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/*
* Copyright (C) 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef WTF_ASCIICType_h
#define WTF_ASCIICType_h
#include <wtf/Assertions.h>
// The behavior of many of the functions in the <ctype.h> header is dependent
// on the current locale. But in the WebKit project, all uses of those functions
// are in code processing something that's not locale-specific. These equivalents
// for some of the <ctype.h> functions are named more explicitly, not dependent
// on the C library locale, and we should also optimize them as needed.
// All functions return false or leave the character unchanged if passed a character
// that is outside the range 0-7F. So they can be used on Unicode strings or
// characters if the intent is to do processing only if the character is ASCII.
namespace WTF {
template<typename CharType> inline bool isASCII(CharType c)
{
return !(c & ~0x7F);
}
template<typename CharType> inline bool isASCIIAlpha(CharType c)
{
return (c | 0x20) >= 'a' && (c | 0x20) <= 'z';
}
template<typename CharType> inline bool isASCIIDigit(CharType c)
{
return c >= '0' && c <= '9';
}
template<typename CharType> inline bool isASCIIAlphanumeric(CharType c)
{
return isASCIIDigit(c) || isASCIIAlpha(c);
}
template<typename CharType> inline bool isASCIIHexDigit(CharType c)
{
return isASCIIDigit(c) || ((c | 0x20) >= 'a' && (c | 0x20) <= 'f');
}
template<typename CharType> inline bool isASCIILower(CharType c)
{
return c >= 'a' && c <= 'z';
}
template<typename CharType> inline bool isASCIIOctalDigit(CharType c)
{
return (c >= '0') & (c <= '7');
}
template<typename CharType> inline bool isASCIIPrintable(CharType c)
{
return c >= ' ' && c <= '~';
}
/*
Statistics from a run of Apple's page load test for callers of isASCIISpace:
character count
--------- -----
non-spaces 689383
20 space 294720
0A \n 89059
09 \t 28320
0D \r 0
0C \f 0
0B \v 0
*/
template<typename CharType> inline bool isASCIISpace(CharType c)
{
return c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9));
}
template<typename CharType> inline bool isASCIIUpper(CharType c)
{
return c >= 'A' && c <= 'Z';
}
template<typename CharType> inline CharType toASCIILower(CharType c)
{
return c | ((c >= 'A' && c <= 'Z') << 5);
}
template<typename CharType> inline CharType toASCIILowerUnchecked(CharType character)
{
// This function can be used for comparing any input character
// to a lowercase English character. The isASCIIAlphaCaselessEqual
// below should be used for regular comparison of ASCII alpha
// characters, but switch statements in CSS tokenizer require
// direct use of this function.
return character | 0x20;
}
template<typename CharType> inline CharType toASCIIUpper(CharType c)
{
return c & ~((c >= 'a' && c <= 'z') << 5);
}
template<typename CharType> inline int toASCIIHexValue(CharType c)
{
ASSERT(isASCIIHexDigit(c));
return c < 'A' ? c - '0' : (c - 'A' + 10) & 0xF;
}
template<typename CharType> inline int toASCIIHexValue(CharType upperValue, CharType lowerValue)
{
ASSERT(isASCIIHexDigit(upperValue) && isASCIIHexDigit(lowerValue));
return ((toASCIIHexValue(upperValue) << 4) & 0xF0) | toASCIIHexValue(lowerValue);
}
inline char lowerNibbleToASCIIHexDigit(char c)
{
char nibble = c & 0xF;
return nibble < 10 ? '0' + nibble : 'A' + nibble - 10;
}
inline char upperNibbleToASCIIHexDigit(char c)
{
char nibble = (c >> 4) & 0xF;
return nibble < 10 ? '0' + nibble : 'A' + nibble - 10;
}
template<typename CharType> inline bool isASCIIAlphaCaselessEqual(CharType cssCharacter, char character)
{
// This function compares a (preferrably) constant ASCII
// lowercase letter to any input character.
ASSERT(character >= 'a' && character <= 'z');
return LIKELY(toASCIILowerUnchecked(cssCharacter) == character);
}
}
using WTF::isASCII;
using WTF::isASCIIAlpha;
using WTF::isASCIIAlphanumeric;
using WTF::isASCIIDigit;
using WTF::isASCIIHexDigit;
using WTF::isASCIILower;
using WTF::isASCIIOctalDigit;
using WTF::isASCIIPrintable;
using WTF::isASCIISpace;
using WTF::isASCIIUpper;
using WTF::toASCIIHexValue;
using WTF::toASCIILower;
using WTF::toASCIILowerUnchecked;
using WTF::toASCIIUpper;
using WTF::lowerNibbleToASCIIHexDigit;
using WTF::upperNibbleToASCIIHexDigit;
using WTF::isASCIIAlphaCaselessEqual;
#endif
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