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PIKApp/libpikaconfig/pikaconfig-iface.c

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/* LIBPIKA - The PIKA Library
* Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
*
* Config file serialization and deserialization interface
* Copyright (C) 2001-2002 Sven Neumann <sven@gimp.org>
*
* 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 3 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
* Library 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
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gio/gio.h>
#include "libpikabase/pikabase.h"
#include "pikaconfigtypes.h"
#include "pikaconfigwriter.h"
#include "pikaconfig-iface.h"
#include "pikaconfig-deserialize.h"
#include "pikaconfig-serialize.h"
#include "pikaconfig-params.h"
#include "pikaconfig-utils.h"
#include "pikascanner.h"
#include "libpika/libpika-intl.h"
/*
* PikaConfigIface:
*
* The [struct@Config] serialization and deserialization interface.
*/
/* local function prototypes */
static void pika_config_iface_default_init (PikaConfigInterface *iface);
static void pika_config_iface_base_init (PikaConfigInterface *iface);
static gboolean pika_config_iface_serialize (PikaConfig *config,
PikaConfigWriter *writer,
gpointer data);
static gboolean pika_config_iface_deserialize (PikaConfig *config,
GScanner *scanner,
gint nest_level,
gpointer data);
static PikaConfig * pika_config_iface_duplicate (PikaConfig *config);
static gboolean pika_config_iface_equal (PikaConfig *a,
PikaConfig *b);
static void pika_config_iface_reset (PikaConfig *config);
static gboolean pika_config_iface_copy (PikaConfig *src,
PikaConfig *dest,
GParamFlags flags);
/* private functions */
GType
pika_config_get_type (void)
{
static GType config_iface_type = 0;
if (! config_iface_type)
{
const GTypeInfo config_iface_info =
{
sizeof (PikaConfigInterface),
(GBaseInitFunc) pika_config_iface_base_init,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) pika_config_iface_default_init,
(GClassFinalizeFunc) NULL,
};
config_iface_type = g_type_register_static (G_TYPE_INTERFACE,
"PikaConfigInterface",
&config_iface_info,
0);
g_type_interface_add_prerequisite (config_iface_type, G_TYPE_OBJECT);
}
return config_iface_type;
}
static void
pika_config_iface_default_init (PikaConfigInterface *iface)
{
iface->serialize = pika_config_iface_serialize;
iface->deserialize = pika_config_iface_deserialize;
iface->duplicate = pika_config_iface_duplicate;
iface->equal = pika_config_iface_equal;
iface->reset = pika_config_iface_reset;
iface->copy = pika_config_iface_copy;
}
static void
pika_config_iface_base_init (PikaConfigInterface *iface)
{
/* always set these to NULL since we don't want to inherit them
* from parent classes
*/
iface->serialize_property = NULL;
iface->deserialize_property = NULL;
}
static gboolean
pika_config_iface_serialize (PikaConfig *config,
PikaConfigWriter *writer,
gpointer data)
{
return pika_config_serialize_properties (config, writer);
}
static gboolean
pika_config_iface_deserialize (PikaConfig *config,
GScanner *scanner,
gint nest_level,
gpointer data)
{
return pika_config_deserialize_properties (config, scanner, nest_level);
}
static PikaConfig *
pika_config_iface_duplicate (PikaConfig *config)
{
GObject *object = G_OBJECT (config);
GObjectClass *klass = G_OBJECT_GET_CLASS (object);
GParamSpec **property_specs;
guint n_property_specs;
gint n_construct_properties = 0;
const gchar **construct_names = NULL;
GValue *construct_values = NULL;
guint i;
GObject *dup;
property_specs = g_object_class_list_properties (klass, &n_property_specs);
construct_names = g_new0 (const gchar *, n_property_specs);
construct_values = g_new0 (GValue, n_property_specs);
for (i = 0; i < n_property_specs; i++)
{
GParamSpec *prop_spec = property_specs[i];
if ((prop_spec->flags & G_PARAM_READABLE) &&
(prop_spec->flags & G_PARAM_WRITABLE) &&
(prop_spec->flags & G_PARAM_CONSTRUCT_ONLY))
{
construct_names[n_construct_properties] = prop_spec->name;
g_value_init (&construct_values[n_construct_properties],
prop_spec->value_type);
g_object_get_property (object, prop_spec->name,
&construct_values[n_construct_properties]);
n_construct_properties++;
}
}
g_free (property_specs);
dup = g_object_new_with_properties (G_TYPE_FROM_INSTANCE (object),
n_construct_properties,
