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Preserve Line Breaks [message #1121060]

Mon, 30 September 2013 08:20

Lars Martin

Messages: 24
Registered: July 2009

Junior Member

Following Jan's Blog post I can modify parts of my model. This works great (Xtext 2.4.3) except for Strings where line breaks need to be preserved.

IXtextDocument xtextDocument = xtextEditor.getDocument();
xtextDocument.modify(new IUnitOfWork.Void<XtextResource>() {
	public void process(XtextResource resource) {
		...
		Variable.setValue("a\nb\\nc\\\nd\\\\ne");
		...
	}
}

No matter what type of escaping the NEWLINE char I use, the Xtext editor receive exactly that passed String.

result:
V="a\nb\\nc\\\nd\\\\ne"

expected:
V="a
b
c
d
e"

Any hints how to preserve line breaks?

Regards, Lars M.

[Updated on: Mon, 30 September 2013 08:21]

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Re: Preserve Line Breaks [message #1121116 is a reply to message #1121060]

Mon, 30 September 2013 09:35

Uli Merkel

Messages: 250
Registered: June 2013

Senior Member

perhaps you have to enter it as:

Variable.setValue("a
b
c
d
e");

[Updated on: Mon, 30 September 2013 09:36]

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Re: Preserve Line Breaks [message #1121181 is a reply to message #1121116]

Mon, 30 September 2013 10:59

Lars Martin

Messages: 24
Registered: July 2009

Junior Member

Unfortunately in Java it is not (yet) possible to use multi-line strings. Also the Xtend compiler translates multi-line strings to "...\n...".

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Re: Preserve Line Breaks [message #1121221 is a reply to message #1121181]

Mon, 30 September 2013 11:50

Uli Merkel

Messages: 250
Registered: June 2013

Senior Member

I assumed you were in the xtend world, not in java.

where do you see this escaped string in the XTEXT editor?

I know a couple of entry-forms which re-escape a multiline string to fit in the one-line fields

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Re: Preserve Line Breaks [message #1122059 is a reply to message #1121221]

Tue, 01 October 2013 07:31

Lars Martin

Messages: 24
Registered: July 2009

Junior Member

Also the utility methods:

org.eclipse.xtext.util.Strings.convertFromJavaString
org.eclipse.xtext.util.Strings.convertToJavaString

didn't work.

My environment: My grammar contains a rule like following

Variable:
     name=ID '=' value=STRING;

The preferred formatting of "value" uses line breaks even if every WS would be legal for the post-processing step.

An extract from a sample model:

A="1
2
3"

In a Multipage Editor the user can edit the "value" of a given element in a JFace/SWT Formeditor, synchronization with the underlaying Xtext Document works well:

xtextDocument.readOnly(new IUnitOfWork...) // read the proper model element
..
xtextDocument.modify(new IUnitOfWork...) // write/update the proper model element

.. except for Strings with line breaks. Line breaks get escaped to "\n" when writing back to the XtextDocument.

Regards, Lars M.

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