diff --git a/src/com/webcodepro/applecommander/compiler/ApplesoftCompiler.java b/src/com/webcodepro/applecommander/compiler/ApplesoftCompiler.java
index 62c41a2..e26f786 100644
--- a/src/com/webcodepro/applecommander/compiler/ApplesoftCompiler.java
+++ b/src/com/webcodepro/applecommander/compiler/ApplesoftCompiler.java
@@ -24,13 +24,16 @@ import com.webcodepro.applecommander.util.ApplesoftToken;
 import com.webcodepro.applecommander.util.ApplesoftTokenizer;
 import com.webcodepro.applecommander.util.ApplesoftTokens;
 
-import java.io.ByteArrayOutputStream;
-import java.io.PrintWriter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
 import java.util.ArrayList;
+import java.util.Enumeration;
 import java.util.HashMap;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.Properties;
 
 /**
  * Compile the given file as an Applesoft file.
@@ -40,13 +43,30 @@ import java.util.Map;
  */
 public class ApplesoftCompiler implements ApplesoftTokens {
 	private ApplesoftTokenizer tokenizer;
-
-	private List stringVariables = new ArrayList();
-	private List integerVariables = new ArrayList();
-	private List floatVariables = new ArrayList();
-	private Map stringConstants = new HashMap();
-	private Map integerConstants = new HashMap();
-	private Map floatConstants = new HashMap();
+	private ApplesoftToken tokenAlreadySeen;
+	private StringBuffer sourceAssembly = new StringBuffer();
+	private StringBuffer sourceLine = new StringBuffer();
+	
+	/**
+	 * Contains a list of all known Apple ROM addresses that may be used
+	 * by the compiled program.  This map is keyed by the name of the
+	 * address and the value is the address.
+	 */
+	private Map knownAddresses = new HashMap();
+	/**
+	 * Lists the names of all addresses used by the compiled program.
+	 * To identify the value, use the knownAddresses map.
+	 */
+	private List usedAddresses = new ArrayList();
+	/**
+	 * Contains a list of all variables declared or used by the
+	 * program.
+	 */
+	private List variables = new ArrayList();
+	/**
+	 * Dynamically created map of commands to Methods.
+	 */
+	private Map commandMethods = new HashMap();
 
 	/**
 	 * Constructor for ApplesoftCompiler.
@@ -54,296 +74,406 @@ public class ApplesoftCompiler implements ApplesoftTokens {
 	public ApplesoftCompiler(FileEntry fileEntry) {
 		super();
 		tokenizer = new ApplesoftTokenizer(fileEntry);
+		initializeKnownAddresses();
+	}
+	
+	/**
+	 * Load known memory addresses from AppleMemoryAddresses.properties.
+	 */
+	protected void initializeKnownAddresses() {
+		InputStream inputStream = 
+			getClass().getResourceAsStream("AppleMemoryAddresses.properties");
+		Properties properties = new Properties();
+		try {
+			properties.load(inputStream);
+			Enumeration keys = properties.keys();
+			while (keys.hasMoreElements()) {
+				String key = (String) keys.nextElement();
+				knownAddresses.put(key, properties.getProperty(key));
+			}
+		} catch (IOException ex) {
+			ex.printStackTrace();
+		}
+	}
+	
+	/**
+	 * Answers true if there are more tokens to process.
+	 */
+	protected boolean hasMoreTokens() {
+		return peekToken() != null;
+	}
+	
+	/**
+	 * Get the next token.
+	 */
+	protected ApplesoftToken nextToken() {
+		ApplesoftToken token = tokenAlreadySeen;
+		if (tokenAlreadySeen != null) {
+			tokenAlreadySeen = null;
+		} else {
+			token = tokenizer.getNextToken();
+		}
+		if (token == null) {
+			// No more tokens
+		} else if (token.isLineNumber()) {
+			sourceLine.append("* ");
+			sourceLine.append(token.getLineNumber());
+			sourceLine.append(" ");
+		} else if (token.isToken()) {
+			sourceLine.append(token.getTokenString());
+		} else if (token.isString()) {
+			sourceLine.append(token.getStringValue());
+		}
+		return token;
+	}
+	
+	/**
+	 * Take a peek at the next token.
