changes

AndroidManifest.xml

@@ -17,7 +17,7 @@
 
 		<activity a:name=".CalculatorActivity"
 				  a:label="@string/c_app_name">
-
+			                                                                                                                 s
 			<intent-filter>
 				<action a:name="android.intent.action.MAIN"/>
 				<category a:name="android.intent.category.LAUNCHER"/>

res/values/attrs.xml

@@ -3,6 +3,7 @@
 	<declare-styleable name="DragButton">
 		<attr name="textUp" format="string"/>
 		<attr name="textDown" format="string"/>
+		<attr name="textLeft" format="string"/>
 		<attr name="directionTextScale" format="float"/>
 		<attr name="hTextPosition" format="float"/>
 	</declare-styleable>

src/main/java/org/solovyev/android/calculator/CalculatorActivity.java

@@ -139,7 +139,7 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 			boolean result = false;
 
 			if ( dragButton instanceof AngleUnitsButton ) {
-				final String directionText = ((AngleUnitsButton) dragButton).getDirectionText(dragDirection);
+				final String directionText = ((AngleUnitsButton) dragButton).getText(dragDirection);
 				if ( directionText != null ) {
 					try {
 
@@ -508,7 +508,8 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 		if (CalculatorEngine.GROUPING_SEPARATOR_P_KEY.equals(key) ||
 				CalculatorEngine.ROUND_RESULT_P_KEY.equals(key) ||
 					CalculatorEngine.RESULT_PRECISION_P_KEY.equals(key) ||
-						CalculatorEngine.ANGLE_UNITS_P_KEY.equals(key)) {
+						CalculatorEngine.ANGLE_UNITS_P_KEY.equals(key) ||
+							CalculatorEngine.NUMERAL_BASES_P_KEY.equals(key)) {
 			CalculatorEngine.instance.reset(this, preferences);
 			this.calculatorModel.evaluate();
 		}

src/main/java/org/solovyev/android/calculator/CalculatorDisplay.java

@@ -15,7 +15,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.calculator.jscl.JsclOperation;
 import org.solovyev.android.calculator.model.CalculatorEngine;
-import org.solovyev.android.calculator.model.ParseException;
+import org.solovyev.android.calculator.model.CalculatorParseException;
 import org.solovyev.android.calculator.model.TextProcessor;
 import org.solovyev.android.view.AutoResizeTextView;
 
@@ -97,7 +97,7 @@ public class CalculatorDisplay extends AutoResizeTextView {
 			try {
 				TextHighlighter.Result result = textHighlighter.process(text);
 				text = result.toString();
-			} catch (ParseException e) {
+			} catch (CalculatorParseException e) {
 				Log.e(this.getClass().getName(), e.getMessage(), e);
 			}
 

src/main/java/org/solovyev/android/calculator/CalculatorEditor.java

@@ -14,9 +14,8 @@ import android.view.ContextMenu;
 import android.widget.EditText;
 import org.jetbrains.annotations.NotNull;
 import org.solovyev.android.calculator.model.CalculatorEngine;
-import org.solovyev.android.calculator.model.ParseException;
+import org.solovyev.android.calculator.model.CalculatorParseException;
 import org.solovyev.android.calculator.model.TextProcessor;
-import org.solovyev.common.math.calculators.Calculator;
 
 /**
  * User: serso
@@ -81,7 +80,7 @@ public class CalculatorEditor extends EditText {
 				selectionStart += result.getOffset();
 				selectionEnd += result.getOffset();
 				text = result.toString();
-			} catch (ParseException e) {
+			} catch (CalculatorParseException e) {
 				Log.e(this.getClass().getName(), e.getMessage(), e);
 			}
 

src/main/java/org/solovyev/android/calculator/CalculatorModel.java

@@ -25,11 +25,13 @@ import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.calculator.jscl.JsclOperation;
 import org.solovyev.android.calculator.math.MathType;
 import org.solovyev.android.calculator.model.CalculatorEngine;
-import org.solovyev.android.calculator.model.ParseException;
+import org.solovyev.android.calculator.model.CalculatorEvalException;
+import org.solovyev.android.calculator.model.CalculatorParseException;
 import org.solovyev.android.calculator.model.Var;
 import org.solovyev.android.view.CursorControl;
 import org.solovyev.android.view.HistoryControl;
 import org.solovyev.common.BooleanMapper;
+import org.solovyev.common.msg.Message;
 import org.solovyev.common.utils.CollectionsUtils;
 import org.solovyev.common.utils.MutableObject;
 import org.solovyev.common.utils.StringUtils;
@@ -235,7 +237,9 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 				}
 				display.setJsclOperation(result.getUserOperation());
 				display.setGenericResult(result.getGenericResult());
-			} catch (ParseException e) {
+			} catch (CalculatorParseException e) {
+				handleEvaluationException(expression, display, operation, e);
+			} catch (CalculatorEvalException e) {
 				handleEvaluationException(expression, display, operation, e);
 			}
 		} else {
@@ -252,8 +256,8 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 	private void handleEvaluationException(@NotNull String expression,
 										   @NotNull CalculatorDisplay localDisplay,
 										   @NotNull JsclOperation operation,
-										   @NotNull ParseException e) {
+										   @NotNull Message e) {
-		Log.d(CalculatorModel.class.getName(), "Evaluation failed for : " + expression + ". Error message: " + e.getMessage());
+		Log.d(CalculatorModel.class.getName(), "Evaluation failed for : " + expression + ". Error message: " + e);
 		localDisplay.setText(R.string.c_syntax_error);
 		localDisplay.setJsclOperation(operation);
 		localDisplay.setGenericResult(null);

src/main/java/org/solovyev/android/calculator/CalculatorPlotActivity.java

@@ -46,7 +46,7 @@ import java.io.Serializable;
  */
 public class CalculatorPlotActivity extends Activity {
 
-	private static final int DEFAULT_NUMBER_OF_STEPS = 200;
+	private static final int DEFAULT_NUMBER_OF_STEPS = 100;
 
 	private static final int DEFAULT_MIN_NUMBER = -10;
 
@@ -54,7 +54,7 @@ public class CalculatorPlotActivity extends Activity {
 
 	public static final String INPUT = "org.solovyev.android.calculator.CalculatorPlotActivity_input";
 
-	public static final long EVAL_DELAY_MILLIS = 200;
+	public static final long EVAL_DELAY_MILLIS = 400;
 
 	private XYChart chart;
 
@@ -165,7 +165,7 @@ public class CalculatorPlotActivity extends Activity {
 		});
 		graphContainer.addView(graphicalView);
 
