private static void AppendAllLoadedSyntaxTrees(
            ArrayBuilder <SyntaxTree> treesBuilder,
            SyntaxTree tree,
            string scriptClassName,
            SourceReferenceResolver resolver,
            Language language,
            bool isSubmission,
            IDictionary <SyntaxTree, int> ordinalMapBuilder,
            IDictionary <SyntaxTree, ImmutableArray <DeclarationLoadDirective> > loadDirectiveMapBuilder,
            IDictionary <string, SyntaxTree> loadedSyntaxTreeMapBuilder,
            IDictionary <SyntaxTree, Lazy <RootSingleDeclaration> > declMapBuilder,
            ref DeclarationTable declTable)
        {
            ArrayBuilder <DeclarationLoadDirective> loadDirectives = null;

            foreach (var d in tree.GetCompilationUnitRoot().GetLoadDirectives())
            {
                var directive = (LoadDirective)d.Directive;
                var node      = (LanguageSyntaxNode)d;
                var path      = directive.File;
                if (path == null)
                {
                    // If there is no path, the parser should have some Diagnostics to report (if we're in an active region).
                    Debug.Assert(!directive.IsActive || tree.GetDiagnostics().Any(diag => diag.Severity == DiagnosticSeverity.Error));
                    continue;
                }

                var    diagnostics      = DiagnosticBag.GetInstance();
                string resolvedFilePath = null;
                if (resolver == null)
                {
                    diagnostics.Add(InternalErrorCode.ERR_SourceFileReferencesNotSupported.ToDiagnosticInfo().ToDiagnostic(node.Location));
                }
                else
                {
                    resolvedFilePath = resolver.ResolveReference(path, baseFilePath: tree.FilePath);
                    if (resolvedFilePath == null)
                    {
                        diagnostics.Add(InternalErrorCode.ERR_NoSourceFile.ToDiagnosticInfo(path).ToDiagnostic(node.Location));
                    }
                    else if (!loadedSyntaxTreeMapBuilder.ContainsKey(resolvedFilePath))
                    {
                        try
                        {
                            var code       = resolver.ReadText(resolvedFilePath);
                            var loadedTree = language.SyntaxFactory.ParseSyntaxTree(
                                code,
                                tree.Options, // Use ParseOptions propagated from "external" tree.
                                resolvedFilePath);

                            // All #load'ed trees should have unique path information.
                            loadedSyntaxTreeMapBuilder.Add(loadedTree.FilePath, loadedTree);

                            AppendAllSyntaxTrees(
                                treesBuilder,
                                loadedTree,
                                scriptClassName,
                                resolver,
                                language,
                                isSubmission,
                                ordinalMapBuilder,
                                loadDirectiveMapBuilder,
                                loadedSyntaxTreeMapBuilder,
                                declMapBuilder,
                                ref declTable);
                        }
                        catch (Exception e)
                        {
                            diagnostics.Add(ModelErrorCode.ERR_FileReadError.ToDiagnosticInfo(resolvedFilePath, e).ToDiagnostic(node.Location));
                        }
                    }
                    else
                    {
                        // The path resolved, but we've seen this file before,
                        // so don't attempt to load it again.
                        Debug.Assert(diagnostics.IsEmptyWithoutResolution);
                    }
                }

                if (loadDirectives == null)
                {
                    loadDirectives = ArrayBuilder <DeclarationLoadDirective> .GetInstance();
                }
                loadDirectives.Add(new DeclarationLoadDirective(resolvedFilePath, diagnostics.ToReadOnlyAndFree()));
            }

            if (loadDirectives != null)
            {
                loadDirectiveMapBuilder.Add(tree, loadDirectives.ToImmutableAndFree());
            }
        }
        private static void AppendAllLoadedSyntaxTrees(
            ArrayBuilder<SyntaxTree> treesBuilder,
            SyntaxTree tree,
            string scriptClassName,
            SourceReferenceResolver resolver,
            CommonMessageProvider messageProvider,
            bool isSubmission,
            IDictionary<SyntaxTree, int> ordinalMapBuilder,
            IDictionary<SyntaxTree, ImmutableArray<LoadDirective>> loadDirectiveMapBuilder,
            IDictionary<string, SyntaxTree> loadedSyntaxTreeMapBuilder,
            IDictionary<SyntaxTree, Lazy<RootSingleNamespaceDeclaration>> declMapBuilder,
            ref DeclarationTable declTable)
        {
            ArrayBuilder<LoadDirective> loadDirectives = null;

            foreach (var directive in tree.GetCompilationUnitRoot().GetLoadDirectives())
            {
                var fileToken = directive.File;
                var path = (string)fileToken.Value;
                if (path == null)
                {
                    // If there is no path, the parser should have some Diagnostics to report (if we're in an active region).
                    Debug.Assert(!directive.IsActive || tree.GetDiagnostics().Any(d => d.Severity == DiagnosticSeverity.Error));
                    continue;
                }

                var diagnostics = DiagnosticBag.GetInstance();
                string resolvedFilePath = null;
                if (resolver == null)
                {
                    diagnostics.Add(
                        messageProvider.CreateDiagnostic(
                            (int)ErrorCode.ERR_SourceFileReferencesNotSupported,
                            directive.Location));
                }
                else
                {
                    resolvedFilePath = resolver.ResolveReference(path, baseFilePath: tree.FilePath);
                    if (resolvedFilePath == null)
                    {
                        diagnostics.Add(
                            messageProvider.CreateDiagnostic(
                                (int)ErrorCode.ERR_NoSourceFile,
                                fileToken.GetLocation(),
                                path,
                                CSharpResources.CouldNotFindFile));
                    }
                    else if (!loadedSyntaxTreeMapBuilder.ContainsKey(resolvedFilePath))
                    {
                        try
                        {
                            var code = resolver.ReadText(resolvedFilePath);
                            var loadedTree = SyntaxFactory.ParseSyntaxTree(
                                code,
                                tree.Options, // Use ParseOptions propagated from "external" tree.
                                resolvedFilePath);

