Implement FullSpan on tokens & nodes

Parser.Tests/MParserShould.cs

@@ -1,4 +1,5 @@
 using Xunit;
+using FluentAssertions;
 
 namespace Parser.Tests
 {
@@ -95,7 +96,7 @@ namespace Parser.Tests
         [Fact]
         public void ProvidePosition()
         {
-            var text = "2 + 3";
+            var text = "% Comment\n  2 + 3";
             var sut = GetSut(text);
             var actual = sut.Parse();
             var statement = actual.Root.Body.Statements[0].AsNode() as ExpressionStatementSyntaxNode;
@@ -104,8 +105,29 @@ namespace Parser.Tests
             var operation = expression.Operation;
             var rhs = expression.Rhs;
             Assert.Equal(0, lhs.Position);
-            Assert.Equal(2, operation.Position);
+            Assert.Equal(14, operation.Position);
-            Assert.Equal(4, rhs.Position);
+            Assert.Equal(16, rhs.Position);
+        }
+
+        [Fact]
+        public void ProvideFullSpan()
+        {
+            var text = "% Comment\n  2 + 3";
+            var sut = GetSut(text);
+            var actual = sut.Parse();
+            var statement = actual.Root.Body.Statements[0].AsNode() as ExpressionStatementSyntaxNode;
+            var expression = statement!.Expression as BinaryOperationExpressionSyntaxNode;
+            var lhs = expression!.Lhs;
+            var operation = expression.Operation;
+            var rhs = expression.Rhs;
+            expression.FullSpan.Start.Should().Be(0);
+            expression.FullSpan.End.Should().Be(17);
+            lhs.FullSpan.Start.Should().Be(0);
+            lhs.FullSpan.End.Should().Be(14);
+            operation.FullSpan.Start.Should().Be(14);
+            operation.FullSpan.End.Should().Be(16);
+            rhs.FullSpan.Start.Should().Be(16);
+            rhs.FullSpan.End.Should().Be(17);
         }
     }
 }

Parser.Tests/Parser.Tests.csproj

@@ -6,6 +6,7 @@
     <LangVersion>8.0</LangVersion>
   </PropertyGroup>
   <ItemGroup>
+    <PackageReference Include="FluentAssertions" Version="5.10.3" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.1" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1">

Parser/SyntaxNode.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using Parser.Internal;
+using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Linq;
 
@@ -13,6 +14,7 @@ namespace Parser
             _parent = parent;
             _green = green;
             Position = position;
+            FullSpan = new TextSpan(Position, green.FullWidth);
         }
 
         private protected SyntaxNode(Internal.GreenNode green, int position)
@@ -20,6 +22,7 @@ namespace Parser
             _parent = this;
             _green = green;
             Position = position;
+            FullSpan = new TextSpan(Position, green.FullWidth);
         }
 
         public TokenKind Kind => _green.Kind;
@@ -35,6 +38,10 @@ namespace Parser
         
         public int Position { get; }
 
+        public TextSpan FullSpan { get; }
+
+        public int FullWidth => _green.FullWidth;
+
         internal int GetChildPosition(int slot)
         {
             var result = Position;
@@ -75,8 +82,6 @@ namespace Parser
 
         public virtual string FullText => _green.FullText;
 
-        public int FullWidth => _green.FullWidth;
-
         public virtual IReadOnlyList<SyntaxTrivia> LeadingTrivia
         {
             get

Parser/SyntaxToken.cs

@@ -1,4 +1,5 @@
-using System;
+using Parser.Internal;
+using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Linq;
@@ -22,6 +23,7 @@ namespace Parser
             _parent = parent;
             _token = token ?? throw new ArgumentNullException(nameof(token));
             Position = position;
+            FullSpan = new TextSpan(Position, token.FullWidth);
         }
 
         public SyntaxNode Parent => _parent;
@@ -29,6 +31,8 @@ namespace Parser
 
         public int Position { get; }
 
+        public TextSpan FullSpan { get; }
+
         public object? Value => _token.GetValue();
 
         public bool Equals(SyntaxToken other)