private static bool ParseLiteral(TemplateParserContext context, TemplateSegment segment)
{
context.Mark();
string encoded;
while (true)
{
if (context.Current == Separator)
{
encoded = context.Capture();
context.Back();
break;
}
else if (context.Current == OpenBrace)
{
if (!context.Next())
{
// This is a dangling open-brace, which is not allowed
context.Error = Resources.TemplateRoute_MismatchedParameter;
return false;
}
if (context.Current == OpenBrace)
{
// This is an 'escaped' brace in a literal, like "{{foo" - keep going.
}
else
{
// We've just seen the start of a parameter, so back up and return
context.Back();
encoded = context.Capture();
context.Back();
break;
}
}
else if (context.Current == CloseBrace)
{
if (!context.Next())
{
// This is a dangling close-brace, which is not allowed
context.Error = Resources.TemplateRoute_MismatchedParameter;
return false;
}
if (context.Current == CloseBrace)
{
// This is an 'escaped' brace in a literal, like "{{foo" - keep going.
}
else
{
// This is an unbalanced close-brace, which is not allowed
context.Error = Resources.TemplateRoute_MismatchedParameter;
return false;
}
}
if (!context.Next())
{
encoded = context.Capture();
break;
}
}
var decoded = encoded.Replace("}}", "}").Replace("{{", "{");
if (IsValidLiteral(context, decoded))
{
segment.Parts.Add(TemplatePart.CreateLiteral(decoded));
return true;
}
else
{
return false;
}
}
private static bool ParseParameter(TemplateParserContext context, TemplateSegment segment)
{
context.Mark();
while (true)
{
if (context.Current == OpenBrace)
{
// This is an open brace inside of a parameter, it has to be escaped
if (context.Next())
{
if (context.Current != OpenBrace)
{
// If we see something like "{p1:regex(^\d{3", we will come here.
context.Error = Resources.TemplateRoute_UnescapedBrace;
return false;
}
}
else
{
// This is a dangling open-brace, which is not allowed
// Example: "{p1:regex(^\d{"
context.Error = Resources.TemplateRoute_MismatchedParameter;
return false;
}
}
else if (context.Current == CloseBrace)
{
// When we encounter Closed brace here, it either means end of the parameter or it is a closed
// brace in the parameter, in that case it needs to be escaped.
// Example: {p1:regex(([}}])\w+}. First pair is escaped one and last marks end of the parameter
if (!context.Next())
{
// This is the end of the string -and we have a valid parameter
context.Back();
break;
}
if (context.Current == CloseBrace)
{
// This is an 'escaped' brace in a parameter name
}
else
{
// This is the end of the parameter
context.Back();
break;
}
}
if (!context.Next())
{
// This is a dangling open-brace, which is not allowed
context.Error = Resources.TemplateRoute_MismatchedParameter;
return false;
}
}
var rawParameter = context.Capture();
var decoded = rawParameter.Replace("}}", "}").Replace("{{", "{");
// At this point, we need to parse the raw name for inline constraint,
// default values and optional parameters.
var templatePart = InlineRouteParameterParser.ParseRouteParameter(decoded);
if (templatePart.IsCatchAll && templatePart.IsOptional)
{
context.Error = Resources.TemplateRoute_CatchAllCannotBeOptional;
return false;
}
if (templatePart.IsOptional && templatePart.DefaultValue != null)
{
// Cannot be optional and have a default value.
// The only way to declare an optional parameter is to have a ? at the end,
// hence we cannot have both default value and optional parameter within the template.
// A workaround is to add it as a separate entry in the defaults argument.
context.Error = Resources.TemplateRoute_OptionalCannotHaveDefaultValue;
return false;
}
var parameterName = templatePart.Name;
if (IsValidParameterName(context, parameterName))
{
segment.Parts.Add(templatePart);
return true;
}
else
{
return false;
}
}
private static bool ParseParameter(TemplateParserContext context, TemplateSegment segment)
{
context.Mark();
while (true)
{
if (context.Current == Separator)
{
// This is a dangling open-brace, which is not allowed
context.Error = Resources.TemplateRoute_MismatchedParameter;
return(false);
}
else if (context.Current == OpenBrace)
{
// If we see a '{' while parsing a parameter name it's invalid. We'll just accept it for now
// and let the validation code for the name find it.
}
else if (context.Current == CloseBrace)
{
if (!context.Next())
{
// This is the end of the string - and we have a valid parameter
context.Back();
break;
}
if (context.Current == CloseBrace)
{
// This is an 'escaped' brace in a parameter name, which is not allowed.
// We'll just accept it for now and let the validation code for the name find it.
