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089eafb468
gtk2/gtk/gtkcssselector.c
Alexander Larsson 089eafb468 css: Clean up tree_match implementations 
A bunch of repeated code is broken out into the helper
gtk_css_selector_tree_match_previous().
2012-12-10 12:28:44 +01:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 2011 Benjamin Otte <otte@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 "gtkcssselectorprivate.h"
#include <stdlib.h>
#include <string.h>
#include "gtkcssprovider.h"
#include "gtkstylecontextprivate.h"
/* When checking for changes via the tree we need to know if a rule further
down the tree matched, because if so we need to add "our bit" to the
Change. For instance in a a match like *.class:active we'll
get a tree that first checks :active, if that matches we continue down
to the tree, and if we get a match we add CHANGE_CLASS. However, the
end of the tree where we have a match is an ANY which doesn't actually
modify the change, so we don't know if we have a match or not. We fix
this by setting GTK_CSS_CHANGE_GOT_MATCH which lets us guarantee
that change != 0 on any match. */
#define GTK_CSS_CHANGE_GOT_MATCH GTK_CSS_CHANGE_RESERVED_BIT
typedef struct _GtkCssSelectorClass GtkCssSelectorClass;
struct _GtkCssSelectorClass {
const char *name;
void (* print) (const GtkCssSelector *selector,
GString *string);
gboolean (* match) (const GtkCssSelector *selector,
const GtkCssMatcher *matcher);
void (* tree_match) (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher,
GHashTable *res);
GtkCssChange (* get_change) (const GtkCssSelector *selector,
GtkCssChange previous_change);
GtkCssChange (* tree_get_change) (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher);
int (* compare_one) (const GtkCssSelector *a,
const GtkCssSelector *b);
guint increase_id_specificity :1;
guint increase_class_specificity :1;
guint increase_element_specificity :1;
guint is_simple :1;
guint must_keep_order :1; /* Due to region weirdness these must be kept before a DESCENDANT, so don't reorder */
};
struct _GtkCssSelector
{
const GtkCssSelectorClass *class; /* type of check this selector does */
gconstpointer data; /* data for matching:
- interned string for CLASS, NAME and ID
- GUINT_TO_POINTER() for PSEUDOCLASS_REGION/STATE */
};
#define GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET G_MAXINT32
struct _GtkCssSelectorTree
{
GtkCssSelector selector;
gint32 parent_offset;
gint32 previous_offset;
gint32 sibling_offset;
gint32 matches_offset; /* pointers that we return as matches if selector matches */
};
static gboolean
gtk_css_selector_equal (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return
a->class == b->class &&
a->data == b->data;
}
static guint
gtk_css_selector_hash (const GtkCssSelector *selector)
{
return GPOINTER_TO_UINT (selector->class) ^ GPOINTER_TO_UINT (selector->data);
}
static gpointer *
gtk_css_selector_tree_get_matches (const GtkCssSelectorTree *tree)
{
if (tree->matches_offset == GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
return NULL;
return (gpointer *) ((guint8 *)tree + tree->matches_offset);
}
static void
gtk_css_selector_tree_found_match (const GtkCssSelectorTree *tree,
GHashTable *res)
{
int i;
gpointer *matches;
matches = gtk_css_selector_tree_get_matches (tree);
if (matches)
{
for (i = 0; matches[i] != NULL; i++)
g_hash_table_insert (res, matches[i], matches[i]);
}
}
static void
gtk_css_selector_tree_match (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher,
GHashTable *res)
{
if (tree == NULL)
return;
tree->selector.class->tree_match (tree, matcher, res);
}
static GtkCssChange
gtk_css_selector_tree_get_change (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
if (tree == NULL)
return 0;
return tree->selector.class->tree_get_change (tree, matcher);
}
static gboolean
gtk_css_selector_match (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
if (selector == NULL)
return TRUE;
return selector->class->match (selector, matcher);
}
static int
gtk_css_selector_compare_one (const GtkCssSelector *a, const GtkCssSelector *b)
{
if (a->class != b->class)
return strcmp (a->class->name, b->class->name);
else
return a->class->compare_one (a, b);
}
static const GtkCssSelector *
gtk_css_selector_previous (const GtkCssSelector *selector)
{
selector = selector + 1;
return selector->class ? selector : NULL;
}
static const GtkCssSelectorTree *
gtk_css_selector_tree_at_offset (const GtkCssSelectorTree *tree,
gint32 offset)
{
if (offset == GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
return NULL;
return (GtkCssSelectorTree *) ((guint8 *)tree + offset);
}
static const GtkCssSelectorTree *
gtk_css_selector_tree_get_parent (const GtkCssSelectorTree *tree)
{
return gtk_css_selector_tree_at_offset (tree, tree->parent_offset);
}
static const GtkCssSelectorTree *
gtk_css_selector_tree_get_previous (const GtkCssSelectorTree *tree)
{
return gtk_css_selector_tree_at_offset (tree, tree->previous_offset);
}
static const GtkCssSelectorTree *
gtk_css_selector_tree_get_sibling (const GtkCssSelectorTree *tree)
{
return gtk_css_selector_tree_at_offset (tree, tree->sibling_offset);
}
static void
gtk_css_selector_tree_match_previous (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher,
GHashTable *res)
{
const GtkCssSelectorTree *prev;
for (prev = gtk_css_selector_tree_get_previous (tree);
prev != NULL;
prev = gtk_css_selector_tree_get_sibling (prev))
gtk_css_selector_tree_match (prev, matcher, res);
}
static GtkCssChange
gtk_css_selector_tree_get_previous_change (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
GtkCssChange previous_change = 0;
const GtkCssSelectorTree *prev;
for (prev = gtk_css_selector_tree_get_previous (tree);
prev != NULL;
prev = gtk_css_selector_tree_get_sibling (prev))
previous_change |= gtk_css_selector_tree_get_change (prev, matcher);
return previous_change;
}
/* DESCENDANT */
static void
gtk_css_selector_descendant_print (const GtkCssSelector *selector,
GString *string)
{
g_string_append_c (string, ' ');
}
static gboolean
gtk_css_selector_descendant_match (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
GtkCssMatcher ancestor;
while (_gtk_css_matcher_get_parent (&ancestor, matcher))
{
matcher = &ancestor;
if (gtk_css_selector_match (gtk_css_selector_previous (selector), matcher))
return TRUE;
}
return FALSE;
}
static void
gtk_css_selector_descendant_tree_match (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher,
GHashTable *res)
{
GtkCssMatcher ancestor;
while (_gtk_css_matcher_get_parent (&ancestor, matcher))
{
matcher = &ancestor;
gtk_css_selector_tree_match_previous (tree, matcher, res);
/* any matchers are dangerous here, as we may loop forever, but
we can terminate now as all possible matches have already been added */
if (_gtk_css_matcher_matches_any (matcher))
break;
}
}
static GtkCssChange
gtk_css_selector_descendant_tree_get_change (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
GtkCssMatcher ancestor;
GtkCssChange change, previous_change;
change = 0;
previous_change = 0;
while (_gtk_css_matcher_get_parent (&ancestor, matcher))
{
matcher = &ancestor;