(const gchar **) construct_names,
(const GValue *) construct_values);
for (i = 0; i < n_construct_properties; i++)
g_value_unset (&construct_values[i]);
g_free (construct_names);
g_free (construct_values);
pika_config_copy (config, PIKA_CONFIG (dup), 0);
return PIKA_CONFIG (dup);
}
static gboolean
pika_config_iface_equal (PikaConfig *a,
PikaConfig *b)
{
GObjectClass *klass;
GParamSpec **property_specs;
guint n_property_specs;
guint i;
gboolean equal = TRUE;
klass = G_OBJECT_GET_CLASS (a);
property_specs = g_object_class_list_properties (klass, &n_property_specs);
for (i = 0; equal && i < n_property_specs; i++)
{
GParamSpec *prop_spec;
GValue a_value = G_VALUE_INIT;
GValue b_value = G_VALUE_INIT;
prop_spec = property_specs[i];
if (! (prop_spec->flags & G_PARAM_READABLE) ||
(prop_spec->flags & PIKA_CONFIG_PARAM_DONT_COMPARE))
{
continue;
}
g_value_init (&a_value, prop_spec->value_type);
g_value_init (&b_value, prop_spec->value_type);
g_object_get_property (G_OBJECT (a), prop_spec->name, &a_value);
g_object_get_property (G_OBJECT (b), prop_spec->name, &b_value);
if (g_param_values_cmp (prop_spec, &a_value, &b_value))
{
if ((prop_spec->flags & PIKA_CONFIG_PARAM_AGGREGATE) &&
G_IS_PARAM_SPEC_OBJECT (prop_spec) &&
g_type_interface_peek (g_type_class_peek (prop_spec->value_type),
PIKA_TYPE_CONFIG))
{
if (! pika_config_is_equal_to (g_value_get_object (&a_value),
g_value_get_object (&b_value)))
{
equal = FALSE;
}
}
else
{
equal = FALSE;
}
}
g_value_unset (&a_value);
g_value_unset (&b_value);
}
g_free (property_specs);
return equal;
}
static void
pika_config_iface_reset (PikaConfig *config)
{
pika_config_reset_properties (G_OBJECT (config));
}
static gboolean
pika_config_iface_copy (PikaConfig *src,
PikaConfig *dest,
GParamFlags flags)
{
return pika_config_sync (G_OBJECT (src), G_OBJECT (dest), flags);
}
/* public functions */
/**
* pika_config_serialize_to_file:
* @config: an object that implements [iface@ConfigInterface].
* @file: the file to write the configuration to.
* @header: (nullable): optional file header (must be ASCII only)
* @footer: (nullable): optional file footer (must be ASCII only)
* @data: user data passed to the serialize implementation.
* @error: return location for a possible error
*
* Serializes the object properties of @config to the file specified
* by @file. If a file with that name already exists, it is
* overwritten. Basically this function opens @file for you and calls
* the serialize function of the @config's [iface@ConfigInterface].
*
* Returns: %TRUE if serialization succeeded, %FALSE otherwise.
*
* Since: 2.10
**/
gboolean
pika_config_serialize_to_file (PikaConfig *config,
GFile *file,
const gchar *header,
const gchar *footer,
gpointer data,
GError **error)
{
PikaConfigWriter *writer;
g_return_val_if_fail (PIKA_IS_CONFIG (config), FALSE);
g_return_val_if_fail (G_IS_FILE (file), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
writer = pika_config_writer_new_from_file (file, TRUE, header, error);
if (!writer)
return FALSE;
PIKA_CONFIG_GET_IFACE (config)->serialize (config, writer, data);
return pika_config_writer_finish (writer, footer, error);
}
/**
* pika_config_serialize_to_stream:
* @config: an object that implements [iface@ConfigInterface].
* @output: the #GOutputStream to write the configuration to.
* @header: (nullable): optional file header (must be ASCII only)
* @footer: (nullable): optional file footer (must be ASCII only)
* @data: user data passed to the serialize implementation.
* @error: return location for a possible error
*
* Serializes the object properties of @config to the stream specified
* by @output.
*
* Returns: Whether serialization succeeded.
*
* Since: 2.10
**/
gboolean
pika_config_serialize_to_stream (PikaConfig *config,
GOutputStream *output,
const gchar *header,
const gchar *footer,
gpointer data,
GError **error)
{
PikaConfigWriter *writer;
g_return_val_if_fail (PIKA_IS_CONFIG (config), FALSE);
g_return_val_if_fail (G_IS_OUTPUT_STREAM (output), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
writer = pika_config_writer_new_from_stream (output, header, error);
if (!writer)
return FALSE;
PIKA_CONFIG_GET_IFACE (config)->serialize (config, writer, data);
return pika_config_writer_finish (writer, footer, error);
}
/**
* pika_config_serialize_to_fd:
* @config: an object that implements [iface@ConfigInterface].
