@synet/patterns/dist/patterns/commander.js

Robust, battle-tested collection of stable patterns used in Synet packages

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.CommandInvoker = void 0;
/**
 * Manages the execution of commands and keeps track of command history
 */
class CommandInvoker {
    constructor() {
        this.history = [];
    }
    /**
     * Executes a command
     */
    execute(command) {
        command.execute();
        if (this.isUndoable(command)) {
            this.history.push(command);
        }
    }
    /**
     * Undoes the most recently executed command
     * @returns true if a command was undone, false if there was no command to undo
     */
    undo() {
        const command = this.history.pop();
        if (command) {
            command.undo();
            return true;
        }
        return false;
    }
    /**
     * Clears the command history
     */
    clearHistory() {
        this.history = [];
    }
    /**
     * Returns the number of undoable commands in history
     */
    historyLength() {
        return this.history.length;
    }
    /**
     * Type guard to check if a command is undoable
     */
    isUndoable(command) {
        return ("undo" in command &&
            typeof command.undo === "function");
    }
}
exports.CommandInvoker = CommandInvoker;