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!7

cprint SnippetsDoubleWordIndex {
  transient DoubleWordIndex<S> wordIndex; // word to snippet ID

  start-thread {
    time "Make double word index" {
      new WordIndex<S> wordIndex;
      for (virtual CSnippet sn : dm_allSnippets()) {
        S snippetID = (S) rcall snippetID(sn);
        S text = cast rcall text(sn);
        wordIndex.add(snippetID, text);
      }
      setField(+wordIndex);
    }
    print("Indexed " + nWords(wordIndex.numWords()));
  }
  
  // API
  
  // may return null (no pre-search result)
  Cl<S> snippetsContainingTextIC_preSearch(S query) {
    ret doubleWordIndex_lookupString(wordIndex, query);
  }
}