protected override void Visit(ExpressionChunk chunk)
{
var expressionPiece = new CSharpSource
{
Code = chunk.Code,
};
_context.Builder.Add(expressionPiece);
}
private void Walk(ICSharpSource source)
{
var csharpBlock = source as CSharpBlock;
if (csharpBlock != null)
{
for (var i = 0; i < csharpBlock.Children.Count; i++)
{
Walk(csharpBlock.Children[i]);
}
}
else if (source is SetTagHelperProperty)
{
var setProperty = (SetTagHelperProperty)source;
if (!string.Equals(setProperty.AssociatedDescriptor.TypeName, _attributeLiterals.ModelExpressionTypeName, StringComparison.Ordinal))
{
return;
}
var csharpPrefix = new StringBuilder();
csharpPrefix
.Append(_attributeLiterals.ModelExpressionProviderPropertyName)
.Append(".")
.Append(_attributeLiterals.CreateModelExpressionMethodName)
.Append("(")
.Append(_attributeLiterals.ViewDataPropertyName)
.Append(", __model => ");
if (setProperty.Value.Children.Count == 1 && setProperty.Value.Children.First() is RenderHtml)
{
// Simple attribute value
csharpPrefix.Append("__model.");
}
// TODO: Code smell, this is mutating the tree. Should we be replacing entirely?
var csharpPrefixElement = new CSharpSource {
Code = csharpPrefix.ToString()
};
setProperty.Value.Children.Insert(0, csharpPrefixElement);
var csharpSuffixElement = new CSharpSource {
Code = ")"
};
setProperty.Value.Children.Add(csharpSuffixElement);
}
}