332 lines
11 KiB
Python
332 lines
11 KiB
Python
from __future__ import with_statement
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import os
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import pkgutil
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import imp
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import sys
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import time
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import builtin
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import modules
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import debug
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import parsing
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import evaluate
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import itertools
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import settings
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# for debugging purposes only
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imports_processed = 0
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star_import_cache = {}
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class ModuleNotFound(Exception):
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pass
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class ImportPath(parsing.Base):
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"""
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An ImportPath is the path of a `parsing.Import` object.
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"""
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class _GlobalNamespace(object):
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def get_defined_names(self):
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return []
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def get_imports(self):
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return []
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@property
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def start_pos(self):
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return (0, 0)
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def get_parent_until(self):
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return None
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GlobalNamespace = _GlobalNamespace()
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def __init__(self, import_stmt, is_like_search=False, kill_count=0,
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direct_resolve=False):
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self.import_stmt = import_stmt
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self.is_like_search = is_like_search
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self.direct_resolve = direct_resolve
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self.is_partial_import = bool(kill_count)
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path = import_stmt.get_parent_until().path
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self.file_path = os.path.dirname(path) if path is not None else None
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# rest is import_path resolution
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self.import_path = []
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if import_stmt.from_ns:
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self.import_path += import_stmt.from_ns.names
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if import_stmt.namespace:
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if self.is_nested_import() and not direct_resolve:
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self.import_path.append(import_stmt.namespace.names[0])
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else:
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self.import_path += import_stmt.namespace.names
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for i in range(kill_count + int(is_like_search)):
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self.import_path.pop()
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def __repr__(self):
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return '<%s: %s>' % (type(self).__name__, self.import_stmt)
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def is_nested_import(self):
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"""
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This checks for the special case of nested imports, without aliases and
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from statement:
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>>> import foo.bar
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"""
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return not self.import_stmt.alias and not self.import_stmt.from_ns \
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and len(self.import_stmt.namespace.names) > 1 \
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and not self.direct_resolve
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def get_nested_import(self, parent):
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"""
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See documentation of `self.is_nested_import`.
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Generates an Import statement, that can be used to fake nested imports.
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"""
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i = self.import_stmt
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# This is not an existing Import statement. Therefore, set position to
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# 0 (0 is not a valid line number).
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zero = (0, 0)
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n = parsing.Name(i.namespace.names[1:], zero, zero, self.import_stmt)
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new = parsing.Import(zero, zero, n)
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new.parent = parent
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evaluate.faked_scopes.append(new)
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debug.dbg('Generated a nested import: %s' % new)
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return new
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def get_defined_names(self, on_import_stmt=False):
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names = []
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for scope in self.follow():
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if scope is ImportPath.GlobalNamespace:
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if self.import_stmt.relative_count == 0:
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names += self.get_module_names()
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if self.file_path is not None:
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path = os.path.abspath(self.file_path)
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for i in range(self.import_stmt.relative_count - 1):
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path = os.path.dirname(path)
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names += self.get_module_names([path])
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else:
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if on_import_stmt and isinstance(scope, parsing.Module) \
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and scope.path.endswith('__init__.py'):
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pkg_path = os.path.dirname(scope.path)
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names += self.get_module_names([pkg_path])
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for s, scope_names in evaluate.get_names_for_scope(scope,
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include_builtin=False):
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for n in scope_names:
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if self.import_stmt.from_ns is None \
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or self.is_partial_import:
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# from_ns must be defined to access module
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# values plus a partial import means that there
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# is something after the import, which
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# automatically implies that there must not be
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# any non-module scope.
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continue
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names.append(n)
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return names
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def get_module_names(self, search_path=None):
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"""
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Get the names of all modules in the search_path. This means file names
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and not names defined in the files.
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"""
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if not search_path:
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search_path = self.sys_path_with_modifications()
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names = []
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for module_loader, name, is_pkg in pkgutil.iter_modules(search_path):
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inf_pos = (float('inf'), float('inf'))
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names.append(parsing.Name([(name, inf_pos)], inf_pos, inf_pos,
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self.import_stmt))
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return names
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def sys_path_with_modifications(self):
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module = self.import_stmt.get_parent_until()
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return modules.sys_path_with_modifications(module)
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def follow(self, is_goto=False):
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"""
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Returns the imported modules.
