agileobjects · SteveWilkes · Aug 3, 2019 · Aug 3, 2019 · Aug 3, 2019 · Aug 3, 2019
diff --git a/AgileMapper.PerformanceTester.Net45/AgileMapper.PerformanceTester.Net45.csproj b/AgileMapper.PerformanceTester.Net45/AgileMapper.PerformanceTester.Net45.csproj
@@ -37,8 +37,8 @@
     <Reference Include="AgileObjects.NetStandardPolyfills, Version=1.4.0.0, Culture=neutral, PublicKeyToken=06131ac1c008ad4e, processorArchitecture=MSIL">
       <HintPath>..\packages\AgileObjects.NetStandardPolyfills.1.4.0\lib\net40\AgileObjects.NetStandardPolyfills.dll</HintPath>
     </Reference>
-    <Reference Include="AgileObjects.ReadableExpressions, Version=2.3.1.0, Culture=neutral, PublicKeyToken=9f54ad81db69da8e, processorArchitecture=MSIL">
-      <HintPath>..\packages\AgileObjects.ReadableExpressions.2.3.1\lib\net40\AgileObjects.ReadableExpressions.dll</HintPath>
+    <Reference Include="AgileObjects.ReadableExpressions, Version=2.3.2.0, Culture=neutral, PublicKeyToken=9f54ad81db69da8e, processorArchitecture=MSIL">
+      <HintPath>..\packages\AgileObjects.ReadableExpressions.2.3.2\lib\net40\AgileObjects.ReadableExpressions.dll</HintPath>
     </Reference>
     <Reference Include="AutoMapper, Version=7.0.1.0, Culture=neutral, PublicKeyToken=be96cd2c38ef1005, processorArchitecture=MSIL">
       <HintPath>..\packages\AutoMapper.7.0.1\lib\net45\AutoMapper.dll</HintPath>

diff --git a/AgileMapper.PerformanceTester.Net45/packages.config b/AgileMapper.PerformanceTester.Net45/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="AgileObjects.NetStandardPolyfills" version="1.4.0" targetFramework="net452" />
-  <package id="AgileObjects.ReadableExpressions" version="2.3.1" targetFramework="net452" />
+  <package id="AgileObjects.ReadableExpressions" version="2.3.2" targetFramework="net452" />
   <package id="AutoMapper" version="7.0.1" targetFramework="net452" />
   <package id="Expressmapper" version="1.9.1" targetFramework="net452" />
   <package id="Mapster" version="3.3.1" targetFramework="net452" />

diff --git a/AgileMapper.UnitTests.Net35/AgileMapper.UnitTests.Net35.csproj b/AgileMapper.UnitTests.Net35/AgileMapper.UnitTests.Net35.csproj
@@ -37,8 +37,8 @@
     <Reference Include="AgileObjects.NetStandardPolyfills, Version=1.4.0.0, Culture=neutral, PublicKeyToken=06131ac1c008ad4e, processorArchitecture=MSIL">
       <HintPath>..\packages\AgileObjects.NetStandardPolyfills.1.4.0\lib\net35\AgileObjects.NetStandardPolyfills.dll</HintPath>
     </Reference>
-    <Reference Include="AgileObjects.ReadableExpressions, Version=2.3.1.0, Culture=neutral, PublicKeyToken=9f54ad81db69da8e, processorArchitecture=MSIL">
-      <HintPath>..\packages\AgileObjects.ReadableExpressions.2.3.1\lib\net35\AgileObjects.ReadableExpressions.dll</HintPath>
+    <Reference Include="AgileObjects.ReadableExpressions, Version=2.3.2.0, Culture=neutral, PublicKeyToken=9f54ad81db69da8e, processorArchitecture=MSIL">
+      <HintPath>..\packages\AgileObjects.ReadableExpressions.2.3.2\lib\net35\AgileObjects.ReadableExpressions.dll</HintPath>
     </Reference>
     <Reference Include="Microsoft.Dynamic, Version=1.1.2.22, Culture=neutral, PublicKeyToken=7f709c5b713576e1, processorArchitecture=MSIL">
       <HintPath>..\packages\DynamicLanguageRuntime.1.1.2\lib\Net35\Microsoft.Dynamic.dll</HintPath>

