private static bool IsSegmentValid(TemplateParserContext context, TemplateSegment segment)
{
// If a segment has multiple parts, then it can't contain a catch all.
for (var i = 0; i < segment.Parts.Count; i++)
{
var part = segment.Parts[i];
if (part.IsParameter && part.IsCatchAll && segment.Parts.Count > 1)
{
context.Error = Resources.TemplateRoute_CannotHaveCatchAllInMultiSegment;
return false;
}
}
// if a segment has multiple parts, then only the last one parameter can be optional
// if it is following a optional seperator.
for (var i = 0; i < segment.Parts.Count; i++)
{
var part = segment.Parts[i];
if (part.IsParameter && part.IsOptional && segment.Parts.Count > 1)
{
// This optional parameter is the last part in the segment
if (i == segment.Parts.Count - 1)
{
Debug.Assert(segment.Parts[i - 1].IsLiteral);
// the optional parameter is preceded by a period
if (segment.Parts[i - 1].Text == PeriodString)
{
segment.Parts[i - 1].IsOptionalSeperator = true;
}
else
{
// The optional parameter is preceded by a literal other than period
// Example of error message:
// "In the complex segment {RouteValue}-{param?}, the optional parameter 'param'is preceded
// by an invalid segment "-". Only valid literal to precede an optional parameter is a
// period (.).
context.Error = string.Format(
Resources.TemplateRoute_OptionalParameterCanbBePrecededByPeriod,
segment.DebuggerToString(),
part.Name,
segment.Parts[i - 1].Text);
return false;
}
}
else
{
// This optional parameter is not the last one in the segment
// Example:
// An optional parameter must be at the end of the segment.In the segment '{RouteValue?})',
// optional parameter 'RouteValue' is followed by ')'
var nextPart = segment.Parts[i + 1];
var invalidPartText = nextPart.IsParameter ? nextPart.Name : nextPart.Text;
context.Error = string.Format(
Resources.TemplateRoute_OptionalParameterHasTobeTheLast,
segment.DebuggerToString(),
segment.Parts[i].Name,
invalidPartText
);
return false;
}
}
}
// A segment cannot contain two consecutive parameters
var isLastSegmentParameter = false;
for (var i = 0; i < segment.Parts.Count; i++)
{
var part = segment.Parts[i];
if (part.IsParameter && isLastSegmentParameter)
{
context.Error = Resources.TemplateRoute_CannotHaveConsecutiveParameters;
return false;
}
isLastSegmentParameter = part.IsParameter;
}
return true;
}
private static bool IsSegmentValid(TemplateParserContext context, TemplateSegment segment)
{
// If a segment has multiple parts, then it can't contain a catch all.
for (var i = 0; i < segment.Parts.Count; i++)
{
var part = segment.Parts[i];
if (part.IsParameter && part.IsCatchAll && segment.Parts.Count > 1)
{
context.Error = Resources.TemplateRoute_CannotHaveCatchAllInMultiSegment;
return(false);
}
}
// if a segment has multiple parts, then only the last one parameter can be optional
// if it is following a optional seperator.
for (var i = 0; i < segment.Parts.Count; i++)
{
var part = segment.Parts[i];
if (part.IsParameter && part.IsOptional && segment.Parts.Count > 1)
{
// This optional parameter is the last part in the segment
if (i == segment.Parts.Count - 1)
{
Debug.Assert(segment.Parts[i - 1].IsLiteral);
// the optional parameter is preceded by a period
if (segment.Parts[i - 1].Text == PeriodString)
{
segment.Parts[i - 1].IsOptionalSeperator = true;
}
else
{
// The optional parameter is preceded by a literal other than period
// Example of error message:
// "In the complex segment {RouteValue}-{param?}, the optional parameter 'param'is preceded
// by an invalid segment "-". Only valid literal to precede an optional parameter is a
// period (.).
context.Error = string.Format(
Resources.TemplateRoute_OptionalParameterCanbBePrecededByPeriod,
segment.DebuggerToString(),
part.Name,
segment.Parts[i - 1].Text);
return(false);
}
}
else
{
// This optional parameter is not the last one in the segment
// Example:
// An optional parameter must be at the end of the segment.In the segment '{RouteValue?})',
// optional parameter 'RouteValue' is followed by ')'
var nextPart = segment.Parts[i + 1];
var invalidPartText = nextPart.IsParameter ? nextPart.Name : nextPart.Text;
context.Error = string.Format(
Resources.TemplateRoute_OptionalParameterHasTobeTheLast,
segment.DebuggerToString(),
segment.Parts[i].Name,
invalidPartText
);
return(false);
}
}
}
// A segment cannot contain two consecutive parameters
var isLastSegmentParameter = false;
for (var i = 0; i < segment.Parts.Count; i++)
{
var part = segment.Parts[i];
if (part.IsParameter && isLastSegmentParameter)
{
context.Error = Resources.TemplateRoute_CannotHaveConsecutiveParameters;
return(false);
}
isLastSegmentParameter = part.IsParameter;
}
return(true);
}
