/**

 * 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/>.

 */

#pragma once

#include <sstream>

#include "INIReader.h"

using namespace std;

using namespace relpipe::writer;

namespace relpipe {

namespace in {

namespace ini {

namespace lib {

class UnescapingINIContentHandler : public INIContentHandler {

private:

	INIContentHandler& output;

protected:

	const char ESC = '\\';

	bool lastEscaphingPhase;

	std::stringstream& put(std::stringstream& result, const char& ch, int& i) {

		result.put(ch);

		i++;

		return result;

	}

	virtual std::string unescape(const std::string& s) = 0;

public:

	/**

	 * @param output here will be sent events with unescaped values

	 * @param lastEscaphingPhase instances of UnescapingINIContentHandler might be chained:

	 * unsupported escaping sequences are kept untouched to be processed in further phases;

	 * in the last phase, all remaining sequences (including \\) must be recognized and unescaped

	 * (otherwise the input is considered invalid and an exception is thrown)

	 */

	UnescapingINIContentHandler(INIContentHandler& output, bool lastEscaphingPhase) : output(output), lastEscaphingPhase(lastEscaphingPhase) {

	}

	void startDocument() override {

		output.startDocument();

	}

	void endDocument() override {

		output.endDocument();

	}

	void startSection(const SectionStartEvent& event) override {

		SectionStartEvent e = event;

		e.name = unescape(e.name);

		output.startSection(e);

	}

	void endSection() override {

		output.endSection();

	}

	void entry(const EntryEvent& event) override {

		EntryEvent e = event;

		e.key = unescape(e.key);

		e.fullKey = unescape(e.fullKey);

		e.subKey = unescape(e.subKey);

		e.value = unescape(e.value);

		output.entry(e);

	}

	void comment(const CommentEvent& event) override {

		output.comment(event);

	}

	void whitespace(const WhitespaceEvent& event) override {

		output.whitespace(event);

	}

};

}

}

}

}