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      1 // Copyright 2011 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef V8_CHAR_PREDICATES_H_
      6 #define V8_CHAR_PREDICATES_H_
      7 
      8 #include "src/globals.h"
      9 #include "src/unicode.h"
     10 
     11 namespace v8 {
     12 namespace internal {
     13 
     14 // Unicode character predicates as defined by ECMA-262, 3rd,
     15 // used for lexical analysis.
     16 
     17 inline int AsciiAlphaToLower(uc32 c);
     18 inline bool IsCarriageReturn(uc32 c);
     19 inline bool IsLineFeed(uc32 c);
     20 inline bool IsAsciiIdentifier(uc32 c);
     21 inline bool IsAlphaNumeric(uc32 c);
     22 inline bool IsDecimalDigit(uc32 c);
     23 inline bool IsHexDigit(uc32 c);
     24 inline bool IsOctalDigit(uc32 c);
     25 inline bool IsBinaryDigit(uc32 c);
     26 inline bool IsRegExpWord(uc32 c);
     27 inline bool IsRegExpNewline(uc32 c);
     28 
     29 // ES#sec-names-and-keywords
     30 // This includes '_', '$' and '\', and ID_Start according to
     31 // http://www.unicode.org/reports/tr31/, which consists of categories
     32 // 'Lu', 'Ll', 'Lt', 'Lm', 'Lo', 'Nl', but excluding properties
     33 // 'Pattern_Syntax' or 'Pattern_White_Space'.
     34 #ifdef V8_INTL_SUPPORT
     35 struct V8_EXPORT_PRIVATE IdentifierStart {
     36   static bool Is(uc32 c);
     37 #else
     38 struct IdentifierStart {
     39   // Non-BMP characters are not supported without I18N.
     40   static inline bool Is(uc32 c) {
     41     return (c <= 0xFFFF) ? unibrow::ID_Start::Is(c) : false;
     42   }
     43 #endif
     44 };
     45 
     46 // ES#sec-names-and-keywords
     47 // This includes \u200c and \u200d, and ID_Continue according to
     48 // http://www.unicode.org/reports/tr31/, which consists of ID_Start,
     49 // the categories 'Mn', 'Mc', 'Nd', 'Pc', but excluding properties
     50 // 'Pattern_Syntax' or 'Pattern_White_Space'.
     51 #ifdef V8_INTL_SUPPORT
     52 struct V8_EXPORT_PRIVATE IdentifierPart {
     53   static bool Is(uc32 c);
     54 #else
     55 struct IdentifierPart {
     56   static inline bool Is(uc32 c) {
     57     // Non-BMP charaacters are not supported without I18N.
     58     if (c <= 0xFFFF) {
     59       return unibrow::ID_Start::Is(c) || unibrow::ID_Continue::Is(c);
     60     }
     61     return false;
     62   }
     63 #endif
     64 };
     65 
     66 // ES6 draft section 11.2
     67 // This includes all code points of Unicode category 'Zs'.
     68 // Further included are \u0009, \u000b, \u000c, and \ufeff.
     69 #ifdef V8_INTL_SUPPORT
     70 struct V8_EXPORT_PRIVATE WhiteSpace {
     71   static bool Is(uc32 c);
     72 #else
     73 struct WhiteSpace {
     74   static inline bool Is(uc32 c) { return unibrow::WhiteSpace::Is(c); }
     75 #endif
     76 };
     77 
     78 // WhiteSpace and LineTerminator according to ES6 draft section 11.2 and 11.3
     79 // This includes all the characters with Unicode category 'Z' (= Zs+Zl+Zp)
     80 // as well as \u0009 - \u000d and \ufeff.
     81 struct WhiteSpaceOrLineTerminator {
     82   static inline bool Is(uc32 c) {
     83     return WhiteSpace::Is(c) || unibrow::IsLineTerminator(c);
     84   }
     85 };
     86 
     87 }  // namespace internal
     88 }  // namespace v8
     89 
     90 #endif  // V8_CHAR_PREDICATES_H_
     91