duke@1: /*
ohair@554:  * Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved.
duke@1:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@1:  *
duke@1:  * This code is free software; you can redistribute it and/or modify it
duke@1:  * under the terms of the GNU General Public License version 2 only, as
ohair@554:  * published by the Free Software Foundation.  Oracle designates this
duke@1:  * particular file as subject to the "Classpath" exception as provided
ohair@554:  * by Oracle in the LICENSE file that accompanied this code.
duke@1:  *
duke@1:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@1:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@1:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@1:  * version 2 for more details (a copy is included in the LICENSE file that
duke@1:  * accompanied this code).
duke@1:  *
duke@1:  * You should have received a copy of the GNU General Public License version
duke@1:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@1:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@1:  *
ohair@554:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@554:  * or visit www.oracle.com if you need additional information or have any
ohair@554:  * questions.
duke@1:  */
duke@1: 
duke@1: package com.sun.tools.javac.util;
duke@1: 
duke@1: /** Utility class for static conversion methods between numbers
duke@1:  *  and strings in various formats.
duke@1:  *
jjg@581:  *  <p><b>This is NOT part of any supported API.
jjg@581:  *  If you write code that depends on this, you do so at your own risk.
duke@1:  *  This code and its internal interfaces are subject to change or
duke@1:  *  deletion without notice.</b>
duke@1:  */
duke@1: public class Convert {
duke@1: 
duke@1:     /** Convert string to integer.
duke@1:      */
duke@1:     public static int string2int(String s, int radix)
duke@1:         throws NumberFormatException {
duke@1:         if (radix == 10) {
duke@1:             return Integer.parseInt(s, radix);
duke@1:         } else {
duke@1:             char[] cs = s.toCharArray();
duke@1:             int limit = Integer.MAX_VALUE / (radix/2);
duke@1:             int n = 0;
duke@1:             for (int i = 0; i < cs.length; i++) {
duke@1:                 int d = Character.digit(cs[i], radix);
duke@1:                 if (n < 0 ||
duke@1:                     n > limit ||
duke@1:                     n * radix > Integer.MAX_VALUE - d)
duke@1:                     throw new NumberFormatException();
duke@1:                 n = n * radix + d;
duke@1:             }
duke@1:             return n;
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     /** Convert string to long integer.
duke@1:      */
duke@1:     public static long string2long(String s, int radix)
duke@1:         throws NumberFormatException {
duke@1:         if (radix == 10) {
duke@1:             return Long.parseLong(s, radix);
duke@1:         } else {
duke@1:             char[] cs = s.toCharArray();
duke@1:             long limit = Long.MAX_VALUE / (radix/2);
duke@1:             long n = 0;
duke@1:             for (int i = 0; i < cs.length; i++) {
duke@1:                 int d = Character.digit(cs[i], radix);
duke@1:                 if (n < 0 ||
duke@1:                     n > limit ||
duke@1:                     n * radix > Long.MAX_VALUE - d)
duke@1:                     throw new NumberFormatException();
duke@1:                 n = n * radix + d;
duke@1:             }
duke@1:             return n;
duke@1:         }
duke@1:     }
duke@1: 
duke@1: /* Conversion routines between names, strings, and byte arrays in Utf8 format
duke@1:  */
duke@1: 
duke@1:     /** Convert `len' bytes from utf8 to characters.
duke@1:      *  Parameters are as in System.arraycopy
duke@1:      *  Return first index in `dst' past the last copied char.
duke@1:      *  @param src        The array holding the bytes to convert.
duke@1:      *  @param sindex     The start index from which bytes are converted.
duke@1:      *  @param dst        The array holding the converted characters..
duke@1:      *  @param dindex     The start index from which converted characters
duke@1:      *                    are written.
duke@1:      *  @param len        The maximum number of bytes to convert.
duke@1:      */
duke@1:     public static int utf2chars(byte[] src, int sindex,
duke@1:                                 char[] dst, int dindex,
duke@1:                                 int len) {
duke@1:         int i = sindex;
duke@1:         int j = dindex;
duke@1:         int limit = sindex + len;
duke@1:         while (i < limit) {
duke@1:             int b = src[i++] & 0xFF;
duke@1:             if (b >= 0xE0) {
duke@1:                 b = (b & 0x0F) << 12;
duke@1:                 b = b | (src[i++] & 0x3F) << 6;
duke@1:                 b = b | (src[i++] & 0x3F);
duke@1:             } else if (b >= 0xC0) {
duke@1:                 b = (b & 0x1F) << 6;
duke@1:                 b = b | (src[i++] & 0x3F);
duke@1:             }
duke@1:             dst[j++] = (char)b;
duke@1:         }
duke@1:         return j;
duke@1:     }
duke@1: 
duke@1:     /** Return bytes in Utf8 representation as an array of characters.
