public static IEnumerable<string> ParseConditionalCompilationSymbols(string value, out IEnumerable<Diagnostic> diagnostics)
{
Diagnostic myDiagnostic = null;
value = value.TrimEnd(null);
// Allow a trailing semicolon or comma in the options
if (!value.IsEmpty() &&
(value.Last() == ';' || value.Last() == ','))
{
value = value.Substring(0, value.Length - 1);
}
string[] values = value.Split(new char[] { ';', ',' } /*, StringSplitOptions.RemoveEmptyEntries*/);
var defines = new ArrayBuilder<string>(values.Length);
foreach (string id in values)
{
string trimmedId = id.Trim();
if (SyntaxFacts.IsValidIdentifier(trimmedId))
{
defines.Add(trimmedId);
}
else if (myDiagnostic == null)
{
myDiagnostic = Diagnostic.Create(CSharp.MessageProvider.Instance, (int)ErrorCode.WRN_DefineIdentifierRequired, trimmedId);
}
}
diagnostics = myDiagnostic == null ? SpecializedCollections.EmptyEnumerable<Diagnostic>()
: SpecializedCollections.SingletonEnumerable(myDiagnostic);
return defines.AsEnumerable();
}
