Expression Engine

class zope.tales.tales.Context(engine, contexts)

Expression engine, an implementation of zope.tal.interfaces.ITALExpressionEngine.

This class is called Context because an instance of this class holds context information (namespaces) that it uses when evaluating compiled expressions.

Parameters:

• engine – A ExpressionEngine (a zope.tal.interfaces.ITALExpressionCompiler)

• contexts – A mapping (namespace) of variables that forms the base variable scope.

Exceptions

A number of exceptions are defined.

class zope.tales.tales.TALESError

Error during TALES evaluation

class zope.tales.tales.Undefined

Exception raised on traversal of an undefined path.

class zope.tales.tales.CompilerError

TALES Compiler Error

class zope.tales.tales.RegistrationError

Expression type or base name registration Error.