#region license
// Copyright (c) 2004, Rodrigo B. de Oliveira (rbo@acm.org)
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
// 
//     * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//     * Neither the name of Rodrigo B. de Oliveira nor the names of its
//     contributors may be used to endorse or promote products derived from this
//     software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion

namespace Boo.Lang.Compiler.Ast
{	
	public class AstUtil
	{
		public static bool IsListGenerator(Node node)
		{			
			if (NodeType.ListLiteralExpression == node.NodeType)
			{
				return IsListGenerator((ListLiteralExpression)node);
			}
			return false;
		}
		
		public static bool IsListGenerator(ListLiteralExpression node)
		{
			return 1 == node.Items.Count &&
				NodeType.GeneratorExpression == node.Items[0].NodeType;
		}		
		
		public static bool IsTargetOfMethodInvocation(Expression node)
		{
			return node.ParentNode.NodeType == NodeType.MethodInvocationExpression &&
					node == ((MethodInvocationExpression)node.ParentNode).Target;
		}
		
		public static bool IsTargetOfSlicing(Expression node)
		{
			if (NodeType.SlicingExpression == node.ParentNode.NodeType)
			{
				if (node == ((SlicingExpression)node.ParentNode).Target)
				{
					return true;
				}
			}
			return false;
		}
		
		public static bool IsLhsOfAssignment(Expression node)
		{
			if (NodeType.BinaryExpression == node.ParentNode.NodeType)
			{
				BinaryExpression be = (BinaryExpression)node.ParentNode;
				if (node == be.Left)
				{
					return IsAssignmentOperator(be.Operator);
				}
			}
			return false;
		}
		
		public static bool IsLhsOfInPlaceAddSubtract(Expression node)
		{
			if (NodeType.BinaryExpression == node.ParentNode.NodeType)
			{
				BinaryExpression be = (BinaryExpression)node.ParentNode;
				if (node == be.Left)
				{
					BinaryOperatorType op = be.Operator;
					return op == BinaryOperatorType.InPlaceAdd ||
							op == BinaryOperatorType.InPlaceSubtract;
				}
			}
			return false;
		}
		
		public static bool IsAssignmentOperator(BinaryOperatorType op)
		{
			return BinaryOperatorType.Assign == op ||
					BinaryOperatorType.InPlaceAdd == op ||
					BinaryOperatorType.InPlaceSubtract == op ||
					BinaryOperatorType.InPlaceMultiply == op ||
					BinaryOperatorType.InPlaceDivide == op;
		}
		
		public static Constructor CreateConstructor(Node lexicalInfoProvider, TypeMemberModifiers modifiers)
		{
			Constructor constructor = new Constructor(lexicalInfoProvider.LexicalInfo);
			constructor.Modifiers = modifiers;
			return constructor;
		}
		
		public static Expression CreateReferenceExpression(string fullname)
		{
			string[] parts = fullname.Split('.');
			ReferenceExpression expression = new ReferenceExpression(parts[0]);
			for (int i=1; i<parts.Length; ++i)
			{
				expression = new MemberReferenceExpression(expression, parts[i]);
			}
			return expression;
		}
		
		public static MethodInvocationExpression CreateMethodInvocationExpression(Expression target, Expression arg)
		{
			MethodInvocationExpression mie = new MethodInvocationExpression(arg.LexicalInfo);
			mie.Target = (Expression)target.Clone();			
			mie.Arguments.Add((Expression)arg.Clone());
			return mie;
		}
		
		private AstUtil()
		{
		}
	}
}