* @fd: a file descriptor, opened for writing
* @data: user data passed to the serialize implementation.
*
* Serializes the object properties of @config to the given file
* descriptor.
*
* Returns: %TRUE if serialization succeeded, %FALSE otherwise.
*
* Since: 2.4
**/
gboolean
pika_config_serialize_to_fd (PikaConfig *config,
gint fd,
gpointer data)
{
PikaConfigWriter *writer;
g_return_val_if_fail (PIKA_IS_CONFIG (config), FALSE);
g_return_val_if_fail (fd > 0, FALSE);
writer = pika_config_writer_new_from_fd (fd);
if (!writer)
return FALSE;
PIKA_CONFIG_GET_IFACE (config)->serialize (config, writer, data);
return pika_config_writer_finish (writer, NULL, NULL);
}
/**
* pika_config_serialize_to_string:
* @config: an object that implements the [iface@ConfigInterface].
* @data: user data passed to the serialize implementation.
*
* Serializes the object properties of @config to a string.
*
* Returns: a newly allocated NUL-terminated string.
*
* Since: 2.4
**/
gchar *
pika_config_serialize_to_string (PikaConfig *config,
gpointer data)
{
PikaConfigWriter *writer;
GString *str;
g_return_val_if_fail (PIKA_IS_CONFIG (config), NULL);
str = g_string_new (NULL);
writer = pika_config_writer_new_from_string (str);
PIKA_CONFIG_GET_IFACE (config)->serialize (config, writer, data);
pika_config_writer_finish (writer, NULL, NULL);
return g_string_free (str, FALSE);
}
/**
* pika_config_serialize_to_parasite:
* @config: an object that implements the [iface@ConfigInterface].
* @parasite_name: the new parasite's name
* @parasite_flags: the new parasite's flags
* @data: user data passed to the serialize implementation.
*
* Serializes the object properties of @config to a [struct@Parasite].
*
* Returns: (transfer full): the newly allocated parasite.
*
* Since: 3.0
**/
PikaParasite *
pika_config_serialize_to_parasite (PikaConfig *config,
const gchar *parasite_name,
guint parasite_flags,
gpointer data)
{
PikaParasite *parasite;
gchar *str;
g_return_val_if_fail (PIKA_IS_CONFIG (config), NULL);
g_return_val_if_fail (parasite_name != NULL, NULL);
str = pika_config_serialize_to_string (config, data);
if (! str)
return NULL;
parasite = pika_parasite_new (parasite_name,
parasite_flags,
0, NULL);
parasite->size = strlen (str) + 1;
parasite->data = str;
return parasite;
}
/**
* pika_config_deserialize_file:
* @config: an object that implements the #PikaConfigInterface.
* @file: the file to read configuration from.
* @data: user data passed to the deserialize implementation.
* @error: return location for a possible error
*
* Opens the file specified by @file, reads configuration data from it
* and configures @config accordingly. Basically this function creates
* a properly configured [struct@GLib.Scanner] for you and calls the deserialize
* function of the @config's [iface@ConfigInterface].
*
* Returns: Whether deserialization succeeded.
*
* Since: 2.10
**/
gboolean
pika_config_deserialize_file (PikaConfig *config,
GFile *file,
gpointer data,
GError **error)
{
GScanner *scanner;
gboolean success;
g_return_val_if_fail (PIKA_IS_CONFIG (config), FALSE);
g_return_val_if_fail (G_IS_FILE (file), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
scanner = pika_scanner_new_file (file, error);
if (! scanner)
return FALSE;
g_object_freeze_notify (G_OBJECT (config));
success = PIKA_CONFIG_GET_IFACE (config)->deserialize (config,
scanner, 0, data);
g_object_thaw_notify (G_OBJECT (config));
pika_scanner_unref (scanner);
if (! success)
/* If we get this assert, it means we have a bug in one of the
* deserialize() implementations. Any failure case should report the
* error condition with g_scanner_error() which will populate the
* error object passed in pika_scanner_new*().
*/
g_assert (error == NULL || *error != NULL);
return success;
}
/**
* pika_config_deserialize_stream:
* @config: an object that implements the #PikaConfigInterface.