diff --git a/AgileMapper.UnitTests.Net35/packages.config b/AgileMapper.UnitTests.Net35/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="AgileObjects.NetStandardPolyfills" version="1.4.0" targetFramework="net35" />
-  <package id="AgileObjects.ReadableExpressions" version="2.3.1" targetFramework="net35" />
+  <package id="AgileObjects.ReadableExpressions" version="2.3.2" targetFramework="net35" />
   <package id="DynamicLanguageRuntime" version="1.1.2" targetFramework="net35" />
   <package id="NUnit" version="3.6.1" targetFramework="net35" />
   <package id="NUnit3TestAdapter" version="3.10.0" targetFramework="net35" />

diff --git a/AgileMapper.UnitTests.NonParallel/AgileMapper.UnitTests.NonParallel.csproj b/AgileMapper.UnitTests.NonParallel/AgileMapper.UnitTests.NonParallel.csproj
@@ -42,8 +42,8 @@
     <Reference Include="AgileObjects.NetStandardPolyfills, Version=1.4.0.0, Culture=neutral, PublicKeyToken=06131ac1c008ad4e, processorArchitecture=MSIL">
       <HintPath>..\packages\AgileObjects.NetStandardPolyfills.1.4.0\lib\net40\AgileObjects.NetStandardPolyfills.dll</HintPath>
     </Reference>
-    <Reference Include="AgileObjects.ReadableExpressions, Version=2.3.1.0, Culture=neutral, PublicKeyToken=9f54ad81db69da8e, processorArchitecture=MSIL">
-      <HintPath>..\packages\AgileObjects.ReadableExpressions.2.3.1\lib\net40\AgileObjects.ReadableExpressions.dll</HintPath>
+    <Reference Include="AgileObjects.ReadableExpressions, Version=2.3.2.0, Culture=neutral, PublicKeyToken=9f54ad81db69da8e, processorArchitecture=MSIL">
+      <HintPath>..\packages\AgileObjects.ReadableExpressions.2.3.2\lib\net40\AgileObjects.ReadableExpressions.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />

diff --git a/AgileMapper.UnitTests.NonParallel/packages.config b/AgileMapper.UnitTests.NonParallel/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="AgileObjects.NetStandardPolyfills" version="1.4.0" targetFramework="net461" />
-  <package id="AgileObjects.ReadableExpressions" version="2.3.1" targetFramework="net461" />
+  <package id="AgileObjects.ReadableExpressions" version="2.3.2" targetFramework="net461" />
   <package id="xunit" version="2.4.1" targetFramework="net461" />
   <package id="xunit.abstractions" version="2.0.3" targetFramework="net461" />
   <package id="xunit.analyzers" version="0.10.0" targetFramework="net461" />

diff --git a/AgileMapper.UnitTests/AgileMapper.UnitTests.csproj b/AgileMapper.UnitTests/AgileMapper.UnitTests.csproj
@@ -44,8 +44,8 @@
     <Reference Include="AgileObjects.NetStandardPolyfills, Version=1.4.0.0, Culture=neutral, PublicKeyToken=06131ac1c008ad4e, processorArchitecture=MSIL">
       <HintPath>..\packages\AgileObjects.NetStandardPolyfills.1.4.0\lib\net40\AgileObjects.NetStandardPolyfills.dll</HintPath>
     </Reference>
-    <Reference Include="AgileObjects.ReadableExpressions, Version=2.3.1.0, Culture=neutral, PublicKeyToken=9f54ad81db69da8e, processorArchitecture=MSIL">
-      <HintPath>..\packages\AgileObjects.ReadableExpressions.2.3.1\lib\net40\AgileObjects.ReadableExpressions.dll</HintPath>
+    <Reference Include="AgileObjects.ReadableExpressions, Version=2.3.2.0, Culture=neutral, PublicKeyToken=9f54ad81db69da8e, processorArchitecture=MSIL">
+      <HintPath>..\packages\AgileObjects.ReadableExpressions.2.3.2\lib\net40\AgileObjects.ReadableExpressions.dll</HintPath>
     </Reference>
     <Reference Include="Microsoft.Extensions.Primitives, Version=2.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
       <HintPath>..\packages\Microsoft.Extensions.Primitives.2.0.0\lib\netstandard2.0\Microsoft.Extensions.Primitives.dll</HintPath>

