// Currently the same for design time and runtime
public void WriteComponentTypeInferenceMethod(CodeRenderingContext context, ComponentTypeInferenceMethodIntermediateNode node)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (node == null)
{
throw new ArgumentNullException(nameof(node));
}
// This is ugly because CodeWriter doesn't allow us to erase, but we need to comma-delimit. So we have to
// materizalize something can iterate, or use string.Join. We'll need this multiple times, so materializing
// it.
var parameters = GetParameterDeclarations();
// This is really similar to the code in WriteComponentAttribute and WriteComponentChildContent - except simpler because
// attributes and child contents look like variables.
//
// Looks like:
//
// public static void CreateFoo_0<T1, T2>(RenderTreeBuilder builder, int seq, int __seq0, T1 __arg0, int __seq1, global::System.Collections.Generic.List<T2> __arg1, int __seq2, string __arg2)
// {
// builder.OpenComponent<Foo<T1, T2>>();
// builder.AddAttribute(__seq0, "Attr0", __arg0);
// builder.AddAttribute(__seq1, "Attr1", __arg1);
// builder.AddAttribute(__seq2, "Attr2", __arg2);
// builder.CloseComponent();
// }
//
// As a special case, we need to generate a thunk for captures in this block instead of using
// them verbatim.
//
// The problem is that RenderTreeBuilder wants an Action<object>. The caller can't write the type
// name if it contains generics, and we can't write the variable they want to assign to.
var writer = context.CodeWriter;
writer.Write("public static void ");
writer.Write(node.MethodName);
writer.Write("<");
writer.Write(string.Join(", ", node.Component.Component.GetTypeParameters().Select(a => a.Name)));
writer.Write(">");
writer.Write("(");
writer.Write("global::");
writer.Write(ComponentsApi.RenderTreeBuilder.FullTypeName);
writer.Write(" builder");
writer.Write(", ");
writer.Write("int seq");
if (parameters.Count > 0)
{
writer.Write(", ");
}
for (var i = 0; i < parameters.Count; i++)
{
writer.Write("int ");
writer.Write(parameters[i].seqName);
writer.Write(", ");
writer.Write(parameters[i].typeName);
writer.Write(" ");
writer.Write(parameters[i].parameterName);
if (i < parameters.Count - 1)
{
writer.Write(", ");
}
}
writer.Write(")");
writer.WriteLine();
writer.WriteLine("{");
// builder.OpenComponent<TComponent>(42);
context.CodeWriter.Write("builder");
context.CodeWriter.Write(".");
context.CodeWriter.Write(ComponentsApi.RenderTreeBuilder.OpenComponent);
context.CodeWriter.Write("<");
context.CodeWriter.Write(node.Component.TypeName);
context.CodeWriter.Write(">(");
context.CodeWriter.Write("seq");
context.CodeWriter.Write(");");
context.CodeWriter.WriteLine();
var index = 0;
foreach (var attribute in node.Component.Attributes)
{
context.CodeWriter.WriteStartInstanceMethodInvocation("builder", ComponentsApi.RenderTreeBuilder.AddAttribute);
context.CodeWriter.Write(parameters[index].seqName);
context.CodeWriter.Write(", ");
context.CodeWriter.Write($"\"{attribute.AttributeName}\"");
context.CodeWriter.Write(", ");
context.CodeWriter.Write(parameters[index].parameterName);
context.CodeWriter.WriteEndMethodInvocation();
index++;
}
foreach (var childContent in node.Component.ChildContents)
{
context.CodeWriter.WriteStartInstanceMethodInvocation("builder", ComponentsApi.RenderTreeBuilder.AddAttribute);
context.CodeWriter.Write(parameters[index].seqName);
context.CodeWriter.Write(", ");
context.CodeWriter.Write($"\"{childContent.AttributeName}\"");
context.CodeWriter.Write(", ");
context.CodeWriter.Write(parameters[index].parameterName);
context.CodeWriter.WriteEndMethodInvocation();
index++;
}
foreach (var capture in node.Component.Captures)
{
context.CodeWriter.WriteStartInstanceMethodInvocation("builder", capture.IsComponentCapture ? ComponentsApi.RenderTreeBuilder.AddComponentReferenceCapture : ComponentsApi.RenderTreeBuilder.AddElementReferenceCapture);
context.CodeWriter.Write(parameters[index].seqName);
context.CodeWriter.Write(", ");
var cast = capture.IsComponentCapture ? $"({capture.ComponentCaptureTypeName})" : string.Empty;
context.CodeWriter.Write($"(__value) => {{ {parameters[index].parameterName}({cast}__value); }}");
context.CodeWriter.WriteEndMethodInvocation();
index++;
}
context.CodeWriter.WriteInstanceMethodInvocation("builder", ComponentsApi.RenderTreeBuilder.CloseComponent);
writer.WriteLine("}");
List <(string seqName, string typeName, string parameterName)> GetParameterDeclarations()
{
var p = new List <(string seqName, string typeName, string parameterName)>();
foreach (var attribute in node.Component.Attributes)
{
p.Add(($"__seq{p.Count}", attribute.TypeName, $"__arg{p.Count}"));
}
foreach (var childContent in node.Component.ChildContents)
{
p.Add(($"__seq{p.Count}", childContent.TypeName, $"__arg{p.Count}"));
}
foreach (var capture in node.Component.Captures)
{
p.Add(($"__seq{p.Count}", capture.TypeName, $"__arg{p.Count}"));
}
return(p);
}
}
private void CreateTypeInferenceMethod(
DocumentIntermediateNode documentNode,
ComponentExtensionNode node,
Dictionary <string, GenericTypeNameRewriter.Binding> bindings)
{
var @namespace = documentNode.FindPrimaryNamespace().Content;
@namespace = string.IsNullOrEmpty(@namespace) ? "__Blazor" : "__Blazor." + @namespace;
@namespace += "." + documentNode.FindPrimaryClass().ClassName;
var typeInferenceNode = new ComponentTypeInferenceMethodIntermediateNode()
{
Bindings = bindings,
Component = node,
// Method name is generated and guaranteed not to collide, since it's unique for each
// component call site.
MethodName = $"Create{node.TagName}_{_id++}",
FullTypeName = @namespace + ".TypeInference",
};
node.TypeInferenceNode = typeInferenceNode;
// Now we need to insert the type inference node into the tree.
var namespaceNode = documentNode.Children
.OfType <NamespaceDeclarationIntermediateNode>()
.Where(n => n.Annotations.Contains(new KeyValuePair <object, object>(BlazorMetadata.Component.GenericTypedKey, bool.TrueString)))
.FirstOrDefault();
if (namespaceNode == null)
{
namespaceNode = new NamespaceDeclarationIntermediateNode()
{
Annotations =
{
{ BlazorMetadata.Component.GenericTypedKey, bool.TrueString },
},
Content = @namespace,
};
documentNode.Children.Add(namespaceNode);
}
var classNode = namespaceNode.Children
.OfType <ClassDeclarationIntermediateNode>()
.Where(n => n.ClassName == "TypeInference")
.FirstOrDefault();
if (classNode == null)
{
classNode = new ClassDeclarationIntermediateNode()
{
ClassName = "TypeInference",
Modifiers =
{
"internal",
"static",
},
};
namespaceNode.Children.Add(classNode);
}
classNode.Children.Add(typeInferenceNode);
}
