public override BuildResult <Parser <IN, OUT> > BuildParser(object parserInstance, ParserType parserType,
string rootRule, BuildExtension <IN> extensionBuilder = null)
{
var ruleparser = new RuleParser <IN>();
var builder = new ParserBuilder <EbnfTokenGeneric, GrammarNode <IN> >();
var grammarParser = builder.BuildParser(ruleparser, ParserType.LL_RECURSIVE_DESCENT, "rule").Result;
var result = new BuildResult <Parser <IN, OUT> >();
ParserConfiguration <IN, OUT> configuration = null;
try
{
configuration = ExtractEbnfParserConfiguration(parserInstance.GetType(), grammarParser);
LeftRecursionChecker <IN, OUT> recursionChecker = new LeftRecursionChecker <IN, OUT>();
var(foundRecursion, recursions) = LeftRecursionChecker <IN, OUT> .CheckLeftRecursion(configuration);
if (foundRecursion)
{
var recs = string.Join("\n", recursions.Select(x => string.Join(" > ", x)));
result.AddError(new ParserInitializationError(ErrorLevel.FATAL, $"left recursion detected : {recs}", ErrorCodes.PARSER_LEFT_RECURSIVE));
return(result);
}
configuration.StartingRule = rootRule;
}
catch (Exception e)
{
result.AddError(new ParserInitializationError(ErrorLevel.ERROR, e.Message, ErrorCodes.PARSER_UNKNOWN_ERROR));
return(result);
}
var syntaxParser = BuildSyntaxParser(configuration, parserType, rootRule);
SyntaxTreeVisitor <IN, OUT> visitor = null;
if (parserType == ParserType.LL_RECURSIVE_DESCENT)
{
new SyntaxTreeVisitor <IN, OUT>(configuration, parserInstance);
}
else if (parserType == ParserType.EBNF_LL_RECURSIVE_DESCENT)
{
visitor = new EBNFSyntaxTreeVisitor <IN, OUT>(configuration, parserInstance);
}
var parser = new Parser <IN, OUT>(syntaxParser, visitor);
parser.Configuration = configuration;
var lexerResult = BuildLexer(extensionBuilder);
if (lexerResult.IsError)
{
foreach (var lexerResultError in lexerResult.Errors)
{
result.AddError(lexerResultError);
}
return(result);
}
else
{
parser.Lexer = lexerResult.Result;
}
parser.Instance = parserInstance;
result.Result = parser;
return(result);
}
