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116 lines
3.5 KiB
C++
116 lines
3.5 KiB
C++
// Tencent is pleased to support the open source community by making RapidJSON available.
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//
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// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
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//
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// Licensed under the MIT License (the "License"); you may not use this file except
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// in compliance with the License. You may obtain a copy of the License at
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//
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// http://opensource.org/licenses/MIT
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//
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// Unless required by applicable law or agreed to in writing, software distributed
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// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations under the License.
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#ifndef RAPIDJSON_ISTREAMWRAPPER_H_
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#define RAPIDJSON_ISTREAMWRAPPER_H_
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#include "stream.h"
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#include <iosfwd>
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#ifdef __clang__
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RAPIDJSON_DIAG_PUSH
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RAPIDJSON_DIAG_OFF(padded)
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#endif
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#ifdef _MSC_VER
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RAPIDJSON_DIAG_PUSH
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RAPIDJSON_DIAG_OFF(4351) // new behavior: elements of array 'array' will be default initialized
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#endif
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RAPIDJSON_NAMESPACE_BEGIN
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//! Wrapper of \c std::basic_istream into RapidJSON's Stream concept.
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/*!
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The classes can be wrapped including but not limited to:
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- \c std::istringstream
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- \c std::stringstream
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- \c std::wistringstream
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- \c std::wstringstream
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- \c std::ifstream
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- \c std::fstream
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- \c std::wifstream
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- \c std::wfstream
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\tparam StreamType Class derived from \c std::basic_istream.
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*/
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template <typename StreamType>
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class BasicIStreamWrapper {
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public:
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typedef typename StreamType::char_type Ch;
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BasicIStreamWrapper(StreamType& stream) : stream_(stream), count_(), peekBuffer_() {}
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Ch Peek() const {
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typename StreamType::int_type c = stream_.peek();
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return RAPIDJSON_LIKELY(c != StreamType::traits_type::eof()) ? static_cast<Ch>(c) : '\0';
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}
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Ch Take() {
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typename StreamType::int_type c = stream_.get();
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if (RAPIDJSON_LIKELY(c != StreamType::traits_type::eof())) {
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count_++;
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return static_cast<Ch>(c);
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}
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else
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return '\0';
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}
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// tellg() may return -1 when failed. So we count by ourself.
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size_t Tell() const { return count_; }
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Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
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void Put(Ch) { RAPIDJSON_ASSERT(false); }
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void Flush() { RAPIDJSON_ASSERT(false); }
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size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }
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// For encoding detection only.
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const Ch* Peek4() const {
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RAPIDJSON_ASSERT(sizeof(Ch) == 1); // Only usable for byte stream.
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int i;
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bool hasError = false;
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for (i = 0; i < 4; ++i) {
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typename StreamType::int_type c = stream_.get();
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if (c == StreamType::traits_type::eof()) {
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hasError = true;
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stream_.clear();
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break;
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}
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peekBuffer_[i] = static_cast<Ch>(c);
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}
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for (--i; i >= 0; --i)
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stream_.putback(peekBuffer_[i]);
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return !hasError ? peekBuffer_ : 0;
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}
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private:
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BasicIStreamWrapper(const BasicIStreamWrapper&);
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BasicIStreamWrapper& operator=(const BasicIStreamWrapper&);
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StreamType& stream_;
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size_t count_; //!< Number of characters read. Note:
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mutable Ch peekBuffer_[4];
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};
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typedef BasicIStreamWrapper<std::istream> IStreamWrapper;
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typedef BasicIStreamWrapper<std::wistream> WIStreamWrapper;
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#if defined(__clang__) || defined(_MSC_VER)
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RAPIDJSON_DIAG_POP
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#endif
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RAPIDJSON_NAMESPACE_END
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#endif // RAPIDJSON_ISTREAMWRAPPER_H_
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