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gtk2/gtk/gtkcssprovider.c
Matthias Clasen c31eadc3a1 css provider: Make not subclassable 
Part of being more explicit about what
we allow to be subclassed and what not.
2019-05-19 18:41:33 +00:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.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 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtkcssproviderprivate.h"
#include "gtkbitmaskprivate.h"
#include "gtkcssarrayvalueprivate.h"
#include "gtkcsscolorvalueprivate.h"
#include "gtkcsskeyframesprivate.h"
#include "gtkcssparserprivate.h"
#include "gtkcssselectorprivate.h"
#include "gtkcssshorthandpropertyprivate.h"
#include "gtksettingsprivate.h"
#include "gtkstyleprovider.h"
#include "gtkstylecontextprivate.h"
#include "gtkstylepropertyprivate.h"
#include "gtkstyleproviderprivate.h"
#include "gtkwidgetpath.h"
#include "gtkbindings.h"
#include "gtkmarshalers.h"
#include "gtkprivate.h"
#include "gtkintl.h"
#include "gtkversion.h"
#include <string.h>
#include <stdlib.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <cairo-gobject.h>
/**
* SECTION:gtkcssprovider
* @Short_description: CSS-like styling for widgets
* @Title: GtkCssProvider
* @See_also: #GtkStyleContext, #GtkStyleProvider
*
* GtkCssProvider is an object implementing the #GtkStyleProvider interface.
* It is able to parse [CSS-like][css-overview] input in order to style widgets.
*
* An application can make GTK+ parse a specific CSS style sheet by calling
* gtk_css_provider_load_from_file() or gtk_css_provider_load_from_resource()
* and adding the provider with gtk_style_context_add_provider() or
* gtk_style_context_add_provider_for_display().
* In addition, certain files will be read when GTK+ is initialized. First, the
* file `$XDG_CONFIG_HOME/gtk-4.0/gtk.css` is loaded if it exists. Then, GTK+
* loads the first existing file among
* `XDG_DATA_HOME/themes/THEME/gtk-VERSION/gtk-VARIANT.css`,
* `$HOME/.themes/THEME/gtk-VERSION/gtk-VARIANT.css`,
* `$XDG_DATA_DIRS/themes/THEME/gtk-VERSION/gtk-VARIANT.css` and
* `DATADIR/share/themes/THEME/gtk-VERSION/gtk-VARIANT.css`, where `THEME` is the name of
* the current theme (see the #GtkSettings:gtk-theme-name setting),
* VARIANT is the variant to load (see the #GtkSettings:gtk-application-prefer-dark-theme setting), `DATADIR`
* is the prefix configured when GTK+ was compiled (unless overridden by the
* `GTK_DATA_PREFIX` environment variable), and `VERSION` is the GTK+ version number.
* If no file is found for the current version, GTK+ tries older versions all the
* way back to 4.0.
*/
struct _GtkCssProviderClass
{
GObjectClass parent_class;
void (* parsing_error) (GtkCssProvider *provider,
GtkCssSection *section,
const GError * error);
};
typedef struct GtkCssRuleset GtkCssRuleset;
typedef struct _GtkCssScanner GtkCssScanner;
typedef struct _PropertyValue PropertyValue;
typedef enum ParserScope ParserScope;
typedef enum ParserSymbol ParserSymbol;
struct _PropertyValue {
GtkCssStyleProperty *property;
GtkCssValue *value;
GtkCssSection *section;
};
struct GtkCssRuleset
{
GtkCssSelector *selector;
GtkCssSelectorTree *selector_match;
PropertyValue *styles;
GtkBitmask *set_styles;
guint n_styles;
guint owns_styles : 1;
};
struct _GtkCssScanner
{
GtkCssProvider *provider;
GtkCssParser *parser;
GtkCssScanner *parent;
GSList *state;
};
struct _GtkCssProviderPrivate
{
GScanner *scanner;
GHashTable *symbolic_colors;
GHashTable *keyframes;
GArray *rulesets;
GtkCssSelectorTree *tree;
GResource *resource;
gchar *path;
};
enum {
PARSING_ERROR,
LAST_SIGNAL
};
static gboolean gtk_keep_css_sections = FALSE;
static guint css_provider_signals[LAST_SIGNAL] = { 0 };
static void gtk_css_provider_finalize (GObject *object);
static void gtk_css_style_provider_iface_init (GtkStyleProviderInterface *iface);
static void gtk_css_style_provider_emit_error (GtkStyleProvider *provider,
GtkCssSection *section,
const GError *error);
static void
gtk_css_provider_load_internal (GtkCssProvider *css_provider,
GtkCssScanner *scanner,
GFile *file,
GBytes *bytes);
G_DEFINE_TYPE_EXTENDED (GtkCssProvider, gtk_css_provider, G_TYPE_OBJECT, 0,
G_ADD_PRIVATE (GtkCssProvider)
G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER,
gtk_css_style_provider_iface_init));
static void
gtk_css_provider_parsing_error (GtkCssProvider *provider,
GtkCssSection *section,
const GError *error)
{
/* Only emit a warning when we have no error handlers. This is our
* default handlers. And in this case erroneous CSS files are a bug
* and should be fixed.
* Note that these warnings can also be triggered by a broken theme
* that people installed from some weird location on the internets.
