public FunctionAST(PrototypeAST proto, IExprAST body)
{
_proto = proto;
_body = body;
}
public BinaryExprAST(char op, IExprAST rhs, IExprAST lhs)
{
_op = op;
_lhs = lhs;
_rhs = rhs;
}
public CallExprAST(string callee, IExprAST[] args)
{
_callee = callee;
_args = args;
}
public static IExprAST ParseBinOpRHS(int exprPrec, IExprAST lhs, Queue<Lexed> tokens)
{
while (true) {
var tokPrec = GetTokPrecedence(tokens.Peek().Token);
if (tokPrec < exprPrec) {
return lhs;
}
var binOp = (char)tokens.Dequeue().Token;
var rhs = ParsePrimary(tokens);
if (rhs == null)
return null;
var nextPrec = GetTokPrecedence(tokens.Peek().Token);
if (tokPrec < nextPrec) {
rhs = ParseBinOpRHS(tokPrec + 1, rhs, tokens);
if (rhs == null)
return null;
}
lhs = new BinaryExprAST(binOp, lhs, rhs);
}
}