private IEnumerable <Token> HandleInclude(IList <Token> arguments)
{
if (arguments.Count == 0 || arguments[0].Type != TokenType.StringLiteral)
{
// TODO
throw new NotImplementedException("Expected a string literal!");
}
var includeFileName = arguments[0].Value;
includeFileName = includeFileName.Substring(1, includeFileName.Length - 2);
// Search include paths
foreach (var includePath in state.IncludePaths.Prepend(root))
{
var filePath = Path.GetFullPath(Path.Combine(includePath, includeFileName));
if (!File.Exists(filePath))
{
continue;
}
// We found the file to include
// Check if it's pragma onced
if (state.PragmaOncedFiles.Contains(filePath))
{
// Yes, let's skip it
return(Enumerable.Empty <Token>());
}
// Create a sub-processor at the new root
var sourceText = new StreamReader(filePath).AsCharEnumerable();
var tokensToPreProcess = Lexer.Lex(CppTextReader.Process(sourceText));
var pp = new PreProcessor(filePath, state);
return(pp.Process(tokensToPreProcess).SkipLast(1));
}
// TODO
throw new NotImplementedException($"Can't find include '{includeFileName}'!");
}
/// <summary>
/// Processes the given source.
/// </summary>
/// <param name="source">The source characters to process.</param>
/// <returns>The processed characters that have no trigraphs or line-continuations.</returns>
public static IEnumerable <PositionedChar> Process(IEnumerable <char> source)
{
var reader = new CppTextReader(source);
while (reader.MoveNext())
{
yield return(reader.Current);
}
}