Support for elements of config.xml

This add some elements intended to be used later when handling
data coming from config.xml of widgets.

Change-Id: I1df9eb158d5c37578c9c7a8caa9eb8f85527ca4b

1 files changed, 215 insertions, 0 deletions

diff --git a/wgt-config-xml.c b/wgt-config-xml.c
new file mode 100644
index 0000000..41c2085
--- /dev/null
+++ b/wgt-config-xml.c
@@ -0,0 +1,215 @@
+/*
+ Copyright 2015 IoT.bzh
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+#include <string.h>
+#include <syslog.h>
+#include <assert.h>
+#include <errno.h>
+
+#include <libxml/parser.h>
+#include <libxml/tree.h>
+#include <libxml/uri.h>
+
+
+#include "wgt.h"
+
+static xmlDocPtr configxml = NULL;
+
+static xmlNodePtr next(xmlNodePtr node, const char *type)
+{
+	while (node && node->type != XML_ELEMENT_NODE && strcmp(type, node->name))
+		node = node->next;
+	return node;
+}
+
+static xmlNodePtr first(const char *type)
+{
+	xmlNodePtr root;
+	if (configxml) {
+		root = xmlDocGetRootElement(configxml);
+		if (root)
+			return next(root->children, type);
+	}
+	return NULL;
+}
+
+static xmlNodePtr element_based_localisation(const char *type)
+{
+	xmlNodePtr resu;
+	char *lang;
+
+	resu = first(type);
+	while (resu) {
+		lang = xmlNodeGetLang(resu);
+		if (lang) {
+			xmlFree(lang);
+		}
+		resu = next(resu->next, type);
+	}
+	return resu;
+}
+
+void confixml_close()
+{
+	if (configxml) {
+		xmlFreeDoc(configxml);
+		configxml = NULL;
+	}
+}
+
+int confixml_open()
+{
+	assert(!configxml);
+	configxml = xmlReadFile(_config_xml_, NULL, 0);
+	if (configxml == NULL) {
+		syslog(LOG_ERR, "xml parse of config file %s failed", _config_xml_);
+		return -1;
+	}
+	return 0;
+}
+
+/* elements based on localisation */
+xmlNodePtr confixml_name()
+{
+	return element_based_localisation(_name_);
+}
+
+xmlNodePtr confixml_description()
+{
+	return element_based_localisation(_description_);
+}
+
+xmlNodePtr confixml_license()
+{
+	return element_based_localisation(_license_);
+}
+
+/* elements based on path localisation */
+xmlNodePtr confixml_author()
+{
+	return first(_author_);
+}
+
+xmlNodePtr confixml_content()
+{
+	return first(_content_);
+}
+
+/* element multiple */
+
+xmlNodePtr confixml_first_feature()
+{
+	return first(_feature_);
+}
+
+xmlNodePtr confixml_next_feature(xmlNodePtr node)
+{
+	return next(node->next, _feature_);
+}
+
+xmlNodePtr confixml_first_preference()
+{
+	return first(_preference_);
+}
+
+xmlNodePtr confixml_next_preference(xmlNodePtr node)
+{
+	return next(node->next, _preference_);
+}
+
+xmlNodePtr confixml_first_icon()
+{
+	return first(_icon_);
+}
+
+xmlNodePtr confixml_next_icon(xmlNodePtr node)
+{
+	return next(node->next, _icon_);
+}
+
+/* best sized icon */
+
+static int score_dim(xmlNodePtr ref, xmlNodePtr x, const char *dim, int request)
+{
+	int r, iref, ix;
+	char *sref, *sx;
+
+	sref = xmlGetProp(ref, dim);
+	if (sref) {
+		iref = atoi(sref);
+		xmlFree(sref);
+		sx = xmlGetProp(x, dim);
+		if (sx) {
+			/* sref && sx */
+			ix = atoi(sx);
+			xmlFree(sx);
+			if (ix >= request) {
+				if (iref >= request)
+					r = ix - iref;
+				else
+					r = request - ix;
+			} else {
+				if (iref >= request)
+					r = iref - request;
+				else
+					r = iref - ix;
+			}
+		} else {
+			/* sref && !sx */
+			if (iref >= request)
+				r = iref - request;
+			else
+				r = 0;
+		}
+	} else {
+		sx = xmlGetProp(x, dim);
+		if (sx) {
+			/* !sref && sx */
+			ix = atoi(sx);
+			xmlFree(sx);
+			if (ix >= request)
+				r = request - ix;
+			else
+				r = 0;
+		} else {
+			/* !sref && !sx */
+			r = 0;
+		}
+	}
+	return r;
+}
+
+static int better_icon(xmlNodePtr ref, xmlNodePtr x, int width, int height)
+{
+	int sw = score_dim(ref, x, _width_, width);
+	int sh = score_dim(ref, x, _height_, height);
+	return sw+sh < 0;
+}
+
+xmlNodePtr confixml_icon(int width, int height)
+{
+	xmlNodePtr resu, icon;
+
+	resu = confixml_first_icon();
+	icon = confixml_next_icon(resu);
+	while (icon) {
+		if (better_icon(resu, icon, width, height))
+			resu = icon;
+		icon = confixml_next_icon(icon);
+	}
+	return resu;
+}
+