public ParametricUriSegment(string expression)
{
if (string.IsNullOrEmpty(expression))
throw new ArgumentNullException("expression");
if (expression.Contains('/'))
throw new ArgumentException("Uri segment expression cannot contains '/' characters.");
_paramExpression = ParseExpression(expression);
_segmentRegEx = CreateRegex(_paramExpression);
}
static ParametricUriSegmentExpression ParseExpression(string expression)
{
var paramExpression = new ParametricUriSegmentExpression() { Expression = expression };
var match = PARAMETER_NAME_REGEX.Match(expression);
if (!match.Success)
{
paramExpression.IsParametric = false;
paramExpression.ParameterName = null;
paramExpression.Prefix = null;
paramExpression.Suffix = null;
paramExpression.CatchAll = false;
}
else
{
paramExpression.IsParametric = true;
paramExpression.ParameterName = match.Groups["name"].Value;
paramExpression.Prefix = match.Groups["prefix"].Value;
paramExpression.Suffix = match.Groups["suffix"].Value;
paramExpression.CatchAll = match.Groups["catchAll"].Success;
}
return paramExpression;
}
static Regex CreateParametricRegex(ParametricUriSegmentExpression paramExpression)
{
string valuePattern;
if (paramExpression.CatchAll)
valuePattern = VALUE_CATCH_ALL;
else
valuePattern = VALUE_CATCH_SEGMENT;
return CreateBaseRegex(paramExpression.Prefix, valuePattern, paramExpression.Suffix, paramExpression.CatchAll);
}
static Regex CreateRegex(ParametricUriSegmentExpression paramExpression)
{
if (paramExpression.IsParametric)
return CreateParametricRegex(paramExpression);
else
return CreateFixedRegex(paramExpression);
}
static Regex CreateFixedRegex(ParametricUriSegmentExpression paramExpression)
{
string valuePattern = Regex.Escape(paramExpression.Expression);
return CreateBaseRegex(paramExpression.Prefix, valuePattern, paramExpression.Suffix, paramExpression.CatchAll);
}