From 8d15db4c3f9525e9cae713fdd00502db20b40f92 Mon Sep 17 00:00:00 2001
From: Sergey Solovyev <se.solovyev@gmail.com>
Date: Fri, 28 Jun 2013 00:02:30 +0400
Subject: [PATCH] number formatting is working now

---
 android-app-core/res/values/styles.xml        |  2 +-
 .../AndroidCalculatorDisplayView.java         |  5 +-
 .../AndroidCalculatorEditorView.java          | 70 +----------------
 .../calculator/CalculatorPreferences.java     |  1 +
 .../ParcelableCalculatorEditorViewState.java  |  6 ++
 .../calculator/view/EditorTextProcessor.java  | 75 +++++++++++++++++++
 .../calculator/view/TextHighlighter.java      | 71 +++---------------
 .../onscreen/CalculatorOnscreenService.java   | 63 ++++++----------
 .../onscreen/CalculatorOnscreenView.java      | 12 +--
 .../AbstractCalculatorWidgetProvider.java     |  4 +-
 .../android/calculator/AndroidCalculator.java |  8 +-
 .../calculator/CalculatorApplication.java     | 13 ++--
 .../calculator/CalculatorTestUtils.java       |  4 +-
 .../android/calculator/CalculatorEditor.java  |  7 +-
 .../CalculatorEditorChangeEventData.java      | 33 +++++++-
 .../CalculatorEditorChangeEventDataImpl.java  | 57 --------------
 .../calculator/CalculatorEditorImpl.java      | 44 ++++++++---
 .../calculator/CalculatorEditorViewState.java |  3 +
 .../CalculatorEditorViewStateImpl.java        | 10 ++-
 .../android/calculator/CalculatorLocator.java | 10 ++-
 .../solovyev/android/calculator/Locator.java  |  8 +-
 .../text/TextProcessorEditorResult.java       | 58 ++++++++++++++
 .../calculator/AbstractCalculatorTest.java    |  2 +-
 .../calculator/CalculatorEditorImplTest.java  |  6 +-
 .../calculator/CalculatorTestUtils.java       |  2 +-
 25 files changed, 301 insertions(+), 273 deletions(-)
 create mode 100644 android-app-core/src/main/java/org/solovyev/android/calculator/view/EditorTextProcessor.java
 delete mode 100644 core/src/main/java/org/solovyev/android/calculator/CalculatorEditorChangeEventDataImpl.java
 create mode 100644 core/src/main/java/org/solovyev/android/calculator/text/TextProcessorEditorResult.java

diff --git a/android-app-core/res/values/styles.xml b/android-app-core/res/values/styles.xml
index cc5ab903..265df1c0 100644
--- a/android-app-core/res/values/styles.xml
+++ b/android-app-core/res/values/styles.xml
@@ -62,7 +62,7 @@
 	</style>
 
 	<style name="cpp_onscreen_editor_style" parent="cpp_editor_style">
-		<item name="android:ellipsize">end</item>
+		<item name="android:ellipsize">none</item>
 		<item name="android:singleLine">true</item>
 		<item name="android:maxLines">1</item>
 		<item name="android:minLines">1</item>
diff --git a/android-app-core/src/main/java/org/solovyev/android/calculator/AndroidCalculatorDisplayView.java b/android-app-core/src/main/java/org/solovyev/android/calculator/AndroidCalculatorDisplayView.java
index ed98f16e..b70643e6 100644
--- a/android-app-core/src/main/java/org/solovyev/android/calculator/AndroidCalculatorDisplayView.java
+++ b/android-app-core/src/main/java/org/solovyev/android/calculator/AndroidCalculatorDisplayView.java
@@ -35,6 +35,7 @@ import android.util.TypedValue;
 import org.solovyev.android.calculator.core.R;
 import org.solovyev.android.calculator.text.TextProcessor;
 import org.solovyev.android.calculator.view.TextHighlighter;
+import org.solovyev.android.calculator.text.TextProcessorEditorResult;
 import org.solovyev.android.view.AutoResizeTextView;
 
 import javax.annotation.Nonnull;
@@ -59,7 +60,7 @@ public class AndroidCalculatorDisplayView extends AutoResizeTextView implements
 	*/
 
 	@Nonnull
-	private final static TextProcessor<TextHighlighter.Result, String> textHighlighter = new TextHighlighter(Color.WHITE, false);
+	private final static TextProcessor<TextProcessorEditorResult, String> textHighlighter = new TextHighlighter(Color.WHITE, false);
 
 	/*
 	**********************************************************************
@@ -169,7 +170,7 @@ public class AndroidCalculatorDisplayView extends AutoResizeTextView implements
 			//Log.d(this.getClass().getName(), text);
 
 			try {
-				final TextHighlighter.Result processedText = textHighlighter.process(text);
+				final TextProcessorEditorResult processedText = textHighlighter.process(text);
 				text = processedText.toString();
 				result = Html.fromHtml(text);
 			} catch (CalculatorParseException e) {
diff --git a/android-app-core/src/main/java/org/solovyev/android/calculator/AndroidCalculatorEditorView.java b/android-app-core/src/main/java/org/solovyev/android/calculator/AndroidCalculatorEditorView.java
index d529bd42..46be8b9d 100644
--- a/android-app-core/src/main/java/org/solovyev/android/calculator/AndroidCalculatorEditorView.java
+++ b/android-app-core/src/main/java/org/solovyev/android/calculator/AndroidCalculatorEditorView.java
@@ -23,44 +23,26 @@
 package org.solovyev.android.calculator;
 
 import android.content.Context;
-import android.content.SharedPreferences;
-import android.graphics.Color;
 import android.os.Build;
 import android.os.Handler;
-import android.preference.PreferenceManager;
 import android.text.Editable;
-import android.text.Html;
 import android.text.TextWatcher;
 import android.util.AttributeSet;
-import android.util.Log;
 import android.view.ContextMenu;
 import android.widget.EditText;
-
-import org.solovyev.android.calculator.text.TextProcessor;
-import org.solovyev.android.calculator.view.TextHighlighter;
-import org.solovyev.android.prefs.BooleanPreference;
 import org.solovyev.common.collections.Collections;
 
 import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 
 /**
  * User: serso
  * Date: 9/17/11
  * Time: 12:25 AM
  */
-public class AndroidCalculatorEditorView extends EditText implements SharedPreferences.OnSharedPreferenceChangeListener, CalculatorEditorView {
-
-	@Nonnull
-	private static final BooleanPreference colorDisplay = BooleanPreference.of("org.solovyev.android.calculator.CalculatorModel_color_display", true);
+public class AndroidCalculatorEditorView extends EditText implements CalculatorEditorView {
 
 	private volatile boolean initialized = false;
 