*/
if (!g_signal_has_handler_pending (provider,
css_provider_signals[PARSING_ERROR],
0,
TRUE))
{
char *s = gtk_css_section_to_string (section);
g_warning ("Theme parsing error: %s: %s",
s,
error->message);
g_free (s);
}
}
/* This is exported privately for use in GtkInspector.
* It is the callers responsibility to reparse the current theme.
*/
void
gtk_css_provider_set_keep_css_sections (void)
{
gtk_keep_css_sections = TRUE;
}
static void
gtk_css_provider_class_init (GtkCssProviderClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
if (g_getenv ("GTK_CSS_DEBUG"))
gtk_css_provider_set_keep_css_sections ();
/**
* GtkCssProvider::parsing-error:
* @provider: the provider that had a parsing error
* @section: section the error happened in
* @error: The parsing error
*
* Signals that a parsing error occurred. the @path, @line and @position
* describe the actual location of the error as accurately as possible.
*
* Parsing errors are never fatal, so the parsing will resume after
* the error. Errors may however cause parts of the given
* data or even all of it to not be parsed at all. So it is a useful idea
* to check that the parsing succeeds by connecting to this signal.
*
* Note that this signal may be emitted at any time as the css provider
* may opt to defer parsing parts or all of the input to a later time
* than when a loading function was called.
*/
css_provider_signals[PARSING_ERROR] =
g_signal_new (I_("parsing-error"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkCssProviderClass, parsing_error),
NULL, NULL,
_gtk_marshal_VOID__BOXED_BOXED,
G_TYPE_NONE, 2, GTK_TYPE_CSS_SECTION, G_TYPE_ERROR);
object_class->finalize = gtk_css_provider_finalize;
klass->parsing_error = gtk_css_provider_parsing_error;
}
static void
gtk_css_ruleset_init_copy (GtkCssRuleset *new,
GtkCssRuleset *ruleset,
GtkCssSelector *selector)
{
memcpy (new, ruleset, sizeof (GtkCssRuleset));
new->selector = selector;
/* First copy takes over ownership */
if (ruleset->owns_styles)
ruleset->owns_styles = FALSE;
if (new->set_styles)
new->set_styles = _gtk_bitmask_copy (new->set_styles);
}
static void
gtk_css_ruleset_clear (GtkCssRuleset *ruleset)
{
if (ruleset->owns_styles)
{
guint i;
for (i = 0; i < ruleset->n_styles; i++)
{
_gtk_css_value_unref (ruleset->styles[i].value);
ruleset->styles[i].value = NULL;
if (ruleset->styles[i].section)
gtk_css_section_unref (ruleset->styles[i].section);
}
g_free (ruleset->styles);
}
if (ruleset->set_styles)
_gtk_bitmask_free (ruleset->set_styles);
if (ruleset->selector)
_gtk_css_selector_free (ruleset->selector);
memset (ruleset, 0, sizeof (GtkCssRuleset));
}
static void
gtk_css_ruleset_add (GtkCssRuleset *ruleset,
GtkCssStyleProperty *property,
GtkCssValue *value,
GtkCssSection *section)
{
guint i;
g_return_if_fail (ruleset->owns_styles || ruleset->n_styles == 0);
if (ruleset->set_styles == NULL)
ruleset->set_styles = _gtk_bitmask_new ();
ruleset->set_styles = _gtk_bitmask_set (ruleset->set_styles,
_gtk_css_style_property_get_id (property),
TRUE);
ruleset->owns_styles = TRUE;
for (i = 0; i < ruleset->n_styles; i++)
{
if (ruleset->styles[i].property == property)
{
_gtk_css_value_unref (ruleset->styles[i].value);
ruleset->styles[i].value = NULL;
if (ruleset->styles[i].section)
gtk_css_section_unref (ruleset->styles[i].section);
break;
}
}
if (i == ruleset->n_styles)
{
ruleset->n_styles++;
ruleset->styles = g_realloc (ruleset->styles, ruleset->n_styles * sizeof (PropertyValue));
ruleset->styles[i].value = NULL;
ruleset->styles[i].property = property;
}
ruleset->styles[i].value = value;
if (gtk_keep_css_sections)
ruleset->styles[i].section = gtk_css_section_ref (section);
else
ruleset->styles[i].section = NULL;
}
static void
gtk_css_scanner_destroy (GtkCssScanner *scanner)
{
g_object_unref (scanner->provider);
gtk_css_parser_unref (scanner->parser);
g_slice_free (GtkCssScanner, scanner);
}
static void
gtk_css_style_provider_emit_error (GtkStyleProvider *provider,
GtkCssSection *section,
const GError *error)
{
g_signal_emit (provider, css_provider_signals[PARSING_ERROR], 0, section, error);
}
static void
gtk_css_scanner_parser_error (GtkCssParser *parser,
const GtkCssLocation *start,
const GtkCssLocation *end,
const GError *error,
gpointer user_data)
{
GtkCssScanner *scanner = user_data;
GtkCssSection *section;
section = gtk_css_section_new (gtk_css_parser_get_file (parser),
start,
end);
gtk_css_style_provider_emit_error (GTK_STYLE_PROVIDER (scanner->provider), section, error);
gtk_css_section_unref (section);
}
static GtkCssScanner *
gtk_css_scanner_new (GtkCssProvider *provider,
GtkCssScanner *parent,
GFile *file,
GBytes *bytes)
{
GtkCssScanner *scanner;
scanner = g_slice_new0 (GtkCssScanner);
g_object_ref (provider);
scanner->provider = provider;
scanner->parent = parent;
scanner->parser = gtk_css_parser_new_for_bytes (bytes,
file,
NULL,
gtk_css_scanner_parser_error,
scanner,
NULL);
return scanner;
}
static gboolean
gtk_css_scanner_would_recurse (GtkCssScanner *scanner,
GFile *file)
{
while (scanner)
{
GFile *parser_file = gtk_css_parser_get_file (scanner->parser);
if (parser_file && g_file_equal (parser_file, file))
return TRUE;
scanner = scanner->parent;
}
return FALSE;
}
static void
gtk_css_provider_init (GtkCssProvider *css_provider)
{
