1/*
2 * Copyright (C) 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
3 *
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
29#ifndef WTF_ASCIICType_h
30#define WTF_ASCIICType_h
31
32#include <wtf/Assertions.h>
33
34// The behavior of many of the functions in the <ctype.h> header is dependent
35// on the current locale. But in the WebKit project, all uses of those functions
36// are in code processing something that's not locale-specific. These equivalents
37// for some of the <ctype.h> functions are named more explicitly, not dependent
38// on the C library locale, and we should also optimize them as needed.
39
40// All functions return false or leave the character unchanged if passed a character
41// that is outside the range 0-7F. So they can be used on Unicode strings or
42// characters if the intent is to do processing only if the character is ASCII.
43
44namespace WTF {
45
46template<typename CharType> inline bool isASCII(CharType c)
47{
48 return !(c & ~0x7F);
49}
50
51template<typename CharType> inline bool isASCIIAlpha(CharType c)
52{
53 return (c | 0x20) >= 'a' && (c | 0x20) <= 'z';
54}
55
56template<typename CharType> inline bool isASCIIDigit(CharType c)
57{
58 return c >= '0' && c <= '9';
59}
60
61template<typename CharType> inline bool isASCIIAlphanumeric(CharType c)
62{
63 return isASCIIDigit(c) || isASCIIAlpha(c);
64}
65
66template<typename CharType> inline bool isASCIIHexDigit(CharType c)
67{
68 return isASCIIDigit(c) || ((c | 0x20) >= 'a' && (c | 0x20) <= 'f');
69}
70
71template<typename CharType> inline bool isASCIILower(CharType c)
72{
73 return c >= 'a' && c <= 'z';
74}
75
76template<typename CharType> inline bool isASCIIOctalDigit(CharType c)
77{
78 return (c >= '0') & (c <= '7');
79}
80
81template<typename CharType> inline bool isASCIIPrintable(CharType c)
82{
83 return c >= ' ' && c <= '~';
84}
85
86/*
87 Statistics from a run of Apple's page load test for callers of isASCIISpace:
88
89 character count
90 --------- -----
91 non-spaces 689383
92 20 space 294720
93 0A \n 89059
94 09 \t 28320
95 0D \r 0
96 0C \f 0
97 0B \v 0
98 */
99template<typename CharType> inline bool isASCIISpace(CharType c)
100{
101 return c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9));
102}
103
104template<typename CharType> inline bool isASCIIUpper(CharType c)
105{
106 return c >= 'A' && c <= 'Z';
107}
108
109template<typename CharType> inline CharType toASCIILower(CharType c)
110{
111 return c | ((c >= 'A' && c <= 'Z') << 5);
112}
113
114template<typename CharType> inline CharType toASCIILowerUnchecked(CharType character)
115{
116 // This function can be used for comparing any input character
117 // to a lowercase English character. The isASCIIAlphaCaselessEqual
118 // below should be used for regular comparison of ASCII alpha
119 // characters, but switch statements in CSS tokenizer require
120 // direct use of this function.
121 return character | 0x20;
122}
123
124template<typename CharType> inline CharType toASCIIUpper(CharType c)
125{
126 return c & ~((c >= 'a' && c <= 'z') << 5);
127}
128
129template<typename CharType> inline int toASCIIHexValue(CharType c)
130{
131 ASSERT(isASCIIHexDigit(c));
132 return c < 'A' ? c - '0' : (c - 'A' + 10) & 0xF;
133}
134
135template<typename CharType> inline int toASCIIHexValue(CharType upperValue, CharType lowerValue)
136{
137 ASSERT(isASCIIHexDigit(upperValue) && isASCIIHexDigit(lowerValue));
138 return ((toASCIIHexValue(upperValue) << 4) & 0xF0) | toASCIIHexValue(lowerValue);
139}
140
141inline char lowerNibbleToASCIIHexDigit(char c)
142{
143 char nibble = c & 0xF;
144 return nibble < 10 ? '0' + nibble : 'A' + nibble - 10;
145}
146
147inline char upperNibbleToASCIIHexDigit(char c)
148{
149 char nibble = (c >> 4) & 0xF;
150 return nibble < 10 ? '0' + nibble : 'A' + nibble - 10;
151}
152
153template<typename CharType> inline bool isASCIIAlphaCaselessEqual(CharType cssCharacter, char character)
154{
155 // This function compares a (preferrably) constant ASCII
156 // lowercase letter to any input character.
157 ASSERT(character >= 'a' && character <= 'z');
158 return LIKELY(toASCIILowerUnchecked(cssCharacter) == character);
159}
160
161}
162
163using WTF::isASCII;
164using WTF::isASCIIAlpha;
165using WTF::isASCIIAlphanumeric;
166using WTF::isASCIIDigit;
167using WTF::isASCIIHexDigit;
168using WTF::isASCIILower;
169using WTF::isASCIIOctalDigit;
170using WTF::isASCIIPrintable;
171using WTF::isASCIISpace;
172using WTF::isASCIIUpper;
173using WTF::toASCIIHexValue;
174using WTF::toASCIILower;
175using WTF::toASCIILowerUnchecked;
176using WTF::toASCIIUpper;
177using WTF::lowerNibbleToASCIIHexDigit;
178using WTF::upperNibbleToASCIIHexDigit;
179using WTF::isASCIIAlphaCaselessEqual;
180
181#endif
182

source code of qtdeclarative/src/3rdparty/masm/wtf/ASCIICType.h