gnome-shell/src/st/st-theme.c
Dan Winship e4c7f1f3c4 St: require libcroco >= 0.6.2
and remove the workaround for the parsing bug in earlier versions

https://bugzilla.gnome.org/show_bug.cgi?id=648760
2011-04-27 15:29:24 -04:00

1039 lines
31 KiB
C

/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* st-theme.c: A set of CSS stylesheets used for rule matching
*
* Copyright 2003-2004 Dodji Seketeli
* Copyright 2008, 2009 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU Lesser General Public License,
* version 2.1, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 program. If not, see <http://www.gnu.org/licenses/>.
*
* This file started as a cut-and-paste of cr-sel-eng.c from libcroco.
*
* In moving it to hippo-canvas:
* - Reformatted and otherwise edited to match our coding style
* - Switched from handling xmlNode to handling HippoStyle
* - Simplified by removing things that we don't need or that don't
* make sense in our context.
* - The code to get a list of matching properties works quite differently;
* we order things in priority order, but we don't actually try to
* coalesce properties with the same name.
*
* In moving it to GNOME Shell:
* - Renamed again to StTheme
* - Reformatted to match the gnome-shell coding style
* - Removed notion of "theme engine" from hippo-canvas
* - pseudo-class matching changed from link enum to strings
* - Some code simplification
*/
#include <stdlib.h>
#include <string.h>
#include <gio/gio.h>
#include "st-theme-node.h"
#include "st-theme-private.h"
static GObject *st_theme_constructor (GType type,
guint n_construct_properties,
GObjectConstructParam *construct_properties);
static void st_theme_finalize (GObject *object);
static void st_theme_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void st_theme_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
struct _StTheme
{
GObject parent;
char *application_stylesheet;
char *default_stylesheet;
char *theme_stylesheet;
GSList *custom_stylesheets;
GHashTable *stylesheets_by_filename;
GHashTable *filenames_by_stylesheet;
CRCascade *cascade;
};
struct _StThemeClass
{
GObjectClass parent_class;
};
enum
{
PROP_0,
PROP_APPLICATION_STYLESHEET,
PROP_THEME_STYLESHEET,
PROP_DEFAULT_STYLESHEET
};
G_DEFINE_TYPE (StTheme, st_theme, G_TYPE_OBJECT)
/* Quick strcmp. Test only for == 0 or != 0, not < 0 or > 0. */
#define strqcmp(str,lit,lit_len) \
(strlen (str) != (lit_len) || memcmp (str, lit, lit_len))
static void
st_theme_init (StTheme *theme)
{
theme->stylesheets_by_filename = g_hash_table_new_full (g_str_hash, g_str_equal,
(GDestroyNotify)g_free, (GDestroyNotify)cr_stylesheet_unref);
theme->filenames_by_stylesheet = g_hash_table_new (g_direct_hash, g_direct_equal);
}
static void
st_theme_class_init (StThemeClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->constructor = st_theme_constructor;
object_class->finalize = st_theme_finalize;
object_class->set_property = st_theme_set_property;
object_class->get_property = st_theme_get_property;
/**
* StTheme:application-stylesheet:
*
* The highest priority stylesheet, representing application-specific
* styling; this is associated with the CSS "author" stylesheet.
*/
g_object_class_install_property (object_class,
PROP_APPLICATION_STYLESHEET,
g_param_spec_string ("application-stylesheet",
"Application Stylesheet",
"Stylesheet with application-specific styling",
NULL,
G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
/**
* StTheme:theme-stylesheet:
*
* The second priority stylesheet, representing theme-specific styling;
* this is associated with the CSS "user" stylesheet.
*/
g_object_class_install_property (object_class,
PROP_THEME_STYLESHEET,
g_param_spec_string ("theme-stylesheet",
"Theme Stylesheet",
"Stylesheet with theme-specific styling",
NULL,
G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
/**
* StTheme:default-stylesheet:
*
* The lowest priority stylesheet, representing global default
* styling; this is associated with the CSS "user agent" stylesheet.
