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persistable sclass G22NetworkElement > MetaWithChangeListeners {
  // network element belongs to
  settable G22Network network;
  
  // position in visual representation
  settable Rect bounds;
  
  // identifier in network (optional)
  settableWithVar S identifier;
  
  // script code to adapt element and to create instance
  settableWithVar S code;
  
  {
    onChange(-> { network?.change(); });
  }
  
  class Port extends MetaWithChangeListeners {
    // position on element's border (0 to 1, 0 to 1)
    settableWithVar DoublePt position;
    
    // name of port within element
    settableWithVar S name;
    
    // cable attached to this port (optional)
    settableWithVar G22NetworkCable cable;
    
    // is it output or input?
    settableWithVar bool isOutput;
    
    // type of object sent through port
    settableWithVar Class dataType;
    
    G22NetworkElement element() { ret G22NetworkElement.this; }
    
    toString { ret renderVars("Port", +name, +isOutput); }
    
    Rect bounds() {
      int size = 10;
      Rect r = element().bounds;
      if (r == null) null;
      r = growRectTopAndLeft(r, size);
      ret rect(r.x+iround(position.x*r.w),
        r.y+iround(position.y*r.h),
        size, size);
    }
  }
  
  L<Port> ports = syncL();
  
  LASCompileResult newCompileResult() { ret new LASCompileResult; }
  
  transient LASCompileResult compileResult;
  LASCompileResult compile(G22Utils g22utils) {
    S code = this.code;
    if (code == null) null;
    var cr = compileResult;
    if (cr != null && eq(cr.script, code)) ret cr;
    cr = newCompileResult();
    var parser = g22utils.leftArrowParser();
    configureParser(parser);
    cr.script(code).parser(parser).compile();
    ret compileResult = cr;
  }
  
  void configureParser(GazelleV_LeftArrowScriptParser parser) {
    parser.addVar("blueprint");
  }
  
  O makeInstance(G22Utils g22utils) null on exception {
    var compiled = compile(g22utils);
    if (compiled == null) null;
    var compiled2 = compiled!;
    if (!compiled.runnable()) null;
    new FlexibleVarContext ctx;
    ctx.put("blueprint", this);
    ret compiled2.get(ctx);
  }
  
  toString { ret or2(identifier(), "Unnamed element"); }
  
  Port getPort(S name) {
    ret firstThat(ports, p -> eq(p.name, name));
  }
  
  void addPort aka addSlot(S name, DoublePt etc position) {
    printFunctionCall("addPort", +name, +position);
    Port p = getPort(name);
    if (p != null) ret;
    ports.add(new Port().name(name).position(position));
    change();
  }
  
  void addInputPort(S name, DoublePt etc position, Class type) {
    Port p = getPort(name);
    if (p != null) ret;
    ports.add(new Port().name(name).position(position)
      .isOutput(false).dataType(type));
    change();
  }
  
  void addOutputPort(S name, DoublePt etc position, Class type) {
    Port p = getPort(name);
    if (p != null) ret;
    p = new Port().name(name).position(position)
      .isOutput(true).dataType(type);
    ports.add(p);
    print("Made port " + p);
    change();
  }
  
  void removePorts aka deletePorts aka removeSlots aka deleteSlots() {
    ports.clear();
    change();
  }
  
  L<Port> ports() { ret cloneList(ports); }
}