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gtk2/gtk/gtkcssselector.c
Matthias Clasen 46e0fde606 css: Avoid more allocations for tokens 
Make short string tokens static.
2023-01-12 00:12:09 -05:00

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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 "gtkcssnodeprivate.h"
#include <stdlib.h>
#include <string.h>
#include "gtkcssprovider.h"
#include <errno.h>
#if defined(_MSC_VER) && _MSC_VER >= 1500
# include <intrin.h>
#endif
/*
* @GTK_CSS_SELECTOR_CATEGORY_SIMPLE: A simple selector
* @GTK_CSS_SELECTOR_CATEGORY_SIMPLE_RADICAL: A simple selector that matches
* what change tracking considers a "radical change"
* @GTK_CSS_SELECTOR_SIBLING: A selector matching siblings
* @GTK_CSS_SELECTOR_CATEGORY_PARENT: A selector matching a parent or other
* ancestor
*
* Categorize the selectors. This helps in various loops when matching.
*/
typedef enum {
GTK_CSS_SELECTOR_CATEGORY_SIMPLE,
GTK_CSS_SELECTOR_CATEGORY_SIMPLE_RADICAL,
GTK_CSS_SELECTOR_CATEGORY_PARENT,
GTK_CSS_SELECTOR_CATEGORY_SIBLING,
} GtkCssSelectorCategory;
typedef struct _GtkCssSelectorClass GtkCssSelectorClass;
struct _GtkCssSelectorClass {
const char *name;
GtkCssSelectorCategory category;
void (* print) (const GtkCssSelector *selector,
GString *string);
/* NULL or an iterator that returns the next node or %NULL if there are no
* more nodes.
* Call it like:
* for (iter = gtk_css_selector_iterator (node, NULL);
* iter;
* iter = gtk_css_selector_iterator (node, iter))
* {
* do_stuff();
* }
*/
GtkCssNode * (* iterator) (const GtkCssSelector *selector,
GtkCssNode *node,
GtkCssNode *current);
gboolean (* match_one) (const GtkCssSelector *selector,
GtkCssNode *node);
GtkCssChange (* get_change) (const GtkCssSelector *selector,
GtkCssChange previous_change);
void (* add_specificity) (const GtkCssSelector *selector,
guint *ids,
guint *classes,
guint *elements);
guint (* hash_one) (const GtkCssSelector *selector);
int (* compare_one) (const GtkCssSelector *a,
const GtkCssSelector *b);
};
typedef enum {
POSITION_FORWARD,
POSITION_BACKWARD,
POSITION_ONLY,
} PositionType;
#define POSITION_TYPE_BITS 4
#define POSITION_NUMBER_BITS ((sizeof (gpointer) * 8 - POSITION_TYPE_BITS) / 2)
union _GtkCssSelector
{
const GtkCssSelectorClass *class; /* type of check this selector does */
struct {
const GtkCssSelectorClass *class;
GQuark name;
} id;
struct {
const GtkCssSelectorClass *class;
GQuark style_class;
} style_class;
struct {
const GtkCssSelectorClass *class;
GQuark name;
} name;
struct {
const GtkCssSelectorClass *class;
GtkStateFlags state;
} state;
struct {
const GtkCssSelectorClass *class;
PositionType type :POSITION_TYPE_BITS;
gssize a :POSITION_NUMBER_BITS;
gssize b :POSITION_NUMBER_BITS;
} position;
};
#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->class->compare_one (a, b) == 0;
}
static guint
gtk_css_selector_hash_one (const GtkCssSelector *selector)
{
return selector->class->hash_one (selector);
}
static inline 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_matches_insert_sorted (GtkCssSelectorMatches *matches,
gpointer data)
{
guint i;
for (i = 0; i < gtk_css_selector_matches_get_size (matches); i++)
{
gpointer elem = gtk_css_selector_matches_get (matches, i);
if (data == elem)
return;
if (data < elem)
break;
}
gtk_css_selector_matches_splice (matches, i, 0, FALSE, (gpointer[1]) { data }, 1);
}
static inline gboolean
gtk_css_selector_match_one (const GtkCssSelector *selector,
GtkCssNode *node)
{
return selector->class->match_one (selector, node);
}
static inline GtkCssNode *
gtk_css_selector_iterator (const GtkCssSelector *selector,
GtkCssNode *node,
GtkCssNode *current)
{
return selector->class->iterator (selector, node, current);
}
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 inline 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 inline const GtkCssSelectorTree *
gtk_css_selector_tree_get_parent (const GtkCssSelectorTree *tree)
{
return gtk_css_selector_tree_at_offset (tree, tree->parent_offset);
}
static inline const GtkCssSelectorTree *
gtk_css_selector_tree_get_previous (const GtkCssSelectorTree *tree)
{
return gtk_css_selector_tree_at_offset (tree, tree->previous_offset);
}
static inline const GtkCssSelectorTree *
gtk_css_selector_tree_get_sibling (const GtkCssSelectorTree *tree)
{
return gtk_css_selector_tree_at_offset (tree, tree->sibling_offset);
}
/* DEFAULTS */
static void
gtk_css_selector_default_add_specificity (const GtkCssSelector *selector,
guint *ids,
guint *classes,
guint *elements)
{
/* no specificity changes */
}
static GtkCssNode *
gtk_css_selector_default_iterator (const GtkCssSelector *selector,
GtkCssNode *node,
GtkCssNode *current)
{
if (current)
return NULL;
else
return node;
}
static gboolean
gtk_css_selector_default_match_one (const GtkCssSelector *selector,
GtkCssNode *node)
{
return TRUE;
}
static guint
gtk_css_selector_default_hash_one (const GtkCssSelector *selector)
{
return GPOINTER_TO_UINT (selector->class);
}
static int
gtk_css_selector_default_compare_one (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return 0;
}
/* DESCENDANT */
static void
gtk_css_selector_descendant_print (const GtkCssSelector *selector,
GString *string)
{
g_string_append_c (string, ' ');
}
static GtkCssNode *
gtk_css_selector_descendant_iterator (const GtkCssSelector *selector,
GtkCssNode *node,
GtkCssNode *current)
{
return gtk_css_node_get_parent (current ? current : node);
}
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_CATEGORY_PARENT,
gtk_css_selector_descendant_print,
gtk_css_selector_descendant_iterator,
gtk_css_selector_default_match_one,
gtk_css_selector_descendant_get_change,
gtk_css_selector_default_add_specificity,
gtk_css_selector_default_hash_one,
gtk_css_selector_default_compare_one,
};
/* CHILD */
static void
gtk_css_selector_child_print (const GtkCssSelector *selector,
GString *string)
{
g_string_append (string, " > ");
}
static GtkCssNode *
gtk_css_selector_child_iterator (const GtkCssSelector *selector,
GtkCssNode *node,
GtkCssNode *current)
{
if (current == NULL)
return gtk_css_node_get_parent (node);
return NULL;
}
static GtkCssChange
