1 files changed, 126 insertions, 0 deletions
diff --git a/src/proguard/util/VariableStringMatcher.java b/src/proguard/util/VariableStringMatcher.java
new file mode 100644
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+++ b/src/proguard/util/VariableStringMatcher.java
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+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ *             of Java bytecode.
+ *
+ * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu)
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+package proguard.util;
+
+/**
+ * This StringMatcher tests whether strings start with a specified variable
+ * string and then match another given StringMatcher.
+ *
+ * @author Eric Lafortune
+ */
+public class VariableStringMatcher implements StringMatcher
+{
+    private final char[]        allowedCharacters;
+    private final char[]        disallowedCharacters;
+    private final int           minimumLength;
+    private final int           maximumLength;
+    private final StringMatcher nextMatcher;
+
+
+    public VariableStringMatcher(char[]        allowedCharacters,
+                                 char[]        disallowedCharacters,
+                                 int           minimumLength,
+                                 int           maximumLength,
+                                 StringMatcher nextMatcher)
+    {
+        this.allowedCharacters    = allowedCharacters;
+        this.disallowedCharacters = disallowedCharacters;
+        this.minimumLength        = minimumLength;
+        this.maximumLength        = maximumLength;
+        this.nextMatcher          = nextMatcher;
+    }
+
+    // Implementations for StringMatcher.
+
+    public boolean matches(String string)
+    {
+        if (string.length() < minimumLength)
+        {
+            return false;
+        }
+
+        // Check the first minimum number of characters.
+        for (int index = 0; index < minimumLength; index++)
+        {
+            if (!isAllowedCharacter(string.charAt(index)))
+            {
+                return false;
+            }
+        }
+
+        int maximumLength = Math.min(this.maximumLength, string.length());
+
+        // Check the remaining characters, up to the maximum number.
+        for (int index = minimumLength; index < maximumLength; index++)
+        {
+            if (nextMatcher.matches(string.substring(index)))
+            {
+                return true;
+            }
+
+            if (!isAllowedCharacter(string.charAt(index)))
+            {
+                return false;
+            }
+        }
+
+        // Check the remaining characters in the string.
+        return nextMatcher.matches(string.substring(maximumLength));
+    }
+
+
+    // Small utility methods.
+
+    /**
+     * Returns whether the given character is allowed in the variable string.
+     */
+    private boolean isAllowedCharacter(char character)
+    {
+        // Check the allowed characters.
+        if (allowedCharacters != null)
+        {
+            for (int index = 0; index < allowedCharacters.length; index++)
+            {
+                if (allowedCharacters[index] == character)
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        // Check the disallowed characters.
+        if (disallowedCharacters != null)
+        {
+            for (int index = 0; index < disallowedCharacters.length; index++)
+            {
+                if (disallowedCharacters[index] == character)
+                {
+                    return false;
+                }
+            }
+        }
+
+        // Any remaining character is allowed.
+        return true;
+    }
+}