Python ast.UAdd方法代码示例

# 需要导入模块: import ast [as 别名]
# 或者: from ast import UAdd [as 别名]
def visit_UnaryOp(self, node):
        self.visit(node.operand)
        op = node.op
        node.obj = node.operand.obj
        if isinstance(op, ast.Not):
            node.obj = bool()
        elif isinstance(op, ast.UAdd):
            node.obj = int(-1)
        elif isinstance(op, ast.USub):
            node.obj = int(-1) 

# 需要导入模块: import ast [as 别名]
# 或者: from ast import UAdd [as 别名]
def factor_rewrite(mark: Tokenizer, factor, power):
    return power if power else ast.UnaryOp(
        **(loc @ mark),
        op={
            '~': ast.Invert,
            '+': ast.UAdd,
            '-': ast.USub
        }[mark.value](),
        operand=factor,
    ) 

# 需要导入模块: import ast [as 别名]
# 或者: from ast import UAdd [as 别名]
def visitUnaryOp(self, node):
        import ast
        if isinstance(node.op, ast.UAdd):
            return +self.visit(node.operand)
        elif isinstance(node.op, ast.USub):
            return -self.visit(node.operand)
        else:
            raise SyntaxError("Unknown unary op: %r" % node.op) 

# 需要导入模块: import ast [as 别名]
# 或者: from ast import UAdd [as 别名]
def visit_UnaryOp(self, node, **kwargs):
        if isinstance(node.op, (ast.Not, ast.Invert)):
            return UnaryOp('~', self.visit(node.operand))
        elif isinstance(node.op, ast.USub):
            return self.const_type(-self.visit(node.operand).value, self.env)
        elif isinstance(node.op, ast.UAdd):
            raise NotImplementedError('Unary addition not supported') 

# 需要导入模块: import ast [as 别名]
# 或者: from ast import UAdd [as 别名]
def visit_UnaryOp(self, node):
        'Change USub and Invert'
        operand = self.visit(node.operand)
        if isinstance(node.op, ast.UAdd):
            return operand
        if isinstance(node.op, ast.USub):
            return ast.BinOp(ast.Num(-1), ast.Mult(), operand)
        if isinstance(node.op, ast.Invert):
            return ast.BinOp(ast.Num(-1), ast.BitXor(), operand)
        assert False, 'unhandled node type: ' + ast.dump(node) 

# 需要导入模块: import ast [as 别名]
# 或者: from ast import UAdd [as 别名]
def visitUnaryOp(self, node):
            import ast
            if isinstance(node.op, ast.UAdd):
                return +self.visit(node.operand)
            elif isinstance(node.op, ast.USub):
                return -self.visit(node.operand)
            else:
                raise SyntaxError("Unknown unary op: %r" % node.op) 

# 需要导入模块: import ast [as 别名]
# 或者: from ast import UAdd [as 别名]
def __init__( s, component ):
    super().__init__( component )
    s.loop_var_env = set()
    s.tmp_var_env = set()

    # opmap maps an ast operator to its RTLIR counterpart.
    s.opmap = {
      # Bool operators
      # Note: we do not support boolean operators because Python does
      # not allow overloading And and Or operators. Using them in
      # expressions might lead to inconsistent semantics.
      # ast.And    : bir.And(),       ast.Or     : bir.Or(),
      # Unary operators
      # Note: ast.Not is disallowed because it is a boolean operator
      # ast.Not    : bir.Not(),
      ast.Invert : bir.Invert(),
      ast.UAdd   : bir.UAdd(),      ast.USub   : bir.USub(),
      # Binary operators
      ast.Add    : bir.Add(),       ast.Sub    : bir.Sub(),
      ast.Mult   : bir.Mult(),      ast.Div    : bir.Div(),
      ast.Mod    : bir.Mod(),       ast.Pow    : bir.Pow(),
      ast.LShift : bir.ShiftLeft(), ast.RShift : bir.ShiftRightLogic(),
      ast.BitOr  : bir.BitOr(),     ast.BitAnd : bir.BitAnd(),
      ast.BitXor : bir.BitXor(),
      # Compare bir.bir.operators
      ast.Eq     : bir.Eq(),        ast.NotEq  : bir.NotEq(),
      ast.Lt     : bir.Lt(),        ast.LtE    : bir.LtE(),
      ast.Gt     : bir.Gt(),        ast.GtE    : bir.GtE()
    }

  # Override 

# 需要导入模块: import ast [as 别名]
# 或者: from ast import UAdd [as 别名]
def visit_UnaryOp(self, node: ast.UnaryOp) -> Any:
        """Visit the node operand and apply the operation on the result."""
        if isinstance(node.op, ast.UAdd):
            result = +self.visit(node=node.operand)
        elif isinstance(node.op, ast.USub):
            result = -self.visit(node=node.operand)
        elif isinstance(node.op, ast.Not):
            result = not self.visit(node=node.operand)
        elif isinstance(node.op, ast.Invert):
            result = ~self.visit(node=node.operand)
        else:
            raise NotImplementedError("Unhandled op of {}: {}".format(node, node.op))

        self.recomputed_values[node] = result
        return result 

# 需要导入模块: import ast [as 别名]
# 或者: from ast import UAdd [as 别名]
def visit_UnaryOp(self, node):
        """
        Adjust operand value and discard unary operations, where possible.