gtk_css_selector_child_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
{
return _gtk_css_change_for_child (previous_change);
}
static const GtkCssSelectorClass GTK_CSS_SELECTOR_CHILD = {
"child",
GTK_CSS_SELECTOR_CATEGORY_PARENT,
gtk_css_selector_child_print,
gtk_css_selector_child_iterator,
gtk_css_selector_default_match_one,
gtk_css_selector_child_get_change,
gtk_css_selector_default_add_specificity,
gtk_css_selector_default_hash_one,
gtk_css_selector_default_compare_one,
};
/* SIBLING */
static void
gtk_css_selector_sibling_print (const GtkCssSelector *selector,
GString *string)
{
g_string_append (string, " ~ ");
}
static GtkCssNode *
get_previous_visible_sibling (GtkCssNode *node)
{
do {
node = gtk_css_node_get_previous_sibling (node);
} while (node && !gtk_css_node_get_visible (node));
return node;
}
static GtkCssNode *
get_next_visible_sibling (GtkCssNode *node)
{
do {
node = gtk_css_node_get_next_sibling (node);
} while (node && !gtk_css_node_get_visible (node));
return node;
}
static GtkCssNode *
gtk_css_selector_sibling_iterator (const GtkCssSelector *selector,
GtkCssNode *node,
GtkCssNode *current)
{
return get_previous_visible_sibling (current ? current : node);
}
static GtkCssChange
gtk_css_selector_sibling_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
{
return _gtk_css_change_for_sibling (previous_change);
}
static const GtkCssSelectorClass GTK_CSS_SELECTOR_SIBLING = {
"sibling",
GTK_CSS_SELECTOR_CATEGORY_SIBLING,
gtk_css_selector_sibling_print,
gtk_css_selector_sibling_iterator,
gtk_css_selector_default_match_one,
gtk_css_selector_sibling_get_change,
gtk_css_selector_default_add_specificity,
gtk_css_selector_default_hash_one,
gtk_css_selector_default_compare_one,
};
/* ADJACENT */
static void
gtk_css_selector_adjacent_print (const GtkCssSelector *selector,
GString *string)
{
g_string_append (string, " + ");
}
static GtkCssNode *
gtk_css_selector_adjacent_iterator (const GtkCssSelector *selector,
GtkCssNode *node,
GtkCssNode *current)
{
if (current == NULL)
return get_previous_visible_sibling (node);
return NULL;
}
static GtkCssChange
gtk_css_selector_adjacent_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
{
return _gtk_css_change_for_sibling (previous_change);
}
static const GtkCssSelectorClass GTK_CSS_SELECTOR_ADJACENT = {
"adjacent",
GTK_CSS_SELECTOR_CATEGORY_SIBLING,
gtk_css_selector_adjacent_print,
gtk_css_selector_adjacent_iterator,
gtk_css_selector_default_match_one,
gtk_css_selector_adjacent_get_change,
gtk_css_selector_default_add_specificity,
gtk_css_selector_default_hash_one,
gtk_css_selector_default_compare_one,
};
/* SIMPLE SELECTOR DEFINE */
#define DEFINE_SIMPLE_SELECTOR(n, \
c, \
print_func, \
match_func, \
hash_func, \
comp_func, \
increase_id_specificity, \
increase_class_specificity, \
increase_element_specificity, \
ignore_for_change) \
static void \
gtk_css_selector_ ## n ## _print (const GtkCssSelector *selector, \
GString *string) \
{ \
print_func (selector, string); \
} \
\
static void \
gtk_css_selector_not_ ## n ## _print (const GtkCssSelector *selector, \
GString *string) \
{ \
g_string_append (string, ":not("); \
print_func (selector, string); \
g_string_append (string, ")"); \
} \
\
static gboolean \
gtk_css_selector_not_ ## n ## _match_one (const GtkCssSelector *selector, \
GtkCssNode *node) \
{ \
return !match_func (selector, node); \
} \
\
static GtkCssChange \
gtk_css_selector_ ## n ## _get_change (const GtkCssSelector *selector, GtkCssChange previous_change) \
{ \
return previous_change | GTK_CSS_CHANGE_ ## c; \
} \
\
static void \
gtk_css_selector_ ## n ## _add_specificity (const GtkCssSelector *selector, \
guint *ids, \
guint *classes, \
guint *elements) \
{ \
if (increase_id_specificity) \
{ \
(*ids)++; \
} \
if (increase_class_specificity) \
{ \
(*classes)++; \
} \
if (increase_element_specificity) \
{ \
(*elements)++; \
} \
} \
\
static const GtkCssSelectorClass GTK_CSS_SELECTOR_ ## c = { \
G_STRINGIFY(n), \
ignore_for_change ? GTK_CSS_SELECTOR_CATEGORY_SIMPLE : GTK_CSS_SELECTOR_CATEGORY_SIMPLE_RADICAL, \
gtk_css_selector_ ## n ## _print, \
gtk_css_selector_default_iterator, \
match_func, \
gtk_css_selector_ ## n ## _get_change, \
gtk_css_selector_ ## n ## _add_specificity, \
hash_func, \
comp_func, \
};\
\
static const GtkCssSelectorClass GTK_CSS_SELECTOR_NOT_ ## c = { \
"not_" G_STRINGIFY(n), \
GTK_CSS_SELECTOR_CATEGORY_SIMPLE, \
gtk_css_selector_not_ ## n ## _print, \
gtk_css_selector_default_iterator, \
gtk_css_selector_not_ ## n ## _match_one, \
gtk_css_selector_ ## n ## _get_change, \
gtk_css_selector_ ## n ## _add_specificity, \
hash_func, \
comp_func, \
};
/* ANY */
static void
print_any (const GtkCssSelector *selector,
GString *string)
{
g_string_append_c (string, '*');
}
static gboolean
match_any (const GtkCssSelector *selector,
GtkCssNode *node)
{
return TRUE;
}
#undef GTK_CSS_CHANGE_ANY
#define GTK_CSS_CHANGE_ANY 0
DEFINE_SIMPLE_SELECTOR(any, ANY, print_any, match_any,
gtk_css_selector_default_hash_one, gtk_css_selector_default_compare_one,
FALSE, FALSE, FALSE, TRUE)
#undef GTK_CSS_CHANGE_ANY
/* NAME */
static void
print_name (const GtkCssSelector *selector,
GString *string)
{
g_string_append (string, g_quark_to_string (selector->name.name));
}
static gboolean
match_name (const GtkCssSelector *selector,
GtkCssNode *node)
{
return gtk_css_node_get_name (node) == selector->name.name;
}
static guint
hash_name (const GtkCssSelector *a)
{
return gtk_css_hash_name (a->name.name);
}
static int
comp_name (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return a->name.name - b->name.name;
}
DEFINE_SIMPLE_SELECTOR(name, NAME, print_name, match_name, hash_name, comp_name, FALSE, FALSE, TRUE, FALSE)
/* CLASS */
static void
print_class (const GtkCssSelector *selector,
GString *string)
{
g_string_append_c (string, '.');
g_string_append (string, g_quark_to_string (selector->style_class.style_class));
}
static gboolean
match_class (const GtkCssSelector *selector,
GtkCssNode *node)
{
return gtk_css_node_has_class (node, selector->style_class.style_class);
}
static guint
hash_class (const GtkCssSelector *a)
{