* @input: the input stream to read configuration from.
* @data: user data passed to the deserialize implementation.
* @error: return location for a possible error
*
* Reads configuration data from @input and configures @config
* accordingly. Basically this function creates a properly configured
* #GScanner for you and calls the deserialize function of the
* @config's #PikaConfigInterface.
*
* Returns: Whether deserialization succeeded.
*
* Since: 2.10
**/
gboolean
pika_config_deserialize_stream (PikaConfig *config,
GInputStream *input,
gpointer data,
GError **error)
{
GScanner *scanner;
gboolean success;
g_return_val_if_fail (PIKA_IS_CONFIG (config), FALSE);
g_return_val_if_fail (G_IS_INPUT_STREAM (input), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
scanner = pika_scanner_new_stream (input, error);
if (! scanner)
return FALSE;
g_object_freeze_notify (G_OBJECT (config));
success = PIKA_CONFIG_GET_IFACE (config)->deserialize (config,
scanner, 0, data);
g_object_thaw_notify (G_OBJECT (config));
pika_scanner_unref (scanner);
if (! success)
g_assert (error == NULL || *error != NULL);
return success;
}
/**
* pika_config_deserialize_string:
* @config: a #GObject that implements the #PikaConfigInterface.
* @text: (array length=text_len): string to deserialize (in UTF-8 encoding)
* @text_len: length of @text in bytes or -1
* @data: client data
* @error: return location for a possible error
*
* Configures @config from @text. Basically this function creates a
* properly configured #GScanner for you and calls the deserialize
* function of the @config's #PikaConfigInterface.
*
* Returns: %TRUE if deserialization succeeded, %FALSE otherwise.
*
* Since: 2.4
**/
gboolean
pika_config_deserialize_string (PikaConfig *config,
const gchar *text,
gint text_len,
gpointer data,
GError **error)
{
GScanner *scanner;
gboolean success;
g_return_val_if_fail (PIKA_IS_CONFIG (config), FALSE);
g_return_val_if_fail (text != NULL || text_len == 0, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
scanner = pika_scanner_new_string (text, text_len, error);
g_object_freeze_notify (G_OBJECT (config));
success = PIKA_CONFIG_GET_IFACE (config)->deserialize (config,
scanner, 0, data);
g_object_thaw_notify (G_OBJECT (config));
pika_scanner_unref (scanner);
if (! success)
g_assert (error == NULL || *error != NULL);
return success;
}
/**
* pika_config_deserialize_parasite:
* @config: a #GObject that implements the #PikaConfigInterface.
* @parasite: parasite containing a serialized config string
* @data: client data
* @error: return location for a possible error
*
* Configures @config from @parasite. Basically this function creates
* a properly configured #GScanner for you and calls the deserialize
* function of the @config's #PikaConfigInterface.
*
* Returns: %TRUE if deserialization succeeded, %FALSE otherwise.
*
* Since: 3.0
**/
gboolean
pika_config_deserialize_parasite (PikaConfig *config,
const PikaParasite *parasite,
gpointer data,
GError **error)
{
const gchar *parasite_data;
guint32 parasite_size;
g_return_val_if_fail (PIKA_IS_CONFIG (config), FALSE);
g_return_val_if_fail (parasite != NULL, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
parasite_data = pika_parasite_get_data (parasite, &parasite_size);
if (! parasite_data)
return TRUE;
return pika_config_deserialize_string (config, parasite_data, parasite_size,
data, error);
}
/**
* pika_config_deserialize_return:
* @scanner: a #GScanner
* @expected_token: the expected token
* @nest_level: the nest level
*
* Returns:
*
* Since: 2.4
**/
gboolean
pika_config_deserialize_return (GScanner *scanner,
GTokenType expected_token,
gint nest_level)
{
GTokenType next_token;
g_return_val_if_fail (scanner != NULL, FALSE);
next_token = g_scanner_peek_next_token (scanner);
if (expected_token != G_TOKEN_LEFT_PAREN)
{
g_scanner_get_next_token (scanner);
g_scanner_unexp_token (scanner, expected_token, NULL, NULL, NULL,
_("fatal parse error"), TRUE);
return FALSE;
}
else
{
if (nest_level > 0 && next_token == G_TOKEN_RIGHT_PAREN)
{
return TRUE;
}
else if (next_token != G_TOKEN_EOF)
{
g_scanner_get_next_token (scanner);
g_scanner_unexp_token (scanner, expected_token, NULL, NULL, NULL,
_("fatal parse error"), TRUE);
return FALSE;
}
}
return TRUE;
}
/**
* pika_config_serialize:
* @config: an object that implements the #PikaConfigInterface.
