Cleanup using statements

src/UglyToad.PdfPig/AcroForms/AcroForm.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.AcroForms
 {
-    using System;
-    using System.Collections.Generic;
     using System.Linq;
     using Core;
     using Fields;

src/UglyToad.PdfPig/AcroForms/AcroFormExtensions.cs

@@ -1,8 +1,7 @@
 namespace UglyToad.PdfPig.AcroForms
 {
-    using System.Collections.Generic;
     using System.Linq;
-    using UglyToad.PdfPig.AcroForms.Fields;
+    using Fields;
 
     /// <summary>
     /// Extensions for AcroForm.

src/UglyToad.PdfPig/AcroForms/AcroFormFactory.cs

@@ -1,14 +1,12 @@
 namespace UglyToad.PdfPig.AcroForms
 {
+    using System.Linq;
     using Content;
     using Core;
     using CrossReference;
     using Fields;
     using Filters;
     using Parser.Parts;
-    using System;
-    using System.Collections.Generic;
-    using System.Linq;
     using Tokenization.Scanner;
     using Tokens;
     using Util;

src/UglyToad.PdfPig/AcroForms/Fields/AcroButtonFieldFlags.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.AcroForms.Fields
 {
-    using System;
-
     /// <summary>
     /// Flags specifying various characteristics of a button type field in an <see cref="AcroFieldBase"/>.
     /// </summary>

src/UglyToad.PdfPig/AcroForms/Fields/AcroCheckboxesField.cs

@@ -1,6 +1,5 @@
 namespace UglyToad.PdfPig.AcroForms.Fields
 {
-    using System.Collections.Generic;
     using Tokens;
 
     /// <inheritdoc />

src/UglyToad.PdfPig/AcroForms/Fields/AcroChoiceFieldFlags.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.AcroForms.Fields
 {
-    using System;
-
     /// <summary>
     /// Flags specifying various characteristics of a choice type field in an <see cref="AcroFieldBase"/>.
     /// </summary>

src/UglyToad.PdfPig/AcroForms/Fields/AcroComboBoxField.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.AcroForms.Fields
 {
-    using System;
-    using System.Collections.Generic;
     using Core;
     using Tokens;
 

src/UglyToad.PdfPig/AcroForms/Fields/AcroFieldBase.cs

@@ -1,7 +1,6 @@
 namespace UglyToad.PdfPig.AcroForms.Fields
 {
     using Core;
-    using System;
     using Tokens;
 
     /// <summary>

src/UglyToad.PdfPig/AcroForms/Fields/AcroListBoxField.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.AcroForms.Fields
 {
-    using System;
-    using System.Collections.Generic;
     using Core;
     using Tokens;
 

src/UglyToad.PdfPig/AcroForms/Fields/AcroNonTerminalField.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.AcroForms.Fields
 {
-    using System;
-    using System.Collections.Generic;
     using Tokens;
 
     /// <inheritdoc />

src/UglyToad.PdfPig/AcroForms/Fields/AcroRadioButtonsField.cs

@@ -1,6 +1,5 @@
 namespace UglyToad.PdfPig.AcroForms.Fields
 {
-    using System.Collections.Generic;
     using Tokens;
 
     /// <inheritdoc />

src/UglyToad.PdfPig/AcroForms/Fields/AcroTextFieldFlags.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.AcroForms.Fields
 {
-    using System;
-
     /// <summary>
     /// Flags specifying various characteristics of a text type field in an <see cref="AcroFieldBase"/>.
     /// </summary>

src/UglyToad.PdfPig/AcroForms/SignatureFlags.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.AcroForms
 {
-    using System;
-
     /// <summary>
     /// Specifies document level characteristics for any signature fields in the document's <see cref="AcroForm"/>.
     /// </summary>
@@ -12,6 +10,7 @@ public enum SignatureFlags
         /// The document contains at least one signature field.
         /// </summary>
         SignaturesExist = 1 << 0,
+
         /// <summary>
         /// The document contains signatures which may be invalidated if the file is saved
         /// in a way which alters its previous content rather than simply appending new content.

