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1 /* | 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
2 * Copyright (C) 2007, 2008, 2009, 2011 Apple Inc. All rights reserved. | 2 // Use of this source code is governed by a BSD-style license that can be |
3 * | 3 // found in the LICENSE file. |
4 * Redistribution and use in source and binary forms, with or without | |
5 * modification, are permitted provided that the following conditions | |
6 * are met: | |
7 * | |
8 * 1. Redistributions of source code must retain the above copyright | |
9 * notice, this list of conditions and the following disclaimer. | |
10 * 2. Redistributions in binary form must reproduce the above copyright | |
11 * notice, this list of conditions and the following disclaimer in the | |
12 * documentation and/or other materials provided with the distribution. | |
13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of | |
14 * its contributors may be used to endorse or promote products derived | |
15 * from this software without specific prior written permission. | |
16 * | |
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY | |
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY | |
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 */ | |
28 | 4 |
29 #ifndef WTF_ASCIICType_h | 5 #include "platform/wtf/ASCIICType.h" |
30 #define WTF_ASCIICType_h | |
31 | 6 |
32 #include "wtf/Assertions.h" | 7 // The contents of this header was moved to platform/wtf as part of |
33 #include "wtf/text/Unicode.h" | 8 // WTF migration project. See the following post for details: |
34 | 9 // https://groups.google.com/a/chromium.org/d/msg/blink-dev/tLdAZCTlcAA/bYXVT8gY
CAAJ |
35 // The behavior of many of the functions in the <ctype.h> header is dependent | |
36 // on the current locale. But in the WebKit project, all uses of those functions | |
37 // are in code processing something that's not locale-specific. These | |
38 // equivalents for some of the <ctype.h> functions are named more explicitly, | |
39 // not dependent on the C library locale, and we should also optimize them as | |
40 // needed. | |
41 | |
42 // All functions return false or leave the character unchanged if passed a | |
43 // character that is outside the range 0-7F. So they can be used on Unicode | |
44 // strings or characters if the intent is to do processing only if the | |
45 // character is ASCII. | |
46 | |
47 namespace WTF { | |
48 | |
49 template <typename CharType> | |
50 inline bool isASCII(CharType c) { | |
51 return !(c & ~0x7F); | |
52 } | |
53 | |
54 template <typename CharType> | |
55 inline bool isASCIIAlpha(CharType c) { | |
56 return (c | 0x20) >= 'a' && (c | 0x20) <= 'z'; | |
57 } | |
58 | |
59 template <typename CharType> | |
60 inline bool isASCIIDigit(CharType c) { | |
61 return c >= '0' && c <= '9'; | |
62 } | |
63 | |
64 template <typename CharType> | |
65 inline bool isASCIIAlphanumeric(CharType c) { | |
66 return isASCIIDigit(c) || isASCIIAlpha(c); | |
67 } | |
68 | |
69 template <typename CharType> | |
70 inline bool isASCIIHexDigit(CharType c) { | |
71 return isASCIIDigit(c) || ((c | 0x20) >= 'a' && (c | 0x20) <= 'f'); | |
72 } | |
73 | |
74 template <typename CharType> | |
75 inline bool isASCIILower(CharType c) { | |
76 return c >= 'a' && c <= 'z'; | |
77 } | |
78 | |
79 template <typename CharType> | |
80 inline bool isASCIIOctalDigit(CharType c) { | |
81 return (c >= '0') & (c <= '7'); | |
82 } | |
83 | |
84 template <typename CharType> | |
85 inline bool isASCIIPrintable(CharType c) { | |
86 return c >= ' ' && c <= '~'; | |
87 } | |
88 | |
89 /* | |
90 Statistics from a run of Apple's page load test for callers of isASCIISpace: | |
91 | |
92 character count | |
93 --------- ----- | |
94 non-spaces 689383 | |
95 20 space 294720 | |
96 0A \n 89059 | |
97 09 \t 28320 | |
98 0D \r 0 | |
99 0C \f 0 | |
100 0B \v 0 | |
101 */ | |
102 template <typename CharType> | |
103 inline bool isASCIISpace(CharType c) { | |
104 return c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9)); | |
105 } | |
106 | |
107 template <typename CharType> | |
108 inline bool isASCIIUpper(CharType c) { | |
109 return c >= 'A' && c <= 'Z'; | |
110 } | |
111 | |
112 WTF_EXPORT extern const LChar ASCIICaseFoldTable[256]; | |
113 | |
114 template <typename CharType> | |
115 inline CharType toASCIILower(CharType c) { | |
116 return c | ((c >= 'A' && c <= 'Z') << 5); | |
117 } | |
118 | |
119 inline LChar toASCIILower(LChar c) { | |
120 return ASCIICaseFoldTable[c]; | |
121 } | |
122 | |
123 inline char toASCIILower(char c) { | |
124 return static_cast<char>(ASCIICaseFoldTable[static_cast<LChar>(c)]); | |
125 } | |
126 | |
127 template <typename CharType> | |
128 inline CharType toASCIIUpper(CharType c) { | |
129 return c & ~((c >= 'a' && c <= 'z') << 5); | |
130 } | |
131 | |
132 template <typename CharType> | |
133 inline int toASCIIHexValue(CharType c) { | |
134 DCHECK(isASCIIHexDigit(c)); | |
135 return c < 'A' ? c - '0' : (c - 'A' + 10) & 0xF; | |
136 } | |
137 | |
138 template <typename CharType> | |
139 inline int toASCIIHexValue(CharType upperValue, CharType lowerValue) { | |
140 DCHECK(isASCIIHexDigit(upperValue)); | |
141 DCHECK(isASCIIHexDigit(lowerValue)); | |
142 return ((toASCIIHexValue(upperValue) << 4) & 0xF0) | | |
143 toASCIIHexValue(lowerValue); | |
144 } | |
145 | |
146 inline char lowerNibbleToASCIIHexDigit(char c) { | |
147 char nibble = c & 0xF; | |
148 return nibble < 10 ? '0' + nibble : 'A' + nibble - 10; | |
149 } | |
150 | |
151 inline char upperNibbleToASCIIHexDigit(char c) { | |
152 char nibble = (c >> 4) & 0xF; | |
153 return nibble < 10 ? '0' + nibble : 'A' + nibble - 10; | |
154 } | |
155 | |
156 template <typename CharType> | |
157 inline bool isASCIIAlphaCaselessEqual(CharType cssCharacter, char character) { | |
158 // This function compares a (preferrably) constant ASCII | |
159 // lowercase letter to any input character. | |
160 DCHECK_GE(character, 'a'); | |
161 DCHECK_LE(character, 'z'); | |
162 return LIKELY((cssCharacter | 0x20) == character); | |
163 } | |
164 | |
165 } // namespace WTF | |
166 | |
167 using WTF::isASCII; | |
168 using WTF::isASCIIAlpha; | |
169 using WTF::isASCIIAlphanumeric; | |
170 using WTF::isASCIIDigit; | |
171 using WTF::isASCIIHexDigit; | |
172 using WTF::isASCIILower; | |
173 using WTF::isASCIIOctalDigit; | |
174 using WTF::isASCIIPrintable; | |
175 using WTF::isASCIISpace; | |
176 using WTF::isASCIIUpper; | |
177 using WTF::toASCIIHexValue; | |
178 using WTF::toASCIILower; | |
179 using WTF::toASCIIUpper; | |
180 using WTF::lowerNibbleToASCIIHexDigit; | |
181 using WTF::upperNibbleToASCIIHexDigit; | |
182 using WTF::isASCIIAlphaCaselessEqual; | |
183 | |
184 #endif | |
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