Altered SYMBOL-FUNCTION behavior and cleaned up some code

src/function/builtin/SYMBOL_FUNCTION.java

@@ -24,16 +24,21 @@ public class SYMBOL_FUNCTION extends LispFunction {
         SExpression symbol = argumentList.getFirst();
         LispFunction function = FunctionTable.lookupFunction(symbol.toString());
 
-        if (function != null) {
-            if (function instanceof UserDefinedFunction)
-                return ((UserDefinedFunction) function).getLambdaExpression();
-
-            return new Symbol(MessageFormat.format("#<SYSTEM-FUNCTION {0}>", symbol.toString()));
-        }
+        if (function != null)
+            return createSymbolRepresentation(symbol, function);
 
         throw new UndefinedSymbolFunctionException(symbol);
     }
 
+    private SExpression createSymbolRepresentation(SExpression symbol, LispFunction function) {
+        if (function instanceof UserDefinedFunction)
+            return ((UserDefinedFunction) function).getLambdaExpression();
+        else if (function instanceof LispSpecialFunction)
+            return new Symbol(MessageFormat.format("#<SPECIAL-FUNCTION {0}>", symbol.toString()));
+
+        return new Symbol(MessageFormat.format("#<FUNCTION {0}>", symbol.toString()));
+    }
+
     public static class UndefinedSymbolFunctionException extends LispException {
 
         private static final long serialVersionUID = 1L;

src/scanner/LispScanner.java

@@ -37,7 +37,7 @@ public class LispScanner {
                 positionTracker.incrementLine();
         }
 
-        return tokenFactory.createEOFToken(positionTracker.getCurrentPosition());
+        return tokenFactory.createEofToken(positionTracker.getCurrentPosition());
     }
 
     private Token createTokenFromCharacter(char c) {
@@ -130,7 +130,7 @@ public class LispScanner {
                 previousCharacter = currentCharacter;
             }
 
-            return terminateTokenWithEOF();
+            return terminateTokenWithEof();
         }
 
         private void addCharacterToToken() {
@@ -153,7 +153,7 @@ public class LispScanner {
             return (currentCharacter == DOUBLE_QUOTE) && (previousCharacter != BACKSLASH);
         }
 
-        private String terminateTokenWithEOF() {
+        private String terminateTokenWithEof() {
             if (isStringToken())
                 throw new UnterminatedStringException(position);
 

src/token/TokenFactory.java

@@ -9,7 +9,7 @@ public interface TokenFactory {
 
     Token createToken(String text, FilePosition position);
 
-    Token createEOFToken(FilePosition position);
+    Token createEofToken(FilePosition position);
 
     public static class EmptyTokenTextException extends CriticalLineColumnException {
 

src/token/TokenFactoryImpl.java

@@ -45,7 +45,7 @@ public class TokenFactoryImpl implements TokenFactory {
         return (text.length() > 1) && isDigit(text.charAt(1));
     }
 
-    public Token createEOFToken(FilePosition position) {
+    public Token createEofToken(FilePosition position) {
         return new Eof("EOF", position);
     }
 

src/util/Characters.java

@@ -46,7 +46,7 @@ public final class Characters {
     public static boolean isLegalStringCharacter(char c) {
         return true;
     }
-    
+
     public static boolean isNumberPrefix(char c) {
         return c == DASH || c == PLUS;
     }

test/function/builtin/SYMBOL_FUNCTIONTester.java

@@ -23,10 +23,17 @@ public class SYMBOL_FUNCTIONTester {
     }
 
     @Test
-    public void testSymbolFunction_BuiltinFunction() {
+    public void testSymbolFunction_BuiltInFunction() {
         String input = "(symbol-function '+)";
 
-        assertEquals("#<SYSTEM-FUNCTION +>", evaluateString(input).toString());
+        assertEquals("#<FUNCTION +>", evaluateString(input).toString());
+    }
+
+    @Test
+    public void testSymbolFunction_BuiltInSpecialFunction() {
+        String input = "(symbol-function 'if)";
+
+        assertEquals("#<SPECIAL-FUNCTION IF>", evaluateString(input).toString());
     }
 
     @Test

test/scanner/LispScannerLineColumnTester.java

@@ -41,7 +41,7 @@ public class LispScannerLineColumnTester {
     }
 
     @Test
-    public void givenNothing_RecordsCorrectEOFLocation() {
+    public void givenNothing_RecordsCorrectEofLocation() {
         String input = "";
         LineColumn[] expectedLinesAndColumns = { LineColumn.create(1, 0) };
 

test/scanner/LispScannerTextTester.java

@@ -63,7 +63,7 @@ public class LispScannerTextTester {
     }
 
     @Test
-    public void givenEOF_ReordsCorrectText() {
+    public void givenEof_ReordsCorrectText() {
         String input = "";
         String expected = "EOF";
 

test/token/TokenFactoryTester.java

@@ -26,8 +26,8 @@ public class TokenFactoryTester {
     }
 
     @Test
-    public void testEOFTokenCreation() {
-        assertTrue(tokenFactory.createEOFToken(testPosition) instanceof Eof);
+    public void testEofTokenCreation() {
+        assertTrue(tokenFactory.createEofToken(testPosition) instanceof Eof);
     }
 
     @Test