author | František Kučera <franta-hg@frantovo.cz> |
Thu, 03 Dec 2020 22:31:03 +0100 | |
branch | v_0 |
changeset 2 | d68192f0e960 |
parent 1 | 8d2d8f4077af |
child 3 | 64f8f8792470 |
permissions | -rw-r--r-- |
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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; // YAML strings are in UTF-8 |
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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 State { |
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START, |
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RELATIONS, |
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ATTRIBUTE, |
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RECORDS |
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}; |
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State state; |
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relpipe::writer::string_t y2s(yaml_char_t* value) { |
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return value ? convertor.from_bytes((const char*) value) : L""; |
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} |
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relpipe::writer::string_t findValue(std::vector<relpipe::writer::string_t> record, relpipe::writer::string_t key) { |
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if (record.size() % 2) relpipe::writer::RelpipeWriterException(L"Invalid count of values in the record vector"); |
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for (size_t i = 0; i < record.size(); i += 2) { |
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if (record[i] == key) return record[i + 1]; |
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} |
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return L""; |
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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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relpipe::writer::string_t relationName; |
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std::vector<relpipe::writer::string_t> record; |
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std::vector<relpipe::writer::AttributeMetadata> attributesMetadata; |
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state = State::START; |
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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) { |
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141 |
throw relpipe::writer::RelpipeWriterException(L"Invalid YAML structure: YAML_NO_EVENT"); |
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142 |
} else if (event->getType() == YAML_STREAM_START_EVENT) { |
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143 |
} else if (event->getType() == YAML_STREAM_END_EVENT) { |
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144 |
} else if (event->getType() == YAML_DOCUMENT_START_EVENT) { |
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145 |
} else if (event->getType() == YAML_DOCUMENT_END_EVENT) { |
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146 |
} else if (event->getType() == YAML_ALIAS_EVENT) { |
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147 |
} else if (event->getType() == YAML_SCALAR_EVENT) { |
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148 |
relpipe::writer::string_t scalarValue = y2s(event->getEvent()->data.scalar.value); |
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149 |
if (state == State::RELATIONS) relationName = scalarValue; |
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150 |
else if (state == State::ATTRIBUTE) record.push_back(scalarValue); |
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151 |
else throw relpipe::writer::RelpipeWriterException(L"Invalid YAML structure: unexpected YAML_SCALAR_EVENT"); |
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152 |
} else if (event->getType() == YAML_SEQUENCE_START_EVENT) { |
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153 |
if (state == State::RELATIONS) state = State::RECORDS; |
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154 |
else throw relpipe::writer::RelpipeWriterException(L"Invalid YAML structure: unexpected YAML_SEQUENCE_START_EVENT"); |
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155 |
} else if (event->getType() == YAML_SEQUENCE_END_EVENT) { |
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156 |
if (state == State::RECORDS) { |
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157 |
state = State::RELATIONS; |
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158 |
relationName.clear(); |
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159 |
attributesMetadata.clear(); |
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160 |
} else { |
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161 |
throw relpipe::writer::RelpipeWriterException(L"Invalid YAML structure: unexpected YAML_SEQUENCE_END_EVENT"); |
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162 |
} |
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163 |
} else if (event->getType() == YAML_MAPPING_START_EVENT) { |
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164 |
if (state == State::START) state = State::RELATIONS; |
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165 |
else if (state == State::RECORDS) state = State::ATTRIBUTE; |
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166 |
else if (state == State::RELATIONS) throw relpipe::writer::RelpipeWriterException(L"Not yet implemented"); // TODO: there might be also a map in the relation value (not only a sequence) that would contain metadata (i.e. data types + support for relation containing no records) |
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167 |
else throw relpipe::writer::RelpipeWriterException(L"Invalid YAML structure: unexpected YAML_MAPPING_START_EVENT"); |
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168 |
} else if (event->getType() == YAML_MAPPING_END_EVENT) { |
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169 |
if (state == State::ATTRIBUTE) { |
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170 |
if (attributesMetadata.size() == 0) { |
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171 |
if (record.size() % 2) relpipe::writer::RelpipeWriterException(L"Invalid count of values in the record vector"); |
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172 |
for (size_t i = 0; i < record.size(); i += 2) attributesMetadata.push_back(relpipe::writer::AttributeMetadata{record[i], relpipe::writer::TypeId::STRING}); |
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173 |
writer->startRelation(relationName, attributesMetadata, true); |
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174 |
} |
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175 |
for (auto m : attributesMetadata) writer->writeAttribute(findValue(record, m.attributeName)); |
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176 |
record.clear(); |
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177 |
state = State::RECORDS; |
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178 |
} else if (state == State::RELATIONS) { |
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179 |
break; // map of the relations ends (root) |
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180 |
} else { |
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181 |
throw relpipe::writer::RelpipeWriterException(L"Invalid YAML structure: unexpected YAML_MAPPING_END_EVENT"); |
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182 |
} |
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183 |
} else { |
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184 |
throw relpipe::writer::RelpipeWriterException(L"Invalid YAML structure: unknown event: " + std::to_wstring(event->getType())); |
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185 |
} |
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186 |
} |
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} |
188 |
}; |
|
189 |
||
190 |
} |
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191 |
} |
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192 |
} |