Make classes related to page content parsing public

src/UglyToad.PdfPig.Tests/Parser/PageContentParserTests.cs

@@ -15,7 +15,7 @@
 
     public class PageContentParserTests
     {
-        private readonly PageContentParser parser = new PageContentParser(new ReflectionGraphicsStateOperationFactory());
+        private readonly PageContentParser parser = new PageContentParser(ReflectionGraphicsStateOperationFactory.Instance);
         private readonly ILog log = new NoOpLog();
 
         [Fact]

src/UglyToad.PdfPig.Tests/PublicApiScannerTests.cs

@@ -125,6 +125,8 @@
                 "UglyToad.PdfPig.Geometry.GeometryExtensions",
                 "UglyToad.PdfPig.Geometry.UserSpaceUnit",
                 "UglyToad.PdfPig.Graphics.BaseStreamProcessor`1",
+                "UglyToad.PdfPig.Graphics.IGraphicsStateOperationFactory",
+                "UglyToad.PdfPig.Graphics.ReflectionGraphicsStateOperationFactory",
                 "UglyToad.PdfPig.Graphics.Colors.CMYKColor",
                 "UglyToad.PdfPig.Graphics.Colors.ColorSpace",
                 "UglyToad.PdfPig.Graphics.PdfPath",
@@ -265,6 +267,7 @@
                 "UglyToad.PdfPig.Outline.Destinations.NamedDestinations",
                 "UglyToad.PdfPig.ParsingOptions",
                 "UglyToad.PdfPig.Parser.IPageContentParser",
+                "UglyToad.PdfPig.Parser.PageContentParser",
                 "UglyToad.PdfPig.Parser.Parts.DirectObjectFinder",
                 "UglyToad.PdfPig.PdfDocument",
                 "UglyToad.PdfPig.PdfExtensions",

src/UglyToad.PdfPig/Graphics/IGraphicsStateOperationFactory.cs

@@ -4,8 +4,16 @@
     using Operations;
     using Tokens;
 
-    internal interface IGraphicsStateOperationFactory
+    /// <summary>
+    /// Graphics state operation factory interface.
+    /// </summary>
+    public interface IGraphicsStateOperationFactory
     {
+        /// <summary>
+        /// Create a graphics state operation.
+        /// </summary>
+        /// <param name="op">The operator token to build from.</param>
+        /// <param name="operands"></param>
         IGraphicsStateOperation? Create(OperatorToken op, IReadOnlyList<IToken> operands);
     }
 }

src/UglyToad.PdfPig/Graphics/ReflectionGraphicsStateOperationFactory.cs

@@ -23,8 +23,21 @@ namespace UglyToad.PdfPig.Graphics
     using System.Reflection;
     using Tokens;
 
-    internal sealed class ReflectionGraphicsStateOperationFactory : IGraphicsStateOperationFactory
+    /// <summary>
+    /// Reflection based graphics state operation factory.
+    /// </summary>
+    public sealed class ReflectionGraphicsStateOperationFactory : IGraphicsStateOperationFactory
     {
+        /// <summary>
+        /// The single instance of the <see cref="ReflectionGraphicsStateOperationFactory"/>.
+        /// </summary>
+        public static readonly ReflectionGraphicsStateOperationFactory Instance = new ReflectionGraphicsStateOperationFactory();
+
+        private ReflectionGraphicsStateOperationFactory()
+        {
+            // private
+        }
+        
         private static readonly IReadOnlyDictionary<string, Type> operations =
             new Dictionary<string, Type>
             {
@@ -161,6 +174,7 @@ namespace UglyToad.PdfPig.Graphics
             return numeric.Data;
         }
 
+        /// <inheritdoc/>
         public IGraphicsStateOperation? Create(OperatorToken op, IReadOnlyList<IToken> operands)
         {
             switch (op.Data)

src/UglyToad.PdfPig/Parser/PageContentParser.cs

@@ -12,17 +12,44 @@
     using Tokenization.Scanner;
     using Tokens;
 
-    internal sealed class PageContentParser : IPageContentParser
+    /// <summary>
+    /// Provides functionality to parse the content of a PDF page, extracting graphics state operations
+    /// from the input data. This class is responsible for interpreting the PDF content stream and
+    /// converting it into a collection of operations.
+    /// </summary>
+    public sealed class PageContentParser : IPageContentParser
     {
         private readonly IGraphicsStateOperationFactory operationFactory;
         private readonly bool useLenientParsing;
 
+        /// <summary>
+        /// Initialises a new instance of the <see cref="PageContentParser"/> class.
+        /// </summary>
+        /// <param name="operationFactory">
+        /// The factory responsible for creating graphics state operations.
+        /// </param>
+        /// <param name="useLenientParsing">
+        /// A value indicating whether lenient parsing should be used. Defaults to <c>false</c>.
+        /// </param>
         public PageContentParser(IGraphicsStateOperationFactory operationFactory, bool useLenientParsing = false)
         {
             this.operationFactory = operationFactory;
             this.useLenientParsing = useLenientParsing;
         }
 
+        /// <summary>
+        /// Parses the content of a PDF page and extracts a collection of graphics state operations.
+        /// </summary>
+        /// <param name="pageNumber">The number of the page being parsed.</param>
+        /// <param name="inputBytes">The input bytes representing the content of the page.</param>
+        /// <param name="log">The logger instance for recording parsing-related information.</param>
+        /// <returns>A read-only list of graphics state operations extracted from the page content.</returns>
+        /// <exception cref="ArgumentNullException">
+        /// Thrown if <paramref name="inputBytes"/> or <paramref name="log"/> is <c>null</c>.
+        /// </exception>
+        /// <exception cref="InvalidOperationException">
+        /// Thrown if the parsing process encounters an invalid or unsupported token.
+        /// </exception>
         public IReadOnlyList<IGraphicsStateOperation> Parse(
             int pageNumber,
             IInputBytes inputBytes,

src/UglyToad.PdfPig/Parser/PdfDocumentFactory.cs

@@ -192,7 +192,7 @@
                 parsingOptions.UseLenientParsing);
 
             var pageFactory = new PageFactory(pdfScanner, resourceContainer, filterProvider,
-                new PageContentParser(new ReflectionGraphicsStateOperationFactory(), parsingOptions.UseLenientParsing), parsingOptions);
+                new PageContentParser(ReflectionGraphicsStateOperationFactory.Instance, parsingOptions.UseLenientParsing), parsingOptions);
 
             var catalog = CatalogFactory.Create(
                 rootReference,

src/UglyToad.PdfPig/Writer/NoTextTokenWriter.cs

@@ -74,7 +74,7 @@ namespace UglyToad.PdfPig.Writer
                 return false;
             }
 
-            var pageContentParser = new PageContentParser(new ReflectionGraphicsStateOperationFactory());
+            var pageContentParser = new PageContentParser(ReflectionGraphicsStateOperationFactory.Instance);
             IReadOnlyList<IGraphicsStateOperation> operations;
             try
             {