-		updateDataSets(chart, 100);
+		updateDataSets(chart, 50);
 	}
 
 
@@ -277,14 +277,6 @@ public class CalculatorPlotActivity extends Activity {
 		private final double yMin;
 		private final double yMax;
 
-
-		public PlotBoundaries(double xMin, double xMax, double yMin, double yMax) {
-			this.xMin = xMin;
-			this.xMax = xMax;
-			this.yMin = yMin;
-			this.yMax = yMax;
-		}
-
 		public PlotBoundaries(@NotNull XYMultipleSeriesRenderer renderer) {
 			this.xMin = renderer.getXAxisMin();
 			this.yMin = renderer.getYAxisMin();
@@ -303,41 +295,6 @@ public class CalculatorPlotActivity extends Activity {
 		}
 	}
 
-	private static final class Point implements Serializable {
-		/**
-		 * The X axis coordinate value.
-		 */
-		private double x;
-		/**
-		 * The Y axis coordinate value.
-		 */
-		private double  y;
-
-		public Point() {
-		}
-
-		public Point(double  x, double  y) {
-			this.x = x;
-			this.y = y;
-		}
-
-		public double  getX() {
-			return x;
-		}
-
-		public double  getY() {
-			return y;
-		}
-
-		public void setX(double  x) {
-			this.x = x;
-		}
-
-		public void setY(double  y) {
-			this.y = y;
-		}
-	}
-
 
 	@NotNull
 	private static XYSeriesRenderer createCommonRenderer() {

src/main/java/org/solovyev/android/calculator/CalculatorPreferencesActivity.java

@@ -33,9 +33,9 @@ public class CalculatorPreferencesActivity extends PreferenceActivity implements
 	@Override
 	public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {
 		if (CalculatorEngine.ROUND_RESULT_P_KEY.equals(key)) {
-			findPreference(CalculatorEngine.RESULT_PRECISION_P_KEY).setEnabled(preferences.getBoolean(key, true));
+			findPreference(CalculatorEngine.RESULT_PRECISION_P_KEY).setEnabled(preferences.getBoolean(key, CalculatorEngine.ROUND_RESULT_DEFAULT));
 		} else if (VibratorContainer.HAPTIC_FEEDBACK_P_KEY.equals(key)) {
-			findPreference(VibratorContainer.HAPTIC_FEEDBACK_DURATION_P_KEY).setEnabled(preferences.getBoolean(key, true));
+			findPreference(VibratorContainer.HAPTIC_FEEDBACK_DURATION_P_KEY).setEnabled(preferences.getBoolean(key, VibratorContainer.HAPTIC_FEEDBACK_DEFAULT));
 		}
 	}
 }

src/main/java/org/solovyev/android/calculator/DigitButtonDragProcessor.java

@@ -30,7 +30,7 @@ public class DigitButtonDragProcessor implements SimpleOnDragListener.DragProces
 	@Override
 	public boolean processDragEvent(@NotNull DragDirection dragDirection, @NotNull DragButton dragButton, @NotNull Point2d startPoint2d, @NotNull MotionEvent motionEvent) {
 		assert dragButton instanceof DirectionDragButton;
-		calculatorModel.processDigitButtonAction(((DirectionDragButton) dragButton).getDirectionText(dragDirection));
+		calculatorModel.processDigitButtonAction(((DirectionDragButton) dragButton).getText(dragDirection));
 		return true;
 	}
 

src/main/java/org/solovyev/android/calculator/TextHighlighter.java

@@ -10,7 +10,7 @@ import jscl.MathContext;
 import org.jetbrains.annotations.NotNull;
 import org.solovyev.android.calculator.math.MathType;
 import org.solovyev.android.calculator.model.NumberBuilder;
-import org.solovyev.android.calculator.model.ParseException;
+import org.solovyev.android.calculator.model.CalculatorParseException;
 import org.solovyev.android.calculator.model.TextProcessor;
 import org.solovyev.common.utils.MutableObject;
 
@@ -81,7 +81,7 @@ public class TextHighlighter implements TextProcessor<TextHighlighter.Result> {
 
 	@NotNull
 	@Override
-	public Result process(@NotNull String text) throws ParseException {
+	public Result process(@NotNull String text) throws CalculatorParseException {
 		final String result;
 
 		int maxNumberOfOpenGroupSymbols = 0;

src/main/java/org/solovyev/android/calculator/jscl/FromJsclNumericTextProcessor.java

@@ -11,7 +11,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.calculator.math.MathType;
 import org.solovyev.android.calculator.model.CalculatorEngine;
-import org.solovyev.android.calculator.model.ParseException;
+import org.solovyev.android.calculator.model.CalculatorParseException;
 import org.solovyev.android.calculator.model.TextProcessor;
 import org.solovyev.common.utils.StringUtils;
 
@@ -24,7 +24,7 @@ class FromJsclNumericTextProcessor implements TextProcessor<String> {
 
 	@NotNull
 	@Override
-	public String process(@NotNull String result) throws ParseException {
+	public String process(@NotNull String result) throws CalculatorParseException {
 		try {
 			final Double doubleValue = Double.valueOf(result);
 
@@ -39,7 +39,7 @@ class FromJsclNumericTextProcessor implements TextProcessor<String> {
 				result = createResultForComplexNumber(result.replace(MathType.IMAGINARY_NUMBER_JSCL, MathType.IMAGINARY_NUMBER));
 			} catch (NumberFormatException e1) {
 				// throw original one
-				throw new ParseException(new jscl.text.ParseException(Messages.msg_8, 0, result, result));
+				throw new CalculatorParseException(new jscl.text.ParseException(Messages.msg_8, 0, result, result));
 			}
 		}
 

src/main/java/org/solovyev/android/calculator/math/MathType.java

@@ -11,7 +11,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.calculator.StartsWithFinder;
 import org.solovyev.android.calculator.model.CalculatorEngine;
-import org.solovyev.android.calculator.model.ParseException;
+import org.solovyev.android.calculator.model.CalculatorParseException;
 import org.solovyev.common.utils.CollectionsUtils;
 import org.solovyev.common.utils.Finder;
 
@@ -48,7 +48,7 @@ public enum MathType {
 
 	grouping_separator(250, false, false, "'", " "){
 		@Override
-		public int processToJscl(@NotNull StringBuilder result, int i, @NotNull String match) throws ParseException {
+		public int processToJscl(@NotNull StringBuilder result, int i, @NotNull String match) throws CalculatorParseException {
 			return i;
 		}
 	},
@@ -262,7 +262,7 @@ public enum MathType {
 		return needMultiplicationSignBefore && mathTypeBefore.isNeedMultiplicationSignAfter();
 	}
 