src/UglyToad.PdfPig/AdvancedPdfDocumentAccess.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig
 {
-    using System;
-    using System.Collections.Generic;
     using System.Diagnostics.CodeAnalysis;
     using Content;
     using Core;

src/UglyToad.PdfPig/Annotations/Annotation.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Annotations
 {
-    using System;
-    using System.Collections.Generic;
     using Core;
     using Actions;
     using Tokens;

src/UglyToad.PdfPig/Annotations/AnnotationBorder.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Annotations
 {
-    using System.Collections.Generic;
-
     /// <summary>
     /// A border for a PDF <see cref="Annotation"/> object.
     /// </summary>

src/UglyToad.PdfPig/Annotations/AnnotationFlags.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Annotations
 {
-    using System;
-
     /// <summary>
     /// Specifies characteristics of an annotation in a PDF or FDF document.
     /// </summary>

src/UglyToad.PdfPig/Annotations/AnnotationProvider.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Annotations
 {
-    using System;
-    using System.Collections.Generic;
     using System.Linq;
     using Actions;
     using Core;

src/UglyToad.PdfPig/Annotations/AppearanceStream.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Annotations
 {
-    using System;
-    using System.Collections.Generic;
     using Tokens;
 
     /// <summary>

src/UglyToad.PdfPig/Annotations/AppearanceStreamFactory.cs

@@ -1,6 +1,5 @@
 namespace UglyToad.PdfPig.Annotations
 {
-    using System.Collections.Generic;
     using System.Diagnostics.CodeAnalysis;
     using Tokenization.Scanner;
     using Tokens;

src/UglyToad.PdfPig/Annotations/HyperlinkFactory.cs

@@ -1,6 +1,5 @@
 namespace UglyToad.PdfPig.Annotations
 {
-    using System.Collections.Generic;
     using System.Linq;
     using Content;
     using Core;

src/UglyToad.PdfPig/Annotations/QuadPointsQuadrilateral.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Annotations
 {
-    using System;
-    using System.Collections.Generic;
     using Core;
 
     /// <summary>

src/UglyToad.PdfPig/Content/ArtifactMarkedContentElement.cs

@@ -1,10 +1,8 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
-    using System.Collections.Generic;
     using Core;
+    using Graphics;
     using Tokens;
-    using UglyToad.PdfPig.Graphics;
 
     /// <inheritdoc />
     /// <summary>

src/UglyToad.PdfPig/Content/BasePageFactory.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
-    using System.Collections.Generic;
     using Core;
     using Filters;
     using Geometry;

src/UglyToad.PdfPig/Content/Catalog.cs

@@ -1,6 +1,5 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
     using Outline.Destinations;
     using Tokens;
 

src/UglyToad.PdfPig/Content/DocumentInformation.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
-    using System.Collections.Generic;
     using System.Text;
     using Tokens;
     using Util;

src/UglyToad.PdfPig/Content/EmbeddedFile.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
-    using System.Collections.Generic;
     using Tokens;
 
     /// <summary>

src/UglyToad.PdfPig/Content/HeaderVersion.cs

@@ -1,8 +1,6 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
-
-    internal class HeaderVersion
+    internal sealed class HeaderVersion
     {
         public double Version { get; }
 

src/UglyToad.PdfPig/Content/Hyperlink.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
-    using System.Collections.Generic;
     using Annotations;
     using Core;
 

src/UglyToad.PdfPig/Content/IPdfImage.cs

@@ -1,12 +1,10 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
-    using System.Collections.Generic;
     using System.Diagnostics.CodeAnalysis;
     using Core;
     using Graphics.Colors;
     using Graphics.Core;
-    using UglyToad.PdfPig.Tokens;
+    using Tokens;
     using XObjects;
 