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (css_provider);
priv->rulesets = g_array_new (FALSE, FALSE, sizeof (GtkCssRuleset));
priv->symbolic_colors = g_hash_table_new_full (g_str_hash, g_str_equal,
(GDestroyNotify) g_free,
(GDestroyNotify) _gtk_css_value_unref);
priv->keyframes = g_hash_table_new_full (g_str_hash, g_str_equal,
(GDestroyNotify) g_free,
(GDestroyNotify) _gtk_css_keyframes_unref);
}
static void
verify_tree_match_results (GtkCssProvider *provider,
const GtkCssMatcher *matcher,
GPtrArray *tree_rules)
{
#ifdef VERIFY_TREE
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (css_provider);
GtkCssRuleset *ruleset;
gboolean should_match;
int i, j;
for (i = 0; i < priv->rulesets->len; i++)
{
gboolean found = FALSE;
ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
for (j = 0; j < tree_rules->len; j++)
{
if (ruleset == tree_rules->pdata[j])
{
found = TRUE;
break;
}
}
should_match = _gtk_css_selector_matches (ruleset->selector, matcher);
if (found != !!should_match)
{
g_error ("expected rule '%s' to %s, but it %s",
_gtk_css_selector_to_string (ruleset->selector),
should_match ? "match" : "not match",
found ? "matched" : "didn't match");
}
}
#endif
}
static void
verify_tree_get_change_results (GtkCssProvider *provider,
const GtkCssMatcher *matcher,
GtkCssChange change)
{
#ifdef VERIFY_TREE
{
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (provider);
GtkCssChange verify_change = 0;
GPtrArray *tree_rules;
int i;
tree_rules = _gtk_css_selector_tree_match_all (priv->tree, matcher);
if (tree_rules)
{
verify_tree_match_results (provider, matcher, tree_rules);
for (i = tree_rules->len - 1; i >= 0; i--)
{
GtkCssRuleset *ruleset;
ruleset = tree_rules->pdata[i];
verify_change |= _gtk_css_selector_get_change (ruleset->selector);
}
g_ptr_array_free (tree_rules, TRUE);
}
if (change != verify_change)
{
GString *s;
s = g_string_new ("");
g_string_append (s, "expected change ");
gtk_css_change_print (verify_change, s);
g_string_append (s, ", but it was ");
gtk_css_change_print (change, s);
if ((change & ~verify_change) != 0)
{
g_string_append (s, ", unexpectedly set: ");
gtk_css_change_print (change & ~verify_change, s);
}
if ((~change & verify_change) != 0)
{
g_string_append_printf (s, ", unexpectedly not set: ");
gtk_css_change_print (~change & verify_change, s);
}
g_warning (s->str);
g_string_free (s, TRUE);
}
}
#endif
}
static GtkCssValue *
gtk_css_style_provider_get_color (GtkStyleProvider *provider,
const char *name)
{
GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (css_provider);
return g_hash_table_lookup (priv->symbolic_colors, name);
}
static GtkCssKeyframes *
gtk_css_style_provider_get_keyframes (GtkStyleProvider *provider,
const char *name)
{
GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (css_provider);
return g_hash_table_lookup (priv->keyframes, name);
}
static void
gtk_css_style_provider_lookup (GtkStyleProvider *provider,
const GtkCssMatcher *matcher,
GtkCssLookup *lookup,
GtkCssChange *change)
{
GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (css_provider);
GtkCssRuleset *ruleset;
guint j;
int i;
GPtrArray *tree_rules;
tree_rules = _gtk_css_selector_tree_match_all (priv->tree, matcher);
if (tree_rules)
{
verify_tree_match_results (css_provider, matcher, tree_rules);
for (i = tree_rules->len - 1; i >= 0; i--)
{
ruleset = tree_rules->pdata[i];
if (ruleset->styles == NULL)
continue;
if (!_gtk_bitmask_intersects (_gtk_css_lookup_get_missing (lookup),
ruleset->set_styles))
continue;
for (j = 0; j < ruleset->n_styles; j++)
{
GtkCssStyleProperty *prop = ruleset->styles[j].property;
guint id = _gtk_css_style_property_get_id (prop);
if (!_gtk_css_lookup_is_missing (lookup, id))
continue;
_gtk_css_lookup_set (lookup,
id,
ruleset->styles[j].section,
ruleset->styles[j].value);
}
if (_gtk_bitmask_is_empty (_gtk_css_lookup_get_missing (lookup)))
break;
}
g_ptr_array_free (tree_rules, TRUE);
}
if (change)
{
GtkCssMatcher change_matcher;
_gtk_css_matcher_superset_init (&change_matcher, matcher, GTK_CSS_CHANGE_NAME | GTK_CSS_CHANGE_CLASS);
*change = _gtk_css_selector_tree_get_change_all (priv->tree, &change_matcher);
verify_tree_get_change_results (css_provider, &change_matcher, *change);
}
}
static void
gtk_css_style_provider_iface_init (GtkStyleProviderInterface *iface)
{
iface->get_color = gtk_css_style_provider_get_color;
iface->get_keyframes = gtk_css_style_provider_get_keyframes;
iface->lookup = gtk_css_style_provider_lookup;
iface->emit_error = gtk_css_style_provider_emit_error;
}
static void
gtk_css_provider_finalize (GObject *object)
{
GtkCssProvider *css_provider = GTK_CSS_PROVIDER (object);
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (css_provider);
guint i;
for (i = 0; i < priv->rulesets->len; i++)
gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
g_array_free (priv->rulesets, TRUE);
_gtk_css_selector_tree_free (priv->tree);
g_hash_table_destroy (priv->symbolic_colors);
g_hash_table_destroy (priv->keyframes);
if (priv->resource)
{
g_resources_unregister (priv->resource);
g_resource_unref (priv->resource);
priv->resource = NULL;
}
g_free (priv->path);
G_OBJECT_CLASS (gtk_css_provider_parent_class)->finalize (object);
}
/**
* gtk_css_provider_new:
*
* Returns a newly created #GtkCssProvider.
