glib/gio/gsettingsschema.c

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/*
* Copyright © 2010 Codethink Limited
* Copyright © 2011 Canonical Limited
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*
* 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 licence, 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.
*/
#include "config.h"
#include "gsettingsschema-internal.h"
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#include "gsettings.h"
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#include "gvdb/gvdb-reader.h"
#include "strinfo.c"
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#include <glibintl.h>
#include <locale.h>
#include <string.h>
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/**
* SECTION:gsettingsschema
* @short_description: introspecting and controlling the loading of
* #GSettings schemas
*
* The #GSettingsSchemaSource and #GSettingsSchema APIs provide a
* mechanism for advanced control over the loading of schemas and a
* mechanism for introspecting their content.
*
* Plugin loading systems that wish to provide plugins a way to access
* settings face the problem of how to make the schemas for these
* settings visible to GSettings. Typically, a plugin will want to ship
* the schema along with itself and it won't be installed into the
* standard system directories for schemas.
*
* #GSettingsSchemaSource provides a mechanism for dealing with this by
* allowing the creation of a new 'schema source' from which schemas can
* be acquired. This schema source can then become part of the metadata
* associated with the plugin and queried whenever the plugin requires
* access to some settings.
*
* Consider the following example:
*
* |[
* typedef struct
* {
* ...
* GSettingsSchemaSource *schema_source;
* ...
* } Plugin;
*
* Plugin *
* initialise_plugin (const gchar *dir)
* {
* Plugin *plugin;
*
* ...
*
* plugin->schema_source =
* g_settings_new_schema_source_from_directory (dir,
* g_settings_schema_source_get_default (), FALSE, NULL);
*
* ...
*
* return plugin;
* }
*
* ...
*
* GSettings *
* plugin_get_settings (Plugin *plugin,
* const gchar *schema_id)
* {
* GSettingsSchema *schema;
*
* if (schema_id == NULL)
* schema_id = plugin->identifier;
*
* schema = g_settings_schema_source_lookup (plugin->schema_source,
* schema_id, FALSE);
*
* if (schema == NULL)
* {
* ... disable the plugin or abort, etc ...
* }
*
* return g_settings_new_full (schema, NULL, NULL);
* }
* ]|
*
* The code above shows how hooks should be added to the code that
* initialises (or enables) the plugin to create the schema source and
* how an API can be added to the plugin system to provide a convenient
* way for the plugin to access its settings, using the schemas that it
* ships.
*
* From the standpoint of the plugin, it would need to ensure that it
* ships a gschemas.compiled file as part of itself, and then simply do
* the following:
*
* |[
* {
* GSettings *settings;
* gint some_value;
*
* settings = plugin_get_settings (self, NULL);
* some_value = g_settings_get_int (settings, "some-value");
* ...
* }
* ]|
*
* It's also possible that the plugin system expects the schema source
* files (ie: .gschema.xml files) instead of a gschemas.compiled file.
* In that case, the plugin loading system must compile the schemas for
* itself before attempting to create the settings source.
*
* Since: 2.32
**/
/**
* GSettingsSchema:
*
* This is an opaque structure type. You may not access it directly.
*
* Since: 2.32
**/
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struct _GSettingsSchema
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{
const gchar *gettext_domain;
const gchar *path;
GQuark *items;
gint n_items;
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GvdbTable *table;
gchar *id;
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gint ref_count;
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};
/**
* G_TYPE_SETTINGS_SCHEMA_SOURCE:
*
* A boxed #GType corresponding to #GSettingsSchemaSource.
*
* Since: 2.32
**/
G_DEFINE_BOXED_TYPE (GSettingsSchemaSource, g_settings_schema_source, g_settings_schema_source_ref, g_settings_schema_source_unref)
/**
* G_TYPE_SETTINGS_SCHEMA:
*
* A boxed #GType corresponding to #GSettingsSchema.
*
* Since: 2.32
**/
G_DEFINE_BOXED_TYPE (GSettingsSchema, g_settings_schema, g_settings_schema_ref, g_settings_schema_unref)
/**
* GSettingsSchemaSource:
*
* This is an opaque structure type. You may not access it directly.
