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[Beginner] New line, tabs [message #1817153]

Sat, 16 November 2019 15:09

Tijmen Rijmen

Messages: 11
Registered: November 2019

Junior Member

Hi guys,

First of all, I'm completely new to Xtext and completely new to this forum so hi all!

My problem:
I have defined a grammar for my intended DSL and I would like to use Xtext to validate and export files which I can use in a seperate system.

The basic grammar I would like to validate with Xtext:

bgcolor: 000000
bgsize: 1000x1000
box1:
    bgcolor: ff000ff
    position: 50x160
    size: 600x285

Like I said, I'm completely new to Xtext so this is what I came up with: (By far from finished)

Example:
    (ExampleElement+=ExampleElementType)*;

ExampleElementType:
    bgcolor | bgsize;

bgcolor:
	'bgcolor:' name=ID ;  

bgsize:
	'bgsize:' name=ID;

How can I set it up that after entering 'bgcolor:'. 'bgcolor:' will be added to the outline (right now the value I enter after will appear in the outline) and how can I express new lines and tabs.

Thanks in advance!

Kind regards
Tijmen Rijmen

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Re: [Beginner] New line, tabs [message #1817435 is a reply to message #1817153]

Fri, 22 November 2019 06:31

Christian Dietrich

Messages: 14729
Registered: July 2009

Senior Member

Hi,

for the outline you can customize MyDslLabelProvider (the comments there should give you some hints)

for whitespace sensitive languages you can have a look at, but this is not a beginner feature https://www.eclipse.org/Xtext/documentation/307_special_languages.html#whitespace-aware-languages . you could also splitup the inherites WS termimal and split it up into NL and WS and model them explicit but this is not a real supported usecase and will explode in all kind of situations => not beginner friendly. is there a specific reason why you want to model WS explicitely?

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de
Day Job: https://www.everest-systems.com

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Re: [Beginner] New line, tabs [message #1817849 is a reply to message #1817435]

Sun, 01 December 2019 00:23

Tijmen Rijmen

Messages: 11
Registered: November 2019

Junior Member

The specific reason is that I want to create a Yaml file eventually which is going to be used by a different system.

The most ideal situation is that the indents happen right at the moment the user performs the input. I would settle for an option that an extra file is created which is correctly formatted. The file generated should be formatted so that every keyword is on a newline and that keywords in groups are indented by a tab or 2 spaces. Nested groups should be indented with 2 tabs or 4 spaces. How should I start with this? Should I go for the generator or the formatter?

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Re: [Beginner] New line, tabs [message #1817851 is a reply to message #1817849]

Sun, 01 December 2019 07:04

Christian Dietrich

Messages: 14729
Registered: July 2009

Senior Member

generating and formatting a two completely different topics so
i dont know

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de
Day Job: https://www.everest-systems.com

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Re: [Beginner] New line, tabs [message #1817852 is a reply to message #1817851]

Sun, 01 December 2019 08:34

Ed Willink

Messages: 7679
Registered: July 2009

Senior Member

Hi

A generator could be used to just prettyprint but it seems a bit strange. Easier to overload your XXXResourceImpl save to ensure that an XXXSaveImpl corrects indentation as it saves.

I'm not familiar with the 'new' formatter, but if your keywords are well disciplined even the 'old' formatter should get the indentation right. The 'new' formatter may have extra capabilities.

Using the formatter will have the advantage that you get WYSIWYG.

Regards

Ed Willink

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Re: [Beginner] New line, tabs [message #1817855 is a reply to message #1817852]

Sun, 01 December 2019 11:32

Tijmen Rijmen

Messages: 11
Registered: November 2019

Junior Member

Hi guys,

Thanks for your replies. So the way to go is using the formatter.

What I did:
- Added the formatter to my workflow by adding generateStub.
- Added terminal rules for synthetic BEGIN and END
- Added BEGIN and END to block that needs to be indented
- Works as a charm except for one thing. Trying out CTRL + SPACE to get the content-assist (at least I think it's called like that) will terminate the program.

The following error pops up:

Unresolved compilation problem: 
	The code for the static initializer is exceeding the 65535 bytes limit

linking to this rule in InternalIDSLParser.java

public class InternalIDSLParser extends AbstractInternalContentAssistParser {

Can someone explain me what's going on and the proper way to solve this?

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Re: [Beginner] New line, tabs [message #1817858 is a reply to message #1817855]

Sun, 01 December 2019 15:07

Tamas Miklossy

Messages: 162
Registered: February 2016

Senior Member

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Re: [Beginner] New line, tabs [message #1817859 is a reply to message #1817858]

Sun, 01 December 2019 16:03

Tijmen Rijmen

Messages: 11
Registered: November 2019

Junior Member

So the conclusion is I should get rid of all my unordered groups in my code and then it will probably just work.

I tried adding the splitting option in my workflow but that did not work out.

Thanks for your reply!

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