third_party/WebKit/Source/platform/wtf/text/ParsingUtilities.h

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 */

#ifndef ParsingUtilities_h
#define ParsingUtilities_h

namespace WTF {

template <typename CharType>
bool SkipExactly(const CharType*& position,
                 const CharType* end,
                 CharType delimiter) {
  if (position < end && *position == delimiter) {
    ++position;
    return true;
  }
  return false;
}

template <typename CharType, bool characterPredicate(CharType)>
bool SkipExactly(const CharType*& position, const CharType* end) {
  if (position < end && characterPredicate(*position)) {
    ++position;
    return true;
  }
  return false;
}

template <typename CharType>
bool SkipToken(const CharType*& position,
               const CharType* end,
               const char* token) {
  const CharType* current = position;
  while (current < end && *token) {
    if (*current != *token)
      return false;
    ++current;
    ++token;
  }
  if (*token)
    return false;

  position = current;
  return true;
}

template <typename CharType>
void SkipUntil(const CharType*& position,
               const CharType* end,
               CharType delimiter) {
  while (position < end && *position != delimiter)
    ++position;
}

template <typename CharType, bool characterPredicate(CharType)>
void SkipUntil(const CharType*& position, const CharType* end) {
  while (position < end && !characterPredicate(*position))
    ++position;
}

template <typename CharType, bool characterPredicate(CharType)>
void SkipWhile(const CharType*& position, const CharType* end) {
  while (position < end && characterPredicate(*position))
    ++position;
}

template <typename CharType, bool characterPredicate(CharType)>
void ReverseSkipWhile(const CharType*& position, const CharType* start) {
  while (position >= start && characterPredicate(*position))
    --position;
}

}  // namespace WTF

using WTF::SkipExactly;
using WTF::SkipToken;
using WTF::SkipUntil;
using WTF::SkipWhile;
using WTF::ReverseSkipWhile;

#endif  // ParsingUtilities_h