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Simpler definition of ZPT macros.

Project description

This package provides an adapter and a TALES expression for a more explicit and more flexible macro handling using the adapter registry for macros.

Detailed Documentation

Macro

This package provides a adapter and a TALES expression for a expliciter and flexibler macro handling using the adapter registry for macros.

We start with creating a content object that is used as a view context later:

>>> import zope.interface
>>> import zope.component
>>> from zope.publisher.interfaces.browser import IBrowserView
>>> from zope.publisher.interfaces.browser import IDefaultBrowserLayer
>>> class Content(object):
...     zope.interface.implements(zope.interface.Interface)
>>> content = Content()

We also create a temp dir for sample templates which we define later for testing:

>>> import os, tempfile
>>> temp_dir = tempfile.mkdtemp()

Macro Template

We define a macro template as a adapter providing IMacroTemplate:

>>> path = os.path.join(temp_dir, 'navigation.pt')
>>> open(path, 'w').write('''
... <metal:block define-macro="navigation">
...   <div tal:content="title">---</div>
... </metal:block>
... ''')

Let’s define the macro factory

>>> from z3c.macro import interfaces
>>> from z3c.macro import zcml
>>> navigationMacro = zcml.MacroFactory(path, 'navigation', 'text/html')

and register them as adapter:

>>> zope.component.provideAdapter(
...     navigationMacro,
...     (zope.interface.Interface, IBrowserView, IDefaultBrowserLayer),
...     interfaces.IMacroTemplate,
...     name='navigation')

The TALES macro Expression

The macro expression will look up the name of the macro, call a adapter providing IMacroTemplate and uses them or fills a slot if defined in the macro expression.

Let’s create a page template using the navigation macros:

>>> path = os.path.join(temp_dir, 'first.pt')
>>> open(path, 'w').write('''
... <html>
...   <body>
...     <h1>First Page</h1>
...     <div class="navi">
...       <tal:block define="title string:My Navigation">
...         <metal:block use-macro="macro:navigation" />
...       </tal:block>
...     </div>
...     <div class="content">
...       Content here
...     </div>
...   </body>
... </html>
... ''')

As you can see, we used the macro expression to simply look up a macro called navigation whihc get inserted and replaces the HTML content at this place.

Let’s now create a view using this page template:

>>> from zope.publisher.browser import BrowserView
>>> class simple(BrowserView):
...     def __getitem__(self, name):
...         return self.index.macros[name]
...
...     def __call__(self, **kwargs):
...         return self.index(**kwargs)
>>> from z3c.ptcompat import ViewPageTemplateFile
>>> def SimpleViewClass(path, name=u''):
...     return type(
...         "SimpleViewClass", (simple,),
...         {'index': ViewPageTemplateFile(path), '__name__': name})
>>> FirstPage = SimpleViewClass(path, name='first.html')
>>> zope.component.provideAdapter(
...     FirstPage,
...     (zope.interface.Interface, IDefaultBrowserLayer),
...     zope.interface.Interface,
...     name='first.html')

Finally we look up the view and render it:

>>> from zope.publisher.browser import TestRequest
>>> request = TestRequest()
>>> view = zope.component.getMultiAdapter((content, request),
...                                       name='first.html')
>>> print view().strip()
<html>
  <body>
    <h1>First Page</h1>
    <div class="navi">
      <div>My Navigation</div>
    </div>
    <div class="content">
      Content here
    </div>
  </body>
</html>

Slot

We can also define a macro slot and fill it with given content:

>>> path = os.path.join(temp_dir, 'addons.pt')
>>> open(path, 'w').write('''
... <metal:block define-macro="addons">
...   Content before header
...   <metal:block define-slot="header">
...     <div>My Header</div>
...   </metal:block>
...   Content after header
... </metal:block>
... ''')

Let’s define the macro factory

>>> addonsMacro = zcml.MacroFactory(path, 'addons', 'text/html')

and register them as adapter:

