From ba82c57193279a21a6ff396e72f8c9e0e50867ab Mon Sep 17 00:00:00 2001
From: Christof Schulze <christof.schulze@fau.de>
Date: Mon, 27 Jan 2020 20:56:31 +0100
Subject: [PATCH] added missing functions for CLI and Environment parsing

---
 collections.py                           | 54 +++++++++++++++++++++++-
 parsing/__init__.py                      | 16 ++++++-
 singleton.py                             | 15 +++++++
 tests/test_parsing/test_humanize_time.py | 11 +++++
 4 files changed, 93 insertions(+), 3 deletions(-)
 create mode 100644 tests/test_parsing/test_humanize_time.py

diff --git a/collections.py b/collections.py
index 091a1d4..c3b676d 100644
--- a/collections.py
+++ b/collections.py
@@ -16,7 +16,8 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with Ammsml.  If not, see <http://www.gnu.org/licenses/>.
 
-from collections.abc import Sequence
+
+from collections.abc import Sequence, Mapping, Hashable
 
 
 def is_string(seq):
@@ -55,11 +56,14 @@ def count(seq):
 
     Resembles the `collections.Counter` class functionality, which is deprecated
     since version 3.3, will be removed in version 3.9
-    It is meant to be replaced when the we find something equivalent in maybe collections.abc
+    It is meant to be replaced when we find something equivalent in maybe collections.abc
 
     this code also runs on Python 2.6.* where collections.Counter is not available.
 
+    :param seq:
+    :return:
     """
+
     if not is_iterable(seq):
         raise Exception('Argument provided  is not an iterable')
 
@@ -69,3 +73,49 @@ def count(seq):
     for elem in seq:
         counters[elem] = counters.get(elem, 0) + 1
     return counters
+
+
+class ImmutableDict(Hashable, Mapping):
+    """
+    Dictionary that cannot be updated
+    """
+    def __init__(self, *args, **kwargs):
+        self._store = dict(*args, **kwargs)
+
+    def __getitem__(self, key):
+        return self._store[key]
+
+    def __iter__(self):
+        return self._store.__iter__()
+
+    def __len__(self):
+        return self._store.__len__()
+
+    def __hash__(self):
+        return hash(frozenset(self.items()))
+
+    def __repr__(self):
+        return 'ImmutableDict({0})'.format(repr(self._store))
+
+    def union(self, overriding_mapping):
+        """
+        Create an ImmutableDict as a combination of the original and overriding_mapping
+
+        :param overriding_mapping: A Mapping of replacement and additional items
+        :return: A copy of the ImmutableDict with key-value pairs from the overriding_mapping added
+
+        If any of the keys in overriding_mapping are already present in the original ImmutableDict,
+        the overriding_mapping item replaces the one in the original ImmutableDict.
+        """
+        return ImmutableDict(self._store, **overriding_mapping)
+
+    def difference(self, subtractive_iterable):
+        """
+        Create an ImmutableDict as a combination of the original minus keys in subtractive_iterable
+
+        :param subtractive_iterable: Any iterable containing keys that should not be present in the new ImmutableDict
+        :return: A copy of the ImmutableDict with keys from the subtractive_iterable removed
+        """
+        remove_keys = frozenset(subtractive_iterable)
+        keys = (k for k in self._store.keys() if k not in remove_keys)
+        return ImmutableDict((k, self._store[k]) for k in keys)
diff --git a/parsing/__init__.py b/parsing/__init__.py
index cdfd95f..1a1e5df 100644
--- a/parsing/__init__.py
+++ b/parsing/__init__.py
@@ -79,6 +79,20 @@ def is_quoted(data):
     return len(data) > 1 and data[0] == data[-1] and data[0] in ('"', "'") and data[-2] != '\\'
 
 
-
+def humanize_time(d) -> str:
+    """
+    Return a human-friendly description of elapsed time
+    :param d:
+    :return:
+    """
+    human = ""
+    if d >= 3600:
+        human += "%dh" % (int(d) // 3600)
+        d %= 3600
+    if d >= 60:
+        human += "%dm" % (int(d) // 60)
+        d %= 60
+    human += ("%.3fs" % d)
+    return human
 
 
diff --git a/singleton.py b/singleton.py
index ce9f97f..bb4b69e 100644
--- a/singleton.py
+++ b/singleton.py
@@ -57,3 +57,18 @@ def with_metaclass(meta, *bases):
         def __prepare__(cls, name, this_bases):
             return meta.__prepare__(name, bases)
     return type.__new__(metaclass, 'temporary_class', (), {})
+
+def add_metaclass(metaclass):
+    """Class decorator for creating a class with a metaclass."""
+    def wrapper(cls):
+        orig_vars = cls.__dict__.copy()
+        slots = orig_vars.get('__slots__')
+        if slots is not None:
+            if isinstance(slots, str):
+                slots = [slots]
+            for slots_var in slots:
+                orig_vars.pop(slots_var)
+        orig_vars.pop('__dict__', None)
+        orig_vars.pop('__weakref__', None)
+        return metaclass(cls.__name__, cls.__bases__, orig_vars)
+    return wrapper
\ No newline at end of file
diff --git a/tests/test_parsing/test_humanize_time.py b/tests/test_parsing/test_humanize_time.py
new file mode 100644
index 0000000..4b9cbea
--- /dev/null
+++ b/tests/test_parsing/test_humanize_time.py
@@ -0,0 +1,11 @@
+import unittest
+from ammsml.utils.parsing import humanize_time
+
+
+class Test_humanize_time(unittest.TestCase):
+    def test_something(self):
+        self.assertEqual(True, False)
+        # TODO
+
+if __name__ == '__main__':
+    unittest.main()
-- 
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