*
* Since: 2.32
**/
struct _GSettingsSchemaSource
{
GSettingsSchemaSource *parent;
GvdbTable *table;
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gint ref_count;
};
static GSettingsSchemaSource *schema_sources;
static void
prepend_schema_table (GvdbTable *table)
{
GSettingsSchemaSource *source;
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/* we steal the reference from 'schema_sources' for our ->parent */
source = g_slice_new (GSettingsSchemaSource);
source->parent = schema_sources;
source->table = table;
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source->ref_count = 1;
schema_sources = source;
}
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/**
* g_settings_schema_source_ref:
* @source: a #GSettingsSchemaSource
*
* Increase the reference count of @source, returning a new reference.
*
* Returns: a new reference to @source
*
* Since: 2.32
**/
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GSettingsSchemaSource *
g_settings_schema_source_ref (GSettingsSchemaSource *source)
{
g_atomic_int_inc (&source->ref_count);
return source;
}
/**
* g_settings_schema_source_unref:
* @source: a #GSettingsSchemaSource
*
* Decrease the reference count of @source, possibly freeing it.
*
* Since: 2.32
**/
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void
g_settings_schema_source_unref (GSettingsSchemaSource *source)
{
if (g_atomic_int_dec_and_test (&source->ref_count))
{
if (source == schema_sources)
g_error ("g_settings_schema_source_unref() called too many times on the default schema source");
if (source->parent)
g_settings_schema_source_unref (source->parent);
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gvdb_table_unref (source->table);
g_slice_free (GSettingsSchemaSource, source);
}
}
/**
* g_settings_schema_source_new_from_directory:
* @directory: the filename of a directory
* @parent: (allow-none): a #GSettingsSchemaSource, or %NULL
* @trusted: %TRUE, if the directory is trusted
* @error: a pointer to a #GError pointer set to %NULL, or %NULL
*
* Attempts to create a new schema source corresponding to the contents
* of the given directory.
*
* This function is not required for normal uses of #GSettings but it
* may be useful to authors of plugin management systems.
*
* The directory should contain a file called
* <filename>gschemas.compiled</filename> as produced by
* <command>glib-compile-schemas</command>.
*
* If @trusted is %TRUE then <filename>gschemas.compiled</filename> is
* trusted not to be corrupted. This assumption has a performance
* advantage, but can result in crashes or inconsistent behaviour in the
* case of a corrupted file. Generally, you should set @trusted to
* %TRUE for files installed by the system and to %FALSE for files in
* the home directory.
*
* If @parent is non-%NULL then there are two effects.
*
* First, if g_settings_schema_source_lookup() is called with the
* @recursive flag set to %TRUE and the schema can not be found in the
* source, the lookup will recurse to the parent.
*
* Second, any references to other schemas specified within this
* source (ie: <literal>child</literal> or <literal>extents</literal>)
* references may be resolved from the @parent.
*
* For this second reason, except in very unusual situations, the
* @parent should probably be given as the default schema source, as
* returned by g_settings_schema_source_get_default().
*
* Since: 2.32
**/
GSettingsSchemaSource *
g_settings_schema_source_new_from_directory (const gchar *directory,
GSettingsSchemaSource *parent,
gboolean trusted,
GError **error)
{
GSettingsSchemaSource *source;
GvdbTable *table;
gchar *filename;
filename = g_build_filename (directory, "gschemas.compiled", NULL);
table = gvdb_table_new (filename, trusted, error);
g_free (filename);
if (table == NULL)
return NULL;
source = g_slice_new (GSettingsSchemaSource);
source->parent = parent ? g_settings_schema_source_ref (parent) : NULL;
source->table = table;
source->ref_count = 1;
return source;
}
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static void
initialise_schema_sources (void)
{
static gsize initialised;
/* need a separate variable because 'schema_sources' may legitimately
* be null if we have zero valid schema sources
*/
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if G_UNLIKELY (g_once_init_enter (&initialised))
{
const gchar * const *dirs;
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const gchar *path;
gint i;
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/* iterate in reverse: count up, then count down */
dirs = g_get_system_data_dirs ();
for (i = 0; dirs[i]; i++);
while (i--)
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{
gchar *filename;
GvdbTable *table;
filename = g_build_filename (dirs[i], "glib-2.0", "schemas", "gschemas.compiled", NULL);
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table = gvdb_table_new (filename, TRUE, NULL);
if (table != NULL)
prepend_schema_table (table);
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g_free (filename);
}
if ((path = g_getenv ("GSETTINGS_SCHEMA_DIR")) != NULL)
{
gchar *filename;
GvdbTable *table;
filename = g_build_filename (path, "gschemas.compiled", NULL);
table = gvdb_table_new (filename, TRUE, NULL);
if (table != NULL)
prepend_schema_table (table);
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g_free (filename);
}
g_once_init_leave (&initialised, TRUE);
}
}
/**
* g_settings_schema_source_get_default:
*
* Gets the default system schema source.
