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Macro's [message #645307]

Thu, 16 December 2010 14:56

No real name

Messages: 25
Registered: April 2010

Junior Member

Hey,

I got quite far with my grammar, but now I am wondering if its possible to implement in Xtext something which resembles a macro. What I have in mind is:

DefineMacro:
    '#define' name=ID value=XXX

XXX should be some magic which states that it is everything until the end of line. Is something like this possible or would the lexer come into the way? I thought about doing it as a terminal, but that doesnt make much sense to me as it wont allow for any flexibility in whitespaces

[Updated on: Thu, 16 December 2010 15:06]

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Re: Macro's [message #645434 is a reply to message #645307]

Fri, 17 December 2010 09:21

Alexander Nittka

Messages: 1193
Registered: July 2009

Senior Member

Hi,

The following snippet should give you an idea

DefineMacro hidden():
'#define' name=ID value=(ID|INT|WS|STRING|listOfAnyKeywordAllowedHere)* NL;

terminal NL: "\r?\n";

Note that the NL definition overlaps with the WS definition. Some more modifications might be necessary (in particular making NL hidden by default). You may also run into problems if a macro definition is allowed to be in the last line of your model file (right now a new line is mandatory after the definition).

Alex

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Re: Macro's [message #645517 is a reply to message #645434]

Fri, 17 December 2010 15:18

No real name

Messages: 25
Registered: April 2010

Junior Member

thanks for the tip. Right now I am wondering if there is an inbuilt production rule or expression which would say "any keyword", so that I dont have to maintain the listOdKeywords manually.

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