>>> zope.component.provideAdapter(
...     addonsMacro,
...     (zope.interface.Interface, IBrowserView, IDefaultBrowserLayer),
...     interfaces.IMacroTemplate,
...     name='addons')

Let’s create a page template using the addons macros:

>>> path = os.path.join(temp_dir, 'second.pt')
>>> open(path, 'w').write('''
... <html>
...   <body>
...     <h1>Second Page</h1>
...     <div class="header">
...       <metal:block use-macro="macro:addons">
...         This line get ignored
...         <metal:block fill-slot="header">
...           Header comes from here
...         </metal:block>
...         This line get ignored
...       </metal:block>
...     </div>
...   </body>
... </html>
... ''')

Let’s now create a view using this page template:

>>> SecondPage = SimpleViewClass(path, name='second.html')
>>> zope.component.provideAdapter(
...     SecondPage,
...     (zope.interface.Interface, IDefaultBrowserLayer),
...     zope.interface.Interface,
...     name='second.html')

Finally we look up the view and render it:

>>> view = zope.component.getMultiAdapter((content, request),
...                                       name='second.html')
>>> print view().strip()
<html>
  <body>
    <h1>Second Page</h1>
    <div class="header">
<BLANKLINE>
  Content before header
<BLANKLINE>
          Header comes from here
<BLANKLINE>
  Content after header
    </div>
  </body>
</html>

Cleanup

>>> import shutil
>>> shutil.rmtree(temp_dir)

macro directive

A macro directive can be used for register macros. Take a look at the README.txt which explains the macro TALES expression.

>>> import sys
>>> from zope.configuration import xmlconfig
>>> import z3c.template
>>> context = xmlconfig.file('meta.zcml', z3c.macro)

First define a template which defines a macro:

>>> import os, tempfile
>>> temp_dir = tempfile.mkdtemp()
>>> file = os.path.join(temp_dir, 'file.pt')
>>> open(file, 'w').write('''
... <html>
...   <head>
...     <metal:block define-macro="title">
...        <title>Pagelet skin</title>
...     </metal:block>
...   </head>
...   <body>
...     <div>content</div>
...   </body>
... </html>
... ''')

and register the macro provider within the z3c:macroProvider directive:

>>> context = xmlconfig.string("""
... <configure
...     xmlns:z3c="http://namespaces.zope.org/z3c">
...   <z3c:macro
...       template="%s"
...       name="title"
...       />
... </configure>
... """ % file, context=context)

We need a content object…

>>> import zope.interface
>>> class Content(object):
...     zope.interface.implements(zope.interface.Interface)
>>> content = Content()

and we need a view…

>>> import zope.interface
>>> import zope.component
>>> from zope.publisher.browser import BrowserPage
>>> class View(BrowserPage):
...     def __init__(self, context, request):
...         self.context = context
...         self.request = request
and we need a request:
>>> from zope.publisher.browser import TestRequest
>>> request = TestRequest()

Check if we get the macro template:

>>> from z3c.macro import interfaces
>>> view = View(content, request)
>>> macro = zope.component.queryMultiAdapter((content, view, request),
...     interface=interfaces.IMacroTemplate, name='title')
>>> macro is not None
True
>>> import os, tempfile
>>> temp_dir = tempfile.mkdtemp()
>>> file = os.path.join(temp_dir, 'test.pt')
>>> open(file, 'w').write('''
... <html>
...   <body>
...     <metal:macro use-macro="options/macro" />
...   </body>
... </html>
... ''')
>>> from z3c.ptcompat import ViewPageTemplateFile, bind_template
>>> template = ViewPageTemplateFile(file)
>>> print bind_template(template, view)(macro=macro)
<html>
  <body>
    <title>Pagelet skin</title>
  </body>
</html>

CHANGES

1.2.0 (2009-03-07)

  • Allow use of z3c.pt using z3c.ptcompat compatibility layer.

  • Change package’s mailing list address to zope-dev at zope.org.

1.1.0 (2007-11-01)

  • Update package info data.

  • Add z3c namespace package declaration.

1.0.0 (2007-09-30)

  • Initial release.

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