previous_change |= gtk_css_selector_tree_get_previous_change (tree, matcher);
/* any matchers are dangerous here, as we may loop forever, but
we can terminate now as all possible matches have already been added */
if (_gtk_css_matcher_matches_any (matcher))
break;
}
if (previous_change != 0)
change |= _gtk_css_change_for_child (previous_change) | GTK_CSS_CHANGE_GOT_MATCH;
return change;
}
static int
gtk_css_selector_descendant_compare_one (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return 0;
}
static GtkCssChange
gtk_css_selector_descendant_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
{
return _gtk_css_change_for_child (previous_change);
}
static const GtkCssSelectorClass GTK_CSS_SELECTOR_DESCENDANT = {
"descendant",
gtk_css_selector_descendant_print,
gtk_css_selector_descendant_match,
gtk_css_selector_descendant_tree_match,
gtk_css_selector_descendant_get_change,
gtk_css_selector_descendant_tree_get_change,
gtk_css_selector_descendant_compare_one,
FALSE, FALSE, FALSE, FALSE, FALSE
};
/* CHILD */
static void
gtk_css_selector_child_print (const GtkCssSelector *selector,
GString *string)
{
g_string_append (string, " > ");
}
static gboolean
gtk_css_selector_child_match (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
GtkCssMatcher parent;
if (!_gtk_css_matcher_get_parent (&parent, matcher))
return FALSE;
return gtk_css_selector_match (gtk_css_selector_previous (selector), &parent);
}
static void
gtk_css_selector_child_tree_match (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher,
GHashTable *res)
{
GtkCssMatcher parent;
if (!_gtk_css_matcher_get_parent (&parent, matcher))
return;
gtk_css_selector_tree_match_previous (tree, &parent, res);
}
static GtkCssChange
gtk_css_selector_child_tree_get_change (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
GtkCssMatcher parent;
GtkCssChange change, previous_change;
if (!_gtk_css_matcher_get_parent (&parent, matcher))
return 0;
change = 0;
previous_change = gtk_css_selector_tree_get_previous_change (tree, &parent);
if (previous_change != 0)
change |= _gtk_css_change_for_child (previous_change) | GTK_CSS_CHANGE_GOT_MATCH;
return change;
}
static GtkCssChange
gtk_css_selector_child_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
{
return _gtk_css_change_for_child (previous_change);
}
static int
gtk_css_selector_child_compare_one (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return 0;
}
static const GtkCssSelectorClass GTK_CSS_SELECTOR_CHILD = {
"child",
gtk_css_selector_child_print,
gtk_css_selector_child_match,
gtk_css_selector_child_tree_match,
gtk_css_selector_child_get_change,
gtk_css_selector_child_tree_get_change,
gtk_css_selector_child_compare_one,
FALSE, FALSE, FALSE, FALSE, FALSE
};
/* SIBLING */
static void
gtk_css_selector_sibling_print (const GtkCssSelector *selector,
GString *string)
{
g_string_append (string, " ~ ");
}
static gboolean
gtk_css_selector_sibling_match (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
GtkCssMatcher previous;
while (_gtk_css_matcher_get_previous (&previous, matcher))
{
matcher = &previous;
if (gtk_css_selector_match (gtk_css_selector_previous (selector), matcher))
return TRUE;
}
return FALSE;
}
static void
gtk_css_selector_sibling_tree_match (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher,
GHashTable *res)
{
GtkCssMatcher previous;
while (_gtk_css_matcher_get_previous (&previous, matcher))
{
matcher = &previous;
gtk_css_selector_tree_match_previous (tree, matcher, res);
/* any matchers are dangerous here, as we may loop forever, but
we can terminate now as all possible matches have already been added */
if (_gtk_css_matcher_matches_any (matcher))
break;
}
}
static GtkCssChange
gtk_css_selector_sibling_tree_get_change (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
GtkCssMatcher previous;
GtkCssChange change, previous_change;
change = 0;
previous_change = 0;
while (_gtk_css_matcher_get_previous (&previous, matcher))
{
matcher = &previous;
previous_change |= gtk_css_selector_tree_get_previous_change (tree, matcher);
/* any matchers are dangerous here, as we may loop forever, but
we can terminate now as all possible matches have already been added */
if (_gtk_css_matcher_matches_any (matcher))
break;
}
if (previous_change != 0)
change |= _gtk_css_change_for_sibling (previous_change) | GTK_CSS_CHANGE_GOT_MATCH;
return change;
}
static GtkCssChange
gtk_css_selector_sibling_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
{
return _gtk_css_change_for_sibling (previous_change);
}
static int
gtk_css_selector_sibling_compare_one (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return 0;
}
static const GtkCssSelectorClass GTK_CSS_SELECTOR_SIBLING = {
"sibling",
gtk_css_selector_sibling_print,
gtk_css_selector_sibling_match,
gtk_css_selector_sibling_tree_match,
gtk_css_selector_sibling_get_change,
gtk_css_selector_sibling_tree_get_change,
gtk_css_selector_sibling_compare_one,
FALSE, FALSE, FALSE, FALSE, FALSE
};
/* ADJACENT */
static void
gtk_css_selector_adjacent_print (const GtkCssSelector *selector,
GString *string)
{
g_string_append (string, " + ");
}
static gboolean
gtk_css_selector_adjacent_match (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
GtkCssMatcher previous;
if (!_gtk_css_matcher_get_previous (&previous, matcher))
return FALSE;
return gtk_css_selector_match (gtk_css_selector_previous (selector), &previous);
}
static void
gtk_css_selector_adjacent_tree_match (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher,
GHashTable *res)
{
GtkCssMatcher previous;
if (!_gtk_css_matcher_get_previous (&previous, matcher))
return;
matcher = &previous;
gtk_css_selector_tree_match_previous (tree, matcher, res);
}
static GtkCssChange
gtk_css_selector_adjacent_tree_get_change (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
GtkCssMatcher previous;
GtkCssChange change, previous_change;
if (!_gtk_css_matcher_get_previous (&previous, matcher))
return 0;
change = 0;
previous_change = gtk_css_selector_tree_get_previous_change (tree, &previous);
if (previous_change != 0)
change |= _gtk_css_change_for_sibling (previous_change) | GTK_CSS_CHANGE_GOT_MATCH;
return change;
}
static GtkCssChange
gtk_css_selector_adjacent_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
{
return _gtk_css_change_for_sibling (previous_change);
}
static int
gtk_css_selector_adjacent_compare_one (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return 0;
}
static const GtkCssSelectorClass GTK_CSS_SELECTOR_ADJACENT = {
"adjacent",
gtk_css_selector_adjacent_print,
gtk_css_selector_adjacent_match,
gtk_css_selector_adjacent_tree_match,
gtk_css_selector_adjacent_get_change,
gtk_css_selector_adjacent_tree_get_change,
gtk_css_selector_adjacent_compare_one,
FALSE, FALSE, FALSE, FALSE, FALSE
};
/* ANY */
static void
gtk_css_selector_any_print (const GtkCssSelector *selector,
GString *string)
{
g_string_append_c (string, '*');
}
static gboolean
gtk_css_selector_any_match (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
const GtkCssSelector *previous = gtk_css_selector_previous (selector);
if (previous &&
previous->class == &GTK_CSS_SELECTOR_DESCENDANT &&
