/// <summary>
/// Validates that a task's outputs are sane. If so, predicts output directories.
/// </summary>
/// <param name="projectFullPath">The absolute path to the project instance. Can be null if the project was not loaded
/// from this</param>
/// <param name="inputs">The inputs specified in SourceFiles on a copy task.</param>
/// <param name="outputs">
/// The outputs specified in the DestinationFolder or DestinationFiles attribute on a copy task.
/// </param>
/// <param name="copyTaskSpecifiesDestinationFolder">True if the user has specified DestinationFolder.</param>
/// <param name="buildOutputDirectories">Collection to fill with output folder predictions.</param>
private static void ProcessOutputs(
string projectFullPath,
FileExpressionList inputs,
FileExpressionList outputs,
bool copyTaskSpecifiesDestinationFolder,
HashSet <string> buildOutputDirectories)
{
for (int i = 0; i < inputs.DedupedFiles.Count; i++)
{
string predictedOutputDirectory;
// If the user specified a destination folder, they could have specified an expression that evaluates to
// either exactly one or N folders. We need to handle each case.
if (copyTaskSpecifiesDestinationFolder)
{
if (outputs.DedupedFiles.Count == 0)
{
// Output files couldn't be parsed, bail out.
break;
}
// If output directories isn't 1 or N, bail out.
if (inputs.DedupedFiles.Count != outputs.DedupedFiles.Count && outputs.DedupedFiles.Count > 1)
{
break;
}
predictedOutputDirectory = outputs.DedupedFiles.Count == 1 ? outputs.DedupedFiles[0] : outputs.DedupedFiles[i];
}
else
{
if (i >= outputs.DedupedFiles.Count)
{
break;
}
// The output list is a set of files. Predict their directories.
predictedOutputDirectory = Path.GetDirectoryName(outputs.DedupedFiles[i]);
}
// If the predicted directory is not absolute, let's try to make it absolute using the project full path
if (!TryMakePathAbsoluteIfNeeded(predictedOutputDirectory, projectFullPath, out string absolutePathPrediction))
{
// The project full path is not available, so just ignore this prediction
continue;
}
buildOutputDirectories.Add(absolutePathPrediction);
}
}
/// <summary>
/// Parses the input and output files for copy tasks of given target.
/// </summary>
private static void ParseCopyTask(
ProjectTargetInstance target,
ProjectInstance projectInstance,
HashSet <BuildInput> buildInputs,
HashSet <string> buildOutputDirectories)
{
// Get all Copy tasks from targets.
List <ProjectTaskInstance> tasks = target.Tasks
.Where(task => string.Equals(task.Name, CopyTaskName, StringComparison.Ordinal))
.ToList();
if (tasks.Any() && projectInstance.EvaluateConditionCarefully(target.Condition))
{
foreach (ProjectTaskInstance task in tasks)
{
if (projectInstance.EvaluateConditionCarefully(task.Condition))
{
var inputs = new FileExpressionList(
task.Parameters[CopyTaskSourceFiles],
projectInstance,
task);
if (inputs.Expressions.Count == 0)
{
continue;
}
buildInputs.UnionWith(inputs.DedupedFiles.
Select(file => new BuildInput(Path.Combine(projectInstance.Directory, file), false)));
bool hasDestinationFolder = task.Parameters.TryGetValue(
CopyTaskDestinationFolder,
out string destinationFolder);
bool hasDestinationFiles = task.Parameters.TryGetValue(
CopyTaskDestinationFiles,
out string destinationFiles);
if (hasDestinationFiles || hasDestinationFolder)
{
// Having both is an MSBuild violation, which it will complain about.
if (hasDestinationFolder && hasDestinationFiles)
{
continue;
}
string destination = destinationFolder ?? destinationFiles;
var outputs = new FileExpressionList(destination, projectInstance, task);
// When using batch tokens, the user should specify exactly one total token, and it must appear in both the input and output.
// Doing otherwise should be a BuildCop error. If not using batch tokens, then any number of other tokens is fine.
if ((outputs.NumBatchExpressions == 1 && outputs.Expressions.Count == 1 &&
inputs.NumBatchExpressions == 1 && inputs.Expressions.Count == 1) ||
(outputs.NumBatchExpressions == 0 && inputs.NumBatchExpressions == 0))
{
ProcessOutputs(projectInstance.FullPath, inputs, outputs, hasDestinationFolder, buildOutputDirectories);
}
else
{
// Ignore case we cannot handle.
}
}
else
{
// Ignore malformed case.
}
}
}
}
}
