PetroProtsyk-SSharp/SSharp.Net/Processing/FunctionDeclarationVisitor.cs

/*
 * Copyright © 2011, Petro Protsyk, Denys Vuika
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *  http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System;
using Scripting.SSharp.Runtime;
using Scripting.SSharp.Parser.Ast;

namespace Scripting.SSharp.Processing
{
  internal class FunctionDeclarationVisitor : IPostProcessing
  {
    private Script _script;

    #region IAstVisitor Members

    public bool BeginVisit(AstNode node)
    {
      var definition = node as ScriptFunctionDefinition;
      if (definition == null || string.IsNullOrEmpty(definition.Name)) 
          return true;

      definition._owner = _script;
      _script.Context.SetItem(definition.Name, definition);

      EventBroker.RegisterFunction(definition, _script);
      return true;
    }

    public void EndVisit(AstNode node)
    {
    }

    #endregion

    #region IPostProcessing Members

    public void BeginProcessing(Script script)
    {
      _script = script;
    }

    public void EndProcessing(Script script)
    {
      if (_script != script) throw new InvalidOperationException();
      _script = null;
    }

    #endregion
  }
}