmp (key1->name, key2->name) == 0);
}
/**
* g_param_spec_pool_new:
* @type_prefixing: Whether the pool will support type-prefixed property names.
*
* Creates a new #GParamSpecPool.
*
* If @type_prefixing is %TRUE, lookups in the newly created pool will
* allow to specify the owner as a colon-separated prefix of the
* property name, like "GtkContainer:border-width". This feature is
* deprecated, so you should always set @type_prefixing to %FALSE.
*
* Returns: (transfer none): a newly allocated #GParamSpecPool.
*/
GParamSpecPool*
g_param_spec_pool_new (gboolean type_prefixing)
{
static GMutex init_mutex;
GParamSpecPool *pool = g_new (GParamSpecPool, 1);
memcpy (&pool->mutex, &init_mutex, sizeof (init_mutex));
pool->type_prefixing = type_prefixing != FALSE;
pool->hash_table = g_hash_table_new (param_spec_pool_hash, param_spec_pool_equals);
return pool;
}
/**
* g_param_spec_pool_insert:
* @pool: a #GParamSpecPool.
* @pspec: the #GParamSpec to insert
* @owner_type: a #GType identifying the owner of @pspec
*
* Inserts a #GParamSpec in the pool.
*/
void
g_param_spec_pool_insert (GParamSpecPool *pool,
GParamSpec *pspec,
GType owner_type)
{
const gchar *p;
if (pool && pspec && owner_type > 0 && pspec->owner_type == 0)
{
for (p = pspec->name; *p; p++)
{
if (!strchr (G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-_", *p))
{
g_warning (G_STRLOC ": pspec name \"%s\" contains invalid characters", pspec->name);
return;
}
}
g_mutex_lock (&pool->mutex);
pspec->owner_type = owner_type;
g_param_spec_ref (pspec);
g_hash_table_insert (pool->hash_table, pspec, pspec);
g_mutex_unlock (&pool->mutex);
}
else
{
g_return_if_fail (pool != NULL);
g_return_if_fail (pspec);
g_return_if_fail (owner_type > 0);
g_return_if_fail (pspec->owner_type == 0);
}
}
/**
* g_param_spec_pool_remove:
* @pool: a #GParamSpecPool
* @pspec: the #GParamSpec to remove
*
* Removes a #GParamSpec from the pool.
*/
void
g_param_spec_pool_remove (GParamSpecPool *pool,
GParamSpec *pspec)
{
if (pool && pspec)
{
g_mutex_lock (&pool->mutex);
if (g_hash_table_remove (pool->hash_table, pspec))
g_param_spec_unref (pspec);
else
g_warning (G_STRLOC ": attempt to remove unknown pspec '%s' from pool", pspec->name);
g_mutex_unlock (&pool->mutex);
}
else
{
g_return_if_fail (pool != NULL);
g_return_if_fail (pspec);
}
}
static inline GParamSpec*
param_spec_ht_lookup (GHashTable *hash_table,
const gchar *param_name,
GType owner_type,
gboolean walk_ancestors)
{
GParamSpec key, *pspec;
key.owner_type = owner_type;
key.name = (gchar*) param_name;
if (walk_ancestors)
do
{
pspec = g_hash_table_lookup (hash_table, &key);
if (pspec)
return pspec;
key.owner_type = g_type_parent (key.owner_type);
}
while (key.owner_type);
else
pspec = g_hash_table_lookup (hash_table, &key);
if (!pspec && !is_canonical (param_name))
{
gchar *canonical;
canonical = g_strdup (key.name);
canonicalize_key (canonical);
/* try canonicalized form */
key.name = canonical;
key.owner_type = owner_type;
if (walk_ancestors)
do
{
pspec = g_hash_table_lookup (hash_table, &key);
if (pspec)
{
g_free (canonical);
return pspec;
}
key.owner_type = g_type_parent (key.owner_type);
}
while (key.owner_type);
else
pspec = g_hash_table_lookup (hash_table, &key);
g_free (canonical);
}
return pspec;
}
/**
* g_param_spec_pool_lookup:
* @pool: a #GParamSpecPool
* @param_name: the name to look for
* @owner_type: the owner to look for
* @walk_ancestors: If %TRUE, also try to find a #GParamSpec with @param_name
* owned by an ancestor of @owner_type.