-	private boolean highlightText = true;
-
-	@Nonnull
-	private final static TextProcessor<TextHighlighter.Result, String> textHighlighter = new TextHighlighter(Color.WHITE, false);
-
 	@SuppressWarnings("UnusedDeclaration")
 	@Nonnull
 	private volatile CalculatorEditorViewState viewState = CalculatorEditorViewStateImpl.newDefaultInstance();
@@ -113,57 +95,15 @@ public class AndroidCalculatorEditorView extends EditText implements SharedPrefe
 		menu.removeItem(android.R.id.selectAll);
 	}
 
-	@Nullable
-	private CharSequence prepareText(@Nonnull String text, boolean highlightText) {
-		CharSequence result;
-
-		if (highlightText) {
-
-			try {
-				final TextHighlighter.Result processesText = textHighlighter.process(text);
-
-				assert processesText.getOffset() == 0;
-
-				result = Html.fromHtml(processesText.toString());
-			} catch (CalculatorParseException e) {
-				// set raw text
-				result = text;
-
-				Log.e(this.getClass().getName(), e.getMessage(), e);
-			}
-		} else {
-			result = text;
-		}
-
-		return result;
-	}
-
-	public boolean isHighlightText() {
-		return highlightText;
-	}
-
 	public void setHighlightText(boolean highlightText) {
-		this.highlightText = highlightText;
+		//this.highlightText = highlightText;
 		Locator.getInstance().getEditor().updateViewState();
 	}
 
-	@Override
-	public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {
-		if (colorDisplay.getKey().equals(key)) {
-			this.setHighlightText(colorDisplay.getPreference(preferences));
-		}
-	}
-
-	public synchronized void init(@Nonnull Context context) {
+	public synchronized void init() {
 		if (!initialized) {
-			final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
-
-			preferences.registerOnSharedPreferenceChangeListener(this);
-
 			this.addTextChangedListener(new TextWatcherImpl());
 
-			onSharedPreferenceChanged(preferences, colorDisplay.getKey());
-
 			initialized = true;
 		}
 	}
@@ -172,8 +112,6 @@ public class AndroidCalculatorEditorView extends EditText implements SharedPrefe
 	public void setState(@Nonnull final CalculatorEditorViewState viewState) {
 		synchronized (this) {
 
-			final CharSequence text = prepareText(viewState.getText(), highlightText);
-
 			uiHandler.post(new Runnable() {
 				@Override
 				public void run() {
@@ -182,7 +120,7 @@ public class AndroidCalculatorEditorView extends EditText implements SharedPrefe
 						try {
 							editorView.viewStateChange = true;
 							editorView.viewState = viewState;
-							editorView.setText(text, BufferType.EDITABLE);
+							editorView.setText(viewState.getTextAsCharSequence(), BufferType.EDITABLE);
 							final int selection = CalculatorEditorImpl.correctSelection(viewState.getSelection(), editorView.getText());
 							editorView.setSelection(selection);
 						} finally {
diff --git a/android-app-core/src/main/java/org/solovyev/android/calculator/CalculatorPreferences.java b/android-app-core/src/main/java/org/solovyev/android/calculator/CalculatorPreferences.java
index ae040c24..fdbfa1b5 100644
--- a/android-app-core/src/main/java/org/solovyev/android/calculator/CalculatorPreferences.java
+++ b/android-app-core/src/main/java/org/solovyev/android/calculator/CalculatorPreferences.java
@@ -84,6 +84,7 @@ public final class CalculatorPreferences {
 		public static final Preference<Boolean> autoOrientation = BooleanPreference.of("autoOrientation", true);
 		public static final Preference<Boolean> hideNumeralBaseDigits = BooleanPreference.of("hideNumeralBaseDigits", true);
 		public static final Preference<Boolean> preventScreenFromFading = BooleanPreference.of("preventScreenFromFading", true);
+		public static final Preference<Boolean> colorDisplay = BooleanPreference.of("org.solovyev.android.calculator.CalculatorModel_color_display", true);
 
 		@Nonnull
 		public static Theme getTheme(@Nonnull SharedPreferences preferences) {
diff --git a/android-app-core/src/main/java/org/solovyev/android/calculator/ParcelableCalculatorEditorViewState.java b/android-app-core/src/main/java/org/solovyev/android/calculator/ParcelableCalculatorEditorViewState.java
index 7141835e..069a9a26 100644
--- a/android-app-core/src/main/java/org/solovyev/android/calculator/ParcelableCalculatorEditorViewState.java
+++ b/android-app-core/src/main/java/org/solovyev/android/calculator/ParcelableCalculatorEditorViewState.java
@@ -66,6 +66,12 @@ public final class ParcelableCalculatorEditorViewState implements CalculatorEdit
 		return viewState.getText();
 	}
 