return gtk_css_hash_class (a->style_class.style_class);
}
static int
comp_class (const GtkCssSelector *a,
const GtkCssSelector *b)
{
if (a->style_class.style_class < b->style_class.style_class)
return -1;
if (a->style_class.style_class > b->style_class.style_class)
return 1;
else
return 0;
}
DEFINE_SIMPLE_SELECTOR(class, CLASS, print_class, match_class, hash_class, comp_class, FALSE, TRUE, FALSE, FALSE)
/* ID */
static void
print_id (const GtkCssSelector *selector,
GString *string)
{
g_string_append_c (string, '#');
g_string_append (string, g_quark_to_string (selector->id.name));
}
static gboolean
match_id (const GtkCssSelector *selector,
GtkCssNode *node)
{
return gtk_css_node_get_id (node) == selector->id.name;
}
static guint
hash_id (const GtkCssSelector *a)
{
return gtk_css_hash_id (a->id.name);
}
static int
comp_id (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return a->id.name - b->id.name;
}
DEFINE_SIMPLE_SELECTOR(id, ID, print_id, match_id, hash_id, comp_id, TRUE, FALSE, FALSE, FALSE)
/* PSEUDOCLASS FOR STATE */
static void
print_pseudoclass_state (const GtkCssSelector *selector,
GString *string)
{
g_string_append_c (string, ':');
g_string_append (string, gtk_css_pseudoclass_name (selector->state.state));
}
static gboolean
match_pseudoclass_state (const GtkCssSelector *selector,
GtkCssNode *node)
{
return (gtk_css_node_get_state (node) & selector->state.state) == selector->state.state;
}
static guint
hash_pseudoclass_state (const GtkCssSelector *selector)
{
return selector->state.state;
}
static int
comp_pseudoclass_state (const GtkCssSelector *a,
const GtkCssSelector *b)
{
return a->state.state - b->state.state;
}
static GtkCssChange
change_pseudoclass_state (const GtkCssSelector *selector)
{
GtkStateFlags states = selector->state.state;
GtkCssChange change = 0;
if (states & GTK_STATE_FLAG_PRELIGHT)
change |= GTK_CSS_CHANGE_HOVER;
if (states & GTK_STATE_FLAG_INSENSITIVE)
change |= GTK_CSS_CHANGE_DISABLED;
if (states & GTK_STATE_FLAG_BACKDROP)
change |= GTK_CSS_CHANGE_BACKDROP;
if (states & GTK_STATE_FLAG_SELECTED)
change |= GTK_CSS_CHANGE_SELECTED;
if (states & ~(GTK_STATE_FLAG_PRELIGHT |
GTK_STATE_FLAG_INSENSITIVE |
GTK_STATE_FLAG_BACKDROP |
GTK_STATE_FLAG_SELECTED))
change |= GTK_CSS_CHANGE_STATE;
return change;
}
#define GTK_CSS_CHANGE_PSEUDOCLASS_STATE change_pseudoclass_state (selector)
DEFINE_SIMPLE_SELECTOR(pseudoclass_state, PSEUDOCLASS_STATE, print_pseudoclass_state,
match_pseudoclass_state, hash_pseudoclass_state, comp_pseudoclass_state,
FALSE, TRUE, FALSE, TRUE)
#undef GTK_CSS_CHANGE_PSEUDOCLASS_STATE
/* PSEUDOCLASS FOR POSITION */
static void
print_pseudoclass_position (const GtkCssSelector *selector,
GString *string)
{
switch (selector->position.type)
{
case POSITION_FORWARD:
if (selector->position.a == 0)
{
if (selector->position.b == 1)
g_string_append (string, ":first-child");
else
g_string_append_printf (string, ":nth-child(%d)", selector->position.b);
}
else if (selector->position.a == 2 && selector->position.b == 0)
g_string_append (string, ":nth-child(even)");
else if (selector->position.a == 2 && selector->position.b == 1)
g_string_append (string, ":nth-child(odd)");
else
{
g_string_append (string, ":nth-child(");
if (selector->position.a == 1)
g_string_append (string, "n");
else if (selector->position.a == -1)
g_string_append (string, "-n");
else
g_string_append_printf (string, "%dn", selector->position.a);
if (selector->position.b > 0)
g_string_append_printf (string, "+%d)", selector->position.b);
else if (selector->position.b < 0)
g_string_append_printf (string, "%d)", selector->position.b);
else
g_string_append (string, ")");
}
break;
case POSITION_BACKWARD:
if (selector->position.a == 0)
{
if (selector->position.b == 1)
g_string_append (string, ":last-child");
else
g_string_append_printf (string, ":nth-last-child(%d)", selector->position.b);
}
else if (selector->position.a == 2 && selector->position.b == 0)
g_string_append (string, ":nth-last-child(even)");
else if (selector->position.a == 2 && selector->position.b == 1)
g_string_append (string, ":nth-last-child(odd)");
else
{
g_string_append (string, ":nth-last-child(");
if (selector->position.a == 1)
g_string_append (string, "n");
else if (selector->position.a == -1)
g_string_append (string, "-n");
else
g_string_append_printf (string, "%dn", selector->position.a);
if (selector->position.b > 0)
g_string_append_printf (string, "+%d)", selector->position.b);
else if (selector->position.b < 0)
g_string_append_printf (string, "%d)", selector->position.b);
else
g_string_append (string, ")");
}
break;
case POSITION_ONLY:
g_string_append (string, ":only-child");
break;
default:
g_assert_not_reached ();
break;
}
}
static gboolean
match_position (GtkCssNode *node,
GtkCssNode *(* prev_node_func) (GtkCssNode *),
int a,
int b)
{
int pos, x;
/* special-case the common "first-child" and "last-child" */
if (a == 0)
{
while (b > 0 && node != NULL)
{
b--;
node = prev_node_func (node);
}
return b == 0 && node == NULL;
}
/* count nodes */
for (pos = 0; node != NULL; pos++)
node = prev_node_func (node);
/* solve pos = a * X + b
* and return TRUE if X is integer >= 0 */
x = pos - b;
if (x % a)
return FALSE;
return x / a >= 0;
}
static gboolean
match_pseudoclass_position (const GtkCssSelector *selector,
GtkCssNode *node)
{
switch (selector->position.type)
{
case POSITION_FORWARD:
if (!match_position (node, get_previous_visible_sibling, selector->position.a, selector->position.b))
return FALSE;
break;
case POSITION_BACKWARD:
if (!match_position (node, get_next_visible_sibling, selector->position.a, selector->position.b))
return FALSE;
break;
case POSITION_ONLY:
if (get_previous_visible_sibling (node) ||
get_next_visible_sibling (node))
return FALSE;
break;
default:
g_assert_not_reached ();
return FALSE;
}
return TRUE;
}
static guint
hash_pseudoclass_position (const GtkCssSelector *a)
{
return (guint)(((((gulong)a->position.type) << POSITION_NUMBER_BITS) | a->position.a) << POSITION_NUMBER_BITS) | a->position.b;
}
static int
comp_pseudoclass_position (const GtkCssSelector *a,
const GtkCssSelector *b)
{
int diff;
diff = a->position.type - b->position.type;