*/
g_object_class_install_property (object_class,
PROP_DEFAULT_STYLESHEET,
g_param_spec_string ("default-stylesheet",
"Default Stylesheet",
"Stylesheet with global default styling",
NULL,
G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
}
static CRStyleSheet *
parse_stylesheet (const char *filename,
GError **error)
{
enum CRStatus status;
CRStyleSheet *stylesheet;
if (filename == NULL)
return NULL;
status = cr_om_parser_simply_parse_file ((const guchar *) filename,
CR_UTF_8,
&stylesheet);
if (status != CR_OK)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Error parsing stylesheet '%s'; errcode:%d", filename, status);
return NULL;
}
return stylesheet;
}
CRDeclaration *
_st_theme_parse_declaration_list (const char *str)
{
return cr_declaration_parse_list_from_buf ((const guchar *)str,
CR_UTF_8);
}
/* Just g_warning for now until we have something nicer to do */
static CRStyleSheet *
parse_stylesheet_nofail (const char *filename)
{
GError *error = NULL;
CRStyleSheet *result;
result = parse_stylesheet (filename, &error);
if (error)
{
g_warning ("%s", error->message);
g_clear_error (&error);
}
return result;
}
static void
insert_stylesheet (StTheme *theme,
const char *filename,
CRStyleSheet *stylesheet)
{
char *filename_copy;
if (stylesheet == NULL)
return;
filename_copy = g_strdup(filename);
cr_stylesheet_ref (stylesheet);
g_hash_table_insert (theme->stylesheets_by_filename, filename_copy, stylesheet);
g_hash_table_insert (theme->filenames_by_stylesheet, stylesheet, filename_copy);
}
gboolean
st_theme_load_stylesheet (StTheme *theme,
const char *path,
GError **error)
{
CRStyleSheet *stylesheet;
stylesheet = parse_stylesheet (path, error);
if (!stylesheet)
return FALSE;
insert_stylesheet (theme, path, stylesheet);
cr_stylesheet_ref (stylesheet);
theme->custom_stylesheets = g_slist_prepend (theme->custom_stylesheets, stylesheet);
return TRUE;
}
void
st_theme_unload_stylesheet (StTheme *theme,
const char *path)
{
CRStyleSheet *stylesheet;
stylesheet = g_hash_table_lookup (theme->stylesheets_by_filename, path);
if (!stylesheet)
return;
if (!g_slist_find (theme->custom_stylesheets, stylesheet))
return;
theme->custom_stylesheets = g_slist_remove (theme->custom_stylesheets, stylesheet);
g_hash_table_remove (theme->stylesheets_by_filename, path);
g_hash_table_remove (theme->filenames_by_stylesheet, stylesheet);
cr_stylesheet_unref (stylesheet);
}
static GObject *
st_theme_constructor (GType type,
guint n_construct_properties,
GObjectConstructParam *construct_properties)
{
GObject *object;
StTheme *theme;
CRStyleSheet *application_stylesheet;
CRStyleSheet *theme_stylesheet;
CRStyleSheet *default_stylesheet;
object = (*G_OBJECT_CLASS (st_theme_parent_class)->constructor) (type,
n_construct_properties,
construct_properties);
theme = ST_THEME (object);
application_stylesheet = parse_stylesheet_nofail (theme->application_stylesheet);
theme_stylesheet = parse_stylesheet_nofail (theme->theme_stylesheet);
default_stylesheet = parse_stylesheet_nofail (theme->default_stylesheet);
theme->cascade = cr_cascade_new (application_stylesheet,
theme_stylesheet,
default_stylesheet);
if (theme->cascade == NULL)
g_error ("Out of memory when creating cascade object");
insert_stylesheet (theme, theme->application_stylesheet, application_stylesheet);
insert_stylesheet (theme, theme->theme_stylesheet, theme_stylesheet);
insert_stylesheet (theme, theme->default_stylesheet, default_stylesheet);
return object;
}
static void
st_theme_finalize (GObject * object)
{
StTheme *theme = ST_THEME (object);
g_slist_foreach (theme->custom_stylesheets, (GFunc) cr_stylesheet_unref, NULL);
