path: root/js/story-interpreter/interpreter.js

const fs = require('fs');


class Room {
    constructor(name, description, items, animals, connections) {
        this.name = name;
        this.description = description;
        this.items = items;
        this.animals = animals;
        this.connections = connections;
    }
}

class Item {
    constructor(name, description, action) {
        this.name = name;
        this.description = description;
        this.action = action;
    }
}

class Animal {
    constructor(name, description, action) {
        this.name = name;
        this.description = description;
        this.action = action;
    }
}

class Interpreter {
    constructor() {
        this.rooms = {};
        this.currentRoom = null;
        this.history = [];
    }

    parseDSLFile(filePath) {
        const dsl = fs.readFileSync(filePath, 'utf8');
        this.parseDSL(dsl);
    }

    parseDSL(dsl) {
        const lines = dsl.split('\n');
        let currentRoom = null;
        let currentItem = null;
        let currentAnimal = null;

        for (const line of lines) {
            const trimmed = line.trim();

            if (trimmed.startsWith('room')) {
                const name = trimmed.split('"')[1];
                currentRoom = new Room(name);
                this.rooms[name] = currentRoom;
            } else if (trimmed.startsWith('description')) {
                const description = trimmed.split('"')[1];
                if (currentItem) {
                    currentItem.description = description;
                } else if (currentAnimal) {
                    currentAnimal.description = description;
                } else {
                    currentRoom.description = description;
                }
            } else if (trimmed.startsWith('item')) {
                const name = trimmed.split('"')[1];
                currentItem = new Item(name);
                currentRoom.items[name] = currentItem;
            } else if (trimmed.startsWith('animal')) {
                const name = trimmed.split('"')[1];
                currentAnimal = new Animal(name);
                currentRoom.animals[name] = currentAnimal;
            } else if (trimmed.startsWith('action')) {
                const action = trimmed.split('"')[1];
                if (currentItem) {
                    currentItem.action = action;
                } else {
                    currentAnimal.action = action;
                }
            } else if (trimmed.startsWith('connection')) {
                const direction = trimmed.split('"')[1];
                const roomName = trimmed.split('"')[3];
                currentRoom.connections[direction] = roomName;
            } 
        }
    }

    interpretCommand(command) {
        const tokens = command.split(' ');
        const action = tokens[0];
        const object = tokens[1];

        if (action === 'go') {
            this.currentRoom = this.rooms[this.currentRoom.connections[object]];
        } else if (action === 'take') {
            if (this.currentRoom.items[object]) {
                console.log(this.currentRoom.items[object].action);
                this.inventory.push(this.currentRoom.items[object]);
                delete this.currentRoom.items[object];
            }
        } else if (action === 'drop') {
            if (this.inventory.includes(object)) {
                this.currentRoom.items[object] = object;
                this.inventory = this.inventory.filter(item => item !== object);
                console.log(`You dropped the ${object}.`);
            }
        } else if (action === 'examine') {
            if (this.currentRoom.items[object]) {
                console.log(this.currentRoom.items[object].description);
            } else if (this.inventory.includes(object)) {
                console.log(object.description);
            } else {
                console.log(`There is no ${object} here to examine.`);
            }
        } else if (this.currentRoom.animals[object]) {
            console.log(this.currentRoom.animals[object].action);
        }

        this.history.push(command);
    }
}

// Create a new interpreter
const interpreter = new Interpreter();

// Parse the DSL file
interpreter.parseDSLFile(process.argv[2]);

// Start a command line interface
const readline = require('readline').createInterface({
    input: process.stdin,
    output: process.stdout
});

readline.on('line', (line) => {
    interpreter.interpretCommand(line);
});