Getting rid of backups in flex.

robertminsk@yahoo.com (Robert Minsk)
17 Jan 2002 00:31:48 -0500

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Getting rid of backups in flex. robertminsk@yahoo.com (2002-01-17)
Re: Getting rid of backups in flex. esmond.pitt@bigpond.com (Esmond Pitt) (2002-01-18)
Re: Getting rid of backups in flex. casse@netcourrier.com (=?ISO-8859-15?q?=22Cass=E9=.Hugues@free.fr,@free.f) (2002-02-06)
Re: Getting rid of backups in flex. dube@dino04.iro.umontreal.ca (Danny Dube) (2002-02-16)
Re: Getting rid of backups in flex. esmond.pitt@bigpond.com (Esmond Pitt) (2002-02-28)
Re: Getting rid of backups in flex. clint@0lsen.net (2002-03-17)
Re: Getting rid of backups in flex. fjh@cs.mu.OZ.AU (2002-03-19)
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From: robertminsk@yahoo.com (Robert Minsk)
Newsgroups: comp.compilers
Date: 17 Jan 2002 00:31:48 -0500
Organization: http://groups.google.com/
Keywords: lex, question
Posted-Date: 17 Jan 2002 00:31:48 EST

Given the following rules I am still getting 1 backup I'm trying to
get rid of.


DIGIT [[:digit:]]
EXP [Ee][+-]?{DIGIT}+
EXPERR [Ee][+-]?
%%
[-+]?{DIGIT}+ { return tInt; }


[-+]?{DIGIT}*"."{DIGIT}+{EXP}? |
[-+]?{DIGIT}+"."{DIGIT}*{EXP}? |
[-+]?{DIGIT}+{EXP} { return tFloat }


[-+]?{DIGIT}*"."{DIGIT}+{EXPERR}? |
[-+]?{DIGIT}+"."{DIGIT}*{EXPERR}? |
[-+]?{DIGIT}+{EXPERR}
. { return tError }


I get:
State #9 is non-accepting -
  associated rule line numbers:
                7 11
  out-transitions: [ 0-9 ]
  jam-transitions: EOF [ \000-/ :-\377 ]


1 backing up (non-accepting) states.


I have not been able to fix this backup. Can you get rid of the one
backup? Is there a better way to code this?

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