Adds Unary length operator

Upsilon/BaseTypes/ScriptString.cs

@@ -6,7 +6,7 @@ using Upsilon.Text;
 
 namespace Upsilon.BaseTypes
 {
-    internal class ScriptString : ScriptType, IIndexable
+    internal class ScriptString : ScriptType, IIndexable, ILengthType
     {
         public ScriptString(string value)
         {
@@ -85,6 +85,11 @@ namespace Upsilon.BaseTypes
             return Value;
         }
 
+        public ScriptNumberLong Length()
+        {
+            return new ScriptNumberLong(Value.Length);
+        }
+
         public ScriptType Get(Diagnostics diagnostics, TextSpan span, ScriptType index, EvaluationScope scope)
         {
             int i;

Upsilon/BaseTypes/ScriptTable.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using Upsilon.BaseTypes.Number;
 using Upsilon.BaseTypes.ScriptTypeInterfaces;
 using Upsilon.Binder;
 using Upsilon.Evaluator;
@@ -8,7 +9,7 @@ using Upsilon.Text;
 
 namespace Upsilon.BaseTypes
 {
-    internal class ScriptTable : ScriptType, IIndexable, IScopeOwner, IIterable
+    internal class ScriptTable : ScriptType, IIndexable, IScopeOwner, IIterable, ILengthType
     {
         public EvaluationScope EvaluationScope { get; }
 
@@ -66,5 +67,10 @@ namespace Upsilon.BaseTypes
                 yield return variable.Key.ToScriptType();
             }
         }
+
+        public ScriptNumberLong Length()
+        {
+            return new ScriptNumberLong(EvaluationScope.Variables.Count);
+        }
     }
 }

Upsilon/BaseTypes/ScriptTypeInterfaces/ILengthType.cs

@@ -0,0 +1,9 @@
+using Upsilon.BaseTypes.Number;
+
+namespace Upsilon.BaseTypes.ScriptTypeInterfaces
+{
+    internal interface ILengthType
+    {
+        ScriptNumberLong Length();
+    }
+}

Upsilon/BaseTypes/UserData/DictionaryUserData.cs

@@ -1,10 +1,13 @@
 using System.Collections;
+using System.Collections.Generic;
+using Upsilon.BaseTypes.Number;
+using Upsilon.BaseTypes.ScriptTypeInterfaces;
 using Upsilon.Evaluator;
 using Upsilon.Text;
 
 namespace Upsilon.BaseTypes.UserData
 {
-    internal class DictionaryUserData : ScriptType, IUserData
+    internal class DictionaryUserData : ScriptType, IUserData, ILengthType
     {
         public IDictionary Dictionary { get; }
 
@@ -47,5 +50,10 @@ namespace Upsilon.BaseTypes.UserData
         {
             return Dictionary.GetType();
         }
+
+        public ScriptNumberLong Length()
+        {
+            return new ScriptNumberLong(Dictionary.Count);
+        }
     }
 }

Upsilon/BaseTypes/UserData/ListUserData.cs

@@ -8,7 +8,7 @@ using Upsilon.Text;
 
 namespace Upsilon.BaseTypes.UserData
 {
-    internal class ListUserData : ScriptType, IUserData, IIterable
+    internal class ListUserData : ScriptType, IUserData, IIterable, ILengthType
     {
         private IList List { get; }
 
@@ -66,5 +66,10 @@ namespace Upsilon.BaseTypes.UserData
                 yield return new ScriptNumberLong(i);
             }
         }
+
+        public ScriptNumberLong Length()
+        {
+            return new ScriptNumberLong(List.Count);
+        }
     }
 }

Upsilon/Binder/BoundUnaryOperator.cs

@@ -11,10 +11,11 @@ namespace Upsilon.Binder
         {
             Identity,
             Negation,
-            LogicalNegation
+            LogicalNegation,
+            Length
         }
 
-        public Type InType { get; }
+        private Type InType { get; }
         public Type OutType { get; }
         public OperatorKind Kind { get; }
 
@@ -25,11 +26,13 @@ namespace Upsilon.Binder
             OutType = outType;
         }
 
