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1 /* |
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. 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. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * 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 = $$Lookup(offset); |
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71 return props; |
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72 } |
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73 |
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74 int getPropertiesEx(int ch) { |
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75 char offset = (char)ch; |
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76 int props = $$LookupEx(offset); |
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77 return props; |
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78 } |
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79 |
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80 boolean isOtherLowercase(int ch) { |
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81 int props = getPropertiesEx(ch); |
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82 return (props & $$maskOtherLowercase) != 0; |
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83 } |
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84 |
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85 boolean isOtherUppercase(int ch) { |
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86 int props = getPropertiesEx(ch); |
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87 return (props & $$maskOtherUppercase) != 0; |
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88 } |
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89 |
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90 boolean isOtherAlphabetic(int ch) { |
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91 int props = getPropertiesEx(ch); |
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92 return (props & $$maskOtherAlphabetic) != 0; |
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93 } |
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94 |
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95 boolean isIdeographic(int ch) { |
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96 int props = getPropertiesEx(ch); |
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97 return (props & $$maskIdeographic) != 0; |
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98 } |
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99 |
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100 int getType(int ch) { |
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101 int props = getProperties(ch); |
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102 return (props & $$maskType); |
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103 } |
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104 |
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105 boolean isJavaIdentifierStart(int ch) { |
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106 int props = getProperties(ch); |
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107 return ((props & $$maskIdentifierInfo) >= $$lowJavaStart); |
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108 } |
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109 |
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110 boolean isJavaIdentifierPart(int ch) { |
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111 int props = getProperties(ch); |
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112 return ((props & $$nonzeroJavaPart) != 0); |
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113 } |
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114 |
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115 boolean isUnicodeIdentifierStart(int ch) { |
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116 int props = getProperties(ch); |
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117 return ((props & $$maskIdentifierInfo) == $$valueUnicodeStart); |
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118 } |
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119 |
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120 boolean isUnicodeIdentifierPart(int ch) { |
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121 int props = getProperties(ch); |
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122 return ((props & $$maskUnicodePart) != 0); |
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123 } |
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124 |
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125 boolean isIdentifierIgnorable(int ch) { |
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126 int props = getProperties(ch); |
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127 return ((props & $$maskIdentifierInfo) == $$valueIgnorable); |
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128 } |
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129 |
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130 int toLowerCase(int ch) { |
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131 int mapChar = ch; |
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132 int val = getProperties(ch); |
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133 |
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134 if ((val & $$maskLowerCase) != 0) { |
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135 int offset = val << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset); |
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136 mapChar = ch + offset; |
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137 } |
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138 return mapChar; |
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139 } |
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140 |
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141 int toUpperCase(int ch) { |
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142 int mapChar = ch; |
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143 int val = getProperties(ch); |
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144 |
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145 if ((val & $$maskUpperCase) != 0) { |
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146 int offset = val << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset); |
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147 mapChar = ch - offset; |
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148 } |
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149 return mapChar; |
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150 } |
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151 |
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152 int toTitleCase(int ch) { |
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153 int mapChar = ch; |
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154 int val = getProperties(ch); |
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155 |
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156 if ((val & $$maskTitleCase) != 0) { |
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157 // There is a titlecase equivalent. Perform further checks: |
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158 if ((val & $$maskUpperCase) == 0) { |
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159 // The character does not have an uppercase equivalent, so it must |
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160 // already be uppercase; so add 1 to get the titlecase form. |
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161 mapChar = ch + 1; |
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162 } |
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163 else if ((val & $$maskLowerCase) == 0) { |
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164 // The character does not have a lowercase equivalent, so it must |
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165 // already be lowercase; so subtract 1 to get the titlecase form. |
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166 mapChar = ch - 1; |
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167 } |
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168 // else { |
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169 // The character has both an uppercase equivalent and a lowercase |
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170 // equivalent, so it must itself be a titlecase form; return it. |
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171 // return ch; |
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172 //} |
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173 } |
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174 else if ((val & $$maskUpperCase) != 0) { |
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175 // This character has no titlecase equivalent but it does have an |
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176 // uppercase equivalent, so use that (subtract the signed case offset). |
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177 mapChar = toUpperCase(ch); |
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178 } |
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179 return mapChar; |
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180 } |
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181 |
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182 int digit(int ch, int radix) { |
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183 int value = -1; |
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184 if (radix >= Character.MIN_RADIX && radix <= Character.MAX_RADIX) { |
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185 int val = getProperties(ch); |
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186 int kind = val & $$maskType; |
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187 if (kind == Character.DECIMAL_DIGIT_NUMBER) { |
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188 value = ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit; |
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189 } |
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190 else if ((val & $$maskNumericType) == $$valueJavaSupradecimal) { |
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191 // Java supradecimal digit |
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192 value = (ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit) + 10; |
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193 } |
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194 } |
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195 return (value < radix) ? value : -1; |
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196 } |
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197 |
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198 int getNumericValue(int ch) { |
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199 int val = getProperties(ch); |
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200 int retval = -1; |
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201 |
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202 switch (val & $$maskNumericType) { |
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203 default: // cannot occur |
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204 case ($$valueNotNumeric): // not numeric |
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205 retval = -1; |
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206 break; |
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207 case ($$valueDigit): // simple numeric |
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208 retval = ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit; |
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209 break; |
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210 case ($$valueStrangeNumeric) : // "strange" numeric |
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211 retval = -2; |
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212 break; |
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213 case ($$valueJavaSupradecimal): // Java supradecimal |
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214 retval = (ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit) + 10; |
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215 break; |
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216 } |
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217 return retval; |
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218 } |
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219 |
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220 boolean isWhitespace(int ch) { |
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221 int props = getProperties(ch); |
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222 return ((props & $$maskIdentifierInfo) == $$valueJavaWhitespace); |
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223 } |
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224 |
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225 byte getDirectionality(int ch) { |
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226 int val = getProperties(ch); |
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227 byte directionality = (byte)((val & $$maskBidi) >> $$shiftBidi); |
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228 if (directionality == 0xF ) { |
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229 directionality = Character.DIRECTIONALITY_UNDEFINED; |
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230 } |
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231 return directionality; |
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232 } |
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233 |
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234 boolean isMirrored(int ch) { |
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235 int props = getProperties(ch); |
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236 return ((props & $$maskMirrored) != 0); |
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237 } |
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238 |
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239 static final CharacterData instance = new CharacterData0E(); |
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240 private CharacterData0E() {}; |
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241 |
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242 $$Tables |
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243 |
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244 static { |
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245 $$Initializers |
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246 } |
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247 } |