Java example source code file (ASCII.java)
The ASCII.java Java example source code
/*
* Copyright (c) 1999, 2000, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.util.regex;
/**
* Utility class that implements the standard C ctype functionality.
*
* @author Hong Zhang
*/
final class ASCII {
static final int UPPER = 0x00000100;
static final int LOWER = 0x00000200;
static final int DIGIT = 0x00000400;
static final int SPACE = 0x00000800;
static final int PUNCT = 0x00001000;
static final int CNTRL = 0x00002000;
static final int BLANK = 0x00004000;
static final int HEX = 0x00008000;
static final int UNDER = 0x00010000;
static final int ASCII = 0x0000FF00;
static final int ALPHA = (UPPER|LOWER);
static final int ALNUM = (UPPER|LOWER|DIGIT);
static final int GRAPH = (PUNCT|UPPER|LOWER|DIGIT);
static final int WORD = (UPPER|LOWER|UNDER|DIGIT);
static final int XDIGIT = (HEX);
private static final int[] ctype = new int[] {
CNTRL, /* 00 (NUL) */
CNTRL, /* 01 (SOH) */
CNTRL, /* 02 (STX) */
CNTRL, /* 03 (ETX) */
CNTRL, /* 04 (EOT) */
CNTRL, /* 05 (ENQ) */
CNTRL, /* 06 (ACK) */
CNTRL, /* 07 (BEL) */
CNTRL, /* 08 (BS) */
SPACE+CNTRL+BLANK, /* 09 (HT) */
SPACE+CNTRL, /* 0A (LF) */
SPACE+CNTRL, /* 0B (VT) */
SPACE+CNTRL, /* 0C (FF) */
SPACE+CNTRL, /* 0D (CR) */
CNTRL, /* 0E (SI) */
CNTRL, /* 0F (SO) */
CNTRL, /* 10 (DLE) */
CNTRL, /* 11 (DC1) */
CNTRL, /* 12 (DC2) */
CNTRL, /* 13 (DC3) */
CNTRL, /* 14 (DC4) */
CNTRL, /* 15 (NAK) */
CNTRL, /* 16 (SYN) */
CNTRL, /* 17 (ETB) */
CNTRL, /* 18 (CAN) */
CNTRL, /* 19 (EM) */
CNTRL, /* 1A (SUB) */
CNTRL, /* 1B (ESC) */
CNTRL, /* 1C (FS) */
CNTRL, /* 1D (GS) */
CNTRL, /* 1E (RS) */
CNTRL, /* 1F (US) */
SPACE+BLANK, /* 20 SPACE */
PUNCT, /* 21 ! */
PUNCT, /* 22 " */
PUNCT, /* 23 # */
PUNCT, /* 24 $ */
PUNCT, /* 25 % */
PUNCT, /* 26 & */
PUNCT, /* 27 ' */
PUNCT, /* 28 ( */
PUNCT, /* 29 ) */
PUNCT, /* 2A * */
PUNCT, /* 2B + */
PUNCT, /* 2C , */
PUNCT, /* 2D - */
PUNCT, /* 2E . */
PUNCT, /* 2F / */
DIGIT+HEX+0, /* 30 0 */
DIGIT+HEX+1, /* 31 1 */
DIGIT+HEX+2, /* 32 2 */
DIGIT+HEX+3, /* 33 3 */
DIGIT+HEX+4, /* 34 4 */
DIGIT+HEX+5, /* 35 5 */
DIGIT+HEX+6, /* 36 6 */
DIGIT+HEX+7, /* 37 7 */
DIGIT+HEX+8, /* 38 8 */
DIGIT+HEX+9, /* 39 9 */
PUNCT, /* 3A : */
PUNCT, /* 3B ; */
PUNCT, /* 3C < */
PUNCT, /* 3D = */
PUNCT, /* 3E > */
PUNCT, /* 3F ? */
PUNCT, /* 40 @ */
UPPER+HEX+10, /* 41 A */
UPPER+HEX+11, /* 42 B */
UPPER+HEX+12, /* 43 C */
UPPER+HEX+13, /* 44 D */
UPPER+HEX+14, /* 45 E */
UPPER+HEX+15, /* 46 F */
UPPER+16, /* 47 G */
