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import os
import pkg_resources
from zope.component import getSiteManager
from zope.component import queryUtility
from repoze.bfg.interfaces import IRendererFactory
from repoze.bfg.interfaces import ITemplateRenderer
from repoze.bfg.path import caller_package
from repoze.bfg.resource import resource_spec
from repoze.bfg.settings import get_settings
try:
import json
except ImportError:
import simplejson as json
# concrete renderer factory implementations
def json_renderer_factory(name):
def _render(value, system):
return json.dumps(value)
return _render
def string_renderer_factory(name):
def _render(value, system):
if not isinstance(value, basestring):
value = str(value)
return value
return _render
# utility functions
def template_renderer_factory(path, impl, level=3):
if os.path.isabs(path):
# 'path' is an absolute filename (not common and largely only
# for backwards compatibility)
if not os.path.exists(path):
raise ValueError('Missing template file: %s' % path)
renderer = queryUtility(ITemplateRenderer, name=path)
if renderer is None:
renderer = impl(path)
sm = getSiteManager()
sm.registerUtility(renderer, ITemplateRenderer, name=path)
else:
# 'path' is a relative filename or a package:relpath spec
spec = resource_spec(path, caller_package(level=level).__name__)
renderer = queryUtility(ITemplateRenderer, name=spec)
if renderer is None:
# service unit tests by trying the relative path string as
# the utility name directly
renderer = queryUtility(ITemplateRenderer, name=path)
if renderer is None:
pkg, path = spec.split(':', 1)
if not pkg_resources.resource_exists(pkg, path):
raise ValueError('Missing template resource: %s' % spec)
abspath = pkg_resources.resource_filename(pkg, path)
renderer = impl(abspath)
if not _reload_resources():
# cache the template
sm = getSiteManager()
sm.registerUtility(renderer, ITemplateRenderer,
name=spec)
return renderer
def renderer_from_name(path):
name = os.path.splitext(path)[1]
if not name:
name = path
factory = queryUtility(IRendererFactory, name=name)
if factory is None:
raise ValueError('No renderer for renderer name %r' % name)
return factory(path)
def _reload_resources():
settings = get_settings()
return settings and settings.get('reload_resources')
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