Author: Mathieu Pagé
Date: 05:49:35 02/21/05
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On February 21, 2005 at 04:09:08, Fabien Letouzey wrote: >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. Thanks for the input. I'll write what you called a scanner, in order to separate the movetext block into tokens as they are defined by the pgn format. I found it funny to read this in the introduction of the standard : "PGN is structured for easy reading and writing by human users and for easy parsing and generation by computer programs." Can someone explain me wich feature of the pgn standard is meant to be easy to parse ?
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