-        private static BoundUnaryOperator[] _operators= new BoundUnaryOperator[]
-        {
+        private static readonly BoundUnaryOperator[] Operators= {
             new BoundUnaryOperator(OperatorKind.Identity, Type.Number, Type.Number),
             new BoundUnaryOperator(OperatorKind.Negation, Type.Number, Type.Number),
             new BoundUnaryOperator(OperatorKind.LogicalNegation, Type.Boolean, Type.Boolean),
+            new BoundUnaryOperator(OperatorKind.Length, Type.String, Type.Number),
+            new BoundUnaryOperator(OperatorKind.Length, Type.Table, Type.Number),
+            new BoundUnaryOperator(OperatorKind.Length, Type.UserData, Type.Number),
         };
 
         public static BoundUnaryOperator Bind(SyntaxKind operatorToken, Type inType)
@@ -46,13 +49,16 @@ namespace Upsilon.Binder
                 case SyntaxKind.NotKeyword:
                     kind = OperatorKind.LogicalNegation;
                     break;
+                case SyntaxKind.PoundSign:
+                    kind = OperatorKind.Length;
+                    break;
                 default:
                     throw new Exception("Unknown unary operator token: " + operatorToken);
             }
 
             if (inType == Type.Unknown)
-                return _operators.FirstOrDefault(op => op.Kind == kind);
-            return _operators.FirstOrDefault(op => op.Kind == kind && op.InType == inType);
+                return Operators.FirstOrDefault(op => op.Kind == kind);
+            return Operators.FirstOrDefault(op => op.Kind == kind && op.InType == inType);
         }
     }
 }

Upsilon/Evaluator/Evaluator.cs

@@ -211,7 +211,12 @@ namespace Upsilon.Evaluator
                         return type;
                     }
                     goto default;
-
+                case BoundUnaryOperator.OperatorKind.Length:
+                    if (operand is ILengthType length)
+                    {
+                        return length.Length();
+                    }
+                    goto default;
                 default:
                     throw new Exception("Invalid Unary Operator: " + e.Operator.Kind);
             }

Upsilon/Parser/Lexer.cs

@@ -78,6 +78,8 @@ namespace Upsilon.Parser
                     return new SyntaxToken(SyntaxKind.FullStop, _position, ".", null);
                 case ',':
                     return new SyntaxToken(SyntaxKind.Comma, _position, ",", null);
+                case '#':
+                    return new SyntaxToken(SyntaxKind.PoundSign, _position, "#", null);
                 case '"':
                     return LexString();
                 case '=':

Upsilon/Parser/SyntaxKind.cs

@@ -27,6 +27,7 @@ namespace Upsilon.Parser
         CloseBrace,
         OpenBracket,
         CloseBracket,
+        PoundSign,
 
         // key words
         TrueKeyword,

Upsilon/Parser/SyntaxKindPrecedence.cs

@@ -11,6 +11,7 @@ namespace Upsilon.Parser
             PlusMinus,
             StarSlash,
             Unary,
+            Exponentiation
         }
 
         public static Precedence UnaryOperatorPrecedence(this SyntaxKind kind)
@@ -20,6 +21,7 @@ namespace Upsilon.Parser
                 case SyntaxKind.Plus:
                 case SyntaxKind.Minus:
                 case SyntaxKind.NotKeyword:
+                case SyntaxKind.PoundSign:
                     return Precedence.Unary;
                 default:
                     return Precedence.None;

UpsilonTests/GeneralTests/LengthOperatorTests.cs

@@ -0,0 +1,27 @@
+using Upsilon.Binder;
+using Upsilon.Evaluator;
+using Upsilon.StandardLibraries;
+using Xunit;
+
+namespace UpsilonTests.GeneralTests
+{
+    public class LengthOperatorTests : TestClass
+    {
+        public LengthOperatorTests(StaticScriptFixture fix) : base(fix)
+        {
+        }
+
+        [Theory]
+        [InlineData(@"#""test""", 4)]
+        [InlineData(@"#{100,50,60,7863,1564,12354,10354}", 7)]
+        public void Test(string input, long expectedOutput)
+        {
+            var script = new Script(input, BoundScope, StaticScope);
+            Assert.Empty(script.Diagnostics.Messages);
+            var actual = script.Evaluate<long>();
+            Assert.Empty(script.Diagnostics.Messages);
+            Assert.Equal(expectedOutput, actual);
+        }
+
+    }
+}

UpsilonTests/StandardLibraryTests/BasicFunctionsTests.cs

@@ -26,7 +26,7 @@ namespace UpsilonTests.StandardLibraryTests
         }
 
         [Fact]
-        public void IPairsTest()
+        public void UpTillNilPairsTest()
         {
             const string input = @"
 arr = {100, 56, 28, nil, 100}