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##############################################################################
#
# TALESField - Field with TALES support for Archetypes
# Copyright (C) 2005 Sidnei da Silva, Daniel Nouri and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
##############################################################################
"""
$Id: __init__.py,v 1.2 2005/02/26 17:56:10 sidnei Exp $
"""
from Products.validation import validation, interfaces
from Products.PageTemplates.Expressions import getEngine
import Products.PageTemplates.TALES as TALES
class TALESValidator:
""" Validator for TALES Expressions
Basically, if the expression compiles it's a valid expression,
otherwise it's invalid and you get a message saying that the
expression has errors.
>>> validator = TALESValidator()
>>> validator('python: True')
1
>>> validator('foo: bar')
'TALES expression "foo: bar" has errors.'
>>> validator('string: Yes')
1
Try a SyntaxError:
>>> validator('python: True False')
'TALES expression "python: True False" has errors.'
Unbalanced parens:
>>> validator('python: 1 + (4 * 5')
'TALES expression "python: 1 + (4 * 5" has errors.'
Trash:
>>> validator('xdfaydf asdf')
'TALES expression "xdfaydf asdf" has errors.'
The validator also accepts lists of expressions:
>>> validator(['python: True', 'xdfaydf asdf'])
'TALES expression "xdfaydf asdf" has errors.'
"""
__implements__ = (interfaces.ivalidator,)
name = 'talesvalidator'
def __call__(self, value, *args, **kwargs):
if type(value) != type([]) and type(value) != type(()):
value=(value,)
for expr in value:
try:
if expr.strip():
getEngine().compile(expr)
except TALES.CompilerError, e:
return 'TALES expression "%s" has errors.' % expr
return 1
validation.register(TALESValidator())
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