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!7

cmodule TopDownParsing > DynSCP {
  S input = "Bob paid for Charlie 's college education";
  TryPatterns root;
  
  // Tree has 2 types of nodes: composite and options
  
  class Base {
    L<Base> children;
    
    L<Base> children() { ret children; }
  }
  
  class AppliedPattern > Base {
    S pattern;
    LS arguments;
    
    L<Base> children() {
      if (children == null)
        children = map(arguments, a -> new TryPatterns(a));
      ret children;
    }

    toString { ret stdToStringWithFields(this, 'pattern, 'arguments); }
  }
  
  class TryPatterns > Base {
    S input;
    
    *() {}
    *(S *input) {}
    
    L<Base> children() {
      if (children == null) {
        children = new L;
        for (S pat : patterns())
          for (LS arguments : matchesToStringLists(flexMatchIC_all(pat, input)))
            children.add(setAll(new AppliedPattern, pattern := pat, +arguments));
      }
      ret children;
    }

    toString { ret stdToStringWithFields(this, 'input); }
  }
  
  start-thread {
    setField(root := parse(input));
    setComponent(jDynamicTree(root, x -> x.children()));
  }
  
  LS patterns() { ret dm_getUnclearList("patterns"); }
  
  TryPatterns parse(S s) {
    ret new TryPatterns(s);
  }
}