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, version 3 of the License.

     8  *

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

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

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

    12  * GNU General Public License for more details.

    13  *

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

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

    16  */

    17 #pragma once

    18 

    19 #include <cstdlib>

    20 #include <iostream>

    21 #include <string>

    22 #include <vector>

    23 #include <algorithm>

    24 #include <string>

    25 #include <locale>

    26 

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

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

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

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

    31 

    32 #include "Command.h"

    33 

    34 namespace relpipe {

    35 namespace in {

    36 namespace cli {

    37 

    38 /**

    39  * TODO: consider code merge with ArgumentsCommand

    40  */

    41 class StdInCommand : public Command {

    42 private:

    43 	relpipe::writer::boolean_t readStdIn;

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

    45 

    46 	/**

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

    48 	 * @param input

    49 	 * @param arguments

    50 	 * @param i current index in the arguments vector

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

    52 	 * @return 

    53 	 */

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

    55 		using namespace relpipe::writer;

    56 		using namespace relpipe::cli;

    57 

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

    59 			return arguments[i++];

    60 		} else if (readStdIn) {

    61 			std::stringstream value;

    62 

    63 			while (true) {

    64 				char ch;

    65 				input.get(ch);

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

    67 				else value << ch;

    68 			}

    69 

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

    71 

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

    73 		} else {

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

    75 			return L"";

    76 		}

    77 	}

    78 

    79 

    80 public:

    81 

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

    83 	readStdIn(readStdIn) {

    84 	}

    85 

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

    87 		using namespace relpipe::writer;

    88 

    89 		size_t i = 0;

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

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

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

    93 

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

    95 

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

    97 

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

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

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

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

   102 		}

   103 

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

   105 

   106 		while (true) {

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

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

   109 			else writer->writeAttribute(value);

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

   111 		}

   112 	}

   113 };

   114 

   115 }

   116 }

   117 }