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sclass ConvertLASToJava > Meta {
  replace Tk with GazelleV_LeftArrowScript.
  delegate Evaluable to Tk.
  
  O convert(LASClassDef.FieldDef field) {
    ret "/*settable?*/ " + shortClassName(field.type()) + " " + field.name() + ";";
  }
  
  O convert(Tk.FunctionDef f) {
    ret "O " + f.name + "(" + joinWithComma(map(f.args, arg -> "O " + arg)) + ") {\n"
      + indentx(convert(f.body, true))
      + "}\n";
  }
  
  O convertWithLeadingSpace(Evaluable o) {
    ret leadingSpace(o, "") + convert(o);
  }
  
  O convertWithLeadingSpace2(Evaluable o) {
    ret replaceIfEqual(leadingSpace(o, ""), " ", "") + convert(o);
  }
  
  S leadingSpace(Evaluable o, S defaultSpace) {
    S space = null;
    var src = o.tokenRangeWithSrc();
    if (src != null)
      space = src.startPtr().mapIdx(idx -> idx & ~1)!;
    ret or2(space, defaultSpace);
  }
  
  S trailingSpace(Evaluable o, S defaultSpace) {
    S space = null;
    var src = o.tokenRangeWithSrc();
    if (src != null) {
      S rawSpace = src.endPtr().mapIdx(idx -> idx & ~1)!;
      space = replaceRegexp(rawSpace, "\n[ \t]+$", "\n");
      if (scaffoldingEnabled()) printVars trailingSpace(rawSpace := quote(rawSpace), space := quote(space));
    }
    ret or2(space, defaultSpace);
  }
  
  O getInstruction(Evaluable o) {
    O inner = convert(o);
    
    bool needSemicolon = !o instanceof Tk.ClassDef
      && !o instanceof Tk.ForEachBase;
    
    S space = trailingSpace(o, "\n");
    if (scaffoldingEnabled()) printVars(+space, o := className(o), srcText := quote(o.srcText()), +inner);
    ret inner + (needSemicolon ? ";" : "") + space;
  }

  O convert(Tk.Script script, bool returnLastResult) {
    var steps = asList(script.steps);
    
    if (returnLastResult) {
      if (empty(steps)) ret "return null;";
      var last = last(steps);
      if (!last instanceof Tk.ReturnFromScript
        && !last instanceof Tk.ClassDef)
        setLast(steps, new Tk.ReturnFromScript(script, last));
    }
    
    ret concatMapStrings(i -> str(getInstruction(i)), steps);
  }
  
  O convert(Evaluable o, bool returnLastResult) {
    if (o cast Tk.Script)
      ret convert(o, returnLastResult);
    ret convert(o);
  }
  
  O convert(Evaluable o) {
    if (o == null) null;
    
    // These are the properly implemented cases
    
    if (o cast Tk.GetVar)
      ret o.var;
    
    if (o cast Tk.Script)
      ret convert(o, false);
      
    if (o cast Tk.ClassDef) {
      LASClassDef c = o.lasClass.classDef;
      ret "class " + c.userGivenName + " " + curly("\n" + appendNewLineIfNempty(indentx(
        joinNemptiesWithEmptyLines(
          lines_rtrim(map convert(c.fields)),
          lines_rtrim(map convert(c.methods)))
      )));
    }
    
    if (o cast Tk.Assignment)
      ret o.var + " = " + convert(o.expression);
      
    if (o cast Tk.VarDeclaration)
      ret "var " + o.var + " = " + convert(o.expression);
      
    if (o cast Tk.CallMethod) {
      S targetStr = null;
      var targetType = o.target.returnType();
      if (targetType.knownValue()) {
        O target = targetType.value();
        if (target cast Class && eqOneOf(shortClassName(target), "main", "utils"))
          targetStr = "";
      }
      if (targetStr == null)
        targetStr = str(convert(o.target));
      ret (empty(targetStr) ? "" : targetStr + ".")
        + FunctionCall(o.methodName, map convertWithLeadingSpace2(o.args));
    }
      
    if (o cast Tk.SetField)
      ret convert(o.target) + "." + o.name + " = " + convert(o.expr);
      
    if (o cast Tk.CallMethodOrGetField)
      ret convert(o.target) + "." + o.name + "()";
      
    if (o cast Tk.NewObject)
      ret "new " + FunctionCall(shortClassName(o.c), map convert(o.args));
      
    if (o cast Tk.IfThen)
      ret "if (" + convert(o.condition) + ") "
        + curlyIfScript(o.body)
        + (o.elseBranch == null ? "" : " else "
          + curlyIfScript(o.elseBranch));
      
    if (o cast Tk.Const) {
      var c = o;
      try object c?.srcText();
      pcall {
        ret toJava(o.value);
      }
    }
      
    if (o cast Tk.ForEach)
      ret "fOr (" + o.var + " : " + convert(o.collection) + ") {\n"
        + indentx(convert(o.body, false)) + "\n}";
        
    if (o cast Tk.CurriedScriptFunctionLambda) {
      int nArgs = o.implementedMethod.getParameterCount();
      LS args = countIteratorToList_incl(1, nArgs, i ->"_" + i);
      L fullArgs = concatLists(allToString(map convert(o.curriedArgs)), args);
      ret roundBracketed(shortClassName(o.intrface))
        + " " + lambdaArgsToString_pureJava(args) + " -> "
        + FunctionCall(o.f.name, fullArgs);
    }
        
    if (o cast Tk.LambdaDef)
      ret roundBracketed(shortClassName(o.intrface))
        + " " 
        + joinNemptiesWithSpace(lambdaArgsToString_pureJava(o.args), "-> "
          + curlyIfScript(o.body));
          
    if (o cast Tk.ReturnFromScript)
      ret "ret " + convert(o.value);
    
    // end of explicitly handled cases
    
    warn("Can't convert to Java: " + className(o));
    
    // Retain original script text as a default
    if (o cast Tk.Base) {
      var b = o;
      try object b?.srcText();
    }
    
    // If that fails (it shouldn't), just return the toString
    warn("No source reference in script object: " + className(o));
    ret str(o);
  }
  
  O curlyIfScript(Evaluable o) {
    if (o cast Tk.Script)
      ret "{\n" + indentx(convert(o)) + "\n}";
    ret convert(o);
  }
  
  // get is convert + postProcess
  S get(Evaluable o, bool returnLastResult) {
    S src = strOrEmpty(convert(o, returnLastResult));
    JavaXPeepholeShortener shortener = new(javaTok(src));
    shortener.run();
    ret join(shortener.tok);
  }
}