-	public int processToJscl(@NotNull StringBuilder result, int i, @NotNull String match) throws ParseException {
+	public int processToJscl(@NotNull StringBuilder result, int i, @NotNull String match) throws CalculatorParseException {
 		final String substitute = getSubstituteToJscl(match);
 		result.append(substitute == null ? match : substitute);
 		return returnI(i, match);
@@ -378,7 +378,7 @@ public enum MathType {
 			this.match = match;
 		}
 
-		public int processToJscl(@NotNull StringBuilder result, int i) throws ParseException {
+		public int processToJscl(@NotNull StringBuilder result, int i) throws CalculatorParseException {
 			return mathType.processToJscl(result, i, match);
 		}
 

src/main/java/org/solovyev/android/calculator/model/CalculatorEngine.java

@@ -7,10 +7,7 @@ package org.solovyev.android.calculator.model;
 
 import android.content.Context;
 import android.content.SharedPreferences;
-import jscl.AngleUnit;
+import jscl.*;
-import jscl.JsclMathEngine;
-import jscl.MathEngine;
-import jscl.NumeralBase;
 import jscl.math.Generic;
 import jscl.math.function.Function;
 import jscl.math.operator.Operator;
@@ -157,13 +154,13 @@ public enum CalculatorEngine {
 	}
 
 	public Result evaluate(@NotNull JsclOperation operation,
-						   @NotNull String expression) throws ParseException {
+						   @NotNull String expression) throws CalculatorParseException, CalculatorEvalException {
 		return evaluate(operation, expression, null);
 	}
 
 	public Result evaluate(@NotNull JsclOperation operation,
 						   @NotNull String expression,
-						   @Nullable MessageRegistry mr) throws ParseException {
+						   @Nullable MessageRegistry mr) throws CalculatorParseException, CalculatorEvalException {
 		synchronized (lock) {
 			final StringBuilder sb = new StringBuilder();
 
@@ -189,9 +186,9 @@ public enum CalculatorEngine {
 			final String jsclExpression = sb.toString();
 			final JsclOperation finalOperation = operation;
 
-			final String result;
 			final MutableObject<Generic> calculationResult = new MutableObject<Generic>(null);
-			final MutableObject<ParseException> exception = new MutableObject<ParseException>(null);
+			final MutableObject<CalculatorParseException> parseException = new MutableObject<CalculatorParseException>(null);
+			final MutableObject<CalculatorEvalException> evalException = new MutableObject<CalculatorEvalException>(null);
 			final MutableObject<Thread> calculationThread = new MutableObject<Thread>(null);
 
 			final CountDownLatch latch = new CountDownLatch(1);
@@ -204,16 +201,23 @@ public enum CalculatorEngine {
 						//Log.d(CalculatorEngine.class.getName(), "Calculation thread started work: " + thread.getName());
 						//System.out.println(jsclExpression);
 						calculationThread.setObject(thread);
-						calculationResult.setObject(finalOperation.evaluateGeneric(jsclExpression));
+						final Generic genericResult = finalOperation.evaluateGeneric(jsclExpression);
+
+						// NOTE: toString() method must be called here as ArithmeticOperationException may occur in it (just to avoid later check!)
+						genericResult.toString();
+
+						calculationResult.setObject(genericResult);
+					} catch (AbstractJsclArithmeticException e) {
+						evalException.setObject(new CalculatorEvalException(e, jsclExpression));
 					} catch (ArithmeticException e) {
 						//System.out.println(e.getMessage());
-						exception.setObject(new ParseException(Messages.msg_1, jsclExpression, e.getMessage()));
+						parseException.setObject(new CalculatorParseException(Messages.msg_1, jsclExpression, e.getMessage()));
 					} catch (StackOverflowError e) {
 						//System.out.println(StringUtils.fromStackTrace(e.getStackTrace()));
-						exception.setObject(new ParseException(Messages.msg_2, jsclExpression));
+						parseException.setObject(new CalculatorParseException(Messages.msg_2, jsclExpression));
 					} catch (jscl.text.ParseException e) {
 						//System.out.println(e.getMessage());
-						exception.setObject(new ParseException(e));
+						parseException.setObject(new CalculatorParseException(e));
 					} catch (ParseInterruptedException e) {
 						//System.out.println(e.getMessage());
 						// do nothing - we ourselves interrupt the calculations
@@ -230,7 +234,8 @@ public enum CalculatorEngine {
 				latch.await(timeout, TimeUnit.MILLISECONDS);
 				//Log.d(CalculatorEngine.class.getName(), "Main thread got up: " + Thread.currentThread().getName());
 
-				final ParseException evalErrorLocal = exception.getObject();
+				final CalculatorParseException parseExceptionObject = parseException.getObject();
+				final CalculatorEvalException evalExceptionObject = evalException.getObject();
 				final Object calculationResultLocal = calculationResult.getObject();
 				final Thread calculationThreadLocal = calculationThread.getObject();
 
@@ -240,19 +245,24 @@ public enum CalculatorEngine {
 					//calculationThreadLocal.stop();
 				}
 
-				if (evalErrorLocal != null) {
+				if (parseExceptionObject != null || evalExceptionObject != null) {
 					if (finalOperation == JsclOperation.numeric && preparedExpression.isExistsUndefinedVar()) {
 						return evaluate(JsclOperation.simplify, expression, mr);
 					}
-					throw evalErrorLocal;
+
+					if (parseExceptionObject != null) {
+						throw parseExceptionObject;
+					} else {
+						throw evalExceptionObject;
+					}
 				}
 
 				if (calculationResultLocal == null) {
-					throw new ParseException(Messages.msg_3, jsclExpression);
+					throw new CalculatorParseException(Messages.msg_3, jsclExpression);
 				}
 