UPPER+17, /* 48 H */
UPPER+18, /* 49 I */
UPPER+19, /* 4A J */
UPPER+20, /* 4B K */
UPPER+21, /* 4C L */
UPPER+22, /* 4D M */
UPPER+23, /* 4E N */
UPPER+24, /* 4F O */
UPPER+25, /* 50 P */
UPPER+26, /* 51 Q */
UPPER+27, /* 52 R */
UPPER+28, /* 53 S */
UPPER+29, /* 54 T */
UPPER+30, /* 55 U */
UPPER+31, /* 56 V */
UPPER+32, /* 57 W */
UPPER+33, /* 58 X */
UPPER+34, /* 59 Y */
UPPER+35, /* 5A Z */
PUNCT, /* 5B [ */
PUNCT, /* 5C \ */
PUNCT, /* 5D ] */
PUNCT, /* 5E ^ */
PUNCT|UNDER, /* 5F _ */
PUNCT, /* 60 ` */
LOWER+HEX+10, /* 61 a */
LOWER+HEX+11, /* 62 b */
LOWER+HEX+12, /* 63 c */
LOWER+HEX+13, /* 64 d */
LOWER+HEX+14, /* 65 e */
LOWER+HEX+15, /* 66 f */
LOWER+16, /* 67 g */
LOWER+17, /* 68 h */
LOWER+18, /* 69 i */
LOWER+19, /* 6A j */
LOWER+20, /* 6B k */
LOWER+21, /* 6C l */
LOWER+22, /* 6D m */
LOWER+23, /* 6E n */
LOWER+24, /* 6F o */
LOWER+25, /* 70 p */
LOWER+26, /* 71 q */
LOWER+27, /* 72 r */
LOWER+28, /* 73 s */
LOWER+29, /* 74 t */
LOWER+30, /* 75 u */
LOWER+31, /* 76 v */
LOWER+32, /* 77 w */
LOWER+33, /* 78 x */
LOWER+34, /* 79 y */
LOWER+35, /* 7A z */
PUNCT, /* 7B { */
PUNCT, /* 7C | */
PUNCT, /* 7D } */
PUNCT, /* 7E ~ */
CNTRL, /* 7F (DEL) */
};
static int getType(int ch) {
return ((ch & 0xFFFFFF80) == 0 ? ctype[ch] : 0);
}
static boolean isType(int ch, int type) {
return (getType(ch) & type) != 0;
}
static boolean isAscii(int ch) {
return ((ch & 0xFFFFFF80) == 0);
}
static boolean isAlpha(int ch) {
return isType(ch, ALPHA);
}
static boolean isDigit(int ch) {
return ((ch-'0')|('9'-ch)) >= 0;
}
static boolean isAlnum(int ch) {
return isType(ch, ALNUM);
}
static boolean isGraph(int ch) {
return isType(ch, GRAPH);
}
static boolean isPrint(int ch) {
return ((ch-0x20)|(0x7E-ch)) >= 0;
}
static boolean isPunct(int ch) {
return isType(ch, PUNCT);
}
static boolean isSpace(int ch) {
return isType(ch, SPACE);
}
static boolean isHexDigit(int ch) {
return isType(ch, HEX);
}
static boolean isOctDigit(int ch) {
return ((ch-'0')|('7'-ch)) >= 0;
}
static boolean isCntrl(int ch) {
return isType(ch, CNTRL);
}
static boolean isLower(int ch) {
return ((ch-'a')|('z'-ch)) >= 0;
}
static boolean isUpper(int ch) {
return ((ch-'A')|('Z'-ch)) >= 0;
}
static boolean isWord(int ch) {
return isType(ch, WORD);
}
static int toDigit(int ch) {
return (ctype[ch & 0x7F] & 0x3F);
}
static int toLower(int ch) {
return isUpper(ch) ? (ch + 0x20) : ch;
}
static int toUpper(int ch) {
return isLower(ch) ? (ch - 0x20) : ch;
}
}
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