Merge pull request #12 from osantana/add-tuple-cast-refactored

Add tuple cast refactored

CHANGES.txt

@@ -1,3 +1,8 @@
+1.2.0
+=====
+
+  - New cast type: config.tuple (converts a comma-separated string in tuple)
+
 1.1.2
 =====
 

docs/source/usage.rst

@@ -42,6 +42,7 @@ Buitin Casts
 #. ``config.boolean`` - converts values like ``On|Off``, ``1|0``, ``yes|no``,
    ``true|false`` into booleans.
 #. ``config.list`` - converts comma separated strings into lists.
+#. ``config.tuple`` - converts comma separated strings into tuples.
 #. ``config.option`` - get a return value based on specific options:
 
 .. code-block:: python

prettyconf/casts.py

@@ -64,12 +64,20 @@ def _parse(self, string):
         if element:
             elements.append("".join(element))
 
-        return [e.strip() for e in elements]
+        return self.cast(e.strip() for e in elements)
+
+    def cast(self, sequence):
+        return list(sequence)
 
     def __call__(self, value):
         return self._parse(value)
 
 
+class Tuple(List):
+    def cast(self, sequence):
+        return tuple(sequence)
+
+
 class Option(AbstractCast):
     """
     Example::

prettyconf/configuration.py

@@ -6,7 +6,7 @@
 
 from .loaders import EnvFileConfigurationLoader, IniFileConfigurationLoader, EnvVarConfigurationLoader
 from .exceptions import InvalidConfigurationFile, InvalidPath, InvalidConfigurationCast, UnknownConfiguration
-from .casts import Boolean, List, Option
+from .casts import Boolean, Option, List, Tuple
 
 
 MAGIC_FRAME_DEPTH = 3
@@ -74,6 +74,7 @@ class Configuration(object):
     # Shortcut for standard casts
     boolean = Boolean()
     list = List()
+    tuple = Tuple()
     option = Option
 
     def __init__(self, configs=None, starting_path=None, root_path="/"):

tests/test_casts.py

@@ -3,7 +3,7 @@
 
 from unittest import TestCase
 
-from prettyconf.casts import Boolean, List, Option, InvalidConfiguration
+from prettyconf.casts import Boolean, Option, InvalidConfiguration, List, Tuple
 
 
 class BooleanCastTestCase(TestCase):
@@ -39,7 +39,7 @@ def test_fail_invalid_boolean_cast(self):
             boolean(42)
 
 
-class ListCastTestCase(TestCase):
+class SequenceCastTestCase(TestCase):
     def test_basic_list_cast(self):
         l = List()
 
@@ -50,6 +50,16 @@ def test_basic_list_cast(self):
         self.assertEqual(l("foo, 'bar, baz', qux # doo "), ["foo", "'bar, baz'", "qux # doo"])
         self.assertEqual(l("foo, '\"bar\", baz  ', qux # doo "), ["foo", "'\"bar\", baz  '", "qux # doo"])
 
+    def test_basic_tuple_cast(self):
+        t = Tuple()
+
+        self.assertEqual(t("foo,bar"), ("foo", "bar"))
+        self.assertEqual(t("foo, bar"), ("foo", "bar"))
+        self.assertEqual(t(" foo , bar "), ("foo", "bar"))
+        self.assertEqual(t(" foo ,, bar "), ("foo", "", "bar"))
+        self.assertEqual(t("foo, 'bar, baz', qux # doo "), ("foo", "'bar, baz'", "qux # doo"))
+        self.assertEqual(t("foo, '\"bar\", baz  ', qux # doo "), ("foo", "'\"bar\", baz  '", "qux # doo"))
+
 
 class OptionCastTestCase(TestCase):
     def test_options(self):