DebugInfoExpression.cs source code in C# .NET

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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Scripting / Ast / DebugInfoExpression.cs / 1305376 / DebugInfoExpression.cs

                            /* **************************************************************************** 
 *
 * Copyright (c) Microsoft Corporation.
 *
 * This source code is subject to terms and conditions of the Microsoft Public License. A 
 * copy of the license can be found in the License.html file at the root of this distribution. If
 * you cannot locate the  Microsoft Public License, please send an email to 
 * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 
 * by the terms of the Microsoft Public License.
 * 
 * You must not remove this notice, or any other, from this software.
 *
 *
 * ***************************************************************************/ 

using System.Diagnostics; 
using System.Dynamic.Utils; 

#if SILVERLIGHT 
using System.Core;
#endif

namespace System.Linq.Expressions { 
    /// 
    /// Emits or clears a sequence point for debug information. 
    /// 
    /// This allows the debugger to highlight the correct source code when
    /// debugging. 
    /// 
#if !SILVERLIGHT
    [DebuggerTypeProxy(typeof(Expression.DebugInfoExpressionProxy))]
#endif 
    public class DebugInfoExpression : Expression {
 
        private readonly SymbolDocumentInfo _document; 

        internal DebugInfoExpression(SymbolDocumentInfo document) { 
            _document = document;
        }

        ///  
        /// Gets the static type of the expression that this  represents. (Inherited from .)
        ///  
        /// The  that represents the static type of the expression. 
        public sealed override Type Type {
            get { return typeof(void); } 
        }

        /// 
        /// Returns the node type of this . (Inherited from .) 
        /// 
        /// The  that represents this expression. 
        public sealed override ExpressionType NodeType { 
            get { return ExpressionType.DebugInfo; }
        } 

        /// 
        /// Gets the start line of this .
        ///  
        public virtual int StartLine {
            get { throw ContractUtils.Unreachable; } 
        } 

        ///  
        /// Gets the start column of this .
        /// 
        public virtual int StartColumn {
            get { throw ContractUtils.Unreachable; } 
        }
 
        ///  
        /// Gets the end line of this .
        ///  
        public virtual int EndLine {
            get { throw ContractUtils.Unreachable; }
        }
 
        /// 
        /// Gets the end column of this . 
        ///  
        public virtual int EndColumn {
            get { throw ContractUtils.Unreachable; } 
        }

        /// 
        /// Gets the  that represents the source file. 
        /// 
        public SymbolDocumentInfo Document { 
            get { return _document; } 
        }
 
        /// 
        /// Gets the value to indicate if the  is for clearing a sequence point.
        /// 
        public virtual bool IsClear { 
            get { throw ContractUtils.Unreachable; }
        } 
 
        /// 
        /// Dispatches to the specific visit method for this node type. 
        /// 
        protected internal override Expression Accept(ExpressionVisitor visitor) {
            return visitor.VisitDebugInfo(this);
        } 
    }
 
    #region Specialized subclasses 

    internal sealed class SpanDebugInfoExpression : DebugInfoExpression { 
        private readonly int _startLine, _startColumn, _endLine, _endColumn;

        internal SpanDebugInfoExpression(SymbolDocumentInfo document, int startLine, int startColumn, int endLine, int endColumn)
            : base(document) { 
            _startLine = startLine;
            _startColumn = startColumn; 
            _endLine = endLine; 
            _endColumn = endColumn;
        } 

        public override int StartLine {
            get {
                return _startLine; 
            }
        } 
 
        public override int StartColumn {
            get { 
                return _startColumn;
            }
        }
 
        public override int EndLine {
            get { 
                return _endLine; 
            }
        } 

        public override int EndColumn {
            get {
                return _endColumn; 
            }
        } 
 
        public override bool IsClear {
            get { 
                return false;
            }
        }
 
        protected internal override Expression Accept(ExpressionVisitor visitor) {
            return visitor.VisitDebugInfo(this); 
        } 
    }
 
    internal sealed class ClearDebugInfoExpression : DebugInfoExpression {
        internal ClearDebugInfoExpression(SymbolDocumentInfo document)
            : base(document) {
        } 

        public override bool IsClear { 
            get { 
                return true;
            } 
        }

        public override int StartLine {
            get { 
                return 0xfeefee;
            } 
        } 

        public override int StartColumn { 
            get {
                return 0;
            }
        } 

        public override int EndLine { 
            get { 
                return 0xfeefee;
            } 
        }

        public override int EndColumn {
            get { 
                return 0;
            } 
        } 
    }
    #endregion 

    public partial class Expression {
        /// 
        /// Creates a  with the specified span. 
        /// 
        /// The  that represents the source file. 
        /// The start line of this . Must be greater than 0. 
        /// The start column of this . Must be greater than 0.
        /// The end line of this . Must be greater or equal than the start line. 
        /// The end column of this . If the end line is the same as the start line, it must be greater or equal than the start column. In any case, must be greater than 0.
        /// An instance of .
        public static DebugInfoExpression DebugInfo(SymbolDocumentInfo document, int startLine, int startColumn, int endLine, int endColumn) {
            ContractUtils.RequiresNotNull(document, "document"); 
            if (startLine == 0xfeefee && startColumn == 0 && endLine == 0xfeefee && endColumn == 0) {
                return new ClearDebugInfoExpression(document); 
            } 

            ValidateSpan(startLine, startColumn, endLine, endColumn); 
            return new SpanDebugInfoExpression(document, startLine, startColumn, endLine, endColumn);
        }

        ///  
        /// Creates a  for clearing a sequence point.
        ///  
        /// The  that represents the source file. 
        /// An instance of  for clearning a sequence point.
        public static DebugInfoExpression ClearDebugInfo(SymbolDocumentInfo document) { 
            ContractUtils.RequiresNotNull(document, "document");

            return new ClearDebugInfoExpression(document);
        } 

        private static void ValidateSpan(int startLine, int startColumn, int endLine, int endColumn) { 
            if (startLine < 1) { 
                throw Error.OutOfRange("startLine", 1);
            } 
            if (startColumn < 1) {
                throw Error.OutOfRange("startColumn", 1);
            }
            if (endLine < 1) { 
                throw Error.OutOfRange("endLine", 1);
            } 
            if (endColumn < 1) { 
                throw Error.OutOfRange("endColumn", 1);
            } 
            if (startLine > endLine) {
                throw Error.StartEndMustBeOrdered();
            }
            if (startLine == endLine && startColumn > endColumn) { 
                throw Error.StartEndMustBeOrdered();
            } 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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