Eclipse Community Forums: TMF (Xtext) » Converting fragment from Antlr to Xtext

Home

Home » Modeling » TMF (Xtext) » Converting fragment from Antlr to Xtext

Converting fragment from Antlr to Xtext [message #1765292]

Thu, 08 June 2017 04:04

Eclipse User

Hi

Can I create a fragment rule for the following Antlr fragment?

SCRIPT
 : '{' SCRIPT_ATOM* '}'
 ;

 fragment SCRIPT_ATOM
  : ~[{}]
  | '"' ~["]* '"'
  | '//' ~[\r\n]*
  | SCRIPT
  ;

I could create a terminal rule as follows.

SCRIPT:
	'{' SCRIPT_ATOM* '}'
;

terminal SCRIPT_ATOM:
  ! ('{' | '}')
  | '"' (!'"')* '"'
  | '//' !('\r'|'\n')*
  //| SCRIPT
;

But SCRIPT parser rule cannot be called inside the terminal rule. What needs to be done here?
Thank you.

Re: Converting fragment from Antlr to Xtext [message #1765298 is a reply to message #1765292]

Thu, 08 June 2017 04:50

Eclipse User

did you consider an additional terminal aka

Scripting:
value=SCRIPT
;

terminal SCRIPT:
'{' SCRIPT_ATOM* '}'
;

terminal SCRIPT_ATOM:
! ('{' | '}')
| '"' (!'"')* '"'
| '//' !('\r'|'\n')*
| SCRIPT
;

Re: Converting fragment from Antlr to Xtext [message #1765302 is a reply to message #1765298]

Thu, 08 June 2017 05:25

Eclipse User

The additional terminal for SCRIPT worked fine. :)

Does having cross references among the grammar rules helps in content assisting? I feel it's hard to maintain cross references in my grammar since it is a bit complex.

Thank you.

Re: Converting fragment from Antlr to Xtext [message #1765305 is a reply to message #1765302]

Thu, 08 June 2017 05:40

Eclipse User

yes it helps. if you do scoping right or the default values are fine it will work out of the box

Previous Topic:	An internal error occurred during: "calculating highlighting".
Next Topic:	JvmModelInferrer - Generate a method call

Goto Forum:

-=] Back to Top [=-

Current Time: Tue Jul 08 06:16:28 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter