/*
 * Copyright (C) 2007, 2008 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/Platform.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
{

inline bool isASCIIAlpha(char c)
{
    return (c | 0x20) >= 'a' && (c | 0x20) <= 'z';
}
inline bool isASCIIAlpha(unsigned short c)
{
    return (c | 0x20) >= 'a' && (c | 0x20) <= 'z';
}
#if !defined(WTF_COMPILER_MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
inline bool isASCIIAlpha(wchar_t c)
{
    return (c | 0x20) >= 'a' && (c | 0x20) <= 'z';
}
#endif
inline bool isASCIIAlpha(int c)
{
    return (c | 0x20) >= 'a' && (c | 0x20) <= 'z';
}

inline bool isASCIIAlphanumeric(char c)
{
    return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'z');
}
inline bool isASCIIAlphanumeric(unsigned short c)
{
    return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'z');
}
#if !defined(WTF_COMPILER_MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
inline bool isASCIIAlphanumeric(wchar_t c)
{
    return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'z');
}
#endif
inline bool isASCIIAlphanumeric(int c)
{
    return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'z');
}

inline bool isASCIIDigit(char c)
{
    return (c >= '0') & (c <= '9');
}
inline bool isASCIIDigit(unsigned short c)
{
    return (c >= '0') & (c <= '9');
}
#if !defined(WTF_COMPILER_MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
inline bool isASCIIDigit(wchar_t c)
{
    return (c >= '0') & (c <= '9');
}
#endif
inline bool isASCIIDigit(int c)
{
    return (c >= '0') & (c <= '9');
}

inline bool isASCIIHexDigit(char c)
{
    return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'f');
}
inline bool isASCIIHexDigit(unsigned short c)
{
    return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'f');
}
#if !defined(WTF_COMPILER_MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
inline bool isASCIIHexDigit(wchar_t c)
{
    return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'f');
}
#endif
inline bool isASCIIHexDigit(int c)
{
    return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'f');
}

inline bool isASCIILower(char c)
{
    return c >= 'a' && c <= 'z';
}
inline bool isASCIILower(unsigned short c)
{
    return c >= 'a' && c <= 'z';
}
#if !defined(WTF_COMPILER_MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
inline bool isASCIILower(wchar_t c)
{
    return c >= 'a' && c <= 'z';
}
#endif
inline bool isASCIILower(int c)
{
    return c >= 'a' && c <= 'z';
}

inline bool isASCIIUpper(char c)
{
    return c >= 'A' && c <= 'Z';
}
inline bool isASCIIUpper(unsigned short c)
{
    return c >= 'A' && c <= 'Z';
}
#if !defined(WTF_COMPILER_MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
inline bool isASCIIUpper(wchar_t c)
{
    return c >= 'A' && c <= 'Z';
}
#endif
inline bool isASCIIUpper(int c)
{
    return c >= 'A' && c <= 'Z';
}

/*
    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
*/
inline bool isASCIISpace(char c)
{
    return c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9));
}
inline bool isASCIISpace(unsigned short c)
{
    return c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9));
}
#if !defined(WTF_COMPILER_MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
inline bool isASCIISpace(wchar_t c)
{
    return c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9));
}
#endif
inline bool isASCIISpace(int c)
{
    return c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9));
}

inline char toASCIILower(char c)
{
    return c | ((c >= 'A' && c <= 'Z') << 5);
}
inline unsigned short toASCIILower(unsigned short c)
{
    return c | ((c >= 'A' && c <= 'Z') << 5);
}
#if !defined(WTF_COMPILER_MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
inline wchar_t toASCIILower(wchar_t c)
{
    return c | ((c >= 'A' && c <= 'Z') << 5);
}
#endif
inline int toASCIILower(int c)
{
    return c | ((c >= 'A' && c <= 'Z') << 5);
}

inline char toASCIIUpper(char c)
{
    return static_cast<char>(c & ~((c >= 'a' && c <= 'z') << 5));
}
inline unsigned short toASCIIUpper(unsigned short c)
{
    return static_cast<unsigned short>(c & ~((c >= 'a' && c <= 'z') << 5));
}
#if !defined(WTF_COMPILER_MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
inline wchar_t toASCIIUpper(wchar_t c)
{
    return static_cast<wchar_t>(c & ~((c >= 'a' && c <= 'z') << 5));
}
#endif
inline int toASCIIUpper(int c)
{
    return static_cast<int>(c & ~((c >= 'a' && c <= 'z') << 5));
}

inline int toASCIIHexValue(char c)
{
    ASSERT(isASCIIHexDigit(c));
    return c < 'A' ? c - '0' : (c - 'A' + 10) & 0xF;
}
inline int toASCIIHexValue(unsigned short c)
{
    ASSERT(isASCIIHexDigit(c));
    return c < 'A' ? c - '0' : (c - 'A' + 10) & 0xF;
}
#if !defined(WTF_COMPILER_MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
inline int toASCIIHexValue(wchar_t c)
{
    ASSERT(isASCIIHexDigit(c));
    return c < 'A' ? c - '0' : (c - 'A' + 10) & 0xF;
}
#endif
inline int toASCIIHexValue(int c)
{
    ASSERT(isASCIIHexDigit(c));
    return c < 'A' ? c - '0' : (c - 'A' + 10) & 0xF;
}

}

#endif
