[antlr-interest] to recognise interger and real in one rule

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In lexer grammar, I try to recognise interger and real in one rule, 

BasicValue: ( Sign)? (Digit)+ {$setType(IntDenot);} ( '.' (Digit)+ (Exponent)?
{$setType(RealDenot);})? ;

protected Exponent : 'E' (Sign)? (Digit)+ ;


In parser grammar, put

basicValue :BaiscValue EOF;

when parsing  "78.9", produces error message: 

line 1:2: expecting "BaiscValue", found '78.9'.

Further more I wish, with action {$setType(IntDenot);} and {$setType(RealDenot);} in lexical
grammar, the token type BasicValue is redundant. 

Robert



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