public void Parse_OptionalParameter()
{
// Arrange
var template = "{p?}";
var builder = RoutePatternBuilder.Create(template);
builder.AddPathSegmentFromText("{p?}", RoutePatternPart.CreateParameterFromText("{p?}", "p", null, RoutePatternParameterKind.Optional));
var expected = builder.Build();
// Act
var actual = RoutePatternParser.Parse(template);
// Assert
Assert.Equal <RoutePattern>(expected, actual, new RoutePatternEqualityComparer());
}
public void Parse_SingleLiteral()
{
// Arrange
var template = "cool";
var builder = RoutePatternBuilder.Create(template);
builder.AddPathSegmentFromText("cool", RoutePatternPart.CreateLiteralFromText("cool", "cool"));
var expected = builder.Build();
// Act
var actual = RoutePatternParser.Parse(template);
// Assert
Assert.Equal <RoutePattern>(expected, actual, new RoutePatternEqualityComparer());
}
public void Parse_MultipleParameters()
{
// Arrange
var template = "{p1}/{p2}/{*p3}";
var builder = RoutePatternBuilder.Create(template);
builder.AddPathSegmentFromText("{p1}", RoutePatternPart.CreateParameterFromText("{p1}", "p1"));
builder.AddPathSegmentFromText("{p2}", RoutePatternPart.CreateParameterFromText("{p2}", "p2"));
builder.AddPathSegmentFromText("{*p3}", RoutePatternPart.CreateParameterFromText("{*p3}", "p3", null, RoutePatternParameterKind.CatchAll));
var expected = builder.Build();
// Act
var actual = RoutePatternParser.Parse(template);
// Assert
Assert.Equal <RoutePattern>(expected, actual, new RoutePatternEqualityComparer());
}
public void Parse_ComplexSegment_OptionalParameterFollowingPeriod_PeriodAfterSlash()
{
// Arrange
var template = "{p2}/.{p3?}";
var builder = RoutePatternBuilder.Create(template);
builder.AddPathSegmentFromText("{p2}", RoutePatternPart.CreateParameterFromText("{p2}", "p2"));
builder.AddPathSegmentFromText(".{p3?}",
RoutePatternPart.CreateSeparatorFromText(".", "."),
RoutePatternPart.CreateParameterFromText("{p3?}", "p3", null, RoutePatternParameterKind.Optional));
var expected = builder.Build();
// Act
var actual = RoutePatternParser.Parse(template);
// Assert
Assert.Equal <RoutePattern>(expected, actual, new RoutePatternEqualityComparer());
}
public void Parse_ComplexSegment_ParametersFollowingPeriod()
{
// Arrange
var template = "{p1}.{p2}";
var builder = RoutePatternBuilder.Create(template);
builder.AddPathSegmentFromText(
"{p1}.{p2}",
RoutePatternPart.CreateParameterFromText("{p1}", "p1"),
RoutePatternPart.CreateLiteralFromText(".", "."),
RoutePatternPart.CreateParameterFromText("{p2}", "p2"));
var expected = builder.Build();
// Act
var actual = RoutePatternParser.Parse(template);
// Assert
Assert.Equal <RoutePattern>(expected, actual, new RoutePatternEqualityComparer());
}
public void Parse_ComplexSegment_LPL()
{
// Arrange
var template = "cool-{p1}-awesome";
var builder = RoutePatternBuilder.Create(template);
builder.AddPathSegmentFromText(
template,
RoutePatternPart.CreateLiteralFromText("cool-", "cool-"),
RoutePatternPart.CreateParameterFromText("{p1}", "p1"),
RoutePatternPart.CreateLiteralFromText("-awesome", "-awesome"));
var expected = builder.Build();
// Act
var actual = RoutePatternParser.Parse(template);
// Assert
Assert.Equal <RoutePattern>(expected, actual, new RoutePatternEqualityComparer());
}
[InlineData(@"{p1:regex(([{{(])\w+)}", @"regex(([{(])\w+)")] // Not balanced {
public void Parse_RegularExpressions(string template, string constraint)
{
// Arrange
var builder = RoutePatternBuilder.Create(template);
builder.AddPathSegmentFromText(
template,
RoutePatternPart.CreateParameterFromText(
template,
"p1",
null,
RoutePatternParameterKind.Standard,
ConstraintReference.CreateFromText(constraint, constraint)));
var expected = builder.Build();
// Act
var actual = RoutePatternParser.Parse(template);
// Assert
Assert.Equal <RoutePattern>(expected, actual, new RoutePatternEqualityComparer());
}
private bool Equals(RoutePatternPart x, RoutePatternPart y)
{
if (x.GetType() != y.GetType())
{
return(false);
}
if (x.IsLiteral && y.IsLiteral)
{
return(Equals((RoutePatternLiteral)x, (RoutePatternLiteral)y));
}
else if (x.IsParameter && y.IsParameter)
{
return(Equals((RoutePatternParameter)x, (RoutePatternParameter)y));
}
else if (x.IsSeparator && y.IsSeparator)
{
return(Equals((RoutePatternSeparator)x, (RoutePatternSeparator)y));
}
Debug.Fail("This should not be reachable. Do you need to update the comparison logic?");
return(false);
}
private static bool IsSegmentValid(TemplateParserContext context, List <RoutePatternPart> parts)
{
// If a segment has multiple parts, then it can't contain a catch all.
