public static bool TryParse(string text, out SqlQuery sqlQuery)
{
if (text == null)
{
throw new ArgumentNullException(nameof(text));
}
#if false
AntlrInputStream str = new AntlrInputStream(text);
sqlLexer lexer = new sqlLexer(str);
CommonTokenStream tokens = new CommonTokenStream(lexer);
sqlParser parser = new sqlParser(tokens)
{
ErrorHandler = ThrowExceptionOnErrors.Singleton,
};
ErrorListener <IToken> listener = new ErrorListener <IToken>(parser, lexer, tokens);
parser.AddErrorListener(listener);
sqlParser.ProgramContext programContext;
try
{
programContext = parser.program();
}
catch (Exception)
{
sqlQuery = default;
return(false);
}
if (listener.hadError)
{
sqlQuery = default;
return(false);
}
sqlQuery = (SqlQuery)CstToAstVisitor.Singleton.Visit(programContext);
return(true);
#else
sqlQuery = default;
return(false);
#endif
}
public static TryCatch <SqlQuery> Parse(string text)
{
if (text == null)
{
throw new ArgumentNullException(nameof(text));
}
AntlrInputStream str = new AntlrInputStream(text);
sqlLexer lexer = new sqlLexer(str);
CommonTokenStream tokens = new CommonTokenStream(lexer);
sqlParser parser = new sqlParser(tokens)
{
ErrorHandler = ThrowExceptionOnErrors.Singleton,
};
ErrorListener <IToken> listener = new ErrorListener <IToken>(parser, lexer, tokens);
parser.AddErrorListener(listener);
sqlParser.ProgramContext programContext;
try
{
programContext = parser.program();
}
catch (Exception ex)
{
return(TryCatch <SqlQuery> .FromException(ex));
}
if (listener.parseException != null)
{
return(TryCatch <SqlQuery> .FromException(listener.parseException));
}
SqlQuery sqlQuery = (SqlQuery)CstToAstVisitor.Singleton.Visit(programContext);
return(TryCatch <SqlQuery> .FromResult(sqlQuery));
}