Track nullability in script code

src/Compilers/CSharp/Portable/Binder/BinderFactory.cs

@@ -105,7 +105,7 @@ internal Binder GetBinder(SyntaxNode node, CSharpSyntaxNode memberDeclarationOpt
             // Unless this is interactive retrieving a binder for global statements
             // at the very top-level (i.e. in a completely empty file) use
             // node.Parent to maintain existing behavior.
-            if (!InScript || node.Kind() != SyntaxKind.CompilationUnit)
+            if ((!InScript || node.Kind() != SyntaxKind.CompilationUnit) && node.Parent != null)
             {
                 node = node.Parent;
             }

src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker.cs

@@ -306,7 +306,7 @@ internal static void Analyze(
             DiagnosticBag diagnostics,
             Action<BoundExpression, TypeWithAnnotations> callbackOpt = null)
         {
-            if (method.IsImplicitlyDeclared && (!method.IsImplicitConstructor || method.ContainingType.IsImplicitlyDeclared))
+            if (method.IsImplicitlyDeclared && !method.IsImplicitConstructor && !method.IsScriptInitializer)
             {
                 return;
             }

src/Scripting/CSharp/CSharpScriptCompiler.cs

@@ -11,7 +11,7 @@ internal sealed class CSharpScriptCompiler : ScriptCompiler
     {
         public static readonly ScriptCompiler Instance = new CSharpScriptCompiler();
 
-        private static readonly CSharpParseOptions s_defaultOptions = new CSharpParseOptions(kind: SourceCodeKind.Script, languageVersion: LanguageVersion.Latest);
+        internal static readonly CSharpParseOptions DefaultParseOptions = new CSharpParseOptions(kind: SourceCodeKind.Script, languageVersion: LanguageVersion.Latest);
 
         private CSharpScriptCompiler()
         {
@@ -23,8 +23,8 @@ private CSharpScriptCompiler()
 
         public override bool IsCompleteSubmission(SyntaxTree tree) => SyntaxFactory.IsCompleteSubmission(tree);
 
-        public override SyntaxTree ParseSubmission(SourceText text, CancellationToken cancellationToken) =>
-            SyntaxFactory.ParseSyntaxTree(text, s_defaultOptions, cancellationToken: cancellationToken);
+        public override SyntaxTree ParseSubmission(SourceText text, ParseOptions parseOptions, CancellationToken cancellationToken) =>
+            SyntaxFactory.ParseSyntaxTree(text, parseOptions ?? DefaultParseOptions, cancellationToken: cancellationToken);
 
         public override Compilation CreateSubmission(Script script)
         {
@@ -40,7 +40,7 @@ public override Compilation CreateSubmission(Script script)
             // TODO: report diagnostics
             diagnostics.Free();
 
-            var tree = SyntaxFactory.ParseSyntaxTree(script.SourceText, s_defaultOptions, script.Options.FilePath);
+            var tree = SyntaxFactory.ParseSyntaxTree(script.SourceText, script.Options.ParseOptions ?? DefaultParseOptions, script.Options.FilePath);
 
             string assemblyName, submissionTypeName;
             script.Builder.GenerateSubmissionId(out assemblyName, out submissionTypeName);

src/Scripting/CSharp/PublicAPI.Unshipped.txt

@@ -1 +1,2 @@
-
+Microsoft.CodeAnalysis.CSharp.Scripting.ScriptOptionsExtensions
+static Microsoft.CodeAnalysis.CSharp.Scripting.ScriptOptionsExtensions.WithLanguageVersion(this Microsoft.CodeAnalysis.Scripting.ScriptOptions options, Microsoft.CodeAnalysis.CSharp.LanguageVersion languageVersion) -> Microsoft.CodeAnalysis.Scripting.ScriptOptions

