/*--------------------------------------------------------------------------------------------*/
public static TBack Back <T, TBack>(this T pElem, IWeaverStepAs <TBack> pAlias)
where T : IWeaverElement where TBack : IWeaverElement
{
var f = new WeaverStepBack <TBack>(pAlias);
pElem.Path.AddItem(f);
return(pAlias.Item);
}
////////////////////////////////////////////////////////////////////////////////////////////////
/*--------------------------------------------------------------------------------------------*/
public WeaverStepBack(IWeaverStepAs <T> pBackToItem)
{
int i = pBackToItem.PathIndex;
if (i < 0)
{
throw new WeaverStepException(this,
"The specified return item is not present in the current path.");
}
BackToItem = pBackToItem;
vLabel = pBackToItem.Label;
}
////////////////////////////////////////////////////////////////////////////////////////////////
/*--------------------------------------------------------------------------------------------*/
public static T As <T>(this T pElem, out IWeaverStepAs <T> pAlias) where T : IWeaverElement
{
pAlias = new WeaverStepAs <T>(pElem);
pElem.Path.AddItem(pAlias);
return(pElem);
}
/*--------------------------------------------------------------------------------------------*/
public override string BuildParameterizedString()
{
int thisI = Path.IndexOfItem(this);
var sb = new StringBuilder("table(" + Alias.Name + "=new Table())");
var asSteps = new List <IWeaverStepAs>();
int prevI = -1;
int prevLevel = -1;
// Collect all the "as" aliases. Reverse the order of any contiguous aliases. This matches
// the odd Gremlin functionality (possibly a bug). This results in (pseudocode):
// g.v(1).as('id').as('name').table(t){it.name}{it.id}; //note the id/name order swap
for (int i = 0; i < thisI; ++i)
{
IWeaverPathItem item = Path.ItemAtIndex(i);
IWeaverStepAs a = (item as IWeaverStepAs);
if (a == null)
{
continue;
}
if (i - 1 == prevI)
{
asSteps.Insert(prevLevel, a);
}
else
{
asSteps.Add(a);
prevLevel = asSteps.Count - 1;
}
prevI = i;
}
// Append column closures for each "as" alias. Non-column aliases are given the empty "{}"
// closure. The column can be property or object based, and the closure script can
// (optionally) can be appended or replaced.
foreach (IWeaverStepAs a in asSteps)
{
IWeaverStepAsColumn col = (a as IWeaverStepAsColumn);
if (col == null)
{
sb.Append("{}");
continue;
}
if (col.ReplaceScript != null)
{
sb.Append("{" + col.ReplaceScript + "}");
continue;
}
if (col.PropName != null)
{
string p = Path.Query.AddStringParam(col.PropName);
sb.Append("{it.getProperty(" + p + ")" + col.AppendScript + "}");
continue;
}
sb.Append("{it" + col.AppendScript + "}");
}
return(sb.ToString());
}
