PGNP: PGN Parser

PGNP is a Portable Game Notation (PGN) parser. More details about the PGN specification can be found here.

Features

• Basic PGN parsing (tags, move, comments, variations, NAG, etc.)
• Parse PGN files that contains multiple games
• Handle very large files: up to 2^(sizeof(unsigned long long)*8) bytes
• Efficiency:

# cpu: Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz
# file name: lichess_db_standard_rated_2017-06.pgn
# file sha1sum: af8e01ab9709950be1804880d22d094324df5338
# file source: https://database.lichess.org/#standard_games
# file number of games: 11512600
# file size: 24.6GB
# pgnp FILE_BUFFER_SIZE: (1024 * 1024 / 2)

> User time (seconds): 599.81
> System time (seconds): 2.72
> Percent of CPU this job got: 99%
> Elapsed (wall clock) time (h:mm:ss or m:ss): 10:03.17
> Average shared text size (kbytes): 0
> Average unshared data size (kbytes): 0
> Average stack size (kbytes): 0
> Average total size (kbytes): 0
> Maximum resident set size (kbytes): 4484
> Average resident set size (kbytes): 0
> Major (requiring I/O) page faults: 0
> Minor (reclaiming a frame) page faults: 784
> Voluntary context switches: 4
> Involuntary context switches: 6649
> Swaps: 0
> File system inputs: 0
> File system outputs: 0
> Socket messages sent: 0
> Socket messages received: 0
> Signals delivered: 0
> Page size (bytes): 4096
> Exit status: 0

How to use it ?

PGNP can be used as a shared library in your project. You only need to include pgnp.hpp and linking the .so file to your executable.

Example

Somewhere at the beginning of the file:

#include "pgnp.hpp"

Load PGN from file/string:

pgnp::PGN pgn;
try {
    pgn.FromFile("pgn.txt"); // Or pgn.FromString("YOUR PGN CONTENT HERE");
    pgn.ParseNextGame();
}
catch(...){
    // Handle exceptions
}

Various API calls:

bool hasRound=pgn.HasTag("Round"); // Check if a tag exists
try {
    pgn.STRCheck(); // Perform a Seven Tag Roster check
}
catch(...){
    // Handle exceptions
}
std::vector<std::string> tags=pgn.GetTagList(); // Get the list of tags in current game
std::string tagValue=GetTagValue("Date"); // Get the value of a tag in current game

Access to moves:

pgnp::HalfMove *moves=new pgnp::HalfMove();
pgn.GetMoves(moves); // Get the tree of half moves
int length=moves->GetLength(); // Get the number of half move in the current MainLine
// Public members:
// moves->variations contains variations of the current move
// moves->isBlack boolean that says if current half move is for the black side
// Check pgnp.hpp for more infos for the other fields (comments, count, etc.)

CMake Integration

By using the add_subdirectory() directive on this repository, you will be able to use the following cmake calls in your project:

include_directories(${PGNP_INCLUDE_DIR})
target_link_libraries(<YOUR_TARGET> pgnp)