001: /*
002: * Copyright 1999-2006 Sun Microsystems, Inc. All Rights Reserved.
003: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004: *
005: * This code is free software; you can redistribute it and/or modify it
006: * under the terms of the GNU General Public License version 2 only, as
007: * published by the Free Software Foundation. Sun designates this
008: * particular file as subject to the "Classpath" exception as provided
009: * by Sun in the LICENSE file that accompanied this code.
010: *
011: * This code is distributed in the hope that it will be useful, but WITHOUT
012: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014: * version 2 for more details (a copy is included in the LICENSE file that
015: * accompanied this code).
016: *
017: * You should have received a copy of the GNU General Public License version
018: * 2 along with this work; if not, write to the Free Software Foundation,
019: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020: *
021: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022: * CA 95054 USA or visit www.sun.com if you need additional information or
023: * have any questions.
024: */
025:
026: package com.sun.tools.javac.util;
027:
028: /** Utility class for static conversion methods between numbers
029: * and strings in various formats.
030: *
031: * <p><b>This is NOT part of any API supported by Sun Microsystems. If
032: * you write code that depends on this, you do so at your own risk.
033: * This code and its internal interfaces are subject to change or
034: * deletion without notice.</b>
035: */
036: @Version("@(#)Convert.java 1.29 07/05/05")
037: public class Convert {
038:
039: /** Convert string to integer.
040: */
041: public static int string2int(String s, int radix)
042: throws NumberFormatException {
043: if (radix == 10) {
044: return Integer.parseInt(s, radix);
045: } else {
046: char[] cs = s.toCharArray();
047: int limit = Integer.MAX_VALUE / (radix / 2);
048: int n = 0;
049: for (int i = 0; i < cs.length; i++) {
050: int d = Character.digit(cs[i], radix);
051: if (n < 0 || n > limit
052: || n * radix > Integer.MAX_VALUE - d)
053: throw new NumberFormatException();
054: n = n * radix + d;
055: }
056: return n;
057: }
058: }
059:
060: /** Convert string to long integer.
061: */
062: public static long string2long(String s, int radix)
063: throws NumberFormatException {
064: if (radix == 10) {
065: return Long.parseLong(s, radix);
066: } else {
067: char[] cs = s.toCharArray();
068: long limit = Long.MAX_VALUE / (radix / 2);
069: long n = 0;
070: for (int i = 0; i < cs.length; i++) {
071: int d = Character.digit(cs[i], radix);
072: if (n < 0 || n > limit
073: || n * radix > Long.MAX_VALUE - d)
074: throw new NumberFormatException();
075: n = n * radix + d;
076: }
077: return n;
078: }
079: }
080:
081: /* Conversion routines between names, strings, and byte arrays in Utf8 format
082: */
083:
084: /** Convert `len' bytes from utf8 to characters.
085: * Parameters are as in System.arraycopy
086: * Return first index in `dst' past the last copied char.
087: * @param src The array holding the bytes to convert.
088: * @param sindex The start index from which bytes are converted.
089: * @param dst The array holding the converted characters..
090: * @param dindex The start index from which converted characters
091: * are written.
092: * @param len The maximum number of bytes to convert.
093: */
094: public static int utf2chars(byte[] src, int sindex, char[] dst,
095: int dindex, int len) {
096: int i = sindex;
097: int j = dindex;
098: int limit = sindex + len;
099: while (i < limit) {
100: int b = src[i++] & 0xFF;
101: if (b >= 0xE0) {
102: b = (b & 0x0F) << 12;
103: b = b | (src[i++] & 0x3F) << 6;
104: b = b | (src[i++] & 0x3F);
105: } else if (b >= 0xC0) {
106: b = (b & 0x1F) << 6;
107: b = b | (src[i++] & 0x3F);
108: }
109: dst[j++] = (char) b;
110: }
111: return j;
112: }
113:
114: /** Return bytes in Utf8 representation as an array of characters.
115: * @param src The array holding the bytes.
116: * @param sindex The start index from which bytes are converted.
117: * @param len The maximum number of bytes to convert.
118: */
119: public static char[] utf2chars(byte[] src, int sindex, int len) {
120: char[] dst = new char[len];
121: int len1 = utf2chars(src, sindex, dst, 0, len);
122: char[] result = new char[len1];
123: System.arraycopy(dst, 0, result, 0, len1);
124: return result;
125: }
126:
127: /** Return all bytes of a given array in Utf8 representation
128: * as an array of characters.
129: * @param src The array holding the bytes.
130: */
131: public static char[] utf2chars(byte[] src) {
132: return utf2chars(src, 0, src.length);
133: }
134:
135: /** Return bytes in Utf8 representation as a string.
136: * @param src The array holding the bytes.
137: * @param sindex The start index from which bytes are converted.
138: * @param len The maximum number of bytes to convert.
139: */
140: public static String utf2string(byte[] src, int sindex, int len) {
141: char dst[] = new char[len];
142: int len1 = utf2chars(src, sindex, dst, 0, len);
143: return new String(dst, 0, len1);
144: }
145:
146: /** Return all bytes of a given array in Utf8 representation
147: * as a string.
148: * @param src The array holding the bytes.
149: */
150: public static String utf2string(byte[] src) {
151: return utf2string(src, 0, src.length);
152: }
153:
154: /** Copy characters in source array to bytes in target array,
155: * converting them to Utf8 representation.
156: * The target array must be large enough to hold the result.
157: * returns first index in `dst' past the last copied byte.
