src/RecfileCommand.h
author František Kučera <franta-hg@frantovo.cz>
Sat, 06 Apr 2019 17:33:42 +0200
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parse recfile (logical lines)
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/**
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 * Relational pipes
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 * Copyright © 2019 František Kučera (Frantovo.cz, GlobalCode.info)
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation, either version 3 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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 */
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#pragma once
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#include <iostream>
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#include <string>
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#include <sstream>
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#include <vector>
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#include <relpipe/writer/typedefs.h>
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namespace relpipe {
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namespace in {
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namespace recfile {
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using namespace relpipe::writer;
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class RecfileCommand {
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private:
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	enum class RecfileLineType {
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		METADATA,
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		DATA,
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		SEPARATOR,
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		COMMENT,
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	};
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	class RecfileHandler {
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	private:
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		RelationalWriter* writer;
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	public:
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		RecfileHandler(RelationalWriter* writer) : writer(writer) {
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		}
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		virtual ~RecfileHandler() {
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		}
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		void logicalLine(RecfileLineType type, const string_t& name = L"", const string_t& value = L"") {
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			std::wcerr << L"logicalLine(" << (int) type << L", " << name << L", " << value << L");" << std::endl; // TODO: remove debug
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			// TODO: writer->startRelation()
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			// TODO: writer->writeAttribute()
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		}
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	};
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	enum class ParserState {
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		START,
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		NAME,
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		VALUE,
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		VALUE_CONTINUATION,
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		COMMENT,
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		END,
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	};
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	class RecfileParser {
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	private:
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		wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings or are recfiles always in UTF-8?
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		RecfileHandler& handler;
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		void emitLogicalLine(RecfileLineType& type, std::stringstream& name, std::stringstream& value) {
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			handler.logicalLine(type, convertor.from_bytes(name.str()), convertor.from_bytes(value.str()));
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			name.str("");
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			name.clear();
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			value.str("");
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			value.clear();
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			type = RecfileLineType::DATA;
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		}
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	public:
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		RecfileParser(RecfileHandler& handler) : handler(handler) {
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		}
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		virtual ~RecfileParser() {
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		}
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		void parse(std::istream& input) {
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			ParserState state = ParserState::START;
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			RecfileLineType type = RecfileLineType::DATA;
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			std::stringstream name;
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			std::stringstream value;
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			char ch;
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			while (state != ParserState::END && input.good()) {
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				ch = input.get();
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				if (input.eof()) continue;
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				switch (state) {
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					case ParserState::START:
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						if (ch == '%') {
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							type = RecfileLineType::METADATA;
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							break;
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						} else if (ch == ' ') {
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							break;
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						} else if (ch == '\n') {
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							handler.logicalLine(RecfileLineType::SEPARATOR);
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							break;
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						} else if (ch == '#') {
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							type = RecfileLineType::COMMENT;
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							state = ParserState::COMMENT;
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							if (input.get() != ' ') input.unget();
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							break;
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						} // else → name
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					case ParserState::NAME:
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						if (ch == ':') {
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							state = ParserState::VALUE;
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							if (input.get() != ' ') input.unget();
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						} else {
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							name << ch;
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						}
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						break;
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					case ParserState::VALUE:
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						if (ch == '\n') state = ParserState::VALUE_CONTINUATION;
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						else value << ch;
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						break;
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					case ParserState::VALUE_CONTINUATION:
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						if (ch == '+') {
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							state = ParserState::VALUE;
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							if (value.tellp()) value << '\n';
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							if (input.get() != ' ') input.unget();
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						} else {
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							input.unget();
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							state = ParserState::START;
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							emitLogicalLine(type, name, value);
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						}
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						break;
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					case ParserState::COMMENT:
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						if (ch == '\n') {
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							state = ParserState::START;
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							emitLogicalLine(type, name, value);
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						} else {
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							value << ch;
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						}
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						break;
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					default:
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						throw RelpipeWriterException(L"Unknown ParserState: " + std::to_wstring((int) state) + L" in RecfileParser."); // TODO: better exception
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				}
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			}
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			emitLogicalLine(type, name, value);
0
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		}
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	};
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public:
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	void process(std::istream& input, std::ostream& output) {
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		unique_ptr<RelationalWriter> writer(Factory::create(output));
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		RecfileHandler handler(writer.get());
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		RecfileParser parser(handler);
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		parser.parse(input);
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	}
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};
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}
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}
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}