// 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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// 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
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using System;
using System.Linq;

namespace ICSharpCode.Decompiler.CSharp.Syntax
{
	/// <summary>
	/// Matches identifier expressions that have the same identifier as the referenced variable/type definition/method definition.
	/// </summary>
	public class IdentifierExpressionBackreference : PatternMatching.Pattern
	{
		readonly string referencedGroupName;
		
		public string ReferencedGroupName {
			get { return referencedGroupName; }
		}
		
		public IdentifierExpressionBackreference(string referencedGroupName)
		{
			if (referencedGroupName == null)
				throw new ArgumentNullException(nameof(referencedGroupName));
			this.referencedGroupName = referencedGroupName;
		}
		
		public override bool DoMatch(PatternMatching.INode other, PatternMatching.Match match)
		{
			IdentifierExpression ident = other as IdentifierExpression;
			if (ident == null || ident.TypeArguments.Any())
				return false;
			AstNode referenced = (AstNode)match.Get(referencedGroupName).Last();
			if (referenced == null)
				return false;
			return ident.Identifier == referenced.GetChildByRole(Roles.Identifier).Name;
		}
	}
}
