CharacterData02.java.template revision 8845:4be14673b9bf
1/* 2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package java.lang; 27 28/** The CharacterData class encapsulates the large tables found in 29 Java.lang.Character. */ 30 31class CharacterData02 extends CharacterData { 32 /* The character properties are currently encoded into 32 bits in the following manner: 33 1 bit mirrored property 34 4 bits directionality property 35 9 bits signed offset used for converting case 36 1 bit if 1, adding the signed offset converts the character to lowercase 37 1 bit if 1, subtracting the signed offset converts the character to uppercase 38 1 bit if 1, this character has a titlecase equivalent (possibly itself) 39 3 bits 0 may not be part of an identifier 40 1 ignorable control; may continue a Unicode identifier or Java identifier 41 2 may continue a Java identifier but not a Unicode identifier (unused) 42 3 may continue a Unicode identifier or Java identifier 43 4 is a Java whitespace character 44 5 may start or continue a Java identifier; 45 may continue but not start a Unicode identifier (underscores) 46 6 may start or continue a Java identifier but not a Unicode identifier ($) 47 7 may start or continue a Unicode identifier or Java identifier 48 Thus: 49 5, 6, 7 may start a Java identifier 50 1, 2, 3, 5, 6, 7 may continue a Java identifier 51 7 may start a Unicode identifier 52 1, 3, 5, 7 may continue a Unicode identifier 53 1 is ignorable within an identifier 54 4 is Java whitespace 55 2 bits 0 this character has no numeric property 56 1 adding the digit offset to the character code and then 57 masking with 0x1F will produce the desired numeric value 58 2 this character has a "strange" numeric value 59 3 a Java supradecimal digit: adding the digit offset to the 60 character code, then masking with 0x1F, then adding 10 61 will produce the desired numeric value 62 5 bits digit offset 63 5 bits character type 64 65 The encoding of character properties is subject to change at any time. 66 */ 67 68 int getProperties(int ch) { 69 char offset = (char)ch; 70 int props = $$Lookup(offset); 71 return props; 72 } 73 74 int getPropertiesEx(int ch) { 75 char offset = (char)ch; 76 int props = $$LookupEx(offset); 77 return props; 78 } 79 80 boolean isOtherLowercase(int ch) { 81 int props = getPropertiesEx(ch); 82 return (props & $$maskOtherLowercase) != 0; 83 } 84 85 boolean isOtherUppercase(int ch) { 86 int props = getPropertiesEx(ch); 87 return (props & $$maskOtherUppercase) != 0; 88 } 89 90 boolean isOtherAlphabetic(int ch) { 91 int props = getPropertiesEx(ch); 92 return (props & $$maskOtherAlphabetic) != 0; 93 } 94 95 boolean isIdeographic(int ch) { 96 int props = getPropertiesEx(ch); 97 return (props & $$maskIdeographic) != 0; 98 } 99 100 int getType(int ch) { 101 int props = getProperties(ch); 102 return (props & $$maskType); 103 } 104 105 boolean isJavaIdentifierStart(int ch) { 106 int props = getProperties(ch); 107 return ((props & $$maskIdentifierInfo) >= $$lowJavaStart); 108 } 109 110 boolean isJavaIdentifierPart(int ch) { 111 int props = getProperties(ch); 112 return ((props & $$nonzeroJavaPart) != 0); 113 } 114 115 boolean isUnicodeIdentifierStart(int ch) { 116 int props = getProperties(ch); 117 return ((props & $$maskIdentifierInfo) == $$valueUnicodeStart); 118 } 119 120 boolean isUnicodeIdentifierPart(int ch) { 121 int props = getProperties(ch); 122 return ((props & $$maskUnicodePart) != 0); 123 } 124 125 boolean isIdentifierIgnorable(int ch) { 126 int props = getProperties(ch); 127 return ((props & $$maskIdentifierInfo) == $$valueIgnorable); 128 } 129 130 int toLowerCase(int ch) { 131 int mapChar = ch; 132 int val = getProperties(ch); 133 134 if ((val & $$maskLowerCase) != 0) { 135 int offset = val << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset); 136 mapChar = ch + offset; 137 } 138 return mapChar; 139 } 140 141 int toUpperCase(int ch) { 142 int mapChar = ch; 143 int val = getProperties(ch); 144 145 if ((val & $$maskUpperCase) != 0) { 146 int offset = val << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset); 147 mapChar = ch - offset; 148 } 149 return mapChar; 150 } 151 152 int toTitleCase(int ch) { 153 int mapChar = ch; 154 int val = getProperties(ch); 155 156 if ((val & $$maskTitleCase) != 0) { 157 // There is a titlecase equivalent. Perform further checks: 158 if ((val & $$maskUpperCase) == 0) { 159 // The character does not have an uppercase equivalent, so it must 160 // already be uppercase; so add 1 to get the titlecase form. 161 mapChar = ch + 1; 162 } 163 else if ((val & $$maskLowerCase) == 0) { 164 // The character does not have a lowercase equivalent, so it must 165 // already be lowercase; so subtract 1 to get the titlecase form. 166 mapChar = ch - 1; 167 } 168 // else { 169 // The character has both an uppercase equivalent and a lowercase 170 // equivalent, so it must itself be a titlecase form; return it. 171 // return ch; 172 //} 173 } 174 else if ((val & $$maskUpperCase) != 0) { 175 // This character has no titlecase equivalent but it does have an 176 // uppercase equivalent, so use that (subtract the signed case offset). 177 mapChar = toUpperCase(ch); 178 } 179 return mapChar; 180 } 181 182 int digit(int ch, int radix) { 183 int value = -1; 184 if (radix >= Character.MIN_RADIX && radix <= Character.MAX_RADIX) { 185 int val = getProperties(ch); 186 int kind = val & $$maskType; 187 if (kind == Character.DECIMAL_DIGIT_NUMBER) { 188 value = ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit; 189 } 190 else if ((val & $$maskNumericType) == $$valueJavaSupradecimal) { 191 // Java supradecimal digit 192 value = (ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit) + 10; 193 } 194 } 195 return (value < radix) ? value : -1; 196 } 197 198 int getNumericValue(int ch) { 199 int val = getProperties(ch); 200 int retval = -1; 201 202 switch (val & $$maskNumericType) { 203 default: // cannot occur 204 case ($$valueNotNumeric): // not numeric 205 retval = -1; 206 break; 207 case ($$valueDigit): // simple numeric 208 retval = ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit; 209 break; 210 case ($$valueStrangeNumeric) : // "strange" numeric 211 retval = -2; 212 break; 213 case ($$valueJavaSupradecimal): // Java supradecimal 214 retval = (ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit) + 10; 215 break; 216 } 217 return retval; 218 } 219 220 boolean isWhitespace(int ch) { 221 return (getProperties(ch) & $$maskIdentifierInfo) == $$valueJavaWhitespace; 222 } 223 224 byte getDirectionality(int ch) { 225 int val = getProperties(ch); 226 byte directionality = (byte)((val & $$maskBidi) >> $$shiftBidi); 227 if (directionality == 0xF ) { 228 directionality = Character.DIRECTIONALITY_UNDEFINED; 229 } 230 return directionality; 231 } 232 233 boolean isMirrored(int ch) { 234 return (getProperties(ch) & $$maskMirrored) != 0; 235 } 236 237 static final CharacterData instance = new CharacterData02(); 238 private CharacterData02() {}; 239 240 $$Tables 241 242 static { 243 $$Initializers 244 } 245} 246