src/YAMLCommand.h
author František Kučera <franta-hg@frantovo.cz>
Thu, 03 Dec 2020 17:16:09 +0100
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OOP wrapper for yaml.h + list event types
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/**
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 * Relational pipes
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 * Copyright © 2020 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, version 3 of the License.
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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 <cstdlib>
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#include <iostream>
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#include <memory>
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#include <vector>
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#include <yaml.h>
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#include <relpipe/writer/RelationalWriter.h>
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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 yaml {
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class YAMLCommand {
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private:
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	std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
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	class YAMLEvent {
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	private:
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		yaml_event_t event;
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	public:
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		YAMLEvent(yaml_event_t event) : event(event) {
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		}
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		virtual ~YAMLEvent() {
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			yaml_event_delete(&event);
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		}
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		const yaml_event_type_t getType() const {
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			return event.type;
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		}
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		const yaml_event_t* getEvent() const {
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			return &event;
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		}
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		YAMLEvent(const YAMLEvent&) = delete;
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		YAMLEvent& operator=(const YAMLEvent&) = delete;
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	};
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	class YAMLParser {
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	private:
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		yaml_parser_t yamlParser;
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		std::istream* input = nullptr;
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		static int readFromInput(void* instance, unsigned char* buffer, size_t size, size_t* length) {
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			std::istream* input = ((YAMLParser*) instance)->input;
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			input->read((char*) buffer, size);
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			*length = input->gcount();
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			return (input->good() || input->eof()) ? 1 : 0;
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		}
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	public:
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		YAMLParser() {
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			yaml_parser_initialize(&yamlParser);
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		}
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		virtual ~YAMLParser() {
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			yaml_parser_delete(&yamlParser);
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		}
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		YAMLParser(const YAMLParser&) = delete;
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		YAMLParser& operator=(const YAMLParser&) = delete;
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		void setInput(std::istream* input) {
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			this->input = input;
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			yaml_parser_set_input(&yamlParser, readFromInput, (void*) this);
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		}
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		YAMLEvent* next() {
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			yaml_event_t event;
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			int result = yaml_parser_parse(&yamlParser, &event);
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			return result == 1 && event.type != yaml_event_type_e::YAML_NO_EVENT ? new YAMLEvent(event) : nullptr; // 1 = OK in yaml.h; YAML_NO_EVENT = end
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		}
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	};
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	YAMLParser parser;
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	using YAMLEvent_p = std::shared_ptr<YAMLEvent>;
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	enum class Mode {
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		ROOT,
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		RELATIONS_SEQUENCE,
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		MAPPING,
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		MAP_KEY
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	};
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	std::vector<Mode> mode;
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	/**
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	 * Both YAML and XML strings are in UTF-8.
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	 */
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	const char* y2x(yaml_char_t* value) {
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		return value ? (const char*) value : "";
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	}
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	YAMLCommand() {
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	}
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	virtual ~YAMLCommand() {
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	}
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	void process(std::istream& input, std::shared_ptr<relpipe::writer::RelationalWriter> writer) {
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		parser.setInput(&input);
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		std::vector<relpipe::writer::AttributeMetadata> attributesMetadata;
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		attributesMetadata.push_back(relpipe::writer::AttributeMetadata{L"todo", relpipe::writer::TypeId::STRING});
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		writer->startRelation(L"YAML", attributesMetadata, true);
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		mode.push_back(Mode::ROOT);
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		std::string itemName;
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		writer->writeAttribute(L"before cycle");
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		for (YAMLEvent_p event = YAMLEvent_p(parser.next()); event; event = YAMLEvent_p(parser.next())) {
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			if (event->getType() == YAML_NO_EVENT) { writer->writeAttribute(L"YAML_NO_EVENT");
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			} else if (event->getType() == YAML_STREAM_START_EVENT) { writer->writeAttribute(L"YAML_STREAM_START_EVENT");
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			} else if (event->getType() == YAML_STREAM_END_EVENT) { writer->writeAttribute(L"YAML_STREAM_END_EVENT");
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			} else if (event->getType() == YAML_DOCUMENT_START_EVENT) { writer->writeAttribute(L"YAML_DOCUMENT_START_EVENT");
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			} else if (event->getType() == YAML_DOCUMENT_END_EVENT) { writer->writeAttribute(L"YAML_DOCUMENT_END_EVENT");
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			} else if (event->getType() == YAML_ALIAS_EVENT) { writer->writeAttribute(L"YAML_ALIAS_EVENT");
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			} else if (event->getType() == YAML_SCALAR_EVENT) { writer->writeAttribute(L"YAML_SCALAR_EVENT");
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			} else if (event->getType() == YAML_SEQUENCE_START_EVENT) { writer->writeAttribute(L"YAML_SEQUENCE_START_EVENT");
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			} else if (event->getType() == YAML_SEQUENCE_END_EVENT) { writer->writeAttribute(L"YAML_SEQUENCE_END_EVENT");
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			} else if (event->getType() == YAML_MAPPING_START_EVENT) { writer->writeAttribute(L"YAML_MAPPING_START_EVENT");
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			} else if (event->getType() == YAML_MAPPING_END_EVENT) { writer->writeAttribute(L"YAML_MAPPING_END_EVENT");
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			} else { writer->writeAttribute(L"else???");
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				// TODO: unsupported type?
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			}
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		}
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		writer->writeAttribute(L"after cycle");
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	}
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};
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}
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}
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}