| Directory: | ./ |
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| File: | pdcom5/src/msrproto/expat_wrapper_impl.h |
| Date: | 2023-11-12 04:06:57 |
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| Lines: | 34 | 37 | 91.9% |
| Branches: | 15 | 30 | 50.0% |
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| 1 | /***************************************************************************** | ||
| 2 | * | ||
| 3 | * Copyright (C) 2021 Bjarne von Horn (vh at igh dot de) | ||
| 4 | * | ||
| 5 | * This file is part of the PdCom library. | ||
| 6 | * | ||
| 7 | * The PdCom library is free software: you can redistribute it and/or modify | ||
| 8 | * it under the terms of the GNU Lesser General Public License as published by | ||
| 9 | * the Free Software Foundation, either version 3 of the License, or (at your | ||
| 10 | * option) any later version. | ||
| 11 | * | ||
| 12 | * The PdCom library is distributed in the hope that it will be useful, but | ||
| 13 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | ||
| 14 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public | ||
| 15 | * License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public License | ||
| 18 | * along with the PdCom library. If not, see <http://www.gnu.org/licenses/>. | ||
| 19 | * | ||
| 20 | *****************************************************************************/ | ||
| 21 | |||
| 22 | #ifndef MSRPROTO_EXPAT_WRAPPER_IMPL_H | ||
| 23 | #define MSRPROTO_EXPAT_WRAPPER_IMPL_H | ||
| 24 | |||
| 25 | #include "expat_wrapper.h" | ||
| 26 | |||
| 27 | #include <expat.h> | ||
| 28 | #include <expat_external.h> | ||
| 29 | #include <pdcom5/Exception.h> | ||
| 30 | #include <stdexcept> | ||
| 31 | |||
| 32 | namespace PdCom { namespace impl { namespace MsrProto { | ||
| 33 | 131 | inline void XmlParserDeleter::operator()(XML_ParserStruct *s) noexcept | |
| 34 | { | ||
| 35 |
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131 | if (s) |
| 36 | 131 | XML_ParserFree(s); | |
| 37 | 131 | } | |
| 38 | |||
| 39 | |||
| 40 | template <typename Handler> | ||
| 41 | struct ExpatWrapper<Handler>::CallbackWrapper | ||
| 42 | { | ||
| 43 | // TODO(ighvh): use template<auto> when C++17 is mandatory (so in about 10 | ||
| 44 | // years) | ||
| 45 | template <typename T, T, int = 0> | ||
| 46 | struct Impl; | ||
| 47 | |||
| 48 | // We use a partial specialisation of the struct above | ||
| 49 | // to extract the argument types (Args) from the Member function. | ||
| 50 | template < | ||
| 51 | typename... Args, | ||
| 52 | void (Handler::*callback)(Args...), | ||
| 53 | int level_change> | ||
| 54 | struct Impl<void (Handler::*)(Args...), callback, level_change> | ||
| 55 | { | ||
| 56 | 2998 | static void XMLCALL call(void *userdata, Args... args) | |
| 57 | { | ||
| 58 | 2998 | auto &This = *reinterpret_cast<ExpatWrapper<Handler> *>(userdata); | |
| 59 | // increment (start handler only) | ||
| 60 | 2998 | This.level_ += level_change == 1; | |
| 61 |
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2998 | if (This.pending_exception_) |
| 62 | 1 | return; | |
| 63 | try { | ||
| 64 |
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2997 | (static_cast<Handler &>(This).*callback)(args...); |
| 65 | } | ||
| 66 | 2 | catch (...) { | |
| 67 | 1 | This.pending_exception_ = std::current_exception(); | |
| 68 |
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1 | XML_StopParser(This.parser_.get(), false); |
| 69 | } | ||
| 70 | // decrement (end handler only) | ||
| 71 | 2997 | This.level_ -= level_change == -1; | |
| 72 | } | ||
| 73 | }; | ||
| 74 | }; | ||
| 75 | |||
| 76 | template <typename Handler> | ||
| 77 | 132 | inline ExpatWrapper<Handler>::ExpatWrapper(const char *encoding) | |
| 78 | { | ||
| 79 |
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132 | reset(encoding); |
| 80 | 132 | } | |
| 81 | |||
| 82 | template <typename Handler> | ||
| 83 | 132 | inline void ExpatWrapper<Handler>::reset(const char *encoding) | |
| 84 | { | ||
| 85 | 132 | pending_exception_ = nullptr; | |
| 86 | 132 | level_ = 0; | |
| 87 | 132 | parser_.reset(XML_ParserCreate(encoding)); | |
| 88 |
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132 | if (!parser_) |
| 89 | ✗ | throw PdCom::Exception("Could not create XML parser"); | |
| 90 | |||
| 91 | using W1 = typename CallbackWrapper::template Impl< | ||
| 92 | decltype(&Handler::startElement), &Handler::startElement, 1>; | ||
| 93 | using W2 = typename CallbackWrapper::template Impl< | ||
| 94 | decltype(&Handler::endElement), &Handler::endElement, -1>; | ||
| 95 | |||
| 96 | 132 | XML_SetUserData(parser_.get(), this); | |
| 97 | 132 | XML_SetStartElementHandler(parser_.get(), &W1::call); | |
| 98 | 132 | XML_SetEndElementHandler(parser_.get(), &W2::call); | |
| 99 | 132 | } | |
| 100 | |||
| 101 | template <typename Handler> | ||
| 102 | inline bool | ||
| 103 | 858 | ExpatWrapper<Handler>::parse(const char *s, std::size_t n, bool final) | |
| 104 | { | ||
| 105 |
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858 | if (XML_STATUS_OK == XML_Parse(parser_.get(), s, n, final)) |
| 106 | 857 | return true; | |
| 107 | |||
| 108 | 1 | const XML_Error err_code = XML_GetErrorCode(parser_.get()); | |
| 109 |
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1 | if (err_code == XML_ERROR_ABORTED && pending_exception_) { |
| 110 | 2 | auto pe = pending_exception_; | |
| 111 | 1 | pending_exception_ = nullptr; | |
| 112 | 2 | std::rethrow_exception(pe); | |
| 113 | } | ||
| 114 | |||
| 115 | ✗ | static_cast<Handler *>(this)->xmlError(XML_ErrorString(err_code)); | |
| 116 | ✗ | return false; | |
| 117 | } | ||
| 118 | |||
| 119 | }}} // namespace PdCom::impl::MsrProto | ||
| 120 | |||
| 121 | #endif // MSRPROTO_EXPAT_WRAPPER_H | ||
| 122 |