*
* Looks up a #GParamSpec in the pool.
*
* Returns: (transfer none): The found #GParamSpec, or %NULL if no
* matching #GParamSpec was found.
*/
GParamSpec*
g_param_spec_pool_lookup (GParamSpecPool *pool,
const gchar *param_name,
GType owner_type,
gboolean walk_ancestors)
{
GParamSpec *pspec;
gchar *delim;
if (!pool || !param_name)
{
g_return_val_if_fail (pool != NULL, NULL);
g_return_val_if_fail (param_name != NULL, NULL);
}
g_mutex_lock (&pool->mutex);
delim = pool->type_prefixing ? strchr (param_name, ':') : NULL;
/* try quick and away, i.e. without prefix */
if (!delim)
{
pspec = param_spec_ht_lookup (pool->hash_table, param_name, owner_type, walk_ancestors);
g_mutex_unlock (&pool->mutex);
return pspec;
}
/* strip type prefix */
if (pool->type_prefixing && delim[1] == ':')
{
guint l = delim - param_name;
gchar stack_buffer[32], *buffer = l < 32 ? stack_buffer : g_new (gchar, l + 1);
GType type;
strncpy (buffer, param_name, delim - param_name);
buffer[l] = 0;
type = g_type_from_name (buffer);
if (l >= 32)
g_free (buffer);
if (type) /* type==0 isn't a valid type pefix */
{
/* sanity check, these cases don't make a whole lot of sense */
if ((!walk_ancestors && type != owner_type) || !g_type_is_a (owner_type, type))
{
g_mutex_unlock (&pool->mutex);
return NULL;
}
owner_type = type;
param_name += l + 2;
pspec = param_spec_ht_lookup (pool->hash_table, param_name, owner_type, walk_ancestors);
g_mutex_unlock (&pool->mutex);
return pspec;
}
}
/* malformed param_name */
g_mutex_unlock (&pool->mutex);
return NULL;
}
static void
pool_list (gpointer key,
gpointer value,
gpointer user_data)
{
GParamSpec *pspec = value;
gpointer *data = user_data;
GType owner_type = (GType) data[1];
if (owner_type == pspec->owner_type)
data[0] = g_list_prepend (data[0], pspec);
}
/**
* g_param_spec_pool_list_owned:
* @pool: a #GParamSpecPool
* @owner_type: the owner to look for
*
* Gets an #GList of all #GParamSpec<!-- -->s owned by @owner_type in
* the pool.
*
* Returns: (transfer container) (element-type GObject.ParamSpec): a
* #GList of all #GParamSpec<!-- -->s owned by @owner_type in
* the pool#GParamSpec<!-- -->s.
*/
GList*
g_param_spec_pool_list_owned (GParamSpecPool *pool,
GType owner_type)
{
gpointer data[2];
g_return_val_if_fail (pool != NULL, NULL);
g_return_val_if_fail (owner_type > 0, NULL);
g_mutex_lock (&pool->mutex);
data[0] = NULL;
data[1] = (gpointer) owner_type;
g_hash_table_foreach (pool->hash_table, pool_list, &data);
g_mutex_unlock (&pool->mutex);
return data[0];
}
static gint
pspec_compare_id (gconstpointer a,
gconstpointer b)
{
const GParamSpec *pspec1 = a, *pspec2 = b;
if (pspec1->param_id < pspec2->param_id)
return -1;
if (pspec1->param_id > pspec2->param_id)
return 1;
return strcmp (pspec1->name, pspec2->name);
}
static inline GSList*
pspec_list_remove_overridden_and_redirected (GSList *plist,
GHashTable *ht,
GType owner_type,
guint *n_p)
{
GSList *rlist = NULL;
while (plist)
{
GSList *tmp = plist->next;
GParamSpec *pspec = plist->data;
GParamSpec *found;
gboolean remove = FALSE;
/* Remove paramspecs that are redirected, and also paramspecs
* that have are overridden by non-redirected properties.
