ScriptingLayerForAndroid/src/com/googlecode/android_scripting/activity/ScriptEditor.java - platform/packages/apps/Test/connectivity - Git at Google

 /*
  * Copyright (C) 2009 Google Inc.
  *
  * 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.savedInstanceState See the License for the specific language
  * governing permissions and limitations under the License.
  */

 package com.googlecode.android_scripting.activity;

 import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.DialogInterface;
 import android.content.DialogInterface.OnClickListener;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.SharedPreferences.Editor;
 import android.media.AudioManager;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
 import android.text.Editable;
 import android.text.InputFilter;
 import android.text.InputType;
 import android.text.Selection;
 import android.text.Spanned;
 import android.text.TextWatcher;
 import android.text.style.UnderlineSpan;
 import android.view.KeyEvent;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.CheckBox;
 import android.widget.EditText;
 import android.widget.Toast;

 import com.googlecode.android_scripting.Analytics;
 import com.googlecode.android_scripting.BaseApplication;
 import com.googlecode.android_scripting.Constants;
 import com.googlecode.android_scripting.FileUtils;
 import com.googlecode.android_scripting.Log;
 import com.googlecode.android_scripting.R;
 import com.googlecode.android_scripting.ScriptStorageAdapter;
 import com.googlecode.android_scripting.dialog.Help;
 import com.googlecode.android_scripting.interpreter.Interpreter;
 import com.googlecode.android_scripting.interpreter.InterpreterConfiguration;

 import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Vector;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;

 /**
  * A text editor for scripts.
  *
  * @author Damon Kohler (damonkohler@gmail.com)
  */
 public class ScriptEditor extends Activity implements OnClickListener {
   private static final int DIALOG_FIND_REPLACE = 2;
   private static final int DIALOG_LINE = 1;
   private EditText mNameText;
   private EditText mContentText;
   private boolean mScheduleMoveLeft;
   private String mLastSavedContent;
   private SharedPreferences mPreferences;
   private InterpreterConfiguration mConfiguration;
   private ContentTextWatcher mWatcher;
   private EditHistory mHistory;
   private File mScript;
   private EditText mLineNo;

   private boolean mIsUndoOrRedo = false;
   private boolean mEnableAutoClose;
   private boolean mAutoIndent;

   private EditText mSearchFind;
   private EditText mSearchReplace;
   private CheckBox mSearchCase;
   private CheckBox mSearchWord;
   private CheckBox mSearchAll;
   private CheckBox mSearchStart;

   private static enum MenuId {
     SAVE, SAVE_AND_RUN, PREFERENCES, API_BROWSER, HELP, SHARE, GOTO, SEARCH;
     public int getId() {
       return ordinal() + Menu.FIRST;
     }
   }

   private static enum RequestCode {
     RPC_HELP
   }

   private int readIntPref(String key, int defaultValue, int maxValue) {
     int val;
     try {
       val = Integer.parseInt(mPreferences.getString(key, Integer.toString(defaultValue)));
     } catch (NumberFormatException e) {
       val = defaultValue;
     }
     val = Math.max(0, Math.min(val, maxValue));
     return val;
   }

   @Override
   protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.script_editor);
     mNameText = (EditText) findViewById(R.id.script_editor_title);
     mContentText = (EditText) findViewById(R.id.script_editor_body);
     mHistory = new EditHistory();
     mWatcher = new ContentTextWatcher(mHistory);
     mPreferences = PreferenceManager.getDefaultSharedPreferences(this);
     updatePreferences();

     mScript = new File(getIntent().getStringExtra(Constants.EXTRA_SCRIPT_PATH));
     mNameText.setText(mScript.getName());
     mNameText.setSelected(true);
     // NOTE: This appears to be the only way to get Android to put the cursor to the beginning of
     // the EditText field.
     mNameText.setSelection(1);
     mNameText.extendSelection(0);
     mNameText.setSelection(0);
     mLastSavedContent = getIntent().getStringExtra(Constants.EXTRA_SCRIPT_CONTENT);
     if (mLastSavedContent == null) {
       try {
         mLastSavedContent = FileUtils.readToString(mScript);
       } catch (IOException e) {
         Log.e("Failed to read script.", e);
         mLastSavedContent = "";
       } finally {
       }
     }

     mContentText.setText(mLastSavedContent);
     InputFilter[] oldFilters = mContentText.getFilters();
     List<InputFilter> filters = new ArrayList<InputFilter>(oldFilters.length + 1);
     filters.addAll(Arrays.asList(oldFilters));
     filters.add(new ContentInputFilter());
     mContentText.setFilters(filters.toArray(oldFilters));
     mContentText.addTextChangedListener(mWatcher);
     mConfiguration = ((BaseApplication) getApplication()).getInterpreterConfiguration();
     // Disables volume key beep.
     setVolumeControlStream(AudioManager.STREAM_MUSIC);
     mLineNo = new EditText(this);
     mLineNo.setInputType(InputType.TYPE_CLASS_NUMBER);
     int lastLocation = mPreferences.getInt("lasteditpos." + mScript, -1);
     if (lastLocation >= 0) {
       mContentText.requestFocus();
       mContentText.setSelection(lastLocation);
     }
     Analytics.trackActivity(this);
   }