 			} catch (InterruptedException e) {
-				throw new ParseException(Messages.msg_4, jsclExpression);
+				throw new CalculatorParseException(Messages.msg_4, jsclExpression);
 			}
 
 			final Generic genericResult = calculationResult.getObject();

src/main/java/org/solovyev/android/calculator/model/CalculatorEvalException.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ * or visit http://se.solovyev.org
+ */
+
+package org.solovyev.android.calculator.model;
+
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.common.exceptions.SersoException;
+import org.solovyev.common.msg.Message;
+import org.solovyev.common.msg.MessageType;
+
+import java.util.List;
+import java.util.Locale;
+
+/**
+ * User: serso
+ * Date: 12/8/11
+ * Time: 1:27 AM
+ */
+public class CalculatorEvalException extends SersoException implements Message {
+
+	@NotNull
+	private final Message message;
+
+	@NotNull
+	private final String expression;
+
+	public CalculatorEvalException(@NotNull Message message, String expression) {
+		this.message = message;
+		this.expression = expression;
+	}
+
+
+	@NotNull
+	public String getExpression() {
+		return expression;
+	}
+
+	@NotNull
+	@Override
+	public String getMessageCode() {
+		return this.message.getMessageCode();
+	}
+
+	@NotNull
+	@Override
+	public List<Object> getParameters() {
+		return this.message.getParameters();
+	}
+
+	@NotNull
+	@Override
+	public MessageType getMessageType() {
+		return this.message.getMessageType();
+	}
+
+	@Override
+	@NotNull
+	public String getLocalizedMessage() {
+		return this.message.getLocalizedMessage(Locale.getDefault());
+	}
+
+	@NotNull
+	@Override
+	public String getLocalizedMessage(@NotNull Locale locale) {
+		return this.message.getLocalizedMessage(locale);
+	}
+}
+

src/main/java/org/solovyev/android/calculator/model/CalculatorParseException.java

@@ -21,7 +21,7 @@ import java.util.Locale;
  * Date: 10/6/11
  * Time: 9:25 PM
  */
-public class ParseException extends SersoException implements Message {
+public class CalculatorParseException extends SersoException implements Message {
 
 	@NotNull
 	private final Message message;
@@ -32,19 +32,19 @@ public class ParseException extends SersoException implements Message {
 	@Nullable
 	private final Integer position;
 
-	public ParseException(@NotNull jscl.text.ParseException jsclParseException) {
+	public CalculatorParseException(@NotNull jscl.text.ParseException jsclParseException) {
 		this.message = jsclParseException;
 		this.expression = jsclParseException.getExpression();
 		this.position = jsclParseException.getPosition();
 	}
 
-	public ParseException(@NotNull String messageId, @Nullable Integer position, @NotNull String expression, Object... parameters) {
+	public CalculatorParseException(@NotNull String messageId, @Nullable Integer position, @NotNull String expression, Object... parameters) {
 		this.message = new AndroidMessage(messageId, MessageType.error, parameters);
 		this.expression = expression;
 		this.position = position;
 	}
 
-	public ParseException(@NotNull String messageId, @NotNull String expression, Object... parameters) {
+	public CalculatorParseException(@NotNull String messageId, @NotNull String expression, Object... parameters) {
 		this(messageId, null, expression, parameters);
 	}
 

src/main/java/org/solovyev/android/calculator/model/DummyTextProcessor.java

@@ -19,7 +19,7 @@ public enum DummyTextProcessor implements TextProcessor<String> {
 
 	@NotNull
 	@Override
-	public String process(@NotNull String s) throws ParseException {
+	public String process(@NotNull String s) throws CalculatorParseException {
 		return s;
 	}
 }

src/main/java/org/solovyev/android/calculator/model/FromJsclSimplifyTextProcessor.java

@@ -1,7 +1,6 @@
 package org.solovyev.android.calculator.model;
 
 import jscl.MathContext;
-import jscl.MathEngine;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.calculator.math.MathType;
@@ -25,7 +24,7 @@ public class FromJsclSimplifyTextProcessor implements TextProcessor<String> {
 
 	@NotNull
 	@Override
-	public String process(@NotNull String s) throws ParseException {
+	public String process(@NotNull String s) throws CalculatorParseException {
 		final StringBuilder sb = new StringBuilder();
 
 		final NumberBuilder numberBuilder = new NumberBuilder(true, mathContext.getNumeralBase());

src/main/java/org/solovyev/android/calculator/model/TextProcessor.java

@@ -10,5 +10,5 @@ import org.jetbrains.annotations.NotNull;
 public interface TextProcessor<T extends CharSequence> {
 
 	@NotNull
-	T process(@NotNull String s) throws ParseException;
+	T process(@NotNull String s) throws CalculatorParseException;
 }

src/main/java/org/solovyev/android/calculator/model/ToJsclTextProcessor.java

@@ -22,16 +22,16 @@ class ToJsclTextProcessor implements TextProcessor<PreparedExpression> {
 
 	@Override
 	@NotNull
-	public PreparedExpression process(@NotNull String s) throws ParseException {
+	public PreparedExpression process(@NotNull String s) throws CalculatorParseException {
 		return processWithDepth(s, 0, new ArrayList<Var>());
 	}
 
-	private static PreparedExpression processWithDepth(@NotNull String s, int depth, @NotNull List<Var> undefinedVars) throws ParseException {
+	private static PreparedExpression processWithDepth(@NotNull String s, int depth, @NotNull List<Var> undefinedVars) throws CalculatorParseException {
 		return replaceVariables(processExpression(s).toString(), depth, undefinedVars);
 	}
 
 	@NotNull
-	private static StringBuilder processExpression(@NotNull String s) throws ParseException {
+	private static StringBuilder processExpression(@NotNull String s) throws CalculatorParseException {
 		final StartsWithFinder startsWithFinder = new StartsWithFinder(s, 0);
 		final StringBuilder result = new StringBuilder();
 
@@ -57,7 +57,7 @@ class ToJsclTextProcessor implements TextProcessor<PreparedExpression> {
 			if (mathTypeBefore != null &&
 					(mathTypeBefore.getMathType() == MathType.function || mathTypeBefore.getMathType() == MathType.operator) &&
 						CollectionsUtils.find(MathType.openGroupSymbols, startsWithFinder) != null) {
-				throw new ParseException(Messages.msg_5, i, s, mathTypeBefore.getMatch());
+				throw new CalculatorParseException(Messages.msg_5, i, s, mathTypeBefore.getMatch());
 			}
 
 			i = mathTypeResult.processToJscl(result, i);
@@ -66,9 +66,9 @@ class ToJsclTextProcessor implements TextProcessor<PreparedExpression> {
 	}
 
