Provide an opportunity for third-party products to use a full

Unicode-aware StringIO by monkey-patching two appropriate methods
until one is completely integrated into Zope.

lib/python/Products/PageTemplates/PageTemplate.py

@@ -15,7 +15,7 @@
 HTML- and XML-based template objects using TAL, TALES, and METAL.
 """
 
-__version__='$Revision: 1.25 $'[11:-2]
+__version__='$Revision: 1.26 $'[11:-2]
 
 import sys
 
@@ -43,6 +43,11 @@ class PageTemplate(Base):
     _text = ''
     _error_start = '<!-- Page Template Diagnostics'
 
+    def StringIO(self):
+        # Third-party products wishing to provide a full Unicode-aware
+        # StringIO can do so by monkey-patching this method.
+        return StringIO()
+
     def macros(self):
         return self.pt_macros()
     macros = ComputedAttribute(macros, 1)
@@ -80,7 +85,7 @@ class PageTemplate(Base):
 
         if self._v_errors:
             raise PTRuntimeError, 'Page Template %s has errors.' % self.id
-        output = StringIO()
+        output = self.StringIO()
         c = self.pt_getContext()
         c.update(extra_context)
 

lib/python/TAL/TALInterpreter.py

@@ -114,6 +114,11 @@ class TALInterpreter:
         self.scopeLevel = 0
         self.sourceFile = None
 
+    def StringIO(self):
+        # Third-party products wishing to provide a full Unicode-aware
+        # StringIO can do so by monkey-patching this method.
+        return StringIO()
+
     def saveState(self):
         return (self.position, self.col, self.stream,
                 self.scopeLevel, self.level)
@@ -319,7 +324,7 @@ class TALInterpreter:
 
     def no_tag(self, start, program):
         state = self.saveState()
-        self.stream = stream = StringIO()
+        self.stream = stream = self.StringIO()
         self._stream_write = stream.write
         self.interpret(start)
         self.restoreOutputState(state)
@@ -565,7 +570,7 @@ class TALInterpreter:
 
     def do_onError_tal(self, (block, handler)):
         state = self.saveState()
-        self.stream = stream = StringIO()
+        self.stream = stream = self.StringIO()
         self._stream_write = stream.write
         try:
             self.interpret(block)