[gtk+/wip/css: 12/17] selector: Rewrite position tracking
- From: Benjamin Otte <otte src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk+/wip/css: 12/17] selector: Rewrite position tracking
- Date: Sun, 18 Mar 2012 15:26:32 +0000 (UTC)
commit 05ba1eefa17a040c4474d70430386dd41a7e0fe6
Author: Benjamin Otte <otte redhat com>
Date: Sun Mar 18 02:11:44 2012 +0100
selector: Rewrite position tracking
We now track the position as a (type,a,b) tuple where the numbers make
up the an + b formula from CSS3 nth-child.
Also, the get_sibling() and get_sibling_index() vfuncs were replaced by
a has_position() vfunc. This is mostly so that the matcher can always
return TRUE. And I need that for the everything matcher.
gtk/gtkcssmatcher.c | 34 +++--
gtk/gtkcssmatcherprivate.h | 19 +-
gtk/gtkcssselector.c | 437 +++++++++++++++++++++++++++++++-------------
3 files changed, 337 insertions(+), 153 deletions(-)
---
diff --git a/gtk/gtkcssmatcher.c b/gtk/gtkcssmatcher.c
index 053280f..cf9489e 100644
--- a/gtk/gtkcssmatcher.c
+++ b/gtk/gtkcssmatcher.c
@@ -146,22 +146,33 @@ gtk_css_matcher_widget_path_has_region (const GtkCssMatcher *matcher,
return TRUE;
}
-static guint
-gtk_css_matcher_widget_path_get_sibling_index (const GtkCssMatcher *matcher)
-{
- return matcher->path.sibling_index;
-}
-
-static guint
-gtk_css_matcher_widget_path_get_n_siblings (const GtkCssMatcher *matcher)
+static gboolean
+gtk_css_matcher_widget_path_has_position (const GtkCssMatcher *matcher,
+ gboolean forward,
+ int a,
+ int b)
{
const GtkWidgetPath *siblings;
+ int x;
siblings = gtk_widget_path_iter_get_siblings (matcher->path.path, matcher->path.index);
if (!siblings)
- return 0;
+ return FALSE;
+
+ if (forward)
+ x = matcher->path.sibling_index + 1;
+ else
+ x = gtk_widget_path_length (siblings) - matcher->path.sibling_index;
+
+ x -= b;
+
+ if (a == 0)
+ return x == 0;
+
+ if (x % a)
+ return FALSE;
- return gtk_widget_path_length (siblings);
+ return x / a > 0;
}
static const GtkCssMatcherClass GTK_CSS_MATCHER_WIDGET_PATH = {
@@ -173,8 +184,7 @@ static const GtkCssMatcherClass GTK_CSS_MATCHER_WIDGET_PATH = {
gtk_css_matcher_widget_path_has_id,
gtk_css_matcher_widget_path_has_regions,
gtk_css_matcher_widget_path_has_region,
- gtk_css_matcher_widget_path_get_sibling_index,
- gtk_css_matcher_widget_path_get_n_siblings
+ gtk_css_matcher_widget_path_has_position,
};
void
diff --git a/gtk/gtkcssmatcherprivate.h b/gtk/gtkcssmatcherprivate.h
index 50412f4..387c525 100644
--- a/gtk/gtkcssmatcherprivate.h
+++ b/gtk/gtkcssmatcherprivate.h
@@ -44,8 +44,10 @@ struct _GtkCssMatcherClass {
gboolean (* has_region) (const GtkCssMatcher *matcher,
const char *region,
GtkRegionFlags flags);
- guint (* get_sibling_index) (const GtkCssMatcher *matcher);
- guint (* get_n_siblings) (const GtkCssMatcher *matcher);
+ gboolean (* has_position) (const GtkCssMatcher *matcher,
+ gboolean forward,
+ int a,
+ int b);
};
struct _GtkCssMatcherWidgetPath {
@@ -122,15 +124,12 @@ _gtk_css_matcher_has_region (const GtkCssMatcher *matcher,
}
static inline guint
-_gtk_css_matcher_get_sibling_index (const GtkCssMatcher *matcher)
+_gtk_css_matcher_has_position (const GtkCssMatcher *matcher,
+ gboolean forward,
+ int a,
+ int b)
{
- return matcher->klass->get_sibling_index (matcher);
-}
-
-static inline guint
-_gtk_css_matcher_get_n_siblings (const GtkCssMatcher *matcher)
-{
- return matcher->klass->get_n_siblings (matcher);
+ return matcher->klass->has_position (matcher, forward, a, b);
}
diff --git a/gtk/gtkcssselector.c b/gtk/gtkcssselector.c
index 8c3c4da..22b9585 100644
