public static List<FieldSelectorTreeNode> Expand(string partialResponseFields)
{
if (string.IsNullOrWhiteSpace(partialResponseFields))
{
return new List<FieldSelectorTreeNode>();
}
if (FieldSelectorConstants.StartsWithReservedToken(partialResponseFields))
{
throw new ArgumentException(
"A reserved token can not be the first character of the fields selector.", "partialResponseFields");
}
var subSelectStack = new Stack<FieldSelectorTreeNode>();
var nestedStack = new Stack<FieldSelectorTreeNode>();
var currentMemberName = new StringBuilder();
var parent = new FieldSelectorTreeNode(string.Empty);
foreach (char c in partialResponseFields)
{
FieldSelectorTreeNode childNode;
switch (c)
{
case FieldSelectorConstants.NestedFieldSelector:
if (currentMemberName.Length == 0)
{
throw new ArgumentException(
string.Format(
"Nested Field token '{0}' can not be preceeded by another reserved token.",
FieldSelectorConstants.NestedFieldSelector),
"partialResponseFields");
}
childNode = parent.GetOrAddChildNode(currentMemberName.ToString());
currentMemberName = new StringBuilder();
nestedStack.Push(parent);
parent = childNode;
break;
case FieldSelectorConstants.MultipleFieldSeparator:
if (currentMemberName.Length != 0)
{
parent.GetOrAddChildNode(currentMemberName.ToString());
currentMemberName = new StringBuilder();
}
while (nestedStack.Count > 0)
{
parent = nestedStack.Pop();
}
break;
case FieldSelectorConstants.BeginSubSelectExpression:
if (currentMemberName.Length == 0)
{
throw new ArgumentException(
string.Format(
"Begin Subselection token '{0}' can not be preceeded by another reserved token.",
FieldSelectorConstants.BeginSubSelectExpression),
"partialResponseFields");
}
childNode = parent.GetOrAddChildNode(currentMemberName.ToString());
currentMemberName = new StringBuilder();
subSelectStack.Push(parent);
parent = childNode;
nestedStack = new Stack<FieldSelectorTreeNode>();
break;
case FieldSelectorConstants.EndSubSelectExpression:
if (currentMemberName.Length != 0)
{
parent.GetOrAddChildNode(currentMemberName.ToString());
currentMemberName = new StringBuilder();
}
parent = subSelectStack.Pop();
nestedStack = new Stack<FieldSelectorTreeNode>();
break;
default:
currentMemberName.Append(c);
break;
}
}
if (currentMemberName.Length > 0)
{
parent.GetOrAddChildNode(currentMemberName.ToString());
while (nestedStack.Count > 0)
{
parent = nestedStack.Pop();
}
}
return parent.Children;
}
public static List <FieldSelectorTreeNode> Expand(string partialResponseFields)
{
if (string.IsNullOrWhiteSpace(partialResponseFields))
{
return(new List <FieldSelectorTreeNode>());
}
if (FieldSelectorConstants.StartsWithReservedToken(partialResponseFields))
{
throw new ArgumentException(
"A reserved token can not be the first character of the fields selector.", "partialResponseFields");
}
var subSelectStack = new Stack <FieldSelectorTreeNode>();
var nestedStack = new Stack <FieldSelectorTreeNode>();
var currentMemberName = new StringBuilder();
var parent = new FieldSelectorTreeNode(string.Empty);
foreach (char c in partialResponseFields)
{
FieldSelectorTreeNode childNode;
switch (c)
{
case FieldSelectorConstants.NestedFieldSelector:
if (currentMemberName.Length == 0)
{
throw new ArgumentException(
string.Format(
"Nested Field token '{0}' can not be preceeded by another reserved token.",
FieldSelectorConstants.NestedFieldSelector),
"partialResponseFields");
}
childNode = parent.GetOrAddChildNode(currentMemberName.ToString());
currentMemberName = new StringBuilder();
nestedStack.Push(parent);
parent = childNode;
break;
case FieldSelectorConstants.MultipleFieldSeparator:
if (currentMemberName.Length != 0)
{
parent.GetOrAddChildNode(currentMemberName.ToString());
currentMemberName = new StringBuilder();
}
while (nestedStack.Count > 0)
{
parent = nestedStack.Pop();
}
break;
case FieldSelectorConstants.BeginSubSelectExpression:
if (currentMemberName.Length == 0)
{
throw new ArgumentException(
string.Format(
"Begin Subselection token '{0}' can not be preceeded by another reserved token.",
FieldSelectorConstants.BeginSubSelectExpression),
"partialResponseFields");
}
childNode = parent.GetOrAddChildNode(currentMemberName.ToString());
currentMemberName = new StringBuilder();
subSelectStack.Push(parent);
parent = childNode;
nestedStack = new Stack <FieldSelectorTreeNode>();
break;
case FieldSelectorConstants.EndSubSelectExpression:
if (currentMemberName.Length != 0)
{
parent.GetOrAddChildNode(currentMemberName.ToString());
currentMemberName = new StringBuilder();
}
parent = subSelectStack.Pop();
nestedStack = new Stack <FieldSelectorTreeNode>();
break;
default:
currentMemberName.Append(c);
break;
}
}
if (currentMemberName.Length > 0)
{
parent.GetOrAddChildNode(currentMemberName.ToString());
while (nestedStack.Count > 0)
{
parent = nestedStack.Pop();
}
}
return(parent.Children);
}
