# HG changeset patch
# User František Kučera <franta-hg@frantovo.cz>
# Date 1580081396 -3600
# Node ID 6944a03fb88306993ea4d8a3f1c3831a75f44d98
# Parent  7ba9d703fadb1679623c6e1585b38cc9a642605d
streamlet examples: xpath – parse and validate XML document

diff -r 7ba9d703fadb -r 6944a03fb883 streamlet-examples/xpath.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/streamlet-examples/xpath.cpp	Mon Jan 27 00:29:56 2020 +0100
@@ -0,0 +1,46 @@
+/**
+ * Relational pipes
+ * Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "streamlet-common.h"
+
+#include <libxml++-2.6/libxml++/libxml++.h>
+
+class XPathStreamlet : public Streamlet {
+
+	std::vector<AttributeMetadata> getOutputAttributesMetadata() override {
+		std::vector<AttributeMetadata> oam;
+		oam.push_back({getAlias(0, L"xpath"), L"string"});
+		return oam;
+	}
+
+	std::vector<OutputAttribute> getOutputAttributes() override {
+		std::vector<OutputAttribute> oa;
+
+		try {
+			xmlpp::DomParser parser;
+			parser.parse_file(convertor.to_bytes(currentFile));
+			xmlpp::Element* root = parser.get_document()->get_root_node();
+			oa.push_back({L"XML OK", false});
+		} catch (...) {
+			oa.push_back({L"invalid XML", true});
+		}
+
+		return oa;
+	}
+};
+
+STREAMLET_RUN(XPathStreamlet)