public RazorTagHelperParsingBenchmark()
{
var current = new DirectoryInfo(AppContext.BaseDirectory);
while (current != null && !File.Exists(Path.Combine(current.FullName, "taghelpers.json")))
{
current = current.Parent;
}
var root = current;
var tagHelpers = ReadTagHelpers(Path.Combine(root.FullName, "taghelpers.json"));
var tagHelperFeature = new StaticTagHelperFeature(tagHelpers);
var blazorServerTagHelpersFilePath = Path.Combine(root.FullName, "BlazorServerTagHelpers.razor");
var fileSystem = RazorProjectFileSystem.Create(root.FullName);
ProjectEngine = RazorProjectEngine.Create(RazorConfiguration.Default, fileSystem,
b =>
{
RazorExtensions.Register(b);
b.Features.Add(tagHelperFeature);
});
BlazorServerTagHelpersDemoFile = fileSystem.GetItem(Path.Combine(blazorServerTagHelpersFilePath), FileKinds.Component);
ComponentDirectiveVisitor = new ComponentDirectiveVisitor(blazorServerTagHelpersFilePath, tagHelpers, currentNamespace: null);
var codeDocument = ProjectEngine.ProcessDesignTime(BlazorServerTagHelpersDemoFile);
SyntaxTree = codeDocument.GetSyntaxTree();
}
protected override void ExecuteCore(RazorCodeDocument codeDocument)
{
var syntaxTree = codeDocument.GetSyntaxTree();
ThrowForMissingDocumentDependency(syntaxTree);
var descriptors = codeDocument.GetTagHelpers();
if (descriptors == null)
{
var feature = Engine.GetFeature <ITagHelperFeature>();
if (feature == null)
{
// No feature, nothing to do.
return;
}
descriptors = feature.GetDescriptors();
}
var parserOptions = codeDocument.GetParserOptions();
// We need to find directives in all of the *imports* as well as in the main razor file
//
// The imports come logically before the main razor file and are in the order they
// should be processed.
DirectiveVisitor visitor;
if (FileKinds.IsComponent(codeDocument.GetFileKind()) &&
(parserOptions == null || parserOptions.FeatureFlags.AllowComponentFileKind))
{
codeDocument.TryComputeNamespace(fallbackToRootNamespace: true, out var currentNamespace);
visitor = new ComponentDirectiveVisitor(codeDocument.Source.FilePath, descriptors, currentNamespace);
}
else
{
visitor = new TagHelperDirectiveVisitor(descriptors);
}
var imports = codeDocument.GetImportSyntaxTrees();
if (imports != null)
{
for (var i = 0; i < imports.Count; i++)
{
var import = imports[i];
visitor.Visit(import);
}
}
visitor.Visit(syntaxTree);
// This will always be null for a component document.
var tagHelperPrefix = visitor.TagHelperPrefix;
descriptors = visitor.Matches.ToArray();
var context = TagHelperDocumentContext.Create(tagHelperPrefix, descriptors);
codeDocument.SetTagHelperContext(context);
if (descriptors.Count == 0)
{
// No descriptors, no-op.
return;
}
var rewrittenSyntaxTree = TagHelperParseTreeRewriter.Rewrite(syntaxTree, tagHelperPrefix, descriptors);
codeDocument.SetSyntaxTree(rewrittenSyntaxTree);
}
public void TagHelper_ComponentDirectiveVisitor()
{
ComponentDirectiveVisitor.Visit(SyntaxTree);
}