158: * @param src The array holding the characters to convert.
159: * @param sindex The start index from which characters are converted.
160: * @param dst The array holding the converted characters..
161: * @param dindex The start index from which converted bytes
162: * are written.
163: * @param len The maximum number of characters to convert.
164: */
165: public static int chars2utf(char[] src, int sindex, byte[] dst,
166: int dindex, int len) {
167: int j = dindex;
168: int limit = sindex + len;
169: for (int i = sindex; i < limit; i++) {
170: char ch = src[i];
171: if (1 <= ch && ch <= 0x7F) {
172: dst[j++] = (byte) ch;
173: } else if (ch <= 0x7FF) {
174: dst[j++] = (byte) (0xC0 | (ch >> 6));
175: dst[j++] = (byte) (0x80 | (ch & 0x3F));
176: } else {
177: dst[j++] = (byte) (0xE0 | (ch >> 12));
178: dst[j++] = (byte) (0x80 | ((ch >> 6) & 0x3F));
179: dst[j++] = (byte) (0x80 | (ch & 0x3F));
180: }
181: }
182: return j;
183: }
184:
185: /** Return characters as an array of bytes in Utf8 representation.
186: * @param src The array holding the characters.
187: * @param sindex The start index from which characters are converted.
188: * @param len The maximum number of characters to convert.
189: */
190: public static byte[] chars2utf(char[] src, int sindex, int len) {
191: byte[] dst = new byte[len * 3];
192: int len1 = chars2utf(src, sindex, dst, 0, len);
193: byte[] result = new byte[len1];
194: System.arraycopy(dst, 0, result, 0, len1);
195: return result;
196: }
197:
198: /** Return all characters in given array as an array of bytes
199: * in Utf8 representation.
200: * @param src The array holding the characters.
201: */
202: public static byte[] chars2utf(char[] src) {
203: return chars2utf(src, 0, src.length);
204: }
205:
206: /** Return string as an array of bytes in in Utf8 representation.
207: */
208: public static byte[] string2utf(String s) {
209: return chars2utf(s.toCharArray());
210: }
211:
212: /**
213: * Escapes each character in a string that has an escape sequence or
214: * is non-printable ASCII. Leaves non-ASCII characters alone.
215: */
216: public static String quote(String s) {
217: StringBuilder buf = new StringBuilder();
218: for (int i = 0; i < s.length(); i++) {
219: buf.append(quote(s.charAt(i)));
220: }
221: return buf.toString();
222: }
223:
224: /**
225: * Escapes a character if it has an escape sequence or is
226: * non-printable ASCII. Leaves non-ASCII characters alone.
227: */
228: public static String quote(char ch) {
229: switch (ch) {
230: case '\b':
231: return "\\b";
232: case '\f':
233: return "\\f";
234: case '\n':
235: return "\\n";
236: case '\r':
237: return "\\r";
238: case '\t':
239: return "\\t";
240: case '\'':
241: return "\\'";
242: case '\"':
243: return "\\\"";
244: case '\\':
245: return "\\\\";
246: default:
247: return (ch > 127 || isPrintableAscii(ch)) ? String
248: .valueOf(ch) : String.format("\\%03o", (int) ch);
249: }
250: }
251:
252: /**
253: * Is a character printable ASCII?
254: */
255: private static boolean isPrintableAscii(char ch) {
256: return ch >= ' ' && ch <= '~';
257: }
258:
259: /** Escape all unicode characters in string.
260: */
261: public static String escapeUnicode(String s) {
262: int len = s.length();
263: int i = 0;
264: while (i < len) {
265: char ch = s.charAt(i);
266: if (ch > 255) {
267: StringBuffer buf = new StringBuffer();
268: buf.append(s.substring(0, i));
269: while (i < len) {
270: ch = s.charAt(i);
271: if (ch > 255) {
272: buf.append("\\u");
273: buf.append(Character.forDigit((ch >> 12) % 16,
274: 16));
275: buf.append(Character.forDigit((ch >> 8) % 16,
276: 16));
277: buf.append(Character.forDigit((ch >> 4) % 16,
278: 16));
279: buf.append(Character.forDigit((ch) % 16, 16));
280: } else {
281: buf.append(ch);
282: }
283: i++;
284: }
285: s = buf.toString();
286: } else {
287: i++;
288: }
289: }
290: return s;
291: }
292:
293: /* Conversion routines for qualified name splitting
294: */
295: /** Return the last part of a class name.
296: */
297: public static Name shortName(Name classname) {
298: return classname.subName(classname.lastIndexOf((byte) '.') + 1,
299: classname.len);
300: }
301:
302: public static String shortName(String classname) {
303: return classname.substring(classname.lastIndexOf('.') + 1);
304: }
305:
306: /** Return the package name of a class name, excluding the trailing '.',
307: * "" if not existent.
308: */
309: public static Name packagePart(Name classname) {
310: return classname.subName(0, classname.lastIndexOf((byte) '.'));
311: }
312:
313: public static String packagePart(String classname) {
314: int lastDot = classname.lastIndexOf('.');
315: return (lastDot < 0 ? "" : classname.substring(0, lastDot));
316: }
317:
318: public static List<Name> enclosingCandidates(Name name) {
319: List<Name> names = List.nil();
320: int index;
321: while ((index = name.lastIndexOf((byte) '$')) > 0) {
322: name = name.subName(0, index);
323: names = names.prepend(name);
324: }
325: return names;
326: }
327: }
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