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1 /** |
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2 * Relational pipes |
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3 * Copyright © 2021 František Kučera (Frantovo.cz, GlobalCode.info) |
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4 * |
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5 * This program is free software: you can redistribute it and/or modify |
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6 * it under the terms of the GNU General Public License as published by |
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7 * the Free Software Foundation, version 3 of the License. |
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8 * |
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9 * This program is distributed in the hope that it will be useful, |
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 * GNU General Public License for more details. |
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13 * |
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14 * You should have received a copy of the GNU General Public License |
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15 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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16 */ |
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17 #pragma once |
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18 |
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19 #include <memory> |
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20 #include <string> |
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21 #include <vector> |
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22 #include <iostream> |
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23 #include <sstream> |
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24 #include <locale> |
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25 #include <codecvt> |
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26 #include <stdexcept> |
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27 |
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28 #include <relpipe/reader/typedefs.h> |
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29 #include <relpipe/reader/TypeId.h> |
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30 #include <relpipe/reader/handlers/RelationalReaderStringHandler.h> |
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31 #include <relpipe/reader/handlers/AttributeMetadata.h> |
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32 |
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33 #include "Configuration.h" |
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34 |
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35 namespace relpipe { |
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36 namespace out { |
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37 namespace x11 { |
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38 |
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39 using namespace relpipe; |
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40 using namespace relpipe::reader; |
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41 using namespace relpipe::reader::handlers; |
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42 |
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43 class X11Handler : public RelationalReaderStringHandler { |
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44 private: |
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45 std::ostream& output; |
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46 Configuration& configuration; |
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47 const char QUOTE = '"'; |
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48 std::wstring_convert<std::codecvt_utf8<wchar_t>> convertor; // TODO: probably not needed |
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49 std::vector<AttributeMetadata> firstAttributes; |
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50 integer_t valueCount = 0; |
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51 public: |
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52 |
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53 X11Handler(std::ostream& output, Configuration& configuration) : output(output), configuration(configuration) { |
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54 } |
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55 |
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56 void startRelation(string_t name, std::vector<AttributeMetadata> attributes) override { |
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57 if (firstAttributes.empty()) { |
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58 firstAttributes = attributes; |
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59 if (configuration.writeHeader) for (auto attr : attributes) attribute(attr.getAttributeName()); |
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60 } else { |
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61 throw std::logic_error("Only a single relation can be converted to the X11 format."); |
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62 } |
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63 } |
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64 |
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65 void attribute(const string_t& value) override { |
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66 valueCount++; |
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67 |
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68 if (value.size() > 0) { |
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69 output << QUOTE; |
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70 for (auto ch : convertor.to_bytes(value)) { |
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71 if (ch == QUOTE) output << QUOTE << QUOTE; |
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72 else output << ch; |
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73 } |
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74 output << QUOTE; |
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75 } |
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76 |
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77 if (valueCount % firstAttributes.size()) { |
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78 output << ","; |
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79 } else { |
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80 output << "\r\n"; |
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81 valueCount = 0; |
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82 } |
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83 } |
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84 |
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85 void endOfPipe() { |
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86 output.flush(); |
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87 } |
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88 |
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89 }; |
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90 |
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91 } |
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92 } |
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93 } |