eliminate left recursion

gurukiller@gmx.de (=?ISO-8859-1?Q?Herbert_Fr=F6hlich?=)
28 Jan 2002 01:14:15 -0500

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eliminate left recursion gurukiller@gmx.de (2002-01-28)
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Re: eliminate left recursion jrwyatt@nortelnetworks.com (Robert Wyatt) (2002-02-06)
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From: gurukiller@gmx.de (=?ISO-8859-1?Q?Herbert_Fr=F6hlich?=)
Newsgroups: comp.compilers
Date: 28 Jan 2002 01:14:15 -0500
Organization: http://groups.google.com/
Keywords: parse, question
Posted-Date: 28 Jan 2002 01:14:15 EST

The following grammar G1 is left recursive:


A -> A S.
A -> S.
S -> S "*".
S -> "(" R ")".
S -> "x".


The usual way to eliminate recursions is:


A -> A a.
A -> b.


    |
    v


A -> b A'.
A'-> a A'.
A'-> .




How does it work with G1? There must be solution.


Thanks for every help
Herb

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