 	@NotNull
-	private static PreparedExpression replaceVariables(@NotNull final String s, int depth, @NotNull List<Var> undefinedVars) throws ParseException {
+	private static PreparedExpression replaceVariables(@NotNull final String s, int depth, @NotNull List<Var> undefinedVars) throws CalculatorParseException {
 		if (depth >= MAX_DEPTH) {
-			throw new ParseException(Messages.msg_6, s);
+			throw new CalculatorParseException(Messages.msg_6, s);
 		} else {
 			depth++;
 		}

src/main/java/org/solovyev/android/calculator/plot/MyXYSeries.java

@@ -136,7 +136,7 @@ public class MyXYSeries extends XYSeries {
 	 * @param x the value for the X axis
 	 * @param y the value for the Y axis
 	 */
-	public synchronized void add(double x, double y) {
+	public void add(double x, double y) {
 		boolean added = false;
 		for (int i = 0; i < mX.size(); i++ ) {
 			if ( mX.get(i) > x ) {
@@ -174,7 +174,7 @@ public class MyXYSeries extends XYSeries {
 	 *
 	 * @param index the index in the series of the value to remove
 	 */
-	public synchronized void remove(int index) {
+	public void remove(int index) {
 		double removedX = mX.remove(index);
 		double removedY = mY.remove(index);
 		if (removedX == mMinX || removedX == mMaxX || removedY == mMinY || removedY == mMaxY) {
@@ -185,7 +185,7 @@ public class MyXYSeries extends XYSeries {
 	/**
 	 * Removes all the existing values from the series.
 	 */
-	public synchronized void clear() {
+	public void clear() {
 		mX.clear();
 		mY.clear();
 		initRange();
@@ -197,7 +197,7 @@ public class MyXYSeries extends XYSeries {
 	 * @param index the index
 	 * @return the X value
 	 */
-	public synchronized double getX(int index) {
+	public double getX(int index) {
 		return mX.get(index);
 	}
 
@@ -207,7 +207,7 @@ public class MyXYSeries extends XYSeries {
 	 * @param index the index
 	 * @return the Y value
 	 */
-	public synchronized double getY(int index) {
+	public double getY(int index) {
 		return mY.get(index);
 	}
 
@@ -216,7 +216,7 @@ public class MyXYSeries extends XYSeries {
 	 *
 	 * @return the series item count
 	 */
-	public synchronized int getItemCount() {
+	public int getItemCount() {
 		return mX == null ? 0 : mX.size();
 	}
 

src/main/java/org/solovyev/android/calculator/plot/PlotUtils.java

@@ -39,7 +39,7 @@ public final class PlotUtils {
 								@NotNull MyXYSeries realSeries,
 								@NotNull MyXYSeries imagSeries,
 								boolean addExtra,
-								int numberOfSteps) {
+								int numberOfSteps) throws ArithmeticException {
 
 		boolean imagExists = false;
 

src/main/java/org/solovyev/android/view/widgets/AngleUnitsButton.java

@@ -12,7 +12,6 @@ import android.graphics.Paint;
 import android.text.TextPaint;
 import android.util.AttributeSet;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.model.CalculatorEngine;
 
@@ -27,21 +26,18 @@ public class AngleUnitsButton extends DirectionDragButton {
 		super(context, attrs);
 	}
 
-	@Nullable
 	@Override
-	protected TextPaint initUpDownTextPaint(@Nullable Paint paint, @NotNull DragDirection direction) {
+	protected void initDirectionTextPaint(@NotNull Paint basePaint,
-		final TextPaint result = super.initUpDownTextPaint(paint, direction);
+										  @NotNull DirectionTextData directionTextData,
+										  @NotNull Resources resources) {
+		super.initDirectionTextPaint(basePaint, directionTextData, resources);
 
-		if (result != null) {
+		final TextPaint directionTextPaint = directionTextData.getPaint();
-			final Resources resources = getResources();
+		if (CalculatorEngine.instance.getEngine().getAngleUnits().name().equals(directionTextData.getText())) {
-			if ( CalculatorEngine.instance.getEngine().getAngleUnits().name().equals(getDirectionText(direction)) ) {
+			directionTextPaint.setColor(resources.getColor(R.color.selected_angle_unit_text_color));
-				result.setColor(resources.getColor(R.color.selected_angle_unit_text_color));
 		} else {
-				result.setColor(resources.getColor(R.color.default_text_color));
+			directionTextPaint.setColor(resources.getColor(R.color.default_text_color));
-				result.setAlpha(getDefaultDirectionTextAlpha());
+			directionTextPaint.setAlpha(getDefaultDirectionTextAlpha());
 		}
 	}
-
-		return result;
-	}
 }

src/main/java/org/solovyev/android/view/widgets/DirectionDragButton.java

@@ -18,6 +18,9 @@ import org.solovyev.android.calculator.R;
 import org.solovyev.common.utils.Point2d;
 import org.solovyev.common.utils.StringUtils;
 
+import java.util.EnumMap;
+import java.util.Map;
+
 /**
  * User: serso
  * Date: 7/17/11
@@ -31,7 +34,10 @@ public class DirectionDragButton extends DragButton {
 	@Nullable
 	private String textMiddle;
 
-	private static class DirectionTextData {
+	protected static class DirectionTextData {
+
+		@NotNull
+		private final GuiDragDirection guiDragDirection;
 
 		@NotNull
 		private String text;
@@ -42,10 +48,16 @@ public class DirectionDragButton extends DragButton {
 		@NotNull
 		private TextPaint paint;
 
-		private DirectionTextData(@NotNull String text) {
+		private DirectionTextData(@NotNull GuiDragDirection guiDragDirection, @NotNull String text) {
+			this.guiDragDirection = guiDragDirection;
 			this.text = text;
 		}
 
+		@NotNull
+		public GuiDragDirection getGuiDragDirection() {
+			return guiDragDirection;
+		}
+
 		@NotNull
 		public String getText() {
 			return text;
@@ -74,89 +86,64 @@ public class DirectionDragButton extends DragButton {
 		}
 	}
 
