Parse a game, saving the comments as hash of list (see above), and then check for comments that are of 'RAV' type. Chess::PGN::Parse does not directly support recursive parsing of games, but it makes it possible. One of the things you can do with these sequences is to parse them again and get bare moves that you can feed to a chess engine or a move analyzer (Chess::PGN::EPD by H.S.Myers is one of them). This module can recognize RAV sequences and store them as comments. PGN games may include RAV (Recursive Annotated Variations) which is just game text inside parentheses. If you need to preserve the original game text after parsing, either copy it before calling quick_parse_game() or use parse_game() instead. This is an intended feature, to privilege speed. About game(), it's worth mentioning that, using quick_parse_game(), the game text is stripped of all non moves elements. More methods give access to some commonly used elements: game() is the unparsed text, moves() returns an array of parsed moves, without move numbers, comments() and errors() return the relative structures after parsing. The standard tags have their direct access method (white, black, site, event, date, result, round). Getting the parsed valuesĪt the end of the exercise, you can access the components through some standard methods. Anything that the parser cannot actively classify as 'known' will be stored as error. Not a move, or a move number, or a comment, either text or recursive. What are errors? Just anything that is not recognized as any of the previous elements. All errors for one given move are just a string). Passing the option will save the errors into a structure similar to the comments (no options on the format, though. If the comments and the recursive variations (RAV) are valuable to you, you can use the parse_game() method, which will strip the excess text, but it can store it into an appropriate data structure. This process can be accomplished in two ways: using quick_parse_game(), the non moves elements are just stripped off and discarded, leaving an array of bare moves. What is it? Parsing is the process of identifying and isolating the moves from the rest of the game text, such as comments and recursive variations. If you know that your games don't have any of these problems, you might choose the read_standard_game() method, which is a bit faster.Īfter the reading, you can either use the game text as it is, or you can ask for parsing. Reading a game is accomplished through the read_game() method, which will identify not only the standard game format but also some unorthodox cases, such as games with no separating blank line between tags and moves, games with no blank lines at the end of the moves, leading blank lines, tags spanning over several lines and some minor quibbles. During this phase, the tags are decomposed and stored into an internal hash for future use, while the game text is left untouched. The reading will only identify the two components of a game, i.e. Parsing PGN games is actually two actions: reading and parsing. In the current PGN file and return an array of hashes with all the Read_all(), quick_read_all(), smart_read_all() will read all the records Will call parse_game() or quick_parse_game(), depending on the Smart_parse_game() Best of the above methods. Should be the preferred method when we know that we are Quick_parse_game() Same as the above, but doesn't save the comments, It can deal with nested comments and recursive parse_game() parse the current game, and stores the moves into anĪrray and optionally saves the comments into an array of hashesįor furter usage. While dealing with simple braced comments is straightforward, parsing nested comments can give you more than a headache.Ĭhess::PGN::Parse most immediate methods are: read_game() reads one game, separating the tags and the game text. A string of numbered chess moves, optionally interrupted by braced comments and recursive parenthesized variants and comments. This module offers a clean handle toward reading and parsing complex PGN files.Ī PGN file has several tags, which are key/values pairs at the header of each game, in the format Īfter the header, the game follows. However, dealing with some of the intricacies of the Standard is less than trivial. Parsing simple PGN files is not difficult. Being a public, well established standard, PGN is understood by many chess archive programs. It is among the preferred means of chess games distribution. PGN files contain chess games produced by chess programs following a standard format (). My = $pgn->smart_read_all() DESCRIPTIONĬhess::PGN::Parse offers a range of methods to read and manipulate Portable Game Notation files. My $pgn = new Chess::PGN::Parse undef, $text Chess::PGN::Parse - reads and parses PGN (Portable Game Notation) Chess files SYNOPSIS use Chess::PGN::Parse
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