}
else
{
// This is the end of the parameter
context.Back();
break;
}
}
if (!context.Next())
{
// This is a dangling open-brace, which is not allowed
context.Error = Resources.TemplateRoute_MismatchedParameter;
return(false);
}
}
var rawParameter = context.Capture();
// At this point, we need to parse the raw name for inline constraint,
// default values and optional parameters.
var templatePart = InlineRouteParameterParser.ParseRouteParameter(rawParameter);
if (templatePart.IsCatchAll && templatePart.IsOptional)
{
context.Error = Resources.TemplateRoute_CatchAllCannotBeOptional;
return(false);
}
if (templatePart.IsOptional && templatePart.DefaultValue != null)
{
// Cannot be optional and have a default value.
// The only way to declare an optional parameter is to have a ? at the end,
// hence we cannot have both default value and optional parameter within the template.
// A workaround is to add it as a separate entry in the defaults argument.
context.Error = Resources.TemplateRoute_OptionalCannotHaveDefaultValue;
return(false);
}
var parameterName = templatePart.Name;
if (IsValidParameterName(context, parameterName))
{
segment.Parts.Add(templatePart);
return(true);
}
else
{
return(false);
}
}
private static bool ParseLiteral(TemplateParserContext context, TemplateSegment segment)
{
context.Mark();
string encoded;
while (true)
{
if (context.Current == Separator)
{
encoded = context.Capture();
context.Back();
break;
}
else if (context.Current == OpenBrace)
{
if (!context.Next())
{
// This is a dangling open-brace, which is not allowed
context.Error = Resources.TemplateRoute_MismatchedParameter;
return(false);
}
if (context.Current == OpenBrace)
{
// This is an 'escaped' brace in a literal, like "{{foo" - keep going.
}
else
{
// We've just seen the start of a parameter, so back up and return
context.Back();
encoded = context.Capture();
context.Back();
break;
}
}
else if (context.Current == CloseBrace)
{
if (!context.Next())
{
// This is a dangling close-brace, which is not allowed
context.Error = Resources.TemplateRoute_MismatchedParameter;
return(false);
}
if (context.Current == CloseBrace)
{
// This is an 'escaped' brace in a literal, like "{{foo" - keep going.
}
else
{
// This is an unbalanced close-brace, which is not allowed
context.Error = Resources.TemplateRoute_MismatchedParameter;
return(false);
}
}
if (!context.Next())
{
encoded = context.Capture();
break;
}
}
var decoded = encoded.Replace("}}", "}").Replace("{{", "}");
if (IsValidLiteral(context, decoded))
{
segment.Parts.Add(TemplatePart.CreateLiteral(decoded));
return(true);
}
else
{
return(false);
}
}
private static bool ParseParameter(TemplateParserContext context, TemplateSegment segment)
{
context.Mark();
while (true)
{
if (context.Current == OpenBrace)
{
// This is an open brace inside of a parameter, it has to be escaped
if (context.Next())
{
if (context.Current != OpenBrace)
{
// If we see something like "{p1:regex(^\d{3", we will come here.
context.Error = Resources.TemplateRoute_UnescapedBrace;
return(false);
}
}
else
{
// This is a dangling open-brace, which is not allowed
// Example: "{p1:regex(^\d{"
context.Error = Resources.TemplateRoute_MismatchedParameter;
return(false);
}
}
else if (context.Current == CloseBrace)
{
// When we encounter Closed brace here, it either means end of the parameter or it is a closed
// brace in the parameter, in that case it needs to be escaped.
// Example: {p1:regex(([}}])\w+}. First pair is escaped one and last marks end of the parameter
if (!context.Next())
{
// This is the end of the string -and we have a valid parameter
context.Back();
break;
}
if (context.Current == CloseBrace)
{
// This is an 'escaped' brace in a parameter name
}
else
{
// This is the end of the parameter
context.Back();
break;
}
}
if (!context.Next())
{
// This is a dangling open-brace, which is not allowed
context.Error = Resources.TemplateRoute_MismatchedParameter;
return(false);
}
}
var rawParameter = context.Capture();
var decoded = rawParameter.Replace("}}", "}").Replace("{{", "{");
// At this point, we need to parse the raw name for inline constraint,
// default values and optional parameters.
var templatePart = InlineRouteParameterParser.ParseRouteParameter(decoded);
if (templatePart.IsCatchAll && templatePart.IsOptional)
{
context.Error = Resources.TemplateRoute_CatchAllCannotBeOptional;
return(false);
}
if (templatePart.IsOptional && templatePart.DefaultValue != null)
{
// Cannot be optional and have a default value.
// The only way to declare an optional parameter is to have a ? at the end,
// hence we cannot have both default value and optional parameter within the template.
// A workaround is to add it as a separate entry in the defaults argument.
context.Error = Resources.TemplateRoute_OptionalCannotHaveDefaultValue;
return(false);
}
var parameterName = templatePart.Name;
if (IsValidParameterName(context, parameterName))
{
segment.Parts.Add(templatePart);
return(true);
}
else
{
return(false);
}
}