diff --git a/AgileMapper.UnitTests/packages.config b/AgileMapper.UnitTests/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="AgileObjects.NetStandardPolyfills" version="1.4.0" targetFramework="net461" />
-  <package id="AgileObjects.ReadableExpressions" version="2.3.1" targetFramework="net461" />
+  <package id="AgileObjects.ReadableExpressions" version="2.3.2" targetFramework="net461" />
   <package id="Microsoft.Extensions.Primitives" version="2.0.0" targetFramework="net461" />
   <package id="System.Runtime.CompilerServices.Unsafe" version="4.5.2" targetFramework="net461" />
   <package id="xunit" version="2.4.1" targetFramework="net461" />

diff --git a/AgileMapper/AgileMapper.csproj b/AgileMapper/AgileMapper.csproj
@@ -30,7 +30,7 @@
 
   <ItemGroup>
     <PackageReference Include="AgileObjects.NetStandardPolyfills" Version="1.4.0" />
-    <PackageReference Include="AgileObjects.ReadableExpressions" Version="2.3.1" />
+    <PackageReference Include="AgileObjects.ReadableExpressions" Version="2.3.2" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net35'">

diff --git a/AgileMapper/Api/Configuration/Dictionaries/DictionaryMappingConfigurator.cs b/AgileMapper/Api/Configuration/Dictionaries/DictionaryMappingConfigurator.cs
@@ -17,12 +17,9 @@ internal class DictionaryMappingConfigurator<TValue> :
         ISourceDynamicTargetTypeSelector
 #endif
     {
-        private readonly MappingConfigInfo _configInfo;
-
         internal DictionaryMappingConfigurator(MappingConfigInfo configInfo)
             : base(configInfo)
         {
-            _configInfo = configInfo;
         }
 
         #region Mapping Settings
@@ -102,24 +99,24 @@ private DictionaryMappingConfigurator<TValue> RegisterElementKeyPattern(
 
         private MappingConfigInfo GetConfigInfo(DictionaryContext context)
         {
-            return (_configInfo.TargetType != typeof(object))
-                ? _configInfo.Copy().Set(context)
+            return (ConfigInfo.TargetType != typeof(object))
+                ? ConfigInfo.Copy().Set(context)
                 : GetGlobalConfigInfo(context);
         }
 
         private MappingConfigInfo GetGlobalConfigInfo(DictionaryContext context)
-            => _configInfo.Copy().ForAllRuleSets().ForAllTargetTypes().Set(context);
+            => ConfigInfo.Copy().ForAllRuleSets().ForAllTargetTypes().Set(context);
 
         #region AndWhenMapping
 
         MappingConfigStartingPoint IGlobalDictionarySettings<TValue>.AndWhenMapping
-            => new MappingConfigStartingPoint(_configInfo.MapperContext);
+            => new MappingConfigStartingPoint(ConfigInfo.MapperContext);
 
         public ISourceDictionaryTargetTypeSelector<TValue> AndWhenMapping => this;
 
 #if FEATURE_DYNAMIC
         MappingConfigStartingPoint IGlobalDynamicSettings.AndWhenMapping
-            => new MappingConfigStartingPoint(_configInfo.MapperContext);
+            => new MappingConfigStartingPoint(ConfigInfo.MapperContext);
 
         ISourceDynamicTargetTypeSelector ISourceDynamicSettings.AndWhenMapping => this;
 #endif
@@ -130,7 +127,7 @@ MappingConfigStartingPoint IGlobalDynamicSettings.AndWhenMapping
         #region Dictionaries
 
         public ISourceDictionaryMappingConfigurator<TValue, TTarget> To<TTarget>()
-            => CreateDictionaryConfigurator<TTarget>(_configInfo.ForAllRuleSets());
+            => CreateDictionaryConfigurator<TTarget>(ConfigInfo.ForAllRuleSets());
 
