chess-pgn-parser/src/app.js

PGN to JSON in seconds

import {
    getCommentary,
    getNags,
    getStrAndStringifyMoves,
    removeEscapeMechanism
} from "./helpers";

export function pgn2json(pgnText) {
    var pgn = pgnText.split('\n');
    var game = {
        str: {},
        moves: [],
        annotations: [],
        nag: []
    }
    var moves, moveClone, movPos = [];

    pgn.forEach((_, i, pgn) => pgn[i] = pgn[i].trim().replace('\r', ''));
    pgn = removeEscapeMechanism(pgn);
    [game.str, moves] = getStrAndStringifyMoves(pgn);
    moveClone = moves.join('').split(' ');
    for (let i = 1; moveClone.includes(`${i}.`); i++) {
        movPos.push(moveClone.indexOf(`${i}.`));
    }

    game.nag = getNags(moveClone, movPos);
    game.annotations = getCommentary(moves, moveClone, movPos);

    moves = moves.join('').split(' ');
    moves = moves.filter(val => !val.includes('.') && !val.includes('$'));
    moves.pop();
    game.moves = moves;
    return JSON.stringify(game, null, 4);
}