DT_With.py
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上传日期:2007-01-04
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文件大小:6k
- ##############################################################################
- #
- # Zope Public License (ZPL) Version 1.0
- # -------------------------------------
- #
- # Copyright (c) Digital Creations. All rights reserved.
- #
- # This license has been certified as Open Source(tm).
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- # Redistribution and use in source and binary forms, with or without
- # modification, are permitted provided that the following conditions are
- # met:
- #
- # 1. Redistributions in source code must retain the above copyright
- # notice, this list of conditions, and the following disclaimer.
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- # 2. Redistributions in binary form must reproduce the above copyright
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- # the documentation and/or other materials provided with the
- # distribution.
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- # 3. Digital Creations requests that attribution be given to Zope
- # in any manner possible. Zope includes a "Powered by Zope"
- # button that is installed by default. While it is not a license
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- # continues to grow. This is one way to assure that growth.
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- # "This product includes software developed by Digital Creations
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- # (http://www.zope.org/)."
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- # In the event that the product being advertised includes an
- # intact Zope distribution (with copyright and license included)
- # then this clause is waived.
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- # 5. Names associated with Zope or Digital Creations must not be used to
- # endorse or promote products derived from this software without
- # prior written permission from Digital Creations.
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- # the following acknowledgment:
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- # "This product includes software developed by Digital Creations
- # for use in the Z Object Publishing Environment
- # (http://www.zope.org/)."
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- # Intact (re-)distributions of any official Zope release do not
- # require an external acknowledgement.
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- # 7. Modifications are encouraged but must be packaged separately as
- # patches to official Zope releases. Distributions that do not
- # clearly separate the patches from the original work must be clearly
- # labeled as unofficial distributions. Modifications which do not
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- # conform to all of the clauses above.
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- # Disclaimer
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- # THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS ``AS IS'' AND ANY
- # EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DIGITAL CREATIONS OR ITS
- # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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- # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- # OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- # SUCH DAMAGE.
- #
- #
- # This software consists of contributions made by Digital Creations and
- # many individuals on behalf of Digital Creations. Specific
- # attributions are listed in the accompanying credits file.
- #
- ##############################################################################
- '''Nested namespace access
- The 'with' tag is used to introduce nested namespaces.
- The text enclosed in the with tag is rendered using information
- from the given variable or expression.
- For example, if the variable 'person' is bound to an object that
- has attributes 'name' and 'age', then a 'with' tag like the
- following can be used to access these attributes::
- <!--#with person-->
- <!--#var name-->,
- <!--#var age-->
- <!--#/with-->
- Eather a 'name' or an 'expr' attribute may be used to specify data.
- A 'mapping' attribute may be used to indicate that the given data
- should be treated as mapping object, rather than as an object with
- named attributes.
- '''
- __rcs_id__='$Id: DT_With.py,v 1.10 1999/03/10 00:15:08 klm Exp $'
- __version__='$Revision: 1.10 $'[11:-2]
- from DT_Util import parse_params, name_param, InstanceDict, render_blocks, str
- from DT_Util import TemplateDict
- class With:
- blockContinuations=()
- name='with'
- mapping=None
- only=0
-
- def __init__(self, blocks):
- tname, args, section = blocks[0]
- args=parse_params(args, name='', expr='', mapping=1, only=1)
- name,expr=name_param(args,'with',1)
- if expr is None: expr=name
- else: expr=expr.eval
- self.__name__, self.expr = name, expr
- self.section=section.blocks
- if args.has_key('mapping') and args['mapping']: self.mapping=1
- if args.has_key('only') and args['only']: self.only=1
- def render(self, md):
- expr=self.expr
- if type(expr) is type(''): v=md[expr]
- else: v=expr(md)
- if not self.mapping:
- if type(v) is type(()) and len(v)==1: v=v[0]
- v=InstanceDict(v,md)
- if self.only:
- _md=md
- md=TemplateDict()
- if hasattr(_md, 'AUTHENTICATED_USER'):
- md.AUTHENTICATED_USER=_md.AUTHENTICATED_USER
- if hasattr(_md, 'validate'):
- md.validate=_md.validate
- md._push(v)
- try: return render_blocks(self.section, md)
- finally: md._pop(1)
- __call__=render