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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set sw=4 sts=4 ts=4 expandtab: */
/*
rsvg-cond.c: Handle SVG conditionals
Copyright (C) 2004-2005 Dom Lachowicz <cinamod@hotmail.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
Author: Dom Lachowicz
*/
#include "config.h"
#include "rsvg.h"
#include "rsvg-private.h"
#include "rsvg-css.h"
#include "rsvg-styles.h"
#include <string.h>
#include <stdlib.h>
#include <locale.h>
static const char *implemented_features[] = {
"http://www.w3.org/TR/SVG11/feature#BasicText",
"http://www.w3.org/TR/SVG11/feature#BasicFilter",
"http://www.w3.org/TR/SVG11/feature#BasicGraphicsAttribute",
"http://www.w3.org/TR/SVG11/feature#BasicPaintAttribute",
"http://www.w3.org/TR/SVG11/feature#BasicStructure",
"http://www.w3.org/TR/SVG11/feature#ConditionalProcessing",
"http://www.w3.org/TR/SVG11/feature#ContainerAttribute",
"http://www.w3.org/TR/SVG11/feature#Filter",
"http://www.w3.org/TR/SVG11/feature#Gradient",
"http://www.w3.org/TR/SVG11/feature#Image",
"http://www.w3.org/TR/SVG11/feature#Marker",
"http://www.w3.org/TR/SVG11/feature#Mask",
"http://www.w3.org/TR/SVG11/feature#OpacityAttribute",
"http://www.w3.org/TR/SVG11/feature#Pattern",
"http://www.w3.org/TR/SVG11/feature#Shape",
"http://www.w3.org/TR/SVG11/feature#Structure",
"http://www.w3.org/TR/SVG11/feature#Style",
"http://www.w3.org/TR/SVG11/feature#SVG",
"http://www.w3.org/TR/SVG11/feature#SVG-static",
"http://www.w3.org/TR/SVG11/feature#View",
"org.w3c.svg.static" /* deprecated SVG 1.0 feature string */
};
static const guint nb_implemented_features = G_N_ELEMENTS (implemented_features);
static const char **implemented_extensions = NULL;
static const guint nb_implemented_extensions = 0;
static int
rsvg_feature_compare (const void *a, const void *b)
{
return strcmp ((const char *) a, *(const char **) b);
}
/* http://www.w3.org/TR/SVG/struct.html#RequiredFeaturesAttribute */
static gboolean
rsvg_cond_fulfills_requirement (const char *value, const char **features, guint nb_features)
{
guint nb_elems = 0;
char **elems;
gboolean permitted = TRUE;
elems = rsvg_css_parse_list (value, &nb_elems);
if (elems && nb_elems) {
guint i;
for (i = 0; (i < nb_elems) && permitted; i++)
if (!bsearch (elems[i], features, nb_features, sizeof (char *), rsvg_feature_compare))
permitted = FALSE;
g_strfreev (elems);
} else
permitted = FALSE;
return permitted;
}
/* http://www.w3.org/TR/SVG/struct.html#SystemLanguageAttribute */
static gboolean
rsvg_locale_compare (const char *a, const char *b)
{
const char *hyphen;
/* check for an exact-ish match first */
if (!g_ascii_strncasecmp (a, b, strlen (b)))
return TRUE;
/* check to see if there's a hyphen */
hyphen = strstr (b, "-");
if (!hyphen)
return FALSE;
/* compare up to the hyphen */
return !g_ascii_strncasecmp (a, b, (hyphen - b));
}
/* http://www.w3.org/TR/SVG/struct.html#SystemLanguageAttribute */
static gboolean
rsvg_cond_parse_system_language (const char *value)
{
guint nb_elems = 0;
char **elems;
gboolean permitted = TRUE;
elems = rsvg_css_parse_list (value, &nb_elems);
if (elems && nb_elems) {
guint i;
gchar *locale = NULL;
/* we're required to be pessimistic until we hit a language we recognize */
permitted = FALSE;
#if defined(G_OS_WIN32)
if (!locale)
locale = g_win32_getlocale ();
#endif
if (!locale)
locale = g_strdup (g_getenv ("LANG"));
#if defined(HAVE_LC_MESSAGES)
if (!locale)
locale = g_strdup (setlocale (LC_MESSAGES, NULL));
#endif
if (!locale)
locale = g_strdup (setlocale (LC_ALL, NULL));
if (!locale || strcmp (locale, "C") == 0) {
g_free (locale);
locale = g_strdup ("en");
}
if (locale) {
for (i = 0; (i < nb_elems) && !permitted; i++) {
if (rsvg_locale_compare (locale, elems[i]))
permitted = TRUE;
}
g_free (locale);
}
g_strfreev (elems);
} else
permitted = FALSE;
return permitted;
}
/* returns TRUE if this element should be processed according to <switch> semantics
http://www.w3.org/TR/SVG/struct.html#SwitchElement */
gboolean
rsvg_eval_switch_attributes (RsvgPropertyBag * atts, gboolean * p_has_cond)
{
gboolean permitted = TRUE;
gboolean has_cond = FALSE;
if (atts && rsvg_property_bag_size (atts)) {
const char *value;
if ((value = rsvg_property_bag_lookup (atts, "requiredFeatures"))) {
permitted =
rsvg_cond_fulfills_requirement (value, implemented_features,
nb_implemented_features);
has_cond = TRUE;
}
if (permitted && (value = rsvg_property_bag_lookup (atts, "requiredExtensions"))) {
permitted =
rsvg_cond_fulfills_requirement (value, implemented_extensions,
nb_implemented_extensions);
has_cond = TRUE;
}
if (permitted && (value = rsvg_property_bag_lookup (atts, "systemLanguage"))) {
permitted = rsvg_cond_parse_system_language (value);
has_cond = TRUE;
}
}
if (p_has_cond)
*p_has_cond = has_cond;
return permitted;
}
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