fsyacc 是否有某种方法来处理在解析时引入的运算符?我正在尝试为 Kaleidoscope 构建一个解析器,它是一种玩具语言,用作LLVM 教程的示例。Kaleidoscope 允许定义运算符以及优先级。例如:
# Logical unary not.
def unary!(v)
if v then
0
else
1;
# Define > with the same precedence as <.
def binary> 10 (LHS RHS)
RHS < LHS;
# Binary "logical or", (note that it does not "short circuit")
def binary| 5 (LHS RHS)
if LHS then
1
else if RHS then
1
else
0;
# Define = with slightly lower precedence than relationals.
def binary= 9 (LHS RHS)
!(LHS < RHS | LHS > RHS);