diff -r 000000000000 -r 16c7fa9b7c49 src/lib/INIReader.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/lib/INIReader.cpp	Sat Nov 21 18:26:39 2020 +0100
@@ -0,0 +1,69 @@
+/**
+ * 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 <vector>
+
+#include "INIReader.h"
+
+class INIReaderImpl : public INIReader {
+private:
+	std::istream& input;
+	std::vector<INIContentHandler*> handlers;
+public:
+
+	INIReaderImpl(std::istream& input) : input(input) {
+	}
+
+	void addHandler(INIContentHandler* handler) override {
+		handlers.push_back(handler);
+	}
+
+	void process() override {
+		
+		// TODO: real parser instead of demo data
+		for (INIContentHandler* handler : handlers) {
+			handler->startDocument();
+			
+			handler->entry("key-0", "outside sections");
+			
+			handler->startSection("section-1");
+			handler->entry("key-1", "in section 1");
+			handler->entry("key-2", "in section 1");
+			handler->entry("key-3", "in section 1");
+			
+			handler->startSection("nested-section-1-1");
+			handler->entry("key-1", "in nested section 1-1");
+			handler->entry("key-2", "in nested section 1-1");
+			handler->endSection();
+			
+			handler->endSection();
+			
+			handler->startSection("section-2");
+			handler->entry("key-1", "in section 2");
+			handler->endSection();
+			
+			handler->entry("key-666", "outside sections again; this normally would not happen, but should be supported");
+			
+			handler->endDocument();
+		}
+		
+	}
+};
+
+INIReader* INIReader::create(std::istream& input) {
+	return new INIReaderImpl(input);
+}