_gtk_css_matcher_has_regions (matcher))
{
if (gtk_css_selector_match (gtk_css_selector_previous (previous), matcher))
return TRUE;
}
return gtk_css_selector_match (previous, matcher);
}
static void
gtk_css_selector_any_tree_match (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher,
GHashTable *res)
{
const GtkCssSelectorTree *prev;
gtk_css_selector_tree_found_match (tree, res);
for (prev = gtk_css_selector_tree_get_previous (tree);
prev != NULL;
prev = gtk_css_selector_tree_get_sibling (prev))
{
if (prev->selector.class == &GTK_CSS_SELECTOR_DESCENDANT &&
_gtk_css_matcher_has_regions (matcher))
gtk_css_selector_tree_match_previous (prev, matcher, res);
gtk_css_selector_tree_match (prev, matcher, res);
}
}
static GtkCssChange
gtk_css_selector_any_tree_get_change (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
const GtkCssSelectorTree *prev;
GtkCssChange change, previous_change;
change = 0;
if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
change |= GTK_CSS_CHANGE_GOT_MATCH;
previous_change = 0;
for (prev = gtk_css_selector_tree_get_previous (tree);
prev != NULL;
prev = gtk_css_selector_tree_get_sibling (prev))
{
if (prev->selector.class == &GTK_CSS_SELECTOR_DESCENDANT &&
_gtk_css_matcher_has_regions (matcher))
previous_change |= gtk_css_selector_tree_get_previous_change (prev, matcher);
previous_change |= gtk_css_selector_tree_get_change (prev, matcher);
}
if (previous_change != 0)
change |= previous_change | GTK_CSS_CHANGE_GOT_MATCH;
return change;
}
static GtkCssChange
gtk_css_selector_any_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
{
return previous_change;
}
static int
gtk_css_selector_any_compare_one (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return 0;
}
static const GtkCssSelectorClass GTK_CSS_SELECTOR_ANY = {
"any",
gtk_css_selector_any_print,
gtk_css_selector_any_match,
gtk_css_selector_any_tree_match,
gtk_css_selector_any_get_change,
gtk_css_selector_any_tree_get_change,
gtk_css_selector_any_compare_one,
FALSE, FALSE, FALSE, TRUE, TRUE
};
/* NAME */
static void
gtk_css_selector_name_print (const GtkCssSelector *selector,
GString *string)
{
g_string_append (string, selector->data);
}
static gboolean
gtk_css_selector_name_match (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
if (!_gtk_css_matcher_has_name (matcher, selector->data))
return FALSE;
return gtk_css_selector_match (gtk_css_selector_previous (selector), matcher);
}
static void
gtk_css_selector_name_tree_match (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher,
GHashTable *res)
{
if (!_gtk_css_matcher_has_name (matcher, tree->selector.data))
return;
gtk_css_selector_tree_found_match (tree, res);
gtk_css_selector_tree_match_previous (tree, matcher, res);
}
static GtkCssChange
gtk_css_selector_name_tree_get_change (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
GtkCssChange change, previous_change;
if (!_gtk_css_matcher_has_name (matcher, tree->selector.data))
return 0;
change = 0;
if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
change |= GTK_CSS_CHANGE_NAME | GTK_CSS_CHANGE_GOT_MATCH;
previous_change = gtk_css_selector_tree_get_previous_change (tree, matcher);
if (previous_change)
change |= previous_change | GTK_CSS_CHANGE_NAME | GTK_CSS_CHANGE_GOT_MATCH;
return change;
}
static GtkCssChange
gtk_css_selector_name_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
{
return previous_change | GTK_CSS_CHANGE_NAME;
}
static int
gtk_css_selector_name_compare_one (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return strcmp (a->data, b->data);
}
static const GtkCssSelectorClass GTK_CSS_SELECTOR_NAME = {
"name",
gtk_css_selector_name_print,
gtk_css_selector_name_match,
gtk_css_selector_name_tree_match,
gtk_css_selector_name_get_change,
gtk_css_selector_name_tree_get_change,
gtk_css_selector_name_compare_one,
FALSE, FALSE, TRUE, TRUE, FALSE
};
/* REGION */
static void
gtk_css_selector_region_print (const GtkCssSelector *selector,
GString *string)
{
g_string_append (string, selector->data);
}
static gboolean
gtk_css_selector_region_match (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
const GtkCssSelector *previous;
if (!_gtk_css_matcher_has_region (matcher, selector->data, 0))
return FALSE;
previous = gtk_css_selector_previous (selector);
if (previous && previous->class == &GTK_CSS_SELECTOR_DESCENDANT &&
gtk_css_selector_match (gtk_css_selector_previous (previous), matcher))
return TRUE;
return gtk_css_selector_match (previous, matcher);
}
static void
gtk_css_selector_region_tree_match (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher,
GHashTable *res)
{
const GtkCssSelectorTree *prev;
if (!_gtk_css_matcher_has_region (matcher, tree->selector.data, 0))
return;
gtk_css_selector_tree_found_match (tree, res);
for (prev = gtk_css_selector_tree_get_previous (tree);
prev != NULL;
prev = gtk_css_selector_tree_get_sibling (prev))
{
if (prev->selector.class == &GTK_CSS_SELECTOR_DESCENDANT)
gtk_css_selector_tree_match_previous (prev, matcher, res);
gtk_css_selector_tree_match (prev, matcher, res);
}
}
static GtkCssChange
gtk_css_selector_region_tree_get_change (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
const GtkCssSelectorTree *prev;
GtkCssChange change, previous_change;
if (!_gtk_css_matcher_has_region (matcher, tree->selector.data, 0))
return 0;
change = 0;
if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
change |= GTK_CSS_CHANGE_REGION | GTK_CSS_CHANGE_GOT_MATCH;
previous_change = 0;
for (prev = gtk_css_selector_tree_get_previous (tree);
prev != NULL;
prev = gtk_css_selector_tree_get_sibling (prev))
{
if (prev->selector.class == &GTK_CSS_SELECTOR_DESCENDANT)
previous_change |= gtk_css_selector_tree_get_previous_change (prev, matcher);
previous_change |= gtk_css_selector_tree_get_change (prev, matcher);
}
if (previous_change != 0)
{
previous_change |= GTK_CSS_CHANGE_REGION;
previous_change |= _gtk_css_change_for_child (previous_change);
change |= previous_change | GTK_CSS_CHANGE_GOT_MATCH;
}
return change;
}
static GtkCssChange
gtk_css_selector_region_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
{
GtkCssChange change;
change = previous_change;
change |= GTK_CSS_CHANGE_REGION;
change |= _gtk_css_change_for_child (change);
return change;
}
static int
gtk_css_selector_region_compare_one (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return strcmp (a->data, b->data);
}
static const GtkCssSelectorClass GTK_CSS_SELECTOR_REGION = {
"region",
gtk_css_selector_region_print,
gtk_css_selector_region_match,
gtk_css_selector_region_tree_match,
gtk_css_selector_region_get_change,
gtk_css_selector_region_tree_get_change,
gtk_css_selector_region_compare_one,
FALSE, FALSE, TRUE, TRUE, TRUE
};
/* CLASS */
static void
gtk_css_selector_class_print (const GtkCssSelector *selector,
GString *string)
{
g_string_append_c (string, '.');
g_string_append (string, g_quark_to_string (GPOINTER_TO_UINT (selector->data)));
}
static gboolean
gtk_css_selector_class_match (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
if (!_gtk_css_matcher_has_class (matcher, GPOINTER_TO_UINT (selector->data)))
return FALSE;
return gtk_css_selector_match (gtk_css_selector_previous (selector), matcher);
