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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package dasm;
     18 
     19 /**
     20  * Different string manipulations utility methods
     21  */
     22 public class Utils {
     23 
     24     /**
     25      * Replace '.' characters with '/' in a string
     26      */
     27     public static String convertDotsToSlashes(String name) {
     28         if (name == null) return null;
     29 
     30         return name.replace('.', '/');
     31     }
     32 
     33     /**
     34      * Splits string like "v1, v2, v3" or "v1..v3" into list of registers
     35      */
     36     public static String[] splitRegList(String list) {
     37         String[] result = null;
     38         if (list.length() > 0)
     39             result = list.split("[\\s]*,[\\s]*|[\\s]*\\.\\.[\\s]*");
     40         return result;
     41     }
     42 
     43     /**
     44      * Converts string to a smallest possible number (int, long, float or
     45      * double)
     46      */
     47     public static Number stringToNumber(String str)
     48             throws NumberFormatException {
     49         if (str.startsWith("+")) {
     50             return new Integer(str.substring(1));
     51         }
     52         if (str.startsWith("0x")) {
     53             return (Utils.stringToSmallestInteger(str.substring(2), 16));
     54         } else if (str.indexOf('.') != -1) {
     55 
     56             double x = Double.parseDouble(str);
     57             if (x <= (double) Float.MAX_VALUE && x >= (float) Float.MIN_VALUE) {
     58                 return new Float((float) x);
     59             }
     60 
     61             return new Double(x);
     62         } else {
     63             return (Utils.stringToSmallestInteger(str, 10));
     64         }
     65     }
     66 
     67     /**
     68      * Converts string to a smallest possible integer (int or long)
     69      */
     70     private static Number stringToSmallestInteger(String str, int radix)
     71             throws NumberFormatException {
     72         long x = Long.parseLong(str, radix);
     73         if (x <= (long) Integer.MAX_VALUE && x >= (long) Integer.MIN_VALUE) {
     74             return new Integer((int) x);
     75         }
     76         return new Long(x);
     77     }
     78 
     79     /**
     80      * Splits string "package/class/method(param)return_type" into
     81      * "package/class", "method", "(param)return_type"
     82      */
     83     public static String[] getClassMethodSignatureFromString(String name) {
     84 
     85         String signature = convertDotsToSlashes(name);
     86 
     87         String result[] = new String[3];
     88         int mpos = 0, sigpos = 0;
     89         int i;
     90 
     91         // find first '('
     92         sigpos = signature.indexOf('(');
     93         if (sigpos == -1) {
     94             sigpos = 0;
     95             i = signature.length() - 1;
     96         } else {
     97             i = sigpos - 1;
     98         }
     99 
    100         // find last '/' before '('
    101         for (; i >= 0; i--) {
    102             if (signature.charAt(i) == '/') {
    103                 mpos = i;
    104                 break;
    105             }
    106         }
    107         try {
    108             result[0] = signature.substring(0, mpos);
    109             result[1] = signature.substring(mpos + 1, sigpos);
    110             result[2] = signature.substring(sigpos);
    111         } catch (StringIndexOutOfBoundsException e) {
    112             throw new IllegalArgumentException("malformed method signature : "
    113                     + name);
    114         }
    115         return result;
    116     }
    117 
    118     /**
    119      * Splits string "package/class/field" into "package/class" and "field"
    120      */
    121     public static String[] getClassFieldFromString(String name) {
    122         name = convertDotsToSlashes(name);
    123 
    124         String result[] = new String[2];
    125         int pos = name.lastIndexOf('/');
    126 
    127         if (pos == -1) {
    128             result[0] = null;
    129             result[1] = name;
    130         } else {
    131             result[0] = name.substring(0, pos);
    132             result[1] = name.substring(pos + 1);
    133         }
    134 
    135         return result;
    136     }
    137 
    138     /**
    139      * Splits string "method(param)return_type" into "method" and
    140      * "(param)return_type"
    141      */
    142     public static String[] getMethodSignatureFromString(String name) {
    143         int sigpos = name.indexOf('(');
    144         if (sigpos == -1) sigpos = 0;
    145 
    146         String result[] = new String[2];
    147         result[0] = name.substring(0, sigpos);
    148         result[1] = convertDotsToSlashes(name.substring(sigpos));
    149 
    150         return result;
    151     }
    152 
    153 }
    154