         public ISourceDictionaryMappingConfigurator<TValue, TTarget> ToANew<TTarget>()
             => CreateDictionaryConfigurator<TTarget>(Constants.CreateNew);
@@ -143,7 +140,7 @@ public ISourceDictionaryMappingConfigurator<TValue, TTarget> Over<TTarget>()
 
         private SourceDictionaryMappingConfigurator<TValue, TTarget> CreateDictionaryConfigurator<TTarget>(
             string ruleSetName)
-            => CreateDictionaryConfigurator<TTarget>(_configInfo.ForRuleSet(ruleSetName));
+            => CreateDictionaryConfigurator<TTarget>(ConfigInfo.ForRuleSet(ruleSetName));
 
         private static SourceDictionaryMappingConfigurator<TValue, TTarget> CreateDictionaryConfigurator<TTarget>(
             MappingConfigInfo configInfo)
@@ -155,7 +152,7 @@ private static SourceDictionaryMappingConfigurator<TValue, TTarget> CreateDictio
         #region Dynamics
 
         ISourceDynamicMappingConfigurator<TTarget> ISourceDynamicTargetTypeSelector.To<TTarget>()
-            => CreateDynamicConfigurator<TTarget>(_configInfo.ForAllRuleSets());
+            => CreateDynamicConfigurator<TTarget>(ConfigInfo.ForAllRuleSets());
 
         ISourceDynamicMappingConfigurator<TTarget> ISourceDynamicTargetTypeSelector.ToANew<TTarget>()
             => CreateDynamicConfigurator<TTarget>(Constants.CreateNew);
@@ -168,7 +165,7 @@ ISourceDynamicMappingConfigurator<TTarget> ISourceDynamicTargetTypeSelector.Over
 
         private SourceDynamicMappingConfigurator<TTarget> CreateDynamicConfigurator<TTarget>(
             string ruleSetName)
-            => CreateDynamicConfigurator<TTarget>(_configInfo.ForRuleSet(ruleSetName));
+            => CreateDynamicConfigurator<TTarget>(ConfigInfo.ForRuleSet(ruleSetName));
 
         private static SourceDynamicMappingConfigurator<TTarget> CreateDynamicConfigurator<TTarget>(
             MappingConfigInfo configInfo)

diff --git a/AgileMapper/Api/Configuration/Dictionaries/TargetDictionaryMappingConfigurator.cs b/AgileMapper/Api/Configuration/Dictionaries/TargetDictionaryMappingConfigurator.cs
@@ -52,7 +52,7 @@ public ICustomTargetDictionaryKeySpecifier<TSource, TValue> MapMember<TSourceMem
 
         private QualifiedMember GetSourceMemberOrThrow(LambdaExpression lambda)
         {
-            var sourceMember = lambda.Body.ToSourceMember(ConfigInfo.MapperContext);
+            var sourceMember = lambda.Body.ToSourceMember(MapperContext);
 
             if (sourceMember != null)
             {

diff --git a/AgileMapper/Api/Configuration/Dynamics/TargetDynamicMappingConfigurator.cs b/AgileMapper/Api/Configuration/Dynamics/TargetDynamicMappingConfigurator.cs
@@ -57,7 +57,7 @@ public ICustomTargetDynamicMemberNameSpecifier<TSource> MapMember<TSourceMember>
 
         private QualifiedMember GetSourceMemberOrThrow(LambdaExpression lambda)
         {
-            var sourceMember = lambda.Body.ToSourceMember(ConfigInfo.MapperContext);
+            var sourceMember = lambda.Body.ToSourceMember(MapperContext);
 
             if (sourceMember != null)
             {

diff --git a/AgileMapper/Api/Configuration/MappingConfigurator.cs b/AgileMapper/Api/Configuration/MappingConfigurator.cs
@@ -37,6 +37,8 @@ public MappingConfigurator(MappingConfigInfo configInfo)
 
         protected MapperContext MapperContext => ConfigInfo.MapperContext;
 
+        private UserConfigurationSet UserConfigurations => MapperContext.UserConfigurations;
+
         #region IFullMappingInlineConfigurator Members
 
         public MappingConfigStartingPoint WhenMapping
@@ -96,7 +98,7 @@ public IFullProjectionInlineConfigurator<TSource, TTarget> RecurseToDepth(int re
         {
             var depthSettings = new RecursionDepthSettings(ConfigInfo, recursionDepth);
 