        This is done so that negative decimal literals are accurately represented.
        """
        self.generic_visit(node)

        # TODO once grammar is updated, remove this
        # UAdd has no effect on the value of it's operand, so it is discarded
        if isinstance(node.op, python_ast.UAdd):
            return node.operand

        is_sub = isinstance(node.op, python_ast.USub)
        is_num = (
            hasattr(node.operand, "n")
            and not isinstance(node.operand.n, bool)
            and isinstance(node.operand.n, (int, Decimal))
        )
        if is_sub and is_num:
            node.operand.n = 0 - node.operand.n
            node.operand.col_offset = node.col_offset
            node.operand.node_source_code = node.node_source_code
            return node.operand
        else:
            return node 

# 需要导入模块: import ast [as 别名]
# 或者: from ast import UAdd [as 别名]
def unaryop(self, block, node):
    operand = self.expression(block, node.operand)
    if isinstance(node.op, ast.UAdd):
      #No-Op
      var = operand
    elif isinstance(node.op, ast.USub):
      if operand.value is not None:
        #It's a literal, return the negation
        var = self.add_literal(-operand.value)
      else:
        #It's an expression, subtract from zero (faster than multiplying by -1)
        var = self.add_variable(None)
        zero = self.add_literal(0, 'ZERO')
        operation = BinaryOperation(zero, Operator.subtract, operand)
        assignment = Assignment(var, operation)
        block.add(assignment)
    elif isinstance(node.op, ast.Invert):
      #Make sure it's numeric
      if operand.is_mask:
        raise Exception('Unary invert requires a numeric operand')
      #Bit-flip
      var = self.add_variable(None)
      operation = UnaryOperation(Operator.bit_not, operand)
      assignment = Assignment(var, operation)
      block.add(assignment)
    elif isinstance(node.op, ast.Not):
      #Make sure it's boolean
      if not operand.is_mask:
        raise Exception('Unary not requires a boolean operand')
      #Invert the mask
      var = self.add_variable(None, is_mask=True)
      operation = UnaryOperation(Operator.bool_not, operand)
      assignment = Assignment(var, operation)
      block.add(assignment)
    else:
      raise Exception('Unexpected UnaryOp (%s)'%(node.op.__class__))
    return var

  #Parses a comparison operator (AST CmpOp) 

# 需要导入模块: import ast [as 别名]
# 或者: from ast import UAdd [as 别名]
def is_interesting_expression(node):
    # type: (ast.AST) -> bool
    """
    If this expression has a value that may not be exactly what it looks like,
    return True. Put differently, return False if this is just a literal.
    """
    return (isinstance(node, ast.expr) and
            not (isinstance(node, (ast.Num, ast.Str, getattr(ast, 'NameConstant', ()))) or
                 isinstance(getattr(node, 'ctx', None),
                            (ast.Store, ast.Del)) or
                 (isinstance(node, ast.UnaryOp) and
                  isinstance(node.op, (ast.UAdd, ast.USub)) and
                  isinstance(node.operand, ast.Num)) or
                 (isinstance(node, (ast.List, ast.Tuple, ast.Dict)) and
                  not any(is_interesting_expression(n) for n in ast.iter_child_nodes(node))))) 

# 需要导入模块: import ast [as 别名]
# 或者: from ast import UAdd [as 别名]
def visit_UAdd(self, node):
        trailing_nodes = list(map(type, self.node_window[-4:]))
        if trailing_nodes == [ast.UnaryOp, ast.UAdd, ast.UnaryOp, ast.UAdd]:
            originator = self.node_window[-4]
            self.errors.append(B002(originator.lineno, originator.col_offset))
        self.generic_visit(node) 

# 需要导入模块: import ast [as 别名]
# 或者: from ast import UAdd [as 别名]
def p_factor_1(p):
    '''factor : PLUS factor'''
    #              1      2
    op = ast.UAdd(rule=inspect.currentframe().f_code.co_name, **p[1][1])
    p[0] = ast.UnaryOp(op, p[2], rule=inspect.currentframe().f_code.co_name)
    inherit_lineno(p[0], op)