Re: top-down and bottom-up

Joachim Durchholz <joachim_d@gmx.de>
15 Apr 2003 00:15:25 -0400

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Related articles
top-down and bottom-up rjdepauw@xs4all.nl (Rob) (2003-04-13)
Re: top-down and bottom-up joachim_d@gmx.de (Joachim Durchholz) (2003-04-15)
Re: top-down and bottom-up haberg@matematik.su.se (2003-04-20)
Re: top-down and bottom-up JeffKenton@attbi.com (Jeff Kenton) (2003-04-20)
Re: top-down and bottom-up thp@cs.ucr.edu (2003-05-06)
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From: Joachim Durchholz <joachim_d@gmx.de>
Newsgroups: comp.compilers
Date: 15 Apr 2003 00:15:25 -0400
Organization: Compilers Central
References: 03-04-039
Keywords: parse
Posted-Date: 15 Apr 2003 00:15:24 EDT

Rob wrote:
> I would like to know if a parse tree created by a top-down parser
> differs from a parse tree created by a bottom-up parser given that the
> grammar is the same.


The parse tree is the same if the grammar is the same. In practice,
this means that you will indeed get different parse trees: in most
cases, the language grammar must be adapted to be useful for a given
parser generator, so every parser uses a different grammar (hopefully
denoting the same language).


HTH
Joachim
--
Currently looking for a new job.

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