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1 /** |
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2 * Relational pipes |
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3 * Copyright © 2020 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 <sstream> |
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20 |
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21 #include "UnescapingINIHandler.h" |
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22 |
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23 using namespace std; |
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24 using namespace relpipe::writer; |
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25 |
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26 namespace relpipe { |
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27 namespace in { |
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28 namespace ini { |
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29 namespace lib { |
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30 |
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31 class BasicUnescapingINIContentHandler : public UnescapingINIContentHandler { |
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32 protected: |
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33 |
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34 virtual std::string unescape(const std::string& s) { |
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35 std::stringstream result; |
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36 for (int i = 0, length = s.size(); i < length; i++) { |
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37 char ch = s[i]; |
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38 if (i + 1 < length && ch == ESC) { |
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39 ch = s[i + 1]; |
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40 if (ch == 'n') put(result, '\n', i); |
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41 else if (ch == 'r') put(result, '\r', i); |
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42 else if (ch == 't') put(result, '\t', i); |
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43 else if (ch == 's') put(result, ' ', i); // TODO: Reconsider what is „basic“ escaping and should be supported. |
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44 else if (ch == '"') put(result, ch, i); // The delimiters (\n,]",') are already unescaped during the first stage in the INIReader while parsing (the delimiter relevant to given environment is unescaped, e.g. \" in "quoted" value). |
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45 else if (ch == '\'') put(result, ch, i); // So it does not necessary to do it here. But someone might write a="xxx\'zzz" however it is superfluous because a="xxx'zzz" will also work. |
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46 else if (ch == ']') put(result, ch, i); |
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47 else if (ch == ':') put(result, ch, i); |
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48 else if (ch == ';') put(result, ch, i); |
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49 else if (ch == '#') put(result, ch, i); |
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50 else if (ch == '=') put(result, ch, i); |
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51 else if (ch == ESC && !lastEscaphingPhase) put(result, ESC, i).put(ESC); // copy and skip even the second \ to avoid its misinterpretation in the next cycle |
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52 else if (ch == ESC && lastEscaphingPhase) put(result, ESC, i); // unescape \\ to \. |
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53 else if (lastEscaphingPhase) throw std::logic_error(std::string("Unsupported escape sequence: ") + ch); |
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54 else result.put(ESC); // keep the escape sequence for later unescaping phase |
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55 } else if (ch == ESC) { |
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56 throw std::logic_error(std::string("Missing escape sequence")); // this should not happen |
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57 } else { |
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58 result.put(ch); |
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59 } |
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60 } |
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61 return result.str(); |
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62 } |
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63 |
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64 public: |
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65 |
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66 BasicUnescapingINIContentHandler(INIContentHandler& output, bool lastEscaphingPhase) : UnescapingINIContentHandler(output, lastEscaphingPhase) { |
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67 } |
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68 |
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69 }; |
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70 |
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71 } |
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72 } |
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73 } |
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74 } |