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"TurboGears support for Zope Page Templates"
import StringIO
import logging
import pkg_resources
#from zope.pagetemplate.pagetemplatefile import PageTemplateFile
from simpletal import simpleTAL, simpleTALES
log = logging.getLogger("turbogears.zptsupport")
_zpt_cache = {}
def zpt(tfile):
tinstance = _zpt_cache.get(tfile)
if tinstance is None:
tinstance = _zpt_cache[tfile] = TemplateWrapper(
simpleTAL.compileXMLTemplate(open(tfile)), tfile)
return tinstance
class TemplateWrapper(object):
def __init__(self, template, filename):
self.template = template
self.filename = filename
def expand(self, **info):
context = simpleTALES.Context(allowPythonPath=1)
for k, v in info.iteritems():
context.addGlobal(k, v)
s = StringIO.StringIO()
self.template.expandInline(context, s)
return s.getvalue()
@property
def macros(self):
return self.template.macros
## class TGPageTemplateFile(PageTemplateFile):
## def pt_getContext(self, args=(), options={}, **ignored):
## namespace = super(TGPageTemplateFile, self).pt_getContext(
## args, options, **ignored)
## namespace.update(options)
## return namespace
class TurboZpt(object):
extension = "pt"
def __init__(self, extra_vars_func=None):
self.get_extra_vars = extra_vars_func
def load_template(self, classname, loadingSite=False):
"""Searches for a template along the Python path.
Template files must end in ".pt" and be in legitimate packages.
Templates are automatically checked for changes and reloaded as
neccessary.
"""
divider = classname.rfind(".")
if divider > -1:
package = classname[0:divider]
basename = classname[divider+1:]
else:
raise ValueError, "All templates must be in a package"
tfile = pkg_resources.resource_filename(
package, "%s.%s" % (basename, self.extension))
return zpt(tfile)
def render(self, info, format="html", fragment=False, template=None):
"""Renders data in the desired format.
@param info: the data / context itself
@type info: dict
@para format: "html"
@type format: "string"
@para template: name of the template to use
@type template: string
"""
tinstance = self.load_template(template)
log.debug("Applying template %s" % (tinstance.filename))
data = dict()
if self.get_extra_vars:
data.update(self.get_extra_vars())
data.update(info)
return tinstance.expand(**data).encode('utf-8')
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