+	 */
+	protected ApplesoftToken peekToken() {
+		if (tokenAlreadySeen == null) {
+			tokenAlreadySeen = tokenizer.getNextToken();
+		}
+		return tokenAlreadySeen;
 	}
 
 	/**
 	 * Compile the given FileEntry and return the assembly code.
 	 */
-	public byte[] compile() {
-		ByteArrayOutputStream assemblyStream = new ByteArrayOutputStream();
-		PrintWriter assemblyWriter = new PrintWriter(assemblyStream);
-		StringBuffer sourceLine = new StringBuffer();
-		StringBuffer sourceAssembly = new StringBuffer();
-		while (tokenizer.hasMoreTokens()) {
-			ApplesoftToken token = tokenizer.getNextToken();
-			if (token == null) {
-				break;
-			} else if (token.isLineNumber()) {
-				if (sourceLine.length() > 0) {
-					assemblyWriter.println(sourceLine.toString());
-					assemblyWriter.println(sourceAssembly.toString());
-					sourceLine.setLength(0);
-					sourceAssembly.setLength(0);
-				}
-				sourceAssembly.append("LINE");
-				sourceAssembly.append(token.getLineNumber());
-				sourceAssembly.append(":\n");
-				sourceLine.append("* ");
-				sourceLine.append(token.getLineNumber());
-				sourceLine.append(" ");
-			} else if (token.isToken()) {
-				sourceLine.append(token.getTokenString());
-				processToken(sourceAssembly, sourceLine, token, tokenizer);
-			} else if (token.isString()) {
-				sourceLine.append(token.getStringValue());
-				// FIXME - process string/expressions!
-			}
-		}
-		if (sourceLine.length() > 0) {
-			assemblyWriter.println(sourceLine.toString());
-			assemblyWriter.println(sourceAssembly.toString());
+	public byte[] compile() throws CompileException {
+		StringBuffer programCode = new StringBuffer();
+		while (hasMoreTokens()) {
 			sourceLine.setLength(0);
 			sourceAssembly.setLength(0);
-		}
-		
-		if (!stringConstants.isEmpty()) {
-			assemblyWriter.println("\n* String constant values:");
-			Iterator iterator = stringConstants.keySet().iterator();
-			while (iterator.hasNext()) {
-				String name = (String) iterator.next();
-				assemblyWriter.print(name);
-				assemblyWriter.print(":\tASC ");
-				assemblyWriter.println(stringConstants.get(name));
-				assemblyWriter.println("\tHEX 00");
+			ApplesoftToken token = nextToken();
+			if (!token.isLineNumber()) {
+				throw new CompileException("Expecting a line number.");
 			}
+			sourceAssembly.append("LINE");
+			sourceAssembly.append(token.getLineNumber());
+			sourceAssembly.append(":\n");
+			do {
+				evaluateCommand();
+				token = peekToken();
+				if (token != null && token.isCommandSeparator()) {
+					token = nextToken();
+				}
+			} while (token != null &&  token.isCommandSeparator());
+			programCode.append(sourceLine);
+			programCode.append("\n");
+			programCode.append(sourceAssembly);
+			programCode.append("\n");
 		}
-		if (!integerConstants.isEmpty()) {
-			assemblyWriter.println("\n* Integer constant values:");
-			Iterator iterator = integerConstants.keySet().iterator();
-			while (iterator.hasNext()) {
-				String name = (String) iterator.next();
-				assemblyWriter.print(name);
-				assemblyWriter.print(":\tDW ");
-				assemblyWriter.println(integerConstants.get(name));
-			}
-		}
-		
-		if (!integerVariables.isEmpty()) {
-			assemblyWriter.println("\n* Integer variables:");
-			for (int i = 0; i<integerVariables.size(); i++) {
-				assemblyWriter.print(integerVariables.get(i));
-				assemblyWriter.println(": DW 0");
-			}
-		}
-		if (!floatVariables.isEmpty()) {
-			assemblyWriter.println("\n* Float variables:");
-			for (int i = 0; i<floatVariables.size(); i++) {
-				assemblyWriter.print(floatVariables.get(i));
-				assemblyWriter.println(": DS 5");
-			}
-		}
-		
-		assemblyWriter.close();
-		return assemblyStream.toByteArray();
+		programCode.insert(0, buildUsedAddresses());
+		return programCode.toString().getBytes();
 	}
 	
-	/**
-	 * Process and individual token.
