/**
* Relational pipes
* Copyright © 2018 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 <string>
#include <vector>
#include <algorithm>
#include <string>
#include <locale>
#include <relpipe/writer/typedefs.h>
#include <relpipe/writer/AttributeMetadata.h>
#include <relpipe/cli/CLI.h>
#include <relpipe/cli/RelpipeCLIException.h>
#include "Command.h"
namespace relpipe {
namespace in {
namespace cli {
/**
* TODO: consider code merge with ArgumentsCommand
*/
class StdInCommand : public Command {
private:
relpipe::writer::boolean_t readStdIn;
std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
/**
* Reads next value from arguments and (if no arguments left) from input
* @param input
* @param arguments
* @param i current index in the arguments vector
* @param required if true, exception is thrown when no data found
* @return
*/
relpipe::writer::string_t readNext(std::istream& input, const std::vector<relpipe::writer::string_t>& arguments, size_t& i, relpipe::writer::boolean_t required) {
using namespace relpipe::writer;
using namespace relpipe::cli;
if (i < arguments.size()) {
return arguments[i++];
} else if (readStdIn) {
std::stringstream value;
while (true) {
char ch;
input.get(ch);
if (ch == 0 || input.eof() || input.fail()) break;
else value << ch;
}
if (required && value.str().empty()) throw RelpipeCLIException(L"Missing value on STDIN.", CLI::EXIT_CODE_BAD_SYNTAX);
return convertor.from_bytes(value.str());
} else {
if (required) throw RelpipeCLIException(L"Missing value on CLI.", CLI::EXIT_CODE_BAD_SYNTAX);
return L"";
}
}
public:
StdInCommand(relpipe::writer::boolean_t readStdIn) :
readStdIn(readStdIn) {
}
void process(std::istream& input, std::ostream& output, const relpipe::writer::string_t& command, const std::vector<relpipe::writer::string_t>& arguments) override {
using namespace relpipe::writer;
size_t i = 0;
string_t relationName = readNext(input, arguments, i, true);
integer_t attributeCount = std::stoul(readNext(input, arguments, i, true)); // TODO: use integer data type's method?
boolean_t writeHeader = true; // TODO: add option for header omitting
std::shared_ptr<RelationalWriter> writer(Factory::create(output));
std::vector<AttributeMetadata> attributes(attributeCount);
for (size_t j = 0; j < attributeCount; j++) {
string_t attributeName = readNext(input, arguments, i, true);
TypeId attributeType = writer->toTypeId(readNext(input, arguments, i, true));
attributes[j] = {attributeName, attributeType};
}
writer->startRelation(relationName, attributes, writeHeader);
while (true) {
string_t value = readNext(input, arguments, i, false);
if (value.empty() && (input.eof() || input.fail() || (!readStdIn && i >= arguments.size()))) break;
else writer->writeAttribute(value);
// TODO: check attribute count (avoid unfinished records)
}
}
};
}
}
}