public static bool TrySearch(IDataModel data, ModelDelta changeToken, string originalFormat, out ArrayRun self, Func <IFormattedRun, bool> runFilter = null)
{
self = null;
var format = originalFormat;
var allowPointersToEntries = format.StartsWith(AnchorStart.ToString());
if (allowPointersToEntries)
{
format = format.Substring(1);
}
var closeArray = format.LastIndexOf(ArrayEnd.ToString());
if (!format.StartsWith(ArrayStart.ToString()) || closeArray == -1)
{
throw new ArrayRunParseException($"Array Content must be wrapped in {ArrayStart}{ArrayEnd}");
}
var segments = format.Substring(1, closeArray - 1);
var length = format.Substring(closeArray + 1);
var elementContent = ParseSegments(segments, data);
if (elementContent.Count == 0)
{
return(false);
}
var elementLength = elementContent.Sum(e => e.Length);
using (ModelCacheScope.CreateScope(data)) {
if (string.IsNullOrEmpty(length))
{
var bestAddress = StandardSearch(data, elementContent, elementLength, out int bestLength, runFilter);
if (bestAddress == Pointer.NULL)
{
return(false);
}
self = new ArrayRun(data, originalFormat + bestLength, string.Empty, bestAddress, bestLength, elementContent, data.GetNextRun(bestAddress).PointerSources, null);
}
else
{
var bestAddress = KnownLengthSearch(data, elementContent, elementLength, length, out int bestLength, runFilter);
if (bestAddress == Pointer.NULL)
{
return(false);
}
var lengthFromAnchor = int.TryParse(length, out var _) ? string.Empty : length;
self = new ArrayRun(data, originalFormat, lengthFromAnchor, bestAddress, bestLength, elementContent, data.GetNextRun(bestAddress).PointerSources, null);
}
}
if (allowPointersToEntries)
{
self = self.AddSourcesPointingWithinArray(changeToken);
}
return(true);
}
private ArrayRun(IDataModel data, string format, int start, IReadOnlyList <int> pointerSources) : base(start, pointerSources)
{
owner = data;
FormatString = format;
SupportsPointersToElements = format.StartsWith(AnchorStart.ToString());
if (SupportsPointersToElements)
{
format = format.Substring(1);
}
var closeArray = format.LastIndexOf(ArrayEnd.ToString());
if (!format.StartsWith(ArrayStart.ToString()) || closeArray == -1)
{
throw new ArrayRunParseException($"Array Content must be wrapped in {ArrayStart}{ArrayEnd}.");
}
var segments = format.Substring(1, closeArray - 1);
var length = format.Substring(closeArray + 1);
ElementContent = ParseSegments(segments, data);
if (ElementContent.Count == 0)
{
throw new ArrayRunParseException("Array Content must not be empty.");
}
ElementLength = ElementContent.Sum(e => e.Length);
FormatMatchFlags flags = default;
if (ElementContent.Count == 1)
{
flags |= FormatMatchFlags.IsSingleSegment;
}
if (length.Length == 0)
{
var nextRun = owner.GetNextRun(Start);
while (nextRun is NoInfoRun && nextRun.Start < owner.Count)
{
nextRun = owner.GetNextRun(nextRun.Start + 1);
}
var byteLength = 0;
var elementCount = 0;
while (Start + byteLength + ElementLength <= nextRun.Start && DataMatchesElementFormat(owner, Start + byteLength, ElementContent, flags, nextRun))
{
byteLength += ElementLength;
elementCount++;
}
LengthFromAnchor = string.Empty;
ElementCount = Math.Max(1, elementCount); // if the user said there's a format here, then there is, even if the format it wrong.
}
else if (int.TryParse(length, out int result))
{
// fixed length is easy
LengthFromAnchor = string.Empty;
ElementCount = Math.Max(1, result);
}
else
{
LengthFromAnchor = length;
ElementCount = Math.Max(1, ParseLengthFromAnchor());
}
Length = ElementLength * ElementCount;
}