-	@Nullable
+	protected static enum GuiDragDirection {
-	private Float directionTextScale = DEFAULT_DIRECTION_TEXT_SCALE;
+		up(DragDirection.up) {
-
-	public DirectionDragButton(Context context, @NotNull AttributeSet attrs) {
-		super(context, attrs, false);
-		init(context, attrs);
-	}
-
-	@Nullable
-	public String getDirectionText(@NotNull DragDirection direction) {
-		final String result;
-
-		switch (direction) {
-			case up:
-				result = this.getTextUp();
-				break;
-
-			case down:
-				result = this.getTextDown();
-				break;
-
-			default:
-				result = null;
-				break;
-		}
-
-		return result;
-	}
-
-
-	private void init(@NotNull Context context, @NotNull AttributeSet attrs) {
-
-		TypedArray a = context.obtainStyledAttributes(attrs, org.solovyev.android.calculator.R.styleable.DragButton);
-
-		final int N = a.getIndexCount();
-		for (int i = 0; i < N; i++) {
-			int attr = a.getIndex(i);
-			switch (attr) {
-				case R.styleable.DragButton_textUp:
-					this.textUp = a.getString(attr);
-					break;
-				case R.styleable.DragButton_textDown:
-					this.textDown = a.getString(attr);
-					break;
-				case R.styleable.DragButton_directionTextScale:
-					this.directionTextScale = Float.valueOf(a.getString(attr));
-					break;
-			}
-		}
-
-		// backup text
-		this.textMiddle = String.valueOf(getText());
-
-		super.init(context);
-	}
-
 			@Override
-	protected void measureText() {
+			public int getAttributeId() {
-		super.measureText();
+				return R.styleable.DragButton_textUp;
-
-		final Paint basePaint = getPaint();
-
-		if (textUp != null) {
-			initUpDownTextPaint(basePaint, DragDirection.up);
-			textUpPosition = getTextPosition(upTextPaint, basePaint, textUp, getText(), 1, getWidth(), getHeight(), getDirectionTextScale());
 			}
 
-		if (textDown != null) {
+			@NotNull
-			initUpDownTextPaint(basePaint, DragDirection.down);
+			@Override
-			textDownPosition = getTextPosition(downTextPaint, basePaint, textDown, getText(), -1, getWidth(), getHeight(), getDirectionTextScale());
+			public Point2d getTextPosition(@NotNull Paint paint, @NotNull Paint basePaint, @NotNull CharSequence text, CharSequence baseText, int w, int h) {
+				return getUpDownTextPosition(paint, basePaint, text, baseText, 1, w, h);
+			}
+		},
+		down(DragDirection.down) {
+			@Override
+			public int getAttributeId() {
+				return R.styleable.DragButton_textDown;
 			}
 
-		/*if (textDownPosition != null && textUpPosition != null) {
+			@NotNull
-			if (textDownPosition.getX() > textUpPosition.getX()) {
+			@Override
-				textDownPosition.setX(textUpPosition.getX());
+			public Point2d getTextPosition(@NotNull Paint paint, @NotNull Paint basePaint, @NotNull CharSequence text, CharSequence baseText, int w, int h) {
-			} else {
+				return getUpDownTextPosition(paint, basePaint, text, baseText, -1, w, h);
-				textUpPosition.setX(textDownPosition.getX());
 			}
-		}*/
+		},
-
+		left(DragDirection.left) {
+			@Override
+			public int getAttributeId() {
+				return R.styleable.DragButton_textLeft;
 			}
 
-	public static Point2d getTextPosition(@NotNull Paint paint, @NotNull Paint basePaint, @NotNull CharSequence text, CharSequence baseText, float direction, int w, int h, float scale) {
+			@NotNull
+			@Override
+			public Point2d getTextPosition(@NotNull Paint paint, @NotNull Paint basePaint, @NotNull CharSequence text, CharSequence baseText, int w, int h) {
+				throw new UnsupportedOperationException("Not implemented yet!");
+			}
+		}/*,
+		right(DragDirection.right) {
+			@Override
+			public int getAttributeId() {
+				return 0;
+			}
+		}*/;
+
+		@NotNull
+		private final DragDirection dragDirection;
+
+		GuiDragDirection(@NotNull DragDirection dragDirection) {
+			this.dragDirection = dragDirection;
+		}
+
+		public abstract int getAttributeId();
+
+		@NotNull
+		public abstract Point2d getTextPosition(@NotNull Paint paint, @NotNull Paint basePaint, @NotNull CharSequence text, CharSequence baseText, int w, int h);
+
+		@NotNull
+		private static Point2d getUpDownTextPosition(@NotNull Paint paint, @NotNull Paint basePaint, @NotNull CharSequence text, CharSequence baseText, float direction, int w, int h) {
 			final Point2d result = new Point2d();
 
 			float width = paint.measureText(text.toString() + " ");
@@ -175,48 +162,111 @@ public class DirectionDragButton extends DragButton {
 			return result;
 		}
 
+		@Nullable
+		public static GuiDragDirection valueOf ( @NotNull DragDirection dragDirection ) {
+			for (GuiDragDirection guiDragDirection : values()) {
+				if ( guiDragDirection.dragDirection == dragDirection ) {
+					return guiDragDirection;
+				}
+			}
+			return null;
+		}
+	}
+
+	@NotNull
+	private final Map<GuiDragDirection, DirectionTextData> directionTextDataMap = new EnumMap<GuiDragDirection, DirectionTextData>(GuiDragDirection.class);
+
+	@NotNull
+	private Float directionTextScale = DEFAULT_DIRECTION_TEXT_SCALE;
+
+	private boolean initialized = false;
+
+	public DirectionDragButton(Context context, @NotNull AttributeSet attrs) {
+		super(context, attrs, false);
+		init(context, attrs);
+	}
+
+	private void init(@NotNull Context context, @NotNull AttributeSet attrs) {
+
+		TypedArray a = context.obtainStyledAttributes(attrs, org.solovyev.android.calculator.R.styleable.DragButton);
+
+		final int N = a.getIndexCount();
+		for (int i = 0; i < N; i++) {
+			int attr = a.getIndex(i);
+
+			final String attrValue = a.getString(attr);
+
+			if (!StringUtils.isEmpty(attrValue)) {
+				switch (attr) {
+					case R.styleable.DragButton_directionTextScale:
+						this.directionTextScale = Float.valueOf(attrValue);
+						break;
+					default:
+						// try drag direction text
+						for (GuiDragDirection guiDragDirection : GuiDragDirection.values()) {
+							if ( guiDragDirection.getAttributeId() == attr ) {
+								this.directionTextDataMap.put(guiDragDirection, new DirectionTextData(guiDragDirection, attrValue));
+								break;
+							}
+						}
+						break;
+				}
+			}
+		}
+
+		// backup text
+		this.textMiddle = String.valueOf(getText());
+
+		super.init(context);
+		initialized = true;
+	}
+
+	@Override
+	protected void measureText() {
+		super.measureText();
+
+		if (initialized) {
+			final Paint basePaint = getPaint();
+			final Resources resources = getResources();
+
+			for (DirectionTextData directionTextData : directionTextDataMap.values()) {
+				initDirectionTextPaint(basePaint, directionTextData, resources);
+
+				final GuiDragDirection guiDragDirection = directionTextData.getGuiDragDirection();
+				final String directionText = directionTextData.getText();
+				final Paint directionPaint = directionTextData.getPaint();
+
+				directionTextData.setPosition(guiDragDirection.getTextPosition(directionPaint, basePaint, directionText, getText(), getWidth(), getHeight()));
+			}
+		}
+	}
+
+
 	@Override
 	public void onDraw(Canvas canvas) {
 		super.onDraw(canvas);
 
