pigpen.ts

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import { BaseCipher } from "../base/baseCipher";
 
export class PigpenCipher extends BaseCipher {
    readonly CipherName = "Pigpen";
 
    private map: Record<string, string> = {};
 
    private inv: Record<string, string> = {};
 
    constructor() {
        super();
 
        // define simple textual mapping for Pigpen (non-graphical)
        const symbols = [
            '!', '"', '#', '$', '%', '&', '\'', '(', ')', '*', '+', ',', '-', '.', '/',
            ':', ';', '<', '=', '>', '?', '@', '[', ']', '^', '_'
        ];
 
        for (let i = 0; i < 26; i++) {
            this.map[PigpenCipher.ALPHABET[i]] = symbols[i];
            this.inv[symbols[i]] = PigpenCipher.ALPHABET[i];
        }
    }
 
    encode(plainText: string = ""): string {
        return plainText
            .split('')
            .map(c => this.map[c.toUpperCase()] ?? c)
            .join('');
    }
 
    decode(cipherText: string = ""): string {
        return cipherText
            .split('')
            .map(c => this.inv[c] ?? c)
            .join('');
    }
}