pi static method

int pi(int j, String pattern)

Implementation

static int pi(int j, String pattern) {
  if (j == 0) return 0;
  for (var k = 1; k < pattern.length; k++) {
    while (
        pattern[j] != pattern[pi(j - 1, pattern)] && pi(j - 1, pattern) > 0) {
      return pi(pi(j - 1, pattern) - 1, pattern);
    }

    if (pattern[j] == pattern[pi(j - 1, pattern)]) {
      return pi(j - 1, pattern) + 1;
    }
  }

  return 0;
}