Java example source code file (CharacterDataLatin1.java.template)

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characterdatalatin1, initializers, java, lookup, lookupex, tables

The CharacterDataLatin1.java.template Java example source code

/*
 * Copyright (c) 2002, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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.
 */

package java.lang;

/** The CharacterData class encapsulates the large tables found in
    Java.lang.Character. */

class CharacterDataLatin1 extends CharacterData {

    /* The character properties are currently encoded into 32 bits in the following manner:
        1 bit   mirrored property
        4 bits  directionality property
        9 bits  signed offset used for converting case
        1 bit   if 1, adding the signed offset converts the character to lowercase
        1 bit   if 1, subtracting the signed offset converts the character to uppercase
        1 bit   if 1, this character has a titlecase equivalent (possibly itself)
        3 bits  0  may not be part of an identifier
                1  ignorable control; may continue a Unicode identifier or Java identifier
                2  may continue a Java identifier but not a Unicode identifier (unused)
                3  may continue a Unicode identifier or Java identifier
                4  is a Java whitespace character
                5  may start or continue a Java identifier;
                   may continue but not start a Unicode identifier (underscores)
                6  may start or continue a Java identifier but not a Unicode identifier ($)
                7  may start or continue a Unicode identifier or Java identifier
                Thus:
                   5, 6, 7 may start a Java identifier
                   1, 2, 3, 5, 6, 7 may continue a Java identifier
                   7 may start a Unicode identifier
                   1, 3, 5, 7 may continue a Unicode identifier
                   1 is ignorable within an identifier
                   4 is Java whitespace
        2 bits  0  this character has no numeric property
                1  adding the digit offset to the character code and then
                   masking with 0x1F will produce the desired numeric value
                2  this character has a "strange" numeric value
                3  a Java supradecimal digit: adding the digit offset to the
                   character code, then masking with 0x1F, then adding 10
                   will produce the desired numeric value
        5 bits  digit offset
        5 bits  character type

        The encoding of character properties is subject to change at any time.
     */

    int getProperties(int ch) {
        char offset = (char)ch;
        int props = $$Lookup(offset);
        return props;
    }

    int getPropertiesEx(int ch) {
        char offset = (char)ch;
        int props = $$LookupEx(offset);
        return props;
    }

    boolean isOtherLowercase(int ch) {
        int props = getPropertiesEx(ch);
        return (props & $$maskOtherLowercase) != 0;
    }

    boolean isOtherUppercase(int ch) {
        int props = getPropertiesEx(ch);
        return (props & $$maskOtherUppercase) != 0;
    }

    boolean isOtherAlphabetic(int ch) {
        int props = getPropertiesEx(ch);
        return (props & $$maskOtherAlphabetic) != 0;
    }

    boolean isIdeographic(int ch) {
        int props = getPropertiesEx(ch);
        return (props & $$maskIdeographic) != 0;
    }

    int getType(int ch) {
        int props = getProperties(ch);
        return (props & $$maskType);
    }

    boolean isJavaIdentifierStart(int ch) {
        int props = getProperties(ch);
        return ((props & $$maskIdentifierInfo) >= $$lowJavaStart);
    }

    boolean isJavaIdentifierPart(int ch) {
        int props = getProperties(ch);
        return ((props & $$nonzeroJavaPart) != 0);
    }

    boolean isUnicodeIdentifierStart(int ch) {
        int props = getProperties(ch);
        return ((props & $$maskIdentifierInfo) == $$valueUnicodeStart);
    }

    boolean isUnicodeIdentifierPart(int ch) {
        int props = getProperties(ch);
        return ((props & $$maskUnicodePart) != 0);
    }

    boolean isIdentifierIgnorable(int ch) {
        int props = getProperties(ch);
        return ((props & $$maskIdentifierInfo) == $$valueIgnorable);
    }

    int toLowerCase(int ch) {
        int mapChar = ch;
        int val = getProperties(ch);

        if (((val & $$maskLowerCase) != 0) && 
                ((val & $$maskCaseOffset) != $$maskCaseOffset)) { 
            int offset = val << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset);
            mapChar = ch + offset;
        }
        return mapChar;
    }

    int toUpperCase(int ch) {
        int mapChar = ch;
        int val = getProperties(ch);

        if ((val & $$maskUpperCase) != 0) {
            if ((val & $$maskCaseOffset) != $$maskCaseOffset) {
                int offset = val  << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset);
                mapChar =  ch - offset;
            } else if (ch == 0x00B5) {
                mapChar = 0x039C;
            }
        }
        return mapChar;
    }

    int toTitleCase(int ch) {
        return toUpperCase(ch);
    }

    int digit(int ch, int radix) {
        int value = -1;
        if (radix >= Character.MIN_RADIX && radix <= Character.MAX_RADIX) {
            int val = getProperties(ch);
            int kind = val & $$maskType;
            if (kind == Character.DECIMAL_DIGIT_NUMBER) {
                value = ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit;
            }
            else if ((val & $$maskNumericType) == $$valueJavaSupradecimal) {
                // Java supradecimal digit
                value = (ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit) + 10;
            }
        }
        return (value < radix) ? value : -1;
    }

    int getNumericValue(int ch) {
        int val = getProperties(ch);
        int retval = -1;

        switch (val & $$maskNumericType) {
            default: // cannot occur
            case ($$valueNotNumeric):         // not numeric
                retval = -1;
                break;
            case ($$valueDigit):              // simple numeric
                retval = ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit;
                break;
            case ($$valueStrangeNumeric)      :       // "strange" numeric
                 retval = -2; 
                 break;
            case ($$valueJavaSupradecimal):           // Java supradecimal
                retval = (ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit) + 10;
                break;
        }
        return retval;
    }

    boolean isWhitespace(int ch) {
        int props = getProperties(ch);
        return ((props & $$maskIdentifierInfo) == $$valueJavaWhitespace);
    }

    byte getDirectionality(int ch) {
        int val = getProperties(ch);
        byte directionality = (byte)((val & $$maskBidi) >> $$shiftBidi);

        if (directionality == 0xF ) {
            directionality = -1;
        }
        return directionality;
    }

    boolean isMirrored(int ch) {
        int props = getProperties(ch);
        return ((props & $$maskMirrored) != 0);
    }

    int toUpperCaseEx(int ch) {
        int mapChar = ch;
        int val = getProperties(ch);

        if ((val & $$maskUpperCase) != 0) {
            if ((val & $$maskCaseOffset) != $$maskCaseOffset) {
                int offset = val  << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset);
                mapChar =  ch - offset;
            }
            else {
                switch(ch) {
                    // map overflow characters
                    case 0x00B5 : mapChar = 0x039C; break;
                    default       : mapChar = Character.ERROR; break;
                }
            }
        }
        return mapChar;
    }

    static char[] sharpsMap = new char[] {'S', 'S'};

    char[] toUpperCaseCharArray(int ch) {
        char[] upperMap = {(char)ch};
        if (ch == 0x00DF) {
            upperMap = sharpsMap;
        }
        return upperMap;
    }

    static final CharacterDataLatin1 instance = new CharacterDataLatin1();
    private CharacterDataLatin1() {};

    $$Tables

    static {
        $$Initializers
    }        
}