1 // Copyright 2011 the V8 project authors. All rights reserved.
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3 // modification, are permitted provided that the following conditions are
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5 //
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27
28 #ifndef V8_CHAR_PREDICATES_INL_H_
29 #define V8_CHAR_PREDICATES_INL_H_
30
31 #include "char-predicates.h"
32
33 namespace v8 {
34 namespace internal {
35
36
37 // If c is in 'A'-'Z' or 'a'-'z', return its lower-case.
38 // Else, return something outside of 'A'-'Z' and 'a'-'z'.
39 // Note: it ignores LOCALE.
AsciiAlphaToLower(uc32 c)40 inline int AsciiAlphaToLower(uc32 c) {
41 return c | 0x20;
42 }
43
44
IsCarriageReturn(uc32 c)45 inline bool IsCarriageReturn(uc32 c) {
46 return c == 0x000D;
47 }
48
49
IsLineFeed(uc32 c)50 inline bool IsLineFeed(uc32 c) {
51 return c == 0x000A;
52 }
53
54
IsInRange(int value,int lower_limit,int higher_limit)55 inline bool IsInRange(int value, int lower_limit, int higher_limit) {
56 ASSERT(lower_limit <= higher_limit);
57 return static_cast<unsigned int>(value - lower_limit) <=
58 static_cast<unsigned int>(higher_limit - lower_limit);
59 }
60
61
IsDecimalDigit(uc32 c)62 inline bool IsDecimalDigit(uc32 c) {
63 // ECMA-262, 3rd, 7.8.3 (p 16)
64 return IsInRange(c, '0', '9');
65 }
66
67
IsHexDigit(uc32 c)68 inline bool IsHexDigit(uc32 c) {
69 // ECMA-262, 3rd, 7.6 (p 15)
70 return IsDecimalDigit(c) || IsInRange(AsciiAlphaToLower(c), 'a', 'f');
71 }
72
73
IsRegExpWord(uc16 c)74 inline bool IsRegExpWord(uc16 c) {
75 return IsInRange(AsciiAlphaToLower(c), 'a', 'z')
76 || IsDecimalDigit(c)
77 || (c == '_');
78 }
79
80
IsRegExpNewline(uc16 c)81 inline bool IsRegExpNewline(uc16 c) {
82 switch (c) {
83 // CR LF LS PS
84 case 0x000A: case 0x000D: case 0x2028: case 0x2029:
85 return false;
86 default:
87 return true;
88 }
89 }
90
91
92 } } // namespace v8::internal
93
94 #endif // V8_CHAR_PREDICATES_INL_H_
95