* @writer: the #PikaConfigWriter to use.
* @data: client data
*
* Serialize the #PikaConfig object.
*
* Returns: Whether serialization succeeded.
*
* Since: 2.8
**/
gboolean
pika_config_serialize (PikaConfig *config,
PikaConfigWriter *writer,
gpointer data)
{
g_return_val_if_fail (PIKA_IS_CONFIG (config), FALSE);
return PIKA_CONFIG_GET_IFACE (config)->serialize (config, writer, data);
}
/**
* pika_config_deserialize:
* @config: a #GObject that implements the #PikaConfigInterface.
* @scanner: the #GScanner to use.
* @nest_level: the nest level.
* @data: client data.
*
* Deserialize the #PikaConfig object.
*
* Returns: Whether serialization succeeded.
*
* Since: 2.8
**/
gboolean
pika_config_deserialize (PikaConfig *config,
GScanner *scanner,
gint nest_level,
gpointer data)
{
g_return_val_if_fail (PIKA_IS_CONFIG (config), FALSE);
return PIKA_CONFIG_GET_IFACE (config)->deserialize (config,
scanner,
nest_level,
data);
}
/**
* pika_config_duplicate:
* @config: a #GObject that implements the #PikaConfigInterface.
*
* Creates a copy of the passed object by copying all object
* properties. The default implementation of the #PikaConfigInterface
* only works for objects that are completely defined by their
* properties.
*
* Returns: the duplicated #PikaConfig object
*
* Since: 2.4
**/
gpointer
pika_config_duplicate (PikaConfig *config)
{
g_return_val_if_fail (PIKA_IS_CONFIG (config), NULL);
return PIKA_CONFIG_GET_IFACE (config)->duplicate (config);
}
/**
* pika_config_is_equal_to:
* @a: a #GObject that implements the #PikaConfigInterface.
* @b: another #GObject of the same type as @a.
*
* Compares the two objects. The default implementation of the
* #PikaConfigInterface compares the object properties and thus only
* works for objects that are completely defined by their
* properties.
*
* Returns: %TRUE if the two objects are equal.
*
* Since: 2.4
**/
gboolean
pika_config_is_equal_to (PikaConfig *a,
PikaConfig *b)
{
g_return_val_if_fail (PIKA_IS_CONFIG (a), FALSE);
g_return_val_if_fail (PIKA_IS_CONFIG (b), FALSE);
g_return_val_if_fail (G_TYPE_FROM_INSTANCE (a) == G_TYPE_FROM_INSTANCE (b),
FALSE);
return PIKA_CONFIG_GET_IFACE (a)->equal (a, b);
}
/**
* pika_config_reset:
* @config: a #GObject that implements the #PikaConfigInterface.
*
* Resets the object to its default state. The default implementation of the
* #PikaConfigInterface only works for objects that are completely defined by
* their properties.
*
* Since: 2.4
**/
void
pika_config_reset (PikaConfig *config)
{
g_return_if_fail (PIKA_IS_CONFIG (config));
g_object_freeze_notify (G_OBJECT (config));
PIKA_CONFIG_GET_IFACE (config)->reset (config);
g_object_thaw_notify (G_OBJECT (config));
}
/**
* pika_config_copy:
* @src: a #GObject that implements the #PikaConfigInterface.
* @dest: another #GObject of the same type as @a.
* @flags: a mask of GParamFlags
*
* Compares all read- and write-able properties from @src and @dest
* that have all @flags set. Differing values are then copied from
* @src to @dest. If @flags is 0, all differing read/write properties.
*
* Properties marked as "construct-only" are not touched.
*
* Returns: %TRUE if @dest was modified, %FALSE otherwise
*
* Since: 2.6
**/
gboolean
pika_config_copy (PikaConfig *src,
PikaConfig *dest,
GParamFlags flags)
{
gboolean changed;
g_return_val_if_fail (PIKA_IS_CONFIG (src), FALSE);
g_return_val_if_fail (PIKA_IS_CONFIG (dest), FALSE);
g_return_val_if_fail (G_TYPE_FROM_INSTANCE (src) == G_TYPE_FROM_INSTANCE (dest),
FALSE);
g_object_freeze_notify (G_OBJECT (dest));
changed = PIKA_CONFIG_GET_IFACE (src)->copy (src, dest, flags);
g_object_thaw_notify (G_OBJECT (dest));
return changed;
}
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