+	@Nonnull
+	@Override
+	public CharSequence getTextAsCharSequence() {
+		return getText();
+	}
+
 	@Override
 	public int getSelection() {
 		return viewState.getSelection();
diff --git a/android-app-core/src/main/java/org/solovyev/android/calculator/view/EditorTextProcessor.java b/android-app-core/src/main/java/org/solovyev/android/calculator/view/EditorTextProcessor.java
new file mode 100644
index 00000000..f64f162c
--- /dev/null
+++ b/android-app-core/src/main/java/org/solovyev/android/calculator/view/EditorTextProcessor.java
@@ -0,0 +1,75 @@
+package org.solovyev.android.calculator.view;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.preference.PreferenceManager;
+import android.text.Html;
+import android.util.Log;
+import org.solovyev.android.calculator.CalculatorParseException;
+import org.solovyev.android.calculator.text.TextProcessor;
+import org.solovyev.android.calculator.text.TextProcessorEditorResult;
+
+import javax.annotation.Nonnull;
+
+import static org.solovyev.android.calculator.CalculatorPreferences.Gui.colorDisplay;
+import static org.solovyev.android.calculator.view.TextHighlighter.WHITE;
+
+/**
+ * User: serso
+ * Date: 6/27/13
+ * Time: 6:11 PM
+ */
+public final class EditorTextProcessor implements TextProcessor<TextProcessorEditorResult, String>, SharedPreferences.OnSharedPreferenceChangeListener {
+
+	private boolean highlightText = true;
+
+	private final TextProcessor<TextProcessorEditorResult, String> textHighlighter = new TextHighlighter(WHITE, true);
+
+	public EditorTextProcessor() {
+	}
+
+	public void init(@Nonnull Context context) {
+		final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
+		preferences.registerOnSharedPreferenceChangeListener(this);
+		onSharedPreferenceChanged(preferences, colorDisplay.getKey());
+	}
+
+	@Nonnull
+	@Override
+	public TextProcessorEditorResult process(@Nonnull String text) throws CalculatorParseException {
+		TextProcessorEditorResult result;
+
+		if (highlightText) {
+
+			try {
+				final TextProcessorEditorResult processesText = textHighlighter.process(text);
+
+				result = new TextProcessorEditorResult(Html.fromHtml(processesText.toString()), processesText.getOffset());
+			} catch (CalculatorParseException e) {
+				// set raw text
+				result = new TextProcessorEditorResult(text, 0);
+
+				Log.e(this.getClass().getName(), e.getMessage(), e);
+			}
+		} else {
+			result = new TextProcessorEditorResult(text, 0);
+		}
+
+		return result;
+	}
+
+	public boolean isHighlightText() {
+		return highlightText;
+	}
+
+	public void setHighlightText(boolean highlightText) {
+		this.highlightText = highlightText;
+	}
+
+	@Override
+	public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {
+		if (colorDisplay.getKey().equals(key)) {
+			this.setHighlightText(colorDisplay.getPreference(preferences));
+		}
+	}
+}
diff --git a/android-app-core/src/main/java/org/solovyev/android/calculator/view/TextHighlighter.java b/android-app-core/src/main/java/org/solovyev/android/calculator/view/TextHighlighter.java
index 7cf98f0a..c08c314f 100644
--- a/android-app-core/src/main/java/org/solovyev/android/calculator/view/TextHighlighter.java
+++ b/android-app-core/src/main/java/org/solovyev/android/calculator/view/TextHighlighter.java
@@ -22,14 +22,14 @@
 
 package org.solovyev.android.calculator.view;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
-
 import org.solovyev.android.calculator.*;
 import org.solovyev.android.calculator.math.MathType;
 import org.solovyev.android.calculator.text.TextProcessor;
+import org.solovyev.android.calculator.text.TextProcessorEditorResult;
 import org.solovyev.common.MutableObject;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -38,7 +38,9 @@ import java.util.Map;
  * Date: 10/12/11
  * Time: 9:47 PM
  */
-public class TextHighlighter implements TextProcessor<TextHighlighter.Result, String> {
+public class TextHighlighter implements TextProcessor<TextProcessorEditorResult, String> {
+
+	public static final int WHITE = -1;
 
 	private static final Map<String, String> nbFontAttributes = new HashMap<String, String>();
 
@@ -46,54 +48,6 @@ public class TextHighlighter implements TextProcessor<TextHighlighter.Result, St
 		nbFontAttributes.put("color", "#008000");
 	}
 
-	public static class Result implements CharSequence {
-
-		@Nonnull
-		private final CharSequence charSequence;
-
-		@Nullable
-		private String string;
-
-		private final int offset;
-
-		public Result(@Nonnull CharSequence charSequence, int offset) {
-			this.charSequence = charSequence;
-			this.offset = offset;
-		}
-
-		@Override
-		public int length() {
-			return charSequence.length();
-		}
-
-		@Override
-		public char charAt(int i) {
-			return charSequence.charAt(i);
-		}
-
-		@Override
-		public CharSequence subSequence(int i, int i1) {
-			return charSequence.subSequence(i, i1);
-		}
-
-		@Override
-		public String toString() {
-			if (string == null) {
-				string = charSequence.toString();
-			}
-			return string;
-		}
-
-		@Nonnull
-		public CharSequence getCharSequence() {
-			return charSequence;
-		}
-
-		public int getOffset() {
-			return offset;
-		}
-	}
-
 	private final int color;
 	private final int colorRed;
 	private final int colorGreen;
@@ -113,7 +67,7 @@ public class TextHighlighter implements TextProcessor<TextHighlighter.Result, St
 
 	@Nonnull
 	@Override
-	public Result process(@Nonnull String text) throws CalculatorParseException {
+	public TextProcessorEditorResult process(@Nonnull String text) throws CalculatorParseException {
 		final CharSequence result;
 
 		int maxNumberOfOpenGroupSymbols = 0;
@@ -186,20 +140,17 @@ public class TextHighlighter implements TextProcessor<TextHighlighter.Result, St
 
 			final StringBuilder text2 = new StringBuilder(text1.length());
 
-			final CharSequence s = text1;
-			int i = processBracketGroup(text2, s, 0, 0, maxNumberOfOpenGroupSymbols);
-			for (; i < s.length(); i++) {
-				text2.append(s.charAt(i));
+			int i = processBracketGroup(text2, text1, 0, 0, maxNumberOfOpenGroupSymbols);
+			for (; i < text1.length(); i++) {
+				text2.append(text1.charAt(i));
 			}
 
-			//Log.d(AndroidCalculatorEditorView.class.getName(), text2.toString());
-
 			result = text2.toString();
 		} else {
 			result = text1.toString();
 		}
 
-		return new Result(result, resultOffset);
+		return new TextProcessorEditorResult(result, resultOffset);
 	}
 
 	private int processHighlightedText(@Nonnull StringBuilder result, int i, @Nonnull String match, @Nonnull String tag, @Nullable Map<String, String> tagAttributes) {
diff --git a/android-app-onscreen/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenService.java b/android-app-onscreen/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenService.java
index 29afaf39..6a7bc2c5 100644
--- a/android-app-onscreen/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenService.java
+++ b/android-app-onscreen/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenService.java
@@ -31,35 +31,26 @@ import android.os.IBinder;
 import android.support.v4.app.NotificationCompat;
 import android.util.DisplayMetrics;
 import android.view.WindowManager;
+import org.solovyev.android.Views;
+import org.solovyev.android.calculator.*;
+import org.solovyev.android.calculator.external.AndroidExternalListenersContainer;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-import org.solovyev.android.Views;
-import org.solovyev.android.calculator.CalculatorDisplayViewState;
-import org.solovyev.android.calculator.CalculatorEditorViewState;
-import org.solovyev.android.calculator.Locator;
-import org.solovyev.android.calculator.external.AndroidExternalListenersContainer;
-import org.solovyev.android.calculator.external.DefaultExternalCalculatorIntentHandler;
-import org.solovyev.android.calculator.external.ExternalCalculatorIntentHandler;
-import org.solovyev.android.calculator.external.ExternalCalculatorStateUpdater;
+import static org.solovyev.android.calculator.external.AndroidExternalListenersContainer.INIT_ACTION;
 
