public static RazorParserFeatureFlags Create(RazorLanguageVersion version, string fileKind)
{
if (fileKind == null)
{
throw new ArgumentNullException(nameof(fileKind));
}
var allowMinimizedBooleanTagHelperAttributes = false;
var allowHtmlCommentsInTagHelpers = false;
var allowComponentFileKind = false;
var allowRazorInAllCodeBlocks = false;
var allowUsingVariableDeclarations = false;
var allowConditionalDataDashAttributes = false;
var allowCSharpInMarkupAttributeArea = true;
var allowNullableForgivenessOperator = false;
if (version.CompareTo(RazorLanguageVersion.Version_2_1) >= 0)
{
// Added in 2.1
allowMinimizedBooleanTagHelperAttributes = true;
allowHtmlCommentsInTagHelpers = true;
}
if (version.CompareTo(RazorLanguageVersion.Version_3_0) >= 0)
{
// Added in 3.0
allowComponentFileKind = true;
allowRazorInAllCodeBlocks = true;
allowUsingVariableDeclarations = true;
allowNullableForgivenessOperator = true;
}
if (FileKinds.IsComponent(fileKind))
{
allowConditionalDataDashAttributes = true;
allowCSharpInMarkupAttributeArea = false;
}
if (version.CompareTo(RazorLanguageVersion.Experimental) >= 0)
{
allowConditionalDataDashAttributes = true;
}
return(new DefaultRazorParserFeatureFlags(
allowMinimizedBooleanTagHelperAttributes,
allowHtmlCommentsInTagHelpers,
allowComponentFileKind,
allowRazorInAllCodeBlocks,
allowUsingVariableDeclarations,
allowConditionalDataDashAttributes,
allowCSharpInMarkupAttributeArea,
allowNullableForgivenessOperator));
}
public RazorSyntaxTree Execute(RazorCodeDocument codeDocument, RazorSyntaxTree syntaxTree)
{
if (FileKinds.IsComponent(codeDocument.GetFileKind()))
{
// Nothing to do here.
return(syntaxTree);
}
var sectionVerifier = new NestedSectionVerifier(syntaxTree);
return(sectionVerifier.Verify());
}
protected override void ExecuteCore(RazorCodeDocument codeDocument)
{
var syntaxTree = codeDocument.GetSyntaxTree();
ThrowForMissingDocumentDependency(syntaxTree);
var descriptors = codeDocument.GetTagHelpers();
if (descriptors == null)
{
var feature = Engine.Features.OfType <ITagHelperFeature>().FirstOrDefault();
if (feature == null)
{
// No feature, nothing to do.
return;
}
descriptors = feature.GetDescriptors();
}
// 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 = null;
var parserOptions = codeDocument.GetParserOptions();
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);
}