recast and silencers added

CHANGELOG.md

+## v2.0.14
+
+* Dodano `rethrow_as`
+
 ## v2.0.13
 
 * Python 3.4 znów wspierany

satella/coding/__init__.py

@@ -9,10 +9,13 @@ from .monitor import Monitor, RMonitor
 from .structures import TimeBasedHeap, CallableGroup, Heap
 from .typecheck import typed, List, Tuple, Dict, NewType, Callable, Sequence, \
     TypeVar, Generic, Mapping, Iterable, Union, Any, Optional, CallSignature, Number
+from .recast_exceptions import rethrow_as, silence_excs
 
 __all__ = [
     'TimeBasedHeap', 'Heap', 'CallableGroup',
     'Monitor', 'RMonitor', 'merge_dicts',
     'typed', 'List', 'Tuple', 'Dict', 'NewType', 'Callable', 'Sequence',
-    'TypeVar', 'Generic', 'Mapping', 'Iterable', 'Union', 'Any', 'Optional', 'CallSignature', 'Number'
+    'TypeVar', 'Generic', 'Mapping', 'Iterable', 'Union', 'Any', 'Optional', 'CallSignature', 'Number',
+    'rethrow_as', 'silence_excs'
 ]
+

satella/coding/recast_exceptions.py

+# coding=UTF-8
+from __future__ import print_function, absolute_import, division
+import six
+import logging
+import functools
+
+logger = logging.getLogger(__name__)
+
+__all__ = [
+    'silence',
+    'rethrow_as'
+]
+
+
+def silence_excs(*exc_types):
+    return rethrow_as(*[(t, None) for t in exc_types])
+
+
+class rethrow_as(object):
+    """Decorator + context manager"""
+
+    def __init__(self, *pairs, exception_preprocessor=repr):
+        self.to_catch = tuple(p[0] for p in pairs)
+        self.pairs = pairs
+        self.exception_preprocessor = exception_preprocessor
+
+    def __call__(self, fun):
+        @functools.wraps(fun)
+        def inner(*args, **kwargs):
+            with self:
+                return fun(*args, **kwargs)
+        return inner
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+
+        if not isinstance(exc_val, self.to_catch):
+            return
+
+        for from_, to in self.pairs:
+            if isinstance(exc_val, from_):
+                if to is None:
+                    return True
+                else:
+                    raise to(self.exception_preprocessor(exc_val))

setup.cfg

 [metadata]
 name = satella
-version = 2.0.13
+version = 2.0.14rc1
 description-file = README.md
 author = Piotr Maślanka
 author_email = piotrm@smok.co

tests/test_coding/test_rethrow.py

+# coding=UTF-8
+from __future__ import print_function, absolute_import, division
+import six
+import unittest
+from satella.coding import rethrow_as, silence_excs
+
+
+class TestStuff(unittest.TestCase):
+
+    def test_silencer(self):
+        with silence_excs(TypeError):
+            raise TypeError()
+
+    def test_rethrow(self):
+        try:
+            with rethrow_as((ValueError, NameError)):
+                raise ValueError()
+        except NameError:
+            return
+
+        self.fail()
+
+
+