Rewrite the C++ Demangler (#416)

* Rewrite the C++ Demangler

This new Demangler provides support to almost every possible mangled
symbols and should behaves like GNU c++filt.

It works on 98.9% of the sdk's symbols and 99.5%
of Puyo Puyo Tetris's symbols.

* Fix code style

* Fix noexcept enclosed expression parsing issues

* fix code style issues

1 files changed, 29 insertions, 0 deletions

diff --git a/Ryujinx.HLE/HOS/Diagnostics/Demangler/Ast/ConditionalExpression.cs b/Ryujinx.HLE/HOS/Diagnostics/Demangler/Ast/ConditionalExpression.cs
new file mode 100644
index 00000000..17ac7c1a
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Diagnostics/Demangler/Ast/ConditionalExpression.cs
@@ -0,0 +1,29 @@
+using System.IO;
+
+namespace Ryujinx.HLE.HOS.Diagnostics.Demangler.Ast
+{
+    public class ConditionalExpression : BaseNode
+    {
+        private BaseNode ThenNode;
+        private BaseNode ElseNode;
+        private BaseNode ConditionNode;
+
+        public ConditionalExpression(BaseNode ConditionNode, BaseNode ThenNode, BaseNode ElseNode) : base(NodeType.ConditionalExpression)
+        {
+            this.ThenNode      = ThenNode;
+            this.ConditionNode = ConditionNode;
+            this.ElseNode      = ElseNode;
+        }
+
+        public override void PrintLeft(TextWriter Writer)
+        {
+            Writer.Write("(");
+            ConditionNode.Print(Writer);
+            Writer.Write(") ? (");
+            ThenNode.Print(Writer);
+            Writer.Write(") : (");
+            ElseNode.Print(Writer);
+            Writer.Write(")");
+        }
+    }
+}
\ No newline at end of file