g_slist_free (theme->custom_stylesheets);
theme->custom_stylesheets = NULL;
g_hash_table_destroy (theme->stylesheets_by_filename);
g_hash_table_destroy (theme->filenames_by_stylesheet);
g_free (theme->application_stylesheet);
g_free (theme->theme_stylesheet);
g_free (theme->default_stylesheet);
if (theme->cascade)
{
cr_cascade_unref (theme->cascade);
theme->cascade = NULL;
}
G_OBJECT_CLASS (st_theme_parent_class)->finalize (object);
}
static void
st_theme_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
StTheme *theme = ST_THEME (object);
switch (prop_id)
{
case PROP_APPLICATION_STYLESHEET:
{
const char *path = g_value_get_string (value);
if (path != theme->application_stylesheet)
{
g_free (theme->application_stylesheet);
theme->application_stylesheet = g_strdup (path);
}
break;
}
case PROP_THEME_STYLESHEET:
{
const char *path = g_value_get_string (value);
if (path != theme->theme_stylesheet)
{
g_free (theme->theme_stylesheet);
theme->theme_stylesheet = g_strdup (path);
}
break;
}
case PROP_DEFAULT_STYLESHEET:
{
const char *path = g_value_get_string (value);
if (path != theme->default_stylesheet)
{
g_free (theme->default_stylesheet);
theme->default_stylesheet = g_strdup (path);
}
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
st_theme_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
StTheme *theme = ST_THEME (object);
switch (prop_id)
{
case PROP_APPLICATION_STYLESHEET:
g_value_set_string (value, theme->application_stylesheet);
break;
case PROP_THEME_STYLESHEET:
g_value_set_string (value, theme->theme_stylesheet);
break;
case PROP_DEFAULT_STYLESHEET:
g_value_set_string (value, theme->default_stylesheet);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* st_theme_new:
* @application_stylesheet: The highest priority stylesheet, representing application-specific
* styling; this is associated with the CSS "author" stylesheet, may be %NULL
* @theme_stylesheet: The second priority stylesheet, representing theme-specific styling ;
* this is associated with the CSS "user" stylesheet, may be %NULL
* @default_stylesheet: The lowest priority stylesheet, representing global default styling;
* this is associated with the CSS "user agent" stylesheet, may be %NULL
*
* Return value: the newly created theme object
**/
StTheme *
st_theme_new (const char *application_stylesheet,
const char *theme_stylesheet,
const char *default_stylesheet)
{
StTheme *theme = g_object_new (ST_TYPE_THEME,
"application-stylesheet", application_stylesheet,
"theme-stylesheet", theme_stylesheet,
"default-stylesheet", default_stylesheet,
NULL);
return theme;
}
static gboolean
string_in_list (GString *stryng,
const char *list)
{
const char *cur;
for (cur = list; *cur;)
{
while (*cur && cr_utils_is_white_space (*cur))
cur++;
if (strncmp (cur, stryng->str, stryng->len) == 0)
{
cur += stryng->len;
if ((!*cur) || cr_utils_is_white_space (*cur))
return TRUE;
}
/* skip to next whitespace character */
while (*cur && !cr_utils_is_white_space (*cur))
cur++;
}
return FALSE;
}
static gboolean
pseudo_class_add_sel_matches_style (StTheme *a_this,
CRAdditionalSel *a_add_sel,
StThemeNode *a_node)
{
const char *node_pseudo_class;
g_return_val_if_fail (a_this
&& a_add_sel
&& a_add_sel->content.pseudo
&& a_add_sel->content.pseudo->name
&& a_add_sel->content.pseudo->name->stryng
&& a_add_sel->content.pseudo->name->stryng->str
&& a_node, FALSE);
node_pseudo_class = st_theme_node_get_pseudo_class (a_node);
if (node_pseudo_class == NULL)
return FALSE;
return string_in_list (a_add_sel->content.pseudo->name->stryng, node_pseudo_class);
}
/**
*@param a_add_sel the class additional selector to consider.
