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grammar for ignore string [message #1855515]

Wed, 19 October 2022 03:49

Eclipse User

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

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

Thu, 20 October 2022 03:17

Eclipse User

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

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

Tue, 25 October 2022 03:03

Eclipse User

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 03:03] by Moderator

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

Tue, 25 October 2022 14:29

Eclipse User

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

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

Wed, 26 October 2022 00:42

Eclipse User

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')?;

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

Wed, 26 October 2022 00:59

Eclipse User

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 01:11] by Moderator

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