+ Adjusted StatementBuilder to conditionally use bindings

+ Added Binding.cs
+ Added initial variable binding implementation to Sphere.cs

OSCADSharp/OSCADSharp.UnitTests/Solids/SphereTests.cs

@@ -127,9 +127,10 @@ namespace OSCADSharp.UnitTests
 
             var sphere = new Sphere();
             sphere.Bind("Radius", Variables.Global["mySphereRadius"]);
+            Assert.IsTrue(sphere.Radius == radius);
 
             string script = sphere.ToString();
-           // Assert.IsTrue(script.Contains("r = mySphereRadius"));
+            Assert.IsTrue(script.Contains("r = mySphereRadius"));
         }
     }
 }

OSCADSharp/OSCADSharp/OSCADSharp.csproj

@@ -48,7 +48,7 @@
     <Compile Include="Files\IFileInvoker.cs" />
     <Compile Include="Files\IFileWriter.cs" />
     <Compile Include="Ids.cs" />
-    <Compile Include="Scripting\BindingMapper.cs" />
+    <Compile Include="Scripting\Binding.cs" />
     <Compile Include="Scripting\Bindings.cs" />
     <Compile Include="Scripting\IBindable.cs" />
     <Compile Include="Scripting\SingleStatementObject.cs" />

OSCADSharp/OSCADSharp/Scripting/Binding.cs

@@ -6,10 +6,9 @@ using System.Threading.Tasks;
 
 namespace OSCADSharp.Scripting
 {
-    internal class BindingMapper
+    internal class Binding
     {
         public string OpenSCADFieldName { get; set; }
-        public List<string> BindingOptions { get; set; }
+        public Variable BoundVariable { get; set; }
-        public Dictionary<string, Func<object, string>> BindingTransformers { get; set; }
     }
 }

OSCADSharp/OSCADSharp/Scripting/Bindings.cs

@@ -8,12 +8,20 @@ namespace OSCADSharp.Scripting
 {
     internal class Bindings
     {
-        internal List<BindingMapper> Mappers { get; set; } = new List<BindingMapper>();
+        private Dictionary<string, Binding> bindings = new Dictionary<string, Binding>();
-
+        internal void Add(Binding binding)
-        private Dictionary<string, Variable> bindings = new Dictionary<string, Variable>();
-        internal void Add(string property, Variable variable)
         {
-            bindings[property] = variable;
+            bindings[binding.OpenSCADFieldName] = binding;
+        }
+
+        internal bool Contains(string property)
+        {
+            return bindings.ContainsKey(property);
+        }
+
+        internal Binding Get(string property)
+        {
+            return bindings[property];
         }
     }
 }

OSCADSharp/OSCADSharp/Scripting/StatementBuilder.cs

@@ -13,6 +13,18 @@ namespace OSCADSharp.Scripting
     internal class StatementBuilder
     {
         private StringBuilder SB { get; set; } = new StringBuilder();
+        private Bindings bindings; 
+
+        internal StatementBuilder()
+        {
+            this.bindings = new Bindings();
+        }
+
+        internal StatementBuilder(Bindings bindings)
+        {
+            this.bindings = bindings;
+        }
+
 
         /// <summary>
         /// Special append method for conditionally adding value-pairs
@@ -22,6 +34,8 @@ namespace OSCADSharp.Scripting
         /// <param name="prefixWithComma">(optional) Flag indicating whether a comma should be added before the value-pair</param>
         public void AppendValuePairIfExists(string name, object value, bool prefixWithComma = false)
         {
+            bool useBinding = this.shouldUseBinding(name);
+
             if (!String.IsNullOrEmpty(value?.ToString()))
             {
                 if (prefixWithComma)
@@ -31,10 +45,23 @@ namespace OSCADSharp.Scripting
 
                 SB.Append(name);
                 SB.Append(" = ");
-                SB.Append(value);
+
+                if(useBinding)
+                {
+                    SB.Append(this.bindings.Get(name).BoundVariable.Name);
+                }
+                else
+                {
+                    SB.Append(value);
+                }
             }
         }
 
+        private bool shouldUseBinding(string name)
+        {
+            return this.bindings.Contains(name);
+        }
+
         /// <summary>
         /// Pass-through for StringBuilder.Append
         /// </summary>

OSCADSharp/OSCADSharp/Solids/Sphere.cs

@@ -5,6 +5,7 @@ using System.Text;
 using System.Threading.Tasks;
 using OSCADSharp.Spatial;
 using OSCADSharp.Scripting;
+using System.Collections.Concurrent;
 
 namespace OSCADSharp.Solids
 {
@@ -71,7 +72,7 @@ namespace OSCADSharp.Solids
         /// <returns>Script for this object</returns>
         public override string ToString()
         {
-            StatementBuilder sb = new StatementBuilder();
+            StatementBuilder sb = new StatementBuilder(this.bindings);
             sb.Append("sphere(");
             sb.AppendValuePairIfExists("r", this.Radius);
             sb.AppendValuePairIfExists("$fn", this.Resolution, true);
@@ -120,6 +121,11 @@ namespace OSCADSharp.Solids
         }
 
         private Bindings bindings = new Bindings();
+        private static Dictionary<string, string> bindingMapping = new Dictionary<string, string>()
+        {
+            { "radius", "r" }
+        };
+
         /// <summary>
         /// Binds a a variable to a property on this object
         /// </summary>
@@ -128,7 +134,31 @@ namespace OSCADSharp.Solids
         /// literal value of the property</param>
         public void Bind(string property, Variable variable)
         {
-            this.bindings.Add(property, variable);
+
+            string lowercaseProp = property.ToLower();
+            if (!bindingMapping.ContainsKey(lowercaseProp))
+            {
+                throw new KeyNotFoundException(String.Format("No bindable property matching the name {0} was found"));
+            }
+
+            //Set value of property to variable value
+            this.setValueForBinding(lowercaseProp, variable);
+
+            //Assign mapping r -> radius -> variable
+            var binding = new Binding()
+            {
+                OpenSCADFieldName = bindingMapping[lowercaseProp],
+                BoundVariable = variable
+            };
+
+            this.bindings.Add(binding);           
+        }
+
+        private void setValueForBinding(string property, Variable variable)
+        {
+            if (property == "radius") {
+                this.Radius = Convert.ToDouble(variable.Value);
+            }
         }
         #endregion
     }