*
* Returns: A new #GtkCssProvider
**/
GtkCssProvider *
gtk_css_provider_new (void)
{
return g_object_new (GTK_TYPE_CSS_PROVIDER, NULL);
}
static void
css_provider_commit (GtkCssProvider *css_provider,
GSList *selectors,
GtkCssRuleset *ruleset)
{
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (css_provider);
GSList *l;
for (l = selectors; l; l = l->next)
{
GtkCssRuleset new;
gtk_css_ruleset_init_copy (&new, ruleset, l->data);
g_array_append_val (priv->rulesets, new);
}
g_slist_free (selectors);
}
static void
gtk_css_provider_reset (GtkCssProvider *css_provider)
{
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (css_provider);
guint i;
if (priv->resource)
{
g_resources_unregister (priv->resource);
g_resource_unref (priv->resource);
priv->resource = NULL;
}
if (priv->path)
{
g_free (priv->path);
priv->path = NULL;
}
g_hash_table_remove_all (priv->symbolic_colors);
g_hash_table_remove_all (priv->keyframes);
for (i = 0; i < priv->rulesets->len; i++)
gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
g_array_set_size (priv->rulesets, 0);
_gtk_css_selector_tree_free (priv->tree);
priv->tree = NULL;
}
static gboolean
parse_import (GtkCssScanner *scanner)
{
GFile *file;
if (!gtk_css_parser_try_at_keyword (scanner->parser, "import"))
return FALSE;
if (gtk_css_parser_has_token (scanner->parser, GTK_CSS_TOKEN_STRING))
{
char *url;
url = gtk_css_parser_consume_string (scanner->parser);
if (url)
{
file = gtk_css_parser_resolve_url (scanner->parser, url);
if (file == NULL)
{
gtk_css_parser_error_import (scanner->parser,
"Could not resolve \"%s\" to a valid URL",
url);
}
g_free (url);
}
else
file = NULL;
}
else
{
char *url = gtk_css_parser_consume_url (scanner->parser);
if (url)
{
file = gtk_css_parser_resolve_url (scanner->parser, url);
g_free (url);
}
else
file = NULL;
}
if (file == NULL)
{
/* nothing to do */
}
else if (!gtk_css_parser_has_token (scanner->parser, GTK_CSS_TOKEN_EOF))
{
gtk_css_parser_error_syntax (scanner->parser, "Expected ';'");
}
else if (gtk_css_scanner_would_recurse (scanner, file))
{
char *path = g_file_get_path (file);
gtk_css_parser_error (scanner->parser,
GTK_CSS_PARSER_ERROR_IMPORT,
gtk_css_parser_get_block_location (scanner->parser),
gtk_css_parser_get_end_location (scanner->parser),
"Loading '%s' would recurse",
path);
g_free (path);
}
else
{
gtk_css_provider_load_internal (scanner->provider,
scanner,
file,
NULL);
}
g_clear_object (&file);
return TRUE;
}
static gboolean
parse_color_definition (GtkCssScanner *scanner)
{
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (scanner->provider);
GtkCssValue *color;
char *name;
if (!gtk_css_parser_try_at_keyword (scanner->parser, "define-color"))
return FALSE;
name = gtk_css_parser_consume_ident (scanner->parser);
if (name == NULL)
return TRUE;
color = _gtk_css_color_value_parse (scanner->parser);
if (color == NULL)
{
g_free (name);
return TRUE;
}
if (!gtk_css_parser_has_token (scanner->parser, GTK_CSS_TOKEN_EOF))
{
g_free (name);
_gtk_css_value_unref (color);
gtk_css_parser_error_syntax (scanner->parser,
"Missing semicolon at end of color definition");
return TRUE;
}
g_hash_table_insert (priv->symbolic_colors, name, color);
return TRUE;
}
static gboolean
parse_keyframes (GtkCssScanner *scanner)
{
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (scanner->provider);
GtkCssKeyframes *keyframes;
char *name;
if (!gtk_css_parser_try_at_keyword (scanner->parser, "keyframes"))
return FALSE;
name = gtk_css_parser_consume_ident (scanner->parser);
if (name == NULL)
return FALSE;
if (!gtk_css_parser_has_token (scanner->parser, GTK_CSS_TOKEN_EOF))
{
gtk_css_parser_error_syntax (scanner->parser, "Expected '{' for keyframes");
return FALSE;
}
gtk_css_parser_end_block_prelude (scanner->parser);
keyframes = _gtk_css_keyframes_parse (scanner->parser);
if (keyframes != NULL)
g_hash_table_insert (priv->keyframes, name, keyframes);
if (!gtk_css_parser_has_token (scanner->parser, GTK_CSS_TOKEN_EOF))
gtk_css_parser_error_syntax (scanner->parser, "Expected '}' after declarations");
