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Parsing of language fragments [message #1742999]

Fri, 09 September 2016 08:58

Klaus Schulz

Messages: 2
Registered: September 2016

Junior Member

For better Unit testing of my language, I want to test every rule separately.

However, the ParseHelper can only parse input that fully corresponds to the defined grammar.

Consider a language like HTML. I want to test parsing paragraphs <p> without having to nest them in <html><head><body> etc.

I think ANTLR offers similar possibilities.

Is this achievable in Xtext too?

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Re: Parsing of language fragments [message #1743045 is a reply to message #1742999]

Fri, 09 September 2016 20:25

Christian Dietrich

Messages: 13879
Registered: July 2009

Senior Member

hmm sounds like https://github.com/eclipse/xtext-core/issues/16

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Re: Parsing of language fragments [message #1743050 is a reply to message #1743045]

Sat, 10 September 2016 01:17

Eric Salemi

Messages: 35
Registered: September 2016
Location: Belgium

Member

I think I just bumped into that issue. If I inject extension with ParserHelper<T> where T is a rule/type which is not the root of my model, then the ParseHelper.parse() method returns a null pointer. Is this a problem of the ParserHelper class or a general XText problem? Can we achieve this in another way?

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