boo-lang /src/Boo.Lang.Compiler/Steps/AstAnnotations.cs

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#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

using Boo.Lang.Compiler.Ast;

namespace Boo.Lang.Compiler.Steps
{
	public class AstAnnotations
	{
		private static object TryBlockDepthKey = new object();
		public const string RawArrayIndexing = "rawarrayindexing";

		public const string Checked = "checked";
		
		public static void MarkChecked(Node node)
		{
			node[AstAnnotations.Checked] = true;
		}

		public static void MarkUnchecked(Node node)
		{
			node[AstAnnotations.Checked] = false;
		}
		
		public static bool IsChecked(Node node)
		{
			return IsChecked(node, true);
		}
		
		public static bool IsChecked(Node node, bool defaultValue)
		{
			return GetBoolAnnotationValue(node, AstAnnotations.Checked, defaultValue);
		}

		public static bool IsRawIndexing(Node node)
		{
			return GetBoolAnnotationValue(node, AstAnnotations.RawArrayIndexing, false);
		}

		public static bool GetBoolAnnotationValue(Node node, string annotation, bool defaultValue)
		{
			object value = node[annotation];
			return value is bool
			       	? (bool)value
			       	: defaultValue;
		}

		public static void MarkRawArrayIndexing(Node node)
		{
			node[AstAnnotations.RawArrayIndexing] = true;
		}

		public static void SetTryBlockDepth(Node node, int depth)
		{
			node[TryBlockDepthKey] = depth;
		}

		public static int GetTryBlockDepth(Node node)
		{
			return (int)node[TryBlockDepthKey];
		}
	}
}
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