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83 lines
2.7 KiB
C++
83 lines
2.7 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.
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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_INTERNAL_STRFUNC_H_
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#define RAPIDJSON_INTERNAL_STRFUNC_H_
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#include "../stream.h"
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#include <cwchar>
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RAPIDJSON_NAMESPACE_BEGIN
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namespace internal {
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//! Custom strlen() which works on different character types.
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/*! \tparam Ch Character type (e.g. char, wchar_t, short)
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\param s Null-terminated input string.
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\return Number of characters in the string.
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\note This has the same semantics as strlen(), the return value is not number of Unicode codepoints.
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*/
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template <typename Ch>
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inline SizeType StrLen(const Ch* s) {
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RAPIDJSON_ASSERT(s != 0);
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const Ch* p = s;
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while (*p) ++p;
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return SizeType(p - s);
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}
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template <>
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inline SizeType StrLen(const char* s) {
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return SizeType(std::strlen(s));
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}
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template <>
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inline SizeType StrLen(const wchar_t* s) {
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return SizeType(std::wcslen(s));
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}
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//! Custom strcmpn() which works on different character types.
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/*! \tparam Ch Character type (e.g. char, wchar_t, short)
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\param s1 Null-terminated input string.
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\param s2 Null-terminated input string.
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\return 0 if equal
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*/
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template<typename Ch>
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inline int StrCmp(const Ch* s1, const Ch* s2) {
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RAPIDJSON_ASSERT(s1 != 0);
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RAPIDJSON_ASSERT(s2 != 0);
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while(*s1 && (*s1 == *s2)) { s1++; s2++; }
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return static_cast<unsigned>(*s1) < static_cast<unsigned>(*s2) ? -1 : static_cast<unsigned>(*s1) > static_cast<unsigned>(*s2);
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}
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//! Returns number of code points in a encoded string.
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template<typename Encoding>
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bool CountStringCodePoint(const typename Encoding::Ch* s, SizeType length, SizeType* outCount) {
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RAPIDJSON_ASSERT(s != 0);
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RAPIDJSON_ASSERT(outCount != 0);
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GenericStringStream<Encoding> is(s);
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const typename Encoding::Ch* end = s + length;
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SizeType count = 0;
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while (is.src_ < end) {
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unsigned codepoint;
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if (!Encoding::Decode(is, &codepoint))
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return false;
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count++;
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}
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*outCount = count;
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return true;
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}
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} // namespace internal
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RAPIDJSON_NAMESPACE_END
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#endif // RAPIDJSON_INTERNAL_STRFUNC_H_
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