source: trunk/sources/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/Completion/CompletionExtensionMethods.cs @ 13397

//
// CompletionExtensionMethods.cs
//
// Author:
//       Mike KrÃŒger <mkrueger@xamarin.com>
//
// Copyright (c) 2012 Xamarin Inc. (http://xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using ICSharpCode.NRefactory.TypeSystem;
using System.Linq;

namespace ICSharpCode.NRefactory.Completion
{
  public static class CompletionExtensionMethods
  {
    /// <summary>
    /// Gets the EditorBrowsableState of an entity.
    /// </summary>
    /// <returns>
    /// The editor browsable state.
    /// </returns>
    /// <param name='entity'>
    /// Entity.
    /// </param>
    public static System.ComponentModel.EditorBrowsableState GetEditorBrowsableState(this IEntity entity)
    {
      if (entity == null)
        throw new ArgumentNullException ("entity");

      var browsableState = entity.Attributes.FirstOrDefault(attr => attr.AttributeType.Name == "EditorBrowsableAttribute" && attr.AttributeType.Namespace == "System.ComponentModel");
      if (browsableState != null && browsableState.PositionalArguments.Count == 1) {
        if (browsableState.PositionalArguments [0].ConstantValue is int)
          return (System.ComponentModel.EditorBrowsableState)(int)browsableState.PositionalArguments [0].ConstantValue;
      }
      return System.ComponentModel.EditorBrowsableState.Always;
    }
    
    /// <summary>
    /// Determines if an entity should be shown in the code completion window. This is the same as:
    /// <c>GetEditorBrowsableState (entity) != System.ComponentModel.EditorBrowsableState.Never</c>
    /// </summary>
    /// <returns>
    /// <c>true</c> if the entity should be shown; otherwise, <c>false</c>.
    /// </returns>
    /// <param name='entity'>
    /// The entity.
    /// </param>
    public static bool IsBrowsable(this IEntity entity)
    {
      return GetEditorBrowsableState (entity) != System.ComponentModel.EditorBrowsableState.Never;
    }
  }
}