/// <summary>
/// Creates a file mapping between a set of source patterns and a target pattern. All patterns should have a matching order and number of wildcards.
/// </summary>
/// <param name="Files">Files to use for the mapping</param>
/// <param name="SourcePatterns">List of source patterns</param>
/// <param name="TargetPattern">Matching output pattern</param>
/// <param name="Filter">Filter to apply to source files</param>
/// <param name="TargetFileToSourceFile">Dictionary to receive a mapping from target file to source file. An exception is thrown if multiple source files map to one target file, or a source file is also used as a target file.</param>
public static Dictionary <FileReference, FileReference> CreateMapping(HashSet <FileReference> Files, ref FilePattern SourcePattern, ref FilePattern TargetPattern)
{
// If the source pattern ends in a directory separator, or a set of input files are specified and it doesn't contain wildcards, treat it as a full directory match
if (SourcePattern.EndsWithDirectorySeparator())
{
SourcePattern = new FilePattern(SourcePattern.BaseDirectory, String.Join("", SourcePattern.Tokens) + "...");
}
else if (Files != null)
{
SourcePattern = SourcePattern.AsDirectoryPattern();
}
// If we have multiple potential source files, but no wildcards in the output pattern, assume it's a directory and append the pattern from the source.
if (SourcePattern.ContainsWildcards() && !TargetPattern.ContainsWildcards())
{
StringBuilder NewPattern = new StringBuilder();
foreach (string Token in TargetPattern.Tokens)
{
NewPattern.Append(Token);
}
if (NewPattern.Length > 0 && NewPattern[NewPattern.Length - 1] != Path.DirectorySeparatorChar)
{
NewPattern.Append(Path.DirectorySeparatorChar);
}
foreach (string Token in SourcePattern.Tokens)
{
NewPattern.Append(Token);
}
TargetPattern = new FilePattern(TargetPattern.BaseDirectory, NewPattern.ToString());
}
// If the target pattern ends with a directory separator, treat it as a full directory match if it has wildcards, or a copy of the source pattern if not
if (TargetPattern.EndsWithDirectorySeparator())
{
TargetPattern = new FilePattern(TargetPattern.BaseDirectory, String.Join("", TargetPattern.Tokens) + "...");
}
// Handle the case where source and target pattern are both individual files
Dictionary <FileReference, FileReference> TargetFileToSourceFile = new Dictionary <FileReference, FileReference>();
if (SourcePattern.ContainsWildcards() || TargetPattern.ContainsWildcards())
{
// Check the two patterns are compatible
if (!SourcePattern.IsCompatibleWith(TargetPattern))
{
throw new FilePatternException("File patterns '{0}' and '{1}' do not have matching wildcards", SourcePattern, TargetPattern);
}
// Create a filter to match the source files
FileFilter Filter = new FileFilter(FileFilterType.Exclude);
Filter.Include(String.Join("", SourcePattern.Tokens));
// Apply it to the source directory
List <FileReference> SourceFiles;
if (Files == null)
{
SourceFiles = Filter.ApplyToDirectory(SourcePattern.BaseDirectory, true);
}
else
{
SourceFiles = CheckInputFiles(Files, SourcePattern.BaseDirectory);
}
// Map them onto output files
FileReference[] TargetFiles = new FileReference[SourceFiles.Count];
// Get the source and target regexes
string SourceRegex = SourcePattern.GetRegexPattern();
string TargetRegex = TargetPattern.GetRegexReplacementPattern();
for (int Idx = 0; Idx < SourceFiles.Count; Idx++)
{
string SourceRelativePath = SourceFiles[Idx].MakeRelativeTo(SourcePattern.BaseDirectory);
string TargetRelativePath = Regex.Replace(SourceRelativePath, SourceRegex, TargetRegex);
TargetFiles[Idx] = FileReference.Combine(TargetPattern.BaseDirectory, TargetRelativePath);
}
// Add them to the output map
for (int Idx = 0; Idx < TargetFiles.Length; Idx++)
{
FileReference ExistingSourceFile;
if (TargetFileToSourceFile.TryGetValue(TargetFiles[Idx], out ExistingSourceFile) && ExistingSourceFile != SourceFiles[Idx])
{
throw new FilePatternException("Output file '{0}' is mapped from '{1}' and '{2}'", TargetFiles[Idx], ExistingSourceFile, SourceFiles[Idx]);
}
TargetFileToSourceFile[TargetFiles[Idx]] = SourceFiles[Idx];
}
}
else
{
// Just copy a single file
FileReference SourceFile = SourcePattern.GetSingleFile();
if (FileReference.Exists(SourceFile))
{
FileReference TargetFile = TargetPattern.GetSingleFile();
TargetFileToSourceFile[TargetFile] = SourceFile;
}
else
{
throw new FilePatternException("Source file '{0}' does not exist", SourceFile);
}
}
// Check that no source file is also destination file
foreach (FileReference SourceFile in TargetFileToSourceFile.Values)
{
if (TargetFileToSourceFile.ContainsKey(SourceFile))
{
throw new FilePatternException("'{0}' is listed as a source and target file", SourceFile);
}
}
// Return the map
return(TargetFileToSourceFile);
}