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// 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
// 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.PatternMatching;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
/// <summary>
/// Helper class for constructing pattern ASTs.
/// </summary>
public class PatternHelper
{
/// <summary>
/// Produces a choice pattern for <c>expr1 op expr2</c> or <c>expr2 op expr1</c>.
/// </summary>
public static Expression CommutativeOperator(Expression expr1, BinaryOperatorType op, Expression expr2)
{
return new Choice {
new BinaryOperatorExpression(expr1, op, expr2),
new BinaryOperatorExpression(expr2.Clone(), op, expr1.Clone())
};
}
/// <summary>
/// Optionally allows parentheses around the given expression.
/// </summary>
public static Expression OptionalParentheses(Expression expr)
{
return new OptionalParenthesesPattern(expr);
}
sealed class OptionalParenthesesPattern : Pattern
{
readonly INode child;
public OptionalParenthesesPattern(INode child)
{
this.child = child;
}
public override bool DoMatch(INode other, Match match)
{
INode unpacked = ParenthesizedExpression.UnpackParenthesizedExpression(other as Expression);
return child.DoMatch(unpacked, match);
}
}
}
}
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