public static Lexem Consume <TToken>(this TokenWalker walker)
where TToken : IToken
{
var lexem = walker.Pop();
return(lexem.Token switch
{
TToken _ => lexem,
_ => HandleMissingLexem <TToken>(lexem, walker),
});
public static Parser Create()
{
// Create the object tree without DI Framework
var expressionParser = new ExpressionParser();
var factorParser = new FactorParser(expressionParser);
var termParser = new TermParser(factorParser);
expressionParser.TermParser = termParser;
var lexerRules = new LexerRules();
ILinePositionCalculator NewLinePositionCalculator(List <Lexem> lexems) => new LinePositionCalculator(lexems);
ILexerReader NewLexerReader(string expression) => new LexerReader(expression);
var tokenizer = new Tokenizer(lexerRules, NewLexerReader, NewLinePositionCalculator);
IToken NewEpsilonToken() => new EpsilonToken();
var tokenWalker = new TokenWalker(tokenizer, NewEpsilonToken, NewLinePositionCalculator);
return(new Parser(tokenWalker, expressionParser));
}
public IParseNode Parse(TokenWalker walker)
{
return(_expressionParser.Parse(walker));
}
public Parser(TokenWalker tokenWalker, ExpressionParser expressionParser)
{
_tokenWalker = tokenWalker;
_expressionParser = expressionParser;
}