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Format on Save in Editor [message #1763961]

Tue, 23 May 2017 12:11

Koen Staal

Messages: 70
Registered: October 2014

Member

Hi, i want to format the file when it is saved in the editor.

The current implementation re-uses the default xtext-eclipse formatting but it has some unintended behavior. It will only format the selected text if there is text select.
We want the whole file formatted even when there is text selected.

public class DslEditor extends XtextEditor {
	
	@Override
	public void doSave(IProgressMonitor progressMonitor) {
		ITextOperationTarget target = getSourceViewer().getTextOperationTarget();
		if(target.canDoOperation(ISourceViewer.FORMAT) ) {
			target.doOperation(ISourceViewer.FORMAT);
		}		
		super.doSave(progressMonitor);		
	}

Is there a solution possible where i dont need to change the default formatting implementation in the TextOperationTarget?

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Re: Format on Save in Editor [message #1764003 is a reply to message #1763961]

Tue, 23 May 2017 20:54

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

simply setting the selection does not work?

sourceViewer.setSelectedRange(offset, length);
sourceViewer.getTextOperationTarget().doOperation(ISourceViewer.FORMAT);

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Format on Save in Editor [message #1764058 is a reply to message #1764003]

Wed, 24 May 2017 13:12

Koen Staal

Messages: 70
Registered: October 2014

Member

Thanks for your suggestion. With manipulating the selection we can indeed format the whole file.

Since we dont really want to change the selection we have to put the selection back after the format. The file can be changed dramatically, so the selection might not even work anymore after the format and we need to check/change it.

This is the current code but i am not sure yet if we will support this feature :).

	@Override
	public void doSave(IProgressMonitor progressMonitor) {
		ITextOperationTarget target = getSourceViewer().getTextOperationTarget();
		if(target.canDoOperation(ISourceViewer.FORMAT) ) {
			Point selection = getSourceViewer().getSelectedRange();			
			getSourceViewer().setSelectedRange(0, getDocument().getLength());			
			target.doOperation(ISourceViewer.FORMAT);			
						
			int max = getDocument().getLength();			
			if(max <= selection.x) {
				getSourceViewer().setSelectedRange(max, 0);
			} else {
				int selectRange =  (max >= selection.x + selection.y) ? selection.y : max - selection.x;
				getSourceViewer().setSelectedRange(selection.x, selectRange);
			}			
		}		
		super.doSave(progressMonitor);		
	}

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