fix(ast): TryGet* with labels NRE fix

src/RCParsing/ParsedRuleResult.cs

@@ -1,8 +1,5 @@
-using System;
-using System.Collections;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
-using System.Text;
 
 namespace RCParsing
 {

src/RCParsing/ParsedRuleResultBase.cs

@@ -316,15 +316,15 @@ public T GetIntermediateValue<T>(string label)
 		/// <typeparam name="T">The type of value to retrieve.</typeparam>
 		/// <returns>The intermediate value associated with child AST node.</returns>
 		public T? TryGetIntermediateValue<T>(int index)
-			=> TryGetChild(index).IntermediateValue is T result ? result : default;
+			=> TryGetChild(index)?.IntermediateValue is T result ? result : default;
 
 		/// <summary>
 		/// Tries to get the intermediate value associated with child AST node at the specific index as an instance of type <typeparamref name="T"/>.
 		/// </summary>
 		/// <typeparam name="T">The type of value to retrieve.</typeparam>
 		/// <returns>The intermediate value associated with child AST node.</returns>
 		public T? TryGetIntermediateValue<T>(string label)
-			=> TryGetChild(label).IntermediateValue is T result ? result : default;
+			=> TryGetChild(label)?.IntermediateValue is T result ? result : default;
 
 		/// <summary>
 		/// Gets the intermediate value associated with this AST node converted to type <typeparamref name="T"/>.
@@ -460,15 +460,15 @@ public T GetValue<T>(string label)
 		/// <typeparam name="T">The type of value to retrieve.</typeparam>
 		/// <returns>The value associated with child AST node.</returns>
 		public T? TryGetValue<T>(int index)
-			=> TryGetChild(index).Value is T result ? result : default;
+			=> TryGetChild(index)?.Value is T result ? result : default;
 
 		/// <summary>
 		/// Tries to get the value associated with child AST node marked with specified label as an instance of type <typeparamref name="T"/> or <see langword="default"/> value.
 		/// </summary>
 		/// <typeparam name="T">The type of value to retrieve.</typeparam>
 		/// <returns>The value associated with child AST node.</returns>
 		public T? TryGetValue<T>(string label)
-			=> TryGetChild(label).Value is T result ? result : default;
+			=> TryGetChild(label)?.Value is T result ? result : default;
 
 		/// <summary>
 		/// Tries to get the value associated with this AST node as an instance of type <typeparamref name="T"/> or <see langword="default"/> value.
@@ -484,15 +484,15 @@ public T GetValue<T>(string label)
 		/// <typeparam name="T">The type of value to retrieve.</typeparam>
 		/// <returns>The value associated with child AST node.</returns>
 		public T? TryGetNullableValue<T>(int index) where T : struct
-			=> TryGetChild(index).Value is T result ? result : null;
+			=> TryGetChild(index)?.Value is T result ? result : null;
 
 		/// <summary>
 		/// Tries to get the value associated with child AST node marked with specified label as an instance of type <typeparamref name="T"/> or <see langword="default"/> value.
 		/// </summary>
 		/// <typeparam name="T">The type of value to retrieve.</typeparam>
 		/// <returns>The value associated with child AST node.</returns>
 		public T? TryGetNullableValue<T>(string label) where T : struct
-			=> TryGetChild(label).Value is T result ? result : null;
+			=> TryGetChild(label)?.Value is T result ? result : null;
 
 		/// <summary>
 		/// Gets the value associated with this AST node converted to type <typeparamref name="T"/>.

src/RCParsing/RCParsing.csproj

@@ -8,7 +8,7 @@
 
 	<PropertyGroup>
 		<PackageId>RCParsing</PackageId>
-		<Version>5.3.0</Version>
+		<Version>5.3.1</Version>
 		<Authors>Roman K.</Authors>
 		<Company>RomeCore</Company>
 		<Product>RCParsing</Product>