X-Git-Url: http://iramuteq.org/git?a=blobdiff_plain;f=configparser_helpers.py;fp=configparser_helpers.py;h=470cd5f8ed66b0cb0bef013abb5a105c334f1da2;hb=3f66309538f8393e15449aa1380430457ed864b7;hp=0000000000000000000000000000000000000000;hpb=d890f400e628c5ab51b8cbfdecb1ca94e77bc281;p=iramuteq

diff --git a/configparser_helpers.py b/configparser_helpers.py
new file mode 100644
index 0000000..470cd5f
--- /dev/null
+++ b/configparser_helpers.py
@@ -0,0 +1,134 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from collections import MutableMapping
+try:
+    from thread import get_ident
+except ImportError:
+    try:
+        from _thread import get_ident
+    except ImportError:
+        from _dummy_thread import get_ident
+
+# from reprlib 3.2.1
+def recursive_repr(fillvalue=u'...'):
+    u'Decorator to make a repr function return fillvalue for a recursive call'
+
+    def decorating_function(user_function):
+        repr_running = set()
+
+        def wrapper(self):
+            key = id(self), get_ident()
+            if key in repr_running:
+                return fillvalue
+            repr_running.add(key)
+            try:
+                result = user_function(self)
+            finally:
+                repr_running.discard(key)
+            return result
+
+        # Can't use functools.wraps() here because of bootstrap issues
+        wrapper.__module__ = getattr(user_function, u'__module__')
+        wrapper.__doc__ = getattr(user_function, u'__doc__')
+        wrapper.__name__ = getattr(user_function, u'__name__')
+        wrapper.__annotations__ = getattr(user_function, u'__annotations__', {})
+        return wrapper
+
+    return decorating_function
+
+# from collections 3.2.1
+class _ChainMap(MutableMapping):
+    u''' A ChainMap groups multiple dicts (or other mappings) together
+    to create a single, updateable view.
+
+    The underlying mappings are stored in a list.  That list is public and can
+    accessed or updated using the *maps* attribute.  There is no other state.
+
+    Lookups search the underlying mappings successively until a key is found.
+    In contrast, writes, updates, and deletions only operate on the first
+    mapping.
+
+    '''
+
+    def __init__(self, *maps):
+        u'''Initialize a ChainMap by setting *maps* to the given mappings.
+        If no mappings are provided, a single empty dictionary is used.
+
+        '''
+        self.maps = list(maps) or [{}]          # always at least one map
+
+    def __missing__(self, key):
+        raise KeyError(key)
+
+    def __getitem__(self, key):
+        for mapping in self.maps:
+            try:
+                return mapping[key]             # can't use 'key in mapping' with defaultdict
+            except KeyError:
+                pass
+        return self.__missing__(key)            # support subclasses that define __missing__
+
+    def get(self, key, default=None):
+        return self[key] if key in self else default
+
+    def __len__(self):
+        return len(set().union(*self.maps))     # reuses stored hash values if possible
+
+    def __iter__(self):
+        return iter(set().union(*self.maps))
+
+    def __contains__(self, key):
+        return any(key in m for m in self.maps)
+
+    @recursive_repr()
+    def __repr__(self):
+        return u'{0.__class__.__name__}({1})'.format(
+            self, u', '.join(map(repr, self.maps)))
+
+    @classmethod
+    def fromkeys(cls, iterable, *args):
+        u'Create a ChainMap with a single dict created from the iterable.'
+        return cls(dict.fromkeys(iterable, *args))
+
+    def copy(self):
+        u'New ChainMap or subclass with a new copy of maps[0] and refs to maps[1:]'
+        return self.__class__(self.maps[0].copy(), *self.maps[1:])
+
+    __copy__ = copy
+
+    def new_child(self):                        # like Django's Context.push()
+        u'New ChainMap with a new dict followed by all previous maps.'
+        return self.__class__({}, *self.maps)
+
+    @property
+    def parents(self):                          # like Django's Context.pop()
+        u'New ChainMap from maps[1:].'
+        return self.__class__(*self.maps[1:])
+
+    def __setitem__(self, key, value):
+        self.maps[0][key] = value
+
+    def __delitem__(self, key):
+        try:
+            del self.maps[0][key]
+        except KeyError:
+            raise KeyError(u'Key not found in the first mapping: {!r}'.format(key))
+
+    def popitem(self):
+        u'Remove and return an item pair from maps[0]. Raise KeyError is maps[0] is empty.'
+        try:
+            return self.maps[0].popitem()
+        except KeyError:
+            raise KeyError(u'No keys found in the first mapping.')
+
+    def pop(self, key, *args):
+        u'Remove *key* from maps[0] and return its value. Raise KeyError if *key* not in maps[0].'
+        try:
+            return self.maps[0].pop(key, *args)
+        except KeyError:
+            raise KeyError(u'Key not found in the first mapping: {!r}'.format(key))
+
+    def clear(self):
+        u'Clear maps[0], leaving maps[1:] intact.'
+        self.maps[0].clear()