From cdae91d72b7bfa5edb26e12e721891a3ce2f2aa7 Mon Sep 17 00:00:00 2001
From: Chris McDonough <chrism@agendaless.com>
Date: Mon, 19 Apr 2010 08:58:54 +0000
Subject: Pass along translate function to templates.

---
 repoze/bfg/i18n.py | 96 ++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 64 insertions(+), 32 deletions(-)

(limited to 'repoze/bfg/i18n.py')

diff --git a/repoze/bfg/i18n.py b/repoze/bfg/i18n.py
index bc0ae4423..6fa809bf6 100644
--- a/repoze/bfg/i18n.py
+++ b/repoze/bfg/i18n.py
@@ -1,32 +1,48 @@
+import re
+
 from zope.interface import implements
 from zope.interface import classProvides
 
 from repoze.bfg.interfaces import ITranslator
 from repoze.bfg.interfaces import ITranslatorFactory
+from repoze.bfg.interfaces import IChameleonTranslate
+
 from repoze.bfg.threadlocal import get_current_registry
 from repoze.bfg.threadlocal import get_current_request
 
-def get_translator(request):
-    try:
-        reg = request.registry
-    except AttributeError:
-        reg = get_current_registry()
-
-    if reg is None: # pragma: no cover
-        return None # only in insane circumstances
+def get_translator(request, translator_factory=None):
+    """ Return a :term:`translator` for the given request based on the
+    :term:`translator factory` registered for the current application
+    and the :term:`request` passed in as the request object.  If no
+    translator factory was sent to the
+    :class:`repoze.bfg.configuration.Configurator` constructor at
+    application startup, this function will return ``None``.
 
+    Note that the translation factory will only be called once per
+    request instance.
+    """
+    
     translator = getattr(request, '_bfg_translator', None)
 
     if translator is False:
         return None
 
     if translator is None:
-        translator_factory = reg.queryUtility(ITranslatorFactory)
+        if translator_factory is None:
+            try:
+                reg = request.registry
+            except AttributeError:
+                reg = get_current_registry()
+            if reg is None: # pragma: no cover
+                return None # only in insane circumstances
+            translator_factory = reg.queryUtility(ITranslatorFactory)
+
         if translator_factory is None:
             request_value = False
         else:
             translator = translator_factory(request)
             request_value = translator
+
         try:
             request._bfg_translator = request_value
         except AttributeError: # pragma: no cover
@@ -41,8 +57,8 @@ class InterpolationOnlyTranslator(object):
         self.request = request
 
     def __call__(self, message):
-        mapping = getattr(message, 'mapping', {}) #should be a TranslationString
-        return message % mapping
+        mapping = getattr(message, 'mapping', None)
+        return interpolate(message, mapping)
 
 class TranslationString(unicode):
     __slots__ = ('msgid', 'domain', 'mapping')
@@ -61,27 +77,43 @@ class TranslationString(unicode):
     def __getstate__(self):
         return unicode(self), self.msgid, self.domain, self.mapping
 
-def chameleon_translate(text, domain=None, mapping=None, context=None,
-                        target_language=None, default=None):
-    if text is None:
-        return None
-    translator = None
-    request = get_current_request()
-    if request is not None:
-        request.chameleon_target_language = target_language
-        translator = get_translator(request)
-    if default is None:
-        default = text
-    if mapping is None:
-        mapping = {}
-    if translator is None:
-        return unicode(default) % mapping
-    if not isinstance(text, TranslationString):
-        text = TranslationString(default, msgid=text, domain=domain,
-                                 mapping=mapping)
-    return translator(text)
+class ChameleonTranslate(object):
+    implements(IChameleonTranslate)
+    def __init__(self, translator_factory):
+        self.translator_factory = translator_factory
+
+    def __call__(self, text, domain=None, mapping=None, context=None,
+                 target_language=None, default=None):
+        if text is None:
+            return None
+        translator = None
+        request = get_current_request()
+        if request is not None:
+            request.chameleon_target_language = target_language
+            translator = get_translator(request, self.translator_factory)
+        if default is None:
+            default = text
+        if mapping is None:
+            mapping = {}
+        if translator is None:
+            return unicode(default) % mapping
+        if not isinstance(text, TranslationString):
+            text = TranslationString(default, msgid=text, domain=domain,
+                                     mapping=mapping)
+        return translator(text)
         
     
+NAME_RE = r"[a-zA-Z][-a-zA-Z0-9_]*"
+
+_interp_regex = re.compile(r'(?<!\$)(\$(?:(%(n)s)|{(%(n)s)}))'
+    % ({'n': NAME_RE}))
     
-    
-    
+def interpolate(text, mapping=None):
+    def replace(match):
+        whole, param1, param2 = match.groups()
+        return unicode(mapping.get(param1 or param2, whole))
+
+    if not text or not mapping:
+        return text
+
+    return _interp_regex.sub(replace, text)
-- 
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