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      1 /*
      2  * Copyright 2015, Google Inc.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  *     * Redistributions of source code must retain the above copyright
     10  * notice, this list of conditions and the following disclaimer.
     11  *     * Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *     * Neither the name of Google Inc. nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 package org.jf.smalidea.util;
     33 
     34 import org.antlr.runtime.CommonToken;
     35 import org.jetbrains.annotations.Nullable;
     36 import org.jf.smali.smaliFlexLexer;
     37 import org.jf.smali.smaliParser;
     38 
     39 import java.io.StringReader;
     40 
     41 public class StringUtils {
     42 
     43     @Nullable
     44     public static String parseQuotedString(String str) {
     45         if (str.charAt(0) != '"') {
     46             return null;
     47         }
     48 
     49         smaliFlexLexer lexer = new smaliFlexLexer(new StringReader(str));
     50         lexer.setSuppressErrors(true);
     51 
     52         CommonToken token = (CommonToken)lexer.nextToken();
     53         if (token.getType() != smaliParser.STRING_LITERAL) {
     54             return null;
     55         }
     56 
     57         if (token.getStopIndex() != str.length()-1) {
     58             return null;
     59         }
     60 
     61         String text = token.getText();
     62         return text.substring(1, text.length()-1);
     63     }
     64 }
     65