*
* This function is not required for normal uses of #GSettings but it
* may be useful to authors of plugin management systems or to those who
* want to introspect the content of schemas.
*
* If no schemas are installed, %NULL will be returned.
*
* The returned source may actually consist of multiple schema sources
* from different directories, depending on which directories were given
* in <envar>XDG_DATA_DIRS</envar> and
* <envar>GSETTINGS_SCHEMA_DIR</envar>. For this reason, all lookups
* performed against the default source should probably be done
* recursively.
*
* Returns: (transfer none): the default schema source
*
* Since: 2.32
**/
GSettingsSchemaSource *
g_settings_schema_source_get_default (void)
{
initialise_schema_sources ();
return schema_sources;
}
/**
* g_settings_schema_source_lookup:
* @source: a #GSettingsSchemaSource
* @schema_id: a schema ID
* @recursive: %TRUE if the lookup should be recursive
*
* Looks up a schema with the identifier @schema_id in @source.
*
* This function is not required for normal uses of #GSettings but it
* may be useful to authors of plugin management systems or to those who
* want to introspect the content of schemas.
*
* If the schema isn't found directly in @source and @recursive is %TRUE
* then the parent sources will also be checked.
*
* If the schema isn't found, %NULL is returned.
*
* Returns: (transfer full): a new #GSettingsSchema
*
* Since: 2.32
**/
GSettingsSchema *
g_settings_schema_source_lookup (GSettingsSchemaSource *source,
const gchar *schema_id,
gboolean recursive)
{
GSettingsSchema *schema;
GvdbTable *table;
g_return_val_if_fail (source != NULL, NULL);
g_return_val_if_fail (schema_id != NULL, NULL);
table = gvdb_table_get_table (source->table, schema_id);
if (table == NULL && recursive)
for (source = source->parent; source; source = source->parent)
if ((table = gvdb_table_get_table (source->table, schema_id)))
break;
if (table == NULL)
return NULL;
schema = g_slice_new0 (GSettingsSchema);
schema->ref_count = 1;
schema->id = g_strdup (schema_id);
schema->table = table;
schema->path = g_settings_schema_get_string (schema, ".path");
schema->gettext_domain = g_settings_schema_get_string (schema, ".gettext-domain");
if (schema->gettext_domain)
bind_textdomain_codeset (schema->gettext_domain, "UTF-8");
return schema;
}
static gboolean
steal_item (gpointer key,
gpointer value,
gpointer user_data)
{
gchar ***ptr = user_data;
*(*ptr)++ = (gchar *) key;
return TRUE;
}
static const gchar * const *non_relocatable_schema_list;
static const gchar * const *relocatable_schema_list;
static gsize schema_lists_initialised;
static void
ensure_schema_lists (void)
{
if (g_once_init_enter (&schema_lists_initialised))
{
GSettingsSchemaSource *source;
GHashTable *single, *reloc;
const gchar **ptr;
gchar **list;
gint i;
initialise_schema_sources ();
/* We use hash tables to avoid duplicate listings for schemas that
* appear in more than one file.
