private LibraryFilter(LibraryFilter parent, String searchString)
{
_parent = parent;
_searchString = searchString;
Initialize();
}
private void Initialize()
{
String s = _searchString;
s = s.ToLowerInvariant();
s = s.Replace(" and ", "&");
s = s.Replace(" or ", "|");
s = s.Replace(" like ", "~");
s = s.Replace(" equals ", "=");
s = s.Replace(" not ", "-");
var substrings = RemoveParentheses(ref s);
// AND operation
var array = s.Split('&');
int i;
for (i = 0; i < array.Length; i++)
{
array[i] = array[i].Trim();
}
if (array.Length > 1)
{
_operation = Operation.And;
RestoreParentheses(ref array, substrings);
foreach (var ss in array)
{
var child = new LibraryFilter(this, ss);
_children.Add(child);
}
return;
}
// OR operation
array = s.Split('|');
for (i = 0; i < array.Length; i++)
{
array[i] = array[i].Trim();
}
if (array.Length > 1)
{
_operation = Operation.Or;
RestoreParentheses(ref array, substrings);
foreach (var ss in array)
{
var child = new LibraryFilter(this, ss);
_children.Add(child);
}
return;
}
RestoreParentheses(ref array, substrings);
s = array[0];
//eliminate outward parentheses if any
int par = s.IndexOf('(');
if (par >= 0)
{
_sign = GetSign(ref s);
if (!_sign)
{
par = s.IndexOf('(');
}
s = s.Remove(par, 1);
int lpar = s.LastIndexOf(')');
if (lpar < 0)
{
return; //mismatched parentheses
}
s = s.Remove(lpar, 1);
s = s.Trim();
_operation = Operation.Sign;
var child = new LibraryFilter(this, s);
_children.Add(child);
return;
}
_sign = GetSign(ref s);
// Equals Evaluation
array = s.Split('=');
if (array.Length > 2)
{
return; // bad request
}
if (array.Length == 2)
{
_operation = Operation.TestEquals;
_field = array[0].Trim();
_value = array[1].Trim();
return;
}
// Contains Evaluation
_operation = Operation.TestContains;
array = s.Split('~');
if (array.Length > 2)
{
return; // bad request
}
if (array.Length == 2)
{
_field = array[0].Trim();
_value = array[1].Trim();
return;
}
_field = "path";
_value = s.Trim();
}
public LibraryFilter(String searchString)
{
_parent = null;
_searchString = searchString;
Initialize();
}