static WoodyRule findWoodyRuleInSource(S src, S ruleName) {
  L<S> lines = lines(src);
  for i, S s over lines: {
    L<S> tok = javaTok(s);
    if (jfind(tok, "RULE " + ruleName) >= 0) {
      new WoodyRule rule;
      rule.nameInFile = ruleName;
      rule.lineInFile = i;
      
      Explain e = explain(s, ctxParsingRules(), "rule");
      if (e == null)
        fail("Bad rule: " + s);
      rule.condition = e.sub(1).str();
      int opening = indexOfTrim(lines, "{", i);
      if (opening >= 0) {
        int closing = indexOfTrim(lines, "}", opening+1);
        rule.body = lines(subList(lines, opening+1, closing));
      }
      ret rule;
    }
  }
  null;
}