duke@1:      *  @param src        The array holding the bytes.
duke@1:      *  @param sindex     The start index from which bytes are converted.
duke@1:      *  @param len        The maximum number of bytes to convert.
duke@1:      */
duke@1:     public static char[] utf2chars(byte[] src, int sindex, int len) {
duke@1:         char[] dst = new char[len];
duke@1:         int len1 = utf2chars(src, sindex, dst, 0, len);
duke@1:         char[] result = new char[len1];
duke@1:         System.arraycopy(dst, 0, result, 0, len1);
duke@1:         return result;
duke@1:     }
duke@1: 
duke@1:     /** Return all bytes of a given array in Utf8 representation
duke@1:      *  as an array of characters.
duke@1:      *  @param src        The array holding the bytes.
duke@1:      */
duke@1:     public static char[] utf2chars(byte[] src) {
duke@1:         return utf2chars(src, 0, src.length);
duke@1:     }
duke@1: 
duke@1:     /** Return bytes in Utf8 representation as a string.
duke@1:      *  @param src        The array holding the bytes.
duke@1:      *  @param sindex     The start index from which bytes are converted.
duke@1:      *  @param len        The maximum number of bytes to convert.
duke@1:      */
duke@1:     public static String utf2string(byte[] src, int sindex, int len) {
duke@1:         char dst[] = new char[len];
duke@1:         int len1 = utf2chars(src, sindex, dst, 0, len);
duke@1:         return new String(dst, 0, len1);
duke@1:     }
duke@1: 
duke@1:     /** Return all bytes of a given array in Utf8 representation
duke@1:      *  as a string.
duke@1:      *  @param src        The array holding the bytes.
duke@1:      */
duke@1:     public static String utf2string(byte[] src) {
duke@1:         return utf2string(src, 0, src.length);
duke@1:     }
duke@1: 
duke@1:     /** Copy characters in source array to bytes in target array,
duke@1:      *  converting them to Utf8 representation.
duke@1:      *  The target array must be large enough to hold the result.
duke@1:      *  returns first index in `dst' past the last copied byte.
duke@1:      *  @param src        The array holding the characters to convert.
duke@1:      *  @param sindex     The start index from which characters are converted.
duke@1:      *  @param dst        The array holding the converted characters..
duke@1:      *  @param dindex     The start index from which converted bytes
duke@1:      *                    are written.
duke@1:      *  @param len        The maximum number of characters to convert.
duke@1:      */
duke@1:     public static int chars2utf(char[] src, int sindex,
duke@1:                                 byte[] dst, int dindex,
duke@1:                                 int len) {
duke@1:         int j = dindex;
duke@1:         int limit = sindex + len;
duke@1:         for (int i = sindex; i < limit; i++) {
duke@1:             char ch = src[i];
duke@1:             if (1 <= ch && ch <= 0x7F) {
duke@1:                 dst[j++] = (byte)ch;
duke@1:             } else if (ch <= 0x7FF) {
duke@1:                 dst[j++] = (byte)(0xC0 | (ch >> 6));
duke@1:                 dst[j++] = (byte)(0x80 | (ch & 0x3F));
duke@1:             } else {
duke@1:                 dst[j++] = (byte)(0xE0 | (ch >> 12));
duke@1:                 dst[j++] = (byte)(0x80 | ((ch >> 6) & 0x3F));
duke@1:                 dst[j++] = (byte)(0x80 | (ch & 0x3F));
duke@1:             }
duke@1:         }
duke@1:         return j;
duke@1:     }
duke@1: 
duke@1:     /** Return characters as an array of bytes in Utf8 representation.
duke@1:      *  @param src        The array holding the characters.
duke@1:      *  @param sindex     The start index from which characters are converted.
duke@1:      *  @param len        The maximum number of characters to convert.
duke@1:      */
duke@1:     public static byte[] chars2utf(char[] src, int sindex, int len) {
duke@1:         byte[] dst = new byte[len * 3];
duke@1:         int len1 = chars2utf(src, sindex, dst, 0, len);
duke@1:         byte[] result = new byte[len1];
duke@1:         System.arraycopy(dst, 0, result, 0, len1);
duke@1:         return result;
duke@1:     }
duke@1: 
duke@1:     /** Return all characters in given array as an array of bytes
duke@1:      *  in Utf8 representation.
duke@1:      *  @param src        The array holding the characters.
duke@1:      */
duke@1:     public static byte[] chars2utf(char[] src) {
duke@1:         return chars2utf(src, 0, src.length);
duke@1:     }
duke@1: 
duke@1:     /** Return string as an array of bytes in in Utf8 representation.