src/Scripting/CSharp/ScriptOptionsExtensions.cs

@@ -0,0 +1,19 @@
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+
+using System;
+using Microsoft.CodeAnalysis.Scripting;
+
+namespace Microsoft.CodeAnalysis.CSharp.Scripting
+{
+    public static class ScriptOptionsExtensions
+    {
+        public static ScriptOptions WithLanguageVersion(this ScriptOptions options, LanguageVersion languageVersion)
+        {
+            var parseOptions = (options.ParseOptions is null)
+                ? CSharpScriptCompiler.DefaultParseOptions
+                : (options.ParseOptions is CSharpParseOptions existing) ? existing : throw new InvalidOperationException(string.Format(ScriptingResources.CannotSetLanguageSpecificOption, LanguageNames.CSharp, nameof(LanguageVersion)));
+
+            return options.WithParseOptions(parseOptions.WithLanguageVersion(languageVersion));
+        }
+    }
+}

src/Scripting/CSharpTest/ScriptOptionsTests.cs

@@ -0,0 +1,36 @@
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+
+using System;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Scripting;
+using Microsoft.CodeAnalysis.Scripting;
+using Microsoft.CodeAnalysis.VisualBasic;
+using Roslyn.Test.Utilities;
+using Xunit;
+
+namespace Microsoft.CodeAnalysis.CSharp.Scripting.UnitTests
+{
+    public class ScriptOptionsTests : TestBase
+    {
+        [Fact]
+        public void WithLanguageVersion()
+        {
+            var options = ScriptOptions.Default.WithLanguageVersion(LanguageVersion.CSharp8);
+            Assert.Equal(LanguageVersion.CSharp8, ((CSharpParseOptions)options.ParseOptions).LanguageVersion);
+        }
+
+        [Fact]
+        public void WithLanguageVersion_SameValueTwice_DoesNotCreateNewInstance()
+        {
+            var options = ScriptOptions.Default.WithLanguageVersion(LanguageVersion.CSharp8);
+            Assert.Same(options, options.WithLanguageVersion(LanguageVersion.CSharp8));
+        }
+
+        [Fact]
+        public void WithLanguageVersion_NonCSharpParseOptions_Throws()
+        {
+            var options = ScriptOptions.Default.WithParseOptions(new VisualBasicParseOptions(kind: SourceCodeKind.Script, languageVersion: VisualBasic.LanguageVersion.Latest));
+            Assert.Throws<InvalidOperationException>(() => options.WithLanguageVersion(LanguageVersion.CSharp8));
+        }
+    }
+}

src/Scripting/CSharpTest/ScriptTests.cs

@@ -923,6 +923,31 @@ public void StreamWithOffset()
             ScriptingTestHelpers.EvaluateScriptWithOutput(script, "Hello World!");
         }
 
+        [Fact]
+        public void CreateScriptWithFeatureThatIsNotSupportedInTheSelectedLanguageVersion()
+        {
+            var script = CSharpScript.Create(@"string x = default;", ScriptOptions.Default.WithLanguageVersion(LanguageVersion.CSharp7));
+            var compilation = script.GetCompilation();
+
+            compilation.VerifyDiagnostics(
+                Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion7, "default").
+                    WithArguments("default literal", "7.1").
+                    WithLocation(1, 12)
+            );
+        }
+
+        [Fact]
+        public void CreateScriptWithNullableContextWithCSharp8()
+        {
+            var script = CSharpScript.Create(@"#nullable enable
+                string x = null;", ScriptOptions.Default.WithLanguageVersion(LanguageVersion.CSharp8));
+            var compilation = script.GetCompilation();
+
+            compilation.VerifyDiagnostics(
+                Diagnostic(ErrorCode.WRN_NullAsNonNullable, "null").WithLocation(2, 28)
+            );
+        }
+
         private class StreamOffsetResolver : SourceReferenceResolver
         {
             public override bool Equals(object other) => ReferenceEquals(this, other);

src/Scripting/Core/Hosting/CommandLine/CommandLineRunner.cs

@@ -159,7 +159,8 @@ private static ScriptOptions GetScriptOptions(CommandLineArguments arguments, st
                 optimizationLevel: OptimizationLevel.Debug,
                 allowUnsafe: true,
                 checkOverflow: false,
-                warningLevel: 4);
+                warningLevel: 4,
+                parseOptions: null);
         }
 
         internal static MetadataReferenceResolver GetMetadataReferenceResolver(CommandLineArguments arguments, TouchedFileLogger loggerOpt)
@@ -239,7 +240,7 @@ private void RunInteractiveLoop(ScriptOptions options, string initialScriptCodeO
 
                     input.AppendLine(line);
 
