Re: NSScanner question
Re: NSScanner question
- Subject: Re: NSScanner question
- From: Graham Cox <email@hidden>
- Date: Thu, 21 Mar 2013 10:51:05 +1100
On 21/03/2013, at 12:53 AM, Gerd Knops <email@hidden> wrote:
> Can't agree here, I have used NSScanner to parse quite a few even complex file formats, and NSScanner was a pretty convenient (and fast!) solution for these cases.
It's useful, but not as useful as it could be. It *looks* as if it could be used as a tokenizer (lexer) for e.g. a language compiler or interpreter, but if you try it, isn't good for that if any of your tokens are multi-character strings. Which is a pity, because if you have a simpler expression form that does have single-character tokens, it works fine for that. So that makes it look like an arbitrary limitation - why not extend it to operate on multi-character tokens? But I suspect the answer is because that's not really what it was designed for, and it only approaches this type of task.
--Graham
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