-	 */
-	protected void processToken(StringBuffer sourceAssembly, 
-	StringBuffer sourceLine, ApplesoftToken token, ApplesoftTokenizer tokenizer) {
-		String expr = null;
-		switch (token.getTokenValue()) {
-			case HOME:	sourceAssembly.append("\tJSR $FC58\n");
-						break;
-			case STOP:
-			case RETURN:
-			case END:	sourceAssembly.append("\tRTS\n");
-						break;
-			case TEXT:	sourceAssembly.append("\tJSR $FB2F\n");
-						break;
-			case HGR:	sourceAssembly.append("\tJSR $F3E2\n");
-						break;
-			case HGR2:	sourceAssembly.append("\tJSR $F3D8\n");
-						break;
-			case GR:	sourceAssembly.append("\tJSR $FB40\n");
-						break;
-			case INVERSE:
-						sourceAssembly.append("\tLDA #$3F\n");
-						sourceAssembly.append("\tSTA $32\n");
-						break;
-			case NORMAL:
-						sourceAssembly.append("\tLDA #$FF\n");
-						sourceAssembly.append("\tSTA $32\n");
-						break;
-			case FLASH:
-						sourceAssembly.append("\tLDA #$7F\n");
-						sourceAssembly.append("\tSTA $32\n");
-						break;
-			case VTAB:	expr = evaluateExpression(sourceAssembly, sourceLine);
-						sourceAssembly.append("\tLDA ");
-						sourceAssembly.append(expr);
-						sourceAssembly.append("\n");
-						sourceAssembly.append("\tSTA $25\n");
-						sourceAssembly.append("\tJSR $FC66\n");
-						break;
-			case HTAB:	expr = evaluateExpression(sourceAssembly, sourceLine);
-						sourceAssembly.append("\tLDA ");
-						sourceAssembly.append(expr);
-						sourceAssembly.append("\n");
-						sourceAssembly.append("\tSTA $24\n");
-						break;
-			case HCOLOR:
-						expr = evaluateExpression(sourceAssembly, sourceLine);
-						sourceAssembly.append("\tLDX ");
-						sourceAssembly.append(expr);
-						sourceAssembly.append("\n");
-						sourceAssembly.append("\tJSR $F6F0\n");
-						break;
-			case PRINT:
-						expr = evaluateExpression(sourceAssembly, sourceLine);
-						if (isIntegerVariable(expr)) {
-							throw new IllegalArgumentException("Integer not supported in print: " + expr);
-						} else if (isFloatVariable(expr)) {
-							sourceAssembly.append("\tLDY #>");
-							sourceAssembly.append(expr);
-							sourceAssembly.append("\n");
-							sourceAssembly.append("\tLDA #<");
-							sourceAssembly.append(expr);
-							sourceAssembly.append("\n");
-							sourceAssembly.append("\tJSR $EAF9\t; MOVFM\n");
-							sourceAssembly.append("\tJSR $ED2E\t; PRNTFAC\n");
-						} else if (isStringVariable(expr)) {
-							sourceAssembly.append("\tLDY #0\n");
-							sourceAssembly.append(":loop\tLDA ");
-							sourceAssembly.append(expr);
-							sourceAssembly.append(",Y\n");
-							sourceAssembly.append("\tBEQ :end\n");
-							sourceAssembly.append("\tJSR COUT\n");
-							sourceAssembly.append("\tINY\n");
-							sourceAssembly.append("\tBNE :loop\n");
-							sourceAssembly.append(":end\n");
-						} else {
-							throw new IllegalArgumentException("Invalid expr in print: " + expr);
-						}
-						break;
-			case FOR:
-						String loopVariable = evaluateExpression(sourceAssembly, sourceLine);
-						if (!isFloatVariable(loopVariable)) {
