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AspClassic.Parser/DictionaryLookupExpression.cs

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+using System;
+using System.Collections.Generic;
+
+namespace AspClassic.Parser;
+
+/// <summary>
+/// A parse tree for a dictionary lookup expression.
+/// </summary>
+public sealed class DictionaryLookupExpression : Expression
+{
+	private readonly Expression _Qualifier;
+
+	private readonly Location _BangLocation;
+
+	private readonly SimpleName _Name;
+
+	/// <summary>
+	/// The dictionary expression.
+	/// </summary>
+	public Expression Qualifier => _Qualifier;
+
+	/// <summary>
+	/// The location of the '!'.
+	/// </summary>
+	public Location BangLocation => _BangLocation;
+
+	/// <summary>
+	/// The name to look up.
+	/// </summary>
+	public SimpleName Name => _Name;
+
+	/// <summary>
+	/// Constructs a new parse tree for a dictionary lookup expression.
+	/// </summary>
+	/// <param name="qualifier">The dictionary expression.</param>
+	/// <param name="bangLocation">The location of the '!'.</param>
+	/// <param name="name">The name to look up..</param>
+	/// <param name="span">The location of the parse tree.</param>
+	public DictionaryLookupExpression(Expression qualifier, Location bangLocation, SimpleName name, Span span)
+		: base(TreeType.DictionaryLookupExpression, span)
+	{
+		if (name == null)
+		{
+			throw new ArgumentNullException("name");
+		}
+		SetParent(qualifier);
+		SetParent(name);
+		_Qualifier = qualifier;
+		_BangLocation = bangLocation;
+		_Name = name;
+	}
+
+	protected override void GetChildTrees(IList<Tree> childList)
+	{
+		Tree.AddChild(childList, Qualifier);
+		Tree.AddChild(childList, Name);
+	}
+}