if (diff)
return diff;
diff = a->position.a - b->position.a;
if (diff)
return diff;
return a->position.b - b->position.b;
}
static GtkCssChange
change_pseudoclass_position (const GtkCssSelector *selector)
{
switch (selector->position.type)
{
case POSITION_FORWARD:
if (selector->position.a == 0 && selector->position.b == 1)
return GTK_CSS_CHANGE_FIRST_CHILD;
else
return GTK_CSS_CHANGE_NTH_CHILD;
case POSITION_BACKWARD:
if (selector->position.a == 0 && selector->position.b == 1)
return GTK_CSS_CHANGE_LAST_CHILD;
else
return GTK_CSS_CHANGE_NTH_LAST_CHILD;
case POSITION_ONLY:
return GTK_CSS_CHANGE_FIRST_CHILD | GTK_CSS_CHANGE_LAST_CHILD;
default:
g_assert_not_reached ();
return 0;
}
}
#define GTK_CSS_CHANGE_PSEUDOCLASS_POSITION change_pseudoclass_position(selector)
DEFINE_SIMPLE_SELECTOR(pseudoclass_position, PSEUDOCLASS_POSITION, print_pseudoclass_position,
match_pseudoclass_position, hash_pseudoclass_position, comp_pseudoclass_position,
FALSE, TRUE, FALSE, TRUE)
#undef GTK_CSS_CHANGE_PSEUDOCLASS_POSITION
/* 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)
{
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));
memset (selector, 0, sizeof (GtkCssSelector));
selector->class = class;
return selector;
}
static GtkCssSelector *
gtk_css_selector_parse_selector_class (GtkCssParser *parser,
GtkCssSelector *selector,
gboolean negate)
{
const GtkCssToken *token;
gtk_css_parser_consume_token (parser);
for (token = gtk_css_parser_peek_token (parser);
gtk_css_token_is (token, GTK_CSS_TOKEN_COMMENT);
token = gtk_css_parser_peek_token (parser))
{
gtk_css_parser_consume_token (parser);
}
if (gtk_css_token_is (token, GTK_CSS_TOKEN_IDENT))
{
selector = gtk_css_selector_new (negate ? &GTK_CSS_SELECTOR_NOT_CLASS
: &GTK_CSS_SELECTOR_CLASS,
selector);
selector->style_class.style_class = g_quark_from_string (gtk_css_token_get_string (token));
gtk_css_parser_consume_token (parser);
return selector;
}
else
{
gtk_css_parser_error_syntax (parser, "No class name after '.' in selector");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
}
static gboolean
string_has_number (const char *string,
const char *prefix,
int *number)
{
gsize len = strlen (prefix);
char *end;
if (g_ascii_strncasecmp (string, prefix, len) != 0)
return FALSE;
errno = 0;
*number = strtoul (string + len, &end, 10);
if (*end != '\0' || errno != 0)
return FALSE;
return TRUE;
}
static gboolean
parse_plus_b (GtkCssParser *parser,
gboolean negate,
int *b)
{
const GtkCssToken *token;
gboolean has_seen_sign;
token = gtk_css_parser_get_token (parser);
if (negate)
{
has_seen_sign = TRUE;
}
else
{
if (gtk_css_token_is_delim (token, '+'))
{
gtk_css_parser_consume_token (parser);
has_seen_sign = TRUE;
}
else if (gtk_css_token_is_delim (token, '-'))
{
gtk_css_parser_consume_token (parser);
negate = TRUE;
has_seen_sign = TRUE;
}
else
{
has_seen_sign = FALSE;
}
}
token = gtk_css_parser_get_token (parser);
if (!has_seen_sign && gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNED_INTEGER))
{
*b = token->number.number;
gtk_css_parser_consume_token (parser);
return TRUE;
}
else if (has_seen_sign && gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNLESS_INTEGER))
{
*b = token->number.number;
if (negate)
*b = - *b;
gtk_css_parser_consume_token (parser);
return TRUE;
}
else if (!has_seen_sign)
{
*b = 0;
return TRUE;
}
gtk_css_parser_error_syntax (parser, "Not a valid an+b type");
return FALSE;
}
static gboolean
parse_n_plus_b (GtkCssParser *parser,
int before,
int *a,
int *b)
{
const GtkCssToken *token;
token = gtk_css_parser_get_token (parser);
if (gtk_css_token_is_ident (token, "n"))
{
*a = before;
gtk_css_parser_consume_token (parser);
return parse_plus_b (parser, FALSE, b);
}
else if (gtk_css_token_is_ident (token, "n-"))
{
*a = before;
gtk_css_parser_consume_token (parser);
return parse_plus_b (parser, TRUE, b);
}
else if (gtk_css_token_is (token, GTK_CSS_TOKEN_IDENT) &&
string_has_number (gtk_css_token_get_string (token), "n-", b))
{
*a = before;
*b = -*b;
gtk_css_parser_consume_token (parser);
return TRUE;
}
else
{
*b = before;
*a = 0;
return TRUE;
}
}
static gboolean
parse_a_n_plus_b (GtkCssParser *parser,
int seen_sign,
int *a,
int *b)
{
const GtkCssToken *token;
token = gtk_css_parser_get_token (parser);
if (!seen_sign && gtk_css_token_is_ident (token, "even"))
{
*a = 2;
*b = 0;
gtk_css_parser_consume_token (parser);
return TRUE;
}
else if (!seen_sign && gtk_css_token_is_ident (token, "odd"))
{
*a = 2;
*b = 1;
gtk_css_parser_consume_token (parser);
return TRUE;
}
else if (!seen_sign && gtk_css_token_is_delim (token, '+'))
{
gtk_css_parser_consume_token (parser);
return parse_a_n_plus_b (parser, 1, a, b);
}
else if (!seen_sign && gtk_css_token_is_delim (token, '-'))
{
gtk_css_parser_consume_token (parser);
return parse_a_n_plus_b (parser, -1, a, b);
}
else if ((!seen_sign && gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNED_INTEGER)) ||
gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNLESS_INTEGER))
{
int x = token->number.number * (seen_sign ? seen_sign : 1);
gtk_css_parser_consume_token (parser);
return parse_n_plus_b (parser, x , a, b);
}
else if (((!seen_sign && gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNED_INTEGER_DIMENSION)) ||
gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNLESS_INTEGER_DIMENSION)) &&
g_ascii_strcasecmp (token->dimension.dimension, "n") == 0)
{
*a = token->dimension.value * (seen_sign ? seen_sign : 1);
gtk_css_parser_consume_token (parser);
return parse_plus_b (parser, FALSE, b);
}
else if (((!seen_sign && gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNED_INTEGER_DIMENSION)) ||
gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNLESS_INTEGER_DIMENSION)) &&
g_ascii_strcasecmp (token->dimension.dimension, "n-") == 0)
{
*a = token->dimension.value * (seen_sign ? seen_sign : 1);
gtk_css_parser_consume_token (parser);
return parse_plus_b (parser, TRUE, b);
}
else if (((!seen_sign && gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNED_INTEGER_DIMENSION)) ||
gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNLESS_INTEGER_DIMENSION)) &&
string_has_number (token->dimension.dimension, "n-", b))