}
static void
gtk_css_selector_class_tree_match (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher,
GHashTable *res)
{
if (!_gtk_css_matcher_has_class (matcher, GPOINTER_TO_UINT (tree->selector.data)))
return;
gtk_css_selector_tree_found_match (tree, res);
gtk_css_selector_tree_match_previous (tree, matcher, res);
}
static GtkCssChange
gtk_css_selector_class_tree_get_change (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
GtkCssChange change, previous_change;
if (!_gtk_css_matcher_has_class (matcher, GPOINTER_TO_UINT (tree->selector.data)))
return 0;
change = 0;
if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
change |= GTK_CSS_CHANGE_CLASS | GTK_CSS_CHANGE_GOT_MATCH;
previous_change = gtk_css_selector_tree_get_previous_change (tree, matcher);
if (previous_change != 0)
change |= previous_change | GTK_CSS_CHANGE_CLASS | GTK_CSS_CHANGE_GOT_MATCH;
return change;
}
static GtkCssChange
gtk_css_selector_class_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
{
return previous_change | GTK_CSS_CHANGE_CLASS;
}
static int
gtk_css_selector_class_compare_one (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return strcmp (g_quark_to_string (GPOINTER_TO_UINT (a->data)),
g_quark_to_string (GPOINTER_TO_UINT (b->data)));
}
static const GtkCssSelectorClass GTK_CSS_SELECTOR_CLASS = {
"class",
gtk_css_selector_class_print,
gtk_css_selector_class_match,
gtk_css_selector_class_tree_match,
gtk_css_selector_class_get_change,
gtk_css_selector_class_tree_get_change,
gtk_css_selector_class_compare_one,
FALSE, TRUE, FALSE, TRUE, FALSE
};
/* ID */
static void
gtk_css_selector_id_print (const GtkCssSelector *selector,
GString *string)
{
g_string_append_c (string, '#');
g_string_append (string, selector->data);
}
static gboolean
gtk_css_selector_id_match (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
if (!_gtk_css_matcher_has_id (matcher, selector->data))
return FALSE;
return gtk_css_selector_match (gtk_css_selector_previous (selector), matcher);
}
static void
gtk_css_selector_id_tree_match (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher,
GHashTable *res)
{
if (!_gtk_css_matcher_has_id (matcher, tree->selector.data))
return;
gtk_css_selector_tree_found_match (tree, res);
gtk_css_selector_tree_match_previous (tree, matcher, res);
}
static GtkCssChange
gtk_css_selector_id_tree_get_change (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
GtkCssChange change, previous_change;
if (!_gtk_css_matcher_has_id (matcher, tree->selector.data))
return 0;
change = 0;
if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
change |= GTK_CSS_CHANGE_ID | GTK_CSS_CHANGE_GOT_MATCH;
previous_change = gtk_css_selector_tree_get_previous_change (tree, matcher);
if (previous_change != 0)
change |= previous_change | GTK_CSS_CHANGE_ID | GTK_CSS_CHANGE_GOT_MATCH;
return change;
}
static GtkCssChange
gtk_css_selector_id_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
{
return previous_change | GTK_CSS_CHANGE_ID;
}
static int
gtk_css_selector_id_compare_one (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return strcmp (a->data, b->data);
}
static const GtkCssSelectorClass GTK_CSS_SELECTOR_ID = {
"id",
gtk_css_selector_id_print,
gtk_css_selector_id_match,
gtk_css_selector_id_tree_match,
gtk_css_selector_id_get_change,
gtk_css_selector_id_tree_get_change,
gtk_css_selector_id_compare_one,
TRUE, FALSE, FALSE, TRUE, FALSE
};
/* PSEUDOCLASS FOR STATE */
static void
gtk_css_selector_pseudoclass_state_print (const GtkCssSelector *selector,
GString *string)
{
static const char * state_names[] = {
"active",
"hover",
"selected",
"insensitive",
"inconsistent",
"focus",
"backdrop"
};
guint i, state;
state = GPOINTER_TO_UINT (selector->data);
g_string_append_c (string, ':');
for (i = 0; i < G_N_ELEMENTS (state_names); i++)
{
if (state == (1 << i))
{
g_string_append (string, state_names[i]);
return;
}
}
g_assert_not_reached ();
}
static gboolean
gtk_css_selector_pseudoclass_state_match (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
GtkStateFlags state = GPOINTER_TO_UINT (selector->data);
if ((_gtk_css_matcher_get_state (matcher) & state) != state)
return FALSE;
return gtk_css_selector_match (gtk_css_selector_previous (selector), matcher);
}
static void
gtk_css_selector_pseudoclass_state_tree_match (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher,
GHashTable *res)
{
GtkStateFlags state = GPOINTER_TO_UINT (tree->selector.data);
if ((_gtk_css_matcher_get_state (matcher) & state) != state)
return;
gtk_css_selector_tree_found_match (tree, res);
gtk_css_selector_tree_match_previous (tree, matcher, res);
}
static GtkCssChange
gtk_css_selector_pseudoclass_state_tree_get_change (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
GtkStateFlags state = GPOINTER_TO_UINT (tree->selector.data);
GtkCssChange change, previous_change;
if ((_gtk_css_matcher_get_state (matcher) & state) != state)
return 0;
change = 0;
if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
change |= GTK_CSS_CHANGE_STATE | GTK_CSS_CHANGE_GOT_MATCH;
previous_change = gtk_css_selector_tree_get_previous_change (tree, matcher);
if (previous_change != 0)
change |= previous_change | GTK_CSS_CHANGE_STATE | GTK_CSS_CHANGE_GOT_MATCH;
return change;
}
static GtkCssChange
gtk_css_selector_pseudoclass_state_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
{
return previous_change | GTK_CSS_CHANGE_STATE;
}
static int
gtk_css_selector_pseudoclass_state_compare_one (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return GPOINTER_TO_UINT (a->data) - GPOINTER_TO_UINT (b->data);
}
static const GtkCssSelectorClass GTK_CSS_SELECTOR_PSEUDOCLASS_STATE = {
"pseudoclass-state",
gtk_css_selector_pseudoclass_state_print,
gtk_css_selector_pseudoclass_state_match,
gtk_css_selector_pseudoclass_state_tree_match,
gtk_css_selector_pseudoclass_state_get_change,
gtk_css_selector_pseudoclass_state_tree_get_change,
gtk_css_selector_pseudoclass_state_compare_one,
FALSE, TRUE, FALSE, TRUE, FALSE
};
/* PSEUDOCLASS FOR POSITION */
typedef enum {
POSITION_FORWARD,
POSITION_BACKWARD,
POSITION_ONLY,
POSITION_SORTED
} PositionType;
#define POSITION_TYPE_BITS 2
#define POSITION_NUMBER_BITS ((sizeof (gpointer) * 8 - POSITION_TYPE_BITS) / 2)
static gconstpointer
encode_position (PositionType type,
int a,
int b)
{
union {
gconstpointer p;
struct {
gssize type :POSITION_TYPE_BITS;
gssize a :POSITION_NUMBER_BITS;
gssize b :POSITION_NUMBER_BITS;
} data;
} result;
G_STATIC_ASSERT (sizeof (gconstpointer) == sizeof (result));
g_assert (type < (1 << POSITION_TYPE_BITS));
result.data.type = type;
result.data.a = a;
result.data.b = b;
return result.p;
}
static void
decode_position (const GtkCssSelector *selector,
PositionType *type,
int *a,
int *b)
{
union {
gconstpointer p;
struct {
gssize type :POSITION_TYPE_BITS;
gssize a :POSITION_NUMBER_BITS;
gssize b :POSITION_NUMBER_BITS;
} data;
} result;
G_STATIC_ASSERT (sizeof (gconstpointer) == sizeof (result));
result.p = selector->data;
*type = result.data.type & ((1 << POSITION_TYPE_BITS) - 1);
*a = result.data.a;
*b = result.data.b;
}
static void
