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glib2.0/gio/gsettingsschema.c

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/*
* Copyright © 2010 Codethink Limited
* Copyright © 2011 Canonical Limited
*
* 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 2.1 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gsettingsschema-internal.h"
#include "gsettings.h"
#include "gvdb/gvdb-reader.h"
#include "strinfo.c"
#include <glibintl.h>
#include <locale.h>
#include <string.h>
#include <stdlib.h>
/**
* SECTION:gsettingsschema
* @short_description: Introspecting and controlling the loading
* of GSettings schemas
* @include: gio/gio.h
*
* 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:
*
* |[<!-- language="C" -->
* typedef struct
* {
* ...
* GSettingsSchemaSource *schema_source;
* ...
* } Plugin;
*
* Plugin *
* initialise_plugin (const gchar *dir)
* {
* Plugin *plugin;
*
* ...
*
* plugin->schema_source =
* g_settings_schema_source_new_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:
*
* |[<!-- language="C" -->
* {
* 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
**/
/**
* GSettingsSchemaKey:
*
* #GSettingsSchemaKey is an opaque data structure and can only be accessed
* using the following functions.
**/
/**
* GSettingsSchema:
*
* This is an opaque structure type. You may not access it directly.
*
* Since: 2.32
**/
struct _GSettingsSchema
{
GSettingsSchemaSource *source;
const gchar *gettext_domain;
const gchar *path;
GQuark *items;
gint n_items;
GvdbTable *table;
gchar *id;
GSettingsSchema *extends;
gint ref_count;
};
/**
* 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;
gchar *directory;
GvdbTable *table;
GHashTable **text_tables;
gint ref_count;
};
static GSettingsSchemaSource *schema_sources;
/**
* 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
**/
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
**/
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);
gvdb_table_free (source->table);
g_free (source->directory);
if (source->text_tables)
{
g_hash_table_unref (source->text_tables[0]);
g_hash_table_unref (source->text_tables[1]);
g_free (source->text_tables);
}
g_slice_free (GSettingsSchemaSource, source);
}
}
/**
* g_settings_schema_source_new_from_directory:
* @directory: (type filename): the filename of a directory
* @parent: (nullable): 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 `gschemas.compiled` as
* produced by the [glib-compile-schemas][glib-compile-schemas] tool.
*
* If @trusted is %TRUE then `gschemas.compiled` 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.
*
* In either case, an empty file or some types of corruption in the file will
* result in %G_FILE_ERROR_INVAL being returned.
*
* 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: `child` or `extends`) 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->directory = g_strdup (directory);
source->parent = parent ? g_settings_schema_source_ref (parent) : NULL;
source->text_tables = NULL;
source->table = table;
source->ref_count = 1;
return source;
}
static void
try_prepend_dir (const gchar *directory)
{
GSettingsSchemaSource *source;
source = g_settings_schema_source_new_from_directory (directory, schema_sources, TRUE, NULL);
/* If we successfully created it then prepend it to the global list */
if (source != NULL)
schema_sources = source;
}
static void
try_prepend_data_dir (const gchar *directory)
{
gchar *dirname = g_build_filename (directory, "glib-2.0", "schemas", NULL);
try_prepend_dir (dirname);
g_free (dirname);
}
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
*/
if G_UNLIKELY (g_once_init_enter (&initialised))
{
const gchar * const *dirs;
const gchar *path;
gchar **extra_schema_dirs;
gint i;
/* iterate in reverse: count up, then count down */
dirs = g_get_system_data_dirs ();
for (i = 0; dirs[i]; i++);
while (i--)
try_prepend_data_dir (dirs[i]);
try_prepend_data_dir (g_get_user_data_dir ());
if ((path = g_getenv ("GSETTINGS_SCHEMA_DIR")) != NULL)
{
extra_schema_dirs = g_strsplit (path, G_SEARCHPATH_SEPARATOR_S, 0);
for (i = 0; extra_schema_dirs[i]; i++);
while (i--)
try_prepend_dir (extra_schema_dirs[i]);
g_strfreev (extra_schema_dirs);
}
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 `XDG_DATA_DIRS` and `GSETTINGS_SCHEMA_DIR`. For this reason, all
* lookups performed against the default source should probably be done
* recursively.
