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CodeDom Assistant

, 21 Sep 2007
Generating CodeDom Code By Parsing C# or VB
codedomassistant_demo.zip
CodeDomAssistant_Demo
CodeDomAssistant.exe
ICSharpCode.NRefactory.dll
RemoteLoader.dll
SciLexer.dll
ScintillaNet.dll
codedomassistant_src.zip
sln.CodeDomAssistant
CodeDomAssistant
bin
Debug
SciLexer.dll
Properties
Settings.settings
NRefactory
NRefactoryASTGenerator
AST
Project
Configuration
Resources
ICSharpCode.NRefactory.snk
Src
Ast
General
Lexer
BuildKeywords.pl
CSharp
Special
VBNet
Parser
CSharp
cs.ATG
Frames
Parser.frame
Scanner.frame
SharpCoco.exe
VBNet
VBNET.ATG
PrettyPrinter
CSharp
VBNet
Visitors
Test
General
Lexer
CSharp
VBNet
Output
CodeDOM
CSharp
VBNet
Parser
Expressions
GlobalScope
Statements
TypeLevel
RemoteLoader
Properties
ScintillaNET
Configuration
Builtin
LexerKeywordListNames
LexerStyleNames
FindReplace
Printing
Properties
Resources
DeleteHS.png
GoToNextMessage - Copy.png
GoToNextMessage.png
GoToPreviousMessage.png
LineColorHS.png
Thumbs.db
ScintillaNET.csproj.vspscc
Snippets
// <file>
//     <copyright see="prj:///doc/copyright.txt"/>
//     <license see="prj:///doc/license.txt"/>
//     <owner name="Mike Krüger" email="mike@icsharpcode.net"/>
//     <version>$Revision: 1965 $</version>
// </file>

using System;

namespace ICSharpCode.NRefactory.Ast
{
	public abstract class Expression : AbstractNode, INullable
	{
		public static NullExpression Null {
			get {
				return NullExpression.Instance;
			}
		}
		
		public virtual bool IsNull {
			get {
				return false;
			}
		}
		
		public static Expression CheckNull(Expression expression)
		{
			return expression == null ? NullExpression.Instance : expression;
		}
		
		/// <summary>
		/// Returns the existing expression plus the specified integer value.
		/// WARNING: This method modifies <paramref name="expr"/> and possibly returns <paramref name="expr"/>
		/// again, but it might also create a new expression around <paramref name="expr"/>.
		/// </summary>
		public static Expression AddInteger(Expression expr, int value)
		{
			PrimitiveExpression pe = expr as PrimitiveExpression;
			if (pe != null && pe.Value is int) {
				int newVal = (int)pe.Value + value;
				return new PrimitiveExpression(newVal, newVal.ToString(System.Globalization.NumberFormatInfo.InvariantInfo));
			}
			BinaryOperatorExpression boe = expr as BinaryOperatorExpression;
			if (boe != null && boe.Op == BinaryOperatorType.Add) {
				boe.Right = AddInteger(boe.Right, value);
				if (boe.Right is PrimitiveExpression && ((PrimitiveExpression)boe.Right).Value is int) {
					int newVal = (int)((PrimitiveExpression)boe.Right).Value;
					if (newVal == 0) {
						return boe.Left;
					} else if (newVal < 0) {
						((PrimitiveExpression)boe.Right).Value = -newVal;
						boe.Op = BinaryOperatorType.Subtract;
					}
				}
				return boe;
			}
			if (boe != null && boe.Op == BinaryOperatorType.Subtract) {
				pe = boe.Right as PrimitiveExpression;
				if (pe != null && pe.Value is int) {
					int newVal = (int)pe.Value - value;
					if (newVal == 0)
						return boe.Left;
					if (newVal < 0) {
						newVal = -newVal;
						boe.Op = BinaryOperatorType.Add;
					}
					boe.Right = new PrimitiveExpression(newVal, newVal.ToString(System.Globalization.NumberFormatInfo.InvariantInfo));
					return boe;
				}
			}
			BinaryOperatorType opType = BinaryOperatorType.Add;
			if (value < 0) {
				value = -value;
				opType = BinaryOperatorType.Subtract;
			}
			return new BinaryOperatorExpression(expr, opType, new PrimitiveExpression(value, value.ToString(System.Globalization.NumberFormatInfo.InvariantInfo)));
		}
	}
	
	public class NullExpression : Expression
	{
		static NullExpression nullExpression = new NullExpression();
		
		public override bool IsNull {
			get {
				return true;
			}
		}
		
		public static NullExpression Instance {
			get {
				return nullExpression;
			}
		}
		
		NullExpression()
		{
		}
		
		public override object AcceptVisitor(IAstVisitor visitor, object data)
		{
			return null;
		}
		
		public override string ToString()
		{
			return String.Format("[NullExpression]");
		}
	}
}

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About the Author

raygilbert
Web Developer
Australia Australia
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