 /**
  * User: serso
  * Date: 11/20/12
  * Time: 9:42 PM
  */
-public class CalculatorOnscreenService extends Service implements ExternalCalculatorStateUpdater, OnscreenViewListener {
+public class CalculatorOnscreenService extends Service implements OnscreenViewListener, CalculatorEventListener {
 
 	private static final int NOTIFICATION_ID = 9031988; // my birthday =)
 
-	@Nonnull
-	private final ExternalCalculatorIntentHandler intentHandler = new DefaultExternalCalculatorIntentHandler(this);
 	public static final Class<CalculatorOnscreenBroadcastReceiver> INTENT_LISTENER_CLASS = CalculatorOnscreenBroadcastReceiver.class;
 
-	@Nullable
-	private static String cursorColor;
-
 	@Nonnull
 	private CalculatorOnscreenView view;
 
@@ -96,7 +87,7 @@ public class CalculatorOnscreenService extends Service implements ExternalCalcul
 			final int width = Math.min(width0, height0);
 			final int height = Math.max(width0, height0);
 
-			view = CalculatorOnscreenView.newInstance(this, CalculatorOnscreenViewState.newInstance(width, height, -1, -1), getCursorColor(this), this);
+			view = CalculatorOnscreenView.newInstance(this, CalculatorOnscreenViewState.newInstance(width, height, -1, -1), this);
 			view.show();
 
 			startCalculatorListening();
@@ -110,7 +101,7 @@ public class CalculatorOnscreenService extends Service implements ExternalCalcul
 	}
 
 	private void startCalculatorListening() {
-		Locator.getInstance().getExternalListenersContainer().addExternalListener(getIntentListenerClass());
+		Locator.getInstance().getCalculator().addCalculatorEventListener(this);
 	}
 
 	@Nonnull
@@ -119,7 +110,7 @@ public class CalculatorOnscreenService extends Service implements ExternalCalcul
 	}
 
 	private void stopCalculatorListening() {
-		Locator.getInstance().getExternalListenersContainer().removeExternalListener(getIntentListenerClass());
+		Locator.getInstance().getCalculator().removeCalculatorEventListener(this);
 	}
 
 	@Override
@@ -131,20 +122,6 @@ public class CalculatorOnscreenService extends Service implements ExternalCalcul
 		super.onDestroy();
 	}
 
-	@Override
-	public void updateState(@Nonnull Context context, @Nonnull CalculatorEditorViewState editorState, @Nonnull CalculatorDisplayViewState displayState) {
-		view.updateDisplayState(displayState);
-		view.updateEditorState(editorState);
-	}
-
-	@Nonnull
-	private static String getCursorColor(@Nonnull Context context) {
-		if (cursorColor == null) {
-			cursorColor = Integer.toHexString(context.getResources().getColor(R.color.cpp_onscreen_cursor_color)).substring(2);
-		}
-		return cursorColor;
-	}
-
 	@Override
 	public void onStart(Intent intent, int startId) {
 		super.onStart(intent, startId);
@@ -182,16 +159,11 @@ public class CalculatorOnscreenService extends Service implements ExternalCalcul
 					showNotification();
 				}
 			}
-
-			if (viewCreated) {
-				intentHandler.onIntent(this, intent);
-			}
-
 		}
 	}
 
 	private boolean isInitIntent(@Nonnull Intent intent) {
-		return intent.getAction().equals(AndroidExternalListenersContainer.INIT_ACTION);
+		return intent.getAction().equals(INIT_ACTION);
 	}
 
 	private void hideNotification() {
@@ -225,7 +197,7 @@ public class CalculatorOnscreenService extends Service implements ExternalCalcul
 	}
 
 	public static void showNotification(@Nonnull Context context) {
-		final Intent intent = new Intent(AndroidExternalListenersContainer.INIT_ACTION);
+		final Intent intent = new Intent(INIT_ACTION);
 		intent.setClass(context, getIntentListenerClass());
 		context.sendBroadcast(intent);
 	}
@@ -237,10 +209,23 @@ public class CalculatorOnscreenService extends Service implements ExternalCalcul
 
 	@Nonnull
 	private static Intent createShowOnscreenViewIntent(@Nonnull Context context) {
-		final Intent intent = new Intent(AndroidExternalListenersContainer.INIT_ACTION);
+		final Intent intent = new Intent(INIT_ACTION);
 		intent.setClass(context, getIntentListenerClass());
 		intent.putExtra(AndroidExternalListenersContainer.INIT_ACTION_CREATE_VIEW_EXTRA, true);
 		return intent;
 	}
+
+	@Override
+	public void onCalculatorEvent(@Nonnull CalculatorEventData calculatorEventData, @Nonnull CalculatorEventType calculatorEventType, @Nullable Object data) {
+		switch (calculatorEventType) {
+			case editor_state_changed:
+			case editor_state_changed_light:
+				view.updateEditorState(((CalculatorEditorChangeEventData) data).getNewValue());
+				break;
+			case display_state_changed:
+				view.updateDisplayState(((CalculatorDisplayChangeEventData) data).getNewValue());
+				break;
+		}
+	}
 }
 
diff --git a/android-app-onscreen/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenView.java b/android-app-onscreen/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenView.java
index 04893ec6..b8f91cbd 100644
--- a/android-app-onscreen/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenView.java
+++ b/android-app-onscreen/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenView.java
@@ -33,13 +33,12 @@ import android.view.MotionEvent;
 import android.view.View;
 import android.view.WindowManager;
 import android.widget.ImageView;
+import org.solovyev.android.calculator.*;
+import org.solovyev.android.prefs.Preference;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-import org.solovyev.android.calculator.*;
-import org.solovyev.android.prefs.Preference;
-
 /**
  * User: serso
  * Date: 11/21/12
@@ -95,9 +94,6 @@ public class CalculatorOnscreenView {
 	@Nonnull
 	private CalculatorOnscreenViewState state = CalculatorOnscreenViewState.newDefaultState();
 
-	@Nonnull
-	private String cursorColor;
-
 	@Nullable
 	private OnscreenViewListener viewListener;
 