-
+		final TextPaint paint = getPaint();
-		if (textUp != null && textUpPosition != null) {
-			initUpDownTextPaint(null, DragDirection.up);
-			canvas.drawText(textUp, 0, textUp.length(), textUpPosition.getX(), textUpPosition.getY(), upTextPaint);
-		}
-
-		if (textDown != null && textDownPosition != null) {
-			initUpDownTextPaint(null, DragDirection.down);
-			canvas.drawText(textDown, 0, textDown.length(), textDownPosition.getX(), textDownPosition.getY(), downTextPaint);
-		}
-	}
-
-	@Nullable
-	protected TextPaint initUpDownTextPaint(@Nullable Paint paint, @NotNull DragDirection direction) {
-		if (paint == null) {
-			paint = getPaint();
-		}
-
 		final Resources resources = getResources();
-		if (direction == DragDirection.up) {
+
-			upTextPaint = getUpDownTextPaint(paint, resources, getDirectionTextScale());
+		for (DirectionTextData directionTextData : directionTextDataMap.values()) {
-			return upTextPaint;
+			initDirectionTextPaint(paint, directionTextData, resources);
-		} else if (direction == DragDirection.down) {
+			final String text = directionTextData.getText();
-			downTextPaint = getUpDownTextPaint(paint, resources, getDirectionTextScale());
+			final Point2d position = directionTextData.getPosition();
-			return downTextPaint;
+			canvas.drawText(text, 0, text.length(), position.getX(), position.getY(), directionTextData.getPaint());
+		}
 	}
 
-		return null;
+	protected void initDirectionTextPaint(@NotNull Paint basePaint,
-	}
+										  @NotNull DirectionTextData directionTextData,
+										  @NotNull Resources resources) {
+		final TextPaint directionTextPaint = new TextPaint(basePaint);
 
-	@NotNull
+		directionTextPaint.setColor(resources.getColor(R.color.button_text_color));
-	private static TextPaint getUpDownTextPaint(@NotNull Paint basePaint, @NotNull Resources resources, @NotNull Float directionTextScale) {
+		directionTextPaint.setAlpha(getDefaultDirectionTextAlpha());
-		final TextPaint result = new TextPaint(basePaint);
+		directionTextPaint.setTextSize(basePaint.getTextSize() * getDirectionTextScale());
-		result.setColor(resources.getColor(R.color.button_text_color));
-		result.setAlpha(getDefaultDirectionTextAlpha());
-		result.setTextSize(basePaint.getTextSize() * directionTextScale);
 
-		return result;
+		directionTextData.setPaint(directionTextPaint);
 	}
 
 	protected static int getDefaultDirectionTextAlpha() {
@@ -225,12 +275,12 @@ public class DirectionDragButton extends DragButton {
 
 	@Nullable
 	public String getTextUp() {
-		return textUp;
+		return getText(GuiDragDirection.up);
 	}
 
 	@Nullable
 	public String getTextDown() {
-		return textDown;
+		return getText(GuiDragDirection.down);
 	}
 
 	@Nullable
@@ -240,22 +290,20 @@ public class DirectionDragButton extends DragButton {
 
 	@Nullable
 	public String getText(@NotNull DragDirection direction) {
-		final String result;
+		final GuiDragDirection guiDragDirection = GuiDragDirection.valueOf(direction);
-
+		return guiDragDirection == null ? null : getText(guiDragDirection);
-		if (direction == DragDirection.up) {
-			result = getTextUp();
-		} else if (direction == DragDirection.down) {
-			result = getTextDown();
-		} else {
-			result = null;
 	}
 
-		return result;
+	@Nullable
+	private String getText(@NotNull GuiDragDirection direction) {
+		DirectionTextData directionTextData = this.directionTextDataMap.get(direction);
+		return directionTextData == null ? null : directionTextData.getText();
 	}
 
+
 	@NotNull
 	public Float getDirectionTextScale() {
-		return directionTextScale == null ? DEFAULT_DIRECTION_TEXT_SCALE : directionTextScale;
+		return directionTextScale;
 	}
 
 }

src/main/java/org/solovyev/android/view/widgets/VibratorContainer.java

@@ -20,6 +20,7 @@ import org.solovyev.common.NumberMapper;
 public class VibratorContainer implements SharedPreferences.OnSharedPreferenceChangeListener {
 
 	public static final String HAPTIC_FEEDBACK_P_KEY = "org.solovyev.android.calculator.CalculatorModel_haptic_feedback";
+	public static final boolean HAPTIC_FEEDBACK_DEFAULT = false;
 	public static final String HAPTIC_FEEDBACK_DURATION_P_KEY = "org.solovyev.android.calculator.CalculatorActivity_calc_haptic_feedback_duration_key";
 
 	private final static NumberMapper<Long> mapper = new NumberMapper<Long>(Long.class);
@@ -50,7 +51,7 @@ public class VibratorContainer implements SharedPreferences.OnSharedPreferenceCh
 
 	@Override
 	public void onSharedPreferenceChanged(SharedPreferences preferences, @Nullable String key) {
-		if (preferences.getBoolean(HAPTIC_FEEDBACK_P_KEY, false)) {
+		if (preferences.getBoolean(HAPTIC_FEEDBACK_P_KEY, VibratorContainer.HAPTIC_FEEDBACK_DEFAULT)) {
 			//noinspection ConstantConditions
 			this.time = getScaledValue(mapper.parseValue(preferences.getString(HAPTIC_FEEDBACK_DURATION_P_KEY, mapper.formatValue(getScaledValue(defaultVibrationTime)))));
 		} else {

src/test/java/org/solovyev/android/calculator/model/CalculatorEngineTest.java

@@ -6,6 +6,7 @@
 package org.solovyev.android.calculator.model;
 
 import jscl.AngleUnit;
+import jscl.NumeralBase;
 import jscl.math.Expression;
 import jscl.math.Generic;
 import jscl.math.function.Constant;
@@ -41,7 +42,7 @@ public class CalculatorEngineTest {
 		try {
 			cm.evaluate(JsclOperation.numeric, "3^10^10^10");
 			Assert.fail();
-		} catch (ParseException e) {
+		} catch (CalculatorParseException e) {
 			if (e.getMessageCode().equals(Messages.msg_3)) {
 
