public static List<BindingMap> GetMaps(string paths)
{
var scan = new StringScan(paths);
var ex = new ArgumentException("Invalid path");
var maps = new List<BindingMap>();
var state = ParseState.Begin;
var current = StringScan.EOF;
//Parsing State Machine
switch (state)
{
case ParseState.Begin:
case ParseState.BeginMap:
var map = ParseMap(scan);
if (!maps.Contains(map))
maps.Add(map);
goto case ParseState.EndMap;
case ParseState.EndMap:
current = scan.Current();
if (current == ',')
{
scan.MoveNext();
goto case ParseState.BeginMap;
}
if (current == StringScan.EOF)
goto case ParseState.End;
throw scan.CreateException();
case ParseState.End:
break;
}
return maps;
}
private static BindingMap ParseMap(StringScan scan)
{
var state = MapState.Begin;
var map = new BindingMap();
var current = StringScan.EOF;
//Parsing State Machine
switch (state)
{
case MapState.Begin:
current = scan.SkipWhitespace();
if (current == '*')
goto case MapState.WildCardMatch;
if (char.IsLetter(current) || current == '_')
goto case MapState.AmbiguousNamespace;
if (current == '~')
{
map.MatchPath.IsWildcard = true;
goto case MapState.RelativeBinding;
}
if (current == '-')
{
map.MatchPath.IsWildcard = true;
goto case MapState.RelativeRootBinding;
}
throw scan.CreateException();
case MapState.WildCardMatch:
map.MatchPath.IsWildcard = true;
current = scan.MoveNext();
if (current == '.')
{
scan.MoveNext();
goto case MapState.MatchNamespace;
}
if (char.IsWhiteSpace(current))
{
current = scan.SkipWhitespace();
if (current == '=')
goto case MapState.MapOp;
throw scan.CreateException();
}
if (current == '=')
goto case MapState.MapOp;
throw scan.CreateException();
case MapState.AmbiguousNamespace:
string nsp = ScanNamespace(scan);
current = scan.Current();
if (char.IsWhiteSpace(current))
{
current = scan.SkipWhitespace();
if (current == '=')
{
map.MatchPath.Namespace = nsp;
goto case MapState.MapOp;
}
map.MatchPath.IsWildcard = true;
map.BindingPath.Namespace = nsp;
goto case MapState.End;
}
if (current == '=')
{
map.MatchPath.Namespace = nsp;
goto case MapState.MapOp;
}
map.MatchPath.IsWildcard = true;
map.BindingPath.Namespace = nsp;
goto case MapState.End;
case MapState.MatchNamespace:
map.MatchPath.Namespace = ScanNamespace(scan);
current = scan.Current();
if (char.IsWhiteSpace(current))
{
current = scan.SkipWhitespace();
if (current == '=')
goto case MapState.MapOp;
throw scan.CreateException();
}
if (current == '=')
goto case MapState.MapOp;
throw scan.CreateException();
case MapState.MapOp:
current = scan.MoveNext();
if (current == '>')
goto case MapState.Binding;
throw scan.CreateException();
case MapState.Binding:
scan.MoveNext();
current = scan.SkipWhitespace();
if (char.IsLetter(current) || current == '_')
goto case MapState.BindingNamespace;
if (current == '~')
goto case MapState.RelativeBinding;
if (current == '-')
goto case MapState.RelativeRootBinding;
throw scan.CreateException();
case MapState.BindingNamespace:
map.BindingPath.Namespace = ScanNamespace(scan);
goto case MapState.End;
case MapState.RelativeBinding:
map.BindingPath.IsRelative = true;
current = scan.MoveNext();
if (current == '.')
{
scan.MoveNext();
goto case MapState.BindingNamespace;
}
goto case MapState.End;
case MapState.RelativeRootBinding:
map.BindingPath.IsRelative = true;
while (true)
{
map.BindingPath.RootDepth++;
current = scan.MoveNext();
if (current == '.')
{
current = scan.MoveNext();
if (current == '-')
continue;
if (char.IsLetter(current) || current == '_')
goto case MapState.BindingNamespace;
throw scan.CreateException();
}
goto case MapState.End;
}
case MapState.End:
scan.SkipWhitespace();
break;
}
return map;
}
private static string ScanNamespace(StringScan scan)
{
scan.StartBuffer();
char current = scan.Current();
while (true)
{
if (current != '_' && !char.IsLetter(current))
throw scan.CreateException();
while (true)
{
current = scan.MoveNext();
if (current == '_' || char.IsLetter(current) || char.IsDigit(current))
continue;
if (current == '.')
{
current = scan.MoveNext();
break;
}
var result = scan.DumpBuffer();
return result;
}
}
}