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 <memory>

    20 #include <string>

    21 #include <vector>

    22 #include <iostream>

    23 #include <sstream>

    24 #include <locale>

    25 #include <codecvt>

    26 

    27 #include <relpipe/common/type/typedefs.h>

    28 #include <relpipe/reader/TypeId.h>

    29 #include <relpipe/reader/handlers/RelationalReaderStringHandler.h>

    30 #include <relpipe/reader/handlers/AttributeMetadata.h>

    31 

    32 namespace relpipe {

    33 namespace out {

    34 namespace yaml {

    35 

    36 class YAMLHandler : public relpipe::reader::handlers::RelationalReaderStringHandler {

    37 private:

    38 	std::ostream& output;

    39 	std::wstring_convert<std::codecvt_utf8<wchar_t>> convertor; // we generate YAML always in UTF-8 like XML?

    40 	std::vector<relpipe::reader::handlers::AttributeMetadata> currentAttributes;

    41 	size_t currentAttributeIndex = 0;

    42 

    43 	void writeYamlValue(const relpipe::common::type::StringX& value) {

    44 		// TODO: escaping

    45 		output << convertor.to_bytes(value);

    46 	}

    47 public:

    48 

    49 	YAMLHandler(std::ostream& output) : output(output) {

    50 	}

    51 

    52 	void startRelation(relpipe::common::type::StringX name, std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) override {

    53 		currentAttributes = attributes;

    54 	}

    55 

    56 	void attribute(const relpipe::common::type::StringX& value) override {

    57 		if (currentAttributeIndex % currentAttributes.size() == 0) {

    58 			currentAttributeIndex = 0;

    59 			

    60 		} else {

    61 			

    62 		}

    63 

    64 		currentAttributeIndex++;

    65 	}

    66 

    67 	void endOfPipe() {

    68 		output.flush();

    69 	}

    70 

    71 };

    72 

    73 }

    74 }

    75 }