text: // Copyright 2011 the V8 project authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef V8_CHAR_PREDICATES_H_
  #define V8_CHAR_PREDICATES_H_
  
  #include "src/unicode.h"
  
  namespace v8 {
  namespace internal {
  
  // Unicode character predicates as defined by ECMA-262, 3rd,
  // used for lexical analysis.
  
  inline bool IsCarriageReturn(uc32 c);
  inline bool IsLineFeed(uc32 c);
  inline bool IsDecimalDigit(uc32 c);
  inline bool IsHexDigit(uc32 c);
  inline bool IsOctalDigit(uc32 c);
  inline bool IsBinaryDigit(uc32 c);
  inline bool IsRegExpWord(uc32 c);
  inline bool IsRegExpNewline(uc32 c);
  
  struct IdentifierStart {
    static inline bool Is(uc32 c) {
      switch (c) {
        case '$': case '_': case '\\': return true;
        default: return unibrow::Letter::Is(c);
      }
    }
  };
  
  
  struct IdentifierPart {
    static inline bool Is(uc32 c) {
      return IdentifierStart::Is(c)
          || unibrow::Number::Is(c)
          || c == 0x200C  // U+200C is Zero-Width Non-Joiner.
          || c == 0x200D  // U+200D is Zero-Width Joiner.
          || unibrow::CombiningMark::Is(c)
          || unibrow::ConnectorPunctuation::Is(c);
    }
  };
  
  
  // WhiteSpace according to ECMA-262 5.1, 7.2.
  struct WhiteSpace {
    static inline bool Is(uc32 c) {
      return c == 0x0009 ||  // <TAB>
             c == 0x000B ||  // <VT>
             c == 0x000C ||  // <FF>
             c == 0xFEFF ||  // <BOM>
             // \u0020 and \u00A0 are included in unibrow::WhiteSpace.
             unibrow::WhiteSpace::Is(c);
    }
  };
  
  
  // WhiteSpace and LineTerminator according to ECMA-262 5.1, 7.2 and 7.3.
  struct WhiteSpaceOrLineTerminator {
    static inline bool Is(uc32 c) {
      return WhiteSpace::Is(c) || unibrow::LineTerminator::Is(c);
    }
  };
  
  } }  // namespace v8::internal
  
  #endif  // V8_CHAR_PREDICATES_H_
  