[Zope-Checkins] CVS: Zope3/lib/python/Zope/PageTemplate - TALES.py:1.5

[Fred L. Drake, Jr.]

Update of /cvs-repository/Zope3/lib/python/Zope/PageTemplate
In directory cvs.zope.org:/tmp/cvs-serv23200/PageTemplate

Modified Files:
	TALES.py 
Log Message:
Add formal interfaces for the connections between TAL/METAL and TALES.
Add __implements__ "declarations" where appropriate.


=== Zope3/lib/python/Zope/PageTemplate/TALES.py 1.4 => 1.5 ===
 from SafeMapping import SafeMapping
 
+from Zope.TAL.ITALES import ITALESCompiler, ITALESEngine, ITALESErrorInfo
+
 
 NAME_RE = r"[a-zA-Z][a-zA-Z0-9_]*"
 _parse_expr = re.compile(r"(%s):" % NAME_RE).match
@@ -69,6 +71,9 @@
 
 class ErrorInfo:
     """Information about an exception passed to an on-error handler."""
+
+    __implements__ = ITALESErrorInfo
+
     def __init__(self, err, position=(None, None)):
         if isinstance(err, Exception):
             self.type = err.__class__
@@ -89,6 +94,9 @@
     these handlers.  It can provide an expression Context, which is
     capable of holding state and evaluating compiled expressions.
     '''
+
+    __implements__ = ITALESCompiler
+
     def __init__(self):
         self.types = {}
         self.base_names = {}
@@ -153,6 +161,8 @@
     An instance of this class holds context information that it can
     use to evaluate compiled expressions.
     '''
+
+    __implements__ = ITALESEngine
 
     _context_class = SafeMapping
     position = (None, None)