Better error handling

Upsilon/BaseTypes/ScriptFunction/ScriptMethodInfoFunction.cs

@@ -107,7 +107,7 @@ namespace Upsilon.BaseTypes.ScriptFunction
                     // if we haven't found a method, we throw an exception
                     if (method == null)
                     {
-                        throw new ScriptRuntimeException(
+                        throw new ScriptRuntimeException(script.FileName,
                             $"Can't find method {Method.Name} with parameter types {string.Join(", ", convertedTypes.Select(x => x.Name))} on type {_object.GetType().Name}",
                             span, diagnostics.ScriptString.GetSpan(span));
                     }

Upsilon/BaseTypes/ScriptFunction/ScriptRuntimeFunction.cs

@@ -6,6 +6,7 @@ using Upsilon.BaseTypes.ScriptTypeInterfaces;
 using Upsilon.Binder;
 using Upsilon.Binder.VariableSymbols;
 using Upsilon.Evaluator;
+using Upsilon.Exceptions;
 using Upsilon.Text;
 
 namespace Upsilon.BaseTypes.ScriptFunction
@@ -25,7 +26,7 @@ namespace Upsilon.BaseTypes.ScriptFunction
             var option = GetValidOption(variables);
             if (option == null)
             {
-                throw new EvaluationException(
+                throw new EvaluationException(script.FileName,
                     $"No valid function found");
             }
             return option.Run(diagnostics, variables, script, scope, span);

Upsilon/BaseTypes/UserData/ListUserData.cs

@@ -64,7 +64,7 @@ namespace Upsilon.BaseTypes.UserData
             }
             else
             {
-                throw new ScriptRuntimeException(
+                throw new ScriptRuntimeException(null,
                     $"Tried indexing a CSharp list with a value that's not an integer. Value: {scriptIndex.ToCSharpObject()}",
                     span, diagnostics.ScriptString.GetSpan(span));
             }

Upsilon/Binder/Binder.cs

@@ -375,6 +375,8 @@ namespace Upsilon.Binder
                         {
                             return new UserDataVariableSymbol(fullStopIndexExpression.Index, boundDef, true, parent);
                         }
+                        diagnostics?.LogWarning($"Can't resolve type '{bDefProperty.ToString()}'", fullStopIndexExpression.Span);
+                        return new VariableSymbol(fullStopIndexExpression.Index, Type.Unknown, true);
                     }
                 }
                 else if (indexerVariable.TypeContainer == Type.Unknown)
@@ -887,14 +889,16 @@ namespace Upsilon.Binder
                     }
                     else
                     {
-                        var functionParameter = (UserDataVariableSymbol) variableSymbol;
+                        if (variableSymbol is UserDataVariableSymbol functionParameter)
-                        var udBoundDef = (UserDataBoundTypeDefinition)functionParameter.BoundTypeDefinition;
-                        if (udBoundDef.Properties.TryGetValue(index.ToLowerInvariant(), out var property))
                         {
-                            return new BoundFullStopIndexExpression(expression, index, property.Type, e.Span);
+                            var udBoundDef = (UserDataBoundTypeDefinition)functionParameter.BoundTypeDefinition;
+                            if (udBoundDef.Properties.TryGetValue(index.ToLowerInvariant(), out var property))
+                            {
+                                return new BoundFullStopIndexExpression(expression, index, property.Type, e.Span);
+                            }
+                            _diagnostics.LogError($"No variable '{index}' found on type '{udBoundDef.Name}'.",
+                                e.Span);
                         }
-                        _diagnostics.LogError($"No variable '{index}' found on type '{udBoundDef.Name}'.",
-                            e.Span);
                     }
                     return new BoundFullStopIndexExpression(expression, index, Type.Unknown, e.Span);
                 case Type.Unknown:

Upsilon/Evaluator/EvaluationException.cs

@@ -1,12 +0,0 @@
-using System;
-
-namespace Upsilon.Evaluator
-{
-    public class EvaluationException : Exception
-    {
-        public EvaluationException(string message) : base(message)
-        {
-
-        }
-    }
-}

Upsilon/Evaluator/Evaluator.cs

@@ -88,7 +88,7 @@ namespace Upsilon.Evaluator
             var function = (ScriptRuntimeFunction) statement;
             var option = function.GetValidOption(parameters);
             if (option == null)
-                throw new EvaluationException(
+                throw new EvaluationException(_script.FileName,
                     $"No function found with name '{functionName}' and available parameters {string.Join(", ", parameters.Select(x => $"{x.GetType().Name}"))}");
 
             var result = option.Run(_diagnostics, parameters?.Select(x => x.ToScriptType()).ToArray(), _script, Scope, new TextSpan());
@@ -399,7 +399,7 @@ namespace Upsilon.Evaluator
 
         private void ThrowException(string message, TextSpan location)
         {
-            throw new ScriptRuntimeException(message, location, _diagnostics.ScriptString.GetSpan(location));
+            throw new ScriptRuntimeException(_script.FileName, message, location, _diagnostics.ScriptString.GetSpan(location));
         }
 
         private void EvaluateAssignmentStatement(BoundVariableAssignment e)

Upsilon/Exceptions/EvaluationException.cs

@@ -0,0 +1,23 @@
+using System;
+
+namespace Upsilon.Exceptions
+{
+    public class EvaluationException : Exception
+    {
+        public string FileName { get; }
+        public string ErrorMessage { get; }
+
+        public EvaluationException(string fileName, string message)
+        {
+            FileName = fileName;
+            ErrorMessage = message;
+        }
+
+        public override string ToString()
+        {
+            return $"[{FileName}] {ErrorMessage}";
+        }
+
+        public override string Message => ToString();
+    }
+}

Upsilon/Exceptions/ScriptRuntimeException.cs

@@ -5,13 +5,15 @@ namespace Upsilon.Exceptions
 {
     public class ScriptRuntimeException : Exception
     {
+        public string FileName { get; }
         public string ErrorMessage { get; }
         public int    Line         { get; }
         public int    Character    { get; }
         public string ErrorLine    { get; }
 
-        public ScriptRuntimeException(string errorMessage, TextSpan position, string errorLine)
+        public ScriptRuntimeException(string fileName, string errorMessage, TextSpan position, string errorLine)
         {
+            FileName = fileName;
             ErrorMessage = errorMessage;
             Line         = position.StartLine;
             Character    = position.StartPosition;
@@ -20,7 +22,7 @@ namespace Upsilon.Exceptions
 
         public override string ToString()
         {
-            return $"{ErrorMessage} at ({Line}, {Character})\n{ErrorLine}";
+            return $"[{FileName}] {ErrorMessage} at ({Line}, {Character})\n{ErrorLine}";
         }
 
         public override string Message => ToString();