improved test cursor

.editorconfig

@@ -171,6 +171,9 @@ dotnet_diagnostic.SA1308.severity = none
 # SA1311: Static readonly fields should begin with upper-case letter
 dotnet_diagnostic.SA1311.severity = none
 
+# SA1503: Braces should not be omitted
+dotnet_diagnostic.SA1503.severity = none
+
 # CSharp code style settings:
 [*.cs]
 # Newline settings

OffDotNet.slnx

@@ -0,0 +1,47 @@
+<Solution>
+  <Folder Name="/Solution Items/">
+    <File Path=".editorconfig" />
+    <File Path=".gitattributes" />
+    <File Path=".gitignore" />
+    <File Path=".netconfig" />
+    <File Path="README.md" />
+    <File Path="Directory.Build.targets" />
+    <File Path="stryker-config.json" />
+    <File Path="LICENSE" />
+    <File Path="Directory.Build.props" />
+    <File Path="stylecop.json" />
+    <File Path="Directory.Packages.props" />
+    <File Path=".deepsource.toml" />
+  </Folder>
+  <Folder Name="/Solution Items/.config/">
+    <File Path=".config\dotnet-tools.json" />
+  </Folder>
+  <Folder Name="/Solution Items/.github/">
+    <File Path=".github\CODEOWNERS" />
+    <File Path=".github\dependabot.yml" />
+  </Folder>
+  <Folder Name="/Solution Items/.github/workflows/">
+    <File Path=".github\workflows\dotnet.yml" />
+    <File Path=".github\workflows\codeql.yml" />
+    <File Path=".github\workflows\dependency-review.yml" />
+    <File Path=".github\workflows\scorecard.yml" />
+  </Folder>
+  <Folder Name="/Solution Items/tools/">
+    <File Path="tools\code-coverage.bat" />
+    <File Path="tools\code-coverage.ps1" />
+    <File Path="tools\mutation-testing.bat" />
+    <File Path="tools\mutation-testing.ps1" />
+    <File Path="tools\benchmarks.bat" />
+    <File Path="tools\benchmarks.ps1" />
+  </Folder>
+  <Folder Name="/src/">
+    <Project Path="src\OffDotNet.CodeAnalysis.Pdf\OffDotNet.CodeAnalysis.Pdf.csproj" Type="Classic C#" />
+    <Project Path="src\OffDotNet.CodeAnalysis\OffDotNet.CodeAnalysis.csproj" Type="Classic C#" />
+    <File Path="src\Directory.Build.props" />
+  </Folder>
+  <Folder Name="/tests/">
+    <Project Path="tests\OffDotNet.CodeAnalysis.Pdf.Tests\OffDotNet.CodeAnalysis.Pdf.Tests.csproj" Type="Classic C#" />
+    <Project Path="tests\OffDotNet.CodeAnalysis.Tests\OffDotNet.CodeAnalysis.Tests.csproj" Type="Classic C#" />
+    <File Path="tests\Directory.Build.props" />
+  </Folder>
+</Solution>

src/OffDotNet.CodeAnalysis.Pdf/Configurations/DiagnosticOptions.cs → src/OffDotNet.CodeAnalysis.Pdf/Configs/DiagnosticOptions.cs

@@ -3,7 +3,7 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 // </copyright>
 
-namespace OffDotNet.CodeAnalysis.Pdf.Configurations;
+namespace OffDotNet.CodeAnalysis.Pdf.Configs;
 
 public sealed record DiagnosticOptions
 {

src/OffDotNet.CodeAnalysis.Pdf/Configurations/RootConfigurations.cs → src/OffDotNet.CodeAnalysis.Pdf/Configs/RootConfigurations.cs

@@ -3,11 +3,15 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 // </copyright>
 
-namespace OffDotNet.CodeAnalysis.Pdf.Configurations;
+namespace OffDotNet.CodeAnalysis.Pdf.Configs;
+
+using OffDotNet.CodeAnalysis.Configs;
 
 public sealed record RootConfigurations
 {
     public const string SectionName = "OffDotNet";
 
     public required DiagnosticOptions Diagnostic { get; init; }
+
+    public required TextCursorOptions TextCursor { get; init; }
 }

src/OffDotNet.CodeAnalysis.Pdf/Dependencies.cs

@@ -3,9 +3,10 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 // </copyright>
 
+using OffDotNet.CodeAnalysis.Pdf.Configs;
+
 namespace OffDotNet.CodeAnalysis.Pdf;
 
-using Configurations;
 using Diagnostics;
 using Microsoft.Extensions.DependencyInjection;
 using OffDotNet.CodeAnalysis.Diagnostics;

src/OffDotNet.CodeAnalysis.Pdf/Diagnostics/MessageProvider.cs

@@ -3,9 +3,10 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 // </copyright>
 
+using OffDotNet.CodeAnalysis.Pdf.Configs;
+
 namespace OffDotNet.CodeAnalysis.Pdf.Diagnostics;
 