@@ -133,13 +129,11 @@ public class CalculatorOnscreenView {
 
 	public static CalculatorOnscreenView newInstance(@Nonnull Context context,
 													 @Nonnull CalculatorOnscreenViewState state,
-													 @Nonnull String cursorColor,
 													 @Nullable OnscreenViewListener viewListener) {
 		final CalculatorOnscreenView result = new CalculatorOnscreenView();
 
 		result.root = View.inflate(context, R.layout.onscreen_layout, null);
 		result.context = context;
-		result.cursorColor = cursorColor;
 		result.viewListener = viewListener;
 
 		final CalculatorOnscreenViewState persistedState = readState(context);
@@ -222,7 +216,7 @@ public class CalculatorOnscreenView {
 			displayView.init(this.context, false);
 
 			editorView = (AndroidCalculatorEditorView) root.findViewById(R.id.calculator_editor);
-			editorView.init(this.context);
+			editorView.init();
 
 			final View onscreenFoldButton = root.findViewById(R.id.onscreen_fold_button);
 			onscreenFoldButton.setOnClickListener(new View.OnClickListener() {
diff --git a/android-app-widget/src/main/java/org/solovyev/android/calculator/widget/AbstractCalculatorWidgetProvider.java b/android-app-widget/src/main/java/org/solovyev/android/calculator/widget/AbstractCalculatorWidgetProvider.java
index feabad84..ed976459 100644
--- a/android-app-widget/src/main/java/org/solovyev/android/calculator/widget/AbstractCalculatorWidgetProvider.java
+++ b/android-app-widget/src/main/java/org/solovyev/android/calculator/widget/AbstractCalculatorWidgetProvider.java
@@ -173,13 +173,13 @@ abstract class AbstractCalculatorWidgetProvider extends AppWidgetProvider implem
 	}
 
 	private void updateEditorState(@Nonnull Context context, @Nonnull RemoteViews views, @Nonnull CalculatorEditorViewState editorState) {
-		String text = editorState.getText();
+		final CharSequence text = editorState.getTextAsCharSequence();
 
 		CharSequence newText = text;
 		int selection = editorState.getSelection();
 		if (selection >= 0 && selection <= text.length()) {
 			// inject cursor
-			newText = Html.fromHtml(text.substring(0, selection) + "<font color=\"#" + getCursorColor(context) + "\">|</font>" + text.substring(selection));
+			newText = Html.fromHtml(text.subSequence(0, selection) + "<font color=\"#" + getCursorColor(context) + "\">|</font>" + text.subSequence(selection, text.length()));
 		}
 		Locator.getInstance().getNotifier().showDebugMessage(TAG, "New editor state: " + text);
 		views.setTextViewText(R.id.calculator_editor, newText);
diff --git a/android-app/src/main/java/org/solovyev/android/calculator/AndroidCalculator.java b/android-app/src/main/java/org/solovyev/android/calculator/AndroidCalculator.java
index b8185e1a..2aee1f2c 100644
--- a/android-app/src/main/java/org/solovyev/android/calculator/AndroidCalculator.java
+++ b/android-app/src/main/java/org/solovyev/android/calculator/AndroidCalculator.java
@@ -29,15 +29,13 @@ import android.content.SharedPreferences;
 import android.preference.PreferenceManager;
 import jscl.NumeralBase;
 import jscl.math.Generic;
-
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
-
 import org.solovyev.android.calculator.history.CalculatorHistoryState;
 import org.solovyev.android.calculator.jscl.JsclOperation;
 import org.solovyev.common.history.HistoryAction;
 import org.solovyev.common.msg.Message;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
 import java.util.List;
 
 /**
@@ -81,7 +79,7 @@ public class AndroidCalculator implements Calculator, CalculatorEventListener, S
 	}
 
 	public void setEditor(@Nonnull Context context, @Nonnull AndroidCalculatorEditorView editorView) {
-		editorView.init(context);
+		editorView.init();
 		Locator.getInstance().getEditor().setView(editorView);
 	}
 
diff --git a/android-app/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java b/android-app/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java
index 5f53b111..3e4f76d3 100644
--- a/android-app/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java
+++ b/android-app/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java
@@ -31,13 +31,9 @@ import android.util.Log;
 import net.robotmedia.billing.BillingController;
 import net.robotmedia.billing.helper.DefaultBillingObserver;
 import net.robotmedia.billing.model.BillingDB;
-
 import org.acra.ACRA;
 import org.acra.ReportingInteractionMode;
 import org.acra.annotation.ReportsCrashes;
-
-import javax.annotation.Nonnull;
-
 import org.solovyev.android.Android;
 import org.solovyev.android.App;
 import org.solovyev.android.ServiceLocator;
@@ -48,8 +44,10 @@ import org.solovyev.android.calculator.model.AndroidCalculatorEngine;
 import org.solovyev.android.calculator.onscreen.CalculatorOnscreenStartActivity;
 import org.solovyev.android.calculator.plot.AndroidCalculatorPlotter;
 import org.solovyev.android.calculator.plot.CalculatorPlotterImpl;
+import org.solovyev.android.calculator.view.EditorTextProcessor;
 import org.solovyev.common.msg.MessageType;
 
+import javax.annotation.Nonnull;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -137,6 +135,8 @@ public class CalculatorApplication extends android.app.Application implements Sh
 
 		final AndroidCalculator calculator = new AndroidCalculator(this);
 
+		final EditorTextProcessor editorTextProcessor = new EditorTextProcessor();
+
 		Locator.getInstance().init(calculator,
 				new AndroidCalculatorEngine(this),
 				new AndroidCalculatorClipboard(this),
@@ -146,7 +146,10 @@ public class CalculatorApplication extends android.app.Application implements Sh
 				new AndroidCalculatorPreferenceService(this),
 				new AndroidCalculatorKeyboard(this, new CalculatorKeyboardImpl(calculator)),
 				new AndroidExternalListenersContainer(calculator),
-				new AndroidCalculatorPlotter(this, new CalculatorPlotterImpl(calculator)));
+				new AndroidCalculatorPlotter(this, new CalculatorPlotterImpl(calculator)),
+				editorTextProcessor);
+
+		editorTextProcessor.init(this);
 
 		listeners.add(new CalculatorActivityLauncher());
 		for (CalculatorEventListener listener : listeners) {
diff --git a/android-app/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java b/android-app/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java
index b9e7d9fd..f30f66c0 100644
--- a/android-app/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java
+++ b/android-app/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java
@@ -41,7 +41,7 @@ import javax.annotation.Nullable;
 public class CalculatorTestUtils {
 
 	public static void staticSetUp(@Nullable Context context) throws Exception {
-		Locator.getInstance().init(new CalculatorImpl(), newCalculatorEngine(), Mockito.mock(CalculatorClipboard.class), Mockito.mock(CalculatorNotifier.class), Mockito.mock(CalculatorHistory.class), new SystemOutCalculatorLogger(), Mockito.mock(CalculatorPreferenceService.class), Mockito.mock(CalculatorKeyboard.class), Mockito.mock(CalculatorExternalListenersContainer.class), Mockito.mock(CalculatorPlotter.class));
+		Locator.getInstance().init(new CalculatorImpl(), newCalculatorEngine(), Mockito.mock(CalculatorClipboard.class), Mockito.mock(CalculatorNotifier.class), Mockito.mock(CalculatorHistory.class), new SystemOutCalculatorLogger(), Mockito.mock(CalculatorPreferenceService.class), Mockito.mock(CalculatorKeyboard.class), Mockito.mock(CalculatorExternalListenersContainer.class), Mockito.mock(CalculatorPlotter.class), null);
 		Locator.getInstance().getEngine().init();
 
