JavaScriptCore/wtf/ASCIICType.h

/*
 * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
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 * 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. 
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 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution. 
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 *     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
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 */

#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 !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 !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 !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 !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 isASCIIOctalDigit(char c) { return (c >= '0') & (c <= '7'); }
    inline bool isASCIIOctalDigit(unsigned short c) { return (c >= '0') & (c <= '7'); }
#if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
    inline bool isASCIIOctalDigit(wchar_t c) { return (c >= '0') & (c <= '7'); }
#endif
    inline bool isASCIIOctalDigit(int c) { return (c >= '0') & (c <= '7'); }

    inline bool isASCIILower(char c) { return c >= 'a' && c <= 'z'; }
    inline bool isASCIILower(unsigned short c) { return c >= 'a' && c <= 'z'; }
#if !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 !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 the PLT on the usage of isASCIISpace:
        Hex  Name               Count
        ---  ----               -----
           ALL OTHER VALUES     689383
        x20  SPACE              294720
        x0A  NEWLINE            89059
        x09  TAB                28320
        x0D  CARRIAGE RETURN    0
        x0C  FORMFEED           0
        x0B  VERTICAL TAB       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 !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 !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 !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)); }

}

#endif