1. /*
  2. * @(#)ASCII.java 1.13 03/12/19
  3. *
  4. * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
  5. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
  6. */
  7. package java.util.regex;
  8. /**
  9. * Utility class that implements the standard C ctype functionality.
  10. *
  11. * @author Hong Zhang
  12. */
  13. final class ASCII {
  14. static final int UPPER = 0x00000100;
  15. static final int LOWER = 0x00000200;
  16. static final int DIGIT = 0x00000400;
  17. static final int SPACE = 0x00000800;
  18. static final int PUNCT = 0x00001000;
  19. static final int CNTRL = 0x00002000;
  20. static final int BLANK = 0x00004000;
  21. static final int HEX = 0x00008000;
  22. static final int UNDER = 0x00010000;
  23. static final int ASCII = 0x0000FF00;
  24. static final int ALPHA = (UPPER|LOWER);
  25. static final int ALNUM = (UPPER|LOWER|DIGIT);
  26. static final int GRAPH = (PUNCT|UPPER|LOWER|DIGIT);
  27. static final int WORD = (UPPER|LOWER|UNDER|DIGIT);
  28. static final int XDIGIT = (HEX);
  29. private static final int[] ctype = new int[] {
  30. CNTRL, /* 00 (NUL) */
  31. CNTRL, /* 01 (SOH) */
  32. CNTRL, /* 02 (STX) */
  33. CNTRL, /* 03 (ETX) */
  34. CNTRL, /* 04 (EOT) */
  35. CNTRL, /* 05 (ENQ) */
  36. CNTRL, /* 06 (ACK) */
  37. CNTRL, /* 07 (BEL) */
  38. CNTRL, /* 08 (BS) */
  39. SPACE+CNTRL+BLANK, /* 09 (HT) */
  40. SPACE+CNTRL, /* 0A (LF) */
  41. SPACE+CNTRL, /* 0B (VT) */
  42. SPACE+CNTRL, /* 0C (FF) */
  43. SPACE+CNTRL, /* 0D (CR) */
  44. CNTRL, /* 0E (SI) */
  45. CNTRL, /* 0F (SO) */
  46. CNTRL, /* 10 (DLE) */
  47. CNTRL, /* 11 (DC1) */
  48. CNTRL, /* 12 (DC2) */
  49. CNTRL, /* 13 (DC3) */
  50. CNTRL, /* 14 (DC4) */
  51. CNTRL, /* 15 (NAK) */
  52. CNTRL, /* 16 (SYN) */
  53. CNTRL, /* 17 (ETB) */
  54. CNTRL, /* 18 (CAN) */
  55. CNTRL, /* 19 (EM) */
  56. CNTRL, /* 1A (SUB) */
  57. CNTRL, /* 1B (ESC) */
  58. CNTRL, /* 1C (FS) */
  59. CNTRL, /* 1D (GS) */
  60. CNTRL, /* 1E (RS) */
  61. CNTRL, /* 1F (US) */
  62. SPACE+BLANK, /* 20 SPACE */
  63. PUNCT, /* 21 ! */
  64. PUNCT, /* 22 " */
  65. PUNCT, /* 23 # */
  66. PUNCT, /* 24 $ */
  67. PUNCT, /* 25 % */
  68. PUNCT, /* 26 & */
  69. PUNCT, /* 27 ' */
  70. PUNCT, /* 28 ( */
  71. PUNCT, /* 29 ) */
  72. PUNCT, /* 2A * */
  73. PUNCT, /* 2B + */
  74. PUNCT, /* 2C , */
  75. PUNCT, /* 2D - */
  76. PUNCT, /* 2E . */
  77. PUNCT, /* 2F / */
  78. DIGIT+HEX+0, /* 30 0 */
  79. DIGIT+HEX+1, /* 31 1 */
  80. DIGIT+HEX+2, /* 32 2 */
  81. DIGIT+HEX+3, /* 33 3 */
  82. DIGIT+HEX+4, /* 34 4 */
  83. DIGIT+HEX+5, /* 35 5 */
  84. DIGIT+HEX+6, /* 36 6 */
  85. DIGIT+HEX+7, /* 37 7 */
  86. DIGIT+HEX+8, /* 38 8 */
  87. DIGIT+HEX+9, /* 39 9 */
  88. PUNCT, /* 3A : */
  89. PUNCT, /* 3B ; */
  90. PUNCT, /* 3C < */
  91. PUNCT, /* 3D = */
  92. PUNCT, /* 3E > */
  93. PUNCT, /* 3F ? */
  94. PUNCT, /* 40 @ */
  95. UPPER+HEX+10, /* 41 A */
  96. UPPER+HEX+11, /* 42 B */
  97. UPPER+HEX+12, /* 43 C */
  98. UPPER+HEX+13, /* 44 D */
  99. UPPER+HEX+14, /* 45 E */
  100. UPPER+HEX+15, /* 46 F */
  101. UPPER+16, /* 47 G */
  102. UPPER+17, /* 48 H */
  103. UPPER+18, /* 49 I */
  104. UPPER+19, /* 4A J */
