public bool CallSubLexer <TSubToken>(SubLexerInvokeInfo <TSubToken> invokeInfo, out Lexeme <TSubToken> result) where TSubToken : unmanaged, Enum
{
var offset = TextPointer;
var textSource = LexemeSource.TextSource.Slice(offset);
var lexer = invokeInfo.Lexer;
var lexemeSource = lexer.GetLexemeSource(textSource);
var enumerator = lexemeSource.GetEnumerator();
result = default;
try
{
if (enumerator.MoveNext() == false)
{
return(false);
}
if (lexer.GetIntValue(result.Token) != lexer.GetIntValue(invokeInfo.Rule.Token))
{
return(false);
}
result = enumerator.Current;
result.StartField += offset;
result.EndField += offset;
LexemeSource.Position = offset + result.End - result.Start;
AdvanceInstructionPosition();
return(true);
}
catch
{
return(false);
}
finally
{
enumerator.Dispose();
lexemeSource.Dispose();
}
}
private Entry CreateSubLexerEntry <TSubToken>(Grammar <TToken> .SubLexerEntry <TSubToken> subLexerEntry) where TSubToken : unmanaged, Enum
{
var subLexerInvokeInfo = new SubLexerInvokeInfo <TSubToken>(subLexerEntry);
return(new ParserPredicateEntry <Lexeme <TSubToken> >(subLexerEntry, c => subLexerInvokeInfo.SubLex(c), ParserPredicateKind.SubLexer));
}
