[Zope-Checkins] SVN: Zope/hotfixes/Hotfix_20080812/__init__.py added

[Andreas Jung]

Log message for revision 89731:
  added
  

Changed:
  A   Zope/hotfixes/Hotfix_20080812/__init__.py

-=-
Added: Zope/hotfixes/Hotfix_20080812/__init__.py
===================================================================
--- Zope/hotfixes/Hotfix_20080812/__init__.py	                        (rev 0)
+++ Zope/hotfixes/Hotfix_20080812/__init__.py	2008-08-12 15:00:15 UTC (rev 89731)
@@ -0,0 +1,156 @@
+
+
+# Monkey patch for LP #257276
+
+# This code is taken from the encodings module of Python 2.4.
+# Note that this code is originally (C) CNRI and it is possibly not compatible
+# with the ZPL and therefore should not live within svn.zope.org. However this
+# checkin is blessed by Jim Fulton for now. The fix is no longer required with
+# Python 2.5 and hopefully fixed in Python 2.4.6 release.
+
+
+def search_function(encoding):
+
+    # Cache lookup
+    entry = _cache.get(encoding, _unknown)
+    if entry is not _unknown:
+        return entry
+
+    # Import the module:
+    #
+    # First try to find an alias for the normalized encoding
+    # name and lookup the module using the aliased name, then try to
+    # lookup the module using the standard import scheme, i.e. first
+    # try in the encodings package, then at top-level.
+    #
+    norm_encoding = normalize_encoding(encoding)
+    aliased_encoding = _aliases.get(norm_encoding) or \
+                       _aliases.get(norm_encoding.replace('.', '_'))
+    if aliased_encoding is not None:
+        modnames = [aliased_encoding,
+                    norm_encoding]
+    else:
+        modnames = [norm_encoding]
+    for modname in modnames:
+
+        if not modname or '.' in modname:
+            continue
+
+        try:
+            mod = __import__(modname,
+                             globals(), locals(), _import_tail)
+            if not mod.__name__.startswith('encodings.'):
+                continue
+
+        except ImportError:
+            pass
+        else:
+            break
+    else:
+        mod = None
+
+    try:
+        getregentry = mod.getregentry
+    except AttributeError:
+        # Not a codec module
+        mod = None
+
+    if mod is None:
+        # Cache misses
+        _cache[encoding] = None
+        return None
+
+    # Now ask the module for the registry entry
+    entry = tuple(getregentry())
+    if len(entry) != 4:
+        raise CodecRegistryError,\
+              'module "%s" (%s) failed to register' % \
+              (mod.__name__, mod.__file__)
+    for obj in entry:
+        if not callable(obj):
+            raise CodecRegistryError,\
+                  'incompatible codecs in module "%s" (%s)' % \
+                  (mod.__name__, mod.__file__)
+
+    # Cache the codec registry entry
+    _cache[encoding] = entry
+
+    # Register its aliases (without overwriting previously registered
+    # aliases)
+    try:
+        codecaliases = mod.getaliases()
+    except AttributeError:
+        pass
+    else:
+        for alias in codecaliases:
+            if not _aliases.has_key(alias):
+                _aliases[alias] = modname
+
+    # Return the registry entry
+    return entry
+
+
+# MONKEY
+
+import encodings
+encodings.search_function.func_code = search_function.func_code
+
+
+from Products.PythonScript.PythonScript import PythonScript
+
+
+def _exec(self, bound_names, args, kw):
+    """Call a Python Script
+
+    Calling a Python Script is an actual function invocation.
+    """
+    # Retrieve the value from the cache.
+    keyset = None
+    if self.ZCacheable_isCachingEnabled():
+        # Prepare a cache key.
+        keyset = kw.copy()
+        asgns = self.getBindingAssignments()
+        name_context = asgns.getAssignedName('name_context', None)
+        if name_context:
+            keyset[name_context] = aq_parent(self).getPhysicalPath()
+        name_subpath = asgns.getAssignedName('name_subpath', None)
+        if name_subpath:
+            keyset[name_subpath] = self._getTraverseSubpath()
+        # Note: perhaps we should cache based on name_ns also.
+        keyset['*'] = args
+        result = self.ZCacheable_get(keywords=keyset, default=_marker)
+        if result is not _marker:
+            # Got a cached value.
+            return result
+
+    #__traceback_info__ = bound_names, args, kw, self.func_defaults
+
+    ft = self._v_ft
+    if ft is None:
+        __traceback_supplement__ = (
+            PythonScriptTracebackSupplement, self)
+        raise RuntimeError, '%s %s has errors.' % (self.meta_type, self.id)
+
+    fcode, g, fadefs = ft
+    g = g.copy()
+    if bound_names is not None:
+        g.update(bound_names)
+    g['__traceback_supplement__'] = (
+        PythonScriptTracebackSupplement, self, -1)
+    g['__file__'] = getattr(self, '_filepath', None) or self.get_filepath()
+    f = new.function(fcode, g, None, fadefs)
+
+    try:
+        result = f(*args, **kw)
+    except SystemExit:
+        raise ValueError('SystemExit can not raised with a PythonScript')
+
+    if keyset is not None:
+        # Store the result in the cache.
+        self.ZCacheable_set(result, keywords=keyset)
+    return result
+
+
+PythonScript._exec = _exec
+
+