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ID and Fully Qualified name problem [message #1836042]

Fri, 18 December 2020 17:43

Alex Gor

Messages: 159
Registered: November 2014
Location: Russia

Senior Member

Dear All

A DSL has a construction like
Library org.houseofbadger.lib.common.lib P1="PPP" WITH NAME bla-bla

I created the following rule in grammar

library_import_definition:
"Library" QualifiedName parameter_expression* alias_name*;

QualifiedName:
(ID ('.' ID)*);

But I observer the following error
mismatched input 'mismatched input 'lib.lib1.lib2' expecting RULE_ID' expecting RULE_ID

In case I put the following code

Library lib.lib1.lib2
Library lib.lib1.lib3
Library lib.lib1.lib4

Could you please help me to resolve this issue?

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Re: ID and Fully Qualified name problem [message #1836057 is a reply to message #1836042]

Sat, 19 December 2020 06:21

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

the information you provided is not complete enough to answer this question.
i assume there is something else in your grammar that causes the problem.
i propose you should debug the lexer (next token) to see that is actually lexed.

please provide a complete BUT minimal hello world grammar and unit test that show the problem

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

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Re: ID and Fully Qualified name problem [message #1836103 is a reply to message #1836057]

Mon, 21 December 2020 09:25

Alex Gor

Messages: 159
Registered: November 2014
Location: Russia

Senior Member

Hello

Seems to me I found the root cause of this issue. You are right the reason is another incorrect definition in my grammar

I need to defined element of path to file in my grammar. Because import of the library can reference directly to the file
I used the following :

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

ResourcePath:
(('./')|( '../') *)(PATH_ELEMENT'/' | PATH_ELEMENT)* FileName
;

FileName:
PATH_ELEMENT'.'PATH_ELEMENT
;

When I try to generate Xtext artifacts i observed the following error message

error(208): ../org.houseofbadger.rfl/src-gen/org/houseofbadger/parser/antlr/internal/InternalRFL.g:888:1: The following token definitions can never be matched because prior tokens match the same input: RULE_ID,RULE_INT
error(208): ../org.houseofbadger.rfl.ide/src-gen/org/houseofbadger/ide/contentassist/antlr/internal/InternalRFL.g:2032:1: The following token definitions can never be matched because prior tokens match the same input: RULE_ID,RULE_INT

To be honest it is clear because there is a conflict between number definition (RULE_INT) and my PATH_ELEMENT definition

So my question is how to correctly to define element of path

I need to have the describing something like :

Library ../../com/resources/storage.txt
Library ./lib-ext.lib

Thank you in advance

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Re: ID and Fully Qualified name problem [message #1836104 is a reply to message #1836103]

Mon, 21 December 2020 10:13

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

you should have a look at the concept of Data Type rules and/or IValueConverters

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

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Re: ID and Fully Qualified name problem [message #1836211 is a reply to message #1836104]

Thu, 24 December 2020 11:01

Alex Gor

Messages: 159
Registered: November 2014
Location: Russia

Senior Member

I used the following way may be is not optimal but work

ResourcePath:
	(('./')|( '../') *)(PATH_ELEMENT)* FileName
;


PATH_ELEMENT returns ecore::EString : 
	((INT) (ID('/')*)) | (ID('/')*) ;


FileName:
	 (((INT)(ID)) | (ID) | (INT))'.'(((INT)(ID))|(ID) | (INT))
;

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