 		if (context != null) {
@@ -51,7 +51,7 @@ public class CalculatorTestUtils {
 
 	public static void initViews(@Nonnull Context context) {
 		final AndroidCalculatorEditorView editor = new AndroidCalculatorEditorView(context);
-		editor.init(context);
+		editor.init();
 		Locator.getInstance().getEditor().setView(editor);
 
 		final AndroidCalculatorDisplayView display = new AndroidCalculatorDisplayView(context);
diff --git a/core/src/main/java/org/solovyev/android/calculator/CalculatorEditor.java b/core/src/main/java/org/solovyev/android/calculator/CalculatorEditor.java
index 477e1783..ca66d2e9 100644
--- a/core/src/main/java/org/solovyev/android/calculator/CalculatorEditor.java
+++ b/core/src/main/java/org/solovyev/android/calculator/CalculatorEditor.java
@@ -22,11 +22,11 @@
 
 package org.solovyev.android.calculator;
 
+import org.solovyev.common.gui.CursorControl;
+
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-import org.solovyev.common.gui.CursorControl;
-
 /**
  * User: Solovyev_S
  * Date: 21.09.12
@@ -34,6 +34,9 @@ import org.solovyev.common.gui.CursorControl;
  */
 public interface CalculatorEditor extends CalculatorEventListener {
 
+	@Nonnull
+	String TAG = CalculatorEditor.class.getSimpleName();
+
 	void setView(@Nullable CalculatorEditorView view);
 
 	@Nonnull
diff --git a/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorChangeEventData.java b/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorChangeEventData.java
index 3cd90c21..6ad39aad 100644
--- a/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorChangeEventData.java
+++ b/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorChangeEventData.java
@@ -22,10 +22,41 @@
 
 package org.solovyev.android.calculator;
 
+import javax.annotation.Nonnull;
+
 /**
  * User: Solovyev_S
  * Date: 21.09.12
  * Time: 13:46
  */
-public interface CalculatorEditorChangeEventData extends Change<CalculatorEditorViewState> {
+public final class CalculatorEditorChangeEventData implements Change<CalculatorEditorViewState> {
+
+	@Nonnull
+	private CalculatorEditorViewState oldState;
+
+	@Nonnull
+	private CalculatorEditorViewState newState;
+
+	private CalculatorEditorChangeEventData(@Nonnull CalculatorEditorViewState oldState,
+											@Nonnull CalculatorEditorViewState newState) {
+		this.oldState = oldState;
+		this.newState = newState;
+	}
+
+	public static CalculatorEditorChangeEventData newChangeEventData(@Nonnull CalculatorEditorViewState oldState,
+																	 @Nonnull CalculatorEditorViewState newState) {
+		return new CalculatorEditorChangeEventData(oldState, newState);
+	}
+
+	@Nonnull
+	@Override
+	public CalculatorEditorViewState getOldValue() {
+		return this.oldState;
+	}
+
+	@Nonnull
+	@Override
+	public CalculatorEditorViewState getNewValue() {
+		return this.newState;
+	}
 }
diff --git a/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorChangeEventDataImpl.java b/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorChangeEventDataImpl.java
deleted file mode 100644
index 9786155f..00000000
--- a/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorChangeEventDataImpl.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Copyright 2013 serso aka se.solovyev
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- * Contact details
- *
- * Email: se.solovyev@gmail.com
- * Site:  http://se.solovyev.org
- */
-
-package org.solovyev.android.calculator;
-
-import javax.annotation.Nonnull;
-
-/**
- * User: Solovyev_S
- * Date: 21.09.12
- * Time: 13:46
- */
-public class CalculatorEditorChangeEventDataImpl implements CalculatorEditorChangeEventData {
-
-	@Nonnull
-	private CalculatorEditorViewState oldState;
-
-	@Nonnull
-	private CalculatorEditorViewState newState;
-
-	public CalculatorEditorChangeEventDataImpl(@Nonnull CalculatorEditorViewState oldState,
-											   @Nonnull CalculatorEditorViewState newState) {
-		this.oldState = oldState;
-		this.newState = newState;
-	}
-
-	@Nonnull
-	@Override
-	public CalculatorEditorViewState getOldValue() {
-		return this.oldState;
-	}
-
-	@Nonnull
-	@Override
-	public CalculatorEditorViewState getNewValue() {
-		return this.newState;
-	}
-}
diff --git a/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorImpl.java b/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorImpl.java
index 6c563ba7..4004cf17 100644
--- a/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorImpl.java
+++ b/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorImpl.java
@@ -22,13 +22,19 @@
 
 package org.solovyev.android.calculator;
 
+import org.solovyev.android.calculator.history.CalculatorHistoryState;
+import org.solovyev.android.calculator.history.EditorHistoryState;
+import org.solovyev.android.calculator.text.TextProcessor;
+import org.solovyev.android.calculator.text.TextProcessorEditorResult;
+import org.solovyev.common.gui.CursorControl;
+import org.solovyev.common.text.Strings;
+
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-import org.solovyev.android.calculator.history.CalculatorHistoryState;
-import org.solovyev.android.calculator.history.EditorHistoryState;
-import org.solovyev.common.gui.CursorControl;
-import org.solovyev.common.text.Strings;
+import static org.solovyev.android.calculator.CalculatorEditorChangeEventData.newChangeEventData;
+import static org.solovyev.android.calculator.CalculatorEventType.editor_state_changed;
+import static org.solovyev.android.calculator.CalculatorEventType.editor_state_changed_light;
 
 /**
  * User: Solovyev_S
@@ -55,8 +61,12 @@ public class CalculatorEditorImpl implements CalculatorEditor {
 	@Nonnull
 	private final CursorControlAdapter cursorControlAdapter = new CursorControlAdapter(this);
 