* The idea is to get the single paramspec for each name that
* best corresponds to what the application sees.
*/
if (g_param_spec_get_redirect_target (pspec))
remove = TRUE;
else
{
found = param_spec_ht_lookup (ht, pspec->name, owner_type, TRUE);
if (found != pspec)
{
GParamSpec *redirect = g_param_spec_get_redirect_target (found);
if (redirect != pspec)
remove = TRUE;
}
}
if (remove)
{
g_slist_free_1 (plist);
}
else
{
plist->next = rlist;
rlist = plist;
*n_p += 1;
}
plist = tmp;
}
return rlist;
}
static void
pool_depth_list (gpointer key,
gpointer value,
gpointer user_data)
{
GParamSpec *pspec = value;
gpointer *data = user_data;
GSList **slists = data[0];
GType owner_type = (GType) data[1];
if (g_type_is_a (owner_type, pspec->owner_type))
{
if (G_TYPE_IS_INTERFACE (pspec->owner_type))
{
slists[0] = g_slist_prepend (slists[0], pspec);
}
else
{
guint d = g_type_depth (pspec->owner_type);
slists[d - 1] = g_slist_prepend (slists[d - 1], pspec);
}
}
}
/* We handle interfaces specially since we don't want to
* count interface prerequisites like normal inheritance;
* the property comes from the direct inheritance from
* the prerequisite class, not from the interface that
* prerequires it.
*
* also 'depth' isn't a meaningful concept for interface
* prerequites.
*/
static void
pool_depth_list_for_interface (gpointer key,
gpointer value,
gpointer user_data)
{
GParamSpec *pspec = value;
gpointer *data = user_data;
GSList **slists = data[0];
GType owner_type = (GType) data[1];
if (pspec->owner_type == owner_type)
slists[0] = g_slist_prepend (slists[0], pspec);
}
/**
* g_param_spec_pool_list:
* @pool: a #GParamSpecPool
* @owner_type: the owner to look for
* @n_pspecs_p: (out): return location for the length of the returned array
*
* Gets an array of all #GParamSpec<!-- -->s owned by @owner_type in
* the pool.
*
* Returns: (array length=n_pspecs_p) (transfer container): a newly
* allocated array containing pointers to all #GParamSpecs
* owned by @owner_type in the pool
*/
GParamSpec**
g_param_spec_pool_list (GParamSpecPool *pool,
GType owner_type,
guint *n_pspecs_p)
{
GParamSpec **pspecs, **p;
GSList **slists, *node;
gpointer data[2];
guint d, i;
g_return_val_if_fail (pool != NULL, NULL);
g_return_val_if_fail (owner_type > 0, NULL);
g_return_val_if_fail (n_pspecs_p != NULL, NULL);
g_mutex_lock (&pool->mutex);
*n_pspecs_p = 0;
d = g_type_depth (owner_type);
slists = g_new0 (GSList*, d);
data[0] = slists;
data[1] = (gpointer) owner_type;
g_hash_table_foreach (pool->hash_table,
G_TYPE_IS_INTERFACE (owner_type) ?