-							throw new IllegalArgumentException("FOR loop argument must be a float");
-						}
-						token = tokenizer.getNextToken();
-						if (token.getTokenValue() != EQUALS) {
-							throw new IllegalArgumentException("FOR requires =");
-						}
-						sourceLine.append(token.getTokenString());
-						String startValue = evaluateExpression(sourceAssembly, sourceLine);
-						token = tokenizer.getNextToken();
-						if (token.getTokenValue() != TO) {
-							throw new IllegalArgumentException("FOR requires TO");
-						}
-						sourceLine.append(token.getTokenString());
-						String endValue = evaluateExpression(sourceAssembly, sourceLine);
-						if (isFloatVariable(loopVariable)) {
-							// FIXME: Assumes start/end are integer
-							sourceAssembly.append("\tLDY ");
-							sourceAssembly.append(startValue);
-							sourceAssembly.append("\n");
-							sourceAssembly.append("\tLDA ");
-							sourceAssembly.append(startValue);
-							sourceAssembly.append("\n");
-							sourceAssembly.append("\tJSR $E2F2 ; GIVAYF\n");
-							sourceAssembly.append("\tLDY #>");
-							sourceAssembly.append(loopVariable);
-							sourceAssembly.append("\n");
-							sourceAssembly.append("\tLDX #<");
-							sourceAssembly.append(loopVariable);
-							sourceAssembly.append("\n");
-							sourceAssembly.append("\tJSR $EB2B ; MOVMF\n");
-						}
-						break;
+	protected StringBuffer buildUsedAddresses() {
+		StringBuffer buf = new StringBuffer();
+		if (usedAddresses.size() > 0) {
+			buf.append("* Addresses:\n");
+			for (int i=0; i<usedAddresses.size(); i++) {
+				String label = (String) usedAddresses.get(i);
+				buf.append(label);
+				buf.append(" = ");
+				buf.append((String) knownAddresses.get(label));
+				buf.append("\n");
+			}
+			buf.append("\n");
 		}
+		return buf;
 	}
 	
-	/**
-	 * Evaluate an expression and return the variable name that
-	 * contains the value.
-	 */
-	protected String evaluateExpression(StringBuffer sourceAssembly, StringBuffer sourceLine) {
-		// FIXME: no type checking available
-		ApplesoftToken token = tokenizer.getNextToken();
-		if (token.isString()) {
-			String value = token.getStringValue();
-			sourceLine.append(value);
-			if (isIntegerNumber(value)) {
-				return addIntegerConstant(value);
-			} else if (value.startsWith("\"")) {
-				return addStringConstant(value);
-			} else {	// assume variable name
-				return addVariable(value);
+	protected void evaluateCommand() {
+		ApplesoftToken token = nextToken();
+		while (token != null && token.isCommandSeparator()) {
+			token = nextToken();
+		}
+		if (token == null || !token.isToken()) {
+			return;	// end of line (no command on line...)
+		}
+		Method method = getMethod(token);
+		if (method != null) {
+			try {
+				method.invoke(this, new Object[0]);
+			} catch (IllegalArgumentException e) {
+				e.printStackTrace();
+			} catch (IllegalAccessException e) {
+				e.printStackTrace();
+			} catch (InvocationTargetException e) {
+				e.printStackTrace();
 			}
 		} else {
-			throw new IllegalArgumentException("Oops!");
-		}
-	}
-	
-	/**
-	 * Indicates if this string is a number.