--- a/gtk/gtkcssselector.c
+++ b/gtk/gtkcssselector.c
@@ -472,33 +472,140 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_PSEUDOCLASS_STATE = {
/* 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)
{
- static const char * flag_names[] = {
- "nth-child(even)",
- "nth-child(odd)",
- "first-child",
- "last-child",
- "only-child",
- "sorted"
- };
- guint i, state;
-
- state = GPOINTER_TO_UINT (selector->data);
- g_string_append_c (string, ':');
+ PositionType type;
+ int a, b;
- for (i = 0; i < G_N_ELEMENTS (flag_names); i++)
+ decode_position (selector, &type, &a, &b);
+ switch (type)
{
- if (state == (1 << i))
+ case POSITION_FORWARD:
+ if (a == 0)
{
- g_string_append (string, flag_names[i]);
- return;
+ 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;
}
-
- g_assert_not_reached ();
}
static gboolean
@@ -507,8 +614,38 @@ gtk_css_selector_pseudoclass_position_match_for_region (const GtkCssSelector *se
{
GtkRegionFlags selector_flags;
const GtkCssSelector *previous;
-
- selector_flags = GPOINTER_TO_UINT (selector->data);
+ 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;
+ }
selector = gtk_css_selector_previous (selector);
if (!_gtk_css_matcher_has_region (matcher, selector->data, selector_flags))
@@ -526,44 +663,31 @@ static gboolean
gtk_css_selector_pseudoclass_position_match (const GtkCssSelector *selector,
const GtkCssMatcher *matcher)
{
- GtkRegionFlags region;
- guint sibling, n_siblings;
const GtkCssSelector *previous;
+ PositionType type;
+ int a, b;
previous = gtk_css_selector_previous (selector);
if (previous && previous->class == >K_CSS_SELECTOR_REGION)
return gtk_css_selector_pseudoclass_position_match_for_region (selector, matcher);
- n_siblings = _gtk_css_matcher_get_n_siblings (matcher);
- if (n_siblings == 0)
- return FALSE;
- sibling = _gtk_css_matcher_get_sibling_index (matcher);
-
- region = GPOINTER_TO_UINT (selector->data);
-
- switch (region)
+ decode_position (selector, &type, &a, &b);
+ switch (type)
{
- case GTK_REGION_EVEN:
- if (!(sibling % 2))
- return FALSE;
- break;
- case GTK_REGION_ODD:
- if (sibling % 2)
- return FALSE;
- break;
- case GTK_REGION_FIRST:
- if (sibling != 0)
+ case POSITION_FORWARD:
+ if (!_gtk_css_matcher_has_position (matcher, TRUE, a, b))
return FALSE;
break;
- case GTK_REGION_LAST:
- if (sibling + 1 != n_siblings)
+ case POSITION_BACKWARD:
+ if (!_gtk_css_matcher_has_position (matcher, FALSE, a, b))
return FALSE;
break;
- case GTK_REGION_ONLY:
- if (n_siblings != 1)
+ 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 GTK_REGION_SORTED:
+ case POSITION_SORTED:
return FALSE;
default:
g_assert_not_reached ();
@@ -672,125 +796,176 @@ parse_selector_id (GtkCssParser *parser, GtkCssSelector *selector)
}
static GtkCssSelector *
-parse_selector_pseudo_class (GtkCssParser *parser,
- GtkCssSelector *selector)
+parse_selector_pseudo_class_nth_child (GtkCssParser *parser,
+ GtkCssSelector *selector,
+ PositionType type)
{
- struct {
- const char *name;
- GtkRegionFlags region_flag;
- GtkStateFlags state_flag;
- } pseudo_classes[] = {
- { "first-child", GTK_REGION_FIRST, 0 },
- { "last-child", GTK_REGION_LAST, 0 },
- { "only-child", GTK_REGION_ONLY, 0 },
- { "sorted", GTK_REGION_SORTED, 0 },
- { "active", 0, GTK_STATE_FLAG_ACTIVE },
- { "prelight", 0, GTK_STATE_FLAG_PRELIGHT },
- { "hover", 0, GTK_STATE_FLAG_PRELIGHT },
- { "selected", 0, GTK_STATE_FLAG_SELECTED },
- { "insensitive", 0, GTK_STATE_FLAG_INSENSITIVE },
- { "inconsistent", 0, GTK_STATE_FLAG_INCONSISTENT },
- { "focused", 0, GTK_STATE_FLAG_FOCUSED },
- { "focus", 0, GTK_STATE_FLAG_FOCUSED },
