pylint: upgrade to 1.3.1

third_party/logilab/astroid/inspector.py

+# copyright 2003-2013 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
+#
+# This file is part of astroid.
+#
+# astroid is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by the
+# Free Software Foundation, either version 2.1 of the License, or (at your
+# option) any later version.
+#
+# astroid is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+# for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with astroid. If not, see <http://www.gnu.org/licenses/>.
+"""visitor doing some postprocessing on the astroid tree.
+Try to resolve definitions (namespace) dictionary, relationship...
+
+This module has been imported from pyreverse
+"""
+
+__docformat__ = "restructuredtext en"
+
+from os.path import dirname
+
+import astroid
+from astroid.exceptions import InferenceError
+from astroid.utils import LocalsVisitor
+from astroid.modutils import get_module_part, is_relative, is_standard_module
+
+class IdGeneratorMixIn(object):
+    """
+    Mixin adding the ability to generate integer uid
+    """
+    def __init__(self, start_value=0):
+        self.id_count = start_value
+
+    def init_counter(self, start_value=0):
+        """init the id counter
+        """
+        self.id_count = start_value
+
+    def generate_id(self):
+        """generate a new identifier
+        """
+        self.id_count += 1
+        return self.id_count
+
+
+class Linker(IdGeneratorMixIn, LocalsVisitor):
+    """
+    walk on the project tree and resolve relationships.
+
+    According to options the following attributes may be added to visited nodes:
+
+    * uid,
+      a unique identifier for the node (on astroid.Project, astroid.Module,
+      astroid.Class and astroid.locals_type). Only if the linker has been instantiated
+      with tag=True parameter (False by default).
+
+    * Function
+      a mapping from locals names to their bounded value, which may be a
+      constant like a string or an integer, or an astroid node (on astroid.Module,
+      astroid.Class and astroid.Function).
+
+    * instance_attrs_type
+      as locals_type but for klass member attributes (only on astroid.Class)
+
+    * implements,
+      list of implemented interface _objects_ (only on astroid.Class nodes)
+    """
+
+    def __init__(self, project, inherited_interfaces=0, tag=False):
+        IdGeneratorMixIn.__init__(self)
+        LocalsVisitor.__init__(self)
+        # take inherited interface in consideration or not
+        self.inherited_interfaces = inherited_interfaces
+        # tag nodes or not
+        self.tag = tag
+        # visited project
+        self.project = project
+
+
+    def visit_project(self, node):
+        """visit an astroid.Project node
+
+         * optionally tag the node with a unique id
+        """
+        if self.tag:
+            node.uid = self.generate_id()
+        for module in node.modules:
+            self.visit(module)
+
+    def visit_package(self, node):
+        """visit an astroid.Package node
+
+         * optionally tag the node with a unique id
+        """
+        if self.tag:
+            node.uid = self.generate_id()
+        for subelmt in node.values():
+            self.visit(subelmt)
+
+    def visit_module(self, node):
+        """visit an astroid.Module node
+
+         * set the locals_type mapping
+         * set the depends mapping
+         * optionally tag the node with a unique id
+        """
+        if hasattr(node, 'locals_type'):
+            return
+        node.locals_type = {}
+        node.depends = []
+        if self.tag:
+            node.uid = self.generate_id()
+
+    def visit_class(self, node):
+        """visit an astroid.Class node
+
+         * set the locals_type and instance_attrs_type mappings
+         * set the implements list and build it
+         * optionally tag the node with a unique id
+        """
+        if hasattr(node, 'locals_type'):
+            return
+        node.locals_type = {}
+        if self.tag:
+            node.uid = self.generate_id()
+        # resolve ancestors
+        for baseobj in node.ancestors(recurs=False):
+            specializations = getattr(baseobj, 'specializations', [])
+            specializations.append(node)
+            baseobj.specializations = specializations
+        # resolve instance attributes
+        node.instance_attrs_type = {}
+        for assattrs in node.instance_attrs.values():
+            for assattr in assattrs:
+                self.handle_assattr_type(assattr, node)
+        # resolve implemented interface
+        try:
+            node.implements = list(node.interfaces(self.inherited_interfaces))
+        except InferenceError:
+            node.implements = ()
+
+    def visit_function(self, node):
+        """visit an astroid.Function node
+
+         * set the locals_type mapping
+         * optionally tag the node with a unique id
+        """
+        if hasattr(node, 'locals_type'):
+            return
+        node.locals_type = {}
+        if self.tag:
+            node.uid = self.generate_id()
+
+    link_project = visit_project
+    link_module = visit_module
+    link_class = visit_class
+    link_function = visit_function
+
+    def visit_assname(self, node):
+        """visit an astroid.AssName node
+
+        handle locals_type
+        """
+        # avoid double parsing done by different Linkers.visit
+        # running over the same project:
+        if hasattr(node, '_handled'):
+            return
+        node._handled = True
+        if node.name in node.frame():
+            frame = node.frame()
+        else:
+            # the name has been defined as 'global' in the frame and belongs
+            # there. Btw the frame is not yet visited as the name is in the
+            # root locals; the frame hence has no locals_type attribute
+            frame = node.root()
+        try:
+            values = node.infered()
+            try:
+                already_infered = frame.locals_type[node.name]
+                for valnode in values:
+                    if not valnode in already_infered:
+                        already_infered.append(valnode)
+            except KeyError:
+                frame.locals_type[node.name] = values
+        except astroid.InferenceError:
+            pass
+
+    def handle_assattr_type(self, node, parent):
+        """handle an astroid.AssAttr node
+
+        handle instance_attrs_type
+        """
+        try:
+            values = list(node.infer())
+            try:
+                already_infered = parent.instance_attrs_type[node.attrname]
+                for valnode in values:
+                    if not valnode in already_infered:
+                        already_infered.append(valnode)
+            except KeyError:
+                parent.instance_attrs_type[node.attrname] = values
+        except astroid.InferenceError:
+            pass
+
+    def visit_import(self, node):
+        """visit an astroid.Import node
+
+        resolve module dependencies
+        """
+        context_file = node.root().file
+        for name in node.names:
+            relative = is_relative(name[0], context_file)
+            self._imported_module(node, name[0], relative)
+
+
+    def visit_from(self, node):
+        """visit an astroid.From node
+
+        resolve module dependencies
+        """
+        basename = node.modname
+        context_file = node.root().file
+        if context_file is not None:
+            relative = is_relative(basename, context_file)
+        else:
+            relative = False
+        for name in node.names:
+            if name[0] == '*':
+                continue
+            # analyze dependencies
+            fullname = '%s.%s' % (basename, name[0])
+            if fullname.find('.') > -1:
+                try:
+                    # XXX: don't use get_module_part, missing package precedence
+                    fullname = get_module_part(fullname, context_file)
+                except ImportError:
+                    continue
+            if fullname != basename:
+                self._imported_module(node, fullname, relative)
+
+
+    def compute_module(self, context_name, mod_path):
+        """return true if the module should be added to dependencies"""
+        package_dir = dirname(self.project.path)
+        if context_name == mod_path:
+            return 0
+        elif is_standard_module(mod_path, (package_dir,)):
+            return 1
+        return 0
+
+    # protected methods ########################################################
+
+    def _imported_module(self, node, mod_path, relative):
+        """notify an imported module, used to analyze dependencies
+        """
+        module = node.root()
+        context_name = module.name
+        if relative:
+            mod_path = '%s.%s' % ('.'.join(context_name.split('.')[:-1]),
+                                  mod_path)
+        if self.compute_module(context_name, mod_path):
+            # handle dependencies
+            if not hasattr(module, 'depends'):
+                module.depends = []
+            mod_paths = module.depends
+            if not mod_path in mod_paths:
+                mod_paths.append(mod_path)