return TRUE;
}
static void
parse_at_keyword (GtkCssScanner *scanner)
{
gtk_css_parser_start_semicolon_block (scanner->parser, GTK_CSS_TOKEN_OPEN_CURLY);
if (!parse_import (scanner) &&
!parse_color_definition (scanner) &&
!parse_keyframes (scanner))
{
gtk_css_parser_error_syntax (scanner->parser, "Unknown @ rule");
}
gtk_css_parser_end_block (scanner->parser);
}
static GSList *
parse_selector_list (GtkCssScanner *scanner)
{
GSList *selectors = NULL;
do {
GtkCssSelector *select = _gtk_css_selector_parse (scanner->parser);
if (select == NULL)
return NULL;
selectors = g_slist_prepend (selectors, select);
}
while (gtk_css_parser_try_token (scanner->parser, GTK_CSS_TOKEN_COMMA));
return selectors;
}
static void
parse_declaration (GtkCssScanner *scanner,
GtkCssRuleset *ruleset)
{
GtkStyleProperty *property;
char *name;
/* advance the location over whitespace */
gtk_css_parser_get_token (scanner->parser);
gtk_css_parser_start_semicolon_block (scanner->parser, GTK_CSS_TOKEN_EOF);
if (gtk_css_parser_has_token (scanner->parser, GTK_CSS_TOKEN_EOF))
{
gtk_css_parser_warn_syntax (scanner->parser, "Empty declaration");
gtk_css_parser_end_block (scanner->parser);
return;
}
name = gtk_css_parser_consume_ident (scanner->parser);
if (name == NULL)
{
gtk_css_parser_end_block (scanner->parser);
return;
}
property = _gtk_style_property_lookup (name);
if (property)
{
GtkCssSection *section;
GtkCssValue *value;
if (!gtk_css_parser_try_token (scanner->parser, GTK_CSS_TOKEN_COLON))
{
gtk_css_parser_error_syntax (scanner->parser, "Expected ':'");
g_free (name);
gtk_css_parser_end_block (scanner->parser);
return;
}
value = _gtk_style_property_parse_value (property,
scanner->parser);
if (value == NULL)
{
gtk_css_parser_end_block (scanner->parser);
return;
}
if (!gtk_css_parser_has_token (scanner->parser, GTK_CSS_TOKEN_EOF))
{
gtk_css_parser_error_syntax (scanner->parser, "Junk at end of value for %s", property->name);
gtk_css_parser_end_block (scanner->parser);
return;
}
if (gtk_keep_css_sections)
{
section = gtk_css_section_new (gtk_css_parser_get_file (scanner->parser),
gtk_css_parser_get_block_location (scanner->parser),
gtk_css_parser_get_end_location (scanner->parser));
}
else
section = NULL;
if (GTK_IS_CSS_SHORTHAND_PROPERTY (property))
{
GtkCssShorthandProperty *shorthand = GTK_CSS_SHORTHAND_PROPERTY (property);
guint i;
for (i = 0; i < _gtk_css_shorthand_property_get_n_subproperties (shorthand); i++)
{
GtkCssStyleProperty *child = _gtk_css_shorthand_property_get_subproperty (shorthand, i);
GtkCssValue *sub = _gtk_css_array_value_get_nth (value, i);
gtk_css_ruleset_add (ruleset, child, _gtk_css_value_ref (sub), section);
}
_gtk_css_value_unref (value);
}
else if (GTK_IS_CSS_STYLE_PROPERTY (property))
{
gtk_css_ruleset_add (ruleset, GTK_CSS_STYLE_PROPERTY (property), value, section);
}
else
{
g_assert_not_reached ();
_gtk_css_value_unref (value);
}
g_clear_pointer (&section, gtk_css_section_unref);
}
else
{
gtk_css_parser_error_value (scanner->parser, "No property named \"%s\"", name);
}
g_free (name);
gtk_css_parser_end_block (scanner->parser);
}
static void
parse_declarations (GtkCssScanner *scanner,
GtkCssRuleset *ruleset)
{
while (!gtk_css_parser_has_token (scanner->parser, GTK_CSS_TOKEN_EOF))
{
parse_declaration (scanner, ruleset);
}
}
static void
parse_ruleset (GtkCssScanner *scanner)
{
GSList *selectors;
GtkCssRuleset ruleset = { 0, };
selectors = parse_selector_list (scanner);
if (selectors == NULL)
{
gtk_css_parser_skip_until (scanner->parser, GTK_CSS_TOKEN_OPEN_CURLY);
gtk_css_parser_skip (scanner->parser);
return;
}
if (!gtk_css_parser_has_token (scanner->parser, GTK_CSS_TOKEN_OPEN_CURLY))
{
gtk_css_parser_error_syntax (scanner->parser, "Expected '{' after selectors");
g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
gtk_css_parser_skip_until (scanner->parser, GTK_CSS_TOKEN_OPEN_CURLY);
gtk_css_parser_skip (scanner->parser);
return;
}
gtk_css_parser_start_block (scanner->parser);
