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Side by Side Diff: third_party/WebKit/Source/wtf/ASCIICType.h

Issue 2741343017: Move files in wtf/ to platform/wtf/ (Part 4). (Closed)
Patch Set: Rebase. Created 3 years, 9 months ago
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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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