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//packageName wikify
//mainClassName Wikify

sclass Wikify {
  volatile Indexed indexed;
  S indexing;
  Q q = startQ();
  int slowSearches;
  
  sclass Indexed {
    S text;
    LCSearcher_v4_multiFile searcher;
  }
  
  int anyIndexOf(S fullText, S pattern) {
    if (empty(fullText)) ret -1;
    Indexed _indexed = indexed;
    if (_indexed != null && fullText == _indexed.text)
      ret _indexed.searcher.singleFileAnyIndexOf(pattern);
      
    // possibly index, do slow search
    possiblyIndexText(fullText);
    ++slowSearches;
    ret main indexOf(fullText, pattern);
  }
  
  synchronized void possiblyIndexText(S text) {
    if (indexing != null) ret;
    indexing = text;
    q.add(r {
      try {
        new Indexed i;
        i.text = text;
        i.searcher = wikifyString(text);
        setIndexed(i);
      } finally {
        indexing = null;
      }
    });
  }
  
  synchronized void setIndexed(Indexed i) {
    indexed = i;
  }
}