Question

I have a text “ON something blah blah blah could be anything”

I want to match the ON, something, and “blah blah blah could be anything”

I have my tokens as

ON      :   ('O'|'o')('N'|'n');
INDEX: (options {greedy=false;}: ESC | .)*
WS  :
    (   ' '
        |   '\t'
        |   '\r'
        |   '\n'
        )+
        { $channel=HIDDEN; }
        ;  
ESC :
    '\\' ('"'|'\''|'\\')
    ;

and I normally want whitespace to be thrown away so channel is hidden but in this case, I want to match the rest of the string WITH whitespace. how do I do this in a rule? Something like

myRule: ON INDEX REST;

but not sure what REST should be? (and not sure if I need imaginary token or not).

thanks,
Dean

Answer 1

If I correctly understand your issue, so your grammar will be something like this (works correctly for your example):

grammar so1;

myRule: ON INDEX rest;

rest    :   ~('\r'|'\n')*;

ON      :   ('O'|'o')('N'|'n');

INDEX   :   (LETTER | DIGIT)+;

WS  :
(   ' '
    |   '\t'
    |   '\r'
    |   '\n'
    )+
    { $channel=HIDDEN; }
    ;  

fragment DIGIT : '0'..'9' ;
fragment LETTER : ('a'..'z' | 'A'..'Z' | '_');