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/* vim: set ts=8 sw=8 noexpandtab: */
/* The Cairo CSS Drawing Library.
* Copyright (C) 2008 Robert Staudinger
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include <gmodule.h>
#include <ccss/ccss-property-impl.h>
#include "ccss-cairo-appearance.h"
#include "ccss-cairo-appearance-parser.h"
#include "config.h"
typedef char const *
(*ccss_appearance_module_get_interface_version) (void);
static GHashTable *_module_hash = NULL;
static ccss_cairo_appearance_module_t *
module_create (char const *name)
{
char *module_path;
ccss_cairo_appearance_module_t *module = NULL;
if (NULL == _module_hash) {
_module_hash = g_hash_table_new (g_str_hash, g_str_equal);
}
module_path = g_module_build_path (CCSS_CAIRO_APPEARANCE_MODULE_PATH,
name);
/* Return module path from hash. */
module = g_hash_table_lookup (_module_hash, module_path);
if (module) {
module->reference_count++;
} else {
GModule *gmodule = g_module_open (module_path,
G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
if (gmodule) {
/* Check version. */
ccss_appearance_module_get_interface_version get_version = NULL;
bool ret = g_module_symbol (gmodule,
"ccss_appearance_module_get_interface_version",
(gpointer *) &get_version);
if (ret && get_version) {
char const *version = get_version ();
if (0 == g_strcmp0 (version, CCSS_CAIRO_APPEARANCE_MODULE_INTERFACE_VERSION)) {
module = g_new0 (ccss_cairo_appearance_module_t, 1);
module->reference_count = 1;
module->module_path = g_strdup (module_path);
module->module = gmodule;
} else {
g_debug ("%s : skipping module '%s' with version '%s' (require '%s')",
G_STRLOC,
module_path,
version,
CCSS_CAIRO_APPEARANCE_MODULE_INTERFACE_VERSION);
}
} else {
g_critical ("%s : failed to look up symbol '%s' of module '%s'",
G_STRLOC,
"ccss_appearance_module_get_interface_version",
module_path);
}
} else {
g_critical ("%s : could not open module '%s'",
G_STRLOC,
module_path);
}
if (module) {
/* Return module path from hash. */
g_hash_table_insert (_module_hash,
module->module_path,
module);
}
}
g_free (module_path), module_path = NULL;
return module;
}
static void
module_destroy (ccss_cairo_appearance_module_t *module)
{
module->reference_count--;
if (module->reference_count == 0) {
g_hash_table_remove (_module_hash, module->module_path);
g_free (module->module_path);
g_module_close (module->module);
g_free (module);
if (g_hash_table_size (_module_hash) == 0) {
g_hash_table_destroy (_module_hash);
_module_hash = NULL;
}
}
}
static ccss_cairo_appearance_draw_f
module_get_symbol (ccss_cairo_appearance_module_t const *module,
char const *name)
{
ccss_cairo_appearance_draw_f draw_func = NULL;
g_return_val_if_fail (module, NULL);
g_return_val_if_fail (name, NULL);
g_module_symbol (module->module, name, (gpointer *) &draw_func);
return draw_func;
}
static ccss_property_class_t const *
peek_property_class (void);
static bool
appearance_factory (ccss_grammar_t const *grammar,
ccss_block_t *self,
char const *name,
CRTerm const *values,
void *user_data)
{
CRTerm const *iter;
ccss_cairo_appearance_t *appearance;
ccss_cairo_appearance_t a;
ccss_property_init (&a.base, peek_property_class ());
iter = values;
if (iter->type == TERM_IDENT) {
a.appearance = g_strdup (cr_string_peek_raw_str (iter->content.str));
} else {
return false;
}
iter = iter->next;
if (iter->type == TERM_IDENT) {
char const *module_name = cr_string_peek_raw_str (iter->content.str);
a.module = module_create (module_name);
a.draw_function = module_get_symbol (a.module, a.appearance);
}
if (a.module && !a.draw_function) {
module_destroy (a.module);
a.module = NULL;
}
a.base.state = CCSS_PROPERTY_STATE_SET;
appearance = g_new0 (ccss_cairo_appearance_t, 1);
*appearance = a;
ccss_block_add_property (self, name, &appearance->base);
return true;
}
static bool
appearance_convert (ccss_cairo_appearance_t const *property,
ccss_property_type_t target,
void *value)
{
char *ret;
g_return_val_if_fail (property && value, false);
if (CCSS_PROPERTY_TYPE_DOUBLE == target)
return false;
if (property->module) {
ret = g_strdup_printf ("%s \"%s\"",
property->appearance,
property->module->module_path);
} else {
ret = g_strdup (property->appearance);
}
* (char **) value = ret;
return true;
}
static void
appearance_destroy (ccss_cairo_appearance_t *self)
{
g_free (self->appearance);
if (self->module) {
module_destroy (self->module);
}
g_free (self);
}
static ccss_property_class_t const _ptable[] = {
{
.name = "ccss-appearance",
.create = NULL,
.destroy = (ccss_property_destroy_f) appearance_destroy,
.convert = (ccss_property_convert_f) appearance_convert,
.factory = appearance_factory,
.inherit = NULL,
.serialize = NULL
}, {
.name = NULL
}
};
static ccss_property_class_t const *
peek_property_class (void)
{
return &_ptable[0];
}
ccss_property_class_t const *
ccss_cairo_appearance_parser_get_property_classes (void)
{
return _ptable;
}
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