*
* Returns: (transfer none) (nullable): 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: (nullable) (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;
const gchar *extends;
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->source = g_settings_schema_source_ref (source);
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");
extends = g_settings_schema_get_string (schema, ".extends");
if (extends)
{
schema->extends = g_settings_schema_source_lookup (source, extends, TRUE);
if (schema->extends == NULL)
g_warning ("Schema '%s' extends schema '%s' but we could not find it", schema_id, extends);
}
return schema;
}
typedef struct
{
GHashTable *summaries;
GHashTable *descriptions;
GSList *gettext_domain;
GSList *schema_id;
GSList *key_name;
GString *string;
} TextTableParseInfo;
static const gchar *
get_attribute_value (GSList *list)
{
GSList *node;
for (node = list; node; node = node->next)
if (node->data)
return node->data;
return NULL;
}
static void
pop_attribute_value (GSList **list)
{
gchar *top;
top = (*list)->data;
*list = g_slist_remove (*list, top);
g_free (top);
}
static void
push_attribute_value (GSList **list,
const gchar *value)
{
*list = g_slist_prepend (*list, g_strdup (value));
}
static void
start_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
gpointer user_data,
GError **error)
{
TextTableParseInfo *info = user_data;
const gchar *gettext_domain = NULL;
const gchar *schema_id = NULL;
const gchar *key_name = NULL;
gint i;
for (i = 0; attribute_names[i]; i++)
{
if (g_str_equal (attribute_names[i], "gettext-domain"))
gettext_domain = attribute_values[i];
else if (g_str_equal (attribute_names[i], "id"))
schema_id = attribute_values[i];
else if (g_str_equal (attribute_names[i], "name"))
key_name = attribute_values[i];
}
push_attribute_value (&info->gettext_domain, gettext_domain);
push_attribute_value (&info->schema_id, schema_id);
push_attribute_value (&info->key_name, key_name);
if (info->string)
{
g_string_free (info->string, TRUE);
info->string = NULL;
}
if (g_str_equal (element_name, "summary") || g_str_equal (element_name, "description"))
info->string = g_string_new (NULL);
}
static gchar *
normalise_whitespace (const gchar *orig)
{
/* We normalise by the same rules as in intltool:
*
* sub cleanup {
* s/^\s+//;
* s/\s+$//;
* s/\s+/ /g;
* return $_;
* }
*
* $message = join "\n\n", map &cleanup, split/\n\s*\n+/, $message;
*
* Where \s is an ascii space character.
*
* We aim for ease of implementation over efficiency -- this code is
* not run in normal applications.
