[antlr-interest] Lexer rule problem - ANTLR 2.7.7

clive.i.hill at jpmorgan.com clive.i.hill at jpmorgan.com
Thu Jan 31 08:36:13 PST 2008


Hi,

I have a lexer rule that is meant to match a range of integers or numbers 
in the following style format:

5800:6000
or
1.8:2.0

The lexer rule I have for this is given by:

protected
RANGE 
    : (INT | FLOAT) COLON (INT | FLOAT)
    ;

where INT,FLOAT, DIGIT, DOT and COLON are given at the end of this email.


When I run my parser against the grammar file (attached) with the 
following string:

"ftse dec 5800:6000 c"

I get the following exception:


antlr.TokenStreamRecognitionException: expecting '.', found ':'

This is because the lexer is attempting to parse a RANGE token correctly, 
but is expecting a FLOAT.  My RANGE lexer rule,, it seems to me, should 
check for an INT or  a FLOAT.

This rule seems very uncomplicated, so I can't tell why it is going wrong. 
 Can anyone provide any suggestions?


Thanks in advance,

Clive




protected
FLOAT 
    : DOT INT
    | INT DOT (DIGIT)*
    ;

protected
INT 
    : (DIGIT)+ 
    ;

protected
DIGIT 
    : '0' .. '9'
    ;

COLON
        : ':'
        ;

protected
DOT 
    : '.'
    ;




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