   @Override
   protected void onResume() {
     super.onResume();
     updatePreferences();
   }

   private void updatePreferences() {
     mContentText.setTextSize(readIntPref("editor_fontsize", 10, 30));
     mEnableAutoClose = mPreferences.getBoolean("enableAutoClose", true);
     mAutoIndent = mPreferences.getBoolean("editor_auto_indent", false);
     mContentText.setHorizontallyScrolling(mPreferences.getBoolean("editor_no_wrap", false));
   }

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
     super.onCreateOptionsMenu(menu);
     menu.add(0, MenuId.SAVE.getId(), 0, "Save & Exit").setIcon(android.R.drawable.ic_menu_save);
     menu.add(0, MenuId.SAVE_AND_RUN.getId(), 0, "Save & Run").setIcon(
         android.R.drawable.ic_media_play);
     menu.add(0, MenuId.PREFERENCES.getId(), 0, "Preferences").setIcon(
         android.R.drawable.ic_menu_preferences);
     menu.add(0, MenuId.API_BROWSER.getId(), 0, "API Browser").setIcon(
         android.R.drawable.ic_menu_info_details);
     menu.add(0, MenuId.HELP.getId(), 0, "Help").setIcon(android.R.drawable.ic_menu_help);
     menu.add(0, MenuId.SHARE.getId(), 0, "Share").setIcon(android.R.drawable.ic_menu_share);
     menu.add(0, MenuId.GOTO.getId(), 0, "GoTo").setIcon(android.R.drawable.ic_menu_directions);
     menu.add(0, MenuId.SEARCH.getId(), 0, "Find").setIcon(android.R.drawable.ic_menu_search);
     return true;
   }

   @Override
   public boolean onOptionsItemSelected(MenuItem item) {
     if (item.getItemId() == MenuId.SAVE.getId()) {
       save();
       finish();
     } else if (item.getItemId() == MenuId.SAVE_AND_RUN.getId()) {
       save();
       Interpreter interpreter =
           mConfiguration.getInterpreterForScript(mNameText.getText().toString());
       if (interpreter != null) { // We may be editing an unknown type.
         Intent intent = new Intent(this, ScriptingLayerService.class);
         intent.setAction(Constants.ACTION_LAUNCH_FOREGROUND_SCRIPT);
         intent.putExtra(Constants.EXTRA_SCRIPT_PATH, mScript.getAbsolutePath());
         startService(intent);
       } else {
         // TODO(damonkohler): Should remove menu option.
         Toast.makeText(this, "Can't run this type.", Toast.LENGTH_SHORT).show();
       }
       finish();
     } else if (item.getItemId() == MenuId.PREFERENCES.getId()) {
       startActivity(new Intent(this, Preferences.class));
     } else if (item.getItemId() == MenuId.API_BROWSER.getId()) {
       Intent intent = new Intent(this, ApiBrowser.class);
       intent.putExtra(Constants.EXTRA_SCRIPT_PATH, mNameText.getText().toString());
       intent.putExtra(Constants.EXTRA_INTERPRETER_NAME,
           mConfiguration.getInterpreterForScript(mNameText.getText().toString()).getName());
       intent.putExtra(Constants.EXTRA_SCRIPT_TEXT, mContentText.getText().toString());
       startActivityForResult(intent, RequestCode.RPC_HELP.ordinal());
     } else if (item.getItemId() == MenuId.HELP.getId()) {
       Help.show(this);
     } else if (item.getItemId() == MenuId.SHARE.getId()) {
       Intent intent = new Intent(Intent.ACTION_SEND);
       intent.putExtra(Intent.EXTRA_TEXT, mContentText.getText().toString());
       intent.putExtra(Intent.EXTRA_SUBJECT, "Share " + mNameText.getText().toString());
       intent.setType("text/plain");
       startActivity(Intent.createChooser(intent, "Send Script to:"));
     } else if (item.getItemId() == MenuId.GOTO.getId()) {
       showDialog(DIALOG_LINE);
     } else if (item.getItemId() == MenuId.SEARCH.getId()) {
       showDialog(DIALOG_FIND_REPLACE);
     }
     return super.onOptionsItemSelected(item);
   }

   @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     super.onActivityResult(requestCode, resultCode, data);
     RequestCode request = RequestCode.values()[requestCode];

     if (resultCode == RESULT_OK) {
       switch (request) {
       case RPC_HELP:
         String rpcText = data.getStringExtra(Constants.EXTRA_RPC_HELP_TEXT);
         insertContent(rpcText);
         break;
       default:
         break;
       }
     } else {
       switch (request) {
       case RPC_HELP:
         break;
       default:
         break;
       }
     }
   }

   private void save() {
     int start = mContentText.getSelectionStart();
     mLastSavedContent = mContentText.getText().toString();
     mScript = new File(mScript.getParent(), mNameText.getText().toString());
     ScriptStorageAdapter.writeScript(mScript, mLastSavedContent);
     Toast.makeText(this, "Saved " + mNameText.getText().toString(), Toast.LENGTH_SHORT).show();
     Editor e = mPreferences.edit();
     e.putInt("lasteditpos." + mScript, start);
     e.commit();
   }

   private void insertContent(String text) {
     int selectionStart = Math.min(mContentText.getSelectionStart(), mContentText.getSelectionEnd());
     int selectionEnd = Math.max(mContentText.getSelectionStart(), mContentText.getSelectionEnd());
     mContentText.getEditableText().replace(selectionStart, selectionEnd, text);
   }

