public static IEnumerable <Token> GetTokens(SourceFile sourceFile)
{
var regex = Regexes.Instance.CombinedRegex;
var groupNames = Regexes.Instance.TokenGroupNames;
int lastPos = 0;
Exception MakeError(string message)
{
return(new Exception(sourceFile.MakeErrorMessage(lastPos, message)));
}
var text = sourceFile.Text;
for (var m = regex.Match(text); m.Success; m = m.NextMatch())
{
if (lastPos < m.Index)
{
throw MakeError($"Пропустили '{text.Substring(lastPos, m.Index - lastPos)}'");
}
bool found = false;
foreach (var kv in groupNames)
{
if (m.Groups[kv.Item2].Success)
{
if (found)
{
throw new Exception("Кривая регулярка нашла несколько вхождений");
}
found = true;
yield return(new Token(m.Index, kv.Item1, m.Value));
}
}
if (!found)
{
throw new Exception("Кривая регулярка");
}
lastPos = m.Index + m.Length;
}
if (lastPos < text.Length)
{
throw MakeError($"Пропустили '{text.Substring(lastPos)}'");
}
}
Exception MakeError(string message)
{
return(new Exception(sourceFile.MakeErrorMessage(CurrentPosition, message)));
}