[content/test/gpu] Run pylint check of gpu tests in unittest instead of PRESUBMIT

third_party/pylint/pylint/checkers/utils.py

Index: third_party/pylint/pylint/checkers/utils.py
diff --git a/third_party/pylint/pylint/checkers/utils.py b/third_party/pylint/pylint/checkers/utils.py
new file mode 100644
index 0000000000000000000000000000000000000000..2cb01d558e07a37d3619da22a8de98946184df40
--- /dev/null
+++ b/third_party/pylint/pylint/checkers/utils.py
@@ -0,0 +1,564 @@
+# pylint: disable=W0611
+#
+# Copyright (c) 2003-2013 LOGILAB S.A. (Paris, FRANCE).
+# http://www.logilab.fr/ -- mailto:contact@logilab.fr
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the License, or (at your option) any later
+# version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+"""some functions that may be useful for various checkers
+"""
+
+import re
+import sys
+import string
+
+import astroid
+from astroid import scoped_nodes
+from logilab.common.compat import builtins
+
+BUILTINS_NAME = builtins.__name__
+COMP_NODE_TYPES = astroid.ListComp, astroid.SetComp, astroid.DictComp, astroid.GenExpr
+PY3K = sys.version_info[0] == 3
+
+if not PY3K:
+    EXCEPTIONS_MODULE = "exceptions"
+else:
+    EXCEPTIONS_MODULE = "builtins"
+ABC_METHODS = set(('abc.abstractproperty', 'abc.abstractmethod',
+                   'abc.abstractclassmethod', 'abc.abstractstaticmethod'))
+
+
+class NoSuchArgumentError(Exception):
+    pass
+
+def is_inside_except(node):
+    """Returns true if node is inside the name of an except handler."""
+    current = node
+    while current and not isinstance(current.parent, astroid.ExceptHandler):
+        current = current.parent
+
+    return current and current is current.parent.name
+
+
+def get_all_elements(node):
+    """Recursively returns all atoms in nested lists and tuples."""
+    if isinstance(node, (astroid.Tuple, astroid.List)):
+        for child in node.elts:
+            for e in get_all_elements(child):
+                yield e
+    else:
+        yield node
+
+
+def clobber_in_except(node):
+    """Checks if an assignment node in an except handler clobbers an existing
+    variable.
+
+    Returns (True, args for W0623) if assignment clobbers an existing variable,
+    (False, None) otherwise.
+    """
+    if isinstance(node, astroid.AssAttr):
+        return (True, (node.attrname, 'object %r' % (node.expr.as_string(),)))
+    elif isinstance(node, astroid.AssName):
+        name = node.name
+        if is_builtin(name):
+            return (True, (name, 'builtins'))
+        else:
+            stmts = node.lookup(name)[1]
+            if (stmts and not isinstance(stmts[0].ass_type(),
+                                         (astroid.Assign, astroid.AugAssign,
+                                          astroid.ExceptHandler))):
+                return (True, (name, 'outer scope (line %s)' % stmts[0].fromlineno))
+    return (False, None)
+
+
+def safe_infer(node):
+    """return the inferred value for the given node.
+    Return None if inference failed or if there is some ambiguity (more than
+    one node has been inferred)
+    """
+    try:
+        inferit = node.infer()
+        value = next(inferit)
+    except astroid.InferenceError:
+        return
+    try:
+        next(inferit)
+        return # None if there is ambiguity on the inferred node
+    except astroid.InferenceError:
+        return # there is some kind of ambiguity
+    except StopIteration:
+        return value
+
+def is_super(node):
+    """return True if the node is referencing the "super" builtin function
+    """
+    if getattr(node, 'name', None) == 'super' and \
+           node.root().name == BUILTINS_NAME:
+        return True
+    return False
+
+def is_error(node):
+    """return true if the function does nothing but raising an exception"""
+    for child_node in node.get_children():
+        if isinstance(child_node, astroid.Raise):
+            return True
+        return False
+
+def is_raising(body):
+    """return true if the given statement node raise an exception"""
+    for node in body:
+        if isinstance(node, astroid.Raise):
+            return True
+    return False
+
+def is_empty(body):
+    """return true if the given node does nothing but 'pass'"""
+    return len(body) == 1 and isinstance(body[0], astroid.Pass)
+
+builtins = builtins.__dict__.copy()
+SPECIAL_BUILTINS = ('__builtins__',) # '__path__', '__file__')
+
+def is_builtin_object(node):
+    """Returns True if the given node is an object from the __builtin__ module."""
