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A packaging of the IntelliJ Community Edition platform-impl library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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.
 */

/*
 * Created by IntelliJ IDEA.
 * User: max
 * Date: May 20, 2002
 * Time: 4:13:37 PM
 * To change template for new class use
 * Code Style | Class Templates options (Tools | IDE Options).
 */
package com.intellij.openapi.editor.actions;

import com.intellij.openapi.actionSystem.DataContext;
import com.intellij.openapi.editor.*;
import com.intellij.openapi.editor.actionSystem.EditorWriteActionHandler;
import com.intellij.openapi.util.Ref;
import com.intellij.openapi.util.TextRange;
import org.jetbrains.annotations.Nullable;

public class ToggleCaseAction extends TextComponentEditorAction {
  public ToggleCaseAction() {
    super(new Handler());
  }

  private static class Handler extends EditorWriteActionHandler {
    @Override
    public void executeWriteAction(final Editor editor, @Nullable Caret caret, DataContext dataContext) {
      final Ref toLowerCase = new Ref(Boolean.FALSE);
      runForCaret(editor, caret, new CaretAction() {
        @Override
        public void perform(Caret caret) {
          if (!caret.hasSelection()) {
            caret.selectWordAtCaret(true);
          }
          String selectedText = caret.getSelectedText();
          if (selectedText != null && !selectedText.equals(toCase(selectedText, true))) {
            toLowerCase.set(Boolean.TRUE);
          }
        }
      });
      runForCaret(editor, caret, new CaretAction() {
        @Override
        public void perform(Caret caret) {
          VisualPosition caretPosition = caret.getVisualPosition();
          int selectionStartOffset = caret.getSelectionStart();
          int selectionEndOffset = caret.getSelectionEnd();
          VisualPosition selectionStartPosition = caret.getSelectionStartPosition();
          VisualPosition selectionEndPosition = caret.getSelectionEndPosition();
          caret.removeSelection();
          String text = editor.getDocument().getText(new TextRange(selectionStartOffset, selectionEndOffset));
          editor.getDocument().replaceString(selectionStartOffset, selectionEndOffset, toCase(text, toLowerCase.get()));
          caret.moveToVisualPosition(caretPosition);
          caret.setSelection(selectionStartPosition, selectionStartOffset, selectionEndPosition, selectionEndOffset);
        }
      });
    }

    private static void runForCaret(Editor editor, Caret caret, CaretAction action) {
      if (caret == null) {
        editor.getCaretModel().runForEachCaret(action);
      }
      else {
        action.perform(caret);
      }
    }
    private static String toCase(final String text, final boolean lower) {
      StringBuilder builder = new StringBuilder(text.length());
      boolean prevIsSlash = false;
      for( int i = 0; i < text.length(); ++i) {
        char c = text.charAt(i);
        if( !prevIsSlash ) {
          c = lower ? Character.toLowerCase(c) : Character.toUpperCase(c);
        }
        prevIsSlash = c == '\\';
        builder.append(c);
      }
      return builder.toString();
    }
  }
}