*@param a_node the style node to consider.
*@return TRUE if the class additional selector matches
*the style node given in argument, FALSE otherwise.
*/
static gboolean
class_add_sel_matches_style (CRAdditionalSel *a_add_sel,
StThemeNode *a_node)
{
const char *element_class;
g_return_val_if_fail (a_add_sel
&& a_add_sel->type == CLASS_ADD_SELECTOR
&& a_add_sel->content.class_name
&& a_add_sel->content.class_name->stryng
&& a_add_sel->content.class_name->stryng->str
&& a_node, FALSE);
element_class = st_theme_node_get_element_class (a_node);
if (element_class == NULL)
return FALSE;
return string_in_list (a_add_sel->content.class_name->stryng, element_class);
}
/**
*@return TRUE if the additional attribute selector matches
*the current style node given in argument, FALSE otherwise.
*@param a_add_sel the additional attribute selector to consider.
*@param a_node the style node to consider.
*/
static gboolean
id_add_sel_matches_style (CRAdditionalSel *a_add_sel,
StThemeNode *a_node)
{
gboolean result = FALSE;
const char *id;
g_return_val_if_fail (a_add_sel
&& a_add_sel->type == ID_ADD_SELECTOR
&& a_add_sel->content.id_name
&& a_add_sel->content.id_name->stryng
&& a_add_sel->content.id_name->stryng->str
&& a_node, FALSE);
g_return_val_if_fail (a_add_sel
&& a_add_sel->type == ID_ADD_SELECTOR
&& a_node, FALSE);
id = st_theme_node_get_element_id (a_node);
if (id != NULL)
{
if (!strqcmp (id, a_add_sel->content.id_name->stryng->str,
a_add_sel->content.id_name->stryng->len))
{
result = TRUE;
}
}
return result;
}
/**
*additional_selector_matches_style:
*Evaluates if a given additional selector matches an style node.
*@param a_add_sel the additional selector to consider.
*@param a_node the style node to consider.
*@return TRUE is a_add_sel matches a_node, FALSE otherwise.
*/
static gboolean
additional_selector_matches_style (StTheme *a_this,
CRAdditionalSel *a_add_sel,
StThemeNode *a_node)
{
CRAdditionalSel *cur_add_sel = NULL;
g_return_val_if_fail (a_add_sel, FALSE);
for (cur_add_sel = a_add_sel; cur_add_sel; cur_add_sel = cur_add_sel->next)
{
switch (cur_add_sel->type)
{
case NO_ADD_SELECTOR:
return FALSE;
case CLASS_ADD_SELECTOR:
if (!class_add_sel_matches_style (cur_add_sel, a_node))
return FALSE;
break;
case ID_ADD_SELECTOR:
if (!id_add_sel_matches_style (cur_add_sel, a_node))
return FALSE;
break;
case ATTRIBUTE_ADD_SELECTOR:
g_warning ("Attribute selectors not supported");
return FALSE;
case PSEUDO_CLASS_ADD_SELECTOR:
if (!pseudo_class_add_sel_matches_style (a_this, cur_add_sel, a_node))
return FALSE;
break;
}
}
return TRUE;
}
static gboolean
element_name_matches_type (const char *element_name,
GType element_type)
{
if (element_type == G_TYPE_NONE)
{
return strcmp (element_name, "stage") == 0;
}
else
{
GType match_type = g_type_from_name (element_name);
if (match_type == G_TYPE_INVALID)
return FALSE;
return g_type_is_a (element_type, match_type);
}
}
/**
*Evaluate a selector (a simple selectors list) and says
*if it matches the style node given in parameter.