+    return node and node.root().name == BUILTINS_NAME
+
+def is_builtin(name): # was is_native_builtin
+    """return true if <name> could be considered as a builtin defined by python
+    """
+    if name in builtins:
+        return True
+    if name in SPECIAL_BUILTINS:
+        return True
+    return False
+
+def is_defined_before(var_node):
+    """return True if the variable node is defined by a parent node (list,
+    set, dict, or generator comprehension, lambda) or in a previous sibling
+    node on the same line (statement_defining ; statement_using)
+    """
+    varname = var_node.name
+    _node = var_node.parent
+    while _node:
+        if isinstance(_node, COMP_NODE_TYPES):
+            for ass_node in _node.nodes_of_class(astroid.AssName):
+                if ass_node.name == varname:
+                    return True
+        elif isinstance(_node, astroid.For):
+            for ass_node in _node.target.nodes_of_class(astroid.AssName):
+                if ass_node.name == varname:
+                    return True
+        elif isinstance(_node, astroid.With):
+            for expr, ids in _node.items:
+                if expr.parent_of(var_node):
+                    break
+                if (ids and
+                        isinstance(ids, astroid.AssName) and
+                        ids.name == varname):
+                    return True
+        elif isinstance(_node, (astroid.Lambda, astroid.Function)):
+            if _node.args.is_argument(varname):
+                return True
+            if getattr(_node, 'name', None) == varname:
+                return True
+            break
+        elif isinstance(_node, astroid.ExceptHandler):
+            if isinstance(_node.name, astroid.AssName):
+                ass_node = _node.name
+                if ass_node.name == varname:
+                    return True
+        _node = _node.parent
+    # possibly multiple statements on the same line using semi colon separator
+    stmt = var_node.statement()
+    _node = stmt.previous_sibling()
+    lineno = stmt.fromlineno
+    while _node and _node.fromlineno == lineno:
+        for ass_node in _node.nodes_of_class(astroid.AssName):
+            if ass_node.name == varname:
+                return True
+        for imp_node in _node.nodes_of_class((astroid.From, astroid.Import)):
+            if varname in [name[1] or name[0] for name in imp_node.names]:
+                return True
+        _node = _node.previous_sibling()
+    return False
+
+def is_func_default(node):
+    """return true if the given Name node is used in function default argument's
+    value
+    """
+    parent = node.scope()
+    if isinstance(parent, astroid.Function):
+        for default_node in parent.args.defaults:
+            for default_name_node in default_node.nodes_of_class(astroid.Name):
+                if default_name_node is node:
+                    return True
+    return False
+
+def is_func_decorator(node):
+    """return true if the name is used in function decorator"""
+    parent = node.parent
+    while parent is not None:
+        if isinstance(parent, astroid.Decorators):
+            return True
+        if (parent.is_statement or
+                isinstance(parent, astroid.Lambda) or
+                isinstance(parent, (scoped_nodes.ComprehensionScope,
+                                    scoped_nodes.ListComp))):
+            break
+        parent = parent.parent
+    return False
+
+def is_ancestor_name(frame, node):
+    """return True if `frame` is a astroid.Class node with `node` in the
+    subtree of its bases attribute
+    """
+    try:
+        bases = frame.bases
+    except AttributeError:
+        return False
+    for base in bases:
+        if node in base.nodes_of_class(astroid.Name):
+            return True
+    return False
+
+def assign_parent(node):
+    """return the higher parent which is not an AssName, Tuple or List node
+    """
+    while node and isinstance(node, (astroid.AssName,
+                                     astroid.Tuple,
+                                     astroid.List)):
+        node = node.parent
+    return node
+
+def overrides_an_abstract_method(class_node, name):
+    """return True if pnode is a parent of node"""
+    for ancestor in class_node.ancestors():
+        if name in ancestor and isinstance(ancestor[name], astroid.Function) and \
+               ancestor[name].is_abstract(pass_is_abstract=False):
+            return True
+    return False
+
+def overrides_a_method(class_node, name):
+    """return True if <name> is a method overridden from an ancestor"""
+    for ancestor in class_node.ancestors():
+        if name in ancestor and isinstance(ancestor[name], astroid.Function):
+            return True
+    return False
+
+PYMETHODS = set(('__new__', '__init__', '__del__', '__hash__',
+                 '__str__', '__repr__',
+                 '__len__', '__iter__',
+                 '__delete__', '__get__', '__set__',
+                 '__getitem__', '__setitem__', '__delitem__', '__contains__',
+                 '__getattribute__', '__getattr__', '__setattr__', '__delattr__',
+                 '__call__',
+                 '__enter__', '__exit__',
+                 '__cmp__', '__ge__', '__gt__', '__le__', '__lt__', '__eq__',
+                 '__nonzero__', '__neg__', '__invert__',
+                 '__mul__', '__imul__', '__rmul__',
+                 '__div__', '__idiv__', '__rdiv__',
+                 '__add__', '__iadd__', '__radd__',
+                 '__sub__', '__isub__', '__rsub__',
+                 '__pow__', '__ipow__', '__rpow__',
+                 '__mod__', '__imod__', '__rmod__',
+                 '__and__', '__iand__', '__rand__',
+                 '__or__', '__ior__', '__ror__',
+                 '__xor__', '__ixor__', '__rxor__',
+                 # XXX To be continued
+                ))
+
+def check_messages(*messages):
+    """decorator to store messages that are handled by a checker method"""
+
+    def store_messages(func):
+        func.checks_msgs = messages
+        return func
+    return store_messages
+
+class IncompleteFormatString(Exception):
+    """A format string ended in the middle of a format specifier."""
