Set IDecimal attributes min, max and default as Decimal typ…

…e instead of `Number`.

CHANGES.rst

@@ -5,6 +5,10 @@
 5.0 (unreleased)
 ================
 
+- Set ``IDecimal`` attributes ``min``, ``max`` and ``default`` as ``Decimal``
+  type instead of ``Number``.
+  See `issue 88 <https://github.com/zopefoundation/zope.schema/issues/88>`_.
+
 - Enable unicode normalization for ``Text`` fields.
   The default is NFC normalization. Valid forms are 'NFC', 'NFKC', 'NFD', and
   'NFKD'. To disable normalization, set ``unicode_normalization`` to ``False``

src/zope/schema/_bootstrapfields.py

@@ -901,6 +901,69 @@ class Int(Integral):
     _unicode_converters = (int,)
 
 
+class InvalidDecimalLiteral(ValueError, ValidationError):
+    "Raised by decimal fields"
+
+
+class Decimal(Number):
+    """
+    A field representing a native :class:`decimal.Decimal` and implementing
+    :class:`zope.schema.interfaces.IDecimal`.
+
+    The :meth:`fromUnicode` method only accepts values that can be parsed
+    by the ``Decimal`` constructor::
+
+        >>> from zope.schema._field import Decimal
+        >>> f = Decimal()
+        >>> f.fromUnicode("1")
+        Decimal('1')
+        >>> f.fromUnicode("125.6")
+        Decimal('125.6')
+        >>> f.fromUnicode("1+0j") # doctest: +IGNORE_EXCEPTION_DETAIL
+        Traceback (most recent call last):
+        ...
+        InvalidDecimalLiteral: Invalid literal for Decimal(): 1+0j
+        >>> f.fromUnicode("1/2") # doctest: +IGNORE_EXCEPTION_DETAIL
+        Traceback (most recent call last):
+        ...
+        InvalidDecimalLiteral: Invalid literal for Decimal(): 1/2
+        >>> f.fromUnicode(str(2**31234) + '.' + str(2**256)) # doctest: +ELLIPSIS
+        Decimal('2349...936')
+        >>> f.fromUnicode("not a number") # doctest: +IGNORE_EXCEPTION_DETAIL
+        Traceback (most recent call last):
+        ...
+        InvalidDecimalLiteral: could not convert string to float: not a number
+
+    Likewise for :meth:`fromBytes`::
+
+        >>> from zope.schema._field import Decimal
+        >>> f = Decimal()
+        >>> f.fromBytes(b"1")
+        Decimal('1')
+        >>> f.fromBytes(b"125.6")
+        Decimal('125.6')
+        >>> f.fromBytes(b"1+0j") # doctest: +IGNORE_EXCEPTION_DETAIL
+        Traceback (most recent call last):
+        ...
+        InvalidDecimalLiteral: Invalid literal for Decimal(): 1+0j
+        >>> f.fromBytes(b"1/2") # doctest: +IGNORE_EXCEPTION_DETAIL
+        Traceback (most recent call last):
+        ...
+        InvalidDecimalLiteral: Invalid literal for Decimal(): 1/2
+        >>> f.fromBytes((str(2**31234) + '.' + str(2**256)).encode("ascii")) # doctest: +ELLIPSIS
+        Decimal('2349...936')
+        >>> f.fromBytes(b"not a number") # doctest: +IGNORE_EXCEPTION_DETAIL
+        Traceback (most recent call last):
+        ...
+        InvalidDecimalLiteral: could not convert string to float: not a number
+
+
+    """
+    _type = decimal.Decimal
+    _unicode_converters = (decimal.Decimal,)
+    _validation_error = InvalidDecimalLiteral
+
+
 class _ObjectsBeingValidated(threading.local):
 
     def __init__(self):

src/zope/schema/_field.py

@@ -25,7 +25,6 @@
 from datetime import date
 from datetime import timedelta
 from datetime import time
-import decimal
 import re
 
 
@@ -106,6 +105,8 @@
 from zope.schema._bootstrapfields import Int
 from zope.schema._bootstrapfields import Integral
 from zope.schema._bootstrapfields import Number
+from zope.schema._bootstrapfields import InvalidDecimalLiteral  # reimport
+from zope.schema._bootstrapfields import Decimal
 from zope.schema._bootstrapfields import Password
 from zope.schema._bootstrapfields import Rational
 from zope.schema._bootstrapfields import Real
@@ -147,6 +148,7 @@
 classImplements(Rational, IRational)
 classImplements(Integral, IIntegral)
 classImplements(Int, IInt)
+classImplements(Decimal, IDecimal)
 
 classImplements(Object, IObject)
 
@@ -315,70 +317,6 @@ class Float(Real):
     _validation_error = InvalidFloatLiteral
 
