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Include C++ blocks in Xtext [message #1838525]

Sat, 27 February 2021 14:46

John Doe

Messages: 138
Registered: October 2020

Senior Member

Hi all,

I am writing an xtext grammar but i have the following issue:

I want to be able to also add C++ blocks as follows:

... when [x==3] then {x++}

where when, then and the brackets are Xtext keywords while x==3 and x++ is C++ code.

Anyone knows how to include these C++ blocks in Xtext?

Thanks,
John

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Re: Include C++ blocks in Xtext [message #1838531 is a reply to message #1838525]

Sun, 28 February 2021 03:02

Karsten Thoms

Messages: 747
Registered: July 2009
Location: Dortmund, Germany

Senior Member

Embedding a language in Xtext is not trivial to not possible. I assume you want the variables (here: x) you are defining in the DSL to be referenced in C++ code. This can't be done easily. The easiest way to embed the C++ code is "as is", i.e. you define the block from { to } to be consumed by the lexer with a single token. This would be done with a terminal rule. You could pass the token to a custom C++ lexer/parser. This is again an advanced topic. "Xtext Custom Lexer" would be the term to google for.

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