-                    var tree = _scriptCompiler.ParseSubmission(SourceText.From(input.ToString()), cancellationToken);
+                    var tree = _scriptCompiler.ParseSubmission(SourceText.From(input.ToString()), options.ParseOptions, cancellationToken);
                     if (_scriptCompiler.IsCompleteSubmission(tree))
                     {
                         break;

src/Scripting/Core/ScriptCompiler.cs

@@ -13,7 +13,7 @@ internal abstract class ScriptCompiler
         public abstract DiagnosticFormatter DiagnosticFormatter { get; }
         public abstract StringComparer IdentifierComparer { get; }
 
-        public abstract SyntaxTree ParseSubmission(SourceText text, CancellationToken cancellationToken);
+        public abstract SyntaxTree ParseSubmission(SourceText text, ParseOptions parseOptions, CancellationToken cancellationToken);
         public abstract bool IsCompleteSubmission(SyntaxTree tree);
     }
 }

src/Scripting/Core/ScriptOptions.cs

@@ -30,7 +30,8 @@ public sealed class ScriptOptions
             OptimizationLevel.Debug,
             checkOverflow: false,
             allowUnsafe: true,
-            warningLevel: 4);
+            warningLevel: 4,
+            parseOptions: null);
 
         private static ImmutableArray<MetadataReference> GetDefaultMetadataReferences()
         {
@@ -134,6 +135,8 @@ private static ImmutableArray<MetadataReference> GetDefaultMetadataReferences()
         /// </summary>
         public int WarningLevel { get; private set; }
 
+        internal ParseOptions ParseOptions { get; private set; }
+
         internal ScriptOptions(
             string filePath,
             ImmutableArray<MetadataReference> references,
@@ -145,7 +148,8 @@ internal ScriptOptions(
             OptimizationLevel optimizationLevel,
             bool checkOverflow,
             bool allowUnsafe,
-            int warningLevel)
+            int warningLevel,
+            ParseOptions parseOptions)
         {
             Debug.Assert(filePath != null);
             Debug.Assert(!references.IsDefault);
@@ -164,6 +168,7 @@ internal ScriptOptions(
             CheckOverflow = checkOverflow;
             AllowUnsafe = allowUnsafe;
             WarningLevel = warningLevel;
+            ParseOptions = parseOptions;
         }
 
         private ScriptOptions(ScriptOptions other)
@@ -177,7 +182,8 @@ private ScriptOptions(ScriptOptions other)
                    optimizationLevel: other.OptimizationLevel,
                    checkOverflow: other.CheckOverflow,
                    allowUnsafe: other.AllowUnsafe,
-                   warningLevel: other.WarningLevel)
+                   warningLevel: other.WarningLevel,
+                   parseOptions: other.ParseOptions)
         {
         }
 
@@ -375,5 +381,8 @@ public ScriptOptions WithCheckOverflow(bool checkOverflow) =>
         /// </summary>
         public ScriptOptions WithWarningLevel(int warningLevel) =>
             warningLevel == WarningLevel ? this : new ScriptOptions(this) { WarningLevel = warningLevel };
+
+        internal ScriptOptions WithParseOptions(ParseOptions parseOptions) =>
+            parseOptions == ParseOptions ? this : new ScriptOptions(this) { ParseOptions = parseOptions };
     }
 }

src/Scripting/Core/ScriptingResources.resx

@@ -187,4 +187,7 @@ Script directives:
   <data name="AssemblyAlreadyLoadedNotSigned" xml:space="preserve">
     <value>Assembly '{0}' has already been loaded from '{1}'. A different assembly with the same name can't be loaded unless it's signed: '{2}'.</value>
   </data>
+  <data name="CannotSetLanguageSpecificOption" xml:space="preserve">
+    <value>Cannot set {0} specific option {1} because the options were already configured for a different language.</value>
+  </data>
 </root>