+    pass
+
+class UnsupportedFormatCharacter(Exception):
+    """A format character in a format string is not one of the supported
+    format characters."""
+    def __init__(self, index):
+        Exception.__init__(self, index)
+        self.index = index
+
+def parse_format_string(format_string):
+    """Parses a format string, returning a tuple of (keys, num_args), where keys
+    is the set of mapping keys in the format string, and num_args is the number
+    of arguments required by the format string.  Raises
+    IncompleteFormatString or UnsupportedFormatCharacter if a
+    parse error occurs."""
+    keys = set()
+    num_args = 0
+    def next_char(i):
+        i += 1
+        if i == len(format_string):
+            raise IncompleteFormatString
+        return (i, format_string[i])
+    i = 0
+    while i < len(format_string):
+        char = format_string[i]
+        if char == '%':
+            i, char = next_char(i)
+            # Parse the mapping key (optional).
+            key = None
+            if char == '(':
+                depth = 1
+                i, char = next_char(i)
+                key_start = i
+                while depth != 0:
+                    if char == '(':
+                        depth += 1
+                    elif char == ')':
+                        depth -= 1
+                    i, char = next_char(i)
+                key_end = i - 1
+                key = format_string[key_start:key_end]
+
+            # Parse the conversion flags (optional).
+            while char in '#0- +':
+                i, char = next_char(i)
+            # Parse the minimum field width (optional).
+            if char == '*':
+                num_args += 1
+                i, char = next_char(i)
+            else:
+                while char in string.digits:
+                    i, char = next_char(i)
+            # Parse the precision (optional).
+            if char == '.':
+                i, char = next_char(i)
+                if char == '*':
+                    num_args += 1
+                    i, char = next_char(i)
+                else:
+                    while char in string.digits:
+                        i, char = next_char(i)
+            # Parse the length modifier (optional).
+            if char in 'hlL':
+                i, char = next_char(i)
+            # Parse the conversion type (mandatory).
+            if PY3K:
+                flags = 'diouxXeEfFgGcrs%a'
+            else:
+                flags = 'diouxXeEfFgGcrs%'
+            if char not in flags:
+                raise UnsupportedFormatCharacter(i)
+            if key:
+                keys.add(key)
+            elif char != '%':
+                num_args += 1
+        i += 1
+    return keys, num_args
+
+
+def is_attr_protected(attrname):
+    """return True if attribute name is protected (start with _ and some other
+    details), False otherwise.
+    """
+    return attrname[0] == '_' and not attrname == '_' and not (
+        attrname.startswith('__') and attrname.endswith('__'))
+
+def node_frame_class(node):
+    """return klass node for a method node (or a staticmethod or a
+    classmethod), return null otherwise
+    """
+    klass = node.frame()
+
+    while klass is not None and not isinstance(klass, astroid.Class):
+        if klass.parent is None:
+            klass = None
+        else:
+            klass = klass.parent.frame()
+
+    return klass
+
+def is_super_call(expr):
+    """return True if expression node is a function call and if function name
+    is super. Check before that you're in a method.
+    """
+    return (isinstance(expr, astroid.CallFunc) and
+            isinstance(expr.func, astroid.Name) and
+            expr.func.name == 'super')
+
+def is_attr_private(attrname):
+    """Check that attribute name is private (at least two leading underscores,
+    at most one trailing underscore)
+    """
+    regex = re.compile('^_{2,}.*[^_]+_?$')
+    return regex.match(attrname)
+
+def get_argument_from_call(callfunc_node, position=None, keyword=None):
+    """Returns the specified argument from a function call.
+
+    :param callfunc_node: Node representing a function call to check.
+    :param int position: position of the argument.
+    :param str keyword: the keyword of the argument.
+
+    :returns: The node representing the argument, None if the argument is not found.
+    :raises ValueError: if both position and keyword are None.
+    :raises NoSuchArgumentError: if no argument at the provided position or with
+    the provided keyword.
+    """
+    if position is None and keyword is None:
+        raise ValueError('Must specify at least one of: position or keyword.')