  105. UPPER+20, /* 4B K */
  106. UPPER+21, /* 4C L */
  107. UPPER+22, /* 4D M */
  108. UPPER+23, /* 4E N */
  109. UPPER+24, /* 4F O */
  110. UPPER+25, /* 50 P */
  111. UPPER+26, /* 51 Q */
  112. UPPER+27, /* 52 R */
  113. UPPER+28, /* 53 S */
  114. UPPER+29, /* 54 T */
  115. UPPER+30, /* 55 U */
  116. UPPER+31, /* 56 V */
  117. UPPER+32, /* 57 W */
  118. UPPER+33, /* 58 X */
  119. UPPER+34, /* 59 Y */
  120. UPPER+35, /* 5A Z */
  121. PUNCT, /* 5B [ */
  122. PUNCT, /* 5C \ */
  123. PUNCT, /* 5D ] */
  124. PUNCT, /* 5E ^ */
  125. PUNCT|UNDER, /* 5F _ */
  126. PUNCT, /* 60 ` */
  127. LOWER+HEX+10, /* 61 a */
  128. LOWER+HEX+11, /* 62 b */
  129. LOWER+HEX+12, /* 63 c */
  130. LOWER+HEX+13, /* 64 d */
  131. LOWER+HEX+14, /* 65 e */
  132. LOWER+HEX+15, /* 66 f */
  133. LOWER+16, /* 67 g */
  134. LOWER+17, /* 68 h */
  135. LOWER+18, /* 69 i */
  136. LOWER+19, /* 6A j */
  137. LOWER+20, /* 6B k */
  138. LOWER+21, /* 6C l */
  139. LOWER+22, /* 6D m */
  140. LOWER+23, /* 6E n */
  141. LOWER+24, /* 6F o */
  142. LOWER+25, /* 70 p */
  143. LOWER+26, /* 71 q */
  144. LOWER+27, /* 72 r */
  145. LOWER+28, /* 73 s */
  146. LOWER+29, /* 74 t */
  147. LOWER+30, /* 75 u */
  148. LOWER+31, /* 76 v */
  149. LOWER+32, /* 77 w */
  150. LOWER+33, /* 78 x */
  151. LOWER+34, /* 79 y */
  152. LOWER+35, /* 7A z */
  153. PUNCT, /* 7B { */
  154. PUNCT, /* 7C | */
  155. PUNCT, /* 7D } */
  156. PUNCT, /* 7E ~ */
  157. CNTRL, /* 7F (DEL) */
  158. };
  159. static int getType(int ch) {
  160. return ((ch & 0xFFFFFF80) == 0 ? ctype[ch] : 0);
  161. }
  162. static boolean isType(int ch, int type) {
  163. return (getType(ch) & type) != 0;
  164. }
  165. static boolean isAscii(int ch) {
  166. return ((ch & 0xFFFFFF80) == 0);
  167. }
  168. static boolean isAlpha(int ch) {
  169. return isType(ch, ALPHA);
  170. }
  171. static boolean isDigit(int ch) {
  172. return ((ch-'0')|('9'-ch)) >= 0;
  173. }
  174. static boolean isAlnum(int ch) {
  175. return isType(ch, ALNUM);
  176. }
  177. static boolean isGraph(int ch) {
  178. return isType(ch, GRAPH);
  179. }
  180. static boolean isPrint(int ch) {
  181. return ((ch-0x20)|(0x7E-ch)) >= 0;
  182. }
  183. static boolean isPunct(int ch) {
  184. return isType(ch, PUNCT);
  185. }
  186. static boolean isSpace(int ch) {
  187. return isType(ch, SPACE);
  188. }
  189. static boolean isHexDigit(int ch) {
  190. return isType(ch, HEX);
  191. }
  192. static boolean isOctDigit(int ch) {
  193. return ((ch-'0')|('7'-ch)) >= 0;
  194. }
  195. static boolean isCntrl(int ch) {
  196. return isType(ch, CNTRL);
  197. }
  198. static boolean isLower(int ch) {
  199. return ((ch-'a')|('z'-ch)) >= 0;
  200. }
  201. static boolean isUpper(int ch) {
  202. return ((ch-'A')|('Z'-ch)) >= 0;
  203. }
  204. static boolean isWord(int ch) {
  205. return isType(ch, WORD);
  206. }
  207. static int toDigit(int ch) {
  208. return (ctype[ch & 0x7F] & 0x3F);
  209. }
  210. static int toLower(int ch) {
  211. return isUpper(ch) ? (ch + 0x20) : ch;
  212. }
  213. static int toUpper(int ch) {
  214. return isLower(ch) ? (ch - 0x20) : ch;
  215. }
  216. }