*/
single = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
reloc = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
for (source = schema_sources; source; source = source->parent)
{
list = gvdb_table_list (source->table, "");
g_assert (list != NULL);
for (i = 0; list[i]; i++)
{
if (!g_hash_table_lookup (single, list[i]) &&
!g_hash_table_lookup (reloc, list[i]))
{
GvdbTable *table;
table = gvdb_table_get_table (source->table, list[i]);
g_assert (table != NULL);
if (gvdb_table_has_value (table, ".path"))
g_hash_table_insert (single, g_strdup (list[i]), NULL);
else
g_hash_table_insert (reloc, g_strdup (list[i]), NULL);
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gvdb_table_unref (table);
}
}
g_strfreev (list);
}
ptr = g_new (const gchar *, g_hash_table_size (single) + 1);
non_relocatable_schema_list = ptr;
g_hash_table_foreach_steal (single, steal_item, &ptr);
g_hash_table_unref (single);
*ptr = NULL;
ptr = g_new (const gchar *, g_hash_table_size (reloc) + 1);
relocatable_schema_list = ptr;
g_hash_table_foreach_steal (reloc, steal_item, &ptr);
g_hash_table_unref (reloc);
*ptr = NULL;
g_once_init_leave (&schema_lists_initialised, TRUE);
}
}
/**
* g_settings_list_schemas:
*
* Gets a list of the #GSettings schemas installed on the system. The
* returned list is exactly the list of schemas for which you may call
* g_settings_new() without adverse effects.
*
* This function does not list the schemas that do not provide their own
* paths (ie: schemas for which you must use
* g_settings_new_with_path()). See
* g_settings_list_relocatable_schemas() for that.
*
* Returns: (element-type utf8) (transfer none): a list of #GSettings
* schemas that are available. The list must not be modified or
* freed.
*
* Since: 2.26
**/
const gchar * const *
g_settings_list_schemas (void)
{
ensure_schema_lists ();
return non_relocatable_schema_list;
}
/**
* g_settings_list_relocatable_schemas:
*
* Gets a list of the relocatable #GSettings schemas installed on the
* system. These are schemas that do not provide their own path. It is
* usual to instantiate these schemas directly, but if you want to you
* can use g_settings_new_with_path() to specify the path.
*
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* The output of this function, taken together with the output of
* g_settings_list_schemas() represents the complete list of all
* installed schemas.
*
* Returns: (element-type utf8) (transfer none): a list of relocatable
* #GSettings schemas that are available. The list must not be
* modified or freed.
*
* Since: 2.28
**/
const gchar * const *
g_settings_list_relocatable_schemas (void)
{
ensure_schema_lists ();
return relocatable_schema_list;
}
/**
* g_settings_schema_ref:
* @schema: a #GSettingsSchema
*
* Increase the reference count of @schema, returning a new reference.
*
* Returns: a new reference to @schema
*
* Since: 2.32
**/
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GSettingsSchema *
g_settings_schema_ref (GSettingsSchema *schema)
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{
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g_atomic_int_inc (&schema->ref_count);
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return schema;
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}
/**
* g_settings_schema_unref:
* @schema: a #GSettingsSchema
*
* Decrease the reference count of @schema, possibly freeing it.
*
* Since: 2.32
**/
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void
g_settings_schema_unref (GSettingsSchema *schema)
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{
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if (g_atomic_int_dec_and_test (&schema->ref_count))
{
gvdb_table_unref (schema->table);
g_free (schema->items);
g_free (schema->id);
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g_slice_free (GSettingsSchema, schema);
}
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}
const gchar *
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g_settings_schema_get_string (GSettingsSchema *schema,
const gchar *key)
{
const gchar *result = NULL;
GVariant *value;
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if ((value = gvdb_table_get_raw_value (schema->table, key)))
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{
result = g_variant_get_string (value, NULL);
g_variant_unref (value);
}
return result;
}
GVariantIter *
g_settings_schema_get_value (GSettingsSchema *schema,
const gchar *key)
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{
GVariantIter *iter;
GVariant *value;
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value = gvdb_table_get_raw_value (schema->table, key);
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if G_UNLIKELY (value == NULL)
g_error ("Settings schema '%s' does not contain a key named '%s'", schema->id, key);
iter = g_variant_iter_new (value);
g_variant_unref (value);
return iter;
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}
/**
* g_settings_schema_get_path:
* @schema: a #GSettingsSchema
*
* Gets the path associated with @schema, or %NULL.
*
* Schemas may be single-instance or relocatable. Single-instance
* schemas correspond to exactly one set of keys in the backend
* database: those located at the path returned by this function.
*
* Relocatable schemas can be referenced by other schemas and can
* threfore describe multiple sets of keys at different locations. For
* relocatable schemas, this function will return %NULL.