*/
static GRegex *cleanup[3];
static GRegex *splitter;
gchar **lines;
gchar *result;
gint i;
if (g_once_init_enter (&splitter))
{
GRegex *s;
cleanup[0] = g_regex_new ("^\\s+", 0, 0, 0);
cleanup[1] = g_regex_new ("\\s+$", 0, 0, 0);
cleanup[2] = g_regex_new ("\\s+", 0, 0, 0);
s = g_regex_new ("\\n\\s*\\n+", 0, 0, 0);
g_once_init_leave (&splitter, s);
}
lines = g_regex_split (splitter, orig, 0);
for (i = 0; lines[i]; i++)
{
gchar *a, *b, *c;
a = g_regex_replace_literal (cleanup[0], lines[i], -1, 0, "", 0, 0);
b = g_regex_replace_literal (cleanup[1], a, -1, 0, "", 0, 0);
c = g_regex_replace_literal (cleanup[2], b, -1, 0, " ", 0, 0);
g_free (lines[i]);
g_free (a);
g_free (b);
lines[i] = c;
}
result = g_strjoinv ("\n\n", lines);
g_strfreev (lines);
return result;
}
static void
end_element (GMarkupParseContext *context,
const gchar *element_name,
gpointer user_data,
GError **error)
{
TextTableParseInfo *info = user_data;
pop_attribute_value (&info->gettext_domain);
pop_attribute_value (&info->schema_id);
pop_attribute_value (&info->key_name);
if (info->string)
{
GHashTable *source_table = NULL;
const gchar *gettext_domain;
const gchar *schema_id;
const gchar *key_name;
gettext_domain = get_attribute_value (info->gettext_domain);
schema_id = get_attribute_value (info->schema_id);
key_name = get_attribute_value (info->key_name);
if (g_str_equal (element_name, "summary"))
source_table = info->summaries;
else if (g_str_equal (element_name, "description"))
source_table = info->descriptions;
if (source_table && schema_id && key_name)
{
GHashTable *schema_table;
gchar *normalised;
schema_table = g_hash_table_lookup (source_table, schema_id);
if (schema_table == NULL)
{
schema_table = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
g_hash_table_insert (source_table, g_strdup (schema_id), schema_table);
}
normalised = normalise_whitespace (info->string->str);
if (gettext_domain && normalised[0])
{
gchar *translated;
translated = g_strdup (g_dgettext (gettext_domain, normalised));
g_free (normalised);
normalised = translated;
}
g_hash_table_insert (schema_table, g_strdup (key_name), normalised);
}
g_string_free (info->string, TRUE);
info->string = NULL;
}
}
static void
text (GMarkupParseContext *context,
const gchar *text,
gsize text_len,
gpointer user_data,
GError **error)
{
TextTableParseInfo *info = user_data;
if (info->string)
g_string_append_len (info->string, text, text_len);
}
static void
parse_into_text_tables (const gchar *directory,
GHashTable *summaries,
GHashTable *descriptions)
{
GMarkupParser parser = { start_element, end_element, text };
TextTableParseInfo info = { summaries, descriptions };
const gchar *basename;
GDir *dir;
dir = g_dir_open (directory, 0, NULL);
while ((basename = g_dir_read_name (dir)))
{
gchar *filename;
gchar *contents;
gsize size;
filename = g_build_filename (directory, basename, NULL);
if (g_file_get_contents (filename, &contents, &size, NULL))
{
GMarkupParseContext *context;
context = g_markup_parse_context_new (&parser, G_MARKUP_TREAT_CDATA_AS_TEXT, &info, NULL);
/* Ignore errors here, this is best effort only. */
if (g_markup_parse_context_parse (context, contents, size, NULL))
(void) g_markup_parse_context_end_parse (context, NULL);
g_markup_parse_context_free (context);
/* Clean up dangling stuff in case there was an error. */
g_slist_free_full (info.gettext_domain, g_free);
g_slist_free_full (info.schema_id, g_free);
g_slist_free_full (info.key_name, g_free);
info.gettext_domain = NULL;
info.schema_id = NULL;
info.key_name = NULL;
if (info.string)
{
g_string_free (info.string, TRUE);
info.string = NULL;
}
g_free (contents);
}
g_free (filename);
}
g_dir_close (dir);
}
static GHashTable **
g_settings_schema_source_get_text_tables (GSettingsSchemaSource *source)
{
if (g_once_init_enter (&source->text_tables))
{
GHashTable **text_tables;
text_tables = g_new (GHashTable *, 2);
text_tables[0] = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, (GDestroyNotify) g_hash_table_unref);
text_tables[1] = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, (GDestroyNotify) g_hash_table_unref);
if (source->directory)
parse_into_text_tables (source->directory, text_tables[0], text_tables[1]);
g_once_init_leave (&source->text_tables, text_tables);
}
return source->text_tables;
}
/**
* g_settings_schema_source_list_schemas:
* @source: a #GSettingsSchemaSource
* @recursive: if we should recurse
* @non_relocatable: (out) (transfer full) (array zero-terminated=1): the
* list of non-relocatable schemas, in no defined order
* @relocatable: (out) (transfer full) (array zero-terminated=1): the list
* of relocatable schemas, in no defined order
*
* Lists the schemas in a given source.
