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gtk2/gtk/gtkcssprovider.c
Matthias Clasen f0c1c3349f css: Simplify the superset matcher 
We use the superset matcher in exactly one place,
so there is no need for the generality of allowing
to ignore different aspects. Just hardcode the one
case we need: ignoring everything except for name,
id and class.
2020-01-16 19:11:08 -05:00

1528 lines
43 KiB
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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;
guint n_styles;
guint owns_styles : 1;
};
struct _GtkCssScanner
{
GtkCssProvider *provider;
GtkCssParser *parser;
GtkCssScanner *parent;
};
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;
}
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->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);
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 (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
}
/* Compute the change flags for a given matcher.
* We assume that name, id and classes stay unchanged, and look for all rules
* that can be matched if anything else changes. We collect the change masks
* from the selectors of these rules.
*/
static GtkCssChange
compute_change (GtkCssProvider *provider,
const GtkCssMatcher *matcher)
{
GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (provider);
GtkCssChange change = 0;
GPtrArray *tree_rules;
int i;
GtkCssMatcher change_matcher;
_gtk_css_matcher_superset_init (&change_matcher, matcher);
tree_rules = _gtk_css_selector_tree_match_all (priv->tree, &change_matcher);
if (tree_rules)
{
for (i = tree_rules->len - 1; i >= 0; i--)
{
GtkCssRuleset *ruleset;
ruleset = tree_rules->pdata[i];
change |= _gtk_css_selector_get_change (ruleset->selector);
}
g_ptr_array_free (tree_rules, TRUE);
}
return change;
}
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;
if (_gtk_css_selector_tree_is_empty (priv->tree))
return;
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;
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_css_lookup_all_set (lookup))
break;
}
g_ptr_array_free (tree_rules, TRUE);
}
if (change)
*change = compute_change (css_provider, matcher);
}
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;
if (ruleset->styles == NULL)
{
g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
return;
}
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);
}
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);
g_bytes_unref (bytes);
}
}
/**
* 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);
g_bytes_ref (bytes);
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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