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1 /* |
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2 * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Sun designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Sun in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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22 * CA 95054 USA or visit www.sun.com if you need additional information or |
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23 * have any questions. |
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24 */ |
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25 |
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26 package java.lang; |
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27 |
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28 /** The CharacterData class encapsulates the large tables found in |
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29 Java.lang.Character. */ |
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30 |
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31 class CharacterData0E extends CharacterData { |
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32 /* The character properties are currently encoded into 32 bits in the following manner: |
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33 1 bit mirrored property |
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34 4 bits directionality property |
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35 9 bits signed offset used for converting case |
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36 1 bit if 1, adding the signed offset converts the character to lowercase |
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37 1 bit if 1, subtracting the signed offset converts the character to uppercase |
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38 1 bit if 1, this character has a titlecase equivalent (possibly itself) |
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39 3 bits 0 may not be part of an identifier |
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40 1 ignorable control; may continue a Unicode identifier or Java identifier |
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41 2 may continue a Java identifier but not a Unicode identifier (unused) |
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42 3 may continue a Unicode identifier or Java identifier |
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43 4 is a Java whitespace character |
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44 5 may start or continue a Java identifier; |
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45 may continue but not start a Unicode identifier (underscores) |
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46 6 may start or continue a Java identifier but not a Unicode identifier ($) |
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47 7 may start or continue a Unicode identifier or Java identifier |
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48 Thus: |
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49 5, 6, 7 may start a Java identifier |
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50 1, 2, 3, 5, 6, 7 may continue a Java identifier |
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51 7 may start a Unicode identifier |
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52 1, 3, 5, 7 may continue a Unicode identifier |
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53 1 is ignorable within an identifier |
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54 4 is Java whitespace |
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55 2 bits 0 this character has no numeric property |
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56 1 adding the digit offset to the character code and then |
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57 masking with 0x1F will produce the desired numeric value |
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58 2 this character has a "strange" numeric value |
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59 3 a Java supradecimal digit: adding the digit offset to the |
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60 character code, then masking with 0x1F, then adding 10 |
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61 will produce the desired numeric value |
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62 5 bits digit offset |
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63 5 bits character type |
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64 |
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65 The encoding of character properties is subject to change at any time. |
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66 */ |
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67 |
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68 int getProperties(int ch) { |
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69 char offset = (char)ch; |
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70 int props = $$Lookup(offset); |
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71 return props; |
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72 } |
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73 |
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74 int getType(int ch) { |
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75 int props = getProperties(ch); |
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76 return (props & $$maskType); |
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77 } |
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78 |
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79 boolean isJavaIdentifierStart(int ch) { |
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80 int props = getProperties(ch); |
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81 return ((props & $$maskIdentifierInfo) >= $$lowJavaStart); |
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82 } |
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83 |
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84 boolean isJavaIdentifierPart(int ch) { |
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85 int props = getProperties(ch); |
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86 return ((props & $$nonzeroJavaPart) != 0); |
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87 } |
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88 |
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89 boolean isUnicodeIdentifierStart(int ch) { |
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90 int props = getProperties(ch); |
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91 return ((props & $$maskIdentifierInfo) == $$valueUnicodeStart); |
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92 } |
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93 |
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94 boolean isUnicodeIdentifierPart(int ch) { |
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95 int props = getProperties(ch); |
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96 return ((props & $$maskUnicodePart) != 0); |
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97 } |
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98 |
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99 boolean isIdentifierIgnorable(int ch) { |
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100 int props = getProperties(ch); |
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101 return ((props & $$maskIdentifierInfo) == $$valueIgnorable); |
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102 } |
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103 |
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104 int toLowerCase(int ch) { |
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105 int mapChar = ch; |
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106 int val = getProperties(ch); |
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107 |
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108 if ((val & $$maskLowerCase) != 0) { |
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109 int offset = val << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset); |
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110 mapChar = ch + offset; |
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111 } |
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112 return mapChar; |
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113 } |
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114 |
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115 int toUpperCase(int ch) { |
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116 int mapChar = ch; |
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117 int val = getProperties(ch); |
