third_party/WebKit/Source/platform/ParsingUtilities.h

   1 /*
   2  * Copyright (C) 2013 Google Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  *     * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  * copyright notice, this list of conditions and the following disclaimer
  12  * in the documentation and/or other materials provided with the
  13  * distribution.
  14  *     * Neither the name of Google Inc. nor the names of its
  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #ifndef ParsingUtilities_h
  32 #define ParsingUtilities_h
  33
  34 template<typename CharType>
  35 bool skipExactly(const CharType*& position, const CharType* end, CharType delimiter)
  36 {
  37     if (position < end && *position == delimiter) {
  38         ++position;
  39         return true;
  40     }
  41     return false;
  42 }
  43
  44 template<typename CharType, bool characterPredicate(CharType)>
  45 bool skipExactly(const CharType*& position, const CharType* end)
  46 {
  47     if (position < end && characterPredicate(*position)) {
  48         ++position;
  49         return true;
  50     }
  51     return false;
  52 }
  53
  54 template <typename CharType>
  55 bool skipToken(const CharType*& position, const CharType* end, const char* token)
  56 {
  57     const CharType* current = position;
  58     while (current < end && *token) {
  59         if (*current != *token)
  60             return false;
  61         ++current;
  62         ++token;
  63     }
  64     if (*token)
  65         return false;
  66
  67     position = current;
  68     return true;
  69 }
  70
  71 template <typename CharType>
  72 void skipUntil(const CharType*& position, const CharType* end, CharType delimiter)
  73 {
  74     while (position < end && *position != delimiter)
  75         ++position;
  76 }
  77
  78 template<typename CharType, bool characterPredicate(CharType)>
  79 void skipUntil(const CharType*& position, const CharType* end)
  80 {
  81     while (position < end && !characterPredicate(*position))
  82         ++position;
  83 }
  84
  85 template<typename CharType, bool characterPredicate(CharType)>
  86 void skipWhile(const CharType*& position, const CharType* end)
  87 {
  88     while (position < end && characterPredicate(*position))
  89         ++position;
  90 }
  91
  92 template<typename CharType, bool characterPredicate(CharType)>
  93 void reverseSkipWhile(const CharType*& position, const CharType* start)
  94 {
  95     while (position >= start && characterPredicate(*position))
  96         --position;
  97 }
  98
  99 #endif
 100