-            ConfigInfo.MapperContext.UserConfigurations.Add(depthSettings);
+            UserConfigurations.Add(depthSettings);
             return this;
         }
 
@@ -213,7 +215,7 @@ private FactorySpecifier<TSource, TTarget, TObject> CreateFactorySpecifier<TObje
 
         public IFullMappingSettings<TSource, TTarget> PassExceptionsTo(Action<IMappingExceptionData<TSource, TTarget>> callback)
         {
-            MapperContext.UserConfigurations.Add(new ExceptionCallback(ConfigInfo, callback.ToConstantExpression()));
+            UserConfigurations.Add(new ExceptionCallback(ConfigInfo, callback.ToConstantExpression()));
             return this;
         }
 
@@ -223,13 +225,13 @@ public IFullMappingSettings<TSource, TTarget> PassExceptionsTo(Action<IMappingEx
 
         private IFullMappingSettings<TSource, TTarget> SetMappedObjectCaching(bool cache)
         {
-            MapperContext.UserConfigurations.Add(new MappedObjectCachingSetting(ConfigInfo, cache));
+            UserConfigurations.Add(new MappedObjectCachingSetting(ConfigInfo, cache));
             return this;
         }
 
         public IFullMappingSettings<TSource, TTarget> MapNullCollectionsToNull()
         {
-            MapperContext.UserConfigurations.Add(new NullCollectionsSetting(ConfigInfo));
+            UserConfigurations.Add(new NullCollectionsSetting(ConfigInfo));
             return this;
         }
 
@@ -239,7 +241,7 @@ public IFullMappingSettings<TSource, TTarget> MapNullCollectionsToNull()
 
         private IFullMappingSettings<TSource, TTarget> SetEntityKeyMapping(bool mapKeys)
         {
-            MapperContext.UserConfigurations.Add(new EntityKeyMappingSetting(ConfigInfo, mapKeys));
+            UserConfigurations.Add(new EntityKeyMappingSetting(ConfigInfo, mapKeys));
             return this;
         }
 
@@ -251,7 +253,7 @@ public IFullMappingSettings<TSource, TTarget> DoNotAutoReverseConfiguredDataSour
 
         private IFullMappingSettings<TSource, TTarget> SetDataSourceReversal(bool reverse)
         {
-            MapperContext.UserConfigurations.Add(new DataSourceReversalSetting(ConfigInfo, reverse));
+            UserConfigurations.Add(new DataSourceReversalSetting(ConfigInfo, reverse));
             return this;
         }
 
@@ -299,7 +301,7 @@ private MappingConfigContinuation<TSource, TTarget> IgnoreMembersByFilter(
 #else
             var configuredIgnoredMember = new ConfiguredIgnoredMember(ConfigInfo, memberFilter);
 #endif
-            MapperContext.UserConfigurations.Add(configuredIgnoredMember);
+            UserConfigurations.Add(configuredIgnoredMember);
 
             return new MappingConfigContinuation<TSource, TTarget>(ConfigInfo);
         }
@@ -323,7 +325,7 @@ private MappingConfigContinuation<TSource, TTarget> IgnoreMembers(
 #else
                 var configuredIgnoredMember = new ConfiguredIgnoredMember(ConfigInfo, targetMember);
 #endif
-                MapperContext.UserConfigurations.Add(configuredIgnoredMember);
+                UserConfigurations.Add(configuredIgnoredMember);
                 ConfigInfo.NegateCondition();
             }
 
@@ -461,7 +463,7 @@ private MappingConfigContinuation<TSource, TTarget> RegisterMapToNullCondition()
         {
             var condition = new MapToNullCondition(ConfigInfo);
 