*The algorithm used here is the following:
*Walk the combinator separated list of simple selectors backward, starting
*from the end of the list. For each simple selector, looks if
*if matches the current style.
*
*@param a_this the selection engine.
*@param a_sel the simple selection list.
*@param a_node the style node.
*@param a_result out parameter. Set to true if the
*selector matches the style node, FALSE otherwise.
*@param a_recurse if set to TRUE, the function will walk to
*the next simple selector (after the evaluation of the current one)
*and recursively evaluate it. Must be usually set to TRUE unless you
*know what you are doing.
*/
static enum CRStatus
sel_matches_style_real (StTheme *a_this,
CRSimpleSel *a_sel,
StThemeNode *a_node,
gboolean *a_result,
gboolean a_eval_sel_list_from_end,
gboolean a_recurse)
{
CRSimpleSel *cur_sel = NULL;
StThemeNode *cur_node = NULL;
GType cur_type;
*a_result = FALSE;
if (a_eval_sel_list_from_end)
{
/*go and get the last simple selector of the list */
for (cur_sel = a_sel; cur_sel && cur_sel->next; cur_sel = cur_sel->next)
;
}
else
{
cur_sel = a_sel;
}
cur_node = a_node;
cur_type = st_theme_node_get_element_type (cur_node);
while (cur_sel)
{
if (((cur_sel->type_mask & TYPE_SELECTOR)
&& (cur_sel->name
&& cur_sel->name->stryng
&& cur_sel->name->stryng->str)
&&
(element_name_matches_type (cur_sel->name->stryng->str, cur_type)))
|| (cur_sel->type_mask & UNIVERSAL_SELECTOR))
{
/*
*this simple selector
*matches the current style node
*Let's see if the preceding
*simple selectors also match
*their style node counterpart.
*/
if (cur_sel->add_sel)
{
if (additional_selector_matches_style (a_this, cur_sel->add_sel, cur_node))
goto walk_a_step_in_expr;
else
goto done;
}
else
goto walk_a_step_in_expr;
}
if (!(cur_sel->type_mask & TYPE_SELECTOR)
&& !(cur_sel->type_mask & UNIVERSAL_SELECTOR))
{
if (!cur_sel->add_sel)
goto done;
if (additional_selector_matches_style (a_this, cur_sel->add_sel, cur_node))
goto walk_a_step_in_expr;
else
goto done;
}
else
{
goto done;
}
walk_a_step_in_expr:
if (a_recurse == FALSE)
{
*a_result = TRUE;
goto done;
}
/*
*here, depending on the combinator of cur_sel
*choose the axis of the element tree traversal
*and walk one step in the element tree.
*/
if (!cur_sel->prev)
break;
switch (cur_sel->combinator)
{
case NO_COMBINATOR:
break;
case COMB_WS: /*descendant selector */
{
StThemeNode *n = NULL;
/*
*walk the element tree upward looking for a parent
*style that matches the preceding selector.
*/
for (n = st_theme_node_get_parent (a_node); n; n = st_theme_node_get_parent (n))
{
enum CRStatus status;
gboolean matches = FALSE;
status = sel_matches_style_real (a_this, cur_sel->prev, n, &matches, FALSE, TRUE);
if (status != CR_OK)
goto done;
if (matches)
{
cur_node = n;
cur_type = st_theme_node_get_element_type (cur_node);
break;
}
}
if (!n)
{
/*
*didn't find any ancestor that matches
*the previous simple selector.
*/
goto done;
}
/*
*in this case, the preceding simple sel
*will have been interpreted twice, which
*is a cpu and mem waste ... I need to find
*another way to do this. Anyway, this is
*my first attempt to write this function and
*I am a bit clueless.
