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_INL_H_
6 #define V8_CHAR_PREDICATES_INL_H_
7
8 #include "src/char-predicates.h"
9
10 namespace v8 {
11 namespace internal {
12
13
14 // If c is in 'A'-'Z' or 'a'-'z', return its lower-case.
15 // Else, return something outside of 'A'-'Z' and 'a'-'z'.
16 // Note: it ignores LOCALE.
AsciiAlphaToLower(uc32 c)17 inline int AsciiAlphaToLower(uc32 c) {
18 return c | 0x20;
19 }
20
21
IsCarriageReturn(uc32 c)22 inline bool IsCarriageReturn(uc32 c) {
23 return c == 0x000D;
24 }
25
26
IsLineFeed(uc32 c)27 inline bool IsLineFeed(uc32 c) {
28 return c == 0x000A;
29 }
30
31
IsInRange(int value,int lower_limit,int higher_limit)32 inline bool IsInRange(int value, int lower_limit, int higher_limit) {
33 DCHECK(lower_limit <= higher_limit);
34 return static_cast<unsigned int>(value - lower_limit) <=
35 static_cast<unsigned int>(higher_limit - lower_limit);
36 }
37
38
IsDecimalDigit(uc32 c)39 inline bool IsDecimalDigit(uc32 c) {
40 // ECMA-262, 3rd, 7.8.3 (p 16)
41 return IsInRange(c, '0', '9');
42 }
43
44
IsHexDigit(uc32 c)45 inline bool IsHexDigit(uc32 c) {
46 // ECMA-262, 3rd, 7.6 (p 15)
47 return IsDecimalDigit(c) || IsInRange(AsciiAlphaToLower(c), 'a', 'f');
48 }
49
50
IsOctalDigit(uc32 c)51 inline bool IsOctalDigit(uc32 c) {
52 // ECMA-262, 6th, 7.8.3
53 return IsInRange(c, '0', '7');
54 }
55
56
IsBinaryDigit(uc32 c)57 inline bool IsBinaryDigit(uc32 c) {
58 // ECMA-262, 6th, 7.8.3
59 return c == '0' || c == '1';
60 }
61
62
IsRegExpWord(uc16 c)63 inline bool IsRegExpWord(uc16 c) {
64 return IsInRange(AsciiAlphaToLower(c), 'a', 'z')
65 || IsDecimalDigit(c)
66 || (c == '_');
67 }
68
69
IsRegExpNewline(uc16 c)70 inline bool IsRegExpNewline(uc16 c) {
71 switch (c) {
72 // CR LF LS PS
73 case 0x000A: case 0x000D: case 0x2028: case 0x2029:
74 return false;
75 default:
76 return true;
77 }
78 }
79
80
81 } } // namespace v8::internal
82
83 #endif // V8_CHAR_PREDICATES_INL_H_
84