*
* If @recursive is %TRUE then include parent sources. If %FALSE then
* only include the schemas from one source (ie: one directory). You
* probably want %TRUE.
*
* Non-relocatable schemas are those for which you can call
* g_settings_new(). Relocatable schemas are those for which you must
* use g_settings_new_with_path().
*
* Do not call this function from normal programs. This is designed for
* use by database editors, commandline tools, etc.
*
* Since: 2.40
**/
void
g_settings_schema_source_list_schemas (GSettingsSchemaSource *source,
gboolean recursive,
gchar ***non_relocatable,
gchar ***relocatable)
{
GHashTable *single, *reloc;
GSettingsSchemaSource *s;
/* 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 (s = source; s; s = s->parent)
{
gchar **list;
gint i;
list = gvdb_table_list (s->table, "");
/* empty schema cache file? */
if (list == NULL)
continue;
for (i = 0; list[i]; i++)
{
if (!g_hash_table_contains (single, list[i]) &&
!g_hash_table_contains (reloc, list[i]))
{
gchar *schema;
GvdbTable *table;
schema = g_strdup (list[i]);
table = gvdb_table_get_table (s->table, list[i]);
g_assert (table != NULL);
if (gvdb_table_has_value (table, ".path"))
g_hash_table_add (single, schema);
else
g_hash_table_add (reloc, schema);
gvdb_table_free (table);
}
}
g_strfreev (list);
/* Only the first source if recursive not requested */
if (!recursive)
break;
}
if (non_relocatable)
{
*non_relocatable = (gchar **) g_hash_table_get_keys_as_array (single, NULL);
g_hash_table_steal_all (single);
}
if (relocatable)
{
*relocatable = (gchar **) g_hash_table_get_keys_as_array (reloc, NULL);
g_hash_table_steal_all (reloc);
}
g_hash_table_unref (single);
g_hash_table_unref (reloc);
}
static gchar **non_relocatable_schema_list;
static gchar **relocatable_schema_list;
static gsize schema_lists_initialised;
static void
ensure_schema_lists (void)
{
if (g_once_init_enter (&schema_lists_initialised))
{
initialise_schema_sources ();
g_settings_schema_source_list_schemas (schema_sources, TRUE,
&non_relocatable_schema_list,
&relocatable_schema_list);
g_once_init_leave (&schema_lists_initialised, TRUE);
}
}
/**
* g_settings_list_schemas:
*
* Deprecated.
*
* Returns: (element-type utf8) (transfer none): a list of #GSettings
* schemas that are available, in no defined order. The list must not be
* modified or freed.
*
* Since: 2.26
*
* Deprecated: 2.40: Use g_settings_schema_source_list_schemas() instead.
* If you used g_settings_list_schemas() to check for the presence of
* a particular schema, use g_settings_schema_source_lookup() instead
* of your whole loop.
**/
const gchar * const *
g_settings_list_schemas (void)
{
ensure_schema_lists ();
return (const gchar **) non_relocatable_schema_list;
}
/**
* g_settings_list_relocatable_schemas:
*
* Deprecated.
*
* Returns: (element-type utf8) (transfer none): a list of relocatable
* #GSettings schemas that are available, in no defined order. The list must
* not be modified or freed.
*
* Since: 2.28
*
* Deprecated: 2.40: Use g_settings_schema_source_list_schemas() instead
**/
const gchar * const *
g_settings_list_relocatable_schemas (void)
{
ensure_schema_lists ();
return (const gchar **) 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
**/
GSettingsSchema *
g_settings_schema_ref (GSettingsSchema *schema)
{
g_atomic_int_inc (&schema->ref_count);
return schema;
}
/**
* g_settings_schema_unref:
* @schema: a #GSettingsSchema
*
* Decrease the reference count of @schema, possibly freeing it.
