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

Sun, 13 January 2019 11:00

Eclipse User

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?

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

Mon, 14 January 2019 02:21

Eclipse User

Have a look how the multiline comment is specified in TERMINALS

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

Tue, 15 January 2019 12:55

Eclipse User

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

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

Tue, 15 January 2019 13:17

Eclipse User

where is your terminal rule?

[Updated on: Tue, 15 January 2019 13:21] by Moderator

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

Tue, 15 January 2019 13:20

Eclipse User

what do you mean by -----?

[Updated on: Tue, 15 January 2019 13:20] by Moderator

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

Tue, 15 January 2019 13:21

Eclipse User

where is your terminal rule?

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

Tue, 15 January 2019 13:35

Eclipse User

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:
'/*' -> '*/'
;

Re: how can i create a rule containing regular expression? [message #1801247 is a reply to message #1801246]

Tue, 15 January 2019 13:43

Eclipse User

-> is in terminal . In parse rules it is a predicate

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