1 /* 2 * Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Sun designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Sun in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 22 * CA 95054 USA or visit www.sun.com if you need additional information or 23 * have any questions. 24 */ 25 26 package com.sun.tools.javac.util; 27 28 /** Utility class for static conversion methods between numbers 29 * and strings in various formats. 30 * 31 * <p><b>This is NOT part of any API supported by Sun Microsystems. If 32 * you write code that depends on this, you do so at your own risk. 33 * This code and its internal interfaces are subject to change or 34 * deletion without notice.</b> 35 */ 36 public class Convert { 37 38 /** Convert string to integer. 39 */ 40 public static int string2int(String s, int radix) 41 throws NumberFormatException { 42 if (radix == 10) { 43 return Integer.parseInt(s, radix); 44 } else { 45 char[] cs = s.toCharArray(); 46 int limit = Integer.MAX_VALUE / (radix/2); 47 int n = 0; 48 for (int i = 0; i < cs.length; i++) { 49 int d = Character.digit(cs[i], radix); 50 if (n < 0 || 51 n > limit || 52 n * radix > Integer.MAX_VALUE - d) 53 throw new NumberFormatException(); 54 n = n * radix + d; 55 } 56 return n; 57 } 58 } 59 60 /** Convert string to long integer. 61 */ 62 public static long string2long(String s, int radix) 63 throws NumberFormatException { 64 if (radix == 10) { 65 return Long.parseLong(s, radix); 66 } else { 67 char[] cs = s.toCharArray(); 68 long limit = Long.MAX_VALUE / (radix/2); 69 long n = 0; 70 for (int i = 0; i < cs.length; i++) { 71 int d = Character.digit(cs[i], radix); 72 if (n < 0 || 73 n > limit || 74 n * radix > Long.MAX_VALUE - d) 75 throw new NumberFormatException(); 76 n = n * radix + d; 77 } 78 return n; 79 } 80 } 81 82 /* Conversion routines between names, strings, and byte arrays in Utf8 format 83 */ 84 85 /** Convert `len' bytes from utf8 to characters. 86 * Parameters are as in System.arraycopy 87 * Return first index in `dst' past the last copied char. 88 * @param src The array holding the bytes to convert. 89 * @param sindex The start index from which bytes are converted. 90 * @param dst The array holding the converted characters.. 91 * @param dindex The start index from which converted characters 92 * are written. 93 * @param len The maximum number of bytes to convert. 94 */ 95 public static int utf2chars(byte[] src, int sindex, 96 char[] dst, int dindex, 97 int len) { 98 int i = sindex; 99 int j = dindex; 100 int limit = sindex + len; 101 while (i < limit) { 102 int b = src[i++] & 0xFF; 103 if (b >= 0xE0) { 104 b = (b & 0x0F) << 12; 105 b = b | (src[i++] & 0x3F) << 6; 106 b = b | (src[i++] & 0x3F); 107 } else if (b >= 0xC0) { 108 b = (b & 0x1F) << 6; 109 b = b | (src[i++] & 0x3F); 110 } 111 dst[j++] = (char)b; 112 } 113 return j; 114 } 115 116 /** Return bytes in Utf8 representation as an array of characters. 117 * @param src The array holding the bytes. 118 * @param sindex The start index from which bytes are converted. 119 * @param len The maximum number of bytes to convert. 120 */ 121 public static char[] utf2chars(byte[] src, int sindex, int len) { 122 char[] dst = new char[len]; 123 int len1 = utf2chars(src, sindex, dst, 0, len); 124 char[] result = new char[len1]; 125 System.arraycopy(dst, 0, result, 0, len1); 126 return result; 127 } 128 129 /** Return all bytes of a given array in Utf8 representation 130 * as an array of characters. 131 * @param src The array holding the bytes. 132 */ 133 public static char[] utf2chars(byte[] src) { 134 return utf2chars(src, 0, src.length); 135 } 136 137 /** Return bytes in Utf8 representation as a string. 138 * @param src The array holding the bytes. 139 * @param sindex The start index from which bytes are converted. 140 * @param len The maximum number of bytes to convert. 141 */ 142 public static String utf2string(byte[] src, int sindex, int len) { 143 char dst[] = new char[len]; 144 int len1 = utf2chars(src, sindex, dst, 0, len); 145 return new String(dst, 0, len1); 146 } 147 148 /** Return all bytes of a given array in Utf8 representation 149 * as a string. 150 * @param src The array holding the bytes. 151 */ 152 public static String utf2string(byte[] src) { 153 return utf2string(src, 0, src.length); 154 } 155 156 /** Copy characters in source array to bytes in target array, 157 * converting them to Utf8 representation. 158 * The target array must be large enough to hold the result. 159 * returns first index in `dst' past the last copied byte. 160 * @param src The array holding the characters to convert. 161 * @param sindex The start index from which characters are converted. 