protected override void Search(ref NativeMethods.SearchParams searchParams)
{
var start = searchParams.TextStart;
if (searchParams.MatchStart != IntPtr.Zero)
{
start = searchParams.MatchStart + searchParams.MatchLength * sizeof(char);
}
var end = searchParams.TextStart + searchParams.TextLength * sizeof(char);
var count = Pointers.Offset64(start, end) / sizeof(char);
var searchHitPtr = NativeMethods.Utf16_Search(
start,
count,
_patternPtr.Pointer,
_patternLength,
_searchOptions);
if (searchHitPtr == IntPtr.Zero)
{
searchParams.MatchStart = IntPtr.Zero;
searchParams.MatchLength = 0;
}
else
{
searchParams.MatchStart = searchHitPtr;
searchParams.MatchLength = _patternLength;
}
}
private unsafe List <TextRange> FindWorker(
TextFragment textFragment,
Func <TextRange, TextRange?> postProcess,
IOperationProgressTracker progressTracker,
int maxResultSize)
{
List <TextRange> result = null;
// Note: From C# spec: If E is zero, then no allocation is made, and
// the pointer returned is implementation-defined.
byte *searchBuffer = stackalloc byte[this.SearchBufferSize];
var searchParams = new NativeMethods.SearchParams {
TextStart = textFragment.StartPtr,
TextLength = textFragment.Length,
SearchBuffer = new IntPtr(searchBuffer),
};
while (true)
{
// Perform next search
Search(ref searchParams);
if (searchParams.MatchStart == IntPtr.Zero)
{
break;
}
// Convert match from *byte* pointers to a *text* range
var matchFragment = textFragment.Sub(searchParams.MatchStart, searchParams.MatchLength);
var matchRange = new TextRange(matchFragment.Position, matchFragment.Length);
// Post process match, maybe skipping it
var postMatchRange = postProcess(matchRange);
if (postMatchRange == null)
{
continue;
}
matchRange = postMatchRange.Value;
// Add to result collection
if (result == null)
{
result = new List <TextRange>();
}
result.Add(matchRange);
// Check it is time to end processing early.
maxResultSize--;
progressTracker.AddResults(1);
if (maxResultSize <= 0 || progressTracker.ShouldEndProcessing)
{
CancelSearch(ref searchParams);
break;
}
}
return(result ?? NoResult);
}
private unsafe List<TextRange> FindWorker(
TextFragment textFragment,
Func<TextRange, TextRange?> postProcess,
IOperationProgressTracker progressTracker,
int maxResultSize) {
List<TextRange> result = null;
// Note: From C# spec: If E is zero, then no allocation is made, and
// the pointer returned is implementation-defined.
byte* searchBuffer = stackalloc byte[this.SearchBufferSize];
var searchParams = new NativeMethods.SearchParams {
TextStart = textFragment.StartPtr,
TextLength = textFragment.Length,
SearchBuffer = new IntPtr(searchBuffer),
};
while (true) {
// Perform next search
Search(ref searchParams);
if (searchParams.MatchStart == IntPtr.Zero)
break;
// Convert match from *byte* pointers to a *text* range
var matchFragment = textFragment.Sub(searchParams.MatchStart, searchParams.MatchLength);
var matchRange = new TextRange(matchFragment.Position, matchFragment.Length);
// Post process match, maybe skipping it
var postMatchRange = postProcess(matchRange);
if (postMatchRange == null)
continue;
matchRange = postMatchRange.Value;
// Add to result collection
if (result == null)
result = new List<TextRange>();
result.Add(matchRange);
// Check it is time to end processing early.
maxResultSize--;
progressTracker.AddResults(1);
if (maxResultSize <= 0 || progressTracker.ShouldEndProcessing) {
CancelSearch(ref searchParams);
break;
}
}
return result ?? NoResult;
}
protected override void CancelSearch(ref NativeMethods.SearchParams searchParams)
{
// Nothing to do.
}
/// <summary> /// If the search is abandonned before all hits have been found, this method /// is called to allow the implementation to cleanup intermediate data /// structures used by the implementation. /// </summary> protected abstract void CancelSearch(ref NativeMethods.SearchParams searchParams);
protected override void CancelSearch(ref NativeMethods.SearchParams searchParams)
{
NativeMethods.AsciiSearchAlgorithm_CancelSearch(_handle, ref searchParams);
}