From d99095f4a181357bf0c6d10846351eb0b58b1ccf Mon Sep 17 00:00:00 2001
From: Andreas Stöckel <astoecke@techfak.uni-bielefeld.de>
Date: Thu, 6 Mar 2014 00:11:17 +0000
Subject: started to implement rudimentary XML reader (implemented expectOneOf
 function), changed some conventions in the used files (namespaces, include
 guards), moved anchor class from domain to document package, removed
 everything that does not work now from the CMakeLists.txt

git-svn-id: file:///var/local/svn/basicwriter@24 daaaf23c-2e50-4459-9457-1e69db5a47bf
---
 src/xml/XmlReader.cpp | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 src/xml/XmlReader.cpp

(limited to 'src/xml/XmlReader.cpp')

diff --git a/src/xml/XmlReader.cpp b/src/xml/XmlReader.cpp
new file mode 100644
index 0000000..fd03ffb
--- /dev/null
+++ b/src/xml/XmlReader.cpp
@@ -0,0 +1,99 @@
+/*
+    Ousía
+    Copyright (C) 2014  Benjamin Paaßen, Andreas Stöckel
+
+    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, either version 3 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 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 <QXmlStreamReader>
+
+#include <sstream>
+#include <iostream>
+
+#include "XmlElementHandler.hpp"
+#include "XmlReader.hpp"
+
+namespace ousia {
+namespace xml {
+
+XmlReader::XmlReader(QXmlStreamReader &xml) :
+	xml(xml)
+{
+	// Do nothing here
+}
+
+bool XmlReader::expectOneOf(std::vector<XmlElementHandler> &handlers)
+{
+	// Skip all tokens except for "start element" and "end element"
+	while (!xml.atEnd()) {
+		// TODO: Implement mechanism for using the current state of the
+		// XmlStreamReader instead of always reading the next token?
+		const auto tokenType = xml.readNext();
+		switch (tokenType) {
+			case QXmlStreamReader::StartElement:
+				for (auto &h : handlers) {
+					if (h.matches(xml.name())) {
+						return h.execute();
+					}
+				}
+				// Expected tag was not found, display error message
+				// TODO: Use better logging mechanism!
+				std::cout << "Expected one of the following tags: ("
+						<<  XmlElementHandler::expectedElementsStr(handlers)
+						<< "); but found element \""
+						<< xml.name().toString().toStdString()
+						<< "\" instead!" << std::endl;
+				return false;
+			case QXmlStreamReader::EndElement:
+				// Expected tag was not found, instead we found a closing tag!
+				// TODO: Use better logging mechanism!
+				std::cout << "Expected one of the following tags: ("
+						<<  XmlElementHandler::expectedElementsStr(handlers)
+						<< "); but found end of element \""
+						<< xml.name().toString().toStdString()
+						<< "\" instead!" << std::endl;
+				return false;
+			default:
+				continue;
+		}
+	}
+	return false;
+}
+
+std::shared_ptr<model::GraphNode> XmlReader::process()
+{
+	std::shared_ptr<model::GraphNode> res{nullptr};
+	std::vector<XmlElementHandler> handlers{
+		{"domain", [&](){return (res = this->readDomain()) != nullptr;}}
+	};
+	if (!expectOneOf(handlers)) {
+		std::cout << "Errors occured while parsing XML file!" << std::endl;
+		return nullptr;
+	}
+	return res;
+}
+
+std::shared_ptr<model::domain::Domain> XmlReader::readDomain()
+{
+	if (!xml.attributes().hasAttribute("name")) {
+		std::cout << "Expected name attribute!" << std::endl;
+		return nullptr;
+	}
+	std::cout << "domain name: " << xml.attributes().value("name").toString().toStdString() << std::endl;
+	return std::shared_ptr<model::domain::Domain>(new model::domain::Domain());
+}
+
+}
+}
+
-- 
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