public static IPattern Build(string pattern)
{
if (pattern == null)
{
throw new ArgumentNullException("pattern");
}
pattern = pattern.TrimStart(_slashes);
if (pattern.TrimEnd(_slashes).Length < pattern.Length)
{
// If the pattern end with a slash, it is considered as
// a directory.
pattern = pattern.TrimEnd(_slashes) + "/**";
}
var allSegments = new List<IPathSegment>();
var isParentSegmentLegal = true;
IList<IPathSegment> segmentsPatternStartsWith = null;
IList<IList<IPathSegment>> segmentsPatternContains = null;
IList<IPathSegment> segmentsPatternEndsWith = null;
var endPattern = pattern.Length;
for (int scanPattern = 0; scanPattern < endPattern;)
{
var beginSegment = scanPattern;
var endSegment = NextIndex(pattern, _slashes, scanPattern, endPattern);
IPathSegment segment = null;
if (segment == null && endSegment - beginSegment == 3)
{
if (pattern[beginSegment] == '*' &&
pattern[beginSegment + 1] == '.' &&
pattern[beginSegment + 2] == '*')
{
// turn *.* into *
beginSegment += 2;
}
}
if (segment == null && endSegment - beginSegment == 2)
{
if (pattern[beginSegment] == '*' &&
pattern[beginSegment + 1] == '*')
{
// recognized **
segment = new RecursiveWildcardSegment();
}
else if (pattern[beginSegment] == '.' &&
pattern[beginSegment + 1] == '.')
{
// recognized ..
if (!isParentSegmentLegal)
{
throw new ArgumentException("\"..\" can be only added at the beginning of the pattern.");
}
segment = new ParentPathSegment();
}
}
if (segment == null && endSegment - beginSegment == 1)
{
if (pattern[beginSegment] == '.')
{
// recognized .
segment = new CurrentPathSegment();
}
}
if (segment == null && endSegment - beginSegment > 2)
{
if (pattern[beginSegment] == '*' &&
pattern[beginSegment + 1] == '*' &&
pattern[beginSegment + 2] == '.')
{
// recognize **.
// swallow the first *, add the recursive path segment and
// the remaining part will be treat as wild card in next loop.
segment = new RecursiveWildcardSegment();
endSegment = beginSegment;
}
}
if (segment == null)
{
var beginsWith = string.Empty;
var contains = new List<string>();
var endsWith = string.Empty;
for (int scanSegment = beginSegment; scanSegment < endSegment;)
{
var beginLiteral = scanSegment;
var endLiteral = NextIndex(pattern, _star, scanSegment, endSegment);
if (beginLiteral == beginSegment)
{
if (endLiteral == endSegment)
{
// and the only bit
segment = new LiteralPathSegment(Portion(pattern, beginLiteral, endLiteral));
}
else
{
// this is the first bit
beginsWith = Portion(pattern, beginLiteral, endLiteral);
}
}
else if (endLiteral == endSegment)
{
// this is the last bit
endsWith = Portion(pattern, beginLiteral, endLiteral);
}
else
{
if (beginLiteral != endLiteral)
{
// this is a middle bit
contains.Add(Portion(pattern, beginLiteral, endLiteral));
}
else
{
// note: NOOP here, adjacent *'s are collapsed when they
// are mixed with literal text in a path segment
}
}
scanSegment = endLiteral + 1;
}
if (segment == null)
{
segment = new WildcardPathSegment(beginsWith, contains, endsWith);
}
}
if (!(segment is ParentPathSegment))
{
isParentSegmentLegal = false;
}
if (segment is CurrentPathSegment)
{
// ignore ".\"
}
else
{
if (segment is RecursiveWildcardSegment)
{
if (segmentsPatternStartsWith == null)
{
segmentsPatternStartsWith = new List<IPathSegment>(allSegments);
segmentsPatternEndsWith = new List<IPathSegment>();
segmentsPatternContains = new List<IList<IPathSegment>>();
}
else if (segmentsPatternEndsWith.Count != 0)
{
segmentsPatternContains.Add(segmentsPatternEndsWith);
segmentsPatternEndsWith = new List<IPathSegment>();
}
}
else if (segmentsPatternEndsWith != null)
{
segmentsPatternEndsWith.Add(segment);
}
allSegments.Add(segment);
}
scanPattern = endSegment + 1;
}
if (segmentsPatternStartsWith == null)
{
return new LinearPattern(allSegments);
}
else
{
return new RaggedPattern(allSegments, segmentsPatternStartsWith, segmentsPatternEndsWith, segmentsPatternContains);
}
}
public void Match(string testSample, bool expectation)
{
var pathSegment = new ParentPathSegment();
Assert.Equal(expectation, pathSegment.Match(testSample));
}