text: # Licensed under the Apache License, Version 2.0 (the "License"); you may
  # not use this file except in compliance with the License. You may obtain
  # a copy of the License at
  #
  #      http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  # License for the specific language governing permissions and limitations
  # under the License.
  
  """Mistral's pep8 extensions.
  
  In order to make the review process faster and easier for core devs we are
  adding some Mistral specific pep8 checks. This will catch common errors.
  
  There are two types of pep8 extensions. One is a function that takes either
  a physical or logical line. The physical or logical line is the first param
  in the function definition and can be followed by other parameters supported
  by pep8. The second type is a class that parses AST trees. For more info
  please see pep8.py.
  """
  
  import ast
  import re
  
  from hacking import core
  
  oslo_namespace_imports_dot = re.compile(r"import[\s]+oslo[.][^\s]+")
  oslo_namespace_imports_from_dot = re.compile(r"from[\s]+oslo[.]")
  oslo_namespace_imports_from_root = re.compile(r"from[\s]+oslo[\s]+import[\s]+")
  
  
  @core.flake8ext
  def no_assert_equal_true_false(logical_line):
      """Check for assertTrue/assertFalse sentences
  
      M319
      """
      _start_re = re.compile(r'assert(Not)?Equal\((True|False),')
      _end_re = re.compile(r'assert(Not)?Equal\(.*,\s+(True|False)\)$')
  
      if _start_re.search(logical_line) or _end_re.search(logical_line):
          yield (0, "M319: assertEqual(A, True|False), "
                 "assertEqual(True|False, A), assertNotEqual(A, True|False), "
                 "or assertEqual(True|False, A) sentences must not be used. "
                 "Use assertTrue(A) or assertFalse(A) instead")
  
  
  @core.flake8ext
  def no_assert_true_false_is_not(logical_line):
      """Check for assertIs/assertIsNot sentences
  
      M320
      """
      _re = re.compile(r'assert(True|False)\(.+\s+is\s+(not\s+)?.+\)$')
  
      if _re.search(logical_line):
          yield (0, "M320: assertTrue(A is|is not B) or "
                 "assertFalse(A is|is not B) sentences must not be used. "
                 "Use assertIs(A, B) or assertIsNot(A, B) instead")
  
  
  @core.flake8ext
  def check_oslo_namespace_imports(logical_line):
      if re.match(oslo_namespace_imports_from_dot, logical_line):
          msg = ("O323: '%s' must be used instead of '%s'.") % (
              logical_line.replace('oslo.', 'oslo_'),
              logical_line)
          yield(0, msg)
      elif re.match(oslo_namespace_imports_from_root, logical_line):
          msg = ("O323: '%s' must be used instead of '%s'.") % (
              logical_line.replace('from oslo import ', 'import oslo_'),
              logical_line)
          yield(0, msg)
      elif re.match(oslo_namespace_imports_dot, logical_line):
          msg = ("O323: '%s' must be used instead of '%s'.") % (
              logical_line.replace('import', 'from').replace('.', ' import '),
              logical_line)
          yield(0, msg)
  
  
  @core.flake8ext
  def check_python3_xrange(logical_line):
      if re.search(r"\bxrange\s*\(", logical_line):
          yield(0, "M327: Do not use xrange(). 'xrange()' is not compatible "
                "with Python 3. Use range() or range() instead.")
  
  
  @core.flake8ext
  def check_python3_no_iteritems(logical_line):
      msg = ("M328: Use six.iteritems() instead of dict.iteritems().")
  
      if re.search(r".*\.iteritems\(\)", logical_line):
          yield(0, msg)
  
  
  @core.flake8ext
  def check_python3_no_iterkeys(logical_line):
      msg = ("M329: Use six.iterkeys() instead of dict.iterkeys().")
  
      if re.search(r".*\.iterkeys\(\)", logical_line):
          yield(0, msg)
  
  
  @core.flake8ext
  def check_python3_no_itervalues(logical_line):
      msg = ("M330: Use six.itervalues() instead of dict.itervalues().")
  
      if re.search(r".*\.itervalues\(\)", logical_line):
          yield(0, msg)
  
  
  class BaseASTChecker(ast.NodeVisitor):
      """Provides a simple framework for writing AST-based checks.
  
      Subclasses should implement visit_* methods like any other AST visitor
      implementation. When they detect an error for a particular node the
      method should call ``self.add_error(offending_node)``. Details about
      where in the code the error occurred will be pulled from the node
      object.
  
      Subclasses should also provide a class variable named CHECK_DESC to
      be used for the human readable error message.
  
      """
  
      def __init__(self, tree, filename):
          """This object is created automatically by pep8.
  