gtk_css_selector_pseudoclass_position_print (const GtkCssSelector *selector,
GString *string)
{
PositionType type;
int a, b;
decode_position (selector, &type, &a, &b);
switch (type)
{
case POSITION_FORWARD:
if (a == 0)
{
if (b == 1)
g_string_append (string, ":first-child");
else
g_string_append_printf (string, ":nth-child(%d)", b);
}
else if (a == 2 && b == 0)
g_string_append (string, ":nth-child(even)");
else if (a == 2 && b == 1)
g_string_append (string, ":nth-child(odd)");
else
{
g_string_append (string, ":nth-child(");
if (a == 1)
g_string_append (string, "n");
else if (a == -1)
g_string_append (string, "-n");
else
g_string_append_printf (string, "%dn", a);
if (b > 0)
g_string_append_printf (string, "+%d)", b);
else if (b < 0)
g_string_append_printf (string, "%d)", b);
else
g_string_append (string, ")");
}
break;
case POSITION_BACKWARD:
if (a == 0)
{
if (b == 1)
g_string_append (string, ":last-child");
else
g_string_append_printf (string, ":nth-last-child(%d)", b);
}
else if (a == 2 && b == 0)
g_string_append (string, ":nth-last-child(even)");
else if (a == 2 && b == 1)
g_string_append (string, ":nth-last-child(odd)");
else
{
g_string_append (string, ":nth-last-child(");
if (a == 1)
g_string_append (string, "n");
else if (a == -1)
g_string_append (string, "-n");
else
g_string_append_printf (string, "%dn", a);
if (b > 0)
g_string_append_printf (string, "+%d)", b);
else if (b < 0)
g_string_append_printf (string, "%d)", b);
else
g_string_append (string, ")");
}
break;
case POSITION_ONLY:
g_string_append (string, ":only-child");
break;
case POSITION_SORTED:
g_string_append (string, ":sorted");
break;
default:
g_assert_not_reached ();
break;
}
}
static gboolean
get_selector_flags_for_position_region_match (const GtkCssSelector *selector, GtkRegionFlags *selector_flags)
{
PositionType type;
int a, b;
decode_position (selector, &type, &a, &b);
switch (type)
{
case POSITION_FORWARD:
if (a == 0 && b == 1)
*selector_flags = GTK_REGION_FIRST;
else if (a == 2 && b == 0)
*selector_flags = GTK_REGION_EVEN;
else if (a == 2 && b == 1)
*selector_flags = GTK_REGION_ODD;
else
return FALSE;
break;
case POSITION_BACKWARD:
if (a == 0 && b == 1)
*selector_flags = GTK_REGION_LAST;
else
return FALSE;
break;
case POSITION_ONLY:
*selector_flags = GTK_REGION_ONLY;
break;
case POSITION_SORTED:
*selector_flags = GTK_REGION_SORTED;
break;
default:
g_assert_not_reached ();
break;
}
return TRUE;
}
static gboolean
gtk_css_selector_pseudoclass_position_match_for_region (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
GtkRegionFlags selector_flags;
const GtkCssSelector *previous;
if (!get_selector_flags_for_position_region_match (selector, &selector_flags))
return FALSE;
selector = gtk_css_selector_previous (selector);
if (!_gtk_css_matcher_has_region (matcher, selector->data, selector_flags))
return FALSE;
previous = gtk_css_selector_previous (selector);
if (previous && previous->class == &GTK_CSS_SELECTOR_DESCENDANT &&
gtk_css_selector_match (gtk_css_selector_previous (previous), matcher))
return TRUE;
return gtk_css_selector_match (previous, matcher);
}
static gboolean
get_position_match (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
PositionType type;
int a, b;
decode_position (selector, &type, &a, &b);
switch (type)
{
case POSITION_FORWARD:
if (!_gtk_css_matcher_has_position (matcher, TRUE, a, b))
return FALSE;
break;
case POSITION_BACKWARD:
if (!_gtk_css_matcher_has_position (matcher, FALSE, a, b))
return FALSE;
break;
case POSITION_ONLY:
if (!_gtk_css_matcher_has_position (matcher, TRUE, 0, 1) ||
!_gtk_css_matcher_has_position (matcher, FALSE, 0, 1))
return FALSE;
break;
case POSITION_SORTED:
return FALSE;
default:
g_assert_not_reached ();
return FALSE;
}
return TRUE;
}
static gboolean
gtk_css_selector_pseudoclass_position_match (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
const GtkCssSelector *previous;
previous = gtk_css_selector_previous (selector);
if (previous && previous->class == &GTK_CSS_SELECTOR_REGION)
return gtk_css_selector_pseudoclass_position_match_for_region (selector, matcher);
if (!get_position_match (selector, matcher))
return FALSE;
return gtk_css_selector_match (previous, matcher);
}
static void
gtk_css_selector_pseudoclass_position_tree_match_for_region (const GtkCssSelectorTree *tree,
const GtkCssSelectorTree *prev,
const GtkCssMatcher *matcher,
GHashTable *res)
{
const GtkCssSelectorTree *prev2;
GtkRegionFlags selector_flags;
if (!get_selector_flags_for_position_region_match (&tree->selector, &selector_flags))
return;
if (!_gtk_css_matcher_has_region (matcher, prev->selector.data, selector_flags))
return;
gtk_css_selector_tree_found_match (prev, res);
for (prev2 = gtk_css_selector_tree_get_previous (prev);
prev2 != NULL;
prev2 = gtk_css_selector_tree_get_sibling (prev2))
{
if (prev2->selector.class == &GTK_CSS_SELECTOR_DESCENDANT)
gtk_css_selector_tree_match (gtk_css_selector_tree_get_previous (prev2), matcher, res);
gtk_css_selector_tree_match (prev2, matcher, res);
}
}
static void
gtk_css_selector_pseudoclass_position_tree_match (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher,
GHashTable *res)
{
const GtkCssSelectorTree *prev;
for (prev = gtk_css_selector_tree_get_previous (tree);
prev != NULL;
prev = gtk_css_selector_tree_get_sibling (prev))
{
if (prev->selector.class == &GTK_CSS_SELECTOR_REGION)
gtk_css_selector_pseudoclass_position_tree_match_for_region (tree, prev, matcher, res);
}
if (!get_position_match (&tree->selector, matcher))
return;
gtk_css_selector_tree_found_match (tree, res);
for (prev = gtk_css_selector_tree_get_previous (tree); prev != NULL; prev = gtk_css_selector_tree_get_sibling (prev))
{
if (prev->selector.class != &GTK_CSS_SELECTOR_REGION)
gtk_css_selector_tree_match (prev, matcher, res);
}
}
static GtkCssChange
gtk_css_selector_pseudoclass_position_tree_get_change_for_region (const GtkCssSelectorTree *tree,
const GtkCssSelectorTree *prev,
const GtkCssMatcher *matcher)
{
const GtkCssSelectorTree *prev2;
GtkRegionFlags selector_flags;
GtkCssChange change, previous_change;
if (!get_selector_flags_for_position_region_match (&tree->selector, &selector_flags))
return 0;
if (!_gtk_css_matcher_has_region (matcher, prev->selector.data, selector_flags))
return 0;
change = 0;
if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
change |= GTK_CSS_CHANGE_POSITION | GTK_CSS_CHANGE_GOT_MATCH;
previous_change = 0;
for (prev2 = gtk_css_selector_tree_get_previous (prev);
prev2 != NULL;
prev2 = gtk_css_selector_tree_get_sibling (prev2))
{
if (prev2->selector.class == &GTK_CSS_SELECTOR_DESCENDANT)
previous_change |= gtk_css_selector_tree_get_change (gtk_css_selector_tree_get_previous (prev2), matcher);
previous_change |= gtk_css_selector_tree_get_change (prev2, matcher);
}
if (previous_change != 0)
change |= previous_change | GTK_CSS_CHANGE_POSITION | GTK_CSS_CHANGE_GOT_MATCH;
return change;
}
static GtkCssChange
gtk_css_selector_pseudoclass_position_tree_get_change (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
const GtkCssSelectorTree *prev;
GtkCssChange change, previous_change;
change = 0;
for (prev = gtk_css_selector_tree_get_previous (tree);
prev != NULL;
