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246 lines
9.0 KiB
Plaintext
246 lines
9.0 KiB
Plaintext
/*
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* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang;
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/** The CharacterData class encapsulates the large tables found in
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Java.lang.Character. */
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class CharacterData02 extends CharacterData {
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/* The character properties are currently encoded into 32 bits in the following manner:
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1 bit mirrored property
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4 bits directionality property
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9 bits signed offset used for converting case
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1 bit if 1, adding the signed offset converts the character to lowercase
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1 bit if 1, subtracting the signed offset converts the character to uppercase
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1 bit if 1, this character has a titlecase equivalent (possibly itself)
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3 bits 0 may not be part of an identifier
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1 ignorable control; may continue a Unicode identifier or Java identifier
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2 may continue a Java identifier but not a Unicode identifier (unused)
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3 may continue a Unicode identifier or Java identifier
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4 is a Java whitespace character
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5 may start or continue a Java identifier;
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may continue but not start a Unicode identifier (underscores)
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6 may start or continue a Java identifier but not a Unicode identifier ($)
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7 may start or continue a Unicode identifier or Java identifier
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Thus:
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5, 6, 7 may start a Java identifier
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1, 2, 3, 5, 6, 7 may continue a Java identifier
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7 may start a Unicode identifier
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1, 3, 5, 7 may continue a Unicode identifier
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1 is ignorable within an identifier
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4 is Java whitespace
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2 bits 0 this character has no numeric property
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1 adding the digit offset to the character code and then
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masking with 0x1F will produce the desired numeric value
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2 this character has a "strange" numeric value
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3 a Java supradecimal digit: adding the digit offset to the
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character code, then masking with 0x1F, then adding 10
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will produce the desired numeric value
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5 bits digit offset
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5 bits character type
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The encoding of character properties is subject to change at any time.
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*/
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int getProperties(int ch) {
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char offset = (char)ch;
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int props = $$Lookup(offset);
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return props;
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}
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int getPropertiesEx(int ch) {
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char offset = (char)ch;
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int props = $$LookupEx(offset);
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return props;
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}
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boolean isOtherLowercase(int ch) {
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int props = getPropertiesEx(ch);
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return (props & $$maskOtherLowercase) != 0;
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}
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boolean isOtherUppercase(int ch) {
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int props = getPropertiesEx(ch);
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return (props & $$maskOtherUppercase) != 0;
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}
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boolean isOtherAlphabetic(int ch) {
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int props = getPropertiesEx(ch);
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return (props & $$maskOtherAlphabetic) != 0;
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}
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boolean isIdeographic(int ch) {
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int props = getPropertiesEx(ch);
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return (props & $$maskIdeographic) != 0;
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}
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int getType(int ch) {
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int props = getProperties(ch);
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return (props & $$maskType);
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}
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boolean isJavaIdentifierStart(int ch) {
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int props = getProperties(ch);
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return ((props & $$maskIdentifierInfo) >= $$lowJavaStart);
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}
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boolean isJavaIdentifierPart(int ch) {
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int props = getProperties(ch);
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return ((props & $$nonzeroJavaPart) != 0);
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}
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boolean isUnicodeIdentifierStart(int ch) {
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int props = getProperties(ch);
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return ((props & $$maskIdentifierInfo) == $$valueUnicodeStart);
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}
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boolean isUnicodeIdentifierPart(int ch) {
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int props = getProperties(ch);
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return ((props & $$maskUnicodePart) != 0);
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}
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boolean isIdentifierIgnorable(int ch) {
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int props = getProperties(ch);
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return ((props & $$maskIdentifierInfo) == $$valueIgnorable);
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}
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int toLowerCase(int ch) {
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int mapChar = ch;
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int val = getProperties(ch);
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if ((val & $$maskLowerCase) != 0) {
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int offset = val << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset);
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mapChar = ch + offset;
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}
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return mapChar;
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}
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int toUpperCase(int ch) {
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int mapChar = ch;
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int val = getProperties(ch);
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if ((val & $$maskUpperCase) != 0) {
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int offset = val << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset);
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mapChar = ch - offset;
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}
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return mapChar;
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}
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int toTitleCase(int ch) {
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int mapChar = ch;
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int val = getProperties(ch);
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if ((val & $$maskTitleCase) != 0) {
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// There is a titlecase equivalent. Perform further checks:
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if ((val & $$maskUpperCase) == 0) {
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// The character does not have an uppercase equivalent, so it must
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// already be uppercase; so add 1 to get the titlecase form.
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mapChar = ch + 1;
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}
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else if ((val & $$maskLowerCase) == 0) {
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// The character does not have a lowercase equivalent, so it must
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// already be lowercase; so subtract 1 to get the titlecase form.
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mapChar = ch - 1;
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}
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// else {
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// The character has both an uppercase equivalent and a lowercase
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// equivalent, so it must itself be a titlecase form; return it.
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// return ch;
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//}
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}
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else if ((val & $$maskUpperCase) != 0) {
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// This character has no titlecase equivalent but it does have an
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// uppercase equivalent, so use that (subtract the signed case offset).
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mapChar = toUpperCase(ch);
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}
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return mapChar;
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}
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int digit(int ch, int radix) {
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int value = -1;
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if (radix >= Character.MIN_RADIX && radix <= Character.MAX_RADIX) {
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int val = getProperties(ch);
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int kind = val & $$maskType;
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if (kind == Character.DECIMAL_DIGIT_NUMBER) {
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value = ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit;
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}
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else if ((val & $$maskNumericType) == $$valueJavaSupradecimal) {
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// Java supradecimal digit
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value = (ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit) + 10;
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}
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}
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return (value < radix) ? value : -1;
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}
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int getNumericValue(int ch) {
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int val = getProperties(ch);
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int retval = -1;
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switch (val & $$maskNumericType) {
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default: // cannot occur
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case ($$valueNotNumeric): // not numeric
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retval = -1;
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break;
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case ($$valueDigit): // simple numeric
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retval = ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit;
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break;
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case ($$valueStrangeNumeric) : // "strange" numeric
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retval = -2;
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break;
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case ($$valueJavaSupradecimal): // Java supradecimal
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retval = (ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit) + 10;
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break;
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}
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return retval;
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}
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boolean isWhitespace(int ch) {
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return (getProperties(ch) & $$maskIdentifierInfo) == $$valueJavaWhitespace;
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}
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byte getDirectionality(int ch) {
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int val = getProperties(ch);
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byte directionality = (byte)((val & $$maskBidi) >> $$shiftBidi);
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if (directionality == 0xF ) {
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directionality = Character.DIRECTIONALITY_UNDEFINED;
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}
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return directionality;
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}
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boolean isMirrored(int ch) {
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return (getProperties(ch) & $$maskMirrored) != 0;
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}
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static final CharacterData instance = new CharacterData02();
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private CharacterData02() {};
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$$Tables
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static {
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$$Initializers
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}
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}
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