java - Is it possible to configure ANTLR grammar to use two token having the same structure? -

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for below grammar,

grammar names;  fullname : title? first_name last_name;  title : 'mr.' | 'ms.' | 'mrs.' ;  first_name : ('a'..'z' | 'a'..'z')+ ;  last_name : ('a'..'z' | 'a'..'z')+ ;  whitespace : ( '\t' | ' ' | '\r' | '\n'| '\u000c' )+ -> skip ;

when parsing input "mr. john smith", throw exception

 mismatched input 'smith' expecting last_name

is possible configure antlr handle case? if not possible, alternative way handle it?

please note it's not limited simple case.

there no syntactic difference between first_name , last_name; need assign them.

grammar names;  fullname : title? first=name last=name;  title : 'mr.' | 'ms.' | 'mrs.' ;  name : ('a'..'z' | 'a'..'z')+ ;  whitespace : ( '\t' | ' ' | '\r' | '\n'| '\u000c' )+ -> skip ;

then can call get("first") , get("last") extract parsed values out of match.


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