-	public CalculatorEditorImpl(@Nonnull Calculator calculator) {
+	@Nullable
+	private final TextProcessor<TextProcessorEditorResult, String> textProcessor;
+
+	public CalculatorEditorImpl(@Nonnull Calculator calculator, @Nullable TextProcessor<TextProcessorEditorResult, String> textProcessor) {
 		this.calculator = calculator;
+		this.textProcessor = textProcessor;
 		this.calculator.addCalculatorEventListener(this);
 		this.lastEventHolder = new CalculatorEventHolder(CalculatorUtils.createFirstEventDataId());
 	}
@@ -89,6 +99,14 @@ public class CalculatorEditorImpl implements CalculatorEditor {
 	}
 
 	private void setViewState(@Nonnull CalculatorEditorViewState newViewState, boolean majorChanges) {
+		if (textProcessor != null) {
+			try {
+				final TextProcessorEditorResult result = textProcessor.process(newViewState.getText());
+				newViewState = CalculatorEditorViewStateImpl.newInstance(result.getCharSequence(), newViewState.getSelection() + result.getOffset());
+			} catch (CalculatorParseException e) {
+				Locator.getInstance().getLogger().error(TAG, e.getMessage(), e);
+			}
+		}
 		synchronized (viewLock) {
 			final CalculatorEditorViewState oldViewState = this.lastViewState;
 
@@ -97,11 +115,17 @@ public class CalculatorEditorImpl implements CalculatorEditor {
 				this.view.setState(newViewState);
 			}
 
-			if (majorChanges) {
-				calculator.fireCalculatorEvent(CalculatorEventType.editor_state_changed, new CalculatorEditorChangeEventDataImpl(oldViewState, newViewState));
-			} else {
-				calculator.fireCalculatorEvent(CalculatorEventType.editor_state_changed_light, new CalculatorEditorChangeEventDataImpl(oldViewState, newViewState));
-			}
+			fireStateChangedEvent(majorChanges, oldViewState, newViewState);
+		}
+	}
+
+	private void fireStateChangedEvent(boolean majorChanges, @Nonnull CalculatorEditorViewState oldViewState, @Nonnull CalculatorEditorViewState newViewState) {
+		assert Thread.holdsLock(viewLock);
+
+		if (majorChanges) {
+			calculator.fireCalculatorEvent(editor_state_changed, newChangeEventData(oldViewState, newViewState));
+		} else {
+			calculator.fireCalculatorEvent(editor_state_changed_light, newChangeEventData(oldViewState, newViewState));
 		}
 	}
 
diff --git a/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorViewState.java b/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorViewState.java
index fe9295ef..3bed5c8e 100644
--- a/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorViewState.java
+++ b/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorViewState.java
@@ -36,5 +36,8 @@ public interface CalculatorEditorViewState extends Serializable {
 	@Nonnull
 	String getText();
 
+	@Nonnull
+	CharSequence getTextAsCharSequence();
+
 	int getSelection();
 }
diff --git a/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorViewStateImpl.java b/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorViewStateImpl.java
index ec6c328f..d04d25ef 100644
--- a/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorViewStateImpl.java
+++ b/core/src/main/java/org/solovyev/android/calculator/CalculatorEditorViewStateImpl.java
@@ -32,7 +32,7 @@ import javax.annotation.Nonnull;
 public class CalculatorEditorViewStateImpl implements CalculatorEditorViewState {
 
 	@Nonnull
-	private String text = "";
+	private CharSequence text = "";
 
 	private int selection = 0;
 
@@ -47,6 +47,12 @@ public class CalculatorEditorViewStateImpl implements CalculatorEditorViewState
 	@Nonnull
 	@Override
 	public String getText() {
+		return this.text.toString();
+	}
+
+	@Nonnull
+	@Override
+	public CharSequence getTextAsCharSequence() {
 		return this.text;
 	}
 
@@ -70,7 +76,7 @@ public class CalculatorEditorViewStateImpl implements CalculatorEditorViewState
 	}
 
 	@Nonnull
-	public static CalculatorEditorViewState newInstance(@Nonnull String text, int selection) {
+	public static CalculatorEditorViewState newInstance(@Nonnull CharSequence text, int selection) {
 		final CalculatorEditorViewStateImpl result = new CalculatorEditorViewStateImpl();
 		result.text = text;
 		result.selection = selection;
diff --git a/core/src/main/java/org/solovyev/android/calculator/CalculatorLocator.java b/core/src/main/java/org/solovyev/android/calculator/CalculatorLocator.java
index 19a18282..2c266fc6 100644
--- a/core/src/main/java/org/solovyev/android/calculator/CalculatorLocator.java
+++ b/core/src/main/java/org/solovyev/android/calculator/CalculatorLocator.java
@@ -22,11 +22,14 @@
 
 package org.solovyev.android.calculator;
 
-import javax.annotation.Nonnull;
-
 import org.solovyev.android.calculator.external.CalculatorExternalListenersContainer;
 import org.solovyev.android.calculator.history.CalculatorHistory;
 import org.solovyev.android.calculator.plot.CalculatorPlotter;
+import org.solovyev.android.calculator.text.TextProcessor;
+import org.solovyev.android.calculator.text.TextProcessorEditorResult;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
 
 /**
  * User: Solovyev_S
@@ -44,7 +47,8 @@ public interface CalculatorLocator {
 			  @Nonnull CalculatorPreferenceService preferenceService,
 			  @Nonnull CalculatorKeyboard keyboard,
 			  @Nonnull CalculatorExternalListenersContainer externalListenersContainer,
-			  @Nonnull CalculatorPlotter plotter);
+			  @Nonnull CalculatorPlotter plotter,
+			  @Nullable TextProcessor<TextProcessorEditorResult, String> editorTextProcessor);
 
 	@Nonnull
 	Calculator getCalculator();
diff --git a/core/src/main/java/org/solovyev/android/calculator/Locator.java b/core/src/main/java/org/solovyev/android/calculator/Locator.java
index 75fb1d2d..f995122f 100644
--- a/core/src/main/java/org/solovyev/android/calculator/Locator.java
+++ b/core/src/main/java/org/solovyev/android/calculator/Locator.java
@@ -25,8 +25,11 @@ package org.solovyev.android.calculator;
 import org.solovyev.android.calculator.external.CalculatorExternalListenersContainer;
 import org.solovyev.android.calculator.history.CalculatorHistory;
 import org.solovyev.android.calculator.plot.CalculatorPlotter;
+import org.solovyev.android.calculator.text.TextProcessor;
+import org.solovyev.android.calculator.text.TextProcessorEditorResult;
 
 import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
 
 /**
  * User: Solovyev_S
@@ -87,7 +90,8 @@ public class Locator implements CalculatorLocator {
 					 @Nonnull CalculatorPreferenceService preferenceService,
 					 @Nonnull CalculatorKeyboard keyboard,
 					 @Nonnull CalculatorExternalListenersContainer externalListenersContainer,
-					 @Nonnull CalculatorPlotter plotter) {
+					 @Nonnull CalculatorPlotter plotter,
+					 @Nullable TextProcessor<TextProcessorEditorResult, String> editorTextProcessor) {
 
 		this.calculator = calculator;
 		this.calculatorEngine = engine;
@@ -99,7 +103,7 @@ public class Locator implements CalculatorLocator {
 		this.calculatorExternalListenersContainer = externalListenersContainer;
 		this.calculatorPlotter = plotter;
 
