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/*******************************************************************************
* Copyright (c) 2007, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Benjamin Muskalla - initial API and implementation - https://bugs.eclipse.org/bugs/show_bug.cgi?id=41573
*******************************************************************************/
package org.eclipse.ui.texteditor;
import java.util.ResourceBundle;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITextSelection;
/**
* Action for joining two or more lines together by deleting the
* line delimiters and trimming the whitespace between them.
*
* @since 3.3
*/
public class JoinLinesAction extends TextEditorAction {
private String fJoint= null;
/**
* Creates a line joining action.
*
* @param bundle the resource bundle for UI strings
* @param prefix the prefix for the property keys into <code>bundle</code>
* @param editor the editor
* @param joint the string to put between the lines
*/
public JoinLinesAction(ResourceBundle bundle, String prefix, ITextEditor editor, String joint) {
super(bundle, prefix, editor);
Assert.isLegal(joint != null);
fJoint= joint;
update();
}
@Override
public void run() {
ITextEditor editor= getTextEditor();
if (editor == null)
return;
if (!validateEditorInputState())
return;
IDocument document= getDocument(editor);
if (document == null)
return;
ITextSelection selection= getSelection(editor);
if (selection == null)
return;
int startLine= selection.getStartLine();
int endLine= selection.getEndLine();
try {
int caretOffset= joinLines(document, startLine, endLine);
if (caretOffset > -1)
editor.selectAndReveal(caretOffset, 0);
} catch (BadLocationException e) {
// should not happen
}
}
/**
* Returns the editor's document.
*
* @param editor the editor
* @return the editor's document
*/
private static IDocument getDocument(ITextEditor editor) {
IDocumentProvider documentProvider= editor.getDocumentProvider();
if (documentProvider == null)
return null;
IDocument document= documentProvider.getDocument(editor.getEditorInput());
if (document == null)
return null;
return document;
}
/**
* Returns the editor's selection.
*
* @param editor the editor
* @return the editor's selection
*/
private static ITextSelection getSelection(ITextEditor editor) {
ISelectionProvider selectionProvider= editor.getSelectionProvider();
if (selectionProvider == null)
return null;
ISelection selection= selectionProvider.getSelection();
if (!(selection instanceof ITextSelection))
return null;
return (ITextSelection) selection;
}
@Override
public void update() {
super.update();
if (!isEnabled())
return;
if (!canModifyEditor()) {
setEnabled(false);
return;
}
ITextEditor editor= getTextEditor();
setEnabled(editor.isEditable());
}
/**
* Joins several text lines to one line.
*
* @param document the document
* @param startLine the start line
* @param endLine the end line
* @return the new caret offset
* @throws BadLocationException if the document is accessed with wrong line or offset
*/
private int joinLines(IDocument document, int startLine, int endLine) throws BadLocationException {
if (startLine == document.getNumberOfLines() - 1) {
// do nothing because we are in the last line
return -1;
}
if (startLine == endLine)
endLine++; // append join with the next line
StringBuilder buffer= new StringBuilder();
for (int line= startLine; line <= endLine; line++) {
buffer.append(trim(document, line, line == startLine));
if (line != endLine)
buffer.append(fJoint);
}
int startLineOffset= document.getLineOffset(startLine);
int endLineOffset= document.getLineOffset(endLine) + document.getLineLength(endLine) - getLineDelimiterLength(document, endLine);
String replaceString= buffer.toString();
document.replace(startLineOffset, endLineOffset - startLineOffset, replaceString);
return startLineOffset + replaceString.length();
}
private String trim(IDocument document, int line, boolean ignoreLeadingWhitespace) throws BadLocationException {
int lineOffset= document.getLineOffset(line);
int lineLength= document.getLineLength(line);
lineLength= lineLength - getLineDelimiterLength(document, line);
if (!ignoreLeadingWhitespace)
return document.get(lineOffset, lineLength).trim();
while (lineLength > 0 && Character.isWhitespace(document.getChar(lineOffset + lineLength - 1)))
lineLength--;
return document.get(lineOffset, lineLength);
}
private int getLineDelimiterLength(IDocument document, int line) throws BadLocationException {
String lineDelimiter= document.getLineDelimiter(line);
return lineDelimiter != null ? lineDelimiter.length() : 0;
}
}
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