- { "backdrop", 0, GTK_STATE_FLAG_BACKDROP },
- { NULL, }
- }, nth_child_classes[] = {
- { "first", GTK_REGION_FIRST, 0 },
- { "last", GTK_REGION_LAST, 0 },
- { "even", GTK_REGION_EVEN, 0 },
- { "odd", GTK_REGION_ODD, 0 },
- { NULL, }
- }, *classes;
- guint i;
- char *name;
- GError *error;
+ int a, b;
- name = _gtk_css_parser_try_ident (parser, FALSE);
- if (name == NULL)
+ if (!_gtk_css_parser_try (parser, "(", TRUE))
{
- _gtk_css_parser_error (parser, "Missing name of pseudo-class");
+ _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, "(", TRUE))
+ 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))
{
- char *function = name;
+ 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;
- name = _gtk_css_parser_try_ident (parser, TRUE);
- if (!_gtk_css_parser_try (parser, ")", FALSE))
+ 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"))
{
- _gtk_css_parser_error (parser, "Missing closing bracket for pseudo-class");
+ a = multiplier;
+ }
+ else
+ {
+ _gtk_css_parser_error (parser, "Expected an integer");
if (selector)
_gtk_css_selector_free (selector);
return NULL;
}
- if (g_ascii_strcasecmp (function, "nth-child") != 0)
+ if (_gtk_css_parser_try (parser, "n", TRUE))
{
- error = g_error_new (GTK_CSS_PROVIDER_ERROR,
- GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
- "Unknown pseudo-class '%s(%s)'", function, name ? name : "");
- _gtk_css_parser_take_error (parser, error);
- g_free (function);
- g_free (name);
- if (selector)
- _gtk_css_selector_free (selector);
- return NULL;
+ 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;
}
-
- g_free (function);
-
- if (name == NULL)
+ else
{
- error = g_error_new (GTK_CSS_PROVIDER_ERROR,
- GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
- "Unknown pseudo-class 'nth-child(%s)'", name);
- _gtk_css_parser_take_error (parser, error);
- if (selector)
- _gtk_css_selector_free (selector);
- return NULL;
+ b = a;
+ a = 0;
}
+ }
- classes = nth_child_classes;
+ 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;
}
- else
- classes = pseudo_classes;
- for (i = 0; classes[i].name != NULL; i++)
+ selector = gtk_css_selector_new (>K_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 (g_ascii_strcasecmp (name, classes[i].name) == 0)
+ if (_gtk_css_parser_try (parser, pseudo_classes[i].name, FALSE))
{
- g_free (name);
-
- if (classes[i].region_flag)
- selector = gtk_css_selector_new (>K_CSS_SELECTOR_PSEUDOCLASS_POSITION,
+ if (pseudo_classes[i].state_flag)
+ selector = gtk_css_selector_new (>K_CSS_SELECTOR_PSEUDOCLASS_STATE,
selector,
- GUINT_TO_POINTER (classes[i].region_flag));
+ GUINT_TO_POINTER (pseudo_classes[i].state_flag));
else
- selector = gtk_css_selector_new (>K_CSS_SELECTOR_PSEUDOCLASS_STATE,
+ selector = gtk_css_selector_new (>K_CSS_SELECTOR_PSEUDOCLASS_POSITION,
selector,
- GUINT_TO_POINTER (classes[i].state_flag));
-
+ encode_position (pseudo_classes[i].position_type,
+ pseudo_classes[i].position_a,
+ pseudo_classes[i].position_b));
return selector;
}
}
-
- if (classes == nth_child_classes)
- error = g_error_new (GTK_CSS_PROVIDER_ERROR,
- GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
- "Unknown pseudo-class 'nth-child(%s)'", name);
- else
- error = g_error_new (GTK_CSS_PROVIDER_ERROR,
- GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
- "Unknown pseudo-class '%s'", name);
-
- _gtk_css_parser_take_error (parser, error);
- g_free (name);
+
+ _gtk_css_parser_error (parser, "Missing name of pseudo-class");
if (selector)
_gtk_css_selector_free (selector);
-
return NULL;
}
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