public FilterPattern(string filter)
{
if (filter == null)
{
throw new ArgumentNullException(nameof(filter));
}
if (filter.IndexOf(UPath.DirectorySeparator) >= 0)
{
throw new ArgumentException("Filter cannot contain directory parts.", nameof(filter));
}
this._exactMatch = null;
this._regexMatch = null;
// Optimized path, most common cases
if (filter == "" || filter == "*" || filter == "*.*")
{
return;
}
var appendSpecialCaseForWildcardExt = false;
var startIndex = 0;
StringBuilder builder = null;
try
{
int nextIndex;
while ((nextIndex = filter.IndexOfAny(SpecialChars, startIndex)) >= 0)
{
if (builder == null)
{
builder = UPath.GetSharedStringBuilder();
builder.Append("^");
}
var lengthToEscape = nextIndex - startIndex;
if (lengthToEscape > 0)
{
var toEscape = Regex.Escape(filter.Substring(startIndex, lengthToEscape));
builder.Append(toEscape);
}
var c = filter[nextIndex];
// special case for wildcard file extension to allow blank extensions as well
if (c == '.' && nextIndex == filter.Length - 2 && filter[nextIndex + 1] == '*')
{
appendSpecialCaseForWildcardExt = true;
break;
}
var regexPatternPart =
c == '.' ? "\\." : c == '*' ? ".*?" : ".";
builder.Append(regexPatternPart);
startIndex = nextIndex + 1;
}
if (builder == null)
{
this._exactMatch = filter;
}
else
{
if (appendSpecialCaseForWildcardExt)
{
builder.Append("(\\.[^.]*)?");
}
else
{
var length = filter.Length - startIndex;
if (length > 0)
{
var toEscape = Regex.Escape(filter.Substring(startIndex, length));
builder.Append(toEscape);
}
}
builder.Append("$");
var regexPattern = builder.ToString();
this._regexMatch = new Regex(regexPattern);
}
}
finally
{
if (builder != null)
{
builder.Length = 0;
}
}
}
private SearchPattern(ref UPath path, ref string searchPattern)
{
path.AssertAbsolute();
if (searchPattern == null)
{
throw new ArgumentNullException(nameof(searchPattern));
}
_exactMatch = null;
_regexMatch = null;
// Optimized path, most common case
if (searchPattern == "*")
{
return;
}
if (searchPattern.StartsWith("/"))
{
throw new ArgumentException($"The search pattern `{searchPattern}` cannot start by an absolute path `/`");
}
searchPattern = searchPattern.Replace('\\', '/');
// If the path contains any directory, we need to concatenate the directory part with the input path
if (searchPattern.IndexOf('/') > 0)
{
var pathPattern = new UPath(searchPattern);
var directory = pathPattern.GetDirectory();
if (!directory.IsNull && !directory.IsEmpty)
{
path = path / directory;
}
searchPattern = pathPattern.GetName();
// If the search pattern is again a plain any, optimized path
if (searchPattern == "*")
{
return;
}
}
var startIndex = 0;
int nextIndex;
StringBuilder builder = null;
try
{
while ((nextIndex = searchPattern.IndexOfAny(SpecialChars, startIndex)) >= 0)
{
if (builder == null)
{
builder = UPath.GetSharedStringBuilder();
builder.Append("^");
}
var lengthToEscape = nextIndex - startIndex;
if (lengthToEscape > 0)
{
var toEscape = Regex.Escape(searchPattern.Substring(startIndex, lengthToEscape));
builder.Append(toEscape);
}
var c = searchPattern[nextIndex];
var regexPatternPart = c == '*' ? "[^/]*" : "[^/]";
builder.Append(regexPatternPart);
startIndex = nextIndex + 1;
}
if (builder == null)
{
_exactMatch = searchPattern;
}
else
{
var length = searchPattern.Length - startIndex;
if (length > 0)
{
var toEscape = Regex.Escape(searchPattern.Substring(startIndex, length));
builder.Append(toEscape);
}
builder.Append("$");
var regexPattern = builder.ToString();
_regexMatch = new Regex(regexPattern);
}
}
finally
{
if (builder != null)
{
builder.Length = 0;
}
}
}
private SearchPattern(ref UPath path, ref string searchPattern)
{
path.AssertAbsolute();
if (searchPattern == null)
{
throw new ArgumentNullException(nameof(searchPattern));
}
_exactMatch = null;
_regexMatch = null;
// Optimized path, most common case
if (searchPattern == "*")
{
return;
}
if (searchPattern.StartsWith("/"))
{
throw new ArgumentException($"The search pattern `{searchPattern}` cannot start by an absolute path `/`");
}
searchPattern = searchPattern.Replace('\\', '/');
// If the path contains any directory, we need to concatenate the directory part with the input path
if (searchPattern.IndexOf('/') > 0)
{
var pathPattern = new UPath(searchPattern);
var directory = pathPattern.GetDirectory();
if (!directory.IsNull && !directory.IsEmpty)
{
path = path / directory;
}
searchPattern = pathPattern.GetName();
// If the search pattern is again a plain any, optimized path
if (searchPattern == "*")
{
return;
}
}
bool appendSpecialCaseForExt3Chars = false;
var startIndex = 0;
int nextIndex;
StringBuilder builder = null;
try
{
while ((nextIndex = searchPattern.IndexOfAny(SpecialChars, startIndex)) >= 0)
{
if (builder == null)
{
builder = UPath.GetSharedStringBuilder();
builder.Append("^");
}
var lengthToEscape = nextIndex - startIndex;
if (lengthToEscape > 0)
{
var toEscape = Regex.Escape(searchPattern.Substring(startIndex, lengthToEscape));
builder.Append(toEscape);
}
var c = searchPattern[nextIndex];
var regexPatternPart = c == '*' ? "[^/]*" : "[^/]";
builder.Append(regexPatternPart);
// If the specified extension is exactly three characters long,
// the method returns files with extensions that begin with the specified extension.
// For example, "*.xls" returns both "book.xls" and "book.xlsx".
// 012345
// *.txt
if (c == '*' && nextIndex + 5 == searchPattern.Length && searchPattern[nextIndex + 1] == '.' && searchPattern.IndexOf('.', nextIndex + 2) < 0)
{
appendSpecialCaseForExt3Chars = true;
}
startIndex = nextIndex + 1;
}
if (builder == null)
{
_exactMatch = searchPattern;
}
else
{
var length = searchPattern.Length - startIndex;
if (length > 0)
{
var toEscape = Regex.Escape(searchPattern.Substring(startIndex, length));
builder.Append(toEscape);
}
if (appendSpecialCaseForExt3Chars)
{
builder.Append("[^/]*");
}
builder.Append("$");
var regexPattern = builder.ToString();
_regexMatch = new Regex(regexPattern);
}
}
finally
{
if (builder != null)
{
builder.Length = 0;
}
}
}