prev = gtk_css_selector_tree_get_sibling (prev))
{
if (prev->selector.class == &GTK_CSS_SELECTOR_REGION)
change |= gtk_css_selector_pseudoclass_position_tree_get_change_for_region (tree, prev, matcher);
}
if (!get_position_match (&tree->selector, matcher))
return change;
if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
change |= GTK_CSS_CHANGE_POSITION | GTK_CSS_CHANGE_GOT_MATCH;
previous_change = 0;
for (prev = gtk_css_selector_tree_get_previous (tree); prev != NULL; prev = gtk_css_selector_tree_get_sibling (prev))
{
if (prev->selector.class != &GTK_CSS_SELECTOR_REGION)
previous_change |= gtk_css_selector_tree_get_change (prev, matcher);
}
if (previous_change != 0)
change |= previous_change | GTK_CSS_CHANGE_POSITION | GTK_CSS_CHANGE_GOT_MATCH;
return change;
}
static GtkCssChange
gtk_css_selector_pseudoclass_position_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
{
return previous_change | GTK_CSS_CHANGE_POSITION;
}
static int
gtk_css_selector_pseudoclass_position_compare_one (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return GPOINTER_TO_UINT (a->data) - GPOINTER_TO_UINT (b->data);
}
static const GtkCssSelectorClass GTK_CSS_SELECTOR_PSEUDOCLASS_POSITION = {
"pseudoclass-position",
gtk_css_selector_pseudoclass_position_print,
gtk_css_selector_pseudoclass_position_match,
gtk_css_selector_pseudoclass_position_tree_match,
gtk_css_selector_pseudoclass_position_get_change,
gtk_css_selector_pseudoclass_position_tree_get_change,
gtk_css_selector_pseudoclass_position_compare_one,
FALSE, TRUE, FALSE, TRUE, TRUE
};
/* API */
static guint
gtk_css_selector_size (const GtkCssSelector *selector)
{
guint size = 0;
while (selector)
{
selector = gtk_css_selector_previous (selector);
size++;
}
return size;
}
static GtkCssSelector *
gtk_css_selector_new (const GtkCssSelectorClass *class,
GtkCssSelector *selector,
gconstpointer data)
{
guint size;
size = gtk_css_selector_size (selector);
selector = g_realloc (selector, sizeof (GtkCssSelector) * (size + 1) + sizeof (gpointer));
if (size == 0)
selector[1].class = NULL;
else
memmove (selector + 1, selector, sizeof (GtkCssSelector) * size + sizeof (gpointer));
selector->class = class;
selector->data = data;
return selector;
}
static GtkCssSelector *
parse_selector_class (GtkCssParser *parser, GtkCssSelector *selector)
{
char *name;
name = _gtk_css_parser_try_name (parser, FALSE);
if (name == NULL)
{
_gtk_css_parser_error (parser, "Expected a valid name for class");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_CLASS,
selector,
GUINT_TO_POINTER (g_quark_from_string (name)));
g_free (name);
return selector;
}
static GtkCssSelector *
parse_selector_id (GtkCssParser *parser, GtkCssSelector *selector)
{
char *name;
name = _gtk_css_parser_try_name (parser, FALSE);
if (name == NULL)
{
_gtk_css_parser_error (parser, "Expected a valid name for id");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_ID,
selector,
g_intern_string (name));
g_free (name);
return selector;
}
static GtkCssSelector *
parse_selector_pseudo_class_nth_child (GtkCssParser *parser,
GtkCssSelector *selector,
PositionType type)
{
int a, b;
if (!_gtk_css_parser_try (parser, "(", TRUE))
{
_gtk_css_parser_error (parser, "Missing opening bracket for pseudo-class");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
if (_gtk_css_parser_try (parser, "even", TRUE))
{
a = 2;
b = 0;
}
else if (_gtk_css_parser_try (parser, "odd", TRUE))
{
a = 2;
b = 1;
}
else if (type == POSITION_FORWARD &&
_gtk_css_parser_try (parser, "first", TRUE))
{
a = 0;
b = 1;
}
else if (type == POSITION_FORWARD &&
_gtk_css_parser_try (parser, "last", TRUE))
{
a = 0;
b = 1;
type = POSITION_BACKWARD;
}
else
{
int multiplier;
if (_gtk_css_parser_try (parser, "+", TRUE))
multiplier = 1;
else if (_gtk_css_parser_try (parser, "-", TRUE))
multiplier = -1;
else
multiplier = 1;
if (_gtk_css_parser_try_int (parser, &a))
{
if (a < 0)
{
_gtk_css_parser_error (parser, "Expected an integer");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
a *= multiplier;
}
else if (_gtk_css_parser_has_prefix (parser, "n"))
{
a = multiplier;
}
else
{
_gtk_css_parser_error (parser, "Expected an integer");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
if (_gtk_css_parser_try (parser, "n", TRUE))
{
if (_gtk_css_parser_try (parser, "+", TRUE))
multiplier = 1;
else if (_gtk_css_parser_try (parser, "-", TRUE))
multiplier = -1;
else
multiplier = 1;
if (_gtk_css_parser_try_int (parser, &b))
{
if (b < 0)
{
_gtk_css_parser_error (parser, "Expected an integer");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
}
else
b = 0;
b *= multiplier;
}
else
{
b = a;
a = 0;
}
}
if (!_gtk_css_parser_try (parser, ")", FALSE))
{
_gtk_css_parser_error (parser, "Missing closing bracket for pseudo-class");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_PSEUDOCLASS_POSITION,
selector,
encode_position (type, a, b));
return selector;
}
static GtkCssSelector *
parse_selector_pseudo_class (GtkCssParser *parser,
GtkCssSelector *selector)
{
static const struct {
const char *name;
GtkStateFlags state_flag;
PositionType position_type;
int position_a;
int position_b;
} pseudo_classes[] = {
{ "first-child", 0, POSITION_FORWARD, 0, 1 },
{ "last-child", 0, POSITION_BACKWARD, 0, 1 },
{ "only-child", 0, POSITION_ONLY, 0, 0 },
{ "sorted", 0, POSITION_SORTED, 0, 0 },
{ "active", GTK_STATE_FLAG_ACTIVE, },
{ "prelight", GTK_STATE_FLAG_PRELIGHT, },
{ "hover", GTK_STATE_FLAG_PRELIGHT, },
{ "selected", GTK_STATE_FLAG_SELECTED, },
{ "insensitive", GTK_STATE_FLAG_INSENSITIVE, },
{ "inconsistent", GTK_STATE_FLAG_INCONSISTENT, },
{ "focused", GTK_STATE_FLAG_FOCUSED, },
{ "focus", GTK_STATE_FLAG_FOCUSED, },
{ "backdrop", GTK_STATE_FLAG_BACKDROP, }
};
guint i;
if (_gtk_css_parser_try (parser, "nth-child", FALSE))
return parse_selector_pseudo_class_nth_child (parser, selector, POSITION_FORWARD);
else if (_gtk_css_parser_try (parser, "nth-last-child", FALSE))
return parse_selector_pseudo_class_nth_child (parser, selector, POSITION_BACKWARD);
for (i = 0; i < G_N_ELEMENTS (pseudo_classes); i++)
{
if (_gtk_css_parser_try (parser, pseudo_classes[i].name, FALSE))
{
if (pseudo_classes[i].state_flag)
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_PSEUDOCLASS_STATE,
selector,
GUINT_TO_POINTER (pseudo_classes[i].state_flag));
else
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_PSEUDOCLASS_POSITION,
selector,
encode_position (pseudo_classes[i].position_type,
pseudo_classes[i].position_a,
pseudo_classes[i].position_b));
return selector;
}
}
_gtk_css_parser_error (parser, "Missing name of pseudo-class");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
static GtkCssSelector *
try_parse_name (GtkCssParser *parser,
GtkCssSelector *selector)
{
char *name;
name = _gtk_css_parser_try_ident (parser, FALSE);
if (name)
{
selector = gtk_css_selector_new (_gtk_style_context_check_region_name (name)
? &GTK_CSS_SELECTOR_REGION
: &GTK_CSS_SELECTOR_NAME,
selector,
g_intern_string (name));
g_free (name);
}
else if (_gtk_css_parser_try (parser, "*", FALSE))
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_ANY, selector, NULL);
return selector;
}
static GtkCssSelector *