src/Scripting/Core/xlf/ScriptingResources.cs.xlf

@@ -2,6 +2,11 @@
 <xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
   <file datatype="xml" source-language="en" target-language="cs" original="../ScriptingResources.resx">
     <body>
+      <trans-unit id="CannotSetLanguageSpecificOption">
+        <source>Cannot set {0} specific option {1} because the options were already configured for a different language.</source>
+        <target state="new">Cannot set {0} specific option {1} because the options were already configured for a different language.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="StackOverflowWhileEvaluating">
         <source>!&lt;Stack overflow while evaluating object&gt;</source>
         <target state="translated">!&lt;Přetečení zásobníku během vyhodnocování objektu&gt;</target>

src/Scripting/Core/xlf/ScriptingResources.de.xlf

@@ -2,6 +2,11 @@
 <xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
   <file datatype="xml" source-language="en" target-language="de" original="../ScriptingResources.resx">
     <body>
+      <trans-unit id="CannotSetLanguageSpecificOption">
+        <source>Cannot set {0} specific option {1} because the options were already configured for a different language.</source>
+        <target state="new">Cannot set {0} specific option {1} because the options were already configured for a different language.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="StackOverflowWhileEvaluating">
         <source>!&lt;Stack overflow while evaluating object&gt;</source>
         <target state="translated">!&lt;Stapelüberlauf beim Auswerten des Objekts.&gt;</target>

src/Scripting/Core/xlf/ScriptingResources.es.xlf

@@ -2,6 +2,11 @@
 <xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
   <file datatype="xml" source-language="en" target-language="es" original="../ScriptingResources.resx">
     <body>
+      <trans-unit id="CannotSetLanguageSpecificOption">
+        <source>Cannot set {0} specific option {1} because the options were already configured for a different language.</source>
+        <target state="new">Cannot set {0} specific option {1} because the options were already configured for a different language.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="StackOverflowWhileEvaluating">
         <source>!&lt;Stack overflow while evaluating object&gt;</source>
         <target state="translated">!&lt;Desbordamiento de pila al evaluar objeto&gt;</target>

src/Scripting/Core/xlf/ScriptingResources.fr.xlf

@@ -2,6 +2,11 @@
 <xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
   <file datatype="xml" source-language="en" target-language="fr" original="../ScriptingResources.resx">
     <body>
+      <trans-unit id="CannotSetLanguageSpecificOption">
+        <source>Cannot set {0} specific option {1} because the options were already configured for a different language.</source>
+        <target state="new">Cannot set {0} specific option {1} because the options were already configured for a different language.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="StackOverflowWhileEvaluating">
         <source>!&lt;Stack overflow while evaluating object&gt;</source>
         <target state="translated">!&lt;Dépassement de capacité de la pile durant l'évaluation de l'objet&gt;</target>

src/Scripting/Core/xlf/ScriptingResources.it.xlf

@@ -2,6 +2,11 @@
 <xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
   <file datatype="xml" source-language="en" target-language="it" original="../ScriptingResources.resx">
     <body>
+      <trans-unit id="CannotSetLanguageSpecificOption">
+        <source>Cannot set {0} specific option {1} because the options were already configured for a different language.</source>
+        <target state="new">Cannot set {0} specific option {1} because the options were already configured for a different language.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="StackOverflowWhileEvaluating">
         <source>!&lt;Stack overflow while evaluating object&gt;</source>
         <target state="translated">!&lt;Overflow dello stack durante la valutazione dell'oggetto&gt;</target>

src/Scripting/Core/xlf/ScriptingResources.ja.xlf

@@ -2,6 +2,11 @@
 <xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
   <file datatype="xml" source-language="en" target-language="ja" original="../ScriptingResources.resx">
     <body>
+      <trans-unit id="CannotSetLanguageSpecificOption">
+        <source>Cannot set {0} specific option {1} because the options were already configured for a different language.</source>
+        <target state="new">Cannot set {0} specific option {1} because the options were already configured for a different language.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="StackOverflowWhileEvaluating">
         <source>!&lt;Stack overflow while evaluating object&gt;</source>
         <target state="translated">!&lt;オブジェクトの評価中にスタック オーバーフローが発生しました&gt;</target>