// usually returns value from 0 to 1 (possibly higher values too depending on pattern)
static double mmo2_scoredMatch(MMOPattern pattern, S s) {
  ret mmo2_scoredMatch(pattern, s, false, false);
}

static double mmo2_scoredMatch(MMOPattern pattern, S s, bool startOfLine, bool endOfLine) {
  ifdef mmo2_scoredMatch_debug
    printFunctionCall mmo2_scoredMatch(pattern, s, startOfLine, endOfLine);
  endifdef
  if (pattern == null) ret 0;
  S s2 = trim(s);
  if (pattern cast MMOPattern.StartOfLine)
    ret mmo2_scoredMatch(pattern.p, s2, true, endOfLine);
  if (pattern cast MMOPattern.EndOfLine)
    ret mmo2_scoredMatch(pattern.p, s2, startOfLine, true);
  if (pattern cast MMOPattern.Phrase)
    ret mmo2_match(pattern, s, startOfLine, endOfLine) ? 1 : 0;
  if (pattern cast MMOPattern.And)
    ret doubleProduct(map(pattern.l, pat -> mmo2_scoredMatch(pat, s2, startOfLine, endOfLine)));
  if (pattern cast MMOPattern.Or)
    ret doubleMax(map(pattern.l, pat -> mmo2_scoredMatch(pat, s2, startOfLine, endOfLine)));
  if (pattern cast MMOPattern.Not)
    ret invertZeroToOne(mmo2_scoredMatch(pattern.p, s2, startOfLine, endOfLine));
  if (pattern cast MMOPattern.Weighted)
    ret mmo2_scoredMatch(pattern.p, s2, startOfLine, endOfLine)*pattern.weight;
  fail("what. " + pattern);
}

static double mmo2_scoredMatch(S pattern, S s) {
  ret mmo2_scoredMatch(mmo2_parsePattern(pattern), s);
}

Began life as a copy of #1028074