libjava/java/lang/natCharacter.cc

   1 /* java.lang.Character -- Wrapper class for char, and Unicode subsets
   2    Copyright (C) 1998, 1999, 2001, 2002 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 #include <config.h>
  39
  40 #include <gcj/cni.h>
  41 #include <jvm.h>
  42 #include <java/lang/Character.h>
  43
  44 #include <java-chartables.h>
  45
  46 \f
  47
  48 // These constants define the return values for characters that are unassigned
  49 // or reserved for private use.
  50 #define UNASSIGNED_TYPE 0
  51 #define UNASSIGNED_DIGIT -1
  52 #define UNASSIGNED_DIRECTION -1
  53 #define UNASSIGNED_NUMERIC_VALUE -1
  54
  55 #define PRIVATE_TYPE 18
  56 #define PRIVATE_DIRECTION 0
  57
  58 // The methods that take a char as an argument all have counterparts that
  59 // take ints.  The ones that take chars only work for the BMP or plane 0 of the
  60 // Unicode standard but the ones that take ints work for all Unicode code
  61 // points.  However, the ones that take chars don't simply redirect the calls
  62 // because the BMP is by far the most used plane so saving a little time on
  63 // each call makes sense.
  64
  65 jchar
  66 java::lang::Character::readChar(jchar ch)
  67 {
  68   // Perform 16-bit addition to find the correct entry in data.
  69   return data[0][(jchar) (blocks[0][ch >> shift[0]] + ch)];
  70 }
  71
  72 jchar
  73 java::lang::Character::readCodePoint(jint codePoint)
  74 {
  75   jint plane = codePoint >> 16;
  76   jchar offset = (jchar)(codePoint & 0xffff);
  77   // Be careful not to call this method with an unassigned character.  The only
  78   // characters assigned as of Unicode 4.0.0 belong to planes 0, 1, 2, and 14.
  79   return data[plane][(jchar) (blocks[plane][offset >> shift[plane]] + offset)];
  80 }
  81
  82 jint
  83 java::lang::Character::getType(jchar ch)
  84 {
  85   // Perform 16-bit addition to find the correct entry in data.
  86   return (jint) (data[0][(jchar) (blocks[0][ch >> shift[0]] + ch)] & TYPE_MASK);
  87 }
  88
  89 jint
  90 java::lang::Character::getType(jint codePoint)
  91 {
  92   jint plane = codePoint >> 16;
  93   if (plane > 2 && plane != 14)
  94     {
  95       if (plane > 14 && ((codePoint & 0xffff) < 0xfffe))
  96         return (jint) PRIVATE_TYPE;
  97       return (jint) UNASSIGNED_TYPE;
  98     }
  99   jint offset = codePoint & 0xffff;
 100   return (jint)
 101     (data[plane]
 102      [(jchar) (blocks[plane][offset >> shift[plane]] + offset)] & TYPE_MASK);
 103 }
 104
 105 jchar
 106 java::lang::Character::toLowerCase(jchar ch)
 107 {
 108   return (jchar) (ch + lower[0][readChar(ch) >> 7]);
 109 }
 110
 111 jint
 112 java::lang::Character::toLowerCase(jint codePoint)
 113 {
 114   jint plane = codePoint >> 16;
 115   if (plane > 2 && plane != 14)
 116     return codePoint;
 117   return (lower[plane][readCodePoint(codePoint) >> 7]) + codePoint;
 118 }
 119
 120 jchar
 121 java::lang::Character::toUpperCase(jchar ch)
 122 {
 123   return (jchar) (ch + upper[0][readChar(ch) >> 7]);
 124 }
 125
 126 jint
 127 java::lang::Character::toUpperCase(jint codePoint)
 128 {
 129   jint plane = codePoint >> 16;
 130   if (plane > 2 && plane != 14)
 131     return codePoint;
 132   return (upper[plane][readCodePoint(codePoint) >> 7]) + codePoint;
 133 }
 134
 135 jchar
 136 java::lang::Character::toTitleCase(jchar ch)
 137 {
 138   // As title is short, it doesn't hurt to exhaustively iterate over it.
