public override Expression GetAccumulatedBlock()
{
return(HandlebarsExpression.PartialExpression(
_startingNode.PartialName,
_startingNode.Argument,
_body.Count > 1 ? Expression.Block(_body) : _body.First()));
}
public IEnumerable <object> ConvertTokens(IEnumerable <object> sequence)
{
var enumerator = sequence.GetEnumerator();
while (enumerator.MoveNext())
{
var item = enumerator.Current;
if (item is PartialToken)
{
var arguments = AccumulateArguments(enumerator);
if (arguments.Count == 0)
{
throw new HandlebarsCompilerException("A partial must have a name");
}
var partialName = arguments[0];
if (partialName is PathExpression pathExpression)
{
partialName = Expression.Constant(pathExpression.Path);
}
switch (arguments.Count)
{
case 1:
yield return(HandlebarsExpression.PartialExpression(partialName));
break;
case 2:
yield return(HandlebarsExpression.PartialExpression(partialName, arguments [1]));
break;
default:
throw new HandlebarsCompilerException("A partial can only accept 0 or 1 arguments");
}
yield return(enumerator.Current);
}
else
{
yield return(item);
}
}
}
private PartialExpression ConvertToPartialExpression(Expression expression)
{
if (expression is PathExpression pathExpression)
{
_blockName = pathExpression.Path.Replace("#>", "");
return(HandlebarsExpression.PartialExpression(Expression.Constant(_blockName)));
}
if (expression is HelperExpression helperExpression)
{
_blockName = helperExpression.HelperName.Replace("#>", "");
if (!helperExpression.Arguments.Any())
{
return(HandlebarsExpression.PartialExpression(Expression.Constant(_blockName)));
}
if (helperExpression.Arguments.Count() == 1)
{
return(HandlebarsExpression.PartialExpression(
Expression.Constant(_blockName),
helperExpression.Arguments.First()));
}
throw new InvalidOperationException("Cannot convert a multi-argument helper expression to a partial expression");
}
throw new InvalidOperationException(string.Format("Cannot convert '{0}' to a partial expression", expression));
}
