/**
* 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 <cstdlib>
#include <iostream>
#include <memory>
#include <vector>
#include <yaml.h>
#include <relpipe/writer/RelationalWriter.h>
#include <relpipe/writer/typedefs.h>
namespace relpipe {
namespace in {
namespace yaml {
class YAMLCommand {
private:
std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
class YAMLEvent {
private:
yaml_event_t event;
public:
YAMLEvent(yaml_event_t event) : event(event) {
}
virtual ~YAMLEvent() {
yaml_event_delete(&event);
}
const yaml_event_type_t getType() const {
return event.type;
}
const yaml_event_t* getEvent() const {
return &event;
}
YAMLEvent(const YAMLEvent&) = delete;
YAMLEvent& operator=(const YAMLEvent&) = delete;
};
class YAMLParser {
private:
yaml_parser_t yamlParser;
std::istream* input = nullptr;
static int readFromInput(void* instance, unsigned char* buffer, size_t size, size_t* length) {
std::istream* input = ((YAMLParser*) instance)->input;
input->read((char*) buffer, size);
*length = input->gcount();
return (input->good() || input->eof()) ? 1 : 0;
}
public:
YAMLParser() {
yaml_parser_initialize(&yamlParser);
}
virtual ~YAMLParser() {
yaml_parser_delete(&yamlParser);
}
YAMLParser(const YAMLParser&) = delete;
YAMLParser& operator=(const YAMLParser&) = delete;
void setInput(std::istream* input) {
this->input = input;
yaml_parser_set_input(&yamlParser, readFromInput, (void*) this);
}
YAMLEvent* next() {
yaml_event_t event;
int result = yaml_parser_parse(&yamlParser, &event);
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
}
};
YAMLParser parser;
using YAMLEvent_p = std::shared_ptr<YAMLEvent>;
enum class Mode {
ROOT,
RELATIONS_SEQUENCE,
MAPPING,
MAP_KEY
};
std::vector<Mode> mode;
/**
* Both YAML and XML strings are in UTF-8.
*/
const char* y2x(yaml_char_t* value) {
return value ? (const char*) value : "";
}
public:
YAMLCommand() {
}
virtual ~YAMLCommand() {
}
void process(std::istream& input, std::shared_ptr<relpipe::writer::RelationalWriter> writer) {
parser.setInput(&input);
std::vector<relpipe::writer::AttributeMetadata> attributesMetadata;
attributesMetadata.push_back(relpipe::writer::AttributeMetadata{L"todo", relpipe::writer::TypeId::STRING});
writer->startRelation(L"YAML", attributesMetadata, true);
mode.push_back(Mode::ROOT);
std::string itemName;
writer->writeAttribute(L"before cycle");
for (YAMLEvent_p event = YAMLEvent_p(parser.next()); event; event = YAMLEvent_p(parser.next())) {
if (event->getType() == YAML_NO_EVENT) { writer->writeAttribute(L"YAML_NO_EVENT");
} else if (event->getType() == YAML_STREAM_START_EVENT) { writer->writeAttribute(L"YAML_STREAM_START_EVENT");
} else if (event->getType() == YAML_STREAM_END_EVENT) { writer->writeAttribute(L"YAML_STREAM_END_EVENT");
} else if (event->getType() == YAML_DOCUMENT_START_EVENT) { writer->writeAttribute(L"YAML_DOCUMENT_START_EVENT");
} else if (event->getType() == YAML_DOCUMENT_END_EVENT) { writer->writeAttribute(L"YAML_DOCUMENT_END_EVENT");
} else if (event->getType() == YAML_ALIAS_EVENT) { writer->writeAttribute(L"YAML_ALIAS_EVENT");
} else if (event->getType() == YAML_SCALAR_EVENT) { writer->writeAttribute(L"YAML_SCALAR_EVENT");
} else if (event->getType() == YAML_SEQUENCE_START_EVENT) { writer->writeAttribute(L"YAML_SEQUENCE_START_EVENT");
} else if (event->getType() == YAML_SEQUENCE_END_EVENT) { writer->writeAttribute(L"YAML_SEQUENCE_END_EVENT");
} else if (event->getType() == YAML_MAPPING_START_EVENT) { writer->writeAttribute(L"YAML_MAPPING_START_EVENT");
} else if (event->getType() == YAML_MAPPING_END_EVENT) { writer->writeAttribute(L"YAML_MAPPING_END_EVENT");
} else { writer->writeAttribute(L"else???");
// TODO: unsupported type?
}
}
writer->writeAttribute(L"after cycle");
}
};
}
}
}