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Re: NTL and C4251 [message #2794 is a reply to message #2792]

Tue, 25 April 2006 15:19

jmansion is currently offline

jmansion
Messages: 15
Registered: April 2006
Location: London

Promising Member

>OK, I believe that it can save some time as long
>as you have description ready before starting the job...

You must type a lot faster than I do then. I think its actually most handy when evolving the grammar. I like to write the grammar, and then write some candidate inputs and see if they feel right, for the things I want to express. And then change things around a bit and try again.

Having that sort of tool makes it easy - I don't add the AST code and semantic actions until I'm happy with the structure, and there's no way I could iterate that fast even using Java or C# with a hand-written parser, let alone C++.

I can't believe that anyone would argue that parser creation isn't a whole lot faster with a good generator tool, particularly if you care about whether your off-the-cuff implementation actually handles an ambiguous grammar in a particular way through accident - I'd rather have a formal grammar specification and a tool that can warn me of ambiguities. Not least, it also makes it easier to create alternate implementations in other languages.

Its certainly the case that a hand-written parser can be faster and have better diagnostics support, if you work hard enough at it.

James

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[Message index]

		NTL and C4251 By: jmansion on Mon, 24 April 2006 14:26
		Re: NTL and C4251 By: mirek on Mon, 24 April 2006 15:26
		Re: NTL and C4251 By: jmansion on Mon, 24 April 2006 15:34
		Re: NTL and C4251 By: unodgs on Mon, 24 April 2006 19:29
		Re: NTL and C4251 By: mirek on Mon, 24 April 2006 21:29
		Re: NTL and C4251 By: unodgs on Mon, 24 April 2006 22:44
		Re: NTL and C4251 By: mirek on Mon, 24 April 2006 22:49
		Re: NTL and C4251 By: jmansion on Tue, 25 April 2006 10:23
		Re: NTL and C4251 By: mirek on Tue, 25 April 2006 10:45
		Re: NTL and C4251 By: unodgs on Tue, 25 April 2006 13:54
		Re: NTL and C4251 By: jmansion on Tue, 25 April 2006 14:07
		Re: NTL and C4251 By: mirek on Tue, 25 April 2006 14:20
		Re: NTL and C4251 By: jmansion on Tue, 25 April 2006 14:33
		Re: NTL and C4251 By: mirek on Tue, 25 April 2006 15:03
		Re: NTL and C4251 By: jmansion on Tue, 25 April 2006 15:19
		Re: NTL and C4251 By: unodgs on Tue, 25 April 2006 15:43
		Re: NTL and C4251 By: jmansion on Tue, 25 April 2006 16:06
		Re: NTL and C4251 By: mirek on Tue, 25 April 2006 20:10
		Re: NTL and C4251 By: jmansion on Wed, 26 April 2006 10:02
		Re: NTL and C4251 By: mirek on Wed, 26 April 2006 10:10
		Re: NTL and C4251 By: jmansion on Tue, 25 April 2006 10:17
		Re: NTL and C4251 By: jmansion on Mon, 24 April 2006 16:04
		Re: NTL and C4251 By: mirek on Mon, 24 April 2006 16:27
		Re: NTL and C4251 By: gprentice on Tue, 25 April 2006 06:41
		Re: NTL and C4251 By: mirek on Tue, 25 April 2006 09:45
		Re: NTL and C4251 By: gprentice on Tue, 25 April 2006 10:24
		Re: NTL and C4251 By: mirek on Tue, 25 April 2006 10:41
		Re: NTL and C4251 By: jmansion on Tue, 25 April 2006 10:26

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