Commit 5f4e96b4 authored by Arnaud Fontaine's avatar Arnaud Fontaine

Add evaluateExpressionFromString allowing to evaluate a TALES

Expression string


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@43879 20353a03-c40f-0410-a6d1-a30d3c3de9de
parent 0b1dc359
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...@@ -2948,6 +2948,33 @@ def createTranslationLanguageAccessors(property_holder, property, ...@@ -2948,6 +2948,33 @@ def createTranslationLanguageAccessors(property_holder, property,
property_holder.declareProtected(accessor_dict['permission'], property_holder.declareProtected(accessor_dict['permission'],
accessor_name) accessor_name)
from zope.tales.tales import CompilerError
def evaluateExpressionFromString(expression_context, expression_string):
"""
Evaluate a TALES Expression from the given string with the given
Expression context (as returned by createExpressionContext for
instance).
Any exception normally raised when parsing and evaluating a TALES
Expression is re-raised as a ValueError.
@param expression_context: Expression context
@type expression_context: Products.PageTemplates.Expressions.ZopeContext
@param expression_string: TALES Expression string to evaluate
@type expression_string: str
"""
if expression_string is None:
return None
try:
return Expression(expression_string)(expression_context)
# An AttributeError is raised when instanciating an Expression
# class, and CompilerError and ValueError are raised in case of
# error when evaluation the expression
except (AttributeError, CompilerError, ValueError), e:
raise ValueError("Error in TALES expression: '%s': %s" % (expression_string,
str(e)))
##################################################### #####################################################
# More Useful methods which require Base # More Useful methods which require Base
......
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