private ImmutableArray <EmbeddedText> AcquireEmbeddedTexts(Compilation compilation, IList <Diagnostic> diagnostics)
{
if (Arguments.EmbeddedFiles.IsEmpty)
{
return(ImmutableArray <EmbeddedText> .Empty);
}
var embeddedTreeMap = new Dictionary <string, SyntaxTree>(Arguments.EmbeddedFiles.Length);
var embeddedFileOrderedSet = new OrderedSet <string>(Arguments.EmbeddedFiles.Select(e => e.Path));
foreach (var tree in compilation.SyntaxTrees)
{
// Skip trees that will not have their text embedded.
if (!EmbeddedSourcePaths.Contains(tree.FilePath))
{
continue;
}
// Skip trees with duplicated paths. (VB allows this and "first tree wins" is same as PDB emit policy.)
if (embeddedTreeMap.ContainsKey(tree.FilePath))
{
continue;
}
// map embedded file path to corresponding source tree
embeddedTreeMap.Add(tree.FilePath, tree);
// also embed the text of any #line directive targets of embedded tree
ResolveEmbeddedFilesFromExternalSourceDirectives(tree, compilation.Options.SourceReferenceResolver, embeddedFileOrderedSet, diagnostics);
}
var embeddedTextBuilder = ImmutableArray.CreateBuilder <EmbeddedText>(embeddedFileOrderedSet.Count);
foreach (var path in embeddedFileOrderedSet)
{
SyntaxTree tree;
EmbeddedText text;
if (embeddedTreeMap.TryGetValue(path, out tree))
{
text = EmbeddedText.FromSource(path, tree.GetText());
Debug.Assert(text != null);
}
else
{
text = TryReadEmbeddedFileContent(path, diagnostics);
Debug.Assert(text != null || diagnostics.Any(d => d.Severity == DiagnosticSeverity.Error));
}
// We can safely add nulls because result will be ignored if any error is produced.
// This allows the MoveToImmutable to work below in all cases.
embeddedTextBuilder.Add(text);
}
return(embeddedTextBuilder.MoveToImmutable());
}