162 * @param dst The array holding the converted characters.. 163 * @param dindex The start index from which converted bytes 164 * are written. 165 * @param len The maximum number of characters to convert. 166 */ 167 public static int chars2utf(char[] src, int sindex, 168 byte[] dst, int dindex, 169 int len) { 170 int j = dindex; 171 int limit = sindex + len; 172 for (int i = sindex; i < limit; i++) { 173 char ch = src[i]; 174 if (1 <= ch && ch <= 0x7F) { 175 dst[j++] = (byte)ch; 176 } else if (ch <= 0x7FF) { 177 dst[j++] = (byte)(0xC0 | (ch >> 6)); 178 dst[j++] = (byte)(0x80 | (ch & 0x3F)); 179 } else { 180 dst[j++] = (byte)(0xE0 | (ch >> 12)); 181 dst[j++] = (byte)(0x80 | ((ch >> 6) & 0x3F)); 182 dst[j++] = (byte)(0x80 | (ch & 0x3F)); 183 } 184 } 185 return j; 186 } 187 188 /** Return characters as an array of bytes in Utf8 representation. 189 * @param src The array holding the characters. 190 * @param sindex The start index from which characters are converted. 191 * @param len The maximum number of characters to convert. 192 */ 193 public static byte[] chars2utf(char[] src, int sindex, int len) { 194 byte[] dst = new byte[len * 3]; 195 int len1 = chars2utf(src, sindex, dst, 0, len); 196 byte[] result = new byte[len1]; 197 System.arraycopy(dst, 0, result, 0, len1); 198 return result; 199 } 200 201 /** Return all characters in given array as an array of bytes 202 * in Utf8 representation. 203 * @param src The array holding the characters. 204 */ 205 public static byte[] chars2utf(char[] src) { 206 return chars2utf(src, 0, src.length); 207 } 208 209 /** Return string as an array of bytes in in Utf8 representation. 210 */ 211 public static byte[] string2utf(String s) { 212 return chars2utf(s.toCharArray()); 213 } 214 215 /** 216 * Escapes each character in a string that has an escape sequence or 217 * is non-printable ASCII. Leaves non-ASCII characters alone. 218 */ 219 public static String quote(String s) { 220 StringBuilder buf = new StringBuilder(); 221 for (int i = 0; i < s.length(); i++) { 222 buf.append(quote(s.charAt(i))); 223 } 224 return buf.toString(); 225 } 226 227 /** 228 * Escapes a character if it has an escape sequence or is 229 * non-printable ASCII. Leaves non-ASCII characters alone. 230 */ 231 public static String quote(char ch) { 232 switch (ch) { 233 case '\b': return "\\b"; 234 case '\f': return "\\f"; 235 case '\n': return "\\n"; 236 case '\r': return "\\r"; 237 case '\t': return "\\t"; 238 case '\'': return "\\'"; 239 case '\"': return "\\\""; 240 case '\\': return "\\\\"; 241 default: 242 return (isPrintableAscii(ch)) 243 ? String.valueOf(ch) 244 : String.format("\\u%04x", (int) ch); 245 } 246 } 247 248 /** 249 * Is a character printable ASCII? 250 */ 251 private static boolean isPrintableAscii(char ch) { 252 return ch >= ' ' && ch <= '~'; 253 } 254 255 /** Escape all unicode characters in string. 256 */ 257 public static String escapeUnicode(String s) { 258 int len = s.length(); 259 int i = 0; 260 while (i < len) { 261 char ch = s.charAt(i); 262 if (ch > 255) { 263 StringBuffer buf = new StringBuffer(); 264 buf.append(s.substring(0, i)); 265 while (i < len) { 266 ch = s.charAt(i); 267 if (ch > 255) { 268 buf.append("\\u"); 269 buf.append(Character.forDigit((ch >> 12) % 16, 16)); 270 buf.append(Character.forDigit((ch >> 8) % 16, 16)); 271 buf.append(Character.forDigit((ch >> 4) % 16, 16)); 272 buf.append(Character.forDigit((ch ) % 16, 16)); 273 } else { 274 buf.append(ch); 275 } 276 i++; 277 } 278 s = buf.toString(); 279 } else { 280 i++; 281 } 282 } 283 return s; 284 } 285 286 /* Conversion routines for qualified name splitting 287 */ 288 /** Return the last part of a class name. 289 */ 290 public static Name shortName(Name classname) { 291 return classname.subName( 292 classname.lastIndexOf((byte)'.') + 1, classname.getByteLength()); 293 } 294 295 public static String shortName(String classname) { 296 return classname.substring(classname.lastIndexOf('.') + 1); 297 } 298 299 /** Return the package name of a class name, excluding the trailing '.', 300 * "" if not existent. 301 */ 302 public static Name packagePart(Name classname) { 303 return classname.subName(0, classname.lastIndexOf((byte)'.')); 304 } 305 306 public static String packagePart(String classname) { 307 int lastDot = classname.lastIndexOf('.'); 308 return (lastDot < 0 ? "" : classname.substring(0, lastDot)); 309 } 310 311 public static List<Name> enclosingCandidates(Name name) { 312 List<Name> names = List.nil(); 313 int index; 314 while ((index = name.lastIndexOf((byte)'$')) > 0) { 315 name = name.subName(0, index); 316 names = names.prepend(name); 317 } 318 return names; 319 } 320 }