/// <summary>
/// Determines if the segment signature is valid
/// </summary>
/// <param name="signature">The segment signature</param>
/// <returns>True, if it is valid; otherwise false</returns>
/// <remarks>
/// The segment signature is valid if it only contains
/// letters, numbers and optionally ends with an indexer.
/// </remarks>
public static bool IsValidSegment
(
string signature
)
{
if (String.IsNullOrWhiteSpace(signature))
{
return(false);
}
if (signature == @"$")
{
return(true);
}
var indexerInfo = new IndexerInfo
(
signature
);
signature = indexerInfo.PathWithoutIndexer;
var containsValidChars = signature.All
(
c => Char.IsLetter(c) ||
Char.IsNumber(c)
);
if (false == containsValidChars)
{
return(false);
}
return(true);
}
/// <summary>
/// Populates the segments details
/// </summary>
/// <param name="index">The segment index</param>
/// <param name="signature">The segment signature</param>
private void PopulateSegmentDetails
(
int index,
string signature
)
{
var isValid = PathSegmentInfo.IsValidSegment
(
signature
);
if (false == isValid)
{
throw new ArgumentException
(
"The path segment '{0}' is invalid.".With
(
signature
)
);
}
var indexerInfo = new IndexerInfo
(
signature
);
this.Index = index;
this.Signature = signature;
this.Name = indexerInfo.PathWithoutIndexer;
this.IndexerInfo = indexerInfo;
this.IsModelPointer = TemplateContext.IsModelReference
(
indexerInfo.PathWithoutIndexer
);
}
/// <summary>
/// Populates the indexer details based on the binding path
/// </summary>
/// <param name="path">The binding path</param>
/// <param name="signatureIndex">THe signature index</param>
private void PopulateIndexerDetails
(
string path,
int signatureIndex = 0
)
{
if (path.StartsWith(@".") && path.Length > 1)
{
path = path.Crop(1);
}
var extractedSignatures = ExtractIndexerSignatures
(
path
);
if (extractedSignatures.Length == 0)
{
this.HasIndexer = false;
this.ResolvedIndex = -1;
this.PathWithoutIndexer = path;
this.FullPath = path;
}
else
{
var signature = extractedSignatures[signatureIndex];
if (signature.Length > 2)
{
signature = signature.Crop
(
1,
signature.Length - 2
);
}
var valueResolver = new NettleValueResolver();
var valueType = valueResolver.ResolveType
(
signature
);
switch (valueType)
{
case NettleValueType.Number:
{
this.ResolvedIndex = Int32.Parse(signature);
break;
}
case NettleValueType.Variable:
{
this.ResolvedIndex = -1;
break;
}
default:
{
var message = "The indexer '{0}' for '{1}' is invalid.";
var position = (path.Length - signature.Length);
throw new NettleParseException
(
message.With(signature, path),
position
);
}
}
var indexerSequence = String.Empty;
var trimSequence = String.Empty;
for (var i = 0; i < extractedSignatures.Length; i++)
{
indexerSequence += extractedSignatures[i];
if (i > signatureIndex)
{
trimSequence += extractedSignatures[i];
}
}
this.HasIndexer = true;
this.IndexerValueType = valueType;
this.IndexerSignature = signature;
this.PathWithoutIndexer = path.Substring
(
0,
path.Length - indexerSequence.Length
);
this.FullPath = path.Substring
(
0,
path.Length - trimSequence.Length
);
if (signatureIndex < extractedSignatures.Length - 1)
{
this.NextIndexer = new IndexerInfo
(
path,
signatureIndex + 1
);
}
}
}