*
* Since: 2.32
**/
void
g_settings_schema_unref (GSettingsSchema *schema)
{
if (g_atomic_int_dec_and_test (&schema->ref_count))
{
if (schema->extends)
g_settings_schema_unref (schema->extends);
g_settings_schema_source_unref (schema->source);
gvdb_table_free (schema->table);
g_free (schema->items);
g_free (schema->id);
g_slice_free (GSettingsSchema, schema);
}
}
const gchar *
g_settings_schema_get_string (GSettingsSchema *schema,
const gchar *key)
{
const gchar *result = NULL;
GVariant *value;
if ((value = gvdb_table_get_raw_value (schema->table, key)))
{
result = g_variant_get_string (value, NULL);
g_variant_unref (value);
}
return result;
}
GVariantIter *
g_settings_schema_get_value (GSettingsSchema *schema,
const gchar *key)
{
GSettingsSchema *s = schema;
GVariantIter *iter;
GVariant *value = NULL;
g_return_val_if_fail (schema != NULL, NULL);
for (s = schema; s; s = s->extends)
if ((value = gvdb_table_get_raw_value (s->table, key)))
break;
if G_UNLIKELY (value == NULL || !g_variant_is_of_type (value, G_VARIANT_TYPE_TUPLE))
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;
}
/**
* 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
* therefore 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
**/
const gchar *
g_settings_schema_get_path (GSettingsSchema *schema)
{
return schema->path;
}
const gchar *
g_settings_schema_get_gettext_domain (GSettingsSchema *schema)
{
return schema->gettext_domain;
}
/**
* g_settings_schema_has_key:
* @schema: a #GSettingsSchema
* @name: the name of a key
*
* Checks if @schema has a key named @name.
*
* Returns: %TRUE if such a key exists
*
* Since: 2.40
**/
gboolean
g_settings_schema_has_key (GSettingsSchema *schema,
const gchar *key)
{
return gvdb_table_has_value (schema->table, key);
}
/**
* g_settings_schema_list_children:
* @schema: a #GSettingsSchema
*
* Gets the list of children in @schema.
*
* You should free the return value with g_strfreev() when you are done
* with it.
*
* Returns: (transfer full) (element-type utf8): a list of the children on
* @settings, in no defined order
*
* Since: 2.44
*/
gchar **
g_settings_schema_list_children (GSettingsSchema *schema)
{
const GQuark *keys;
gchar **strv;
gint n_keys;
gint i, j;
g_return_val_if_fail (schema != NULL, NULL);
keys = g_settings_schema_list (schema, &n_keys);
strv = g_new (gchar *, n_keys + 1);
for (i = j = 0; i < n_keys; i++)
{
const gchar *key = g_quark_to_string (keys[i]);
if (g_str_has_suffix (key, "/"))
{
gint length = strlen (key);
strv[j] = g_memdup (key, length);
strv[j][length - 1] = '\0';
j++;
}
}
strv[j] = NULL;
return strv;
}
/**
* g_settings_schema_list_keys:
* @schema: a #GSettingsSchema
*
* Introspects the list of keys on @schema.
*
* You should probably not be calling this function from "normal" code
* (since you should already know what keys are in your schema). This
* function is intended for introspection reasons.
