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 
IsAsciiIdentifier(uc32 c)38 inline bool IsAsciiIdentifier(uc32 c) {
39   return IsAlphaNumeric(c) || c == '$' || c == '_';
40 }
41 
IsAlphaNumeric(uc32 c)42 inline bool IsAlphaNumeric(uc32 c) {
43   return IsInRange(AsciiAlphaToLower(c), 'a', 'z') || IsDecimalDigit(c);
44 }
45 
IsDecimalDigit(uc32 c)46 inline bool IsDecimalDigit(uc32 c) {
47   // ECMA-262, 3rd, 7.8.3 (p 16)
48   return IsInRange(c, '0', '9');
49 }
50 
51 
IsHexDigit(uc32 c)52 inline bool IsHexDigit(uc32 c) {
53   // ECMA-262, 3rd, 7.6 (p 15)
54   return IsDecimalDigit(c) || IsInRange(AsciiAlphaToLower(c), 'a', 'f');
55 }
56 
57 
IsOctalDigit(uc32 c)58 inline bool IsOctalDigit(uc32 c) {
59   // ECMA-262, 6th, 7.8.3
60   return IsInRange(c, '0', '7');
61 }
62 
63 
IsBinaryDigit(uc32 c)64 inline bool IsBinaryDigit(uc32 c) {
65   // ECMA-262, 6th, 7.8.3
66   return c == '0' || c == '1';
67 }
68 
69 
IsRegExpWord(uc16 c)70 inline bool IsRegExpWord(uc16 c) {
71   return IsInRange(AsciiAlphaToLower(c), 'a', 'z')
72       || IsDecimalDigit(c)
73       || (c == '_');
74 }
75 
76 
IsRegExpNewline(uc16 c)77 inline bool IsRegExpNewline(uc16 c) {
78   switch (c) {
79     //   CR           LF           LS           PS
80     case 0x000A: case 0x000D: case 0x2028: case 0x2029:
81       return false;
82     default:
83       return true;
84   }
85 }
86 
87 
88 }  // namespace internal
89 }  // namespace v8
90 
91 #endif  // V8_CHAR_PREDICATES_INL_H_
92