   @Override
   public boolean onKeyDown(int keyCode, KeyEvent event) {
     if (keyCode == KeyEvent.KEYCODE_BACK && hasContentChanged()) {
       AlertDialog.Builder alert = new AlertDialog.Builder(this);
       setVolumeControlStream(AudioManager.STREAM_MUSIC);
       alert.setCancelable(false);
       alert.setTitle("Confirm exit");
       alert.setMessage("Would you like to save?");
       alert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
         public void onClick(DialogInterface dialog, int whichButton) {
           save();
           finish();
         }
       });
       alert.setNegativeButton("No", new DialogInterface.OnClickListener() {
         public void onClick(DialogInterface dialog, int whichButton) {
           finish();
         }
       });
       alert.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
         public void onClick(DialogInterface dialog, int whichButton) {
         }
       });
       alert.show();
       return true;
     } else if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
       redo();
       return true;
     } else if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
       undo();
       return true;
     } else if (keyCode == KeyEvent.KEYCODE_SEARCH) {
       showDialog(DIALOG_FIND_REPLACE);
       return true;
     } else {
       return super.onKeyDown(keyCode, event);
     }
   }

   @Override
   protected Dialog onCreateDialog(int id, Bundle args) {
     AlertDialog.Builder b = new AlertDialog.Builder(this);
     if (id == DIALOG_LINE) {
       b.setTitle("Goto Line");
       b.setView(mLineNo);
       b.setPositiveButton("Ok", new OnClickListener() {

         @Override
         public void onClick(DialogInterface dialog, int which) {
           gotoLine(Integer.parseInt(mLineNo.getText().toString()));
         }
       });
       b.setNegativeButton("Cancel", null);
       return b.create();
     } else if (id == DIALOG_FIND_REPLACE) {
       View v = getLayoutInflater().inflate(R.layout.findreplace, null);
       mSearchFind = (EditText) v.findViewById(R.id.searchFind);
       mSearchReplace = (EditText) v.findViewById(R.id.searchReplace);
       mSearchAll = (CheckBox) v.findViewById(R.id.searchAll);
       mSearchCase = (CheckBox) v.findViewById(R.id.searchCase);
       mSearchStart = (CheckBox) v.findViewById(R.id.searchStart);
       mSearchWord = (CheckBox) v.findViewById(R.id.searchWord);
       b.setTitle("Search and Replace");
       b.setView(v);
       b.setPositiveButton("Find", this);
       b.setNeutralButton("Next", this);
       b.setNegativeButton("Replace", this);
       return b.create();
     }

     return super.onCreateDialog(id, args);
   }

   @Override
   protected void onPrepareDialog(int id, Dialog dialog, Bundle args) {
     if (id == DIALOG_LINE) {
       mLineNo.setText(String.valueOf(getLineNo()));
     } else if (id == DIALOG_FIND_REPLACE) {
       mSearchStart.setChecked(false);
     }
     super.onPrepareDialog(id, dialog, args);
   }

   protected int getLineNo() {
     int pos = mContentText.getSelectionStart();
     String text = mContentText.getText().toString();
     int i = 0;
     int n = 1;
     while (i < pos) {
       int j = text.indexOf("\n", i);
       if (j < 0) {
         break;
       }
       i = j + 1;
       if (i < pos) {
         n += 1;
       }
     }
     return n;
   }

   protected void gotoLine(int line) {
     String text = mContentText.getText().toString();
     if (text.length() < 1) {
       return;
     }
     int i = 0;
     int n = 1;
     while (i < text.length() && n < line) {
       int j = text.indexOf("\n", i);
       if (j < 0) {
         break;
       }
       i = j + 1;
       n += 1;
     }
     mContentText.setSelection(Math.min(text.length() - 1, i));
   }

   @Override
   protected void onUserLeaveHint() {
     if (hasContentChanged()) {
       save();
     }
   }

   private boolean hasContentChanged() {
     return !mLastSavedContent.equals(mContentText.getText().toString());
   }

   private final class ContentInputFilter implements InputFilter {
     @Override
     public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart,
         int dend) {
       if (end - start == 1) {
         Interpreter ip = mConfiguration.getInterpreterForScript(mNameText.getText().toString());
         String auto = null;
         if (ip != null && mEnableAutoClose) {
           auto = ip.getLanguage().autoClose(source.charAt(start));
         }
         // Auto indent code?
         if (auto == null && source.charAt(start) == '\n' && mAutoIndent) {
           int i = dstart - 1;
           int spaces = 0;
           while ((i >= 0) && dest.charAt(i) != '\n') {
             i -= 1; // Find start of line.
           }
           i += 1;
           while (i < dest.length() && dest.charAt(i++) == ' ') {
             spaces += 1;
           }
           if (spaces > 0) {
             return String.format("\n%" + spaces + "s", " ");
           }
         }
         if (auto != null) {
           mScheduleMoveLeft = true;
           return auto;
         }
       }
       return null;
     }
   }

   private final class ContentTextWatcher implements TextWatcher {
     private final EditHistory mmEditHistory;
     private CharSequence mmBeforeChange;
     private CharSequence mmAfterChange;

     private ContentTextWatcher(EditHistory history) {
       mmEditHistory = history;
     }

     @Override
     public void onTextChanged(CharSequence s, int start, int before, int count) {
       if (!mIsUndoOrRedo) {
         mmAfterChange = s.subSequence(start, start + count);
         mmEditHistory.add(new EditItem(start, mmBeforeChange, mmAfterChange));
       }
     }

