convert YAML to relations
Expected structure is:
map:
key = relation name
value = sequence of maps (records) where:
key = attribute name
value = attribute value
Example:
--------
fruit:
- id: 1
name: cherry
- id: 2
name: apple
- id: 3
name: plum
empty:
# this relation has no attributes and will be ignored
sparse:
- a: aaa
b: bbb
c: ccc
- a: AAA
b: BBB
- c: C
d: D
e: E
a: A
f: F
- c: CCC
--------
Not yet supported:
--------
my_relation_with_metadata:
attribute-metadata:
- name: a
type: string
- name: b
type: boolean
record:
- a: a
- b: true
--------
/**
* 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/>.
*/
#include <cstdlib>
#include <fstream>
#include <memory>
#include <relpipe/writer/RelationalWriter.h>
#include <relpipe/writer/RelpipeWriterException.h>
#include <relpipe/writer/Factory.h>
#include <relpipe/writer/TypeId.h>
#include <relpipe/cli/CLI.h>
#include "YAMLCommand.h"
using namespace relpipe::cli;
using namespace relpipe::writer;
using namespace relpipe::in::yaml;
int main(int argc, char** argv) {
setlocale(LC_ALL, "");
CLI::untieStdIO();
CLI cli(argc, argv);
int resultCode = CLI::EXIT_CODE_UNEXPECTED_ERROR;
try {
YAMLCommand command;
std::shared_ptr<RelationalWriter> writer(Factory::create(std::cout));
command.process(cin, writer);
resultCode = CLI::EXIT_CODE_SUCCESS;
} catch (RelpipeWriterException& e) {
fwprintf(stderr, L"Caught Writer exception: %ls\n", e.getMessge().c_str());
fwprintf(stderr, L"Debug: Input stream: eof=%ls, lastRead=%d\n", (cin.eof() ? L"true" : L"false"), cin.gcount());
resultCode = CLI::EXIT_CODE_DATA_ERROR;
}
return resultCode;
}