Add code

ScriptConverter/Ast/Statements/IfStatement.cs

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+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using ScriptConverter.Ast.Expressions;
+using ScriptConverter.Parser;
+
+namespace ScriptConverter.Ast.Statements
+{
+    class IfStatement : Statement
+    {
+        public class Branch
+        {
+            public Expression Condition { get; private set; }
+            public BlockStatement Block { get; private set; }
+
+            public Branch(Expression condition, BlockStatement block)
+            {
+                Condition = condition;
+                Block = block;
+            }
+        }
+
+        public ReadOnlyCollection<Branch> Branches { get; private set; }
+        public Branch DefaultBranch { get; private set; }
+
+        public IfStatement(ScriptToken start, ScriptToken end, List<Branch> branches, Branch defaultBranch)
+            : base(start, end)
+        {
+            Branches = branches.AsReadOnly();
+            DefaultBranch = defaultBranch;
+        }
+
+        public override TStmt Accept<TDoc, TDecl, TStmt, TExpr>(IAstVisitor<TDoc, TDecl, TStmt, TExpr> visitor)
+        {
+            return visitor.Visit(this);
+        }
+
+        public override void SetParent(Statement parent)
+        {
+            Parent = parent;
+
+            foreach (var branch in Branches)
+            {
+                branch.Condition.SetParent(null);
+                branch.Block.SetParent(this);
+            }
+
+            if (DefaultBranch != null)
+            {
+                DefaultBranch.Block.SetParent(this);
+            }
+        }
+    }
+}