{
*a = token->dimension.value * (seen_sign ? seen_sign : 1);
*b = -*b;
gtk_css_parser_consume_token (parser);
return TRUE;
}
else if (!seen_sign && gtk_css_token_is_ident (token, "-n"))
{
*a = -1;
gtk_css_parser_consume_token (parser);
return parse_plus_b (parser, FALSE, b);
}
else if (!seen_sign && gtk_css_token_is_ident (token, "-n-"))
{
*a = -1;
gtk_css_parser_consume_token (parser);
return parse_plus_b (parser, TRUE, b);
}
else if (!seen_sign &&
gtk_css_token_is (token, GTK_CSS_TOKEN_IDENT) &&
string_has_number (gtk_css_token_get_string (token), "-n-", b))
{
*a = -1;
*b = -*b;
gtk_css_parser_consume_token (parser);
return TRUE;
}
else if (gtk_css_token_is_ident (token, "n") ||
gtk_css_token_is_ident (token, "n-"))
{
return parse_n_plus_b (parser, seen_sign ? seen_sign : 1, a, b);
}
else if (gtk_css_token_is (token, GTK_CSS_TOKEN_IDENT) &&
string_has_number (gtk_css_token_get_string (token), "n-", b))
{
*a = seen_sign ? seen_sign : 1;
*b = -*b;
gtk_css_parser_consume_token (parser);
return TRUE;
}
else if (!seen_sign && gtk_css_token_is (token, GTK_CSS_TOKEN_IDENT) &&
string_has_number (gtk_css_token_get_string (token), "-n-", b))
{
*a = -1;
*b = -*b;
gtk_css_parser_consume_token (parser);
return TRUE;
}
gtk_css_parser_error_syntax (parser, "Not a valid an+b type");
return FALSE;
}
static guint
parse_a_n_plus_b_arg (GtkCssParser *parser,
guint arg,
gpointer data)
{
int *ab = data;
if (!parse_a_n_plus_b (parser, FALSE, &ab[0], &ab[1]))
return 0;
return 1;
}
static guint
parse_dir_arg (GtkCssParser *parser,
guint arg,
gpointer data)
{
GtkStateFlags *flag = data;
if (gtk_css_parser_try_ident (parser, "ltr"))
{
*flag = GTK_STATE_FLAG_DIR_LTR;
return 1;
}
else if (gtk_css_parser_try_ident (parser, "rtl"))
{
*flag = GTK_STATE_FLAG_DIR_RTL;
return 1;
}
else
{
gtk_css_parser_error_value (parser, "Expected \"ltr\" or \"rtl\"");
return 0;
}
}
static guint
parse_identifier_arg (GtkCssParser *parser,
guint arg,
gpointer data)
{
const char *ident = data;
if (!gtk_css_parser_try_ident (parser, ident))
{
gtk_css_parser_error_value (parser, "Expected \"%s\"", ident);
return 0;
}
return 1;
}
static GtkCssSelector *
gtk_css_selector_parse_selector_pseudo_class (GtkCssParser *parser,
GtkCssSelector *selector,
gboolean negate)
{
GtkCssLocation start_location;
const GtkCssToken *token;
start_location = *gtk_css_parser_get_start_location (parser);
gtk_css_parser_consume_token (parser);
for (token = gtk_css_parser_peek_token (parser);
gtk_css_token_is (token, GTK_CSS_TOKEN_COMMENT);
token = gtk_css_parser_peek_token (parser))
{
gtk_css_parser_consume_token (parser);
}
if (gtk_css_token_is (token, GTK_CSS_TOKEN_IDENT))
{
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 },
{ "active", GTK_STATE_FLAG_ACTIVE, },
{ "hover", GTK_STATE_FLAG_PRELIGHT, },
{ "selected", GTK_STATE_FLAG_SELECTED, },
{ "disabled", GTK_STATE_FLAG_INSENSITIVE, },
{ "indeterminate", GTK_STATE_FLAG_INCONSISTENT, },
{ "focus", GTK_STATE_FLAG_FOCUSED, },
{ "backdrop", GTK_STATE_FLAG_BACKDROP, },
{ "link", GTK_STATE_FLAG_LINK, },
{ "visited", GTK_STATE_FLAG_VISITED, },
{ "checked", GTK_STATE_FLAG_CHECKED, },
{ "focus-visible", GTK_STATE_FLAG_FOCUS_VISIBLE, },
{ "focus-within", GTK_STATE_FLAG_FOCUS_WITHIN, },
};
guint i;
for (i = 0; i < G_N_ELEMENTS (pseudo_classes); i++)
{
if (g_ascii_strcasecmp (pseudo_classes[i].name, gtk_css_token_get_string (token)) == 0)
{
if (pseudo_classes[i].state_flag)
{
selector = gtk_css_selector_new (negate ? &GTK_CSS_SELECTOR_NOT_PSEUDOCLASS_STATE
: &GTK_CSS_SELECTOR_PSEUDOCLASS_STATE,
selector);
selector->state.state = pseudo_classes[i].state_flag;
}
else
{
selector = gtk_css_selector_new (negate ? &GTK_CSS_SELECTOR_NOT_PSEUDOCLASS_POSITION
: &GTK_CSS_SELECTOR_PSEUDOCLASS_POSITION,
selector);
selector->position.type = pseudo_classes[i].position_type;
selector->position.a = pseudo_classes[i].position_a;
selector->position.b = pseudo_classes[i].position_b;
}
gtk_css_parser_consume_token (parser);
return selector;
}
}
gtk_css_parser_error (parser,
GTK_CSS_PARSER_ERROR_UNKNOWN_VALUE,
&start_location,
gtk_css_parser_get_end_location (parser),
"Unknown name of pseudo-class");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
else if (gtk_css_token_is (token, GTK_CSS_TOKEN_FUNCTION))
{
if (gtk_css_token_is_function (token, "nth-child"))
{
int ab[2];
if (!gtk_css_parser_consume_function (parser, 1, 1, parse_a_n_plus_b_arg, ab))
{
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
selector = gtk_css_selector_new (negate ? &GTK_CSS_SELECTOR_NOT_PSEUDOCLASS_POSITION
: &GTK_CSS_SELECTOR_PSEUDOCLASS_POSITION,
selector);
selector->position.type = POSITION_FORWARD;
selector->position.a = ab[0];
selector->position.b = ab[1];
}
else if (gtk_css_token_is_function (token, "nth-last-child"))
{
int ab[2];
if (!gtk_css_parser_consume_function (parser, 1, 1, parse_a_n_plus_b_arg, ab))
{
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
selector = gtk_css_selector_new (negate ? &GTK_CSS_SELECTOR_NOT_PSEUDOCLASS_POSITION
: &GTK_CSS_SELECTOR_PSEUDOCLASS_POSITION,
selector);
selector->position.type = POSITION_BACKWARD;
selector->position.a = ab[0];
selector->position.b = ab[1];
}
else if (gtk_css_token_is_function (token, "not"))
{
if (negate)
{
gtk_css_parser_error_syntax (parser, "Nesting of :not() not allowed");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
else
{
gtk_css_parser_start_block (parser);
token = gtk_css_parser_get_token (parser);
if (gtk_css_token_is_delim (token, '*'))
{
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_NOT_ANY, selector);
gtk_css_parser_consume_token (parser);
}
else if (gtk_css_token_is (token, GTK_CSS_TOKEN_IDENT))
{
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_NOT_NAME, selector);
selector->name.name = g_quark_from_string (gtk_css_token_get_string (token));
gtk_css_parser_consume_token (parser);
}
else if (gtk_css_token_is (token, GTK_CSS_TOKEN_HASH_ID))
{
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_NOT_ID, selector);
selector->id.name = g_quark_from_string (gtk_css_token_get_string (token));
gtk_css_parser_consume_token (parser);
}
else if (gtk_css_token_is_delim (token, '.'))
