org.snapscript.tree.construct.CreateObject Maven / Gradle / Ivy

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package org.snapscript.tree.construct;

import static org.snapscript.core.Reserved.TYPE_CONSTRUCTOR;

import java.util.concurrent.Callable;

import org.snapscript.core.Context;
import org.snapscript.core.Evaluation;
import org.snapscript.core.InternalStateException;
import org.snapscript.core.Module;
import org.snapscript.core.Result;
import org.snapscript.core.Scope;
import org.snapscript.core.Type;
import org.snapscript.core.Value;
import org.snapscript.core.ValueType;
import org.snapscript.core.bind.FunctionBinder;
import org.snapscript.tree.ArgumentList;
import org.snapscript.tree.reference.CompiledReference;

public class CreateObject implements Evaluation {
   
   private final ArgumentList arguments;
   private final Evaluation reference;

   public CreateObject(Evaluation reference, ArgumentList arguments) {
      this.reference = new CompiledReference(reference);
      this.arguments = arguments;
   }      
   
   @Override
   public Value evaluate(Scope scope, Object left) throws Exception { // this is rubbish
      Value value = reference.evaluate(scope, null);
      Type type = value.getValue();
      Callable call = bind(scope, type);
           
      if(call == null){
         throw new InternalStateException("No constructor for '" + type + "'");
      }
      Result result = call.call();
      Object instance = result.getValue();
      
      return ValueType.getTransient(instance);
   }
   
   private Callable bind(Scope scope, Type type) throws Exception {
      Module module = scope.getModule();
      Context context = module.getContext();
      FunctionBinder binder = context.getBinder();
      Class real = type.getType();
      
      if(arguments != null) {
         if(real == null) {
            Value array = arguments.create(scope, type); 
            Object[] arguments = array.getValue();
            
            return binder.bind(scope, type, TYPE_CONSTRUCTOR, arguments);
         }
         Value array = arguments.create(scope); 
         Object[] arguments = array.getValue();
         
         return binder.bind(scope, type, TYPE_CONSTRUCTOR, arguments);
      }
      if(real == null) {
         return binder.bind(scope, type, TYPE_CONSTRUCTOR, type);
      }
      return binder.bind(scope, type, TYPE_CONSTRUCTOR);
   }
}