/*
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* ProGuard -- shrinking, optimization, obfuscation, and preverification
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* of Java bytecode.
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*
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* Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu)
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package proguard.util;
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import java.io.File;
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/**
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* This StringParser can create StringMatcher instances for regular expressions
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* matching file names. The regular expressions can contain the following
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* wildcards:
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* '?' for a single regular file name character,
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* '*' for any number of regular file name characters, and
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* '**' for any number of regular file name characters or directory separator
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* characters (always including '/').
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*
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* @author Eric Lafortune
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*/
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public class FileNameParser implements StringParser
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{
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// Implementations for StringParser.
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public StringMatcher parse(String regularExpression)
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{
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int index;
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StringMatcher nextMatcher = new EmptyStringMatcher();
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// Look for wildcards.
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for (index = 0; index < regularExpression.length(); index++)
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{
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// Is there a '**' wildcard?
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if (regularExpression.regionMatches(index, "**", 0, 2))
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{
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// Create a matcher for the wildcard and, recursively, for the
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// remainder of the string.
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nextMatcher =
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new VariableStringMatcher(null,
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null,
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0,
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Integer.MAX_VALUE,
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parse(regularExpression.substring(index + 2)));
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break;
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}
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// Is there a '*' wildcard?
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else if (regularExpression.charAt(index) == '*')
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{
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// Create a matcher for the wildcard and, recursively, for the
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// remainder of the string.
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nextMatcher =
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new VariableStringMatcher(null,
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new char[] { File.pathSeparatorChar, '/' },
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0,
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Integer.MAX_VALUE,
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parse(regularExpression.substring(index + 1)));
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break;
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}
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// Is there a '?' wildcard?
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else if (regularExpression.charAt(index) == '?')
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{
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// Create a matcher for the wildcard and, recursively, for the
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// remainder of the string.
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nextMatcher =
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new VariableStringMatcher(null,
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new char[] { File.pathSeparatorChar, '/' },
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1,
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1,
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parse(regularExpression.substring(index + 1)));
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break;
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}
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}
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// Return a matcher for the fixed first part of the regular expression,
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// if any, and the remainder.
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return index != 0 ?
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(StringMatcher)new FixedStringMatcher(regularExpression.substring(0, index), nextMatcher) :
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(StringMatcher)nextMatcher;
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}
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/**
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* A main method for testing file name matching.
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*/
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public static void main(String[] args)
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{
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try
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{
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System.out.println("Regular expression ["+args[0]+"]");
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FileNameParser parser = new FileNameParser();
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StringMatcher matcher = parser.parse(args[0]);
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for (int index = 1; index < args.length; index++)
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{
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String string = args[index];
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System.out.print("String ["+string+"]");
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System.out.println(" -> match = "+matcher.matches(args[index]));
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}
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}
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catch (Exception ex)
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{
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ex.printStackTrace();
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}
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}
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}
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