On 11/08/2011 16:15, [email protected] wrote:
Hi Luis,my Maya colleague next door believes that "-3456781203" refers to a date in December instead of May. Could he be right? Given the fixed format of your date strings, the question is not really whether you can scan it with Ragel (or flex, or what else), but whether such a tool is the right tool to do that. Somehow you always need to extract the last 2+2 chars and validate them, but this essentially makes you going backwards in your machine (or using further memory) which is not within the realm of a "pure" FSM (http://en.wikipedia.org/wiki/Finite_state_machine). However, Ragel allows you to easily add the necessary "counting". It depends on how you get your date strings whether using Ragel is benficial or not. If you have just isolated strings (i.e. the entire string, so you know where it ends) it probably doesn't. If you need to extract the date from a stream of other tokens that can easily described by a FSM, then it will. jg _______________________________________________ ragel-users mailing list [email protected] http://www.complang.org/mailman/listinfo/ragel-users
Hi jg, of course your Maya colleague is of course right. The reason why I liketo be able to do the parsing with ragel is, that all other things I have are perfectly fine working and I'm really happy with it. The only thing remaining are this 'ugly' date strings with arbitrary number of years ... As it is nice to use a single tool for a set of 'equal' kind of things, it would be nice to be able to do it. And it'll be only part
of a stream ...
Luis
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Luis Kornblueh Tel. : +49-40-41173289
Max-Planck-Institute for Meteorology Fax. : +49-40-41173298
Bundesstr. 53
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Federal Republic of Germany
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