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[Formatter2] append newLine + spaces [message #1803049]

Thu, 21 February 2019 13:20

ayman salah

Messages: 131
Registered: June 2015

Senior Member

Hi all,

I am trying to achieve alignment with list opening bracket, but I can't.

Here is how I am trying:

Grammar:

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

DSL returns XTDSL:
	models+=Model*
;

Model returns XTModel:
	{XTModel} 'startList' '(' greetings+=Greeting*')'';';
	
Greeting returns XTGreeting:
	'list' ids_list=identifier_list ':' 'endlist' ';';

identifier_list returns XTIdentifierList:
	ids+=identifier (',' ids+=identifier)*
;

identifier returns XTIdentifier:
	{XTIdentifier} ID
;

Formatter:

	def dispatch void format(XTDSL xtdsl, extension IFormattableDocument document) {
		xtdsl.models.forEach[format]
	}

	def dispatch void format(XTModel xtmodel, extension IFormattableDocument document) {
		xtmodel.greetings.forEach[format; append[newLine]]
		xtmodel.regionFor.keyword("startList").append[oneSpace]
		xtmodel.regionFor.keyword("(").append[newLine]
		xtmodel.regionFor.keyword(")").prepend[noSpace]
		xtmodel.regionFor.keyword(";").prepend[noSpace]
		xtmodel.append[newLine]
		alignGreetingsOnOpenBracket(xtmodel.greetings, document)
	}

	def void alignGreetingsOnOpenBracket(EList<XTGreeting> greetings, extension IFormattableDocument document) {
		val precedingString = "startList ("
		for (greeting : greetings) {
			greeting.prepend[space = Strings.repeat(" ", precedingString .length); highPriority]
		}
	}

What happens is:

startList (
list A : endlist;
list B : endlist;
list C : endlist;
);

While I expect:

startList (
           list A : endlist;
           list B : endlist;
           list C : endlist;
);

Why does append[newLine] result in ignoring any spaces added after (newLine = newLine and spaces ignored)?

I know that I can use interior[indent], but that would result in indenting using whatever tab width is set, which is not necessarily going to match the width of "startList (".

[Updated on: Sun, 24 February 2019 10:39]

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Re: [Formatter2] append newLine + spaces [message #1803055 is a reply to message #1803049]

Thu, 21 February 2019 14:07

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Please use the indent feature to implement
Indentations

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

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Re: [Formatter2] append newLine + spaces [message #1803161 is a reply to message #1803055]

Sun, 24 February 2019 10:37

ayman salah

Messages: 131
Registered: June 2015

Senior Member

I know that I am supposed to use the indent feature.
But the indent feature uses the tab width set by the user.

I want to be able to set the indent width for each type of list to match the (list type + space + open bracket) width.

For example:

greetingsList (
               greeting g1;
               greeting g2;
);

asdList (
         asd a1;
         asd a2;
);

You get me?

[Updated on: Sun, 24 February 2019 10:38]

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Re: [Formatter2] append newLine + spaces [message #1803162 is a reply to message #1803161]

Sun, 24 February 2019 10:44

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

did you have a look at the example here:

https://de.slideshare.net/meysholdt/xtexts-new-formatter-api

(Page 139)

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

[Updated on: Sun, 24 February 2019 11:08]

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Re: [Formatter2] append newLine + spaces [message #1803165 is a reply to message #1803162]

Sun, 24 February 2019 13:45

ayman salah

Messages: 131
Registered: June 2015

Senior Member

Well, yes I have.

But that's not what I am talking about I guess.

If I understand correctly, the slide you are talking about adjusts the space width before the '=>' not before each transition (which is what I need).

The slide controls this part (*):

state baz
     1***=> foo;
     12**=> foo;
     123*=> foo;
end

I want to control this part (*):

state baz
*****1   => foo;
*****12  => foo;
*****123 => foo;
end

Let's say my grammar has states and has lists containing transitions. I would like to have the following result:

state baz
*****1   => foo;
*****12  => foo;
*****123 => foo;
end
list bar
****1   => foo;
****12  => foo;
****123 => foo;
end

Am I clear?

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Re: [Formatter2] append newLine + spaces [message #1803170 is a reply to message #1803165]

Sun, 24 February 2019 15:45

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

this looks like a bug to me.

workaround:

def dispatch void format(XTModel xTModel, extension IFormattableDocument document) {
for (xTGreeting : xTModel.greetings) {
xTGreeting.regionFor.keyword("list").prepend[space = "\n "]
}
}

alternative solution:
https://stackoverflow.com/questions/45305293/how-to-define-different-indentation-levels-in-the-same-document-with-xtext-forma

can you please create a ticket at github.com/eclipse/xtext-core

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

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