[antlr-interest] ambiguous grammar
beeh1973 <hastur4711 at bigfoot.com>
hastur4711 at bigfoot.com
Sat Jan 18 13:49:19 PST 2003
hi,
in my language i have float literals like .1 and
expressions like $.1
i am using the following lexer rule to recognize numbers
NUMBER
: '.' { _ttype = DOT; } // a single dot
(((DIGIT)+ { _ttype = FLOAT} ) // a float number
((EXPONENT))?)?
|
// some more cases for integers and floats > 1
...
DOLLAR : '$' ;
in the parser i try to match $.1 with this rule:
component:
DOLLAR^ DOT NUMBER
;
while parsing $.1 i get an error that FLOAT is unexpected at that
point.
while i understand why this is happening; a call to nextToken simply
returns the next token which is a FLOAT no DOT, i do not understand
how to
fix the grammar. can anybody help me with this?
thanks in advance,
alphonse bendt
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