{
selector = gtk_css_selector_parse_selector_class (parser, selector, TRUE);
}
else if (gtk_css_token_is (token, GTK_CSS_TOKEN_COLON))
{
selector = gtk_css_selector_parse_selector_pseudo_class (parser, selector, TRUE);
}
else
{
gtk_css_parser_error_syntax (parser, "Invalid contents of :not() selector");
gtk_css_parser_end_block (parser);
if (selector)
_gtk_css_selector_free (selector);
selector = NULL;
return NULL;
}
token = gtk_css_parser_get_token (parser);
if (!gtk_css_token_is (token, GTK_CSS_TOKEN_EOF))
{
gtk_css_parser_error_syntax (parser, "Invalid contents of :not() selector");
gtk_css_parser_end_block (parser);
if (selector)
_gtk_css_selector_free (selector);
selector = NULL;
return NULL;
}
gtk_css_parser_end_block (parser);
}
}
else if (gtk_css_token_is_function (token, "dir"))
{
GtkStateFlags flag;
if (!gtk_css_parser_consume_function (parser, 1, 1, parse_dir_arg, &flag))
{
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
selector = gtk_css_selector_new (negate ? &GTK_CSS_SELECTOR_NOT_PSEUDOCLASS_STATE
: &GTK_CSS_SELECTOR_PSEUDOCLASS_STATE,
selector);
selector->state.state = flag;
}
else if (gtk_css_token_is_function (token, "drop"))
{
if (!gtk_css_parser_consume_function (parser, 1, 1, parse_identifier_arg, (gpointer) "active"))
{
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
selector = gtk_css_selector_new (negate ? &GTK_CSS_SELECTOR_NOT_PSEUDOCLASS_STATE
: &GTK_CSS_SELECTOR_PSEUDOCLASS_STATE,
selector);
selector->state.state = GTK_STATE_FLAG_DROP_ACTIVE;
}
else
{
gtk_css_parser_error (parser,
GTK_CSS_PARSER_ERROR_UNKNOWN_VALUE,
&start_location,
gtk_css_parser_get_end_location (parser),
"Unknown pseudoclass");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
}
else
{
gtk_css_parser_error (parser,
GTK_CSS_PARSER_ERROR_UNKNOWN_VALUE,
&start_location,
gtk_css_parser_get_end_location (parser),
"Unknown pseudoclass");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
return selector;
}
static GtkCssSelector *
gtk_css_selector_parse_simple_selector (GtkCssParser *parser,
GtkCssSelector *selector)
{
gboolean parsed_something = FALSE;
const GtkCssToken *token;
do {
for (token = gtk_css_parser_peek_token (parser);
gtk_css_token_is (token, GTK_CSS_TOKEN_COMMENT);
token = gtk_css_parser_peek_token (parser))
{
gtk_css_parser_consume_token (parser);
}
if (!parsed_something && gtk_css_token_is_delim (token, '*'))
{
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_ANY, selector);
gtk_css_parser_consume_token (parser);
}
else if (!parsed_something && gtk_css_token_is (token, GTK_CSS_TOKEN_IDENT))
{
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_NAME, selector);
selector->name.name = g_quark_from_string (gtk_css_token_get_string (token));
gtk_css_parser_consume_token (parser);
}
else if (gtk_css_token_is (token, GTK_CSS_TOKEN_HASH_ID))
{
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_ID, selector);
selector->id.name = g_quark_from_string (gtk_css_token_get_string (token));
gtk_css_parser_consume_token (parser);
}
else if (gtk_css_token_is_delim (token, '.'))
{
selector = gtk_css_selector_parse_selector_class (parser, selector, FALSE);
}
else if (gtk_css_token_is (token, GTK_CSS_TOKEN_COLON))
{
selector = gtk_css_selector_parse_selector_pseudo_class (parser, selector, FALSE);
}
else
{
if (!parsed_something)
{
gtk_css_parser_error_syntax (parser, "Expected a valid selector");
if (selector)
_gtk_css_selector_free (selector);
selector = NULL;
}
break;
}
parsed_something = TRUE;
}
while (TRUE);
return selector;
}
GtkCssSelector *
_gtk_css_selector_parse (GtkCssParser *parser)
{
GtkCssSelector *selector = NULL;
const GtkCssToken *token;
while (TRUE)
{
gboolean seen_whitespace = FALSE;
/* skip all whitespace and comments */
gtk_css_parser_get_token (parser);
selector = gtk_css_selector_parse_simple_selector (parser, selector);
if (selector == NULL)
return NULL;
for (token = gtk_css_parser_peek_token (parser);
gtk_css_token_is (token, GTK_CSS_TOKEN_COMMENT) ||
gtk_css_token_is (token, GTK_CSS_TOKEN_WHITESPACE);
token = gtk_css_parser_peek_token (parser))
{
seen_whitespace |= gtk_css_token_is (token, GTK_CSS_TOKEN_WHITESPACE);
gtk_css_parser_consume_token (parser);
}
if (gtk_css_token_is_delim (token, '+'))
{
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_ADJACENT, selector);
gtk_css_parser_consume_token (parser);
}
else if (gtk_css_token_is_delim (token, '~'))
{
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_SIBLING, selector);
gtk_css_parser_consume_token (parser);
}
else if (gtk_css_token_is_delim (token, '>'))
{
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_CHILD, selector);
gtk_css_parser_consume_token (parser);
}
else if (gtk_css_token_is (token, GTK_CSS_TOKEN_EOF) ||
gtk_css_token_is (token, GTK_CSS_TOKEN_COMMA) ||
gtk_css_token_is (token, GTK_CSS_TOKEN_OPEN_CURLY))
{
break;
}
else if (seen_whitespace)
{
selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_DESCENDANT, selector);
}
else
{
gtk_css_parser_error_syntax (parser, "Expected a valid selector");
_gtk_css_selector_free (selector);
return 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);
}
/**
* gtk_css_selector_matches:
* @selector: the selector
* @node: The node to match
*
* Checks if the @selector matches the given @node.
