/*
 * Copyright (C) 2007 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> 

// 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 !WK_PLATFORM(WIN_OS) || defined(_NATIVE_WCHAR_T_DEFINED)
    inline bool isASCIIAlpha(wchar_t c) { return (c | 0x20) >= 'a' && (c | 0x20) <= 'z'; }
#endif

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

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

    inline bool isASCIISpace(char c) { return c == '\t' || c == '\n' || c == '\v' || c =='\f' || c == '\r' || c == ' '; }
    inline bool isASCIISpace(unsigned short c) { return c == '\t' || c == '\n' || c == '\v' || c =='\f' || c == '\r' || c == ' '; }
#if !WK_PLATFORM(WIN_OS) || defined(_NATIVE_WCHAR_T_DEFINED)
    inline bool isASCIISpace(wchar_t c) { return c == '\t' || c == '\n' || c == '\v' || c =='\f' || c == '\r' || c == ' '; }
#endif

    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 !WK_PLATFORM(WIN_OS) || defined(_NATIVE_WCHAR_T_DEFINED)
    inline wchar_t toASCIILower(wchar_t c) { return c | ((c >= 'A' && c <= 'Z') << 5); }
#endif

    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 !WK_PLATFORM(WIN_OS) || defined(_NATIVE_WCHAR_T_DEFINED)
    inline wchar_t toASCIIUpper(wchar_t c) { return static_cast<wchar_t>(c & ~((c >= 'a' && c <= 'z') << 5)); }
#endif

}

#endif