parse_simple_selector (GtkCssParser *parser,
GtkCssSelector *selector)
{
guint size = gtk_css_selector_size (selector);
selector = try_parse_name (parser, selector);
do {
if (_gtk_css_parser_try (parser, "#", FALSE))
selector = parse_selector_id (parser, selector);
else if (_gtk_css_parser_try (parser, ".", FALSE))
selector = parse_selector_class (parser, selector);
else if (_gtk_css_parser_try (parser, ":", FALSE))
selector = parse_selector_pseudo_class (parser, selector);
else if (gtk_css_selector_size (selector) == size)
{
_gtk_css_parser_error (parser, "Expected a valid selector");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
else
break;
}
while (selector && !_gtk_css_parser_is_eof (parser));
_gtk_css_parser_skip_whitespace (parser);
return selector;
}
GtkCssSelector *
_gtk_css_selector_parse (GtkCssParser *parser)
{
GtkCssSelector *selector = NULL;
while ((selector = parse_simple_selector (parser, selector)) &&
!_gtk_css_parser_is_eof (parser) &&
!_gtk_css_parser_begins_with (parser, ',') &&
!_gtk_css_parser_begins_with (parser, '{'))
{
if (_gtk_css_parser_try (parser, "+", TRUE))
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_ADJACENT, selector, NULL);
else if (_gtk_css_parser_try (parser, "~", TRUE))
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_SIBLING, selector, NULL);
else if (_gtk_css_parser_try (parser, ">", TRUE))
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_CHILD, selector, NULL);
else
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_DESCENDANT, selector, NULL);
}
return selector;
}
void
_gtk_css_selector_free (GtkCssSelector *selector)
{
g_return_if_fail (selector != NULL);
g_free (selector);
}
void
_gtk_css_selector_print (const GtkCssSelector *selector,
GString * str)
{
const GtkCssSelector *previous;
g_return_if_fail (selector != NULL);
previous = gtk_css_selector_previous (selector);
if (previous)
_gtk_css_selector_print (previous, str);
selector->class->print (selector, str);
}
char *
_gtk_css_selector_to_string (const GtkCssSelector *selector)
{
GString *string;
g_return_val_if_fail (selector != NULL, NULL);
string = g_string_new (NULL);
_gtk_css_selector_print (selector, string);
return g_string_free (string, FALSE);
}
GtkCssChange
_gtk_css_selector_tree_match_get_change (const GtkCssSelectorTree *tree)
{
GtkCssChange change = 0;
while (tree)
{
change = tree->selector.class->get_change (&tree->selector, change);
tree = gtk_css_selector_tree_get_parent (tree);
}
return change;
}
/**
* _gtk_css_selector_matches:
* @selector: the selector
* @path: the path to check
* @state: The state to match
*
* Checks if the @selector matches the given @path. If @length is
* smaller than the number of elements in @path, it is assumed that
* only the first @length element of @path are valid and the rest
* does not exist. This is useful for doing parent matches for the
* 'inherit' keyword.
*
* Returns: %TRUE if the selector matches @path
**/
gboolean
_gtk_css_selector_matches (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
g_return_val_if_fail (selector != NULL, FALSE);
g_return_val_if_fail (matcher != NULL, FALSE);
return gtk_css_selector_match (selector, matcher);
}
/* Computes specificity according to CSS 2.1.
* The arguments must be initialized to 0 */
static void
_gtk_css_selector_get_specificity (const GtkCssSelector *selector,
guint *ids,
guint *classes,
guint *elements)
{
for (; selector; selector = gtk_css_selector_previous (selector))
{
const GtkCssSelectorClass *klass = selector->class;
if (klass->increase_id_specificity)
(*ids)++;
if (klass->increase_class_specificity)
(*classes)++;
if (klass->increase_element_specificity)
(*elements)++;
}
}
int
_gtk_css_selector_compare (const GtkCssSelector *a,
const GtkCssSelector *b)
{
guint a_ids = 0, a_classes = 0, a_elements = 0;
guint b_ids = 0, b_classes = 0, b_elements = 0;
int compare;
_gtk_css_selector_get_specificity (a, &a_ids, &a_classes, &a_elements);
_gtk_css_selector_get_specificity (b, &b_ids, &b_classes, &b_elements);
compare = a_ids - b_ids;
if (compare)
return compare;
compare = a_classes - b_classes;
if (compare)
return compare;
return a_elements - b_elements;
}
/******************** SelectorTree handling *****************/
static GHashTable *
gtk_css_selectors_count_initial_init (void)
{
return g_hash_table_new ((GHashFunc)gtk_css_selector_hash, (GEqualFunc)gtk_css_selector_equal);
}
static void
gtk_css_selectors_count_initial (const GtkCssSelector *selector, GHashTable *hash)
{
if (!selector->class->is_simple || selector->class->must_keep_order)
{
guint count = GPOINTER_TO_INT (g_hash_table_lookup (hash, selector));
g_hash_table_replace (hash, (gpointer)selector, GUINT_TO_POINTER (count + 1));
return;
}
for (;
selector && selector->class->is_simple && !selector->class->must_keep_order;
selector = gtk_css_selector_previous (selector))
{
guint count = GPOINTER_TO_INT (g_hash_table_lookup (hash, selector));
g_hash_table_replace (hash, (gpointer)selector, GUINT_TO_POINTER (count + 1));
}
}
static gboolean
gtk_css_selectors_has_initial_selector (const GtkCssSelector *selector, const GtkCssSelector *initial)
{
if (!selector->class->is_simple || selector->class->must_keep_order)
return gtk_css_selector_equal (selector, initial);
for (;
selector && selector->class->is_simple && !selector->class->must_keep_order;
selector = gtk_css_selector_previous (selector))
{
if (gtk_css_selector_equal (selector, initial))
return TRUE;
}
return FALSE;
}
static GtkCssSelector *
gtk_css_selectors_skip_initial_selector (GtkCssSelector *selector, const GtkCssSelector *initial)
{
GtkCssSelector *found;
GtkCssSelector tmp;
/* If the initial simple selector is not first, move it there so we can skip it
without losing any other selectors */
if (!gtk_css_selector_equal (selector, initial))
{
for (found = selector; found && found->class->is_simple; found = (GtkCssSelector *)gtk_css_selector_previous (found))
{
if (gtk_css_selector_equal (found, initial))
break;
}
g_assert (found != NULL && found->class->is_simple);
tmp = *found;
*found = *selector;
*selector = tmp;
}
return (GtkCssSelector *)gtk_css_selector_previous (selector);
}
static int
direct_ptr_compare (const void *_a, const void *_b)
{
gpointer *a = (gpointer *)_a;
gpointer *b = (gpointer *)_b;
if (*a < *b)
return -1;
else if (*a == *b)
return 0;
return 1;
}
GPtrArray *
_gtk_css_selector_tree_match_all (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
GHashTable *res;
GPtrArray *array;
GHashTableIter iter;
gpointer key;
res = g_hash_table_new (g_direct_hash, g_direct_equal);
for (; tree != NULL;
tree = gtk_css_selector_tree_get_sibling (tree))
gtk_css_selector_tree_match (tree, matcher, res);
array = g_ptr_array_sized_new (g_hash_table_size (res));
g_hash_table_iter_init (&iter, res);
while (g_hash_table_iter_next (&iter, &key, NULL))
g_ptr_array_add (array, key);
g_hash_table_destroy (res);
qsort (array->pdata, array->len, sizeof (gpointer), direct_ptr_compare);
return array;
}
GtkCssChange
_gtk_css_selector_tree_get_change_all (const GtkCssSelectorTree *tree,
const GtkCssMatcher *matcher)
{
GtkCssChange change;
change = 0;
