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how can i create a rule containing regular expression? [message #1801094]

Sun, 13 January 2019 16:00

kimi raikonnan

Messages: 145
Registered: June 2015

Senior Member

how can i create a rule containing regular expression?
example :

start :
a = b;
cc =dd;
end:

i dont care about what is enclosed between start and end statement, i just need to skip anything enclosed between them without reporting errors.

how to write a rule fulfill this purpose?

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Re: how can i create a rule containing regular expression? [message #1801112 is a reply to message #1801094]

Mon, 14 January 2019 07:21

Uli Merkel

Messages: 246
Registered: June 2013

Senior Member

Have a look how the multiline comment is specified in TERMINALS

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Re: how can i create a rule containing regular expression? [message #1801242 is a reply to message #1801112]

Tue, 15 January 2019 17:55

kimi raikonnan

Messages: 145
Registered: June 2015

Senior Member

I have tried something like that but it does not work.

typeMain returns XTTypeMain:
m += 'typeis' -> 'endtype'
;

typeis
askdjhaskjdhkajs // I need no errors here
endtype

I found that is produce syntax errors everywhere.
Is there is something i am missing?
Is this requirement is feasible in XTEXT as its mandatory in my case?
Also i need object of XTTypeMain to be created
Thanks

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Re: how can i create a rule containing regular expression? [message #1801243 is a reply to message #1801242]

Tue, 15 January 2019 18:17

Christian Dietrich

Messages: 13271
Registered: July 2009

Senior Member

where is your terminal rule?

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/xtext/
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

[Updated on: Tue, 15 January 2019 18:21]

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Re: how can i create a rule containing regular expression? [message #1801244 is a reply to message #1801243]

Tue, 15 January 2019 18:20

kimi raikonnan

Messages: 145
Registered: June 2015

Senior Member

what do you mean by -----?

[Updated on: Tue, 15 January 2019 18:20]

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Re: how can i create a rule containing regular expression? [message #1801245 is a reply to message #1801244]

Tue, 15 January 2019 18:21

Christian Dietrich

Messages: 13271
Registered: July 2009

Senior Member

where is your terminal rule?

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/xtext/
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: how can i create a rule containing regular expression? [message #1801246 is a reply to message #1801245]

Tue, 15 January 2019 18:35

kimi raikonnan

Messages: 145
Registered: June 2015

Senior Member

terminal INTEGER :
DIGIT | DIGIT ('_'? DIGIT)+
;

terminal fragment DIGIT:
'0'..'9'
;

Those are the terminals i have in my grammar
Also i have this terminal for comments

terminal ML_COMMENT:
'/*' -> '*/'
;

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