xpcom/ds/CharTokenizer.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef mozilla_CharTokenizer_h
   7 #define mozilla_CharTokenizer_h
   8
   9 #include "nsDependentSubstring.h"
  10
  11 namespace mozilla {
  12
  13 template<PRUnichar delimiter>
  14 class CharTokenizer
  15 {
  16 public:
  17     CharTokenizer(const nsSubstring& aSource)
  18     {
  19       aSource.BeginReading(mIter);
  20       aSource.EndReading(mEnd);
  21     }
  22
  23     /**
  24      * Checks if any more tokens are available.
  25      */
  26     bool hasMoreTokens()
  27     {
  28       return mIter != mEnd;
  29     }
  30
  31     /**
  32      * Returns the next token.
  33      */
  34     const nsDependentSubstring nextToken()
  35     {
  36       nsSubstring::const_char_iterator begin = mIter;
  37       while (mIter != mEnd && (*mIter) != delimiter) {
  38         ++mIter;
  39       }
  40       nsSubstring::const_char_iterator end = mIter;
  41       if (mIter != mEnd) {
  42         ++mIter;
  43       }
  44
  45       return Substring(begin, end);
  46     }
  47
  48 private:
  49     nsSubstring::const_char_iterator mIter, mEnd;
  50 };
  51
  52 template<char delimiter>
  53 class CCharTokenizer
  54 {
  55 public:
  56     CCharTokenizer(const nsCSubstring& aSource)
  57     {
  58       aSource.BeginReading(mIter);
  59       aSource.EndReading(mEnd);
  60     }
  61
  62     /**
  63      * Checks if any more tokens are available.
  64      */
  65     bool hasMoreTokens()
  66     {
  67       return mIter != mEnd;
  68     }
  69
  70     /**
  71      * Returns the next token.
  72      */
  73     const nsDependentCSubstring nextToken()
  74     {
  75       nsCSubstring::const_char_iterator begin = mIter;
  76       while (mIter != mEnd && (*mIter) != delimiter) {
  77         ++mIter;
  78       }
  79       nsCSubstring::const_char_iterator end = mIter;
  80       if (mIter != mEnd) {
  81         ++mIter;
  82       }
  83
  84       return Substring(begin, end);
  85     }
  86
  87 private:
  88     nsCSubstring::const_char_iterator mIter, mEnd;
  89 };
  90
  91 } // namespace mozilla
  92
  93 #endif /* mozilla_CharTokenizer_h */