*
* Returns: (transfer full) (element-type utf8): a list of the keys on
* @schema, in no defined order
*
* Since: 2.46
*/
gchar **
g_settings_schema_list_keys (GSettingsSchema *schema)
{
const GQuark *keys;
gchar **strv;
gint n_keys;
gint i, j;
g_return_val_if_fail (schema != NULL, NULL);
keys = g_settings_schema_list (schema, &n_keys);
strv = g_new (gchar *, n_keys + 1);
for (i = j = 0; i < n_keys; i++)
{
const gchar *key = g_quark_to_string (keys[i]);
if (!g_str_has_suffix (key, "/"))
strv[j++] = g_strdup (key);
}
strv[j] = NULL;
return strv;
}
const GQuark *
g_settings_schema_list (GSettingsSchema *schema,
gint *n_items)
{
if (schema->items == NULL)
{
GSettingsSchema *s;
GHashTableIter iter;
GHashTable *items;
gpointer name;
gint len;
gint i;
items = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
for (s = schema; s; s = s->extends)
{
gchar **list;
list = gvdb_table_list (s->table, "");
if (list)
{
for (i = 0; list[i]; i++)
g_hash_table_add (items, list[i]); /* transfer ownership */
g_free (list); /* free container only */
}
}
/* Do a first pass to eliminate child items that do not map to
* valid schemas (ie: ones that would crash us if we actually
* tried to create them).
*/
g_hash_table_iter_init (&iter, items);
while (g_hash_table_iter_next (&iter, &name, NULL))
if (g_str_has_suffix (name, "/"))
{
GSettingsSchemaSource *source;
GVariant *child_schema;
GvdbTable *child_table;
child_schema = gvdb_table_get_raw_value (schema->table, name);
if (!child_schema)
continue;
child_table = NULL;
for (source = schema->source; source; source = source->parent)
if ((child_table = gvdb_table_get_table (source->table, g_variant_get_string (child_schema, NULL))))
break;
g_variant_unref (child_schema);
/* Schema is not found -> remove it from the list */
if (child_table == NULL)
{
g_hash_table_iter_remove (&iter);
continue;
}
/* Make sure the schema is relocatable or at the
* expected path
*/
if (gvdb_table_has_value (child_table, ".path"))
{
GVariant *path;
gchar *expected;
gboolean same;
path = gvdb_table_get_raw_value (child_table, ".path");
expected = g_strconcat (schema->path, name, NULL);
same = g_str_equal (expected, g_variant_get_string (path, NULL));
g_variant_unref (path);
g_free (expected);
/* Schema is non-relocatable and did not have the
* expected path -> remove it from the list
*/
if (!same)
g_hash_table_iter_remove (&iter);
}
gvdb_table_free (child_table);
}
/* Now create the list */
len = g_hash_table_size (items);
schema->items = g_new (GQuark, len);
i = 0;
g_hash_table_iter_init (&iter, items);
while (g_hash_table_iter_next (&iter, &name, NULL))
schema->items[i++] = g_quark_from_string (name);
schema->n_items = i;
g_assert (i == len);
g_hash_table_unref (items);
}
*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;
case 'd':
g_variant_get (data, "@a{sv}", &key->desktop_overrides);
endian_fixup (&key->desktop_overrides);
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);
if (key->desktop_overrides)
g_variant_unref (key->desktop_overrides);
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);
}
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", translated, 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;
}
GVariant *
g_settings_schema_key_get_per_desktop_default (GSettingsSchemaKey *key)
{
static const gchar * const *current_desktops;
GVariant *value = NULL;
gint i;
if (!key->desktop_overrides)
return NULL;
if (g_once_init_enter (&current_desktops))
{
const gchar *xdg_current_desktop = g_getenv ("XDG_CURRENT_DESKTOP");
gchar **tmp;
if (xdg_current_desktop != NULL && xdg_current_desktop[0] != '\0')
tmp = g_strsplit (xdg_current_desktop, G_SEARCHPATH_SEPARATOR_S, -1);
else
tmp = g_new0 (gchar *, 0 + 1);
g_once_init_leave (&current_desktops, (const gchar **) tmp);
}
for (i = 0; value == NULL && current_desktops[i] != NULL; i++)
value = g_variant_lookup_value (key->desktop_overrides, current_desktops[i], NULL);
return value;
}
gint
g_settings_schema_key_to_enum (GSettingsSchemaKey *key,
GVariant *value)
{
gboolean it_worked G_GNUC_UNUSED /* when compiling with G_DISABLE_ASSERT */;
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;
}
/* Returns a new floating #GVariant. */
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 G_GNUC_UNUSED /* when compiling with G_DISABLE_ASSERT */;
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;
}
/* Returns a new floating #GVariant. */
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);
}
G_DEFINE_BOXED_TYPE (GSettingsSchemaKey, g_settings_schema_key, g_settings_schema_key_ref, g_settings_schema_key_unref)
/**
* g_settings_schema_key_ref:
* @key: a #GSettingsSchemaKey
*
* Increase the reference count of @key, returning a new reference.
