1 files changed, 67 insertions, 0 deletions

diff --git a/src/cuchaz/enigma/mapping/NameValidator.java b/src/cuchaz/enigma/mapping/NameValidator.java
new file mode 100644
index 0000000..30982dc
--- /dev/null
+++ b/src/cuchaz/enigma/mapping/NameValidator.java
@@ -0,0 +1,67 @@
+/*******************************************************************************
+ * Copyright (c) 2014 Jeff Martin.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Public License v3.0
+ * which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/gpl.html
+ * 
+ * Contributors:
+ *     Jeff Martin - initial API and implementation
+ ******************************************************************************/
+package cuchaz.enigma.mapping;
+
+import java.util.regex.Pattern;
+
+public class NameValidator
+{
+        private static final String IdentifierPattern;
+        private static final Pattern ClassPattern;
+        
+        static
+        {
+                // java allows all kinds of weird characters...
+                StringBuilder startChars = new StringBuilder();
+                StringBuilder partChars = new StringBuilder();
+                for( int i = Character.MIN_CODE_POINT; i <= Character.MAX_CODE_POINT; i++ )
+                {
+                        if( Character.isJavaIdentifierStart( i ) )
+                        {
+                                startChars.appendCodePoint( i );
+                        }
+                        if( Character.isJavaIdentifierPart( i ) )
+                        {
+                                partChars.appendCodePoint( i );
+                        }
+                }
+                
+                IdentifierPattern = String.format( "[\\Q%s\\E][\\Q%s\\E]*", startChars.toString(), partChars.toString() );
+                ClassPattern = Pattern.compile( String.format( "^(%s(\\.|/))*(%s)$", IdentifierPattern, IdentifierPattern ) );
+        }
+        
+        public String validateClassName( String name )
+        {
+                if( !ClassPattern.matcher( name ).matches() )
+                {
+                        throw new IllegalArgumentException( "Illegal name: " + name );
+                }
+                
+                return classNameToJavaName( name );
+        }
+        
+        public static String fileNameToClassName( String fileName )
+        {
+                final String suffix = ".class";
+                
+                if( !fileName.endsWith( suffix ) )
+                {
+                        return null;
+                }
+                
+                return fileName.substring( 0, fileName.length() - suffix.length() ).replace( "/", "." );
+        }
+        
+        public static String classNameToJavaName( String className )
+        {
+                return className.replace( ".", "/" );
+        }
+}