Author: Fabien Letouzey
Date: 01:09:08 02/21/05
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On February 20, 2005 at 10:14:48, Mathieu Pagé wrote: >Hi, > >I'm currently implementing a pgn parser. I think it is quite dificult to >implement (efficiently) a parser for the PGN import format that require barely >no consistencies. > >As an example it allow for two tag to be on the same line or to one tag to be >spaned on multiple line. > >An implementation of a parser for this kind of tag will be way less efficient >than one reading a tag wich comply with the export format (One tag per line, one >line per tag). > >So, here is the question. Those of you who have already implemented a pgn >parser, did you implement the import format, or just the export one? Or maybe a >mix of them ? in the later case I would appreciate to have an overview a what >you implemented and what you did not. > >Mathieu P. A scanner (separate lexical analysis transforming input characters into tokens/"words") will take care of these problems. I would say it's not much more work than assuming export format, only a couple of extra hours. However if your program is already scattered with single-character reads, you might lose more time. If your tool is destined for other people, I would suggest you implement the input format. Otherwise, tools such as pgn-extract will clean up PGN files the way you want, including fixing errors like non-SAN-conforming moves. Fabien.
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