-	 */
-	protected boolean isIntegerNumber(String value) {
-		for (int i=0; i<value.length(); i++) {
-			if (!Character.isDigit(value.charAt(i))) {
-				return false;
+			// FIXME: Just during development - this should throw an exception!
+			while (peekToken() != null && !peekToken().isCommandSeparator() && !peekToken().isLineNumber()) {
+				nextToken();
 			}
 		}
-		return true;
 	}
 	
-	protected String addIntegerConstant(String value) {
-		String name = "INT" + value;
-		if (!integerConstants.containsKey(name)) {
-			integerConstants.put(name, value);
+	protected Method getMethod(ApplesoftToken token) {
+		String tokenName = "evaluate" + token.getTokenString().trim();
+		Method method = (Method) commandMethods.get(tokenName);
+		if (method == null) {
+			try {
+				method = getClass().getMethod(tokenName, new Class[0]);
+				commandMethods.put(tokenName, method);
+			} catch (SecurityException e) {
+				e.printStackTrace();
+				return null;
+			} catch (NoSuchMethodException e) {
+				// This is actually valid (during development anyway)
+				//e.printStackTrace();
+				return null;
+			}
 		}
-		return name;
+		return method;
 	}
-
-	protected String addStringConstant(String value) {
-		String name = "STR" + stringConstants.size();
-		if (stringConstants.containsValue(value)) {
-			Iterator iterator = stringConstants.keySet().iterator();
-			while (iterator.hasNext()) {
-				String key = (String) iterator.next();
-				String keyValue = (String) stringConstants.get(key);
-				if (value.equals(keyValue)) {
-					name = key;
-					break;
+	
+	protected void addAssembly(String label, String mnemonic, String parameter) {
+		if (label != null) {
+			sourceAssembly.append(label);
+			sourceAssembly.append(":\n");
+		}
+		if (mnemonic != null) {
+			sourceAssembly.append(" ");
+			sourceAssembly.append(mnemonic);
+			if (parameter != null) {
+				sourceAssembly.append(" ");
+				sourceAssembly.append(parameter);
+				if (!usedAddresses.contains(parameter)) {
+					usedAddresses.add(parameter);
 				}
 			}
-		} else {
-			stringConstants.put(name, value);
+			sourceAssembly.append("\n");
 		}
-		return name;
-	}
-	
-	protected String addVariable(String variableName) {
-		if (variableName.endsWith("$")) {
-			variableName = "STR" + variableName;
-			if (!stringVariables.contains(variableName)) {
-				stringVariables.add(variableName);
-			}
-		} else if (variableName.endsWith("%")) {
-			variableName = "INT" + variableName;
-			if (!integerVariables.contains(variableName)) {
-				integerVariables.add(variableName);
-			}
-		} else {
-			variableName = "FP" + variableName;
-			if (!floatVariables.contains(variableName)) {
-				floatVariables.add(variableName);
-			}
-		}
-		return variableName;
-	}
-	
-	protected boolean isIntegerVariable(String name) {
-		return integerVariables.contains(name) || integerConstants.containsKey(name);
 	}
 
-	protected boolean isFloatVariable(String name) {
-		return floatVariables.contains(name) || floatConstants.containsKey(name);
+	public void evaluateHOME() {
+		addAssembly(null, "JSR", "HOME");
 	}
 
-	protected boolean isStringVariable(String name) {
-		return stringVariables.contains(name) || stringConstants.containsKey(name);
+	public void evaluateTEXT() {
+		addAssembly(null, "JSR", "TEXT");
 	}
+	
+	public void evaluateRETURN() {
+		addAssembly(null, "RTS", null);
+	}
+	
+	public void evaluateEND() {
+		evaluateRETURN();
+	}
+	
+	public void evaluateHGR() {
+		addAssembly(null, "JSR", "HGR");
+	}
+	
+	public void evaluateHGR2() {
+		addAssembly(null, "JSR", "HGR2");
+	}
+	
+	public void evaluateGR() {
+		addAssembly(null, "JSR", "GR");
+	}
+	
+	public void evaluateINVERSE() {
+		addAssembly(null, "LDA", "#$3F");
+		addAssembly(null, "STA", "$32");
+	}
+	
+	public void evaluateNORMAL() {
+		addAssembly(null, "LDA", "#$FF");
+		addAssembly(null, "STA", "$32");
+	}
+	
+	public void evaluateFLASH() {
+		addAssembly(null, "LDA", "#$7F");
+		addAssembly(null, "STA", "$32");
+	}
+
+
+//	/**
+//	 * Process and individual token.