*
* Returns: a new reference to @key
*
* Since: 2.40
**/
GSettingsSchemaKey *
g_settings_schema_key_ref (GSettingsSchemaKey *key)
{
g_return_val_if_fail (key != NULL, NULL);
g_atomic_int_inc (&key->ref_count);
return key;
}
/**
* g_settings_schema_key_unref:
* @key: a #GSettingsSchemaKey
*
* Decrease the reference count of @key, possibly freeing it.
*
* Since: 2.40
**/
void
g_settings_schema_key_unref (GSettingsSchemaKey *key)
{
g_return_if_fail (key != NULL);
if (g_atomic_int_dec_and_test (&key->ref_count))
{
g_settings_schema_key_clear (key);
g_slice_free (GSettingsSchemaKey, key);
}
}
/**
* g_settings_schema_get_key:
* @schema: a #GSettingsSchema
* @name: the name of a key
*
* Gets the key named @name from @schema.
*
* It is a programmer error to request a key that does not exist. See
* g_settings_schema_list_keys().
*
* Returns: (transfer full): the #GSettingsSchemaKey for @name
*
* Since: 2.40
**/
GSettingsSchemaKey *
g_settings_schema_get_key (GSettingsSchema *schema,
const gchar *name)
{
GSettingsSchemaKey *key;
g_return_val_if_fail (schema != NULL, NULL);
g_return_val_if_fail (name != NULL, NULL);
key = g_slice_new (GSettingsSchemaKey);
g_settings_schema_key_init (key, schema, name);
key->ref_count = 1;
return key;
}
/**
* g_settings_schema_key_get_name:
* @key: a #GSettingsSchemaKey
*
* Gets the name of @key.
*
* Returns: the name of @key.
*
* Since: 2.44
*/
const gchar *
g_settings_schema_key_get_name (GSettingsSchemaKey *key)
{
g_return_val_if_fail (key != NULL, NULL);
return key->name;
}
/**
* g_settings_schema_key_get_summary:
* @key: a #GSettingsSchemaKey
*
* Gets the summary for @key.
*
* If no summary has been provided in the schema for @key, returns
* %NULL.
*
* The summary is a short description of the purpose of the key; usually
* one short sentence. Summaries can be translated and the value
* returned from this function is is the current locale.
*
* This function is slow. The summary and description information for
* the schemas is not stored in the compiled schema database so this
* function has to parse all of the source XML files in the schema
* directory.
*
* Returns: the summary for @key, or %NULL
*
* Since: 2.34
**/
const gchar *
g_settings_schema_key_get_summary (GSettingsSchemaKey *key)
{
GHashTable **text_tables;
GHashTable *summaries;
text_tables = g_settings_schema_source_get_text_tables (key->schema->source);
summaries = g_hash_table_lookup (text_tables[0], key->schema->id);
return summaries ? g_hash_table_lookup (summaries, key->name) : NULL;
}
/**
* g_settings_schema_key_get_description:
* @key: a #GSettingsSchemaKey
*
* Gets the description for @key.
*
* If no description has been provided in the schema for @key, returns
* %NULL.
*
* The description can be one sentence to several paragraphs in length.
* Paragraphs are delimited with a double newline. Descriptions can be
* translated and the value returned from this function is is the
* current locale.
*
* This function is slow. The summary and description information for
* the schemas is not stored in the compiled schema database so this
* function has to parse all of the source XML files in the schema
* directory.