     @Override
     public void beforeTextChanged(CharSequence s, int start, int count, int after) {
       if (!mIsUndoOrRedo) {
         mmBeforeChange = s.subSequence(start, start + count);
       }
     }

     @Override
     public void afterTextChanged(Editable s) {
       if (mScheduleMoveLeft) {
         mScheduleMoveLeft = false;
         Selection.moveLeft(mContentText.getText(), mContentText.getLayout());
       }
     }
   }

   /**
    * Keeps track of all the edit history of a text.
    */
   private final class EditHistory {
     int mmPosition = 0;
     private final Vector<EditItem> mmHistory = new Vector<EditItem>();

     /**
      * Adds a new edit operation to the history at the current position. If executed after a call to
      * getPrevious() removes all the future history (elements with positions >= current history
      * position).
      *
      */
     private void add(EditItem item) {
       mmHistory.setSize(mmPosition);
       mmHistory.add(item);
       mmPosition++;
     }

     /**
      * Traverses the history backward by one position, returns and item at that position.
      */
     private EditItem getPrevious() {
       if (mmPosition == 0) {
         return null;
       }
       mmPosition--;
       return mmHistory.get(mmPosition);
     }

     /**
      * Traverses the history forward by one position, returns and item at that position.
      */
     private EditItem getNext() {
       if (mmPosition == mmHistory.size()) {
         return null;
       }
       EditItem item = mmHistory.get(mmPosition);
       mmPosition++;
       return item;
     }
   }

   /**
    * Represents a single edit operation.
    */
   private final class EditItem {
     private final int mmIndex;
     private final CharSequence mmBefore;
     private final CharSequence mmAfter;

     /**
      * Constructs EditItem of a modification that was applied at position start and replaced
      * CharSequence before with CharSequence after.
      */
     public EditItem(int start, CharSequence before, CharSequence after) {
       mmIndex = start;
       mmBefore = before;
       mmAfter = after;
     }
   }

   private void undo() {
     EditItem edit = mHistory.getPrevious();
     if (edit == null) {
       return;
     }
     Editable text = mContentText.getText();
     int start = edit.mmIndex;
     int end = start + (edit.mmAfter != null ? edit.mmAfter.length() : 0);
     mIsUndoOrRedo = true;
     text.replace(start, end, edit.mmBefore);
     mIsUndoOrRedo = false;
     // This will get rid of underlines inserted when editor tries to come up with a suggestion.
     for (Object o : text.getSpans(0, text.length(), UnderlineSpan.class)) {
       text.removeSpan(o);
     }
     Selection.setSelection(text, edit.mmBefore == null ? start : (start + edit.mmBefore.length()));
   }

   private void redo() {
     EditItem edit = mHistory.getNext();
     if (edit == null) {
       return;
     }
     Editable text = mContentText.getText();
     int start = edit.mmIndex;
     int end = start + (edit.mmBefore != null ? edit.mmBefore.length() : 0);
     mIsUndoOrRedo = true;
     text.replace(start, end, edit.mmAfter);
     mIsUndoOrRedo = false;
     for (Object o : text.getSpans(0, text.length(), UnderlineSpan.class)) {
       text.removeSpan(o);
     }
     Selection.setSelection(text, edit.mmAfter == null ? start : (start + edit.mmAfter.length()));
   }

   @Override
   public void onClick(DialogInterface dialog, int which) {
     int start = mContentText.getSelectionStart();
     int end = mContentText.getSelectionEnd();
     String original = mContentText.getText().toString();
     if (start == end || which != AlertDialog.BUTTON_NEGATIVE) {
       end = original.length();
     }
     if (which == AlertDialog.BUTTON_NEUTRAL) {
       start += 1;
     }
     if (mSearchStart.isChecked()) {
       start = 0;
       end = original.length();
     }
     String findText = mSearchFind.getText().toString();
     String replaceText = mSearchReplace.getText().toString();
     String search = Pattern.quote(findText);
     int flags = 0;
     if (!mSearchCase.isChecked()) {
       flags |= Pattern.CASE_INSENSITIVE;
     }
     if (mSearchWord.isChecked()) {
       search = "\\b" + search + "\\b";
     }
     Pattern p = Pattern.compile(search, flags);
     Matcher m = p.matcher(original);
     m.region(start, end);
     if (!m.find()) {
       Toast.makeText(this, "Search not found.", Toast.LENGTH_SHORT).show();
       return;
     }
     int foundpos = m.start();
     if (which != AlertDialog.BUTTON_NEGATIVE) { // Find
       mContentText.setSelection(foundpos, foundpos + findText.length());
     } else { // Replace
       String s;
       // Seems to be a bug in the android 2.2 implementation of replace... regions not returning
       // whole string.
       m = p.matcher(original.substring(start, end));
       String replace = Matcher.quoteReplacement(replaceText);
       if (mSearchAll.isChecked()) {
         s = m.replaceAll(replace);
       } else {
         s = m.replaceFirst(replace);
       }
       mContentText.setText(original.substring(0, start) + s + original.substring(end));
       mContentText.setSelection(foundpos, foundpos + replaceText.length());
     }
     mContentText.requestFocus();
   }
 }
	/*
	* Copyright (C) 2009 Google Inc.
	*
	* 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.savedInstanceState See the License for the specific language
	* governing permissions and limitations under the License.
	*/