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118 |
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119 if ((val & $$maskUpperCase) != 0) { |
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120 int offset = val << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset); |
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121 mapChar = ch - offset; |
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122 } |
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123 return mapChar; |
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124 } |
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125 |
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126 int toTitleCase(int ch) { |
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127 int mapChar = ch; |
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128 int val = getProperties(ch); |
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129 |
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130 if ((val & $$maskTitleCase) != 0) { |
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131 // There is a titlecase equivalent. Perform further checks: |
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132 if ((val & $$maskUpperCase) == 0) { |
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133 // The character does not have an uppercase equivalent, so it must |
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134 // already be uppercase; so add 1 to get the titlecase form. |
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135 mapChar = ch + 1; |
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136 } |
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137 else if ((val & $$maskLowerCase) == 0) { |
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138 // The character does not have a lowercase equivalent, so it must |
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139 // already be lowercase; so subtract 1 to get the titlecase form. |
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140 mapChar = ch - 1; |
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141 } |
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142 // else { |
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143 // The character has both an uppercase equivalent and a lowercase |
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144 // equivalent, so it must itself be a titlecase form; return it. |
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145 // return ch; |
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146 //} |
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147 } |
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148 else if ((val & $$maskUpperCase) != 0) { |
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149 // This character has no titlecase equivalent but it does have an |
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150 // uppercase equivalent, so use that (subtract the signed case offset). |
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151 mapChar = toUpperCase(ch); |
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152 } |
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153 return mapChar; |
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154 } |
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155 |
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156 int digit(int ch, int radix) { |
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157 int value = -1; |
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158 if (radix >= Character.MIN_RADIX && radix <= Character.MAX_RADIX) { |
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159 int val = getProperties(ch); |
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160 int kind = val & $$maskType; |
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161 if (kind == Character.DECIMAL_DIGIT_NUMBER) { |
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162 value = ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit; |
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163 } |
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164 else if ((val & $$maskNumericType) == $$valueJavaSupradecimal) { |
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165 // Java supradecimal digit |
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166 value = (ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit) + 10; |
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167 } |
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168 } |
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169 return (value < radix) ? value : -1; |
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170 } |
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171 |
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172 int getNumericValue(int ch) { |
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173 int val = getProperties(ch); |
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174 int retval = -1; |
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175 |
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176 switch (val & $$maskNumericType) { |
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177 default: // cannot occur |
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178 case ($$valueNotNumeric): // not numeric |
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179 retval = -1; |
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180 break; |
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181 case ($$valueDigit): // simple numeric |
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182 retval = ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit; |
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183 break; |
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184 case ($$valueStrangeNumeric) : // "strange" numeric |
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185 retval = -2; |
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186 break; |
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187 case ($$valueJavaSupradecimal): // Java supradecimal |
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188 retval = (ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit) + 10; |
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189 break; |
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190 } |
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191 return retval; |
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192 } |
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193 |
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194 boolean isWhitespace(int ch) { |
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195 int props = getProperties(ch); |
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196 return ((props & $$maskIdentifierInfo) == $$valueJavaWhitespace); |
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197 } |
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198 |
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199 byte getDirectionality(int ch) { |
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200 int val = getProperties(ch); |
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201 byte directionality = (byte)((val & $$maskBidi) >> $$shiftBidi); |
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202 if (directionality == 0xF ) { |
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203 directionality = Character.DIRECTIONALITY_UNDEFINED; |
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204 } |
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205 return directionality; |
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206 } |
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207 |
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208 boolean isMirrored(int ch) { |
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209 int props = getProperties(ch); |
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210 return ((props & $$maskMirrored) != 0); |
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211 } |
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212 |
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213 static final CharacterData instance = new CharacterData0E(); |
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214 private CharacterData0E() {}; |
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215 |
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216 $$Tables |
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217 |
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218 static { |
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219 $$Initializers |
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220 } |
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221 } |