1 /**

     2  * Relational pipes

     3  * Copyright © 2018 František Kučera (Frantovo.cz, GlobalCode.info)

     4  *

     5  * This program is free software: you can redistribute it and/or modify

     6  * it under the terms of the GNU General Public License as published by

     7  * the Free Software Foundation, either version 3 of the License, or

     8  * (at your option) any later version.

     9  *

    10  * This program is distributed in the hope that it will be useful,

    11  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

    13  * GNU General Public License for more details.

    14  *

    15  * You should have received a copy of the GNU General Public License

    16  * along with this program. If not, see <http://www.gnu.org/licenses/>.

    17  */

    18 #pragma once

    19 

    20 #include <cstdlib>

    21 #include <iostream>

    22 #include <string>

    23 #include <vector>

    24 #include <algorithm>

    25 #include <string>

    26 #include <locale>

    27 

    28 #include <relpipe/writer/typedefs.h>

    29 #include <relpipe/writer/AttributeMetadata.h>

    30 #include <relpipe/cli/CLI.h>

    31 #include <relpipe/cli/RelpipeCLIException.h>

    32 

    33 #include "Command.h"

    34 

    35 namespace relpipe {

    36 namespace in {

    37 namespace cli {

    38 

    39 /**

    40  * TODO: consider code merge with ArgumentsCommand

    41  */

    42 class StdInCommand : public Command {

    43 private:

    44 	relpipe::writer::boolean_t readStdIn;

    45 	std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.

    46 

    47 	/**

    48 	 * Reads next value from arguments and (if no arguments left) from input

    49 	 * @param input

    50 	 * @param arguments

    51 	 * @param i current index in the arguments vector

    52 	 * @param required if true, exception is thrown when no data found

    53 	 * @return 

    54 	 */

    55 	relpipe::writer::string_t readNext(std::istream& input, const std::vector<relpipe::writer::string_t>& arguments, size_t& i, relpipe::writer::boolean_t required) {

    56 		using namespace relpipe::writer;

    57 		using namespace relpipe::cli;

    58 

    59 		if (i < arguments.size()) {

    60 			return arguments[i++];

    61 		} else if (readStdIn) {

    62 			std::stringstream value;

    63 

    64 			while (true) {

    65 				char ch;

    66 				input.get(ch);

    67 				if (ch == 0 || input.eof() || input.fail()) break;

    68 				else value << ch;

    69 			}

    70 

    71 			if (required && value.str().empty()) throw RelpipeCLIException(L"Missing value on STDIN.", CLI::EXIT_CODE_BAD_SYNTAX);

    72 

    73 			return convertor.from_bytes(value.str());

    74 		} else {

    75 			if (required) throw RelpipeCLIException(L"Missing value on CLI.", CLI::EXIT_CODE_BAD_SYNTAX);

    76 			return L"";

    77 		}

    78 	}

    79 

    80 

    81 public:

    82 

    83 	StdInCommand(relpipe::writer::boolean_t readStdIn) :

    84 	readStdIn(readStdIn) {

    85 	}

    86 

    87 	void process(std::istream& input, std::ostream& output, const relpipe::writer::string_t& command, const std::vector<relpipe::writer::string_t>& arguments) override {

    88 		using namespace relpipe::writer;

    89 

    90 		size_t i = 0;

    91 		string_t relationName = readNext(input, arguments, i, true);

    92 		integer_t attributeCount = std::stoul(readNext(input, arguments, i, true)); // TODO: use integer data type's method?

    93 		boolean_t writeHeader = true; // TODO: add option for header omitting

    94 

    95 		std::shared_ptr<RelationalWriter> writer(Factory::create(output));

    96 

    97 		std::vector<AttributeMetadata> attributes(attributeCount);

    98 

    99 		for (size_t j = 0; j < attributeCount; j++) {

   100 			string_t attributeName = readNext(input, arguments, i, true);

   101 			TypeId attributeType = writer->toTypeId(readNext(input, arguments, i, true));

   102 			attributes[j] = {attributeName, attributeType};

   103 		}

   104 

   105 		writer->startRelation(relationName, attributes, writeHeader);

   106 

   107 		while (true) {

   108 			string_t value = readNext(input, arguments, i, false);

   109 			if (value.empty() && (input.eof() || input.fail() || (!readStdIn && i >= arguments.size()))) break;

   110 			else writer->writeAttribute(value);

   111 			// TODO: check attribute count (avoid unfinished records)

   112 		}

   113 	}

   114 };

   115 

   116 }

   117 }

   118 }