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strfunc.h
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1 // Tencent is pleased to support the open source community by making RapidJSON available.
2 //
3 // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip.
4 //
5 // Licensed under the MIT License (the "License"); you may not use this file except
6 // in compliance with the License. You may obtain a copy of the License at
7 //
8 // http://opensource.org/licenses/MIT
9 //
10 // Unless required by applicable law or agreed to in writing, software distributed
11 // under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
12 // CONDITIONS OF ANY KIND, either express or implied. See the License for the
13 // specific language governing permissions and limitations under the License.
14 
15 #ifndef RAPIDJSON_INTERNAL_STRFUNC_H_
16 #define RAPIDJSON_INTERNAL_STRFUNC_H_
17 
18 #include "../stream.h"
19 #include <cwchar>
20 
21 RAPIDJSON_NAMESPACE_BEGIN
22 namespace internal {
23 
25 
31 template <typename Ch>
32 inline SizeType StrLen(const Ch* s)
33 {
34  RAPIDJSON_ASSERT(s != 0);
35  const Ch* p = s;
36  while(*p)
37  ++p;
38  return SizeType(p - s);
39 }
40 
41 template <>
42 inline SizeType StrLen(const char* s)
43 {
44  return SizeType(std::strlen(s));
45 }
46 
47 template <>
48 inline SizeType StrLen(const wchar_t* s)
49 {
50  return SizeType(std::wcslen(s));
51 }
52 
54 
59 template <typename Ch>
60 inline int StrCmp(const Ch* s1, const Ch* s2)
61 {
62  RAPIDJSON_ASSERT(s1 != 0);
63  RAPIDJSON_ASSERT(s2 != 0);
64  while(*s1 && (*s1 == *s2))
65  {
66  s1++;
67  s2++;
68  }
69  return static_cast<unsigned>(*s1) < static_cast<unsigned>(*s2)
70  ? -1
71  : static_cast<unsigned>(*s1) > static_cast<unsigned>(*s2);
72 }
73 
75 template <typename Encoding>
76 bool CountStringCodePoint(const typename Encoding::Ch* s, SizeType length, SizeType* outCount)
77 {
78  RAPIDJSON_ASSERT(s != 0);
79  RAPIDJSON_ASSERT(outCount != 0);
80  GenericStringStream<Encoding> is(s);
81  const typename Encoding::Ch* end = s + length;
82  SizeType count = 0;
83  while(is.src_ < end)
84  {
85  unsigned codepoint;
86  if(!Encoding::Decode(is, &codepoint))
87  return false;
88  count++;
89  }
90  *outCount = count;
91  return true;
92 }
93 
94 } // namespace internal
95 RAPIDJSON_NAMESPACE_END
96 
97 #endif // RAPIDJSON_INTERNAL_STRFUNC_H_
RAPIDJSON_ASSERT
#define RAPIDJSON_ASSERT(x)
Assertion.
Definition: rapidjson.h:451
RAPIDJSON_NAMESPACE_BEGIN
#define RAPIDJSON_NAMESPACE_BEGIN
provide custom rapidjson namespace (opening expression)
Definition: rapidjson.h:121
RAPIDJSON_NAMESPACE_END
#define RAPIDJSON_NAMESPACE_END
provide custom rapidjson namespace (closing expression)
Definition: rapidjson.h:124
internal
Definition: allocators.h:459
internal::StrLen
SizeType StrLen(const Ch *s)
Custom strlen() which works on different character types.
Definition: strfunc.h:32
internal::CountStringCodePoint
bool CountStringCodePoint(const typename Encoding::Ch *s, SizeType length, SizeType *outCount)
Returns number of code points in a encoded string.
Definition: strfunc.h:76
internal::StrCmp
int StrCmp(const Ch *s1, const Ch *s2)
Custom strcmpn() which works on different character types.
Definition: strfunc.h:60
SizeType
RAPIDJSON_NAMESPACE_BEGIN typedef unsigned SizeType
Size type (for string lengths, array sizes, etc.)
Definition: rapidjson.h:429
GenericStringStream
Read-only string stream.
Definition: stream.h:163
GenericStringStream::src_
const Ch * src_
Current read position.
Definition: stream.h:185