Character.h

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/**************************************************************************************************
 * Copyright (c) 2021 Calypso Networks Association https://calypsonet.org/                        *
 *                                                                                                *
 * See the NOTICE file(s) distributed with this work for additional information regarding         *
 * copyright ownership.                                                                           *
 *                                                                                                *
 * This program and the accompanying materials are made available under the terms of the Eclipse  *
 * Public License 2.0 which is available at http://www.eclipse.org/legal/epl-2.0                  *
 *                                                                                                *
 * SPDX-License-Identifier: EPL-2.0                                                               *
 **************************************************************************************************/
 
#pragma once
 
namespace keyple {
namespace core {
namespace util {
namespace cpp {
 
class Character {
public:
    static char digit(char ch, int radix)
    {
        (void)radix;
 
        if (ch >= '0' && ch <= '9')
            return ch - '0';
        if (ch >= 'A' && ch <= 'Z')
            return ch - 'A' + 10;
        if (ch >= 'a' && ch <= 'z')
            return ch - 'a' + 10;
 
        return 0;
    }
 
    static bool isWhitespace(char c)
    {
        return isWhitespace((int)c);
    }
 
    static bool isWhitespace(int codePoint)
    {
 
        if ((codePoint >= 0x1c && codePoint <= 0x20) ||
            (codePoint >= 0x09 && codePoint <= 0x0d)) {
            return true;
        }
        if (codePoint < 0x1000) {
            return false;
        }
 
        /* OGHAM SPACE MARK or MONGOLIAN VOWEL SEPARATOR? */
        if (codePoint == 0x1680 || codePoint == 0x180e) {
            return true;
        }
        if (codePoint < 0x2000) {
            return false;
        }
 
        /* Exclude General Punctuation's non-breaking spaces (which includes FIGURE SPACE). */
        if (codePoint == 0x2007 || codePoint == 0x202f) {
            return false;
        }
        if (codePoint <= 0xffff) {
            /* Other whitespace from General Punctuation... */
            return codePoint <= 0x200a || codePoint == 0x2028 ||
                   codePoint == 0x2029 || codePoint == 0x205f ||
                   codePoint == 0x3000; /* ...or CJK Symbols and Punctuation? */
        }
        /* Let icu4c worry about non-BMP code points. */
        //return isWhitespaceImpl(codePoint);
        return false;
    }
};
 
}
}
}
}