Roslyn CTP: Three Introductory Projects

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Roslyn.Compilers.CSharp;

namespace RoslynCTPLibrary.Extensions {
    public static class Extensions {
        public static IEnumerable<TFiltered> DescendentNodes<TFiltered>(this SyntaxNode node, Func<TFiltered, bool> predicate) where TFiltered : SyntaxNode { return node.DescendentNodes(root => !(root is TFiltered)).OfType<TFiltered>().Where(predicate); }

        public static TRoot ReplaceNodes<TRoot, TNode>(this TRoot root, IEnumerable<TNode> oldNodes, Func<TNode, SyntaxNode> computeReplacementNode)
            where TRoot : SyntaxNode
            where TNode : SyntaxNode { return root.ReplaceNodes(oldNodes, (oldNode, wth) => computeReplacementNode(oldNode)); }

        public static TypeDeclarationSyntax GetOwnerType<TMember>(this TMember member) where TMember : MemberDeclarationSyntax { return member.FirstAncestorOrSelf<TypeDeclarationSyntax>(); }


        public static bool IsAutoImplemented(this PropertyDeclarationSyntax property) { return property.DescendentNodes().OfType<AccessorDeclarationSyntax>().All(ac => ac.BodyOpt == null); }

        public static AccessorDeclarationSyntax GetGetAccessor(this PropertyDeclarationSyntax property) { return property.DescendentNodes().OfType<AccessorDeclarationSyntax>().SingleOrDefault(ac => ac.Kind == SyntaxKind.GetAccessorDeclaration); }
        public static AccessorDeclarationSyntax GetSetAccessor(this PropertyDeclarationSyntax property) { return property.DescendentNodes().OfType<AccessorDeclarationSyntax>().SingleOrDefault(ac => ac.Kind == SyntaxKind.SetAccessorDeclaration); }

    }
}