static void RecurseParameters(AstNodeList parameterList, AstNode node)
{
if (node != null)
{
// if this is a comma operator, then we need to
var binOp = node as BinaryExpression;
if (binOp != null && binOp.OperatorToken == JSToken.Comma)
{
// there are two or more parameters - recurse the list so we get them added left to right,
// converting each one to a binding object
RecurseParameters(parameterList, binOp.Operand1);
// comma operators can flatten lots of commas to an element on the left, and subsequent
// elements in a list on the right.
var rightList = binOp.Operand2 as AstNodeList;
if (rightList != null)
{
foreach (var listItem in rightList.Children)
{
parameterList.Append(ConvertToParameter(listItem, parameterList.Count));
}
}
else
{
// nope, just a single item
parameterList.Append(ConvertToParameter(binOp.Operand2, parameterList.Count));
}
}
else
{
// nope; single operand to convert to a parameter
parameterList.Append(ConvertToParameter(node, 0));
}
}
}
public override bool ReplaceChild(AstNode oldNode, AstNode newNode)
{
// if the old node isn't our element list, ignore the cal
if (oldNode == Elements)
{
if (newNode == null)
{
// we want to remove the list altogether
Elements = null;
return(true);
}
else
{
// if the new node isn't an AstNodeList, then ignore the call
AstNodeList newList = newNode as AstNodeList;
if (newList != null)
{
// replace it
Elements = newList;
return(true);
}
}
}
return(false);
}
public static AstNodeList ToParameters(AstNode node)
{
AstNodeList parameterList = null;
if (node != null)
{
parameterList = new AstNodeList(node.Context);
// ignore any parentheses around the parameter(s)
var groupingOperator = node as GroupingOperator;
RecurseParameters(
parameterList,
groupingOperator != null ? groupingOperator.Operand : node);
}
return(parameterList);
}
public override bool ReplaceChild(AstNode oldNode, AstNode newNode)
{
if (Expression == oldNode)
{
Expression = newNode;
return(true);
}
if (Cases == oldNode)
{
AstNodeList newList = newNode as AstNodeList;
if (newNode == null || newList != null)
{
// remove it
Cases = newList;
return(true);
}
}
return(false);
}
/// <summary>
/// an astlist is equivalent to another astlist if they both have the same number of
/// items, and each item is equivalent to the corresponding item in the other
/// </summary>
/// <param name="otherNode"></param>
/// <returns></returns>
public override bool IsEquivalentTo(AstNode otherNode)
{
bool isEquivalent = false;
AstNodeList otherList = otherNode as AstNodeList;
if (otherList != null && m_list.Count == otherList.Count)
{
// now assume it's true unless we come across an item that ISN'T
// equivalent, at which case we'll bail the test.
isEquivalent = true;
for (var ndx = 0; ndx < m_list.Count; ++ndx)
{
if (!m_list[ndx].IsEquivalentTo(otherList[ndx]))
{
isEquivalent = false;
break;
}
}
}
return(isEquivalent);
}