     /// <summary>

src/UglyToad.PdfPig/Content/IResourceStore.cs

@@ -1,6 +1,5 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System.Collections.Generic;
     using System.Diagnostics.CodeAnalysis;
     using Graphics.Colors;
     using PdfFonts;

src/UglyToad.PdfPig/Content/InlineImage.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
-    using System.Collections.Generic;
     using System.Diagnostics.CodeAnalysis;
     using Core;
     using Filters;

src/UglyToad.PdfPig/Content/MarkedContentElement.cs

@@ -1,9 +1,7 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
-    using System.Collections.Generic;
+    using Graphics;
     using Tokens;
-    using UglyToad.PdfPig.Graphics;
 
     /// <summary>
     /// A marked content element can be used to provide application specific data in the

src/UglyToad.PdfPig/Content/MediaBox.cs

@@ -1,6 +1,5 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
     using Core;
 
     /// <summary>

src/UglyToad.PdfPig/Content/OptionalContentGroupElement.cs

@@ -1,6 +1,4 @@
-using System;
-using System.Collections.Generic;
-using UglyToad.PdfPig.Tokenization.Scanner;
+using UglyToad.PdfPig.Tokenization.Scanner;
 using UglyToad.PdfPig.Tokens;
 
 namespace UglyToad.PdfPig.Content
@@ -151,7 +149,7 @@
         /// </summary>
         public override string ToString()
         {
             return $"{Type} - {Name} [{string.Join(",", Intent)}]: {MarkedContent?.ToString()}";
         }
     }
 }

src/UglyToad.PdfPig/Content/Page.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
-    using System.Collections.Generic;
     using System.Text;
     using System.Linq;
     using Annotations;

src/UglyToad.PdfPig/Content/PageContent.cs

@@ -4,8 +4,6 @@
     using Filters;
     using Graphics;
     using Graphics.Operations;
-    using System;
-    using System.Collections.Generic;
     using Tokenization.Scanner;
     using XObjects;
 

src/UglyToad.PdfPig/Content/PageRotationDegrees.cs

@@ -1,6 +1,5 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
     using System.Globalization;
 
     /// <summary>

src/UglyToad.PdfPig/Content/PageSize.cs

@@ -1,9 +1,7 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System.Collections.Generic;
     using System.Linq;
     using Core;
-    using System;
 
     /// <summary>
     /// The corresponding named size of the <see cref="Page"/>.

src/UglyToad.PdfPig/Content/PageTreeMembers.cs

@@ -2,7 +2,6 @@
 
 namespace UglyToad.PdfPig.Content
 {
-    using System.Collections.Generic;
     using Tokens;
 
     /// <summary>

src/UglyToad.PdfPig/Content/PageTreeNode.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
-    using System.Collections.Generic;
     using Core;
     using Tokens;
 

src/UglyToad.PdfPig/Content/Pages.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
-    using System.Collections.Generic;
     using Core;
     using Filters;
     using Outline.Destinations;

src/UglyToad.PdfPig/Content/PagesFactory.cs

@@ -1,11 +1,9 @@
 namespace UglyToad.PdfPig.Content
 {
+    using System.Linq;
     using Core;
     using Logging;
     using Parser.Parts;
-    using System;
-    using System.Collections.Generic;
-    using System.Linq;
     using Tokenization.Scanner;
     using Tokens;
     using Util;

src/UglyToad.PdfPig/Content/ResourceStore.cs

@@ -1,7 +1,5 @@
 namespace UglyToad.PdfPig.Content
 {
-    using System;
-    using System.Collections.Generic;
     using System.Diagnostics.CodeAnalysis;
     using Core;
     using Graphics.Colors;

src/UglyToad.PdfPig/Content/Word.cs

@@ -1,10 +1,8 @@
 namespace UglyToad.PdfPig.Content
 {
-    using Core;
-    using System;
-    using System.Collections.Generic;
     using System.Linq;
     using System.Text;
+    using Core;
 
     /// <summary>
     /// A word.