parse_declarations (scanner, &ruleset);
gtk_css_parser_end_block (scanner->parser);
css_provider_commit (scanner->provider, selectors, &ruleset);
gtk_css_ruleset_clear (&ruleset);
}
static void
parse_statement (GtkCssScanner *scanner)
{
if (gtk_css_parser_has_token (scanner->parser, GTK_CSS_TOKEN_AT_KEYWORD))
parse_at_keyword (scanner);
else
parse_ruleset (scanner);
}
static void
parse_stylesheet (GtkCssScanner *scanner)
{
while (!gtk_css_parser_has_token (scanner->parser, GTK_CSS_TOKEN_EOF))
{
if (gtk_css_parser_has_token (scanner->parser, GTK_CSS_TOKEN_CDO) ||
gtk_css_parser_has_token (scanner->parser, GTK_CSS_TOKEN_CDC))
{
gtk_css_parser_consume_token (scanner->parser);
continue;
}
parse_statement (scanner);
}
}
static int
gtk_css_provider_compare_rule (gconstpointer a_,
gconstpointer b_)
{
const GtkCssRuleset *a = (const GtkCssRuleset *) a_;
const GtkCssRuleset *b = (const GtkCssRuleset *) b_;
int compare;
compare = _gtk_css_selector_compare (a->selector, b->selector);
if (compare != 0)
return compare;
return 0;
}
static void
gtk_css_provider_postprocess (GtkCssProvider *css_provider)
{
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (css_provider);
GtkCssSelectorTreeBuilder *builder;
guint i;
g_array_sort (priv->rulesets, gtk_css_provider_compare_rule);
builder = _gtk_css_selector_tree_builder_new ();
for (i = 0; i < priv->rulesets->len; i++)
{
GtkCssRuleset *ruleset;
ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
_gtk_css_selector_tree_builder_add (builder,
ruleset->selector,
&ruleset->selector_match,
ruleset);
}
priv->tree = _gtk_css_selector_tree_builder_build (builder);
_gtk_css_selector_tree_builder_free (builder);
#ifndef VERIFY_TREE
for (i = 0; i < priv->rulesets->len; i++)
{
GtkCssRuleset *ruleset;
ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
_gtk_css_selector_free (ruleset->selector);
ruleset->selector = NULL;
}
#endif
}
static void
gtk_css_provider_load_internal (GtkCssProvider *self,
GtkCssScanner *parent,
GFile *file,
GBytes *bytes)
{
if (bytes == NULL)
{
GError *load_error = NULL;
bytes = g_file_load_bytes (file, NULL, NULL, &load_error);
if (bytes == NULL)
{
if (parent == NULL)
{
GtkCssLocation empty = { 0, };
GtkCssSection *section = gtk_css_section_new (file, &empty, &empty);
gtk_css_style_provider_emit_error (GTK_STYLE_PROVIDER (self), section, load_error);
gtk_css_section_unref (section);
}
else
{
gtk_css_parser_error (parent->parser,
GTK_CSS_PARSER_ERROR_IMPORT,
gtk_css_parser_get_block_location (parent->parser),
gtk_css_parser_get_end_location (parent->parser),
"Failed to import: %s",
load_error->message);
}
}
}
if (bytes)
{
GtkCssScanner *scanner;
scanner = gtk_css_scanner_new (self,
parent,
file,
bytes);
parse_stylesheet (scanner);
gtk_css_scanner_destroy (scanner);
if (parent == NULL)
gtk_css_provider_postprocess (self);
}
}
/**
* gtk_css_provider_load_from_data:
* @css_provider: a #GtkCssProvider
* @data: (array length=length) (element-type guint8): CSS data loaded in memory
* @length: the length of @data in bytes, or -1 for NUL terminated strings. If
* @length is not -1, the code will assume it is not NUL terminated and will
* potentially do a copy.
*
* Loads @data into @css_provider, and by doing so clears any previously loaded
* information.
**/
void
gtk_css_provider_load_from_data (GtkCssProvider *css_provider,
const gchar *data,
gssize length)
{
GBytes *bytes;
g_return_if_fail (GTK_IS_CSS_PROVIDER (css_provider));
g_return_if_fail (data != NULL);
if (length < 0)
length = strlen (data);
bytes = g_bytes_new_static (data, length);
gtk_css_provider_reset (css_provider);
gtk_css_provider_load_internal (css_provider, NULL, NULL, bytes);
g_bytes_unref (bytes);
gtk_style_provider_changed (GTK_STYLE_PROVIDER (css_provider));
}
/**
* gtk_css_provider_load_from_file:
* @css_provider: a #GtkCssProvider
* @file: #GFile pointing to a file to load
*
* Loads the data contained in @file into @css_provider, making it
* clear any previously loaded information.