*/
break;
}
case COMB_PLUS:
g_warning ("+ combinators are not supported");
goto done;
case COMB_GT:
cur_node = st_theme_node_get_parent (cur_node);
if (!cur_node)
goto done;
cur_type = st_theme_node_get_element_type (cur_node);
break;
default:
goto done;
}
cur_sel = cur_sel->prev;
}
/*
*if we reached this point, it means the selector matches
*the style node.
*/
*a_result = TRUE;
done:
return CR_OK;
}
static void
add_matched_properties (StTheme *a_this,
CRStyleSheet *a_nodesheet,
StThemeNode *a_node,
GPtrArray *props)
{
CRStatement *cur_stmt = NULL;
CRSelector *sel_list = NULL;
CRSelector *cur_sel = NULL;
gboolean matches = FALSE;
enum CRStatus status = CR_OK;
/*
*walk through the list of statements and,
*get the selectors list inside the statements that
*contain some, and try to match our style node in these
*selectors lists.
*/
for (cur_stmt = a_nodesheet->statements; cur_stmt; cur_stmt = cur_stmt->next)
{
/*
*initialyze the selector list in which we will
*really perform the search.
*/
sel_list = NULL;
/*
*get the the damn selector list in
*which we have to look
*/
switch (cur_stmt->type)
{
case RULESET_STMT:
if (cur_stmt->kind.ruleset && cur_stmt->kind.ruleset->sel_list)
{
sel_list = cur_stmt->kind.ruleset->sel_list;
}
break;
case AT_MEDIA_RULE_STMT:
if (cur_stmt->kind.media_rule
&& cur_stmt->kind.media_rule->rulesets
&& cur_stmt->kind.media_rule->rulesets->kind.ruleset
&& cur_stmt->kind.media_rule->rulesets->kind.ruleset->sel_list)
{
sel_list = cur_stmt->kind.media_rule->rulesets->kind.ruleset->sel_list;
}
break;
case AT_IMPORT_RULE_STMT:
{
CRAtImportRule *import_rule = cur_stmt->kind.import_rule;
if (import_rule->sheet == NULL)
{
char *filename = NULL;
if (import_rule->url->stryng && import_rule->url->stryng->str)
filename = _st_theme_resolve_url (a_this,
a_nodesheet,
import_rule->url->stryng->str);
if (filename)
import_rule->sheet = parse_stylesheet (filename, NULL);
if (import_rule->sheet)
{
insert_stylesheet (a_this, filename, import_rule->sheet);
/* refcount of stylesheets starts off at zero, so we don't need to unref! */
}
else
{
/* Set a marker to avoid repeatedly trying to parse a non-existent or
* broken stylesheet
*/
import_rule->sheet = (CRStyleSheet *) - 1;
}
if (filename)
g_free (filename);
}
if (import_rule->sheet != (CRStyleSheet *) - 1)
{
add_matched_properties (a_this, import_rule->sheet,
a_node, props);
}
}
break;
default:
break;
}
if (!sel_list)
continue;
/*
*now, we have a comma separated selector list to look in.
*let's walk it and try to match the style node
*on each item of the list.
*/
for (cur_sel = sel_list; cur_sel; cur_sel = cur_sel->next)
{
if (!cur_sel->simple_sel)
continue;
status = sel_matches_style_real (a_this, cur_sel->simple_sel, a_node, &matches, TRUE, TRUE);
if (status == CR_OK && matches)
{
CRDeclaration *cur_decl = NULL;
/* In order to sort the matching properties, we need to compute the
* specificity of the selector that actually matched this
* element. In a non-thread-safe fashion, we store it in the
* ruleset. (Fixing this would mean cut-and-pasting
* cr_simple_sel_compute_specificity(), and have no need for
* thread-safety anyways.)
*
* Once we've sorted the properties, the specificity no longer
* matters and it can be safely overriden.
