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Home » Modeling » TMF (Xtext) » Whitespace validator in XText (Resolving the excessive whitespace at the end of a model or a parser rule by raising a validator)

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Whitespace validator in XText [message #1806836]

Thu, 16 May 2019 04:22

Vishal Balaji

Messages: 4
Registered: March 2019

Junior Member

Hi,
I am currently using XText 2.17. My issue is that I have to validate the excess whitespace at the end of a parser rule.

My current XText code is as below:
--------------------------------------------------------------------------------
grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals hidden()

generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

Model:
greetings+=Greeting* ;

Greeting hidden(WS):
'Hello' name=ID WS*'!';

--------------------------------------------------------------------------------
Output Expected:

A warning using validator for :
Hello XText !

But instead it works fine.
The issue is I don't want to use hidden and should parse white space with a warning. The current code doesn't allow me to do it. It just allows me to write with as many whitespace as possible. Thanks in advance.

Note: The space which I gave between XText and ! is hidden in the message.

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Re: Whitespace validator in XText [message #1806837 is a reply to message #1806836]

Thu, 16 May 2019 04:33

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi, is there any reason not to use the nodemodel

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

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Re: Whitespace validator in XText [message #1806959 is a reply to message #1806837]

Mon, 20 May 2019 05:27

Vishal Balaji

Messages: 4
Registered: March 2019

Junior Member

Hi Dietrich,
Its really delightful to see you responding to my post. I am a beginner in XText, hence I can't get to your point of using nodemodel. Also I found in web that even Formatter will be useful to implement my requirement of White space validation . May I have your guidelines in this case.

Thanks,
Vishal.

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Re: Whitespace validator in XText [message #1806960 is a reply to message #1806959]

Mon, 20 May 2019 06:15

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

in xtext there is not a AST only but a parse tree too.
this is mapped to the so called node model
which contains the hidden tokens as well.

the class NodeModelUtils might be a good entry point to start and research

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

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