public void WriteTagHelperBody_Runtime_RendersCorrectly_UsesTagNameAndModeFromContext()
{
// Arrange
var extension = new DefaultTagHelperTargetExtension();
var context = TestCodeRenderingContext.CreateRuntime();
var tagHelperNode = new TagHelperIntermediateNode();
var node = new DefaultTagHelperBodyIntermediateNode()
{
Children =
{
new CSharpExpressionIntermediateNode(),
},
TagMode = TagMode.SelfClosing,
TagName = "p",
};
tagHelperNode.Children.Add(node);
Push(context, tagHelperNode);
// Act
extension.WriteTagHelperBody(context, node);
// Assert
var csharp = context.CodeWriter.GenerateCode();
Assert.Equal(
@"__tagHelperExecutionContext = __tagHelperScopeManager.Begin(""p"", global::Microsoft.AspNetCore.Razor.TagHelpers.TagMode.SelfClosing, ""test"", async() => {
Render Children
}
);
",
csharp,
ignoreLineEndingDifferences: true);
}
public void WriteTagHelperBody_DesignTime_WritesChildren()
{
// Arrange
var extension = new DefaultTagHelperTargetExtension();
var context = TestCodeRenderingContext.CreateDesignTime();
var tagHelperNode = new TagHelperIntermediateNode();
var node = new DefaultTagHelperBodyIntermediateNode()
{
Children =
{
new CSharpExpressionIntermediateNode(),
}
};
tagHelperNode.Children.Add(node);
Push(context, tagHelperNode);
// Act
extension.WriteTagHelperBody(context, node);
// Assert
var csharp = context.CodeWriter.GenerateCode();
Assert.Equal(
@"Render Children
",
csharp,
ignoreLineEndingDifferences: true);
}
public void WriteTagHelperBody(CodeRenderingContext context, DefaultTagHelperBodyIntermediateNode node)
{
if (context.Parent as TagHelperIntermediateNode == null)
{
var message = Resources.FormatIntermediateNodes_InvalidParentNode(node.GetType(), typeof(TagHelperIntermediateNode));
throw new InvalidOperationException(message);
}
if (context.Options.DesignTime)
{
context.RenderChildren(node);
}
else
{
// Call into the tag helper scope manager to start a new tag helper scope.
// Also capture the value as the current execution context.
context.CodeWriter
.WriteStartAssignment(ExecutionContextVariableName)
.WriteStartInstanceMethodInvocation(
ScopeManagerVariableName,
ScopeManagerBeginMethodName);
// Assign a unique ID for this instance of the source HTML tag. This must be unique
// per call site, e.g. if the tag is on the view twice, there should be two IDs.
var uniqueId = (string)context.Items[CodeRenderingContext.SuppressUniqueIds];
if (uniqueId == null)
{
uniqueId = GetDeterministicId(context);
}
context.CodeWriter.WriteStringLiteral(node.TagName)
.WriteParameterSeparator()
.Write(TagModeTypeName)
.Write(".")
.Write(node.TagMode.ToString())
.WriteParameterSeparator()
.WriteStringLiteral(uniqueId)
.WriteParameterSeparator();
using (context.CodeWriter.BuildAsyncLambda())
{
// We remove and redirect writers so TagHelper authors can retrieve content.
context.RenderChildren(node, new RuntimeNodeWriter());
}
context.CodeWriter.WriteEndMethodInvocation();
}
}