for (var i = 0; i < parts.Count; i++)
{
var part = parts[i];
if (part.IsParameter && ((RoutePatternParameter)part).IsCatchAll && 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 < parts.Count; i++)
{
var part = parts[i];
if (part.IsParameter && ((RoutePatternParameter)part).IsOptional && parts.Count > 1)
{
// This optional parameter is the last part in the segment
if (i == parts.Count - 1)
{
var previousPart = parts[i - 1];
if (!previousPart.IsLiteral && !previousPart.IsSeparator)
{
// The optional parameter is preceded by something that is not a literal or separator
// Example of error message:
// "In the segment '{RouteValue}{param?}', the optional parameter 'param' is preceded
// by an invalid segment '{RouteValue}'. Only a period (.) can precede an optional parameter.
context.Error = string.Format(
Resources.TemplateRoute_OptionalParameterCanbBePrecededByPeriod,
RoutePatternPathSegment.DebuggerToString(parts),
((RoutePatternParameter)part).Name,
parts[i - 1].DebuggerToString());
return(false);
}
else if (previousPart is RoutePatternLiteral literal && literal.Content != PeriodString)
{
// The optional parameter is preceded by a literal other than period.
// Example of error message:
// "In the segment '{RouteValue}-{param?}', the optional parameter 'param' is preceded
// by an invalid segment '-'. Only a period (.) can precede an optional parameter.
context.Error = string.Format(
Resources.TemplateRoute_OptionalParameterCanbBePrecededByPeriod,
RoutePatternPathSegment.DebuggerToString(parts),
((RoutePatternParameter)part).Name,
parts[i - 1].DebuggerToString());
return(false);
}
parts[i - 1] = RoutePatternPart.CreateSeparatorFromText(previousPart.RawText, ((RoutePatternLiteral)previousPart).Content);
}
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 ')'
context.Error = string.Format(
Resources.TemplateRoute_OptionalParameterHasTobeTheLast,
RoutePatternPathSegment.DebuggerToString(parts),
((RoutePatternParameter)part).Name,
parts[i + 1].DebuggerToString());
return(false);
}
}
}
// A segment cannot contain two consecutive parameters
var isLastSegmentParameter = false;
for (var i = 0; i < parts.Count; i++)
{
var part = parts[i];
if (part.IsParameter && isLastSegmentParameter)
{
context.Error = Resources.TemplateRoute_CannotHaveConsecutiveParameters;
return(false);
}
isLastSegmentParameter = part.IsParameter;
}
return(true);
}
private static bool ParseLiteral(TemplateParserContext context, List <RoutePatternPart> parts)
{
context.Mark();
while (true)
{
if (context.Current == Separator)
{
// End of the segment
break;
}
else if (context.Current == OpenBrace)
{
if (!context.MoveNext())
{
// 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.
context.Back();
break;
}
}
else if (context.Current == CloseBrace)
{
if (!context.MoveNext())
{
// 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.MoveNext())
{
break;
}
}
var encoded = context.Capture();
var decoded = encoded.Replace("}}", "}").Replace("{{", "{");
if (IsValidLiteral(context, decoded))
{
parts.Add(RoutePatternPart.CreateLiteralFromText(encoded, decoded));
return(true);
}
else
{
return(false);
}
}