*/
cr_simple_sel_compute_specificity (cur_sel->simple_sel);
cur_stmt->specificity = cur_sel->simple_sel->specificity;
for (cur_decl = cur_stmt->kind.ruleset->decl_list; cur_decl; cur_decl = cur_decl->next)
g_ptr_array_add (props, cur_decl);
}
}
}
}
#define ORIGIN_AUTHOR_IMPORTANT (ORIGIN_AUTHOR + 1)
#define ORIGIN_USER_IMPORTANT (ORIGIN_AUTHOR + 2)
static inline int
get_origin (const CRDeclaration * decl)
{
enum CRStyleOrigin origin = decl->parent_statement->parent_sheet->origin;
if (decl->important)
{
if (origin == ORIGIN_AUTHOR)
return ORIGIN_AUTHOR_IMPORTANT;
else if (origin == ORIGIN_USER)
return ORIGIN_USER_IMPORTANT;
}
return origin;
}
/* Order of comparison is so that higher priority statements compare after
* lower priority statements */
static int
compare_declarations (gconstpointer a,
gconstpointer b)
{
/* g_ptr_array_sort() is broooken */
CRDeclaration *decl_a = *(CRDeclaration **) a;
CRDeclaration *decl_b = *(CRDeclaration **) b;
int origin_a = get_origin (decl_a);
int origin_b = get_origin (decl_b);
if (origin_a != origin_b)
return origin_a - origin_b;
if (decl_a->parent_statement->specificity != decl_b->parent_statement->specificity)
return decl_a->parent_statement->specificity - decl_b->parent_statement->specificity;
return 0;
}
GPtrArray *
_st_theme_get_matched_properties (StTheme *theme,
StThemeNode *node)
{
enum CRStyleOrigin origin = 0;
CRStyleSheet *sheet = NULL;
GPtrArray *props = g_ptr_array_new ();
GSList *iter;
g_return_val_if_fail (ST_IS_THEME (theme), NULL);
g_return_val_if_fail (ST_IS_THEME_NODE (node), NULL);
for (origin = ORIGIN_UA; origin < NB_ORIGINS; origin++)
{
sheet = cr_cascade_get_sheet (theme->cascade, origin);
if (!sheet)
continue;
add_matched_properties (theme, sheet, node, props);
}
for (iter = theme->custom_stylesheets; iter; iter = iter->next)
add_matched_properties (theme, iter->data, node, props);
/* We count on a stable sort here so that later declarations come
* after earlier declarations */
g_ptr_array_sort (props, compare_declarations);
return props;
}
/* Resolve an url from an url() reference in a stylesheet into an absolute
* local filename, if possible. The resolution here is distinctly lame and
* will fail on many examples.
*/
char *
_st_theme_resolve_url (StTheme *theme,
CRStyleSheet *base_stylesheet,
const char *url)
{
const char *base_filename = NULL;
char *dirname;
char *filename;
/* Handle absolute file:/ URLs */
if (g_str_has_prefix (url, "file:") ||
g_str_has_prefix (url, "File:") ||
g_str_has_prefix (url, "FILE:"))
{
GError *error = NULL;
char *filename;
filename = g_filename_from_uri (url, NULL, &error);
if (filename == NULL)
{
g_warning ("%s", error->message);
g_error_free (error);
}
return NULL;
}
/* Guard against http:/ URLs */
if (g_str_has_prefix (url, "http:") ||
g_str_has_prefix (url, "Http:") ||
g_str_has_prefix (url, "HTTP:"))
{
g_warning ("Http URL '%s' in theme stylesheet is not supported", url);
return NULL;
}
/* Assume anything else is a relative URL, and "resolve" it
*/
if (url[0] == '/')
return g_strdup (url);
base_filename = g_hash_table_lookup (theme->filenames_by_stylesheet, base_stylesheet);
if (base_filename == NULL)
{
g_warning ("Can't get base to resolve url '%s'", url);
return NULL;
}
dirname = g_path_get_dirname (base_filename);
filename = g_build_filename (dirname, url, NULL);
g_free (dirname);
return filename;
}