trim.h
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1 /*
2  * Copyright (C) 2010 Tommi Maekitalo
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * As a special exception, you may use this file as part of a free
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11  * instantiate templates or use macros or inline functions from this
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17  * General Public License.
18  *
19  * This library is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22  * Lesser General Public License for more details.
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27  */
28 
29 #ifndef CXXTOOLS_TRIM_H
30 #define CXXTOOLS_TRIM_H
31 
32 #include <string>
33 
34 namespace cxxtools
35 {
36  template <typename StringType>
37  StringType ltrim(const StringType& s, const StringType& ws = StringType(" \t\r\n"))
38  {
39  typename StringType::size_type p = s.find_first_not_of(ws);
40  return p == StringType::npos ? StringType() : s.substr(p);
41  }
42 
43  template <typename StringType>
44  StringType rtrim(const StringType& s, const StringType& ws = StringType(" \t\r\n"))
45  {
46  typename StringType::size_type p = s.find_last_not_of(ws);
47  return p == StringType::npos ? StringType() : s.substr(0, p + 1);
48  }
49 
50  template <typename StringType>
51  StringType trim(const StringType& s, const StringType& ws = StringType(" \t\r\n"))
52  {
53  typename StringType::size_type pl = s.find_first_not_of(ws);
54 
55  if (pl == StringType::npos)
56  return StringType();
57 
58  typename StringType::size_type pr = s.find_last_not_of(ws);
59 
60  return s.substr(pl, pr - pl + 1);
61  }
62 
63 }
64 
65 #endif // CXXTOOLS_TRIM_H