*
* Returns: the description for @key, or %NULL
*
* Since: 2.34
**/
const gchar *
g_settings_schema_key_get_description (GSettingsSchemaKey *key)
{
GHashTable **text_tables;
GHashTable *descriptions;
text_tables = g_settings_schema_source_get_text_tables (key->schema->source);
descriptions = g_hash_table_lookup (text_tables[1], key->schema->id);
return descriptions ? g_hash_table_lookup (descriptions, key->name) : NULL;
}
/**
* g_settings_schema_key_get_value_type:
* @key: a #GSettingsSchemaKey
*
* Gets the #GVariantType of @key.
*
* Returns: (transfer none): the type of @key
*
* Since: 2.40
**/
const GVariantType *
g_settings_schema_key_get_value_type (GSettingsSchemaKey *key)
{
g_return_val_if_fail (key, NULL);
return key->type;
}
/**
* g_settings_schema_key_get_default_value:
* @key: a #GSettingsSchemaKey
*
* Gets the default value for @key.
*
* Note that this is the default value according to the schema. System
* administrator defaults and lockdown are not visible via this API.
*
* Returns: (transfer full): the default value for the key
*
* Since: 2.40
**/
GVariant *
g_settings_schema_key_get_default_value (GSettingsSchemaKey *key)
{
GVariant *value;
g_return_val_if_fail (key, NULL);
value = g_settings_schema_key_get_translated_default (key);
if (!value)
value = g_settings_schema_key_get_per_desktop_default (key);
if (!value)
value = g_variant_ref (key->default_value);
return value;
}
/**
* g_settings_schema_key_get_range:
* @key: a #GSettingsSchemaKey
*
* Queries the range of a key.
*
* This function will return a #GVariant that fully describes the range
* of values that are valid for @key.
*
* The type of #GVariant returned is `(sv)`. The string describes
* the type of range restriction in effect. The type and meaning of
* the value contained in the variant depends on the string.
*
* If the string is `'type'` then the variant contains an empty array.
* The element type of that empty array is the expected type of value
* and all values of that type are valid.
*
* If the string is `'enum'` then the variant contains an array
* enumerating the possible values. Each item in the array is
* a possible valid value and no other values are valid.
*
* If the string is `'flags'` then the variant contains an array. Each
* item in the array is a value that may appear zero or one times in an
* array to be used as the value for this key. For example, if the
* variant contained the array `['x', 'y']` then the valid values for
* the key would be `[]`, `['x']`, `['y']`, `['x', 'y']` and
* `['y', 'x']`.
*
* Finally, if the string is `'range'` then the variant contains a pair
* of like-typed values -- the minimum and maximum permissible values
* for this key.
*
* This information should not be used by normal programs. It is
* considered to be a hint for introspection purposes. Normal programs
* should already know what is permitted by their own schema. The
* format may change in any way in the future -- but particularly, new
* forms may be added to the possibilities described above.
*
* You should free the returned value with g_variant_unref() when it is
* no longer needed.
*
* Returns: (transfer full): a #GVariant describing the range
*
* Since: 2.40
**/
GVariant *
g_settings_schema_key_get_range (GSettingsSchemaKey *key)
{
const gchar *type;
GVariant *range;
if (key->minimum)
{
range = g_variant_new ("(**)", key->minimum, key->maximum);
type = "range";
}
else if (key->strinfo)
{
range = strinfo_enumerate (key->strinfo, key->strinfo_length);
type = key->is_flags ? "flags" : "enum";
}
else
{
range = g_variant_new_array (key->type, NULL, 0);
type = "type";
}
return g_variant_ref_sink (g_variant_new ("(sv)", type, range));
}
/**
* g_settings_schema_key_range_check:
* @key: a #GSettingsSchemaKey
* @value: the value to check
*
* Checks if the given @value is of the correct type and within the
* permitted range for @key.
*
* It is a programmer error if @value is not of the correct type -- you
* must check for this first.
*
* Returns: %TRUE if @value is valid for @key
*
* Since: 2.40
**/
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));
}
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