          :param tree: an AST tree
          :param filename: name of the file being analyzed
                           (ignored by our checks)
          """
          self._tree = tree
          self._errors = []
  
      def run(self):
          """Called automatically by pep8."""
          self.visit(self._tree)
  
          return self._errors
  
      def add_error(self, node, message=None):
          """Add an error caused by a node to the list of errors for pep8."""
          message = message or self.CHECK_DESC
          error = (node.lineno, node.col_offset, message, self.__class__)
  
          self._errors.append(error)
  
  
  class CheckForLoggingIssues(BaseASTChecker):
  
      name = "check_for_logging_issues"
      version = "1.0"
      CHECK_DESC = ('M001 Using the deprecated Logger.warn')
      LOG_MODULES = ('logging', 'oslo_log.log')
  
      def __init__(self, tree, filename):
          super(CheckForLoggingIssues, self).__init__(tree, filename)
  
          self.logger_names = []
          self.logger_module_names = []
  
          # NOTE(dstanek): This kinda accounts for scopes when talking
          # about only leaf node in the graph.
          self.assignments = {}
  
      def _filter_imports(self, module_name, alias):
          """Keeps lists of logging imports."""
          if module_name in self.LOG_MODULES:
              self.logger_module_names.append(alias.asname or alias.name)
  
      def visit_Import(self, node):
          for alias in node.names:
              self._filter_imports(alias.name, alias)
  
          return super(CheckForLoggingIssues, self).generic_visit(node)
  
      def visit_ImportFrom(self, node):
          for alias in node.names:
              full_name = '%s.%s' % (node.module, alias.name)
              self._filter_imports(full_name, alias)
  
          return super(CheckForLoggingIssues, self).generic_visit(node)
  
      def _find_name(self, node):
          """Return the fully qualified name or a Name or a Attribute."""
          if isinstance(node, ast.Name):
              return node.id
          elif (isinstance(node, ast.Attribute)
                  and isinstance(node.value, (ast.Name, ast.Attribute))):
  
              obj_name = self._find_name(node.value)
  
              if obj_name is None:
                  return None
  
              method_name = node.attr
  
              return obj_name + '.' + method_name
          elif isinstance(node, str):
              return node
          else:  # Could be Subscript, Call or many more
              return None
  
      def visit_Assign(self, node):
          """Look for 'LOG = logging.getLogger'
  
          This handles the simple case:
            name = [logging_module].getLogger(...)
  
          """
          attr_node_types = (ast.Name, ast.Attribute)
  
          if (len(node.targets) != 1
                  or not isinstance(node.targets[0], attr_node_types)):
              # Say no to: "x, y = ..."
              return super(CheckForLoggingIssues, self).generic_visit(node)
  
          target_name = self._find_name(node.targets[0])
  
          if (isinstance(node.value, ast.BinOp) and
                  isinstance(node.value.op, ast.Mod)):
              if (isinstance(node.value.left, ast.Call) and
                      isinstance(node.value.left.func, ast.Name)):
  
                  # NOTE(dstanek): This is done to match cases like:
                  # `msg = _('something %s') % x`
                  node = ast.Assign(value=node.value.left)
  
          if not isinstance(node.value, ast.Call):
  
              # node.value must be a call to getLogger
              self.assignments.pop(target_name, None)
  
              return super(CheckForLoggingIssues, self).generic_visit(node)
  
          if (not isinstance(node.value.func, ast.Attribute)
                  or not isinstance(node.value.func.value, attr_node_types)):
  
              # Function must be an attribute on an object like
              # logging.getLogger
              return super(CheckForLoggingIssues, self).generic_visit(node)
  
          object_name = self._find_name(node.value.func.value)
          func_name = node.value.func.attr
  
          if (object_name in self.logger_module_names
                  and func_name == 'getLogger'):
              self.logger_names.append(target_name)
  
          return super(CheckForLoggingIssues, self).generic_visit(node)
  
      def visit_Call(self, node):
          """Look for the 'LOG.*' calls."""
          # obj.method
          if isinstance(node.func, ast.Attribute):
              obj_name = self._find_name(node.func.value)
  
              if isinstance(node.func.value, ast.Name):
                  method_name = node.func.attr
              elif isinstance(node.func.value, ast.Attribute):
                  obj_name = self._find_name(node.func.value)
                  method_name = node.func.attr
              else:  # Could be Subscript, Call or many more
                  return super(CheckForLoggingIssues, self).generic_visit(node)
  
              # If dealing with a logger the method can't be "warn".
              if obj_name in self.logger_names and method_name == 'warn':
                  self.add_error(node.args[0])
  
          return super(CheckForLoggingIssues, self).generic_visit(node)
  