pool_depth_list_for_interface :
pool_depth_list,
&data);
for (i = 0; i < d; i++)
slists[i] = pspec_list_remove_overridden_and_redirected (slists[i], pool->hash_table, owner_type, n_pspecs_p);
pspecs = g_new (GParamSpec*, *n_pspecs_p + 1);
p = pspecs;
for (i = 0; i < d; i++)
{
slists[i] = g_slist_sort (slists[i], pspec_compare_id);
for (node = slists[i]; node; node = node->next)
*p++ = node->data;
g_slist_free (slists[i]);
}
*p++ = NULL;
g_free (slists);
g_mutex_unlock (&pool->mutex);
return pspecs;
}
/* --- auxiliary functions --- */
typedef struct
{
/* class portion */
GType value_type;
void (*finalize) (GParamSpec *pspec);
void (*value_set_default) (GParamSpec *pspec,
GValue *value);
gboolean (*value_validate) (GParamSpec *pspec,
GValue *value);
gint (*values_cmp) (GParamSpec *pspec,
const GValue *value1,
const GValue *value2);
} ParamSpecClassInfo;
static void
param_spec_generic_class_init (gpointer g_class,
gpointer class_data)
{
GParamSpecClass *class = g_class;
ParamSpecClassInfo *info = class_data;
class->value_type = info->value_type;
if (info->finalize)
class->finalize = info->finalize; /* optional */
class->value_set_default = info->value_set_default;
if (info->value_validate)
class->value_validate = info->value_validate; /* optional */
class->values_cmp = info->values_cmp;
g_free (class_data);
}
static void
default_value_set_default (GParamSpec *pspec,
GValue *value)
{
/* value is already zero initialized */
}
static gint
default_values_cmp (GParamSpec *pspec,
const GValue *value1,
const GValue *value2)
{
return memcmp (&value1->data, &value2->data, sizeof (value1->data));
}
/**
* g_param_type_register_static:
* @name: 0-terminated string used as the name of the new #GParamSpec type.
* @pspec_info: The #GParamSpecTypeInfo for this #GParamSpec type.
*
* Registers @name as the name of a new static type derived from
* #G_TYPE_PARAM. The type system uses the information contained in
* the #GParamSpecTypeInfo structure pointed to by @info to manage the
* #GParamSpec type and its instances.
*
* Returns: The new type identifier.
*/
GType
g_param_type_register_static (const gchar *name,
const GParamSpecTypeInfo *pspec_info)
{
GTypeInfo info = {
sizeof (GParamSpecClass), /* class_size */
NULL, /* base_init */
NULL, /* base_destroy */
param_spec_generic_class_init, /* class_init */
NULL, /* class_destroy */
NULL, /* class_data */
0, /* instance_size */
16, /* n_preallocs */
NULL, /* instance_init */
};
ParamSpecClassInfo *cinfo;
g_return_val_if_fail (name != NULL, 0);
g_return_val_if_fail (pspec_info != NULL, 0);
g_return_val_if_fail (g_type_from_name (name) == 0, 0);
g_return_val_if_fail (pspec_info->instance_size >= sizeof (GParamSpec), 0);
g_return_val_if_fail (g_type_name (pspec_info->value_type) != NULL, 0);
/* default: g_return_val_if_fail (pspec_info->value_set_default != NULL, 0); */
/* optional: g_return_val_if_fail (pspec_info->value_validate != NULL, 0); */
/* default: g_return_val_if_fail (pspec_info->values_cmp != NULL, 0); */
info.instance_size = pspec_info->instance_size;
info.n_preallocs = pspec_info->n_preallocs;
info.instance_init = (GInstanceInitFunc) pspec_info->instance_init;
cinfo = g_new (ParamSpecClassInfo, 1);
cinfo->value_type = pspec_info->value_type;
cinfo->finalize = pspec_info->finalize;
cinfo->value_set_default = pspec_info->value_set_default ? pspec_info->value_set_default : default_value_set_default;
cinfo->value_validate = pspec_info->value_validate;
cinfo->values_cmp = pspec_info->values_cmp ? pspec_info->values_cmp : default_values_cmp;
info.class_data = cinfo;
return g_type_register_static (G_TYPE_PARAM, name, &info, 0);
}
/**
* g_value_set_param:
* @value: a valid #GValue of type %G_TYPE_PARAM
* @param: (allow-none): the #GParamSpec to be set
*
* Set the contents of a %G_TYPE_PARAM #GValue to @param.
