char-predicates-inl.h

Go to the documentation of this file.

// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       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
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef V8_CHAR_PREDICATES_INL_H_
#define V8_CHAR_PREDICATES_INL_H_

#include "char-predicates.h"

namespace v8 {
namespace internal {


// If c is in 'A'-'Z' or 'a'-'z', return its lower-case.
// Else, return something outside of 'A'-'Z' and 'a'-'z'.
// Note: it ignores LOCALE.
inline int AsciiAlphaToLower(uc32 c) {
  return c | 0x20;
}


inline bool IsCarriageReturn(uc32 c) {
  return c == 0x000D;
}


inline bool IsLineFeed(uc32 c) {
  return c == 0x000A;
}


inline bool IsInRange(int value, int lower_limit, int higher_limit) {
  ASSERT(lower_limit <= higher_limit);
  return static_cast<unsigned int>(value - lower_limit) <=
      static_cast<unsigned int>(higher_limit - lower_limit);
}


inline bool IsDecimalDigit(uc32 c) {
  // ECMA-262, 3rd, 7.8.3 (p 16)
  return IsInRange(c, '0', '9');
}


inline bool IsHexDigit(uc32 c) {
  // ECMA-262, 3rd, 7.6 (p 15)
  return IsDecimalDigit(c) || IsInRange(AsciiAlphaToLower(c), 'a', 'f');
}


inline bool IsRegExpWord(uc16 c) {
  return IsInRange(AsciiAlphaToLower(c), 'a', 'z')
      || IsDecimalDigit(c)
      || (c == '_');
}


inline bool IsRegExpNewline(uc16 c) {
  switch (c) {
    //   CR           LF           LS           PS
    case 0x000A: case 0x000D: case 0x2028: case 0x2029:
      return false;
    default:
      return true;
  }
}


} }  // namespace v8::internal

#endif  // V8_CHAR_PREDICATES_INL_H_