+    try:
+        if position is not None and not isinstance(callfunc_node.args[position], astroid.Keyword):
+            return callfunc_node.args[position]
+    except IndexError as error:
+        raise NoSuchArgumentError(error)
+    if keyword:
+        for arg in callfunc_node.args:
+            if isinstance(arg, astroid.Keyword) and arg.arg == keyword:
+                return arg.value
+    raise NoSuchArgumentError
+
+def inherit_from_std_ex(node):
+    """
+    Return true if the given class node is subclass of
+    exceptions.Exception.
+    """
+    if node.name in ('Exception', 'BaseException') \
+            and node.root().name == EXCEPTIONS_MODULE:
+        return True
+    return any(inherit_from_std_ex(parent)
+               for parent in node.ancestors(recurs=False))
+
+def is_import_error(handler):
+    """
+    Check if the given exception handler catches
+    ImportError.
+
+    :param handler: A node, representing an ExceptHandler node.
+    :returns: True if the handler catches ImportError, False otherwise.
+    """
+    names = None
+    if isinstance(handler.type, astroid.Tuple):
+        names = [name for name in handler.type.elts
+                 if isinstance(name, astroid.Name)]
+    elif isinstance(handler.type, astroid.Name):
+        names = [handler.type]
+    else:
+        # Don't try to infer that.
+        return
+    for name in names:
+        try:
+            for infered in name.infer():
+                if (isinstance(infered, astroid.Class) and
+                        inherit_from_std_ex(infered) and
+                        infered.name == 'ImportError'):
+                    return True
+        except astroid.InferenceError:
+            continue
+
+def has_known_bases(klass):
+    """Returns true if all base classes of a class could be inferred."""
+    try:
+        return klass._all_bases_known
+    except AttributeError:
+        pass
+    for base in klass.bases:
+        result = safe_infer(base)
+        # TODO: check for A->B->A->B pattern in class structure too?
+        if (not isinstance(result, astroid.Class) or
+                result is klass or
+                not has_known_bases(result)):
+            klass._all_bases_known = False
+            return False
+    klass._all_bases_known = True
+    return True
+
+def decorated_with_property(node):
+    """ Detect if the given function node is decorated with a property. """
+    if not node.decorators:
+        return False
+    for decorator in node.decorators.nodes:
+        if not isinstance(decorator, astroid.Name):
+            continue
+        try:
+            for infered in decorator.infer():
+                if isinstance(infered, astroid.Class):
+                    if (infered.root().name == BUILTINS_NAME and
+                            infered.name == 'property'):
+                        return True
+                    for ancestor in infered.ancestors():
+                        if (ancestor.name == 'property' and
+                                ancestor.root().name == BUILTINS_NAME):
+                            return True
+        except astroid.InferenceError:
+            pass
+
+
+def decorated_with_abc(func):
+    """Determine if the `func` node is decorated with `abc` decorators."""
+    if func.decorators:
+        for node in func.decorators.nodes:
+            try:
+                infered = next(node.infer())
+            except astroid.InferenceError:
+                continue
+            if infered and infered.qname() in ABC_METHODS:
+                return True
+
+
+def unimplemented_abstract_methods(node, is_abstract_cb=decorated_with_abc):
+    """
+    Get the unimplemented abstract methods for the given *node*.
+
+    A method can be considered abstract if the callback *is_abstract_cb*
+    returns a ``True`` value. The check defaults to verifying that
+    a method is decorated with abstract methods.
+    The function will work only for new-style classes. For old-style
+    classes, it will simply return an empty dictionary.
+    For the rest of them, it will return a dictionary of abstract method
+    names and their inferred objects.
+    """
+    visited = {}
+    try:
+        mro = reversed(node.mro())
+    except NotImplementedError:
+        # Old style class, it will not have a mro.
+        return {}
+    except astroid.ResolveError:
+        # Probably inconsistent hierarchy, don'try
+        # to figure this out here.
+        return {}
+    for ancestor in mro:
+        for obj in ancestor.values():
+            infered = obj
+            if isinstance(obj, astroid.AssName):
+                infered = safe_infer(obj)
+                if not infered:
+                    continue
+                if not isinstance(infered, astroid.Function):
+                    if obj.name in visited:
+                        del visited[obj.name]
+            if isinstance(infered, astroid.Function):
+                # It's critical to use the original name,
+                # since after inferring, an object can be something
+                # else than expected, as in the case of the
+                # following assignment.
+                #
+                # class A:
+                #     def keys(self): pass
+                #     __iter__ = keys
+                abstract = is_abstract_cb(infered)
+                if abstract:
+                    visited[obj.name] = infered
+                elif not abstract and obj.name in visited:
+                    del visited[obj.name]
+    return visited