public TemplateSegment(string template, string segment, bool isParameter)
{
IsParameter = isParameter;
// Process segments that are not parameters or do not contain
// a token separating a type constraint.
if (!isParameter || segment.IndexOf(':') < 0)
{
// Set the IsOptional flag to true for segments that contain
// a parameter with no type constraints but optionality set
// via the '?' token.
if (segment.IndexOf('?') == segment.Length - 1)
{
IsOptional = true;
Value = segment.Substring(0, segment.Length - 1);
}
// If the `?` optional marker shows up in the segment but not at the very end,
// then throw an error.
else if (segment.IndexOf('?') >= 0 && segment.IndexOf('?') != segment.Length - 1)
{
throw new ArgumentException($"Malformed parameter '{segment}' in route '{template}'. '?' character can only appear at the end of parameter name.");
}
else
{
Value = segment;
}
Constraints = Array.Empty <RouteConstraint>();
}
else
{
var tokens = segment.Split(':');
if (tokens[0].Length == 0)
{
throw new ArgumentException($"Malformed parameter '{segment}' in route '{template}' has no name before the constraints list.");
}
// Set the IsOptional flag to true if any type constraints
// for this parameter are designated as optional.
IsOptional = tokens.Skip(1).Any(token => token.EndsWith("?"));
Value = tokens[0];
Constraints = tokens.Skip(1)
.Select(token => RouteConstraint.Parse(template, segment, token))
.ToArray();
}
}
public TemplateSegment(string template, string segment, bool isParameter)
{
IsParameter = isParameter;
IsCatchAll = segment.StartsWith('*');
if (IsCatchAll)
{
// Only one '*' currently allowed
Value = segment.Substring(1);
var invalidCharacter = Value.IndexOf('*');
if (Value.IndexOf('*') != -1)
{
throw new InvalidOperationException($"Invalid template '{template}'. A catch-all parameter may only have one '*' at the beginning of the segment.");
}
}
else
{
Value = segment;
}
// Process segments that are not parameters or do not contain
// a token separating a type constraint.
if (!isParameter || Value.IndexOf(':') < 0)
{
// Set the IsOptional flag to true for segments that contain
// a parameter with no type constraints but optionality set
// via the '?' token.
if (Value.IndexOf('?') == Value.Length - 1)
{
IsOptional = true;
Value = Value.Substring(0, Value.Length - 1);
}
// If the `?` optional marker shows up in the segment but not at the very end,
// then throw an error.
else if (Value.IndexOf('?') >= 0 && Value.IndexOf('?') != Value.Length - 1)
{
throw new ArgumentException($"Malformed parameter '{segment}' in route '{template}'. '?' character can only appear at the end of parameter name.");
}
Constraints = Array.Empty <RouteConstraint>();
}
else
{
var tokens = Value.Split(':');
if (tokens[0].Length == 0)
{
throw new ArgumentException($"Malformed parameter '{segment}' in route '{template}' has no name before the constraints list.");
}
// Set the IsOptional flag to true if any type constraints
// for this parameter are designated as optional.
IsOptional = tokens.Skip(1).Any(token => token.EndsWith('?'));
Value = tokens[0];
Constraints = tokens.Skip(1)
.Select(token => RouteConstraint.Parse(template, segment, token))
.ToArray();
}
if (IsParameter)
{
if (IsOptional && IsCatchAll)
{
throw new InvalidOperationException($"Invalid segment '{segment}' in route '{template}'. A catch-all parameter cannot be marked optional.");
}
// Moving the check for this here instead of TemplateParser so we can allow catch-all.
// We checked for '*' up above specifically for catch-all segments, this one checks for all others
if (Value.IndexOf('*') != -1)
{
throw new InvalidOperationException($"Invalid template '{template}'. The character '*' in parameter segment '{{{segment}}}' is not allowed.");
}
}
}