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Who to get the content of a Multiline-Comment? [message #883277]

Fri, 08 June 2012 07:40

Christian Schwarz

Messages: 31
Registered: July 2009

Member

Hi,

i am writing a dsl to generate some java code and i want to use the content of multiline-comment (of the dsl) in the generated java code.

I figured out that i have to use my own set of terminal-symbols, because 'org.eclipse.xtext.common.Terminals' hides the ML_COMMENT.

My current gramma looks like this:

Attribute :
	(comment=(ML_COMMENT))?
	type=PrimitiveType name=ID optional='?'?;

PrimitiveType:
	'string' | 'int';

terminal ID:
	'^'? ('a'..'z' | 'A'..'Z' | '_') ('a'..'z' | 'A'..'Z' | '_' | '0'..'9')*;

terminal ML_COMMENT :
	'/*' .* '*/';

As you can see i replaced the 'org.eclipse.xtext.common.Terminals' ML_COMMENT by my own terminal definition '/*' .* '*/'.
The disadvantage of this definition is that i get a String, including '/*' and '*/', but i only want the content not the surrounding comment start- and end-symbols.

e.g. for

/*blah blub*/
string myAttribute

i get "/*blah blub*/" but i want "blah blub".

I found many ways that doesn'twork, may be some have a idea to solve the puzzle?

Thanks Chris

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Re: Who to get the content of a Multiline-Comment? [message #883280 is a reply to message #883277]

Fri, 08 June 2012 07:45

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

this is usually done by a ValueConverter

~Christian

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

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Re: Who to get the content of a Multiline-Comment? [message #883297 is a reply to message #883280]

Fri, 08 June 2012 08:28

Christian Schwarz

Messages: 31
Registered: July 2009

Member

..deleted

[Updated on: Fri, 08 June 2012 08:37]

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Re: Who to get the content of a Multiline-Comment? [message #883300 is a reply to message #883280]

Fri, 08 June 2012 08:36

Christian Schwarz

Messages: 31
Registered: July 2009

Member

Hi Christian, thank you for your answer! I implemented a ValueConverter by extending DefaultTerminalConverters, it works Smile

!

Out of interest, is it possible to do the same within the gramma definition?

It tried this, but without success:

Attribute :
   ('/*' comment=(ANY_OTHER)* '*/')?
   type=PrimitiveType name=ID optional='?'?;

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Re: Who to get the content of a Multiline-Comment? [message #883321 is a reply to message #883300]

Fri, 08 June 2012 09:37

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

first of all ANY_OTHER is not a context sensitive any other.
then: you would have to write
comment+=(ANY_OTHER)*
and would get a list of junks

=> no. a valuevonverter is in this case the cleanest solution.

~Christian

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

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