 139   for (int i = title_length - 2; i >= 0; i -= 2)
 140     if (title[i] == ch)
 141       return title[i + 1];
 142   return toUpperCase(ch);
 143 }
 144
 145 jint
 146 java::lang::Character::toTitleCase(jint codePoint)
 147 {
 148   // As of Unicode 4.0.0 no characters outside of plane 0 have titlecase
 149   // mappings that are different from their uppercase mapping.
 150   if (codePoint < 0x10000)
 151     return toTitleCase((jchar)codePoint);
 152   return toUpperCase(codePoint);
 153 }
 154
 155 jint
 156 java::lang::Character::digit(jchar ch, jint radix)
 157 {
 158   if (radix < MIN_RADIX || radix > MAX_RADIX)
 159     return (jint) -1;
 160   jchar attr = readChar(ch);
 161   if (((1 << (attr & TYPE_MASK))
 162        & ((1 << UPPERCASE_LETTER)
 163           | (1 << LOWERCASE_LETTER)
 164           | (1 << DECIMAL_DIGIT_NUMBER))))
 165     {
 166       // Signedness doesn't matter; 0xffff vs. -1 are both rejected.
 167       jint digit = (jint) numValue[0][attr >> 7];
 168       return (digit >= 0 && digit < radix) ? digit : (jint) -1;
 169     }
 170   return (jint) -1;
 171 }
 172
 173 jint
 174 java::lang::Character::digit(jint codePoint, jint radix)
 175 {
 176   if (radix < MIN_RADIX || radix > MAX_RADIX)
 177     return (jint) -1;
 178
 179   jint plane = codePoint >> 16;
 180   if (plane > 2 && plane != 14)
 181     return UNASSIGNED_DIGIT;
 182
 183   jchar attr = readCodePoint(codePoint);
 184   if (((1 << (attr & TYPE_MASK))
 185        & ((1 << UPPERCASE_LETTER)
 186           | (1 << LOWERCASE_LETTER)
 187           | (1 << DECIMAL_DIGIT_NUMBER))))
 188     {
 189       // Signedness doesn't matter; 0xffff vs. -1 are both rejected.
 190       jint digit = (jint) numValue[plane][attr >> 7];
 191       if (digit <= -3)
 192         digit = largenums[-digit -3];
 193       return (digit >= 0 && digit < radix) ? digit : (jint) -1;
 194     }
 195   return (jint) -1;
 196
 197 }
 198
 199 jint
 200 java::lang::Character::getNumericValue(jchar ch)
 201 {
 202   // numValue is stored as an array of jshort, since 10000 is the maximum.
 203   return (jint) numValue[0][readChar(ch) >> 7];
 204 }
 205
 206 jint
 207 java::lang::Character::getNumericValue(jint codePoint)
 208 {
 209   jint plane = codePoint >> 16;
 210   if (plane > 2 && plane != 14)
 211     return UNASSIGNED_NUMERIC_VALUE;
 212   jshort num = numValue[plane][readCodePoint(codePoint) >> 7];
 213   if (num <= -3)
 214     return largenums[-num - 3];
 215   return num;
 216 }
 217
 218 jbyte
 219 java::lang::Character::getDirectionality(jchar ch)
 220 {
 221   return direction[0][readChar(ch) >> 7];
 222 }
 223
 224 jbyte
 225 java::lang::Character::getDirectionality(jint codePoint)
 226 {
 227   jint plane = codePoint >> 16;
 228   if (plane > 2 && plane != 14)
 229     {
 230       if (plane > 14 && ((codePoint & 0xffff) < 0xfffe))
 231         return (jint) PRIVATE_DIRECTION;
 232       return (jint) UNASSIGNED_DIRECTION;
 233     }
 234   return direction[plane][readCodePoint(codePoint) >> 7];
 235 }
 236
 237