Re: Parsing Expression Grammar

"Paul Mann" <paul@parsetec.com>
22 Sep 2005 23:52:29 -0400

          From comp.compilers
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Re: Parsing Expression Grammar cleos@nb.sympatico.ca (Cleo Saulnier) (2005-09-22)
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From: "Paul Mann" <paul@parsetec.com>
Newsgroups: comp.compilers
Date: 22 Sep 2005 23:52:29 -0400
Organization: Compilers Central
Keywords: parse
Posted-Date: 22 Sep 2005 23:52:29 EDT

>> the grammar contortions that are often needed tend to be very ugly.
>> From the two LL parser generators that I wrote, this is what
>> annoyed me the most.
>
> I guess with "contortions" you mean the result of factorizing
> tokens out, to make a grammar LL(1) conform. For compiler generators with
> look ahead capabilities as ANTLR, Coco/R or the TextTransformer, this
> isn't necessary any more.


So now you have another kind of contortion, infinite look-ahead.
Replace one contortion with another for the sake of using LL? Just
proves it is flawed from the start.




Paul Mann
http://parsetec.com


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