*
* Returns: %TRUE if the selector matches @node
**/
gboolean
gtk_css_selector_matches (const GtkCssSelector *selector,
GtkCssNode *node)
{
GtkCssNode *child;
const GtkCssSelector *prev;
g_return_val_if_fail (selector != NULL, FALSE);
g_return_val_if_fail (node != NULL, FALSE);
if (!gtk_css_selector_match_one (selector, node))
return FALSE;
prev = gtk_css_selector_previous (selector);
if (prev == NULL)
return TRUE;
for (child = gtk_css_selector_iterator (selector, node, NULL);
child;
child = gtk_css_selector_iterator (selector, node, child))
{
if (gtk_css_selector_matches (prev, child))
return TRUE;
}
return FALSE;
}
/* 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))
{
selector->class->add_specificity (selector, ids, classes, 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;
}
GtkCssChange
_gtk_css_selector_get_change (const GtkCssSelector *selector)
{
if (selector == NULL)
return 0;
return selector->class->get_change (selector, _gtk_css_selector_get_change (gtk_css_selector_previous (selector)));
}
/******************** SelectorTree handling *****************/
static gboolean
gtk_css_selector_is_simple (const GtkCssSelector *selector)
{
switch (selector->class->category)
{
case GTK_CSS_SELECTOR_CATEGORY_SIMPLE:
case GTK_CSS_SELECTOR_CATEGORY_SIMPLE_RADICAL:
return TRUE;
case GTK_CSS_SELECTOR_CATEGORY_PARENT:
case GTK_CSS_SELECTOR_CATEGORY_SIBLING:
return FALSE;
default:
g_assert_not_reached ();
return FALSE;
}
}
static GHashTable *
gtk_css_selectors_count_initial_init (void)
{
return g_hash_table_new ((GHashFunc)gtk_css_selector_hash_one, (GEqualFunc)gtk_css_selector_equal);
}
static void
gtk_css_selectors_count_initial (const GtkCssSelector *selector, GHashTable *hash_one)
{
if (!gtk_css_selector_is_simple (selector))
{
guint count = GPOINTER_TO_INT (g_hash_table_lookup (hash_one, selector));
g_hash_table_replace (hash_one, (gpointer)selector, GUINT_TO_POINTER (count + 1));
return;
}
for (;
selector && gtk_css_selector_is_simple (selector);
selector = gtk_css_selector_previous (selector))
{
guint count = GPOINTER_TO_INT (g_hash_table_lookup (hash_one, selector));
g_hash_table_replace (hash_one, (gpointer)selector, GUINT_TO_POINTER (count + 1));
}
}
static gboolean
gtk_css_selectors_has_initial_selector (const GtkCssSelector *selector, const GtkCssSelector *initial)
{
if (!gtk_css_selector_is_simple (selector))
return gtk_css_selector_equal (selector, initial);
for (;
selector && gtk_css_selector_is_simple (selector);
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 && gtk_css_selector_is_simple (found); found = (GtkCssSelector *)gtk_css_selector_previous (found))
{
if (gtk_css_selector_equal (found, initial))
break;
}
g_assert (found != NULL && gtk_css_selector_is_simple (found));
tmp = *found;
*found = *selector;
*selector = tmp;
}
return (GtkCssSelector *)gtk_css_selector_previous (selector);
}
/* 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 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
/* The code for collecting matches assumes that the name, id and classes
* of a node remain unchanged, and anything else can change. This needs to
* be kept in sync with the definition of 'radical change' in gtkcssnode.c.
*/
static GtkCssChange
gtk_css_selector_tree_get_change (const GtkCssSelectorTree *tree,
const GtkCountingBloomFilter *filter,
GtkCssNode *node,
gboolean skipping)
{
GtkCssChange change = 0;
const GtkCssSelectorTree *prev;
switch (tree->selector.class->category)
{
case GTK_CSS_SELECTOR_CATEGORY_SIMPLE:
break;
case GTK_CSS_SELECTOR_CATEGORY_SIMPLE_RADICAL:
if (skipping)
break;
if (node)
{
if (!tree->selector.class->match_one (&tree->selector, node))
return 0;
}
else if (filter)
{
if (!gtk_counting_bloom_filter_may_contain (filter,
gtk_css_selector_hash_one (&tree->selector)))
return 0;
}
break;
case GTK_CSS_SELECTOR_CATEGORY_PARENT:
skipping = FALSE;
node = NULL;
break;
case GTK_CSS_SELECTOR_CATEGORY_SIBLING:
skipping = TRUE;
node = NULL;
break;
default:
g_assert_not_reached ();
return 0;
}
for (prev = gtk_css_selector_tree_get_previous (tree);
prev != NULL;
prev = gtk_css_selector_tree_get_sibling (prev))
change |= gtk_css_selector_tree_get_change (prev, filter, node, skipping);
if (change || gtk_css_selector_tree_get_matches (tree))
change = tree->selector.class->get_change (&tree->selector, change & ~GTK_CSS_CHANGE_GOT_MATCH) | GTK_CSS_CHANGE_GOT_MATCH;
return change;
}
static void
gtk_css_selector_tree_found_match (const GtkCssSelectorTree *tree,
GtkCssSelectorMatches *results)
{
int i;
gpointer *matches;
matches = gtk_css_selector_tree_get_matches (tree);
if (!matches)
return;
for (i = 0; matches[i] != NULL; i++)
gtk_css_selector_matches_insert_sorted (results, matches[i]);
}
static gboolean
gtk_css_selector_tree_match (const GtkCssSelectorTree *tree,
const GtkCountingBloomFilter *filter,
gboolean match_filter,
GtkCssNode *node,
GtkCssSelectorMatches *results)
{
const GtkCssSelectorTree *prev;
GtkCssNode *child;
if (match_filter && tree->selector.class->category == GTK_CSS_SELECTOR_CATEGORY_SIMPLE_RADICAL &&
!gtk_counting_bloom_filter_may_contain (filter, gtk_css_selector_hash_one (&tree->selector)))
return FALSE;
if (!gtk_css_selector_match_one (&tree->selector, node))
return TRUE;
gtk_css_selector_tree_found_match (tree, results);
if (filter && !gtk_css_selector_is_simple (&tree->selector))
match_filter = tree->selector.class->category == GTK_CSS_SELECTOR_CATEGORY_PARENT;
for (prev = gtk_css_selector_tree_get_previous (tree);
prev != NULL;
prev = gtk_css_selector_tree_get_sibling (prev))
{
for (child = gtk_css_selector_iterator (&tree->selector, node, NULL);
child;
child = gtk_css_selector_iterator (&tree->selector, node, child))
{
if (!gtk_css_selector_tree_match (prev, filter, match_filter, child, results))
break;
}
}
return TRUE;
}
void
_gtk_css_selector_tree_match_all (const GtkCssSelectorTree *tree,
const GtkCountingBloomFilter *filter,
GtkCssNode *node,
GtkCssSelectorMatches *out_tree_rules)
{
const GtkCssSelectorTree *iter;
for (iter = tree;
iter != NULL;
iter = gtk_css_selector_tree_get_sibling (iter))
{
gtk_css_selector_tree_match (iter, filter, FALSE, node, out_tree_rules);
}
}
gboolean
_gtk_css_selector_tree_is_empty (const GtkCssSelectorTree *tree)
{
return tree == NULL;
}