*
* Returns: (transfer none): the path of the schema, or %NULL
*
* Since: 2.32
**/
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const gchar *
g_settings_schema_get_path (GSettingsSchema *schema)
{
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return schema->path;
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}
const gchar *
g_settings_schema_get_gettext_domain (GSettingsSchema *schema)
{
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return schema->gettext_domain;
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}
gboolean
g_settings_schema_has_key (GSettingsSchema *schema,
const gchar *key)
{
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return gvdb_table_has_value (schema->table, key);
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}
const GQuark *
g_settings_schema_list (GSettingsSchema *schema,
gint *n_items)
{
gint i, j;
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if (schema->items == NULL)
{
gchar **list;
gint len;
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list = gvdb_table_list (schema->table, "");
len = list ? g_strv_length (list) : 0;
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schema->items = g_new (GQuark, len);
j = 0;
for (i = 0; i < len; i++)
if (list[i][0] != '.')
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schema->items[j++] = g_quark_from_string (list[i]);
schema->n_items = j;
g_strfreev (list);
}
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*n_items = schema->n_items;
return schema->items;
}
/**
* g_settings_schema_get_id:
* @schema: a #GSettingsSchema
*
* Get the ID of @schema.
*
* Returns: (transfer none): the ID
**/
const gchar *
g_settings_schema_get_id (GSettingsSchema *schema)
{
return schema->id;
}
static inline void
endian_fixup (GVariant **value)
{
#if G_BYTE_ORDER == G_BIG_ENDIAN
GVariant *tmp;
tmp = g_variant_byteswap (*value);
g_variant_unref (*value);
*value = tmp;
#endif
}
void
g_settings_schema_key_init (GSettingsSchemaKey *key,
GSettingsSchema *schema,
const gchar *name)
{
GVariantIter *iter;
GVariant *data;
guchar code;
memset (key, 0, sizeof *key);
iter = g_settings_schema_get_value (schema, name);
key->schema = g_settings_schema_ref (schema);
key->default_value = g_variant_iter_next_value (iter);
endian_fixup (&key->default_value);
key->type = g_variant_get_type (key->default_value);
key->name = g_intern_string (name);
while (g_variant_iter_next (iter, "(y*)", &code, &data))
{
switch (code)
{
case 'l':
/* translation requested */
g_variant_get (data, "(y&s)", &key->lc_char, &key->unparsed);
break;
case 'e':
/* enumerated types... */
key->is_enum = TRUE;
goto choice;
case 'f':
/* flags... */
key->is_flags = TRUE;
goto choice;
choice: case 'c':
/* ..., choices, aliases */
key->strinfo = g_variant_get_fixed_array (data, &key->strinfo_length, sizeof (guint32));
break;
case 'r':
g_variant_get (data, "(**)", &key->minimum, &key->maximum);
endian_fixup (&key->minimum);
endian_fixup (&key->maximum);
break;
default:
g_warning ("unknown schema extension '%c'", code);
break;
}
g_variant_unref (data);
}
g_variant_iter_free (iter);
}
void
g_settings_schema_key_clear (GSettingsSchemaKey *key)
{
if (key->minimum)
g_variant_unref (key->minimum);
if (key->maximum)
g_variant_unref (key->maximum);
g_variant_unref (key->default_value);
g_settings_schema_unref (key->schema);
}
gboolean
g_settings_schema_key_type_check (GSettingsSchemaKey *key,
GVariant *value)
{
g_return_val_if_fail (value != NULL, FALSE);
return g_variant_is_of_type (value, key->type);
}
gboolean
g_settings_schema_key_range_check (GSettingsSchemaKey *key,
GVariant *value)
{
if (key->minimum == NULL && key->strinfo == NULL)
return TRUE;
if (g_variant_is_container (value))
{
gboolean ok = TRUE;
GVariantIter iter;
GVariant *child;
g_variant_iter_init (&iter, value);
while (ok && (child = g_variant_iter_next_value (&iter)))
{
ok = g_settings_schema_key_range_check (key, child);
g_variant_unref (child);
}
return ok;
}
if (key->minimum)
{
return g_variant_compare (key->minimum, value) <= 0 &&
g_variant_compare (value, key->maximum) <= 0;
