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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 2000-2015 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 13, 2002
 * Time: 8:20:36 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.command.CommandProcessor;
import com.intellij.openapi.editor.*;
import com.intellij.openapi.editor.actionSystem.EditorAction;
import com.intellij.openapi.editor.actionSystem.EditorWriteActionHandler;
import com.intellij.openapi.ide.CopyPasteManager;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.util.ui.MacUIUtil;

public class DeleteAction extends EditorAction {
  public DeleteAction() {
    super(new Handler());
  }

  private static class Handler extends EditorWriteActionHandler {
    public Handler() {
      super(true);
    }

    @Override
    public void executeWriteAction(Editor editor, DataContext dataContext) {
      MacUIUtil.hideCursor();
      CommandProcessor.getInstance().setCurrentCommandGroupId(EditorActionUtil.DELETE_COMMAND_GROUP);
      CopyPasteManager.getInstance().stopKillRings();
      SelectionModel selectionModel = editor.getSelectionModel();
      if (!selectionModel.hasSelection()) {
        deleteCharAtCaret(editor);
      }
      else {
        EditorModificationUtil.deleteSelectedText(editor);
      }
    }
  }

  private static int getCaretLineLength(Editor editor) {
    Document document = editor.getDocument();
    if (document.getLineCount() == 0) {
      return 0;
    }
    int lineNumber = editor.getCaretModel().getLogicalPosition().line;
    if (lineNumber >= document.getLineCount()) {
      return 0;
    }
    return document.getLineEndOffset(lineNumber) - document.getLineStartOffset(lineNumber);
  }

  private static int getCaretLineStart(Editor editor) {
    Document document = editor.getDocument();
    if (document.getLineCount() == 0) {
      return 0;
    }
    int lineNumber = editor.getCaretModel().getLogicalPosition().line;
    if (lineNumber >= document.getLineCount()) {
      return document.getLineStartOffset(document.getLineCount() - 1);
    }
    return document.getLineStartOffset(lineNumber);
  }

  public static void deleteCharAtCaret(Editor editor) {
    int lineNumber = editor.getCaretModel().getLogicalPosition().line;
    int afterLineEnd = EditorModificationUtil.calcAfterLineEnd(editor);
    Document document = editor.getDocument();
    int offset = editor.getCaretModel().getOffset();
    if (afterLineEnd < 0
        // There is a possible case that caret is located right before the soft wrap position at the last logical line
        // (popular use case with the soft wraps at the commit message dialog).
        || (offset < document.getTextLength() - 1 && editor.getSoftWrapModel().getSoftWrap(offset) != null)) {
      FoldRegion region = editor.getFoldingModel().getCollapsedRegionAtOffset(offset);
      if (region != null && region.shouldNeverExpand()) {
        document.deleteString(region.getStartOffset(), region.getEndOffset());
        editor.getCaretModel().moveToOffset(region.getStartOffset());
      }
      else {
        document.deleteString(offset, offset + 1);
        editor.getCaretModel().moveToOffset(offset);
      }
      return;
    }

    if (lineNumber + 1 >= document.getLineCount()) return;

    // Do not group delete newline and other deletions.
    CommandProcessor commandProcessor = CommandProcessor.getInstance();
    commandProcessor.setCurrentCommandGroupId(null);

    int nextLineStart = document.getLineStartOffset(lineNumber + 1);
    int nextLineEnd = document.getLineEndOffset(lineNumber + 1);
    if (nextLineEnd - nextLineStart > 0) {
      StringBuilder buf = new StringBuilder();
      StringUtil.repeatSymbol(buf, ' ', afterLineEnd);
      document.insertString(getCaretLineStart(editor) + getCaretLineLength(editor), buf.toString());
      nextLineStart = document.getLineStartOffset(lineNumber + 1);
    }
    int thisLineEnd = document.getLineEndOffset(lineNumber);
    document.deleteString(thisLineEnd, nextLineStart);
  }
}