for (; tree != NULL;
tree = gtk_css_selector_tree_get_sibling (tree))
change |= gtk_css_selector_tree_get_change (tree, matcher);
/* Never return reserved bit set */
return change & ~GTK_CSS_CHANGE_RESERVED_BIT;
}
#ifdef PRINT_TREE
static void
_gtk_css_selector_tree_print (GtkCssSelectorTree *tree, GString *str, char *prefix)
{
gboolean first = TRUE;
int len, i;
for (; tree != NULL; tree = tree->siblings, first = FALSE)
{
if (!first)
g_string_append (str, prefix);
if (first)
{
if (tree->siblings)
g_string_append (str, "─┬─");
else
g_string_append (str, "───");
}
else
{
if (tree->siblings)
g_string_append (str, " ├─");
else
g_string_append (str, " └─");
}
len = str->len;
tree->selector.class->print (&tree->selector, str);
len = str->len - len;
if (gtk_css_selector_tree_get_previous (tree))
{
GString *prefix2 = g_string_new (prefix);
if (tree->siblings)
g_string_append (prefix2, " │ ");
else
g_string_append (prefix2, " ");
for (i = 0; i < len; i++)
g_string_append_c (prefix2, ' ');
_gtk_css_selector_tree_print (gtk_css_selector_tree_get_previous (tree), str, prefix2->str);
g_string_free (prefix2, TRUE);
}
else
g_string_append (str, "\n");
}
}
#endif
void
_gtk_css_selector_tree_match_print (const GtkCssSelectorTree *tree,
GString *str)
{
const GtkCssSelectorTree *parent;
g_return_if_fail (tree != NULL);
tree->selector.class->print (&tree->selector, str);
parent = gtk_css_selector_tree_get_parent (tree);
if (parent != NULL)
_gtk_css_selector_tree_match_print (parent, str);
}
void
_gtk_css_selector_tree_free (GtkCssSelectorTree *tree)
{
if (tree == NULL)
return;
g_free (tree);
}
typedef struct {
gpointer match;
GtkCssSelector *current_selector;
GtkCssSelectorTree **selector_match;
} GtkCssSelectorRuleSetInfo;
static GtkCssSelectorTree *
get_tree (GByteArray *array, gint32 offset)
{
return (GtkCssSelectorTree *) (array->data + offset);
}
static GtkCssSelectorTree *
alloc_tree (GByteArray *array, gint32 *offset)
{
GtkCssSelectorTree tree = { { NULL} };
*offset = array->len;
g_byte_array_append (array, (guint8 *)&tree, sizeof (GtkCssSelectorTree));
return get_tree (array, *offset);
}
static gint32
subdivide_infos (GByteArray *array, GList *infos, gint32 parent_offset)
{
GHashTable *ht;
GList *l;
GList *matched;
GList *remaining;
gint32 tree_offset;
GtkCssSelectorTree *tree;
GtkCssSelectorRuleSetInfo *info;
GtkCssSelector max_selector;
GHashTableIter iter;
guint max_count;
gpointer key, value;
GPtrArray *exact_matches;
gint32 res;
if (infos == NULL)
return GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET;
ht = gtk_css_selectors_count_initial_init ();
for (l = infos; l != NULL; l = l->next)
{
info = l->data;
gtk_css_selectors_count_initial (info->current_selector, ht);
}
/* Pick the selector with highest count, and use as decision on this level
as that makes it possible to skip the largest amount of checks later */
max_count = 0;
g_hash_table_iter_init (&iter, ht);
while (g_hash_table_iter_next (&iter, &key, &value))
{
GtkCssSelector *selector = key;
if (GPOINTER_TO_UINT (value) > max_count ||
(GPOINTER_TO_UINT (value) == max_count &&
gtk_css_selector_compare_one (selector, &max_selector) < 0))
{
max_count = GPOINTER_TO_UINT (value);
max_selector = *selector;
}
}
matched = NULL;
remaining = NULL;
tree = alloc_tree (array, &tree_offset);
tree->parent_offset = parent_offset;
tree->selector = max_selector;
exact_matches = NULL;
for (l = infos; l != NULL; l = l->next)
{
info = l->data;
if (gtk_css_selectors_has_initial_selector (info->current_selector, &max_selector))
{
info->current_selector = gtk_css_selectors_skip_initial_selector (info->current_selector, &max_selector);
if (info->current_selector == NULL)
{
/* Matches current node */
if (exact_matches == NULL)
exact_matches = g_ptr_array_new ();
g_ptr_array_add (exact_matches, info->match);
if (info->selector_match != NULL)
*info->selector_match = GUINT_TO_POINTER (tree_offset);
}
else
matched = g_list_prepend (matched, info);
}
else
{
remaining = g_list_prepend (remaining, info);
}
}
if (exact_matches)
{
g_ptr_array_add (exact_matches, NULL); /* Null terminate */
res = array->len;
g_byte_array_append (array, (guint8 *)exact_matches->pdata,
exact_matches->len * sizeof (gpointer));
g_ptr_array_free (exact_matches, TRUE);
}
else
res = GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET;
get_tree (array, tree_offset)->matches_offset = res;
res = subdivide_infos (array, matched, tree_offset);
get_tree (array, tree_offset)->previous_offset = res;
res = subdivide_infos (array, remaining, parent_offset);
get_tree (array, tree_offset)->sibling_offset = res;
g_list_free (matched);
g_list_free (remaining);
g_hash_table_unref (ht);
return tree_offset;
}
struct _GtkCssSelectorTreeBuilder {
GList *infos;
};
GtkCssSelectorTreeBuilder *
_gtk_css_selector_tree_builder_new (void)
{
return g_new0 (GtkCssSelectorTreeBuilder, 1);
}
void
_gtk_css_selector_tree_builder_free (GtkCssSelectorTreeBuilder *builder)
{
g_list_free_full (builder->infos, g_free);
g_free (builder);
}
void
_gtk_css_selector_tree_builder_add (GtkCssSelectorTreeBuilder *builder,
GtkCssSelector *selectors,
GtkCssSelectorTree **selector_match,
gpointer match)
{
GtkCssSelectorRuleSetInfo *info = g_new0 (GtkCssSelectorRuleSetInfo, 1);
info->match = match;
info->current_selector = selectors;
info->selector_match = selector_match;
builder->infos = g_list_prepend (builder->infos, info);
}
/* Convert all offsets to node-relative */
static void
fixup_offsets (GtkCssSelectorTree *tree, guint8 *data)
{
while (tree != NULL)
{
if (tree->parent_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
tree->parent_offset -= ((guint8 *)tree - data);
if (tree->previous_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
tree->previous_offset -= ((guint8 *)tree - data);
if (tree->sibling_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
tree->sibling_offset -= ((guint8 *)tree - data);
if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
tree->matches_offset -= ((guint8 *)tree - data);
fixup_offsets ((GtkCssSelectorTree *)gtk_css_selector_tree_get_previous (tree), data);
tree = (GtkCssSelectorTree *)gtk_css_selector_tree_get_sibling (tree);
}
}
GtkCssSelectorTree *
_gtk_css_selector_tree_builder_build (GtkCssSelectorTreeBuilder *builder)
{
GtkCssSelectorTree *tree;
GByteArray *array;
guint8 *data;
guint len;
GList *l;
GtkCssSelectorRuleSetInfo *info;
array = g_byte_array_new ();
subdivide_infos (array, builder->infos, GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET);
len = array->len;
data = g_byte_array_free (array, FALSE);
/* shrink to final size */
data = g_realloc (data, len);
tree = (GtkCssSelectorTree *)data;
fixup_offsets (tree, data);
/* Convert offsets to final pointers */
for (l = builder->infos; l != NULL; l = l->next)
{
info = l->data;
if (info->selector_match)
*info->selector_match = (GtkCssSelectorTree *)(data + GPOINTER_TO_UINT (*info->selector_match));
}
#ifdef PRINT_TREE
{
GString *s = g_string_new ("");
_gtk_css_selector_tree_print (tree, s, "");
g_print ("%s", s->str);
g_string_free (s, TRUE);
}
#endif
return tree;
}
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