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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 AccessControl import ClassSecurityInfo
from Products.TALESField._tales import Expression, getExprContext
from Products.Archetypes.Field import encode
from Products.Archetypes.Field import ObjectField
from Products.Archetypes.Widget import LinesWidget
from Products.Archetypes.Registry import registerField
class TALESString(ObjectField):
_properties = ObjectField._properties.copy()
_properties.update({
'type' : 'tales',
'default': 'python: True',
'default_content_type' : 'text/plain',
'required': True,
'validators': ('talesvalidator',)
})
security = ClassSecurityInfo()
security.declarePrivate('get')
def get(self, instance, **kwargs):
# Get the Expression
expr = ObjectField.get(self, instance, **kwargs)
# use a custom context if it has been passed in
context = kwargs.get('expression_context')
if context is None:
context = getExprContext(instance, instance)
# Expression's __call__ returns a context dictionary if the
# expression's text is an empty string. We return None instead.
if expr.text.strip():
# Return the evaluated expression
value = expr(context)
return encode(value, instance, **kwargs)
else:
return None
security.declarePrivate('getRaw')
def getRaw(self, instance, **kwargs):
# Get the Expression
expr = ObjectField.get(self, instance, **kwargs)
# Return the expression text
return getattr(expr, 'text', expr)
security.declarePrivate('set')
def set(self, instance, value, **kwargs):
if not isinstance(value, Expression.Expression):
value = Expression.Expression(value)
ObjectField.set(self, instance, value, **kwargs)
def getDefault(self, instance):
value = ObjectField.getDefault(self, instance)
return Expression.Expression(value)
registerField(TALESString,
title='TALES String',
description=('A field that can take a TALES expression '
'and evaluate it.'))
class TALESLines(ObjectField):
_properties = ObjectField._properties.copy()
_properties.update({
'type': 'taleslines',
'default': ['python: True'],
'widget': LinesWidget,
'required': True,
'validators': ('talesvalidator',)
})
security = ClassSecurityInfo()
security.declarePrivate('get')
def get(self, instance, **kwargs):
# Get Expressions
exprs = ObjectField.get(self, instance, **kwargs)
# use a custom context if it has been passed in
context = kwargs.get('expression_context')
if context is None:
context = getExprContext(instance, instance)
# Return evaluated expressions, and check for empty expr texts.
value = []
for expr in exprs:
if expr.text.strip():
line = expr(context)
value.append(encode(line, instance, **kwargs))
else:
value.append(None)
return value
security.declarePrivate('getRaw')
def getRaw(self, instance, **kwargs):
# Get Expressions
exprs = ObjectField.get(self, instance, **kwargs)
# Return text
return [expr.text for expr in exprs]
security.declarePrivate('set')
def set(self, instance, value, **kwargs):
value = [isinstance(expr, Expression.Expression) and expr or
Expression.Expression(expr) for expr in value]
ObjectField.set(self, instance, value, **kwargs)
def getDefault(self, instance):
exprs = ObjectField.getDefault(self, instance)
return [Expression.Expression(expr) for expr in exprs]
registerField(TALESLines,
title='TALES Lines',
description='A field that takes lines (i.e., a list) of TALES '
'expressions and evalutes them.')
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