def parse_term(self):
expr = self.parse_factor()
while self.tokens.peek in ('*', '/', '%'):
op = self.tokens.next()
next_expr = self.parse_factor()
expr = ast.BinOp(op.line, op.value, expr, next_expr)
return expr
def parse_additive(self):
expr = self.parse_term()
while self.tokens.peek in ('+', '-'):
op = self.tokens.next()
next_expr = self.parse_term()
expr = ast.BinOp(op.line, op.value, expr, next_expr)
return expr
def parse_relational(self):
expr = self.parse_additive()
while self.tokens.peek in ('<', '>', '<=', '>='):
op = self.tokens.next()
next_expr = self.parse_additive()
expr = ast.BinOp(op.line, op.value, expr, next_expr)
return expr
def parse_equality(self):
expr = self.parse_relational()
while self.tokens.peek in ('==', '!='):
op = self.tokens.next()
next_expr = self.parse_relational()
expr = ast.BinOp(op.line, op.value, expr, next_expr)
return expr
def parse_and(self):
expr = self.parse_not()
while self.tokens.peek == 'and':
line = self.tokens.next().line
next_expr = self.parse_not()
expr = ast.BinOp(line, 'and', expr, next_expr)
return expr
def parse_expression(self):
"""
Parses an expression.
"""
expr = self.parse_and()
while self.tokens.peek == 'or':
line = self.tokens.next().line
next_expr = self.parse_and()
expr = ast.BinOp(line, 'or', expr, next_expr)
return expr