cursorstreamwrapper.h
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1 // Tencent is pleased to support the open source community by making RapidJSON available.
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3 // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
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5 // Licensed under the MIT License (the "License"); you may not use this file except
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14 
15 #ifndef RAPIDJSON_CURSORSTREAMWRAPPER_H_
16 #define RAPIDJSON_CURSORSTREAMWRAPPER_H_
17 
18 #include "stream.h"
19 
20 #if defined(__GNUC__)
21 RAPIDJSON_DIAG_PUSH
22 RAPIDJSON_DIAG_OFF(effc++)
23 #endif
24 
25 #if defined(_MSC_VER) && _MSC_VER <= 1800
26 RAPIDJSON_DIAG_PUSH
27 RAPIDJSON_DIAG_OFF(4702) // unreachable code
28 RAPIDJSON_DIAG_OFF(4512) // assignment operator could not be generated
29 #endif
30 
32 
33 
34 //! Cursor stream wrapper for counting line and column number if error exists.
35 /*!
36  \tparam InputStream Any stream that implements Stream Concept
37 */
38 template <typename InputStream, typename Encoding = UTF8<> >
39 class CursorStreamWrapper : public GenericStreamWrapper<InputStream, Encoding> {
40 public:
41  typedef typename Encoding::Ch Ch;
42 
43  CursorStreamWrapper(InputStream& is):
44  GenericStreamWrapper<InputStream, Encoding>(is), line_(1), col_(0) {}
45 
46  // counting line and column number
47  Ch Take() {
48  Ch ch = this->is_.Take();
49  if(ch == '\n') {
50  line_ ++;
51  col_ = 0;
52  } else {
53  col_ ++;
54  }
55  return ch;
56  }
57 
58  //! Get the error line number, if error exists.
59  size_t GetLine() const { return line_; }
60  //! Get the error column number, if error exists.
61  size_t GetColumn() const { return col_; }
62 
63 private:
64  size_t line_; //!< Current Line
65  size_t col_; //!< Current Column
66 };
67 
68 #if defined(_MSC_VER) && _MSC_VER <= 1800
69 RAPIDJSON_DIAG_POP
70 #endif
71 
72 #if defined(__GNUC__)
73 RAPIDJSON_DIAG_POP
74 #endif
75 
77 
78 #endif // RAPIDJSON_CURSORSTREAMWRAPPER_H_
Cursor stream wrapper for counting line and column number if error exists.
CursorStreamWrapper(InputStream &is)
size_t line_
Current Line.
#define RAPIDJSON_NAMESPACE_END
provide custom rapidjson namespace (closing expression)
Definition: rapidjson.h:124
#define RAPIDJSON_NAMESPACE_BEGIN
provide custom rapidjson namespace (opening expression)
Definition: rapidjson.h:121
size_t GetLine() const
Get the error line number, if error exists.
A Stream Wrapper.
Definition: stream.h:119
size_t GetColumn() const
Get the error column number, if error exists.
InputStream & is_
Definition: stream.h:140
size_t col_
Current Column.