[Zope] Re: [ZPT] Recursive structures
Ian Bicking wrote: I'm surprised this has never come up for me before, but now I want to render a recursive data structure and I'm at a loss how I might do that in ZPT. Or, what the best workaround would be. E.g.: ['a', 'b', ['c', ['d', 'e']]] Becomes: ul lia/li lib/li ul lic/li ul lid/li lie/li /ul /ul /ul I guess the template could call itself repeatedly. Which means the list can't be embedded in any other markup. Hrm... in Cheetah I'd do: #def make_list(items) ul #for item in items #if isinstance(item, list) $make_list(item) #else li$item/li #end if #end for /ul #end def $make_list(items) It's a code-heavy template, and maybe it should just be written in Python, but it's also reasonable to allow people to add classes to items, further logic, etc. I think it should *definitely* be written in Python, although a Script (Python) should suffice. Add a Script (Python) with an ID of make_list and a parameter list of items The following is untested, but should work, I think. Beware of any special text in the strings (,,,etc). ## text = ul\n for item in items: if isinstance( item, ( list, tuple )): text += context.make_list( item ) else: text += li + str(item) + /li\n return text + /ul ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
[Zope] Re: [ZPT] Recursive structures
Nikko Wolf schrieb: Ian Bicking wrote: I'm surprised this has never come up for me before, but now I want to render a recursive data structure and I'm at a loss how I might do that in ZPT. Or, what the best workaround would be. E.g.: ['a', 'b', ['c', ['d', 'e']]] Becomes: ul lia/li lib/li ul lic/li ul lid/li lie/li /ul /ul /ul The code above is not valid HTML[1]. This is one way how to do it: ul tal:define=nodes python:['a', 'b', ['c', ['d', 'e']]] li metal:define-macro=item tal:repeat=node nodes span tal:define=global is_list python:same_type([], node); content python:is_list and 'list:' or node tal:replace=content/ ul tal:condition=is_list tal:define=nodes node li metal:use-macro=template/macros/item/ /ul /li /ul I guess the template could call itself repeatedly. Which means the list can't be embedded in any other markup. To embed it in another template simply call it: ul tal:replace=structure here/list/ (Or define a macro and use that). Even better if the logic is in a script that renders the template, I think. Tonico [1] ul can not have ul as parent http://zvon.org/xxl/xhtmlReference/Output/Strict/el_ul.html ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Re: [ZPT] Recursive structures
Nikko Wolf wrote: Ian Bicking wrote: I'm surprised this has never come up for me before, but now I want to render a recursive data structure and I'm at a loss how I might do that in ZPT. Or, what the best workaround would be. E.g.: ['a', 'b', ['c', ['d', 'e']]] Becomes: ul lia/li lib/li ul lic/li ul lid/li lie/li /ul /ul /ul I've made recursive macros before. It's not so different from other recursion techniques. Here's one to render a site tree:: html head title tal:content=template/titleThe title/title /head body Site structure: tal:contain define=location nocall:here div metal:use-macro=template/macros/list / /tal:contain /body /html tal:hidemacro replace=nothing metal:recurse define-macro=list ul li tal:repeat=elt location/objectValues span tal:content=elt/getIdobjectId/span metal:block tal:condition=elt/isPrincipiaFolderish tal:define=location nocall:elt div metal:use-macro=template/macros/list / /metal:recurse /li /ul /metal:recurse /tal:hidemacro It will go from 'context', of course, unless you were to change the definition of 'location' in the page. You can imagine how this would work with a nested list: you just have to have ways of checking containership and getting contents. --jcc -- Building Websites with Plone http://plonebook.packtpub.com/ Enfold Systems, LLC http://www.enfoldsystems.com ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
