// Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team
// 
// 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
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// 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
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// DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.TypeSystem;

namespace ICSharpCode.NRefactory.CSharp.Resolver
{
	/// <summary>
	/// <see cref="IResolveVisitorNavigator"/> implementation that resolves a list of nodes.
	/// We will skip all nodes which are not the target nodes or ancestors of the target nodes.
	/// </summary>
	public class NodeListResolveVisitorNavigator : IResolveVisitorNavigator
	{
		readonly Dictionary<AstNode, ResolveVisitorNavigationMode> dict = new Dictionary<AstNode, ResolveVisitorNavigationMode>();
		
		/// <summary>
		/// Creates a new NodeListResolveVisitorNavigator that resolves the specified nodes.
		/// </summary>
		public NodeListResolveVisitorNavigator(params AstNode[] nodes)
			: this((IEnumerable<AstNode>)nodes)
		{
		}
		
		/// <summary>
		/// Creates a new NodeListResolveVisitorNavigator that resolves the specified nodes.
		/// </summary>
		public NodeListResolveVisitorNavigator(IEnumerable<AstNode> nodes, bool scanOnly = false)
		{
			if (nodes == null)
				throw new ArgumentNullException("nodes");
			foreach (var node in nodes) {
				dict[node] = scanOnly ? ResolveVisitorNavigationMode.Scan : ResolveVisitorNavigationMode.Resolve;
				for (var ancestor = node.Parent; ancestor != null && !dict.ContainsKey(ancestor); ancestor = ancestor.Parent) {
					dict.Add(ancestor, ResolveVisitorNavigationMode.Scan);
				}
			}
		}
		
		/// <inheritdoc/>
		public virtual ResolveVisitorNavigationMode Scan(AstNode node)
		{
			ResolveVisitorNavigationMode mode;
			if (dict.TryGetValue(node, out mode)) {
				return mode;
			} else {
				return ResolveVisitorNavigationMode.Skip;
			}
		}
		
		public virtual void Resolved(AstNode node, ResolveResult result)
		{
		}
		
		public virtual void ProcessConversion(Expression expression, ResolveResult result, Conversion conversion, IType targetType)
		{
		}
	}
}