	package com.googlecode.android_scripting.activity;

	import android.app.Activity;
	import android.app.AlertDialog;
	import android.app.Dialog;
	import android.content.DialogInterface;
	import android.content.DialogInterface.OnClickListener;
	import android.content.Intent;
	import android.content.SharedPreferences;
	import android.content.SharedPreferences.Editor;
	import android.media.AudioManager;
	import android.os.Bundle;
	import android.preference.PreferenceManager;
	import android.text.Editable;
	import android.text.InputFilter;
	import android.text.InputType;
	import android.text.Selection;
	import android.text.Spanned;
	import android.text.TextWatcher;
	import android.text.style.UnderlineSpan;
	import android.view.KeyEvent;
	import android.view.Menu;
	import android.view.MenuItem;
	import android.view.View;
	import android.widget.CheckBox;
	import android.widget.EditText;
	import android.widget.Toast;

	import com.googlecode.android_scripting.Analytics;
	import com.googlecode.android_scripting.BaseApplication;
	import com.googlecode.android_scripting.Constants;
	import com.googlecode.android_scripting.FileUtils;
	import com.googlecode.android_scripting.Log;
	import com.googlecode.android_scripting.R;
	import com.googlecode.android_scripting.ScriptStorageAdapter;
	import com.googlecode.android_scripting.dialog.Help;
	import com.googlecode.android_scripting.interpreter.Interpreter;
	import com.googlecode.android_scripting.interpreter.InterpreterConfiguration;

	import java.io.File;
	import java.io.IOException;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.List;
	import java.util.Vector;
	import java.util.regex.Matcher;
	import java.util.regex.Pattern;

	/**
	* A text editor for scripts.
	*
	* @author Damon Kohler (damonkohler@gmail.com)
	*/
	public class ScriptEditor extends Activity implements OnClickListener {
	private static final int DIALOG_FIND_REPLACE = 2;
	private static final int DIALOG_LINE = 1;
	private EditText mNameText;
	private EditText mContentText;
	private boolean mScheduleMoveLeft;
	private String mLastSavedContent;
	private SharedPreferences mPreferences;
	private InterpreterConfiguration mConfiguration;
	private ContentTextWatcher mWatcher;
	private EditHistory mHistory;
	private File mScript;
	private EditText mLineNo;

	private boolean mIsUndoOrRedo = false;
	private boolean mEnableAutoClose;
	private boolean mAutoIndent;

	private EditText mSearchFind;
	private EditText mSearchReplace;
	private CheckBox mSearchCase;
	private CheckBox mSearchWord;
	private CheckBox mSearchAll;
	private CheckBox mSearchStart;

	private static enum MenuId {
	SAVE, SAVE_AND_RUN, PREFERENCES, API_BROWSER, HELP, SHARE, GOTO, SEARCH;
	public int getId() {
	return ordinal() + Menu.FIRST;
	}
	}

	private static enum RequestCode {
	RPC_HELP
	}

	private int readIntPref(String key, int defaultValue, int maxValue) {
	int val;
	try {
	val = Integer.parseInt(mPreferences.getString(key, Integer.toString(defaultValue)));
	} catch (NumberFormatException e) {
	val = defaultValue;
	}
	val = Math.max(0, Math.min(val, maxValue));
	return val;
	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.script_editor);
	mNameText = (EditText) findViewById(R.id.script_editor_title);
	mContentText = (EditText) findViewById(R.id.script_editor_body);
	mHistory = new EditHistory();
	mWatcher = new ContentTextWatcher(mHistory);
	mPreferences = PreferenceManager.getDefaultSharedPreferences(this);
	updatePreferences();

	mScript = new File(getIntent().getStringExtra(Constants.EXTRA_SCRIPT_PATH));
	mNameText.setText(mScript.getName());
	mNameText.setSelected(true);
	// NOTE: This appears to be the only way to get Android to put the cursor to the beginning of
	// the EditText field.
	mNameText.setSelection(1);
	mNameText.extendSelection(0);
	mNameText.setSelection(0);
	mLastSavedContent = getIntent().getStringExtra(Constants.EXTRA_SCRIPT_CONTENT);
	if (mLastSavedContent == null) {
	try {
	mLastSavedContent = FileUtils.readToString(mScript);
	} catch (IOException e) {
	Log.e("Failed to read script.", e);
	mLastSavedContent = "";
	} finally {
	}
	}

	mContentText.setText(mLastSavedContent);
	InputFilter[] oldFilters = mContentText.getFilters();
	List<InputFilter> filters = new ArrayList<InputFilter>(oldFilters.length + 1);
	filters.addAll(Arrays.asList(oldFilters));
	filters.add(new ContentInputFilter());
	mContentText.setFilters(filters.toArray(oldFilters));
	mContentText.addTextChangedListener(mWatcher);
	mConfiguration = ((BaseApplication) getApplication()).getInterpreterConfiguration();
	// Disables volume key beep.
	setVolumeControlStream(AudioManager.STREAM_MUSIC);
	mLineNo = new EditText(this);
	mLineNo.setInputType(InputType.TYPE_CLASS_NUMBER);
	int lastLocation = mPreferences.getInt("lasteditpos." + mScript, -1);
	if (lastLocation >= 0) {
	mContentText.requestFocus();
	mContentText.setSelection(lastLocation);
	}
	Analytics.trackActivity(this);
	}

