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src/share/classes/com/sun/tools/javac/util/Convert.java@4868a36f6fd8
src/share/classes/com/sun/tools/javac/util/Convert.java
Tue, 28 Dec 2010 15:54:52 -0800
- author
- ohair
- date
- Tue, 28 Dec 2010 15:54:52 -0800
- changeset 798
- 4868a36f6fd8
- parent 581
- f2fdd52e4e87
- child 1362
- c46e0c9940d6
- permissions
- -rw-r--r--
6962318: Update copyright year
Reviewed-by: xdono
1 /*
2 * Copyright (c) 1999, 2008, Oracle and/or its affiliates. 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
26 package com.sun.tools.javac.util;
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 supported API.
32 * If 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 {
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 }
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 }
82 /* Conversion routines between names, strings, and byte arrays in Utf8 format
83 */
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
248 /**
249 * Is a character printable ASCII?
250 */
251 private static boolean isPrintableAscii(char ch) {
252 return ch >= ' ' && ch <= '~';
253 }
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 }
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 }
295 public static String shortName(String classname) {
296 return classname.substring(classname.lastIndexOf('.') + 1);
297 }
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 }
306 public static String packagePart(String classname) {
307 int lastDot = classname.lastIndexOf('.');
308 return (lastDot < 0 ? "" : classname.substring(0, lastDot));
309 }
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 }
