public static void testRegExpThompson()
{
RegularExpression exp1, exp2, exp3, exp4, exp5, a, b, c, all, why;
a = new RegularExpression("a");
b = new RegularExpression("b");
c = new RegularExpression("c");
//exp 1 (baa)
exp1 = new RegularExpression("baa");
//exp 2 (ac)
exp2 = new RegularExpression("ac");
//exp 4 (baa)+
exp4 = exp1.plus();
//exp 5 (ac)*
exp5 = exp2.star();
//exp 3 (a|b|c)*
exp3 = (a.or(b).or(c)).star();
//all (a|b|c)* (baa)+ (ca)*
all = exp3.dot(exp4.dot(exp5));
why = new RegularExpression("baa").plus().star().plus();
foreach (String o in all.getLanguage(5))
{
Console.Write(o + " ");
}
Automata<String> auto = new Automata<String>();
int num = 0;
why.regexToNDFA(ref num,ref auto);
return;
}
public static RegularExpression generateRandomRegex(char[] alfabet, int depth=5)
{
bool wasmulti = false;
RegularExpression begin = new RegularExpression("a");
for (int c = 0; c < depth; c++) {
int type;
if (wasmulti)
type = r.Next(1, 2);
else
type = r.Next(1, 4);
wasmulti = false;
switch (type) {
case 1: //ONE & DOT
string terminal = "";
for (int i = 0; i < r.Next(1, 5); i++) {
terminal = terminal + alfabet[r.Next(0, alfabet.Count())];
}
begin = begin.dot(new RegularExpression(terminal));
break;
case 2: //ONE & OR
terminal = "";
for (int i = 0; i < r.Next(1, 5); i++) {
terminal = terminal + alfabet[r.Next(0, alfabet.Count())];
}
begin = begin.or(new RegularExpression(terminal));
break;
case 3: //PLUS
begin = begin.plus();
wasmulti = true;
break;
case 4: //STAR
begin = begin.star();
wasmulti = true;
break;
}
}
return begin;
}
