Eclipse Community Forums: TMF (Xtext) » grammar for ignore string

Help

Home

Home » Modeling » TMF (Xtext) » grammar for ignore string(xtext grammar )

Show: Today's Messages :: Show Polls :: Message Navigator

grammar for ignore string [message #1855515]

Wed, 19 October 2022 07:49

vikash singh

Messages: 6
Registered: September 2019

Junior Member

FeatureList:
        (elements+=Feature)*;
        
    Feature:
        name= ID';' selection=BooleanConstant ';' *;
    
    BooleanConstant:
        val=BooleanValue;
    
    enum BooleanValue:
        FALSE='FALSE' | TRUE='TRUE';

this is my grammar to parse a file where format is

ActSrv;TRUE;123;
xyz;TRUE;12av;
xyz1;TRUE;abc12;
xyz2;FALSE;123abc;34gh;
xyz3;FALSE;@cb98;xyp;
xyz4;TRUE;;

my requirement is to ignore all string after 2nd ';' or end the matcher and start from new row. but with the current code if there is anything after second column start with string getting stored in new name variable

Report message to a moderator

Re: grammar for ignore string [message #1855546 is a reply to message #1855515]

Thu, 20 October 2022 07:17

Ed Willink

Messages: 7593
Registered: July 2009

Senior Member

Hi

Surely this is easily handled by emulating the single line comment?

terminal SL_COMMENT:
'--' !('\n' | '\r')* ('\r'? '\n')?;

You can just use ';' as the comment character.

Regards

Ed Willink

Report message to a moderator

Re: grammar for ignore string [message #1855639 is a reply to message #1855546]

Tue, 25 October 2022 07:03

vikash singh

Messages: 6
Registered: September 2019

Junior Member

Hi
thanks for your reply . with the single comment logic its commenting the 2nd column too.

1st column : ActSrv;
2nd column: TRUE;

if i mention ";" as comment character it will comment 2nd column( True) too . but i need to comment every thing after TRUE.

[Updated on: Tue, 25 October 2022 07:03]

Report message to a moderator

Re: grammar for ignore string [message #1855651 is a reply to message #1855639]

Tue, 25 October 2022 18:29

Ed Willink

Messages: 7593
Registered: July 2009

Senior Member

Hi

It should work, but since you don't share your code with us we cannot see if you have done something stupid.

I suggest debugging the traditional SL_COMMENT which works and gradually evolve it to what you want.

Regards

Ed Willink

Report message to a moderator

Re: grammar for ignore string [message #1855663 is a reply to message #1855651]

Wed, 26 October 2022 04:42

vikash singh

Messages: 6
Registered: September 2019

Junior Member

grammar com.contiautomotive.featurebase.FeatureReader with org.eclipse.xtext.common.Terminals

generate featureReader "http://www.contiautomotive.com/featurebase/FeatureReader"

FeatureList:
(elements+=Feature)*;

Feature:
name=ID ';' selection=BooleanConstant;

BooleanConstant:
val=BooleanValue;

enum BooleanValue:
FALSE='FALSE' | TRUE='TRUE';

@Override
terminal SL_COMMENT : ';' !('\n'|'\r')* ('\r'? '\n')?;

Report message to a moderator

Re: grammar for ignore string [message #1855664 is a reply to message #1855663]

Wed, 26 October 2022 04:59

Ed Willink

Messages: 7593
Registered: July 2009

Senior Member

Hi

Firstly, since you are replacing SL_COMMENT, you must replace it else run the risk of allowing Xtext's built-in functionality to confuse.

Secondly, the traditional SL_COMMENT as shown in terminal is hidden. As a non-hidden token there may be a different whitespace interaction.

You should start by copying and pasting Terminais.xtext at the top of your grammar, then change the grammar name, then adjust the SL_COMMENT..

Regards

Ed Willink

[Updated on: Wed, 26 October 2022 05:11]

Report message to a moderator

Previous Topic:	Xtext 2.29.0.M2 is out
Next Topic:	Trying to resolve all cross-references of an EObject model from an .aadl file.

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Sun May 28 03:30:02 GMT 2023

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter