AdventOfCode-ts-2023/2/2_common.ts

/**
 * Parse a list of Cube Bag TM games from strings
 * @param {string} games A list of strings describing game results
 * @returns {Game[]} A list of games played
 */
export function ParseGameStrings(games: string[]): Game[] {
    const parsedGames: Game[] = [];

    const gameIDRegex = new RegExp(/Game (\d+)/);
    const resultsRegex = new RegExp(/(\d+) (red|blue|green)/, "g");

    for(const gameString of games) {
        // Split the game string into its two main parts
        const [gamePart, setsPart] = gameString.split(": ");

        // Get the Game ID
        const gameID = gamePart.match(gameIDRegex);

        if (gameID == null) {
            throw new Error(`Failed to parse Game ID\n${gameString}`);
        }

        // Create the parsed game object
        const parsed: Game = {
            ID: Number(gameID[1]),
            Sets: []
        };

        // Split the game's sets into individual units
        const setStrings = setsPart.split(/; /);
        // Loop over each of the sets pulled
        for(const setString of setStrings) {
            // Match any colors and their amounts pulled in the set
            const results = setString.matchAll(resultsRegex);

            if (results == null) {
                throw new Error(`Failed to parse set results\n${setString}`);
            }

            const parsedSet: Set = {
                red: 0,
                green: 0,
                blue: 0
            };

            for (const result of results) {
                const amountPulled = Number(result[1]);
                const colorPulled = result[2];

                parsedSet[colorPulled as keyof Set] = amountPulled;
            }

            // Add the set to the game
            parsed.Sets.push(parsedSet);
        }

        // Add the game to our complete list
        parsedGames.push(parsed);
    }

    return parsedGames;
}

/**
 * A game of Cube Bag TM
 */
export type Game = {
    /**
     * The ID of the game played
     */
    ID: number,
    /**
     * A list of the sets played during the game
     */
    Sets: Set[]
};

/**
 * A single set of cubes pulled in a game of Cube Bag
 */
export type Set = {
    /** The number of red cubes pulled during the set */
    red: number,
    /** The number of green cubes pulled during the set */
    green: number,
    /** The number of blue cubes pulled during the set */
    blue: number,
};