GtkCssChange
gtk_css_selector_tree_get_change_all (const GtkCssSelectorTree *tree,
const GtkCountingBloomFilter *filter,
GtkCssNode *node)
{
GtkCssChange change = 0;
for (; tree != NULL;
tree = gtk_css_selector_tree_get_sibling (tree))
change |= gtk_css_selector_tree_get_change (tree, filter, node, FALSE);
/* Never return reserved bit set */
return change & ~GTK_CSS_CHANGE_RESERVED_BIT;
}
#ifdef PRINT_TREE
static void
_gtk_css_selector_tree_print (const GtkCssSelectorTree *tree, GString *str, const char *prefix)
{
gboolean first = TRUE;
int len, i;
gpointer *matches;
for (; tree != NULL; tree = gtk_css_selector_tree_get_sibling (tree), first = FALSE)
{
if (!first)
g_string_append (str, prefix);
if (first)
{
if (gtk_css_selector_tree_get_sibling (tree))
g_string_append (str, "─┬─");
else
g_string_append (str, "───");
}
else
{
if (gtk_css_selector_tree_get_sibling (tree))
g_string_append (str, " ├─");
else
g_string_append (str, " └─");
}
len = str->len;
tree->selector.class->print (&tree->selector, str);
matches = gtk_css_selector_tree_get_matches (tree);
if (matches)
{
int n;
for (n = 0; matches[n] != NULL; n++) ;
if (n == 1)
g_string_append (str, " (1 match)");
else
g_string_append_printf (str, " (%d matches)", n);
}
len = str->len - len;
if (gtk_css_selector_tree_get_previous (tree))
{
GString *prefix2 = g_string_new (prefix);
if (gtk_css_selector_tree_get_sibling (tree))
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 *iter;
g_return_if_fail (tree != NULL);
/* print name and * selector before others */
for (iter = tree;
iter && gtk_css_selector_is_simple (&iter->selector);
iter = gtk_css_selector_tree_get_parent (iter))
{
if (iter->selector.class == &GTK_CSS_SELECTOR_NAME ||
iter->selector.class == &GTK_CSS_SELECTOR_ANY)
{
iter->selector.class->print (&iter->selector, str);
}
}
/* now print other simple selectors */
for (iter = tree;
iter && gtk_css_selector_is_simple (&iter->selector);
iter = gtk_css_selector_tree_get_parent (iter))
{
if (iter->selector.class != &GTK_CSS_SELECTOR_NAME &&
iter->selector.class != &GTK_CSS_SELECTOR_ANY)
{
iter->selector.class->print (&iter->selector, str);
}
}
/* now if there's a combinator, print that one */
if (iter != NULL)
{
iter->selector.class->print (&iter->selector, str);
tree = gtk_css_selector_tree_get_parent (iter);
if (tree)
_gtk_css_selector_tree_match_print (tree, 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,
GtkCssSelectorRuleSetInfo **infos,
guint n_infos,
gint32 parent_offset)
{
GtkCssSelectorRuleSetInfo **matched_infos;
guint n_matched = 0;
GtkCssSelectorRuleSetInfo **remaining_infos;
guint n_remaining = 0;
GHashTable *ht;
gint32 tree_offset;
GtkCssSelectorTree *tree;
GtkCssSelector max_selector;
GHashTableIter iter;
guint max_count;
gpointer key, value;
GtkCssSelectorMatches exact_matches;
gint32 res;
guint i;
if (n_infos == 0)
return GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET;
ht = gtk_css_selectors_count_initial_init ();
for (i = 0; i < n_infos; i++)
{
const GtkCssSelectorRuleSetInfo *info = infos[i];
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;
}
}
tree = alloc_tree (array, &tree_offset);
tree->parent_offset = parent_offset;
tree->selector = max_selector;
/* Allocate maximum for both of them */
/* TODO: Potentially dangerous? */
matched_infos = g_alloca (sizeof (GtkCssSelectorRuleSetInfo *) * n_infos);
remaining_infos = g_alloca (sizeof (GtkCssSelectorRuleSetInfo *) * n_infos);
gtk_css_selector_matches_init (&exact_matches);
for (i = 0; i < n_infos; i++)
{
GtkCssSelectorRuleSetInfo *info = infos[i];
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 */
gtk_css_selector_matches_append (&exact_matches, info->match);
if (info->selector_match != NULL)
*info->selector_match = GUINT_TO_POINTER (tree_offset);
}
else
{
matched_infos[n_matched] = info;
n_matched++;
}
}
else
{
remaining_infos[n_remaining] = info;
n_remaining++;
}
}
if (!gtk_css_selector_matches_is_empty (&exact_matches))
{
gtk_css_selector_matches_append (&exact_matches, NULL); /* Null terminate */
res = array->len;
g_byte_array_append (array, (guint8 *) gtk_css_selector_matches_get_data (&exact_matches),
gtk_css_selector_matches_get_size (&exact_matches) * sizeof (gpointer));
}
else
res = GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET;
gtk_css_selector_matches_clear (&exact_matches);
get_tree (array, tree_offset)->matches_offset = res;
res = subdivide_infos (array, matched_infos, n_matched, tree_offset);
get_tree (array, tree_offset)->previous_offset = res;
res = subdivide_infos (array, remaining_infos, n_remaining, parent_offset);
get_tree (array, tree_offset)->sibling_offset = res;
g_hash_table_unref (ht);
return tree_offset;
}
struct _GtkCssSelectorTreeBuilder {
GArray *infos;
};
GtkCssSelectorTreeBuilder *
_gtk_css_selector_tree_builder_new (void)
{
GtkCssSelectorTreeBuilder *builder = g_new0 (GtkCssSelectorTreeBuilder, 1);
builder->infos = g_array_new (FALSE, TRUE, sizeof (GtkCssSelectorRuleSetInfo));
return builder;
}
void
_gtk_css_selector_tree_builder_free (GtkCssSelectorTreeBuilder *builder)
{
g_array_free (builder->infos, TRUE);
g_free (builder);
}
void
_gtk_css_selector_tree_builder_add (GtkCssSelectorTreeBuilder *builder,
GtkCssSelector *selectors,
GtkCssSelectorTree **selector_match,
gpointer match)
{
GtkCssSelectorRuleSetInfo *info;
g_array_set_size (builder->infos, builder->infos->len + 1);
info = &g_array_index (builder->infos, GtkCssSelectorRuleSetInfo, builder->infos->len - 1);
info->match = match;
info->current_selector = selectors;
info->selector_match = selector_match;
}
/* 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;
guint i;
GtkCssSelectorRuleSetInfo **infos_array;
array = g_byte_array_new ();
infos_array = g_alloca (sizeof (GtkCssSelectorRuleSetInfo *) * builder->infos->len);
for (i = 0; i < builder->infos->len; i++)
infos_array[i] = &g_array_index (builder->infos, GtkCssSelectorRuleSetInfo, i);
subdivide_infos (array, infos_array, builder->infos->len, 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 (i = 0; i < builder->infos->len; i++)
{
GtkCssSelectorRuleSetInfo *info = &g_array_index (builder->infos, GtkCssSelectorRuleSetInfo, i);
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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