-using Configurations;
 using Microsoft.Extensions.Localization;
 using Microsoft.Extensions.Options;
 using OffDotNet.CodeAnalysis.Diagnostics;

src/OffDotNet.CodeAnalysis.Pdf/Syntax/RawSyntaxToken.cs

@@ -139,14 +139,14 @@ internal static RawSyntaxToken Create(SyntaxKind kind, Option<AbstractNode> lead
     /// <param name="trailing">Whether to include trailing trivia.</param>
     protected override void WriteTokenTo(TextWriter writer, bool leading, bool trailing)
     {
-        if (leading && LeadingTrivia.IsSome(out var leadingTrivia))
+        if (leading && LeadingTrivia.TryGetValue(out var leadingTrivia))
         {
             leadingTrivia.WriteTo(writer, leading: true, trailing: false);
         }
 
         writer.Write(this.Text);
 
-        if (trailing && TrailingTrivia.IsSome(out var trailingTrivia))
+        if (trailing && TrailingTrivia.TryGetValue(out var trailingTrivia))
         {
             trailingTrivia.WriteTo(writer, leading: false, trailing: true);
         }

src/OffDotNet.CodeAnalysis/Configs/TextCursorOptions.cs

@@ -0,0 +1,11 @@
+// <copyright file="TextCursorOptions.cs" company="Sunt Programator">
+// Copyright (c) Sunt Programator. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace OffDotNet.CodeAnalysis.Configs;
+
+public sealed record TextCursorOptions
+{
+    public int WindowSize { get; init; } = 2048;
+}

src/OffDotNet.CodeAnalysis/Lexer/ISourceText.cs

@@ -13,5 +13,5 @@ public interface ISourceText
 
     byte this[int position] { get; }
 
-    void CopyTo(int sourceIndex, byte[] destination, int destinationIndex, int count);
+    void CopyTo(int sourceIndex, Span<byte> destination, int destinationIndex, int count);
 }

src/OffDotNet.CodeAnalysis/Lexer/ITextCursor.cs

@@ -43,28 +43,31 @@ public interface ITextCursor : IDisposable
     bool IsAtEnd { get; }
 
     /// <summary>Gets the start offset inside the window (relative to the <see cref="ISourceText"/> start).</summary>
-    int Basis { get; }
+    int WindowStart { get; }
 
-    /// <summary>Gets the end offset inside the window (relative to the <see cref="Basis"/>).</summary>
+    /// <summary>Gets the end offset inside the window (relative to the <see cref="WindowStart"/>).</summary>
     int Offset { get; }
 
     /// <summary>Gets the absolute position in the <see cref="ISourceText"/>.</summary>
-    int Position => Basis + Offset;
+    int Position => WindowStart + Offset;
 
     /// <summary>Gets a value indicating whether the window is in parsing lexeme mode.</summary>
     bool IsLexemeMode { get; }
 
-    /// <summary>Gets the lexeme start offset relative to the <see cref="Basis">window start</see>.</summary>
-    int LexemeBasis { get; }
+    /// <summary>Gets the lexeme start offset relative to the <see cref="WindowStart">window start</see>.</summary>
+    int LexemeStart { get; }
 
     /// <summary>Gets the absolute position of the lexeme in the <see cref="ISourceText"/>.</summary>
-    int LexemePosition => Basis + LexemeBasis;
+    int LexemePosition => WindowStart + LexemeStart;
 
     /// <summary>Gets the width of the lexeme.</summary>
-    int LexemeWidth => Offset - LexemeBasis;
+    int LexemeWidth => Offset - LexemeStart;
+
+    /// <summary>Gets the text window.</summary>
+    ReadOnlyMemory<byte> Window { get; }
 
     /// <summary>Gets the number of characters in the window.</summary>
-    int WindowCount { get; }
+    int WindowSize { get; }
 
     /// <summary>
     /// Peeks at the byte at the specified delta from the current position.
@@ -99,7 +102,12 @@ public interface ITextCursor : IDisposable
     /// <returns>True if the cursor was advanced; otherwise, false.</returns>
     bool TryAdvance(ReadOnlySpan<byte> subtext);
 
-    /// <summary>Starts parsing a lexeme and sets the <see cref="LexemeBasis"/> to the current <see cref="Offset"/> value.</summary>
+    /// <summary>Slides the text window to the specified start position and size.</summary>
+    /// <param name="windowStart">The start position of the window.</param>
+    /// <param name="windowSize">The size of the window.</param>
+    void SlideTextWindow(int windowStart = -1, int windowSize = -1);
+
+    /// <summary>Starts parsing a lexeme and sets the <see cref="LexemeStart"/> to the current <see cref="Offset"/> value.</summary>
     public void StartLexemeMode();
 
     /// <summary>Stops parsing a lexeme.</summary>

src/OffDotNet.CodeAnalysis/Lexer/StringText.cs

@@ -18,8 +18,8 @@ internal StringText(in ReadOnlySpan<byte> source)
 
     public byte this[int position] => Source.Span[position];
 
-    public void CopyTo(int sourceIndex, byte[] destination, int destinationIndex, int count)
+    public void CopyTo(int sourceIndex, Span<byte> destination, int destinationIndex, int count)
     {
-        Source.Span.Slice(sourceIndex, count).CopyTo(destination.AsSpan(destinationIndex));
+        Source.Span.Slice(sourceIndex, count).CopyTo(destination[destinationIndex..]);
     }
 }