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"""
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if evaluate.follow_statement.push_stmt(self.import_stmt):
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# check recursion
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return []
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if self.import_path:
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try:
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scope, rest = self._follow_file_system()
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except ModuleNotFound:
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debug.warning('Module not found: ' + str(self.import_stmt))
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evaluate.follow_statement.pop_stmt()
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return []
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scopes = [scope]
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scopes += itertools.chain.from_iterable(
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remove_star_imports(s) for s in scopes)
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# follow the rest of the import (not FS -> classes, functions)
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if len(rest) > 1 or rest and self.is_like_search:
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scopes = []
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elif rest:
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if is_goto:
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scopes = itertools.chain.from_iterable(
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evaluate.get_scopes_for_name(s, rest[0], is_goto=True)
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for s in scopes)
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else:
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scopes = itertools.chain.from_iterable(
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evaluate.follow_path(iter(rest), s, s)
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for s in scopes)
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scopes = list(scopes)
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if self.is_nested_import():
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scopes.append(self.get_nested_import(scope))
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else:
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scopes = [ImportPath.GlobalNamespace]
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debug.dbg('after import', scopes)
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evaluate.follow_statement.pop_stmt()
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return scopes
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def _follow_file_system(self):
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"""
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Find a module with a path (of the module, like usb.backend.libusb10).
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"""
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def follow_str(ns, string):
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debug.dbg('follow_module', ns, string)
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path = None
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if ns:
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path = ns[1]
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elif self.import_stmt.relative_count:
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module = self.import_stmt.get_parent_until()
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path = os.path.abspath(module.path)
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for i in range(self.import_stmt.relative_count):
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path = os.path.dirname(path)
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global imports_processed
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imports_processed += 1
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if path is not None:
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return imp.find_module(string, [path])
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else:
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debug.dbg('search_module', string, self.file_path)
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# Override the sys.path. It works only good that way.
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# Injecting the path directly into `find_module` did not work.
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sys.path, temp = sys_path_mod, sys.path
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try:
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i = imp.find_module(string)
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except ImportError:
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sys.path = temp
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raise
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sys.path = temp
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return i
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if self.file_path:
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sys_path_mod = list(self.sys_path_with_modifications())
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sys_path_mod.insert(0, self.file_path)
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else:
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sys_path_mod = list(builtin.get_sys_path())
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current_namespace = None
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# now execute those paths
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rest = []
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for i, s in enumerate(self.import_path):
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try:
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current_namespace = follow_str(current_namespace, s)
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except ImportError:
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if current_namespace:
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rest = self.import_path[i:]
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else:
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raise ModuleNotFound(
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'The module you searched has not been found')
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sys_path_mod.pop(0) # TODO why is this here?
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path = current_namespace[1]
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is_package_directory = current_namespace[2][2] == imp.PKG_DIRECTORY
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f = None
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if is_package_directory or current_namespace[0]:
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# is a directory module
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if is_package_directory:
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path += '/__init__.py'
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with open(path) as f:
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source = f.read()
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else:
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source = current_namespace[0].read()
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current_namespace[0].close()
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if path.endswith('.py'):
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f = modules.Module(path, source)
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else:
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f = builtin.Parser(path=path)
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else:
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f = builtin.Parser(name=path)
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return f.parser.module, rest
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def strip_imports(scopes):
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"""
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Here we strip the imports - they don't get resolved necessarily.
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Really used anymore? Merge with remove_star_imports?
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"""
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result = []
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for s in scopes:
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if isinstance(s, parsing.Import):
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result += ImportPath(s).follow()
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else:
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result.append(s)
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return result
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def cache_star_import(func):
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def wrapper(scope, *args, **kwargs):
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try:
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mods = star_import_cache[scope]
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if mods[0] + settings.star_import_cache_validity > time.time():
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return mods[1]
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except KeyError:
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pass
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# cache is too old and therefore invalid or not available
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invalidate_star_import_cache(scope)
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mods = func(scope, *args, **kwargs)
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star_import_cache[scope] = time.time(), mods
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return mods
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return wrapper
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def invalidate_star_import_cache(module, only_main=False):
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""" Important if some new modules are being reparsed """
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try:
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t, mods = star_import_cache[module]
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del star_import_cache[module]
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for m in mods:
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invalidate_star_import_cache(m, only_main=True)
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except KeyError:
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pass
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if not only_main:
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# We need a list here because otherwise the list is being changed
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# during the iteration in py3k: iteritems -> items.
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for key, (t, mods) in list(star_import_cache.items()):
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if module in mods:
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invalidate_star_import_cache(key)
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@cache_star_import
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def remove_star_imports(scope, ignored_modules=[]):
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"""
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Check a module for star imports:
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>>> from module import *
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and follow these modules.
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"""
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modules = strip_imports(i for i in scope.get_imports() if i.star)
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new = []
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for m in modules:
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if m not in ignored_modules:
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new += remove_star_imports(m, modules)
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modules += new
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# Filter duplicate modules.
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return set(modules)
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