**/
void
gtk_css_provider_load_from_file (GtkCssProvider *css_provider,
GFile *file)
{
g_return_if_fail (GTK_IS_CSS_PROVIDER (css_provider));
g_return_if_fail (G_IS_FILE (file));
gtk_css_provider_reset (css_provider);
gtk_css_provider_load_internal (css_provider, NULL, file, NULL);
gtk_style_provider_changed (GTK_STYLE_PROVIDER (css_provider));
}
/**
* gtk_css_provider_load_from_path:
* @css_provider: a #GtkCssProvider
* @path: the path of a filename to load, in the GLib filename encoding
*
* Loads the data contained in @path into @css_provider, making it clear
* any previously loaded information.
**/
void
gtk_css_provider_load_from_path (GtkCssProvider *css_provider,
const gchar *path)
{
GFile *file;
g_return_if_fail (GTK_IS_CSS_PROVIDER (css_provider));
g_return_if_fail (path != NULL);
file = g_file_new_for_path (path);
gtk_css_provider_load_from_file (css_provider, file);
g_object_unref (file);
}
/**
* gtk_css_provider_load_from_resource:
* @css_provider: a #GtkCssProvider
* @resource_path: a #GResource resource path
*
* Loads the data contained in the resource at @resource_path into
* the #GtkCssProvider, clearing any previously loaded information.
*
* To track errors while loading CSS, connect to the
* #GtkCssProvider::parsing-error signal.
*/
void
gtk_css_provider_load_from_resource (GtkCssProvider *css_provider,
const gchar *resource_path)
{
GFile *file;
gchar *uri, *escaped;
g_return_if_fail (GTK_IS_CSS_PROVIDER (css_provider));
g_return_if_fail (resource_path != NULL);
escaped = g_uri_escape_string (resource_path,
G_URI_RESERVED_CHARS_ALLOWED_IN_PATH, FALSE);
uri = g_strconcat ("resource://", escaped, NULL);
g_free (escaped);
file = g_file_new_for_uri (uri);
g_free (uri);
gtk_css_provider_load_from_file (css_provider, file);
g_object_unref (file);
}
gchar *
_gtk_get_theme_dir (void)
{
const gchar *var;
var = g_getenv ("GTK_DATA_PREFIX");
if (var == NULL)
var = _gtk_get_data_prefix ();
return g_build_filename (var, "share", "themes", NULL);
}
/* Return the path that this providers gtk.css was loaded from,
* if it is part of a theme, otherwise NULL.
*/
const gchar *
_gtk_css_provider_get_theme_dir (GtkCssProvider *provider)
{
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (provider);
return priv->path;
}
#if (GTK_MINOR_VERSION % 2)
#define MINOR (GTK_MINOR_VERSION + 1)
#else
#define MINOR GTK_MINOR_VERSION
#endif
/*
* Look for
* $dir/$subdir/gtk-4.16/gtk-$variant.css
* $dir/$subdir/gtk-4.14/gtk-$variant.css
* ...
* $dir/$subdir/gtk-4.0/gtk-$variant.css
* and return the first found file.
*/
static gchar *
_gtk_css_find_theme_dir (const gchar *dir,
const gchar *subdir,
const gchar *name,
const gchar *variant)
{
gchar *file;
gchar *base;
gchar *subsubdir;
gint i;
gchar *path;
if (variant)
file = g_strconcat ("gtk-", variant, ".css", NULL);
else
file = g_strdup ("gtk.css");
if (subdir)
base = g_build_filename (dir, subdir, name, NULL);
else
base = g_build_filename (dir, name, NULL);
for (i = MINOR; i >= 0; i = i - 2)
{
subsubdir = g_strdup_printf ("gtk-4.%d", i);
path = g_build_filename (base, subsubdir, file, NULL);
g_free (subsubdir);
if (g_file_test (path, G_FILE_TEST_EXISTS))
break;
g_free (path);
path = NULL;
}
g_free (file);
g_free (base);
return path;
}
#undef MINOR
static gchar *
_gtk_css_find_theme (const gchar *name,
const gchar *variant)
{
gchar *path;
const char *const *dirs;
int i;
char *dir;
/* First look in the user's data directory */
path = _gtk_css_find_theme_dir (g_get_user_data_dir (), "themes", name, variant);
if (path)
return path;
/* Next look in the user's home directory */
path = _gtk_css_find_theme_dir (g_get_home_dir (), ".themes", name, variant);
if (path)
return path;
/* Look in system data directories */
dirs = g_get_system_data_dirs ();
for (i = 0; dirs[i]; i++)
{
path = _gtk_css_find_theme_dir (dirs[i], "themes", name, variant);
if (path)
return path;
}
/* Finally, try in the default theme directory */
dir = _gtk_get_theme_dir ();
path = _gtk_css_find_theme_dir (dir, NULL, name, variant);
g_free (dir);
return path;
}
/**
* gtk_css_provider_load_named:
* @provider: a #GtkCssProvider
* @name: A theme name
* @variant: (allow-none): variant to load, for example, "dark", or
* %NULL for the default
*
* Loads a theme from the usual theme paths. The actual process of
* finding the theme might change between releases, but it is
* guaranteed that this function uses the same mechanism to load the
* theme that GTK uses for loading its own theme.
**/
void
gtk_css_provider_load_named (GtkCssProvider *provider,
const gchar *name,
const gchar *variant)
{
gchar *path;
gchar *resource_path;
g_return_if_fail (GTK_IS_CSS_PROVIDER (provider));
g_return_if_fail (name != NULL);
gtk_css_provider_reset (provider);
/* try loading the resource for the theme. This is mostly meant for built-in
* themes.