	@Override
	protected void onResume() {
	super.onResume();
	updatePreferences();
	}

	private void updatePreferences() {
	mContentText.setTextSize(readIntPref("editor_fontsize", 10, 30));
	mEnableAutoClose = mPreferences.getBoolean("enableAutoClose", true);
	mAutoIndent = mPreferences.getBoolean("editor_auto_indent", false);
	mContentText.setHorizontallyScrolling(mPreferences.getBoolean("editor_no_wrap", false));
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
	super.onCreateOptionsMenu(menu);
	menu.add(0, MenuId.SAVE.getId(), 0, "Save & Exit").setIcon(android.R.drawable.ic_menu_save);
	menu.add(0, MenuId.SAVE_AND_RUN.getId(), 0, "Save & Run").setIcon(
	android.R.drawable.ic_media_play);
	menu.add(0, MenuId.PREFERENCES.getId(), 0, "Preferences").setIcon(
	android.R.drawable.ic_menu_preferences);
	menu.add(0, MenuId.API_BROWSER.getId(), 0, "API Browser").setIcon(
	android.R.drawable.ic_menu_info_details);
	menu.add(0, MenuId.HELP.getId(), 0, "Help").setIcon(android.R.drawable.ic_menu_help);
	menu.add(0, MenuId.SHARE.getId(), 0, "Share").setIcon(android.R.drawable.ic_menu_share);
	menu.add(0, MenuId.GOTO.getId(), 0, "GoTo").setIcon(android.R.drawable.ic_menu_directions);
	menu.add(0, MenuId.SEARCH.getId(), 0, "Find").setIcon(android.R.drawable.ic_menu_search);
	return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
	if (item.getItemId() == MenuId.SAVE.getId()) {
	save();
	finish();
	} else if (item.getItemId() == MenuId.SAVE_AND_RUN.getId()) {
	save();
	Interpreter interpreter =
	mConfiguration.getInterpreterForScript(mNameText.getText().toString());
	if (interpreter != null) { // We may be editing an unknown type.
	Intent intent = new Intent(this, ScriptingLayerService.class);
	intent.setAction(Constants.ACTION_LAUNCH_FOREGROUND_SCRIPT);
	intent.putExtra(Constants.EXTRA_SCRIPT_PATH, mScript.getAbsolutePath());
	startService(intent);
	} else {
	// TODO(damonkohler): Should remove menu option.
	Toast.makeText(this, "Can't run this type.", Toast.LENGTH_SHORT).show();
	}
	finish();
	} else if (item.getItemId() == MenuId.PREFERENCES.getId()) {
	startActivity(new Intent(this, Preferences.class));
	} else if (item.getItemId() == MenuId.API_BROWSER.getId()) {
	Intent intent = new Intent(this, ApiBrowser.class);
	intent.putExtra(Constants.EXTRA_SCRIPT_PATH, mNameText.getText().toString());
	intent.putExtra(Constants.EXTRA_INTERPRETER_NAME,
	mConfiguration.getInterpreterForScript(mNameText.getText().toString()).getName());
	intent.putExtra(Constants.EXTRA_SCRIPT_TEXT, mContentText.getText().toString());
	startActivityForResult(intent, RequestCode.RPC_HELP.ordinal());
	} else if (item.getItemId() == MenuId.HELP.getId()) {
	Help.show(this);
	} else if (item.getItemId() == MenuId.SHARE.getId()) {
	Intent intent = new Intent(Intent.ACTION_SEND);
	intent.putExtra(Intent.EXTRA_TEXT, mContentText.getText().toString());
	intent.putExtra(Intent.EXTRA_SUBJECT, "Share " + mNameText.getText().toString());
	intent.setType("text/plain");
	startActivity(Intent.createChooser(intent, "Send Script to:"));
	} else if (item.getItemId() == MenuId.GOTO.getId()) {
	showDialog(DIALOG_LINE);
	} else if (item.getItemId() == MenuId.SEARCH.getId()) {
	showDialog(DIALOG_FIND_REPLACE);
	}
	return super.onOptionsItemSelected(item);
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	super.onActivityResult(requestCode, resultCode, data);
	RequestCode request = RequestCode.values()[requestCode];

	if (resultCode == RESULT_OK) {
	switch (request) {
	case RPC_HELP:
	String rpcText = data.getStringExtra(Constants.EXTRA_RPC_HELP_TEXT);
	insertContent(rpcText);
	break;
	default:
	break;
	}
	} else {
	switch (request) {
	case RPC_HELP:
	break;
	default:
	break;
	}
	}
	}

	private void save() {
	int start = mContentText.getSelectionStart();
	mLastSavedContent = mContentText.getText().toString();
	mScript = new File(mScript.getParent(), mNameText.getText().toString());
	ScriptStorageAdapter.writeScript(mScript, mLastSavedContent);
	Toast.makeText(this, "Saved " + mNameText.getText().toString(), Toast.LENGTH_SHORT).show();
	Editor e = mPreferences.edit();
	e.putInt("lasteditpos." + mScript, start);
	e.commit();
	}