+//	 */
+//	protected void processToken(StringBuffer sourceAssembly, 
+//	StringBuffer sourceLine, ApplesoftToken token, ApplesoftTokenizer tokenizer) {
+//		String expr = null;
+//		switch (token.getTokenValue()) {
+//			case VTAB:	expr = evaluateExpression(sourceAssembly, sourceLine);
+//						sourceAssembly.append("\tLDA ");
+//						sourceAssembly.append(expr);
+//						sourceAssembly.append("\n");
+//						sourceAssembly.append("\tSTA $25\n");
+//						sourceAssembly.append("\tJSR $FC66\n");
+//						break;
+//			case HTAB:	expr = evaluateExpression(sourceAssembly, sourceLine);
+//						sourceAssembly.append("\tLDA ");
+//						sourceAssembly.append(expr);
+//						sourceAssembly.append("\n");
+//						sourceAssembly.append("\tSTA $24\n");
+//						break;
+//			case HCOLOR:
+//						expr = evaluateExpression(sourceAssembly, sourceLine);
+//						sourceAssembly.append("\tLDX ");
+//						sourceAssembly.append(expr);
+//						sourceAssembly.append("\n");
+//						sourceAssembly.append("\tJSR $F6F0\n");
+//						break;
+//			case PRINT:
+//						expr = evaluateExpression(sourceAssembly, sourceLine);
+//						if (isIntegerVariable(expr)) {
+//							throw new IllegalArgumentException("Integer not supported in print: " + expr);
+//						} else if (isFloatVariable(expr)) {
+//							sourceAssembly.append("\tLDY #>");
+//							sourceAssembly.append(expr);
+//							sourceAssembly.append("\n");
+//							sourceAssembly.append("\tLDA #<");
+//							sourceAssembly.append(expr);
+//							sourceAssembly.append("\n");
+//							sourceAssembly.append("\tJSR $EAF9\t; MOVFM\n");
+//							sourceAssembly.append("\tJSR $ED2E\t; PRNTFAC\n");
+//						} else if (isStringVariable(expr)) {
+//							sourceAssembly.append("\tLDY #0\n");
+//							sourceAssembly.append(":loop\tLDA ");
+//							sourceAssembly.append(expr);
+//							sourceAssembly.append(",Y\n");
+//							sourceAssembly.append("\tBEQ :end\n");
+//							sourceAssembly.append("\tJSR COUT\n");
+//							sourceAssembly.append("\tINY\n");
+//							sourceAssembly.append("\tBNE :loop\n");
+//							sourceAssembly.append(":end\n");
+//						} else {
+//							throw new IllegalArgumentException("Invalid expr in print: " + expr);
+//						}
+//						break;
+//			case FOR:
+//						String loopVariable = evaluateExpression(sourceAssembly, sourceLine);
+//						if (!isFloatVariable(loopVariable)) {
+//							throw new IllegalArgumentException("FOR loop argument must be a float");
+//						}
+//						token = tokenizer.getNextToken();
+//						if (token.getTokenValue() != EQUALS) {
+//							throw new IllegalArgumentException("FOR requires =");
+//						}
+//						sourceLine.append(token.getTokenString());
+//						String startValue = evaluateExpression(sourceAssembly, sourceLine);
+//						token = tokenizer.getNextToken();
+//						if (token.getTokenValue() != TO) {
+//							throw new IllegalArgumentException("FOR requires TO");
+//						}
+//						sourceLine.append(token.getTokenString());
+//						String endValue = evaluateExpression(sourceAssembly, sourceLine);
+//						if (isFloatVariable(loopVariable)) {
+//							// FIXME: Assumes start/end are integer
+//							sourceAssembly.append("\tLDY ");
+//							sourceAssembly.append(startValue);
+//							sourceAssembly.append("\n");
+//							sourceAssembly.append("\tLDA ");
+//							sourceAssembly.append(startValue);
+//							sourceAssembly.append("\n");
+//							sourceAssembly.append("\tJSR $E2F2 ; GIVAYF\n");
+//							sourceAssembly.append("\tLDY #>");
+//							sourceAssembly.append(loopVariable);
+//							sourceAssembly.append("\n");
+//							sourceAssembly.append("\tLDX #<");
+//							sourceAssembly.append(loopVariable);
+//							sourceAssembly.append("\n");
+//							sourceAssembly.append("\tJSR $EB2B ; MOVMF\n");
+//						}
+//						break;
+//		}
+//	}
+//	
+//	/**
+//	 * Evaluate an expression and return the variable name that
+//	 * contains the value.