*/
if (variant)
resource_path = g_strdup_printf ("/org/gtk/libgtk/theme/%s/gtk-%s.css", name, variant);
else
resource_path = g_strdup_printf ("/org/gtk/libgtk/theme/%s/gtk.css", name);
if (g_resources_get_info (resource_path, 0, NULL, NULL, NULL))
{
gtk_css_provider_load_from_resource (provider, resource_path);
g_free (resource_path);
return;
}
g_free (resource_path);
/* Next try looking for files in the various theme directories. */
path = _gtk_css_find_theme (name, variant);
if (path)
{
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (provider);
char *dir, *resource_file;
GResource *resource;
dir = g_path_get_dirname (path);
resource_file = g_build_filename (dir, "gtk.gresource", NULL);
resource = g_resource_load (resource_file, NULL);
g_free (resource_file);
if (resource != NULL)
g_resources_register (resource);
gtk_css_provider_load_from_path (provider, path);
/* Only set this after load, as load_from_path will clear it */
priv->resource = resource;
priv->path = dir;
g_free (path);
}
else
{
/* Things failed! Fall back! Fall back! */
if (variant)
{
/* If there was a variant, try without */
gtk_css_provider_load_named (provider, name, NULL);
}
else
{
/* Worst case, fall back to the default */
g_return_if_fail (!g_str_equal (name, DEFAULT_THEME_NAME)); /* infloop protection */
gtk_css_provider_load_named (provider, DEFAULT_THEME_NAME, NULL);
}
}
}
static int
compare_properties (gconstpointer a, gconstpointer b, gpointer style)
{
const guint *ua = a;
const guint *ub = b;
PropertyValue *styles = style;
return strcmp (_gtk_style_property_get_name (GTK_STYLE_PROPERTY (styles[*ua].property)),
_gtk_style_property_get_name (GTK_STYLE_PROPERTY (styles[*ub].property)));
}
static void
gtk_css_ruleset_print (const GtkCssRuleset *ruleset,
GString *str)
{
guint i;
_gtk_css_selector_tree_match_print (ruleset->selector_match, str);
g_string_append (str, " {\n");
if (ruleset->styles)
{
guint *sorted = g_new (guint, ruleset->n_styles);
for (i = 0; i < ruleset->n_styles; i++)
sorted[i] = i;
/* so the output is identical for identical selector styles */
g_qsort_with_data (sorted, ruleset->n_styles, sizeof (guint), compare_properties, ruleset->styles);
for (i = 0; i < ruleset->n_styles; i++)
{
PropertyValue *prop = &ruleset->styles[sorted[i]];
g_string_append (str, " ");
g_string_append (str, _gtk_style_property_get_name (GTK_STYLE_PROPERTY (prop->property)));
g_string_append (str, ": ");
_gtk_css_value_print (prop->value, str);
g_string_append (str, ";\n");
}
g_free (sorted);
}
g_string_append (str, "}\n");
}
static void
gtk_css_provider_print_colors (GHashTable *colors,
GString *str)
{
GList *keys, *walk;
keys = g_hash_table_get_keys (colors);
/* so the output is identical for identical styles */
keys = g_list_sort (keys, (GCompareFunc) strcmp);
for (walk = keys; walk; walk = walk->next)
{
const char *name = walk->data;
GtkCssValue *color = g_hash_table_lookup (colors, (gpointer) name);
g_string_append (str, "@define-color ");
g_string_append (str, name);
g_string_append (str, " ");
_gtk_css_value_print (color, str);
g_string_append (str, ";\n");
}
g_list_free (keys);
}
static void
gtk_css_provider_print_keyframes (GHashTable *keyframes,
GString *str)
{
GList *keys, *walk;
keys = g_hash_table_get_keys (keyframes);
/* so the output is identical for identical styles */
keys = g_list_sort (keys, (GCompareFunc) strcmp);
for (walk = keys; walk; walk = walk->next)
{
const char *name = walk->data;
GtkCssKeyframes *keyframe = g_hash_table_lookup (keyframes, (gpointer) name);
if (str->len > 0)
g_string_append (str, "\n");
g_string_append (str, "@keyframes ");
g_string_append (str, name);
g_string_append (str, " {\n");
_gtk_css_keyframes_print (keyframe, str);
g_string_append (str, "}\n");
}
g_list_free (keys);
}
/**
* gtk_css_provider_to_string:
* @provider: the provider to write to a string
*
* Converts the @provider into a string representation in CSS
* format.
*
* Using gtk_css_provider_load_from_data() with the return value
* from this function on a new provider created with
* gtk_css_provider_new() will basically create a duplicate of
* this @provider.
*
* Returns: a new string representing the @provider.
**/
char *
gtk_css_provider_to_string (GtkCssProvider *provider)
{
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (provider);
GString *str;
guint i;
g_return_val_if_fail (GTK_IS_CSS_PROVIDER (provider), NULL);
str = g_string_new ("");
gtk_css_provider_print_colors (priv->symbolic_colors, str);
gtk_css_provider_print_keyframes (priv->keyframes, str);
for (i = 0; i < priv->rulesets->len; i++)
{
if (str->len != 0)
g_string_append (str, "\n");
gtk_css_ruleset_print (&g_array_index (priv->rulesets, GtkCssRuleset, i), str);
}
return g_string_free (str, FALSE);
}
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