 
-class InvalidDecimalLiteral(ValueError, ValidationError):
-    "Raised by decimal fields"
-
-
-@implementer(IDecimal)
-class Decimal(Number):
-    """
-    A field representing a native :class:`decimal.Decimal` and implementing
-    :class:`zope.schema.interfaces.IDecimal`.
-
-    The :meth:`fromUnicode` method only accepts values that can be parsed
-    by the ``Decimal`` constructor::
-
-        >>> from zope.schema._field import Decimal
-        >>> f = Decimal()
-        >>> f.fromUnicode("1")
-        Decimal('1')
-        >>> f.fromUnicode("125.6")
-        Decimal('125.6')
-        >>> f.fromUnicode("1+0j") # doctest: +IGNORE_EXCEPTION_DETAIL
-        Traceback (most recent call last):
-        ...
-        InvalidDecimalLiteral: Invalid literal for Decimal(): 1+0j
-        >>> f.fromUnicode("1/2") # doctest: +IGNORE_EXCEPTION_DETAIL
-        Traceback (most recent call last):
-        ...
-        InvalidDecimalLiteral: Invalid literal for Decimal(): 1/2
-        >>> f.fromUnicode(str(2**31234) + '.' + str(2**256)) # doctest: +ELLIPSIS
-        Decimal('2349...936')
-        >>> f.fromUnicode("not a number") # doctest: +IGNORE_EXCEPTION_DETAIL
-        Traceback (most recent call last):
-        ...
-        InvalidDecimalLiteral: could not convert string to float: not a number
-
-    Likewise for :meth:`fromBytes`::
-
-        >>> from zope.schema._field import Decimal
-        >>> f = Decimal()
-        >>> f.fromBytes(b"1")
-        Decimal('1')
-        >>> f.fromBytes(b"125.6")
-        Decimal('125.6')
-        >>> f.fromBytes(b"1+0j") # doctest: +IGNORE_EXCEPTION_DETAIL
-        Traceback (most recent call last):
-        ...
-        InvalidDecimalLiteral: Invalid literal for Decimal(): 1+0j
-        >>> f.fromBytes(b"1/2") # doctest: +IGNORE_EXCEPTION_DETAIL
-        Traceback (most recent call last):
-        ...
-        InvalidDecimalLiteral: Invalid literal for Decimal(): 1/2
-        >>> f.fromBytes((str(2**31234) + '.' + str(2**256)).encode("ascii")) # doctest: +ELLIPSIS
-        Decimal('2349...936')
-        >>> f.fromBytes(b"not a number") # doctest: +IGNORE_EXCEPTION_DETAIL
-        Traceback (most recent call last):
-        ...
-        InvalidDecimalLiteral: could not convert string to float: not a number
-
-
-    """
-    _type = decimal.Decimal
-    _unicode_converters = (decimal.Decimal,)
-    _validation_error = InvalidDecimalLiteral
-
-
 @implementer(IDatetime)
 class Datetime(Orderable, Field):
     __doc__ = IDatetime.__doc__

src/zope/schema/interfaces.py

@@ -23,6 +23,7 @@
 
 from zope.schema._bootstrapfields import Bool
 from zope.schema._bootstrapfields import Complex
+from zope.schema._bootstrapfields import Decimal
 from zope.schema._bootstrapfields import Field
 from zope.schema._bootstrapfields import Int
 from zope.schema._bootstrapfields import Integral
@@ -644,6 +645,24 @@ class IFloat(IReal):
 class IDecimal(INumber):
     """Field containing a :class:`decimal.Decimal`"""
 
+    min = Decimal(
+        title=_("Start of the range"),
+        required=False,
+        default=None
+        )
+
+    max = Decimal(
+        title=_("End of the range (including the value itself)"),
+        required=False,
+        default=None
+        )
+
+    default = Decimal(
+        title=_("Default Value"),
+        description=_("""The field default value may be None or a legal
+                        field value""")
+        )
+
 ###
 # End numbers
 ###

src/zope/schema/tests/test__bootstrapfields.py

@@ -11,6 +11,7 @@
 # FOR A PARTICULAR PURPOSE.
 #
 ##############################################################################
+import decimal
 import doctest
 import unittest
 import unicodedata
@@ -1245,10 +1246,7 @@ def test_validate_required(self):
         field.validate(-1)
         self.assertRaises(RequiredMissing, field.validate, None)
 
-
-
     def test_fromUnicode_miss(self):
-
         txt = self._makeOne()
         self.assertRaises(ValueError, txt.fromUnicode, u'')
         self.assertRaises(ValueError, txt.fromUnicode, u'False')
@@ -1278,6 +1276,62 @@ def test_ctor_defaults(self):
         self.assertEqual(txt._type, integer_types)
 
