icsharpcode-ILSpy/ICSharpCode.Decompiler/Ast/Transforms/DecimalConstantTransform.cs

// Copyright (c) 2011 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
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using System;
using ICSharpCode.NRefactory.CSharp;
using ICSharpCode.NRefactory.PatternMatching;
using Mono.Cecil;

namespace ICSharpCode.Decompiler.Ast.Transforms
{
	/// <summary>
	/// Transforms decimal constant fields.
	/// </summary>
	public class DecimalConstantTransform : DepthFirstAstVisitor<object, object>, IAstTransform
	{
		static readonly PrimitiveType decimalType = new PrimitiveType("decimal");
		
		public override object VisitFieldDeclaration(FieldDeclaration fieldDeclaration, object data)
		{
			const Modifiers staticReadOnly = Modifiers.Static | Modifiers.Readonly;
			if ((fieldDeclaration.Modifiers & staticReadOnly) == staticReadOnly && decimalType.IsMatch(fieldDeclaration.ReturnType)) {
				foreach (var attributeSection in fieldDeclaration.Attributes) {
					foreach (var attribute in attributeSection.Attributes) {
						TypeReference tr = attribute.Type.Annotation<TypeReference>();
						if (tr != null && tr.Name == "DecimalConstantAttribute" && tr.Namespace == "System.Runtime.CompilerServices") {
							attribute.Remove();
							if (attributeSection.Attributes.Count == 0)
								attributeSection.Remove();
							fieldDeclaration.Modifiers = (fieldDeclaration.Modifiers & ~staticReadOnly) | Modifiers.Const;
							return null;
						}
					}
				}
			}
			return null;
		}
		
		public void Run(AstNode compilationUnit)
		{
			compilationUnit.AcceptVisitor(this, null);
		}
	}
}