}
return strinfo_is_string_valid (key->strinfo, key->strinfo_length,
g_variant_get_string (value, NULL));
}
GVariant *
g_settings_schema_key_range_fixup (GSettingsSchemaKey *key,
GVariant *value)
{
const gchar *target;
if (g_settings_schema_key_range_check (key, value))
return g_variant_ref (value);
if (key->strinfo == NULL)
return NULL;
if (g_variant_is_container (value))
{
GVariantBuilder builder;
GVariantIter iter;
GVariant *child;
g_variant_iter_init (&iter, value);
g_variant_builder_init (&builder, g_variant_get_type (value));
while ((child = g_variant_iter_next_value (&iter)))
{
GVariant *fixed;
fixed = g_settings_schema_key_range_fixup (key, child);
g_variant_unref (child);
if (fixed == NULL)
{
g_variant_builder_clear (&builder);
return NULL;
}
g_variant_builder_add_value (&builder, fixed);
g_variant_unref (fixed);
}
return g_variant_ref_sink (g_variant_builder_end (&builder));
}
target = strinfo_string_from_alias (key->strinfo, key->strinfo_length,
g_variant_get_string (value, NULL));
return target ? g_variant_ref_sink (g_variant_new_string (target)) : NULL;
}
GVariant *
g_settings_schema_key_get_translated_default (GSettingsSchemaKey *key)
{
const gchar *translated;
GError *error = NULL;
const gchar *domain;
GVariant *value;
domain = g_settings_schema_get_gettext_domain (key->schema);
if (key->lc_char == '\0')
/* translation not requested for this key */
return NULL;
if (key->lc_char == 't')
translated = g_dcgettext (domain, key->unparsed, LC_TIME);
else
translated = g_dgettext (domain, key->unparsed);
if (translated == key->unparsed)
/* the default value was not translated */
return NULL;
/* try to parse the translation of the unparsed default */
value = g_variant_parse (key->type, translated, NULL, NULL, &error);
if (value == NULL)
{
g_warning ("Failed to parse translated string `%s' for "
"key `%s' in schema `%s': %s", key->unparsed, key->name,
g_settings_schema_get_id (key->schema), error->message);
g_warning ("Using untranslated default instead.");
g_error_free (error);
}
else if (!g_settings_schema_key_range_check (key, value))
{
g_warning ("Translated default `%s' for key `%s' in schema `%s' "
"is outside of valid range", key->unparsed, key->name,
g_settings_schema_get_id (key->schema));
g_variant_unref (value);
value = NULL;
}
return value;
}
gint
g_settings_schema_key_to_enum (GSettingsSchemaKey *key,
GVariant *value)
{
gboolean it_worked;
guint result;
it_worked = strinfo_enum_from_string (key->strinfo, key->strinfo_length,
g_variant_get_string (value, NULL),
&result);
/* 'value' can only come from the backend after being filtered for validity,
* from the translation after being filtered for validity, or from the schema
* itself (which the schema compiler checks for validity). If this assertion
* fails then it's really a bug in GSettings or the schema compiler...
*/
g_assert (it_worked);
return result;
}
GVariant *
g_settings_schema_key_from_enum (GSettingsSchemaKey *key,
gint value)
{
const gchar *string;
string = strinfo_string_from_enum (key->strinfo, key->strinfo_length, value);
if (string == NULL)
return NULL;
return g_variant_new_string (string);
}
guint
g_settings_schema_key_to_flags (GSettingsSchemaKey *key,
GVariant *value)
{
GVariantIter iter;
const gchar *flag;
guint result;
result = 0;
g_variant_iter_init (&iter, value);
while (g_variant_iter_next (&iter, "&s", &flag))
{
gboolean it_worked;
guint flag_value;
it_worked = strinfo_enum_from_string (key->strinfo, key->strinfo_length, flag, &flag_value);
/* as in g_settings_to_enum() */
g_assert (it_worked);
result |= flag_value;
}
return result;
}
GVariant *
g_settings_schema_key_from_flags (GSettingsSchemaKey *key,
guint value)
{
GVariantBuilder builder;
gint i;
g_variant_builder_init (&builder, G_VARIANT_TYPE ("as"));
for (i = 0; i < 32; i++)
if (value & (1u << i))
{
const gchar *string;
string = strinfo_string_from_enum (key->strinfo, key->strinfo_length, 1u << i);
if (string == NULL)
{
g_variant_builder_clear (&builder);
return NULL;
}
g_variant_builder_add (&builder, "s", string);
}
return g_variant_builder_end (&builder);
}