+//	 */
+//	protected String evaluateExpression(StringBuffer sourceAssembly, StringBuffer sourceLine) {
+//		// FIXME: no type checking available
+//		ApplesoftToken token = tokenizer.getNextToken();
+//		if (token.isString()) {
+//			String value = token.getStringValue();
+//			sourceLine.append(value);
+//			if (isIntegerNumber(value)) {
+//				return addIntegerConstant(value);
+//			} else if (value.startsWith("\"")) {
+//				return addStringConstant(value);
+//			} else {	// assume variable name
+//				return addVariable(value);
+//			}
+//		} else {
+//			throw new IllegalArgumentException("Oops!");
+//		}
+//	}
+//	
+//	/**
+//	 * Indicates if this string is a number.
+//	 */
+//	protected boolean isIntegerNumber(String value) {
+//		for (int i=0; i<value.length(); i++) {
+//			if (!Character.isDigit(value.charAt(i))) {
+//				return false;
+//			}
+//		}
+//		return true;
+//	}
+//	
+//	protected String addIntegerConstant(String value) {
+//		String name = "INT" + value;
+//		if (!integerConstants.containsKey(name)) {
+//			integerConstants.put(name, value);
+//		}
+//		return name;
+//	}
+//
+//	protected String addStringConstant(String value) {
+//		String name = "STR" + stringConstants.size();
+//		if (stringConstants.containsValue(value)) {
+//			Iterator iterator = stringConstants.keySet().iterator();
+//			while (iterator.hasNext()) {
+//				String key = (String) iterator.next();
+//				String keyValue = (String) stringConstants.get(key);
+//				if (value.equals(keyValue)) {
+//					name = key;
+//					break;
+//				}
+//			}
+//		} else {
+//			stringConstants.put(name, value);
+//		}
+//		return name;
+//	}
+//	
+//	protected String addVariable(String variableName) {
+//		if (variableName.endsWith("$")) {
+//			variableName = "STR" + variableName;
+//			if (!stringVariables.contains(variableName)) {
+//				stringVariables.add(variableName);
+//			}
+//		} else if (variableName.endsWith("%")) {
+//			variableName = "INT" + variableName;
+//			if (!integerVariables.contains(variableName)) {
+//				integerVariables.add(variableName);
+//			}
+//		} else {
+//			variableName = "FP" + variableName;
+//			if (!floatVariables.contains(variableName)) {
+//				floatVariables.add(variableName);
+//			}
+//		}
+//		return variableName;
+//	}
+//	
+//	protected boolean isIntegerVariable(String name) {
+//		return integerVariables.contains(name) || integerConstants.containsKey(name);
+//	}
+//
+//	protected boolean isFloatVariable(String name) {
+//		return floatVariables.contains(name) || floatConstants.containsKey(name);
+//	}
+//
+//	protected boolean isStringVariable(String name) {
+//		return stringVariables.contains(name) || stringConstants.containsKey(name);
+//	}
 }