// this method parses the glob and extracts the fixed directory part in order to normalize it and make it absolute
// without this normalization step, strings pointing outside the globbing cone would still match when they shouldn't
// for example, we dont want "**/*.cs" to match "../Shared/Foo.cs"
// todo: glob rooting partially duplicated with MSBuildGlob.Parse
private static Regex CreateRegex(string unescapedFileSpec, string currentDirectory)
{
Regex regex = null;
string fixedDirPart = null;
string wildcardDirectoryPart = null;
string filenamePart = null;
FileMatcher.SplitFileSpec(
unescapedFileSpec,
out fixedDirPart,
out wildcardDirectoryPart,
out filenamePart,
FileMatcher.s_defaultGetFileSystemEntries);
if (FileUtilities.PathIsInvalid(fixedDirPart))
{
return(null);
}
var absoluteFixedDirPart = Path.Combine(currentDirectory, fixedDirPart);
var normalizedFixedDirPart = string.IsNullOrEmpty(absoluteFixedDirPart)
// currentDirectory is empty for some in-memory projects
? Directory.GetCurrentDirectory()
: FileUtilities.GetFullPathNoThrow(absoluteFixedDirPart);
normalizedFixedDirPart = FileUtilities.EnsureTrailingSlash(normalizedFixedDirPart);
var recombinedFileSpec = string.Join("", normalizedFixedDirPart, wildcardDirectoryPart, filenamePart);
bool isRecursive;
bool isLegal;
FileMatcher.GetFileSpecInfoWithRegexObject(
recombinedFileSpec,
out regex,
out isRecursive,
out isLegal,
FileMatcher.s_defaultGetFileSystemEntries);
return(isLegal ? regex : null);
}
