rot13-leetify

rot13_leetify.d

module rot13_leetify;

import std.stdio;
import std.algorithm:map,filter;



char rot13(char c) pure {
	switch(c) {
		case 'a': .. case 'm':
		case 'A' : .. case 'M':
			c+=13;
			break;
		case 'n' : .. case 'z' :
		case 'N' : .. case 'Z' :
			c-=13;
			break;
			
		default : break;
			
	}
	return c;
}

char leetify(char c) {
	struct LeetStruct {
		uint number;
		char chr;
	}
	
	static immutable LeetStruct[] leetArray = [{4,'a'}, {7,'t'}, {1,'l'}, {3,'e'}, {0,'o'}]; 

	import std.conv;
	import std.array;
	import std.ascii;
	auto filterResult = leetArray.
		filter!(e => e.chr == c.toLower).
			map!(e => to!string(e.number)).array;
	return filterResult ? filterResult[0][0] : c;
}

char rot13(dchar c) pure {
	return rot13(cast(char)c);
}


void main(string[] args)
{
	import std.array;
	writeln("TDPL".map!(c => leetify(cast(char) c)));
	writeln(map!rot13("Uryyb Jbeyq!")
		.filter!(l => l !='H')
		.map!(l => leetify(cast(char)l)));
	
	// Lets the user press <Return> before program returns
	stdin.readln();
}