author | František Kučera <franta-hg@frantovo.cz> |
Sat, 29 May 2021 21:49:37 +0200 | |
branch | v_0 |
changeset 28 | 8f1da1ce3ca5 |
parent 26 | 84ff7c97bfdc |
child 29 | 9254988f9382 |
permissions | -rw-r--r-- |
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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, 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 <codecvt> |
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#include <vector> |
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#include <libxml++-2.6/libxml++/libxml++.h> |
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#include <yaml.h> |
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#include "XMLNameCodec.h" |
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namespace relpipe { |
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namespace in { |
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namespace xmltable { |
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class XMLDocumentConstructor { |
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private: |
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std::istream* input = nullptr; |
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xmlpp::DomParser* parser = nullptr; |
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yaml_parser_t yamlParser; |
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XMLNameCodec nameCodec; |
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enum class Mode { |
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ROOT, |
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SEQUENCE, |
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MAPPING, |
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MAP_KEY |
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}; |
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std::string rootName = "yaml"; |
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xmlpp::Element* current; |
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std::vector<Mode> mode; |
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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 = ((XMLDocumentConstructor*) 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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/** |
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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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const Glib::ustring y2xname(yaml_char_t* value) { |
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return nameCodec.encode(y2x(value)); |
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} |
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xmlpp::Element* parentOrSelf(xmlpp::Element* current) { |
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return current->get_parent() == nullptr ? current : current->get_parent(); |
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} |
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public: |
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XMLDocumentConstructor(std::istream* input, xmlpp::DomParser* parser) : input(input), parser(parser) { |
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yaml_parser_initialize(&yamlParser); |
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yaml_parser_set_input(&yamlParser, readFromInput, (void*) this); |
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} |
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virtual ~XMLDocumentConstructor() { |
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yaml_parser_delete(&yamlParser); |
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} |
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void setOption(const std::string& uri, const std::string& value) { |
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if (uri == "root-name") rootName = value; |
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else throw std::invalid_argument(std::string("Invalid parser option: „") + uri + "“ with value: „" + value + "“"); |
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} |
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void process() { |
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current = parser->get_document()->create_root_node(rootName); |
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mode.push_back(Mode::ROOT); |
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std::string itemName; |
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while (true) { |
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yaml_event_t event; |
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if (!yaml_parser_parse(&yamlParser, &event)) { |
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// FIXME: throw exception |
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return; |
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} |
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if (event.type == YAML_STREAM_END_EVENT) { |
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yaml_event_delete(&event); |
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break; |
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} else if (event.type == YAML_STREAM_START_EVENT) { |
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} else if (event.type == YAML_NO_EVENT) { |
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current->add_child("null"); // TODO: null? |
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} else if (event.type == YAML_DOCUMENT_START_EVENT) { |
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} else if (event.type == YAML_DOCUMENT_END_EVENT) { |
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} else if (event.type == YAML_ALIAS_EVENT) { |
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// TODO: alias? |
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} else if (event.type == YAML_SCALAR_EVENT) { |
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if (mode.back() == Mode::SEQUENCE) { |
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current->add_child(itemName)->add_child_text(y2x(event.data.scalar.value)); |
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} else if (mode.back() == Mode::MAPPING) { |
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current = current->add_child(y2xname(event.data.scalar.value)); |
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mode.push_back(Mode::MAP_KEY); |
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} else if (mode.back() == Mode::MAP_KEY) { |
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current->add_child_text(y2x(event.data.scalar.value)); |
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current = parentOrSelf(current); |
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mode.pop_back(); |
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} else if (mode.back() == Mode::ROOT) { |
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current->add_child_text(y2x(event.data.scalar.value)); |
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} else { |
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// TODO: process YAML_SCALAR_EVENT |
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} |
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126 |
|
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} else if (event.type == YAML_SEQUENCE_START_EVENT) { |
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xmlpp::Element* parent = current->get_parent(); |
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if (parent) { |
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itemName = current->get_name(); |
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parent->remove_child(current); |
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current = parent; |
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} else { |
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itemName = "item"; |
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} |
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if (mode.back() == Mode::MAP_KEY) mode.pop_back(); |
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mode.push_back(Mode::SEQUENCE); |
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} else if (event.type == YAML_SEQUENCE_END_EVENT) { |
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mode.pop_back(); // TODO: assert sequence? |
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} else if (event.type == YAML_MAPPING_START_EVENT) { |
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141 |
|
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if (mode.back() == Mode::ROOT) { |
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} else if (mode.back() == Mode::SEQUENCE) { |
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current = current->add_child(itemName); |
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} else if (mode.back() == Mode::MAP_KEY) { |
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mode.pop_back(); |
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} else { |
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// TODO: map might be a key of another map → wrap/nest |
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149 |
} |
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150 |
|
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mode.push_back(Mode::MAPPING); |
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} else if (event.type == YAML_MAPPING_END_EVENT) { |
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current = parentOrSelf(current); |
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mode.pop_back(); // TODO: assert map? |
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155 |
} else { |
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// TODO: unsupported type? |
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157 |
} |
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158 |
|
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159 |
yaml_event_delete(&event); |
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160 |
} |
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161 |
|
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162 |
|
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163 |
} |
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164 |
}; |
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165 |
|
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166 |
} |
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167 |
} |
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168 |
} |