static Expr parsePrecedence(Precedence precedence)
{
Expr expr = null;
parser.advance();
PrefixFn prefixRule = getRule(parser.previous().type).prefix;
if (prefixRule == null)
{
parser.error(parser.previous(), "Expect expression.");
return(null);
}
//bool canAssign = precedence <= Precedence.PREC_ASSIGNMENT;
expr = prefixRule();
while (precedence <= getRule(parser.peek().type).precedence)
{
parser.advance();
InfixFn infixRule = getRule(parser.previous().type).infix;
expr = infixRule(expr);
}
return(expr);
}
public void RegisterPrefix(TokenType tokenType, PrefixFn prefixFn)
{
prefixParseFns.Add(tokenType, prefixFn);
}
public ParseRule(PrefixFn prefix, InfixFn infix, Precedence precedence)
{
this.prefix = prefix; this.infix = infix; this.precedence = precedence;
}