*/
void
g_value_set_param (GValue *value,
GParamSpec *param)
{
g_return_if_fail (G_VALUE_HOLDS_PARAM (value));
if (param)
g_return_if_fail (G_IS_PARAM_SPEC (param));
if (value->data[0].v_pointer)
g_param_spec_unref (value->data[0].v_pointer);
value->data[0].v_pointer = param;
if (value->data[0].v_pointer)
g_param_spec_ref (value->data[0].v_pointer);
}
/**
* g_value_set_param_take_ownership: (skip)
* @value: a valid #GValue of type %G_TYPE_PARAM
* @param: (allow-none): the #GParamSpec to be set
*
* This is an internal function introduced mainly for C marshallers.
*
* Deprecated: 2.4: Use g_value_take_param() instead.
*/
void
g_value_set_param_take_ownership (GValue *value,
GParamSpec *param)
{
g_value_take_param (value, param);
}
/**
* g_value_take_param: (skip)
* @value: a valid #GValue of type %G_TYPE_PARAM
* @param: (allow-none): the #GParamSpec to be set
*
* Sets the contents of a %G_TYPE_PARAM #GValue to @param and takes
* over the ownership of the callers reference to @param; the caller
* doesn't have to unref it any more.
*
* Since: 2.4
*/
void
g_value_take_param (GValue *value,
GParamSpec *param)
{
g_return_if_fail (G_VALUE_HOLDS_PARAM (value));
if (param)
g_return_if_fail (G_IS_PARAM_SPEC (param));
if (value->data[0].v_pointer)
g_param_spec_unref (value->data[0].v_pointer);
value->data[0].v_pointer = param; /* we take over the reference count */
}
/**
* g_value_get_param:
* @value: a valid #GValue whose type is derived from %G_TYPE_PARAM
*
* Get the contents of a %G_TYPE_PARAM #GValue.
*
* Returns: (transfer none): #GParamSpec content of @value
*/
GParamSpec*
g_value_get_param (const GValue *value)
{
g_return_val_if_fail (G_VALUE_HOLDS_PARAM (value), NULL);
return value->data[0].v_pointer;
}
/**
* g_value_dup_param: (skip)
* @value: a valid #GValue whose type is derived from %G_TYPE_PARAM
*
* Get the contents of a %G_TYPE_PARAM #GValue, increasing its
* reference count.
*
* Returns: #GParamSpec content of @value, should be unreferenced when
* no longer needed.
*/
GParamSpec*
g_value_dup_param (const GValue *value)
{
g_return_val_if_fail (G_VALUE_HOLDS_PARAM (value), NULL);
return value->data[0].v_pointer ? g_param_spec_ref (value->data[0].v_pointer) : NULL;
}
/**
* g_param_get_default_value:
* @param: a #GParamSpec
*
* Gets the default value of @param as a pointer to a #GValue.
*
* The #GValue will remain value for the life of @param.
*
* Returns: a pointer to a #GValue which must not be modified
*
* Since: 2.38
**/
const GValue *
g_param_spec_get_default_value (GParamSpec *pspec)
{
GParamSpecPrivate *priv = g_param_spec_get_private (pspec);
/* We use the type field of the GValue as the key for the once because
* it will be zero before it is initialised and non-zero after. We
* have to take care that we don't write a non-zero value to the type
* field before we are completely done, however, because then another
* thread could come along and find the value partially-initialised.
*
* In order to accomplish this we store the default value in a
* stack-allocated GValue. We then set the type field in that value
* to zero and copy the contents into place. We then end by storing
* the type as the last step in order to ensure that we're completely
* done before a g_once_init_enter() could take the fast path in
* another thread.
*/
if (g_once_init_enter (&priv->default_value.g_type))
{
GValue default_value = G_VALUE_INIT;
g_value_init (&default_value, pspec->value_type);
g_param_value_set_default (pspec, &default_value);
/* store all but the type */
default_value.g_type = 0;
priv->default_value = default_value;
g_once_init_leave (&priv->default_value.g_type, pspec->value_type);
}
return &priv->default_value;
}
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