 			} else {
@@ -53,7 +54,7 @@ public class CalculatorEngineTest {
 		try {
 			cm.evaluate(JsclOperation.numeric, "9999999!");
 			Assert.fail();
-		} catch (ParseException e) {
+		} catch (CalculatorParseException e) {
 			if (e.getMessageCode().equals(Messages.msg_3)) {
 
 			} else {
@@ -136,7 +137,7 @@ public class CalculatorEngineTest {
 		try {
 			junit.framework.Assert.assertEquals("√(-1)!", cm.evaluate(JsclOperation.numeric, "i!").getResult());
 			fail();
-		} catch (ParseException e) {
+		} catch (CalculatorParseException e) {
 		}
 
 		junit.framework.Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "(π/π)!").getResult());
@@ -144,7 +145,7 @@ public class CalculatorEngineTest {
 		try {
 			junit.framework.Assert.assertEquals("i", cm.evaluate(JsclOperation.numeric, "(-1)i!").getResult());
 			fail();
-		} catch (ParseException e) {
+		} catch (CalculatorParseException e) {
 
 		}
 		junit.framework.Assert.assertEquals("24i", cm.evaluate(JsclOperation.numeric, "4!i").getResult());
@@ -213,7 +214,7 @@ public class CalculatorEngineTest {
 	}
 
 	@Test
-	public void testI() throws ParseException {
+	public void testI() throws CalculatorParseException, CalculatorEvalException {
 		final CalculatorEngine cm = CalculatorEngine.instance;
 
 		Assert.assertEquals("-i", cm.evaluate(JsclOperation.numeric, "i^3").getResult());
@@ -243,13 +244,13 @@ public class CalculatorEngineTest {
 		try {
 			cm.evaluate(JsclOperation.numeric, "cos(cos(cos(cos(acos(acos(acos(acos(acos(acos(acos(acos(cos(cos(cos(cos(cosh(acos(cos(cos(cos(cos(cos(acos(acos(acos(acos(acos(acos(acos(acos(cos(cos(cos(cos(cosh(acos(cos())))))))))))))))))))))))))))))))))))))");
 			Assert.fail();
-		} catch (ParseException e) {
+		} catch (CalculatorParseException e) {
 		}
 		Assert.assertEquals("0.34+1.382i", cm.evaluate(JsclOperation.numeric, "ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(100)))))))))))))))").getResult());
 		try {
 			cm.evaluate(JsclOperation.numeric, "cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos())))))))))))))))))))))))))))))))))))");
 			Assert.fail();
-		} catch (ParseException e) {
+		} catch (CalculatorParseException e) {
 		}
 
 		final AngleUnit defaultAngleUnit = cm.getEngine().getAngleUnits();
@@ -266,7 +267,7 @@ public class CalculatorEngineTest {
 		try {
 			cm.evaluate(JsclOperation.numeric, "sin");
 			Assert.fail();
-		} catch (ParseException e) {
+		} catch (CalculatorParseException e) {
 		}
 	}
 
@@ -334,7 +335,7 @@ public class CalculatorEngineTest {
 			try {
 				Assert.assertEquals("0.017", cm.evaluate(JsclOperation.numeric, "°"));
 				fail();
-			} catch (ParseException e) {
+		} catch (CalculatorParseException e) {
 
 			}
 
@@ -345,7 +346,7 @@ public class CalculatorEngineTest {
 			try {
 				Assert.assertEquals("∂(cos(t), t, t,1°)", cm.evaluate(JsclOperation.numeric, "∂(cos(t),t,t,1°)").getResult());
 				fail();
-			} catch (ParseException e) {
+			} catch (CalculatorParseException e) {
 			}
 
 			Assert.assertEquals("∂(cos(t), t, t,1°)", cm.evaluate(JsclOperation.simplify, "∂(cos(t),t,t,1°)").getResult());
@@ -353,4 +354,23 @@ public class CalculatorEngineTest {
 			cm.getEngine().setAngleUnits(defaultAngleUnit);
 		}
 	}
+
+	@Test
+	public void testNumeralSystems() throws Exception {
+		final CalculatorEngine cm = CalculatorEngine.instance;
+
+		final NumeralBase defaultNumeralBase = cm.getEngine().getNumeralBase();
+		try{
+			cm.getEngine().setNumeralBase(NumeralBase.bin);
+			Assert.assertEquals("101", cm.evaluate(JsclOperation.numeric, "10+11").getResult());
+			try {
+				cm.evaluate(JsclOperation.numeric, "10/11");
+				fail();
+			} catch (CalculatorParseException e) {
+				// ok
+			}
+		} finally {
+			cm.setNumeralBase(defaultNumeralBase);
+		}
+	}
 }

src/test/java/org/solovyev/android/calculator/model/ToJsclTextProcessorTest.java

@@ -23,7 +23,7 @@ public class ToJsclTextProcessorTest {
 	}
 
 	@Test
-	public void testSpecialCases() throws ParseException {
+	public void testSpecialCases() throws CalculatorParseException {
 		final ToJsclTextProcessor preprocessor = new ToJsclTextProcessor();
 		Assert.assertEquals( "3^E10", preprocessor.process("3^E10").toString());
 	}
@@ -62,30 +62,30 @@ public class ToJsclTextProcessorTest {
 		try {
 			preprocessor.process("ln()");
 			Assert.fail();
-		} catch (ParseException e) {
+		} catch (CalculatorParseException e) {
 		}
 		try {
 			preprocessor.process("ln()ln()");
 			Assert.fail();
-		} catch (ParseException e) {
+		} catch (CalculatorParseException e) {
 		}
 
 		try {
 			preprocessor.process("eln()eln()ln()ln()ln()e");
 			Assert.fail();
-		} catch (ParseException e) {
+		} catch (CalculatorParseException e) {
 		}
 
 		try {
 			preprocessor.process("ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln()))))))))))))))");
 			Assert.fail();
-		} catch (ParseException e) {
+		} catch (CalculatorParseException e) {
 		}
 
 		try {
 			preprocessor.process("cos(cos(cos(cos(acos(acos(acos(acos(acos(acos(acos(acos(cos(cos(cos(cos(cosh(acos(cos(cos(cos(cos(cos(acos(acos(acos(acos(acos(acos(acos(acos(cos(cos(cos(cos(cosh(acos(cos())))))))))))))))))))))))))))))))))))))");
 			Assert.fail();
-		} catch (ParseException e) {
+		} catch (CalculatorParseException e) {
 		}
 	}