POSIX_Unicode.java

/*
 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

import java.util.HashMap;
import java.util.Locale;

public final class POSIX_Unicode {

    public static boolean isAlpha(int ch) {
        return Character.isAlphabetic(ch);
    }

    public static boolean isLower(int ch) {
        return Character.isLowerCase(ch);
    }

    public static boolean isUpper(int ch) {
        return Character.isUpperCase(ch);
    }

    // \p{Whitespace}
    public static boolean isSpace(int ch) {
        return ((((1 << Character.SPACE_SEPARATOR) |
                  (1 << Character.LINE_SEPARATOR) |
                  (1 << Character.PARAGRAPH_SEPARATOR)) >> Character.getType(ch)) & 1)
                   != 0 ||
               (ch >= 0x9 && ch <= 0xd) ||
               (ch == 0x85);
    }

    // \p{gc=Control}
    public static boolean isCntrl(int ch) {
        return Character.getType(ch) == Character.CONTROL;
    }

    // \p{gc=Punctuation}
    public static boolean isPunct(int ch) {
        return ((((1 << Character.CONNECTOR_PUNCTUATION) |
                  (1 << Character.DASH_PUNCTUATION) |
                  (1 << Character.START_PUNCTUATION) |
                  (1 << Character.END_PUNCTUATION) |
                  (1 << Character.OTHER_PUNCTUATION) |
                  (1 << Character.INITIAL_QUOTE_PUNCTUATION) |
                  (1 << Character.FINAL_QUOTE_PUNCTUATION)) >> Character.getType(ch)) & 1)
              != 0;
    }

    // \p{gc=Decimal_Number}
    // \p{Hex_Digit}    -> PropList.txt: Hex_Digit
    public static boolean isHexDigit(int ch) {
        return Character.isDigit(ch) ||
               (ch >= 0x0030 && ch <= 0x0039) ||
               (ch >= 0x0041 && ch <= 0x0046) ||
               (ch >= 0x0061 && ch <= 0x0066) ||
               (ch >= 0xFF10 && ch <= 0xFF19) ||
               (ch >= 0xFF21 && ch <= 0xFF26) ||
               (ch >= 0xFF41 && ch <= 0xFF46);
    }

    // \p{gc=Decimal_Number}
    public static boolean isDigit(int ch) {
        return Character.isDigit(ch);
    };

    // \p{alpha}
    // \p{digit}
    public static boolean isAlnum(int ch) {
        return Character.isAlphabetic(ch) || Character.isDigit(ch);
    }

    // \p{Whitespace} --
    // [\N{LF} \N{VT} \N{FF} \N{CR} \N{NEL}  -> 0xa, 0xb, 0xc, 0xd, 0x85
    //  \p{gc=Line_Separator}
    //  \p{gc=Paragraph_Separator}]
    public static boolean isBlank(int ch) {
        int type = Character.getType(ch);
        return isSpace(ch) &&
               ch != 0xa & ch != 0xb && ch !=0xc && ch != 0xd && ch != 0x85 &&
               type != Character.LINE_SEPARATOR &&
               type != Character.PARAGRAPH_SEPARATOR;
    }

    // [^
    //  \p{space}
    //  \p{gc=Control}
    //  \p{gc=Surrogate}
    //  \p{gc=Unassigned}]
    public static boolean isGraph(int ch) {
        int type = Character.getType(ch);
        return !(isSpace(ch) ||
                 Character.CONTROL == type ||
                 Character.SURROGATE == type ||
                 Character.UNASSIGNED == type);
    }

    // \p{graph}
    // \p{blank}
    // -- \p{cntrl}
    public static boolean isPrint(int ch) {
        return (isGraph(ch) || isBlank(ch)) && !isCntrl(ch);
    }

    // PropList.txt:Noncharacter_Code_Point
    public static boolean isNoncharacterCodePoint(int ch) {
        return (ch & 0xfffe) == 0xfffe || (ch >= 0xfdd0 && ch <= 0xfdef);
    }

    public static boolean isJoinControl(int ch) {
        return (ch == 0x200C || ch == 0x200D);
    }

    //  \p{alpha}
    //  \p{gc=Mark}
    //  \p{digit}
    //  \p{gc=Connector_Punctuation}
    public static boolean isWord(int ch) {
        return isAlpha(ch) ||
               ((((1 << Character.NON_SPACING_MARK) |
                  (1 << Character.ENCLOSING_MARK) |
                  (1 << Character.COMBINING_SPACING_MARK) |
                  (1 << Character.CONNECTOR_PUNCTUATION)) >> Character.getType(ch)) & 1)
               != 0 ||
               isDigit(ch) ||
               isJoinControl(ch);
    }
}