public void CreateCodeMapping(string padding, string code, Chunk chunk)
{
using (CSharpLineMappingWriter mappingWriter = Writer.BuildLineMapping(chunk.Start, code.Length, Context.SourceFile))
{
Writer.Write(padding);
mappingWriter.MarkLineMappingStart();
Writer.Write(code);
mappingWriter.MarkLineMappingEnd();
}
}
protected override void Visit(SetBaseTypeChunk chunk)
{
if (Context.Host.DesignTimeMode)
{
using (CSharpLineMappingWriter lineMappingWriter = Writer.BuildLineMapping(chunk.Start, chunk.TypeName.Length, Context.SourceFile))
{
Writer.Indent(chunk.Start.CharacterIndex);
lineMappingWriter.MarkLineMappingStart();
Writer.Write(chunk.TypeName);
lineMappingWriter.MarkLineMappingEnd();
Writer.Write(" ").Write(InheritsHelper).Write(" = null;");
}
}
}
private void RenderBoundHTMLAttributes(IDictionary <string, Chunk> chunkAttributes,
string tagHelperVariableName,
IEnumerable <TagHelperAttributeDescriptor> attributeDescriptors,
Dictionary <string, string> htmlAttributeValues)
{
foreach (var attributeDescriptor in attributeDescriptors)
{
Chunk attributeValueChunk;
var providedAttribute = chunkAttributes.TryGetValue(attributeDescriptor.Name,
out attributeValueChunk);
if (providedAttribute)
{
var attributeValueRecorded = htmlAttributeValues.ContainsKey(attributeDescriptor.Name);
// Bufferable attributes are attributes that can have Razor code inside of them.
var bufferableAttribute = IsStringAttribute(attributeDescriptor);
// Plain text values are non Razor code (@DateTime.Now) values. If an attribute is bufferable it
// may be more than just a plain text value, it may also contain Razor code which is why we attempt
// to retrieve a plain text value here.
string textValue;
var isPlainTextValue = TryGetPlainTextValue(attributeValueChunk, out textValue);
// If we haven't recorded a value and we need to buffer an attribute value and the value is not
// plain text then we need to prepare the value prior to setting it below.
if (!attributeValueRecorded && bufferableAttribute && !isPlainTextValue)
{
BuildBufferedWritingScope(attributeValueChunk);
}
// We capture the tag helpers property value accessor so we can retrieve it later (if we need to).
var valueAccessor = string.Format(CultureInfo.InvariantCulture,
"{0}.{1}",
tagHelperVariableName,
attributeDescriptor.PropertyName);
// If we haven't recorded this attribute value before then we need to record its value.
if (!attributeValueRecorded)
{
// We only need to create attribute values once per HTML element (not once per tag helper).
// We're saving the value accessor so we can retrieve it later if there are more tag
// helpers that need the value.
htmlAttributeValues.Add(attributeDescriptor.Name, valueAccessor);
if (bufferableAttribute)
{
_writer.WriteStartAssignment(valueAccessor);
if (isPlainTextValue)
{
// If the attribute is bufferable but has a plain text value that means the value
// is a string which needs to be surrounded in quotes.
RenderQuotedAttributeValue(textValue, attributeDescriptor);
}
else
{
// The value contains more than plain text e.g.
// stringAttribute ="Time: @DateTime.Now"
RenderBufferedAttributeValue(attributeDescriptor);
}
_writer.WriteLine(";");
}
else
{
// Write out simple assignment for non-string property value. Try to keep the whole
// statement together and the #line pragma correct to make debugging possible.
using (var lineMapper = new CSharpLineMappingWriter(
_writer,
attributeValueChunk.Association.Start,
_context.SourceFile))
{
// Place the assignment LHS to align RHS with original attribute value's indentation.
// Unfortunately originalIndent is incorrect if original line contains tabs. Unable to
// use a CSharpPaddingBuilder because the Association has no Previous node; lost the
// original Span sequence when the parse tree was rewritten.
var originalIndent = attributeValueChunk.Start.CharacterIndex;
var generatedLength = valueAccessor.Length + " = ".Length;
var newIndent = originalIndent - generatedLength;
if (newIndent > 0)
{
_writer.Indent(newIndent);
}
_writer.WriteStartAssignment(valueAccessor);
lineMapper.MarkLineMappingStart();
// Write out bare expression for this attribute value. Property is not a string.
// So quoting or buffering are not helpful.
RenderRawAttributeValue(attributeValueChunk, attributeDescriptor, isPlainTextValue);
// End the assignment to the attribute.
lineMapper.MarkLineMappingEnd();
_writer.WriteLine(";");
}
}
// Execution contexts are a runtime feature.
if (_designTimeMode)
{
continue;
}
// We need to inform the context of the attribute value.
_writer
.WriteStartInstanceMethodInvocation(
ExecutionContextVariableName,
_tagHelperContext.ExecutionContextAddTagHelperAttributeMethodName)
.WriteStringLiteral(attributeDescriptor.Name)
.WriteParameterSeparator()
.Write(valueAccessor)
.WriteEndMethodInvocation();
}
else
{
// The attribute value has already been recorded, lets retrieve it from the stored value
// accessors.
_writer
.WriteStartAssignment(valueAccessor)
.Write(htmlAttributeValues[attributeDescriptor.Name])
.WriteLine(";");
}
}
}
}
