1 /** |
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2 * Relational pipes |
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3 * Copyright © 2018 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, either version 3 of the License, or |
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8 * (at your option) any later version. |
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9 * |
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10 * This program is distributed in the hope that it will be useful, |
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 * GNU General Public License for more details. |
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14 * |
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15 * You should have received a copy of the GNU General Public License |
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16 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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17 */ |
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18 #pragma once |
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19 |
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20 #include <cstdlib> |
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21 #include <iostream> |
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22 #include <string> |
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23 #include <vector> |
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24 #include <algorithm> |
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25 #include <string> |
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26 #include <locale> |
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27 |
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28 #include <relpipe/writer/typedefs.h> |
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29 #include <relpipe/writer/AttributeMetadata.h> |
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30 #include <relpipe/cli/CLI.h> |
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31 #include <relpipe/cli/RelpipeCLIException.h> |
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32 |
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33 #include "Command.h" |
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34 |
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35 namespace relpipe { |
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36 namespace in { |
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37 namespace cli { |
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38 |
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39 /** |
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40 * TODO: consider code merge with ArgumentsCommand |
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41 */ |
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42 class StdInCommand : public Command { |
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43 private: |
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44 relpipe::writer::boolean_t readStdIn; |
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45 std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings. |
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46 |
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47 /** |
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48 * Reads next value from arguments and (if no arguments left) from input |
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49 * @param input |
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50 * @param arguments |
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51 * @param i current index in the arguments vector |
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52 * @param required if true, exception is thrown when no data found |
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53 * @return |
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54 */ |
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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) { |
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56 using namespace relpipe::writer; |
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57 using namespace relpipe::cli; |
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58 |
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59 if (i < arguments.size()) { |
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60 return arguments[i++]; |
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61 } else if (readStdIn) { |
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62 std::stringstream value; |
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63 |
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64 while (true) { |
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65 char ch; |
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66 input.get(ch); |
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67 if (ch == 0 || input.eof() || input.fail()) break; |
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68 else value << ch; |
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69 } |
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70 |
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71 if (required && value.str().empty()) throw RelpipeCLIException(L"Missing value on STDIN.", CLI::EXIT_CODE_BAD_SYNTAX); |
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72 |
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73 return convertor.from_bytes(value.str()); |
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74 } else { |
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75 if (required) throw RelpipeCLIException(L"Missing value on CLI.", CLI::EXIT_CODE_BAD_SYNTAX); |
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76 return L""; |
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77 } |
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78 } |
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79 |
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80 |
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81 public: |
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82 |
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83 StdInCommand(relpipe::writer::boolean_t readStdIn) : |
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84 readStdIn(readStdIn) { |
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85 } |
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86 |
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87 void process(std::istream& input, std::ostream& output, const relpipe::writer::string_t& command, const std::vector<relpipe::writer::string_t>& arguments) override { |
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88 using namespace relpipe::writer; |
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89 |
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90 size_t i = 0; |
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91 string_t relationName = readNext(input, arguments, i, true); |
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92 integer_t attributeCount = std::stoul(readNext(input, arguments, i, true)); // TODO: use integer data type's method? |
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93 boolean_t writeHeader = true; // TODO: add option for header omitting |
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94 |
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95 std::shared_ptr<RelationalWriter> writer(Factory::create(output)); |
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96 |
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97 std::vector<AttributeMetadata> attributes(attributeCount); |
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98 |
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99 for (size_t j = 0; j < attributeCount; j++) { |
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100 string_t attributeName = readNext(input, arguments, i, true); |
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101 TypeId attributeType = writer->toTypeId(readNext(input, arguments, i, true)); |
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102 attributes[j] = {attributeName, attributeType}; |
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103 } |
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104 |
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105 writer->startRelation(relationName, attributes, writeHeader); |
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106 |
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107 while (true) { |
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108 string_t value = readNext(input, arguments, i, false); |
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109 if (value.empty() && (input.eof() || input.fail() || (!readStdIn && i >= arguments.size()))) break; |
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110 else writer->writeAttribute(value); |
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111 // TODO: check attribute count (avoid unfinished records) |
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112 } |
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113 } |
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114 }; |
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115 |
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116 } |
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117 } |
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118 } |
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