private static void DeleteNoInits(JsVar node, int min, string name)
{
// walk backwards from the end of the list down to (and including) the minimum index
for (int ndx = node.Count - 1; ndx >= min; --ndx)
{
var varDecl = node[ndx];
// if the name matches and there is no initializer...
if (string.CompareOrdinal(varDecl.Identifier, name) == 0
&& varDecl.Initializer == null)
{
// ...remove it from the list and from the field's declarations
node.RemoveAt(ndx);
varDecl.VariableField.Declarations.Remove(varDecl);
}
}
}
public override void Visit(JsVar node)
{
if (node != null)
{
// first we want to weed out duplicates that don't have initializers
// var a=1, a=2 is okay, but var a, a=2 and var a=2, a should both be just var a=2,
// and var a, a should just be var a
if (m_parser.Settings.IsModificationAllowed(JsTreeModifications.RemoveDuplicateVar))
{
// first we want to weed out duplicates that don't have initializers
// var a=1, a=2 is okay, but var a, a=2 and var a=2, a should both be just var a=2,
// and var a, a should just be var a
int ndx = 0;
while (ndx < node.Count)
{
string thisName = node[ndx].Identifier;
// handle differently if we have an initializer or not
if (node[ndx].Initializer != null)
{
// the current vardecl has an initializer, so we want to delete any other
// vardecls of the same name in the rest of the list with no initializer
// and move on to the next item afterwards
DeleteNoInits(node, ++ndx, thisName);
}
else
{
// this vardecl has no initializer, so we can delete it if there is ANY
// other vardecl with the same name (whether or not it has an initializer)
if (VarDeclExists(node, ndx + 1, thisName))
{
// don't increment the index; we just deleted the current item,
// so the next item just slid into this position
node[ndx].VariableField.Declarations.Remove(node[ndx]);
node.RemoveAt(ndx);
}
else
{
// nope -- it's the only one. Move on to the next
++ndx;
}
}
}
}
// recurse the analyze
base.Visit(node);
}
}