duke@1:      */
duke@1:     public static byte[] string2utf(String s) {
duke@1:         return chars2utf(s.toCharArray());
duke@1:     }
duke@1: 
duke@1:     /**
duke@1:      * Escapes each character in a string that has an escape sequence or
duke@1:      * is non-printable ASCII.  Leaves non-ASCII characters alone.
duke@1:      */
duke@1:     public static String quote(String s) {
duke@1:         StringBuilder buf = new StringBuilder();
duke@1:         for (int i = 0; i < s.length(); i++) {
duke@1:             buf.append(quote(s.charAt(i)));
duke@1:         }
duke@1:         return buf.toString();
duke@1:     }
duke@1: 
duke@1:     /**
duke@1:      * Escapes a character if it has an escape sequence or is
duke@1:      * non-printable ASCII.  Leaves non-ASCII characters alone.
duke@1:      */
duke@1:     public static String quote(char ch) {
duke@1:         switch (ch) {
duke@1:         case '\b':  return "\\b";
duke@1:         case '\f':  return "\\f";
duke@1:         case '\n':  return "\\n";
duke@1:         case '\r':  return "\\r";
duke@1:         case '\t':  return "\\t";
duke@1:         case '\'':  return "\\'";
duke@1:         case '\"':  return "\\\"";
duke@1:         case '\\':  return "\\\\";
duke@1:         default:
darcy@414:             return (isPrintableAscii(ch))
duke@1:                 ? String.valueOf(ch)
darcy@414:                 : String.format("\\u%04x", (int) ch);
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     /**
duke@1:      * Is a character printable ASCII?
duke@1:      */
duke@1:     private static boolean isPrintableAscii(char ch) {
duke@1:         return ch >= ' ' && ch <= '~';
duke@1:     }
duke@1: 
duke@1:     /** Escape all unicode characters in string.
duke@1:      */
duke@1:     public static String escapeUnicode(String s) {
duke@1:         int len = s.length();
duke@1:         int i = 0;
duke@1:         while (i < len) {
duke@1:             char ch = s.charAt(i);
duke@1:             if (ch > 255) {
duke@1:                 StringBuffer buf = new StringBuffer();
duke@1:                 buf.append(s.substring(0, i));
duke@1:                 while (i < len) {
duke@1:                     ch = s.charAt(i);
duke@1:                     if (ch > 255) {
duke@1:                         buf.append("\\u");
duke@1:                         buf.append(Character.forDigit((ch >> 12) % 16, 16));
duke@1:                         buf.append(Character.forDigit((ch >>  8) % 16, 16));
duke@1:                         buf.append(Character.forDigit((ch >>  4) % 16, 16));
duke@1:                         buf.append(Character.forDigit((ch      ) % 16, 16));
duke@1:                     } else {
duke@1:                         buf.append(ch);
duke@1:                     }
duke@1:                     i++;
duke@1:                 }
duke@1:                 s = buf.toString();
duke@1:             } else {
duke@1:                 i++;
duke@1:             }
duke@1:         }
duke@1:         return s;
duke@1:     }
duke@1: 
duke@1: /* Conversion routines for qualified name splitting
duke@1:  */
duke@1:     /** Return the last part of a class name.
duke@1:      */
duke@1:     public static Name shortName(Name classname) {
duke@1:         return classname.subName(
jjg@113:             classname.lastIndexOf((byte)'.') + 1, classname.getByteLength());
duke@1:     }
duke@1: 
duke@1:     public static String shortName(String classname) {
duke@1:         return classname.substring(classname.lastIndexOf('.') + 1);
duke@1:     }
duke@1: 
duke@1:     /** Return the package name of a class name, excluding the trailing '.',
duke@1:      *  "" if not existent.
duke@1:      */
duke@1:     public static Name packagePart(Name classname) {
duke@1:         return classname.subName(0, classname.lastIndexOf((byte)'.'));
duke@1:     }
duke@1: 
duke@1:     public static String packagePart(String classname) {
duke@1:         int lastDot = classname.lastIndexOf('.');
duke@1:         return (lastDot < 0 ? "" : classname.substring(0, lastDot));
duke@1:     }
duke@1: 
duke@1:     public static List<Name> enclosingCandidates(Name name) {
duke@1:         List<Name> names = List.nil();
duke@1:         int index;
duke@1:         while ((index = name.lastIndexOf((byte)'$')) > 0) {
duke@1:             name = name.subName(0, index);
duke@1:             names = names.prepend(name);
duke@1:         }
duke@1:         return names;
duke@1:     }
duke@1: }