/*
* Copyright 2003-2006 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.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 CharacterData02 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 = $$Lookup(offset);
return props;
}
int getType(int ch) {
int props = getProperties(ch);
return (props & $$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 & $$maskLowerCase) != 0) {
int offset = val << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset);
mapChar = ch + offset;
}
return mapChar;
}
int toUpperCase(int ch) {
int mapChar = ch;
int val = getProperties(ch);
if ((val & $$maskUpperCase) != 0) {
int offset = val << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset);
mapChar = ch - offset;
}
return mapChar;
}
int toTitleCase(int ch) {
int mapChar = ch;
int val = getProperties(ch);
if ((val & $$maskTitleCase) != 0) {
// There is a titlecase equivalent. Perform further checks:
if ((val & $$maskUpperCase) == 0) {
// The character does not have an uppercase equivalent, so it must
// already be uppercase; so add 1 to get the titlecase form.
mapChar = ch + 1;
}
else if ((val & $$maskLowerCase) == 0) {
// The character does not have a lowercase equivalent, so it must
// already be lowercase; so subtract 1 to get the titlecase form.
mapChar = ch - 1;
}
// else {
// The character has both an uppercase equivalent and a lowercase
// equivalent, so it must itself be a titlecase form; return it.
// return ch;
//}
}
else if ((val & $$maskUpperCase) != 0) {
// This character has no titlecase equivalent but it does have an
// uppercase equivalent, so use that (subtract the signed case offset).
mapChar = toUpperCase(ch);
}
return mapChar;
}
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) {
return (getProperties(ch) & $$maskIdentifierInfo) == $$valueJavaWhitespace;
}
byte getDirectionality(int ch) {
int val = getProperties(ch);
byte directionality = (byte)((val & $$maskBidi) >> $$shiftBidi);
if (directionality == 0xF ) {
directionality = Character.DIRECTIONALITY_UNDEFINED;
}
return directionality;
}
boolean isMirrored(int ch) {
return (getProperties(ch) & $$maskMirrored) != 0;
}
static final CharacterData instance = new CharacterData02();
private CharacterData02() {};
$$Tables
static {
$$Initializers
}
}