numbers: Use cdecimal by default when available

The drop-in replacement cdecimal is a CPython extension that implements the same
decimal interface with a much better performance.  Whenever it is installed, we
favour its use.

2 files changed, 20 insertions, 2 deletions

diff --git a/babel/_compat.py b/babel/_compat.py
index 0f7640d..78cd35a 100644
--- a/babel/_compat.py
+++ b/babel/_compat.py
@@ -54,3 +54,22 @@ else:
 
 
 number_types = integer_types + (float,)
+
+
+#
+# Use cdecimal when available
+#
+from decimal import (Decimal as _dec,
+                     InvalidOperation as _invop,
+                     ROUND_HALF_EVEN as _RHE)
+try:
+    from cdecimal import (Decimal as _cdec,
+                          InvalidOperation as _cinvop,
+                          ROUND_HALF_EVEN as _CRHE)
+    Decimal = _cdec
+    InvalidOperation = (_invop, _cinvop)
+    ROUND_HALF_EVEN = _CRHE
+except ImportError:
+    Decimal = _dec
+    InvalidOperation = _invop
+    ROUND_HALF_EVEN = _RHE
diff --git a/babel/numbers.py b/babel/numbers.py
index f92c714..a15f399 100644
--- a/babel/numbers.py
+++ b/babel/numbers.py
@@ -20,10 +20,9 @@
 #  - http://www.unicode.org/reports/tr35/ (Appendix G.6)
 import re
 from datetime import date as date_, datetime as datetime_
-from decimal import Decimal, InvalidOperation, ROUND_HALF_EVEN
 
 from babel.core import default_locale, Locale, get_global
-from babel._compat import range_type
+from babel._compat import range_type, Decimal, InvalidOperation, ROUND_HALF_EVEN
 
 
 LC_NUMERIC = default_locale('LC_NUMERIC')