def a_expr(self):
m_expr = self.m_expr()
v = m_expr
while self._peek(self.a_expr_rsts) in self.a_expr_chks:
_token_ = self._peek(self.a_expr_chks)
if _token_ == 'ADD':
ADD = self._scan('ADD')
m_expr = self.m_expr()
v = BinaryOp(operator.add, v, m_expr)
else: # == 'SUB'
SUB = self._scan('SUB')
m_expr = self.m_expr()
v = BinaryOp(operator.sub, v, m_expr)
return v
def m_expr(self):
u_expr = self.u_expr()
v = u_expr
while self._peek(self.m_expr_rsts) in self.m_expr_chks:
_token_ = self._peek(self.m_expr_chks)
if _token_ == 'MUL':
MUL = self._scan('MUL')
u_expr = self.u_expr()
v = BinaryOp(operator.mul, v, u_expr)
else: # == 'DIV'
DIV = self._scan('DIV')
u_expr = self.u_expr()
v = BinaryOp(operator.truediv, v, u_expr)
return v
def comparison(self):
a_expr = self.a_expr()
v = a_expr
while self._peek(self.comparison_rsts) in self.comparison_chks:
_token_ = self._peek(self.comparison_chks)
if _token_ == 'LT':
LT = self._scan('LT')
a_expr = self.a_expr()
v = BinaryOp(operator.lt, v, a_expr)
elif _token_ == 'GT':
GT = self._scan('GT')
a_expr = self.a_expr()
v = BinaryOp(operator.gt, v, a_expr)
elif _token_ == 'LE':
LE = self._scan('LE')
a_expr = self.a_expr()
v = BinaryOp(operator.le, v, a_expr)
elif _token_ == 'GE':
GE = self._scan('GE')
a_expr = self.a_expr()
v = BinaryOp(operator.ge, v, a_expr)
elif _token_ == 'EQ':
EQ = self._scan('EQ')
a_expr = self.a_expr()
v = BinaryOp(operator.eq, v, a_expr)
else: # == 'NE'
NE = self._scan('NE')
a_expr = self.a_expr()
v = BinaryOp(operator.ne, v, a_expr)
return v