	private void insertContent(String text) {
	int selectionStart = Math.min(mContentText.getSelectionStart(), mContentText.getSelectionEnd());
	int selectionEnd = Math.max(mContentText.getSelectionStart(), mContentText.getSelectionEnd());
	mContentText.getEditableText().replace(selectionStart, selectionEnd, text);
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
	if (keyCode == KeyEvent.KEYCODE_BACK && hasContentChanged()) {
	AlertDialog.Builder alert = new AlertDialog.Builder(this);
	setVolumeControlStream(AudioManager.STREAM_MUSIC);
	alert.setCancelable(false);
	alert.setTitle("Confirm exit");
	alert.setMessage("Would you like to save?");
	alert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
	public void onClick(DialogInterface dialog, int whichButton) {
	save();
	finish();
	}
	});
	alert.setNegativeButton("No", new DialogInterface.OnClickListener() {
	public void onClick(DialogInterface dialog, int whichButton) {
	finish();
	}
	});
	alert.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
	public void onClick(DialogInterface dialog, int whichButton) {
	}
	});
	alert.show();
	return true;
	} else if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
	redo();
	return true;
	} else if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
	undo();
	return true;
	} else if (keyCode == KeyEvent.KEYCODE_SEARCH) {
	showDialog(DIALOG_FIND_REPLACE);
	return true;
	} else {
	return super.onKeyDown(keyCode, event);
	}
	}

	@Override
	protected Dialog onCreateDialog(int id, Bundle args) {
	AlertDialog.Builder b = new AlertDialog.Builder(this);
	if (id == DIALOG_LINE) {
	b.setTitle("Goto Line");
	b.setView(mLineNo);
	b.setPositiveButton("Ok", new OnClickListener() {

	@Override
	public void onClick(DialogInterface dialog, int which) {
	gotoLine(Integer.parseInt(mLineNo.getText().toString()));
	}
	});
	b.setNegativeButton("Cancel", null);
	return b.create();
	} else if (id == DIALOG_FIND_REPLACE) {
	View v = getLayoutInflater().inflate(R.layout.findreplace, null);
	mSearchFind = (EditText) v.findViewById(R.id.searchFind);
	mSearchReplace = (EditText) v.findViewById(R.id.searchReplace);
	mSearchAll = (CheckBox) v.findViewById(R.id.searchAll);
	mSearchCase = (CheckBox) v.findViewById(R.id.searchCase);
	mSearchStart = (CheckBox) v.findViewById(R.id.searchStart);
	mSearchWord = (CheckBox) v.findViewById(R.id.searchWord);
	b.setTitle("Search and Replace");
	b.setView(v);
	b.setPositiveButton("Find", this);
	b.setNeutralButton("Next", this);
	b.setNegativeButton("Replace", this);
	return b.create();
	}

	return super.onCreateDialog(id, args);
	}

	@Override
	protected void onPrepareDialog(int id, Dialog dialog, Bundle args) {
	if (id == DIALOG_LINE) {
	mLineNo.setText(String.valueOf(getLineNo()));
	} else if (id == DIALOG_FIND_REPLACE) {
	mSearchStart.setChecked(false);
	}
	super.onPrepareDialog(id, dialog, args);
	}

	protected int getLineNo() {
	int pos = mContentText.getSelectionStart();
	String text = mContentText.getText().toString();
	int i = 0;
	int n = 1;
	while (i < pos) {
	int j = text.indexOf("\n", i);
	if (j < 0) {
	break;
	}
	i = j + 1;
	if (i < pos) {
	n += 1;
	}
	}
	return n;
	}

	protected void gotoLine(int line) {
	String text = mContentText.getText().toString();
	if (text.length() < 1) {
	return;
	}
	int i = 0;
	int n = 1;
	while (i < text.length() && n < line) {
	int j = text.indexOf("\n", i);
	if (j < 0) {
	break;
	}
	i = j + 1;
	n += 1;
	}
	mContentText.setSelection(Math.min(text.length() - 1, i));
	}

	@Override
	protected void onUserLeaveHint() {
	if (hasContentChanged()) {
	save();
	}
	}

	private boolean hasContentChanged() {
	return !mLastSavedContent.equals(mContentText.getText().toString());
	}

	private final class ContentInputFilter implements InputFilter {
	@Override
	public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart,
	int dend) {
	if (end - start == 1) {
	Interpreter ip = mConfiguration.getInterpreterForScript(mNameText.getText().toString());
	String auto = null;
	if (ip != null && mEnableAutoClose) {
	auto = ip.getLanguage().autoClose(source.charAt(start));
	}
	// Auto indent code?
	if (auto == null && source.charAt(start) == '\n' && mAutoIndent) {
	int i = dstart - 1;
	int spaces = 0;
	while ((i >= 0) && dest.charAt(i) != '\n') {
	i -= 1; // Find start of line.
	}
	i += 1;
	while (i < dest.length() && dest.charAt(i++) == ' ') {
	spaces += 1;
	}
	if (spaces > 0) {
	return String.format("\n%" + spaces + "s", " ");
	}
	}
	if (auto != null) {
	mScheduleMoveLeft = true;
	return auto;
	}
	}
	return null;
	}
	}

	private final class ContentTextWatcher implements TextWatcher {
	private final EditHistory mmEditHistory;
	private CharSequence mmBeforeChange;
	private CharSequence mmAfterChange;

	private ContentTextWatcher(EditHistory history) {
	mmEditHistory = history;
	}

	@Override
	public void onTextChanged(CharSequence s, int start, int before, int count) {
	if (!mIsUndoOrRedo) {
	mmAfterChange = s.subSequence(start, start + count);
	mmEditHistory.add(new EditItem(start, mmBeforeChange, mmAfterChange));
	}
	}

