private static UriTemplatePart[] ParseTemplate(string template)
{
List <UriTemplatePart> parts = new List <UriTemplatePart>();
int previousEnd = 0;
foreach (Match match in ExpressionExpression.Matches(template))
{
if (match.Index > previousEnd)
{
parts.Add(new UriTemplatePartLiteral(template.Substring(previousEnd, match.Index - previousEnd)));
}
UriTemplatePartType type = UriTemplatePartType.SimpleStringExpansion;
Group op = match.Groups["Operator"];
if (op.Success && op.Length > 0)
{
switch (op.Value)
{
case "+":
type = UriTemplatePartType.ReservedStringExpansion;
break;
case "#":
type = UriTemplatePartType.FragmentExpansion;
break;
case ".":
type = UriTemplatePartType.LabelExpansion;
break;
case "/":
type = UriTemplatePartType.PathSegments;
break;
case ";":
type = UriTemplatePartType.PathParameters;
break;
case "?":
type = UriTemplatePartType.Query;
break;
case "&":
type = UriTemplatePartType.QueryContinuation;
break;
case "=":
case ",":
case "!":
case "@":
case "|":
throw new NotSupportedException(string.Format("Operator is reserved for future expansion: {0}", op.Value));
default:
throw new InvalidOperationException("Unreachable");
}
}
Group variableList = match.Groups["VariableList"];
VariableReference[] variables;
if (variableList.Success)
{
string[] specs = variableList.Value.Split(',');
variables = new VariableReference[specs.Length];
for (int i = 0; i < specs.Length; i++)
{
variables[i] = VariableReference.Parse(specs[i]);
}
}
else
{
variables = new VariableReference[0];
}
UriTemplatePart part;
switch (type)
{
case UriTemplatePartType.SimpleStringExpansion:
part = new UriTemplatePartSimpleExpansion(variables, true);
break;
case UriTemplatePartType.ReservedStringExpansion:
part = new UriTemplatePartSimpleExpansion(variables, false);
break;
case UriTemplatePartType.FragmentExpansion:
part = new UriTemplatePartFragmentExpansion(variables);
break;
case UriTemplatePartType.LabelExpansion:
part = new UriTemplatePartLabelExpansion(variables);
break;
case UriTemplatePartType.PathSegments:
part = new UriTemplatePartPathSegmentExpansion(variables);
break;
case UriTemplatePartType.PathParameters:
part = new UriTemplatePartPathParametersExpansion(variables);
break;
case UriTemplatePartType.Query:
part = new UriTemplatePartQueryExpansion(variables, false);
break;
case UriTemplatePartType.QueryContinuation:
part = new UriTemplatePartQueryExpansion(variables, true);
break;
case UriTemplatePartType.Literal:
default:
throw new InvalidOperationException("Unreachable");
}
parts.Add(part);
previousEnd = match.Index + match.Length;
}
if (previousEnd < template.Length)
{
parts.Add(new UriTemplatePartLiteral(template.Substring(previousEnd)));
}
return(parts.ToArray());
}