                            // All #load'ed trees should have unique path information.
                            loadedSyntaxTreeMapBuilder.Add(loadedTree.FilePath, loadedTree);

                            AppendAllSyntaxTrees(
                                treesBuilder,
                                loadedTree,
                                scriptClassName,
                                resolver,
                                messageProvider,
                                isSubmission,
                                ordinalMapBuilder,
                                loadDirectiveMapBuilder,
                                loadedSyntaxTreeMapBuilder,
                                declMapBuilder,
                                ref declTable);
                        }
                        catch (Exception e)
                        {
                            diagnostics.Add(
                                CommonCompiler.ToFileReadDiagnostics(messageProvider, e, resolvedFilePath),
                                fileToken.GetLocation());
                        }
                    }
                    else
                    {
                        // The path resolved, but we've seen this file before,
                        // so don't attempt to load it again.
                        Debug.Assert(diagnostics.IsEmptyWithoutResolution);
                    }
                }

                if (loadDirectives == null)
                {
                    loadDirectives = ArrayBuilder<LoadDirective>.GetInstance();
                }
                loadDirectives.Add(new LoadDirective(resolvedFilePath, diagnostics.ToReadOnlyAndFree()));
            }

            if (loadDirectives != null)
            {
                loadDirectiveMapBuilder.Add(tree, loadDirectives.ToImmutableAndFree());
            }
        }
        private static void AppendAllLoadedSyntaxTrees(
            ArrayBuilder <SyntaxTree> treesBuilder,
            SyntaxTree tree,
            string scriptClassName,
            SourceReferenceResolver resolver,
            CommonMessageProvider messageProvider,
            bool isSubmission,
            IDictionary <SyntaxTree, int> ordinalMapBuilder,
            IDictionary <SyntaxTree, ImmutableArray <LoadDirective> > loadDirectiveMapBuilder,
            IDictionary <string, SyntaxTree> loadedSyntaxTreeMapBuilder,
            IDictionary <SyntaxTree, Lazy <RootSingleNamespaceDeclaration> > declMapBuilder,
            ref DeclarationTable declTable)
        {
            ArrayBuilder <LoadDirective> loadDirectives = null;

            foreach (var directive in tree.GetCompilationUnitRoot().GetLoadDirectives())
            {
                var fileToken = directive.File;
                var path      = (string)fileToken.Value;
                if (path == null)
                {
                    // If there is no path, the parser should have some Diagnostics to report.
                    Debug.Assert(tree.GetDiagnostics().Any(d => d.Severity == DiagnosticSeverity.Error));
                    continue;
                }

                var    diagnostics      = DiagnosticBag.GetInstance();
                string resolvedFilePath = null;
                if (resolver == null)
                {
                    diagnostics.Add(
                        messageProvider.CreateDiagnostic(
                            (int)ErrorCode.ERR_SourceFileReferencesNotSupported,
                            directive.Location));
                }
                else
                {
                    resolvedFilePath = resolver.ResolveReference(path, baseFilePath: tree.FilePath);
                    if (resolvedFilePath == null)
                    {
                        diagnostics.Add(
                            messageProvider.CreateDiagnostic(
                                (int)ErrorCode.ERR_NoSourceFile,
                                fileToken.GetLocation(),
                                path,
                                CSharpResources.CouldNotFindFile));
                    }
                    else if (!loadedSyntaxTreeMapBuilder.ContainsKey(resolvedFilePath))
                    {
                        try
                        {
                            var code       = resolver.ReadText(resolvedFilePath);
                            var loadedTree = SyntaxFactory.ParseSyntaxTree(
                                code,
                                tree.Options, // Use ParseOptions propagated from "external" tree.
                                resolvedFilePath);

                            // All #load'ed trees should have unique path information.
                            loadedSyntaxTreeMapBuilder.Add(loadedTree.FilePath, loadedTree);

                            AppendAllSyntaxTrees(
                                treesBuilder,
                                loadedTree,
                                scriptClassName,
                                resolver,
                                messageProvider,
                                isSubmission,
                                ordinalMapBuilder,
                                loadDirectiveMapBuilder,
                                loadedSyntaxTreeMapBuilder,
                                declMapBuilder,
                                ref declTable);
                        }
                        catch (Exception e)
                        {
                            diagnostics.Add(
                                CommonCompiler.ToFileReadDiagnostics(messageProvider, e, resolvedFilePath),
                                fileToken.GetLocation());
                        }
                    }
                    else
                    {
                        // The path resolved, but we've seen this file before,
                        // so don't attempt to load it again.
                        Debug.Assert(diagnostics.IsEmptyWithoutResolution);
                    }
                }

                if (loadDirectives == null)
                {
                    loadDirectives = ArrayBuilder <LoadDirective> .GetInstance();
                }
                loadDirectives.Add(new LoadDirective(resolvedFilePath, diagnostics.ToReadOnlyAndFree()));
            }

            if (loadDirectives != null)
            {
                loadDirectiveMapBuilder.Add(tree, loadDirectives.ToImmutableAndFree());
            }
        }