	@Override
	public void beforeTextChanged(CharSequence s, int start, int count, int after) {
	if (!mIsUndoOrRedo) {
	mmBeforeChange = s.subSequence(start, start + count);
	}
	}

	@Override
	public void afterTextChanged(Editable s) {
	if (mScheduleMoveLeft) {
	mScheduleMoveLeft = false;
	Selection.moveLeft(mContentText.getText(), mContentText.getLayout());
	}
	}
	}

	/**
	* Keeps track of all the edit history of a text.
	*/
	private final class EditHistory {
	int mmPosition = 0;
	private final Vector<EditItem> mmHistory = new Vector<EditItem>();

	/**
	* Adds a new edit operation to the history at the current position. If executed after a call to
	* getPrevious() removes all the future history (elements with positions >= current history
	* position).
	*
	*/
	private void add(EditItem item) {
	mmHistory.setSize(mmPosition);
	mmHistory.add(item);
	mmPosition++;
	}

	/**
	* Traverses the history backward by one position, returns and item at that position.
	*/
	private EditItem getPrevious() {
	if (mmPosition == 0) {
	return null;
	}
	mmPosition--;
	return mmHistory.get(mmPosition);
	}

	/**
	* Traverses the history forward by one position, returns and item at that position.
	*/
	private EditItem getNext() {
	if (mmPosition == mmHistory.size()) {
	return null;
	}
	EditItem item = mmHistory.get(mmPosition);
	mmPosition++;
	return item;
	}
	}

	/**
	* Represents a single edit operation.
	*/
	private final class EditItem {
	private final int mmIndex;
	private final CharSequence mmBefore;
	private final CharSequence mmAfter;

	/**
	* Constructs EditItem of a modification that was applied at position start and replaced
	* CharSequence before with CharSequence after.
	*/
	public EditItem(int start, CharSequence before, CharSequence after) {
	mmIndex = start;
	mmBefore = before;
	mmAfter = after;
	}
	}

	private void undo() {
	EditItem edit = mHistory.getPrevious();
	if (edit == null) {
	return;
	}
	Editable text = mContentText.getText();
	int start = edit.mmIndex;
	int end = start + (edit.mmAfter != null ? edit.mmAfter.length() : 0);
	mIsUndoOrRedo = true;
	text.replace(start, end, edit.mmBefore);
	mIsUndoOrRedo = false;
	// This will get rid of underlines inserted when editor tries to come up with a suggestion.
	for (Object o : text.getSpans(0, text.length(), UnderlineSpan.class)) {
	text.removeSpan(o);
	}
	Selection.setSelection(text, edit.mmBefore == null ? start : (start + edit.mmBefore.length()));
	}

	private void redo() {
	EditItem edit = mHistory.getNext();
	if (edit == null) {
	return;
	}
	Editable text = mContentText.getText();
	int start = edit.mmIndex;
	int end = start + (edit.mmBefore != null ? edit.mmBefore.length() : 0);
	mIsUndoOrRedo = true;
	text.replace(start, end, edit.mmAfter);
	mIsUndoOrRedo = false;
	for (Object o : text.getSpans(0, text.length(), UnderlineSpan.class)) {
	text.removeSpan(o);
	}
	Selection.setSelection(text, edit.mmAfter == null ? start : (start + edit.mmAfter.length()));
	}

	@Override
	public void onClick(DialogInterface dialog, int which) {
	int start = mContentText.getSelectionStart();
	int end = mContentText.getSelectionEnd();
	String original = mContentText.getText().toString();
	if (start == end \|\| which != AlertDialog.BUTTON_NEGATIVE) {
	end = original.length();
	}
	if (which == AlertDialog.BUTTON_NEUTRAL) {
	start += 1;
	}
	if (mSearchStart.isChecked()) {
	start = 0;
	end = original.length();
	}
	String findText = mSearchFind.getText().toString();
	String replaceText = mSearchReplace.getText().toString();
	String search = Pattern.quote(findText);
	int flags = 0;
	if (!mSearchCase.isChecked()) {
	flags \|= Pattern.CASE_INSENSITIVE;
	}
	if (mSearchWord.isChecked()) {
	search = "\\b" + search + "\\b";
	}
	Pattern p = Pattern.compile(search, flags);
	Matcher m = p.matcher(original);
	m.region(start, end);
	if (!m.find()) {
	Toast.makeText(this, "Search not found.", Toast.LENGTH_SHORT).show();
	return;
	}
	int foundpos = m.start();
	if (which != AlertDialog.BUTTON_NEGATIVE) { // Find
	mContentText.setSelection(foundpos, foundpos + findText.length());
	} else { // Replace
	String s;
	// Seems to be a bug in the android 2.2 implementation of replace... regions not returning
	// whole string.
	m = p.matcher(original.substring(start, end));
	String replace = Matcher.quoteReplacement(replaceText);
	if (mSearchAll.isChecked()) {
	s = m.replaceAll(replace);
	} else {
	s = m.replaceFirst(replace);
	}
	mContentText.setText(original.substring(0, start) + s + original.substring(end));
	mContentText.setSelection(foundpos, foundpos + replaceText.length());
	}
	mContentText.requestFocus();
	}
	}