-		calculatorEditor = new CalculatorEditorImpl(this.calculator);
+		calculatorEditor = new CalculatorEditorImpl(this.calculator, editorTextProcessor);
 		calculatorDisplay = new CalculatorDisplayImpl(this.calculator);
 		calculatorKeyboard = keyboard;
 	}
diff --git a/core/src/main/java/org/solovyev/android/calculator/text/TextProcessorEditorResult.java b/core/src/main/java/org/solovyev/android/calculator/text/TextProcessorEditorResult.java
new file mode 100644
index 00000000..e8bf1e65
--- /dev/null
+++ b/core/src/main/java/org/solovyev/android/calculator/text/TextProcessorEditorResult.java
@@ -0,0 +1,58 @@
+package org.solovyev.android.calculator.text;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+/**
+* User: serso
+* Date: 6/27/13
+* Time: 8:07 PM
+*/
+public final class TextProcessorEditorResult implements CharSequence {
+
+	@Nonnull
+	private final CharSequence charSequence;
+
+	@Nullable
+	private String string;
+
+	private final int offset;
+
+	public TextProcessorEditorResult(@Nonnull CharSequence charSequence, int offset) {
+		this.charSequence = charSequence;
+		this.offset = offset;
+	}
+
+	@Override
+	public int length() {
+		return charSequence.length();
+	}
+
+	@Override
+	public char charAt(int i) {
+		return charSequence.charAt(i);
+	}
+
+	@Override
+	public CharSequence subSequence(int i, int i1) {
+		return charSequence.subSequence(i, i1);
+	}
+
+	@Nonnull
+	@Override
+	public String toString() {
+		if (string == null) {
+			string = charSequence.toString();
+		}
+		return string;
+	}
+
+	@Nonnull
+	public CharSequence getCharSequence() {
+		return charSequence;
+	}
+
+	public int getOffset() {
+		return offset;
+	}
+}
diff --git a/core/src/test/java/org/solovyev/android/calculator/AbstractCalculatorTest.java b/core/src/test/java/org/solovyev/android/calculator/AbstractCalculatorTest.java
index 6dc1777b..ce1575dd 100644
--- a/core/src/test/java/org/solovyev/android/calculator/AbstractCalculatorTest.java
+++ b/core/src/test/java/org/solovyev/android/calculator/AbstractCalculatorTest.java
@@ -35,7 +35,7 @@ import org.solovyev.android.calculator.plot.CalculatorPlotter;
 public class AbstractCalculatorTest {
 
 	protected void setUp() throws Exception {
-		Locator.getInstance().init(new CalculatorImpl(), CalculatorTestUtils.newCalculatorEngine(), Mockito.mock(CalculatorClipboard.class), Mockito.mock(CalculatorNotifier.class), Mockito.mock(CalculatorHistory.class), new SystemOutCalculatorLogger(), Mockito.mock(CalculatorPreferenceService.class), Mockito.mock(CalculatorKeyboard.class), Mockito.mock(CalculatorExternalListenersContainer.class), Mockito.mock(CalculatorPlotter.class));
+		Locator.getInstance().init(new CalculatorImpl(), CalculatorTestUtils.newCalculatorEngine(), Mockito.mock(CalculatorClipboard.class), Mockito.mock(CalculatorNotifier.class), Mockito.mock(CalculatorHistory.class), new SystemOutCalculatorLogger(), Mockito.mock(CalculatorPreferenceService.class), Mockito.mock(CalculatorKeyboard.class), Mockito.mock(CalculatorExternalListenersContainer.class), Mockito.mock(CalculatorPlotter.class), null);
 		Locator.getInstance().getEngine().init();
 	}
 
diff --git a/core/src/test/java/org/solovyev/android/calculator/CalculatorEditorImplTest.java b/core/src/test/java/org/solovyev/android/calculator/CalculatorEditorImplTest.java
index 71d2a563..88ee5dc8 100644
--- a/core/src/test/java/org/solovyev/android/calculator/CalculatorEditorImplTest.java
+++ b/core/src/test/java/org/solovyev/android/calculator/CalculatorEditorImplTest.java
@@ -22,12 +22,12 @@
 
 package org.solovyev.android.calculator;
 
-import javax.annotation.Nonnull;
-
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 
+import javax.annotation.Nonnull;
+
 /**
  * User: Solovyev_S
  * Date: 21.09.12
@@ -41,7 +41,7 @@ public class CalculatorEditorImplTest extends AbstractCalculatorTest {
 	@Before
 	public void setUp() throws Exception {
 		super.setUp();
-		this.calculatorEditor = new CalculatorEditorImpl(Locator.getInstance().getCalculator());
+		this.calculatorEditor = new CalculatorEditorImpl(Locator.getInstance().getCalculator(), null);
 	}
 
 	@Test
diff --git a/core/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java b/core/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java
index f33d27a5..18208619 100644
--- a/core/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java
+++ b/core/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java
@@ -49,7 +49,7 @@ public class CalculatorTestUtils {
 	public static final int TIMEOUT = 15;
 
 	public static void staticSetUp() throws Exception {
-		Locator.getInstance().init(new CalculatorImpl(), newCalculatorEngine(), Mockito.mock(CalculatorClipboard.class), Mockito.mock(CalculatorNotifier.class), Mockito.mock(CalculatorHistory.class), new SystemOutCalculatorLogger(), Mockito.mock(CalculatorPreferenceService.class), Mockito.mock(CalculatorKeyboard.class), Mockito.mock(CalculatorExternalListenersContainer.class), Mockito.mock(CalculatorPlotter.class));
+		Locator.getInstance().init(new CalculatorImpl(), newCalculatorEngine(), Mockito.mock(CalculatorClipboard.class), Mockito.mock(CalculatorNotifier.class), Mockito.mock(CalculatorHistory.class), new SystemOutCalculatorLogger(), Mockito.mock(CalculatorPreferenceService.class), Mockito.mock(CalculatorKeyboard.class), Mockito.mock(CalculatorExternalListenersContainer.class), Mockito.mock(CalculatorPlotter.class), null);
 		Locator.getInstance().getEngine().init();
 	}