 
+class DecimalTests(NumberTests):
+
+    mvm_missing_value = decimal.Decimal("-1")
+    mvm_default = decimal.Decimal("0")
+
+    MIN = decimal.Decimal(NumberTests.MIN)
+    MAX = decimal.Decimal(NumberTests.MAX)
+    VALID = tuple(decimal.Decimal(x) for x in NumberTests.VALID)
+    TOO_SMALL = tuple(decimal.Decimal(x) for x in NumberTests.TOO_SMALL)
+    TOO_BIG = tuple(decimal.Decimal(x) for x in NumberTests.TOO_BIG)
+
+    def _getTargetClass(self):
+        from zope.schema._bootstrapfields import Decimal
+        return Decimal
+
+    def _getTargetInterface(self):
+        from zope.schema.interfaces import IDecimal
+        return IDecimal
+
+    def test_validate_not_required(self):
+        field = self._makeOne(required=False)
+        field.validate(decimal.Decimal("10.0"))
+        field.validate(decimal.Decimal("0.93"))
+        field.validate(decimal.Decimal("1000.0003"))
+        field.validate(None)
+
+    def test_validate_required(self):
+        from zope.schema.interfaces import RequiredMissing
+        field = self._makeOne()
+        field.validate(decimal.Decimal("10.0"))
+        field.validate(decimal.Decimal("0.93"))
+        field.validate(decimal.Decimal("1000.0003"))
+        self.assertRaises(RequiredMissing, field.validate, None)
+
+    def test_fromUnicode_miss(self):
+        from zope.schema.interfaces import ValidationError
+        flt = self._makeOne()
+        self.assertRaises(ValueError, flt.fromUnicode, u'')
+        self.assertRaises(ValueError, flt.fromUnicode, u'abc')
+        with self.assertRaises(ValueError) as exc:
+            flt.fromUnicode(u'1.4G')
+
+        value_error = exc.exception
+        self.assertIs(value_error.field, flt)
+        self.assertEqual(value_error.value, u'1.4G')
+        self.assertIsInstance(value_error, ValidationError)
+
+    def test_fromUnicode_hit(self):
+        from decimal import Decimal
+
+        flt = self._makeOne()
+        self.assertEqual(flt.fromUnicode(u'0'), Decimal('0.0'))
+        self.assertEqual(flt.fromUnicode(u'1.23'), Decimal('1.23'))
+        self.assertEqual(flt.fromUnicode(u'12345.6'), Decimal('12345.6'))
+
+
 class ObjectTests(EqualityTestsMixin,
                   WrongTypeTestsMixin,
                   unittest.TestCase):

src/zope/schema/tests/test__field.py

@@ -12,7 +12,6 @@
 #
 ##############################################################################
 import datetime
-import decimal
 import doctest
 import unittest
 
@@ -314,62 +313,6 @@ def test_fromUnicode_hit(self):
         self.assertEqual(flt.fromUnicode(u'1.23e6'), 1230000.0)
 
 
-class DecimalTests(NumberTests):
-
-    mvm_missing_value = decimal.Decimal("-1")
-    mvm_default = decimal.Decimal("0")
-
-    MIN = decimal.Decimal(NumberTests.MIN)
-    MAX = decimal.Decimal(NumberTests.MAX)
-    VALID = tuple(decimal.Decimal(x) for x in NumberTests.VALID)
-    TOO_SMALL = tuple(decimal.Decimal(x) for x in NumberTests.TOO_SMALL)
-    TOO_BIG = tuple(decimal.Decimal(x) for x in NumberTests.TOO_BIG)
-
-    def _getTargetClass(self):
-        from zope.schema._field import Decimal
-        return Decimal
-
-    def _getTargetInterface(self):
-        from zope.schema.interfaces import IDecimal
-        return IDecimal
-
-    def test_validate_not_required(self):
-        field = self._makeOne(required=False)
-        field.validate(decimal.Decimal("10.0"))
-        field.validate(decimal.Decimal("0.93"))
-        field.validate(decimal.Decimal("1000.0003"))
-        field.validate(None)
-
-    def test_validate_required(self):
-        from zope.schema.interfaces import RequiredMissing
-        field = self._makeOne()
-        field.validate(decimal.Decimal("10.0"))
-        field.validate(decimal.Decimal("0.93"))
-        field.validate(decimal.Decimal("1000.0003"))
-        self.assertRaises(RequiredMissing, field.validate, None)
-
-    def test_fromUnicode_miss(self):
-        from zope.schema.interfaces import ValidationError
-        flt = self._makeOne()
-        self.assertRaises(ValueError, flt.fromUnicode, u'')
-        self.assertRaises(ValueError, flt.fromUnicode, u'abc')
-        with self.assertRaises(ValueError) as exc:
-            flt.fromUnicode(u'1.4G')
-
-        value_error = exc.exception
-        self.assertIs(value_error.field, flt)
-        self.assertEqual(value_error.value, u'1.4G')
-        self.assertIsInstance(value_error, ValidationError)
-
-    def test_fromUnicode_hit(self):
-        from decimal import Decimal
-
-        flt = self._makeOne()
-        self.assertEqual(flt.fromUnicode(u'0'), Decimal('0.0'))
-        self.assertEqual(flt.fromUnicode(u'1.23'), Decimal('1.23'))
-        self.assertEqual(flt.fromUnicode(u'12345.6'), Decimal('12345.6'))
-
-
 class DatetimeTests(OrderableMissingValueMixin,
                     OrderableTestsMixin,
                     EqualityTestsMixin,