-            MapperContext.UserConfigurations.Add(condition);
+            UserConfigurations.Add(condition);
 
             return new MappingConfigContinuation<TSource, TTarget>(ConfigInfo);
         }

diff --git a/AgileMapper/Configuration/ConfiguredIgnoredMember.cs b/AgileMapper/Configuration/ConfiguredIgnoredMember.cs
@@ -1,14 +1,14 @@
 namespace AgileObjects.AgileMapper.Configuration
 {
     using System;
-    using DataSources;
-    using Members;
-    using ReadableExpressions;
 #if NET35
     using Microsoft.Scripting.Ast;
 #else
     using System.Linq.Expressions;
 #endif
+    using DataSources;
+    using Members;
+    using ReadableExpressions;
 
     internal class ConfiguredIgnoredMember :
         UserConfiguredItemBase,

diff --git a/AgileMapper/Configuration/MappingConfigInfo.cs b/AgileMapper/Configuration/MappingConfigInfo.cs
@@ -17,7 +17,7 @@
 
     internal class MappingConfigInfo : ITypePair
     {
-        private static readonly MappingRuleSet _allRuleSets = new MappingRuleSet("*", null, null, null, null, null, null);
+        private static readonly MappingRuleSet _allRuleSets = new MappingRuleSet("*");
 
         public static readonly MappingConfigInfo AllRuleSetsSourceTypesAndTargetTypes =
             AllRuleSetsAndSourceTypes(null).ForAllTargetTypes();

diff --git a/AgileMapper/Configuration/MemberSelector.cs b/AgileMapper/Configuration/MemberSelector.cs
@@ -7,7 +7,7 @@ namespace AgileObjects.AgileMapper.Configuration
     using NetStandardPolyfills;
 
     /// <summary>
-    /// Provides a fluent interface to select members by their characteristics.
+    /// Provides a fluent interface to select target members by their characteristics.
     /// </summary>
     public class TargetMemberSelector
     {

diff --git a/AgileMapper/Constants.cs b/AgileMapper/Constants.cs
@@ -3,13 +3,13 @@
     using System;
     using System.Collections.Generic;
     using System.Linq;
-    using Extensions.Internal;
-    using NetStandardPolyfills;
 #if NET35
     using Microsoft.Scripting.Ast;
 #else
     using System.Linq.Expressions;
 #endif
+    using Extensions.Internal;
+    using NetStandardPolyfills;
 
     internal static class Constants
     {
@@ -23,13 +23,13 @@ internal static class Constants
 
         public static readonly Expression EmptyExpression = Expression.Empty();
 
-        public const string CreateNew = "CreateNew";
+        public const string CreateNew = nameof(CreateNew);
 
-        public const string Merge = "Merge";
+        public const string Merge = nameof(Merge);
 
-        public const string Overwrite = "Overwrite";
+        public const string Overwrite = nameof(Overwrite);
 
-        public const string Project = "Project";
+        public const string Project = nameof(Project);
 
         public const int BeforeLoopExitCheck = 0;
 
@@ -57,7 +57,7 @@ internal static class Constants
             typeof(ulong)
         };
 
-        public static readonly Type[] NumericTypes = WholeNumberNumericTypes
+        public static readonly IList<Type> NumericTypes = WholeNumberNumericTypes
             .Append(new[] { typeof(float), typeof(decimal), typeof(double) });
 
         public static readonly IDictionary<Type, double> NumericTypeMaxValuesByType = GetValuesByType("MaxValue");

diff --git a/AgileMapper/DataSources/ConfiguredDataSource.cs b/AgileMapper/DataSources/ConfiguredDataSource.cs
@@ -1,12 +1,12 @@
 namespace AgileObjects.AgileMapper.DataSources
 {
-    using Extensions.Internal;
-    using Members;
 #if NET35
     using Microsoft.Scripting.Ast;
 #else
     using System.Linq.Expressions;
 #endif
+    using Extensions.Internal;
+    using Members;
 
     internal class ConfiguredDataSource : DataSourceBase, IConfiguredDataSource
     {

diff --git a/AgileMapper/DataSources/DataSourceBase.cs b/AgileMapper/DataSources/DataSourceBase.cs
@@ -185,6 +185,8 @@ private static bool IsNotOptionalEntityMemberId(IMemberMapperData mapperData)
 
         public bool IsConditional => Condition != null;
 
+        public virtual bool IsFallback => false;
+
         public virtual Expression Condition { get; }
 
         public ICollection<ParameterExpression> Variables { get; }