Simplified the logic for indentation by using numbers.

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using CppSharp.AST;
@@ -11,17 +10,15 @@ namespace CppSharp.Generators.CSharp
 {
     public class CSharpMarshalContext : MarshalContext
     {
-        public CSharpMarshalContext(BindingContext context, Stack<uint> indentation)
+        public CSharpMarshalContext(BindingContext context, uint indentation)
             : base(context, indentation)
         {
-            ArgumentPrefix = new TextGenerator();
-            indentation.PushTo(ArgumentPrefix.CurrentIndentation);
-            Cleanup = new TextGenerator();
-            indentation.PushTo(Cleanup.CurrentIndentation);
+            ArgumentPrefix = new TextGenerator { CurrentIndentation = indentation };
+            Cleanup = new TextGenerator { CurrentIndentation = indentation };
         }
 
-        public TextGenerator ArgumentPrefix { get; private set; }
-        public TextGenerator Cleanup { get; private set; }
+        public TextGenerator ArgumentPrefix { get; }
+        public TextGenerator Cleanup { get; }
         public bool HasCodeBlock { get; set; }
     }
 

src/Generator/Generators/Marshal.cs

@@ -1,17 +1,14 @@
 using CppSharp.AST;
-using System.Collections.Generic;
 
 namespace CppSharp.Generators
 {
     public class MarshalContext : TypePrinter
     {
-        public MarshalContext(BindingContext context, Stack<uint> indentation)
+        public MarshalContext(BindingContext context, uint indentation)
         {
             Context = context;
-            Before = new TextGenerator();
-            indentation.PushTo(Before.CurrentIndentation);
-            Return = new TextGenerator();
-            indentation.PushTo(Return.CurrentIndentation);
+            Before = new TextGenerator { CurrentIndentation = indentation };
+            Return = new TextGenerator { CurrentIndentation = indentation };
             MarshalVarPrefix = string.Empty;
             this.Indentation = indentation;
         }
@@ -31,7 +28,7 @@ namespace CppSharp.Generators
         public Function Function { get; set; }
 
         public string MarshalVarPrefix { get; set; }
-        public Stack<uint> Indentation { get; }
+        public uint Indentation { get; }
     }
 
     public abstract class MarshalPrinter<T> : AstVisitor where T : MarshalContext

src/Generator/Utils/BlockGenerator.cs

@@ -240,7 +240,7 @@ namespace CppSharp
     {
         public Block RootBlock { get; }
         public Block ActiveBlock { get; private set; }
-        public Stack<uint> CurrentIndentation => ActiveBlock.Text.CurrentIndentation;
+        public uint CurrentIndentation => ActiveBlock.Text.CurrentIndentation;
 
         protected BlockGenerator()
         {
@@ -263,7 +263,7 @@ namespace CppSharp
         public void PushBlock(BlockKind kind = BlockKind.Unknown, object obj = null)
         {
             var block = new Block { Kind = kind, Object = obj };
-            CurrentIndentation.PushTo(block.Text.CurrentIndentation);
+            block.Text.CurrentIndentation = CurrentIndentation;
             block.Text.IsStartOfLine = ActiveBlock.Text.IsStartOfLine;
             block.Text.NeedsNewLine = ActiveBlock.Text.NeedsNewLine;
             PushBlock(block);

src/Generator/Utils/TextGenerator.cs

@@ -1,6 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Text;
 
 namespace CppSharp
@@ -27,7 +25,7 @@ namespace CppSharp
         public StringBuilder StringBuilder = new StringBuilder();
         public bool IsStartOfLine { get; set; }
         public bool NeedsNewLine { get; set; }
-        public Stack<uint> CurrentIndentation { get; } = new Stack<uint>();
+        public uint CurrentIndentation { get; set; }
 
         public TextGenerator()
         {
@@ -38,7 +36,7 @@ namespace CppSharp
             StringBuilder = new StringBuilder(generator);
             IsStartOfLine = generator.IsStartOfLine;
             NeedsNewLine = generator.NeedsNewLine;
-            CurrentIndentation = new Stack<uint>(generator.CurrentIndentation);
+            CurrentIndentation = generator.CurrentIndentation;
         }
 
         public TextGenerator Clone()
@@ -55,7 +53,8 @@ namespace CppSharp
                 msg = string.Format(msg, args);
 
             if (IsStartOfLine && !string.IsNullOrWhiteSpace(msg))
-                StringBuilder.Append(new string(' ', (int) CurrentIndentation.Sum(u => u)));
+                StringBuilder.Append(new string(' ',
+                    (int) (CurrentIndentation * DefaultIndentation)));
 
             if (msg.Length > 0)
                 IsStartOfLine = msg.EndsWith(Environment.NewLine);
@@ -100,14 +99,14 @@ namespace CppSharp
             NeedsNewLine = false;
         }
 
-        public void Indent(uint indentation = DefaultIndentation)
+        public void Indent(uint indentation = 1)
         {
-            CurrentIndentation.Push(indentation);
+            CurrentIndentation++;
         }
 
         public void Unindent()
         {
-            CurrentIndentation.Pop();
+            CurrentIndentation--;
         }
 
         public void WriteOpenBraceAndIndent()

src/Generator/Utils/Utils.cs

@@ -128,17 +128,4 @@ namespace CppSharp
             return uri1.MakeRelativeUri(uri2).ToString();
         }
     }
-
-    public static class CollectionExtensions
-    {
-        public static void PushTo<T>(this Stack<T> source, Stack<T> destination)
-        {
-            var array = new T[source.Count];
-            source.CopyTo(array, 0);
-            foreach (var element in array.Reverse())
-            {
-                destination.Push(element);
-            }
-        }
-    }
 }