/// <summary>
/// When overridden in a derived class, executes the task.
/// </summary>
/// <returns>
/// true if the task successfully executed; otherwise, false.
/// </returns>
public override bool Execute()
{
try {
Log.LogMessage(MessageImportance.High, "WCC > DefinedSymbols: {0}", string.Join(",", DefinedSymbols));
var preprocessor = new XamlPreprocessor(DefinedSymbols, RemoveIgnorableContent);
var generatedFiles = new List <ITaskItem>();
NewEmbeddedXamlResources = ProcessFiles(EmbeddedXamlResources, generatedFiles, preprocessor).ToArray();
GeneratedFiles = generatedFiles.ToArray();
return(true);
}
catch (Exception e) {
Log.LogErrorFromException(e);
return(false);
}
}
private ITaskItem ProcessFile(ITaskItem file, XamlPreprocessor preprocessor)
{
var sourcePath = file.GetMetadata("FullPath");
// properly resolve linked xaml
var targetRelativePath = file.GetMetadata("Link");
if (string.IsNullOrEmpty(targetRelativePath))
{
targetRelativePath = file.ItemSpec;
}
// if targetRelativePath is still absolute, use file name
if (Path.IsPathRooted(targetRelativePath))
{
targetRelativePath = Path.GetFileName(targetRelativePath);
}
var targetPath = Path.Combine(OutputPath, targetRelativePath);
TaskItem result = null;
// process XAML
Log.LogMessage(MessageImportance.High, "WCC > Preprocessing {0}", targetRelativePath);
var start = DateTime.Now;
if (preprocessor.ProcessXamlFile(sourcePath, targetPath))
{
// targetPath has been written, create linked item
result = new TaskItem(targetPath);
file.CopyMetadataTo(result);
result.SetMetadata("Link", targetRelativePath); // this is the trick that makes it all work (replace page with a page link pointing to \obj\debug\preprocessedxaml\*)
}
var duration = (DateTime.Now - start).TotalMilliseconds;
Log.LogMessage(MessageImportance.Normal, "WCC > Preprocess completed in {0}ms, {1} has {2}changed", duration, targetRelativePath, result == null ? "not " : "");
return(result);
}
private IEnumerable <ITaskItem> ProcessFiles(ITaskItem[] files, List <ITaskItem> generatedFiles, XamlPreprocessor preprocessor)
{
foreach (var file in files)
{
var newFile = ProcessFile(file, preprocessor);
if (newFile != null)
{
generatedFiles.Add(newFile);
yield return(newFile);
}
else
{
yield return(file); // return file as-is
}
}
}