130 lines
4.1 KiB
Python
130 lines
4.1 KiB
Python
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from importlib import import_module
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from pkgutil import walk_packages
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from django.apps import apps
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from django.conf import settings
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from django.template import TemplateDoesNotExist
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from django.template.context import make_context
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from django.template.engine import Engine
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from django.template.library import InvalidTemplateLibrary
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from .base import BaseEngine
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class DjangoTemplates(BaseEngine):
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app_dirname = 'templates'
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def __init__(self, params):
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params = params.copy()
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options = params.pop('OPTIONS').copy()
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options.setdefault('autoescape', True)
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options.setdefault('debug', settings.DEBUG)
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options.setdefault('file_charset', settings.FILE_CHARSET)
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libraries = options.get('libraries', {})
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options['libraries'] = self.get_templatetag_libraries(libraries)
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super().__init__(params)
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self.engine = Engine(self.dirs, self.app_dirs, **options)
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def from_string(self, template_code):
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return Template(self.engine.from_string(template_code), self)
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def get_template(self, template_name):
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try:
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return Template(self.engine.get_template(template_name), self)
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except TemplateDoesNotExist as exc:
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reraise(exc, self)
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def get_templatetag_libraries(self, custom_libraries):
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"""
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Return a collation of template tag libraries from installed
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applications and the supplied custom_libraries argument.
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"""
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libraries = get_installed_libraries()
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libraries.update(custom_libraries)
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return libraries
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class Template:
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def __init__(self, template, backend):
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self.template = template
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self.backend = backend
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@property
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def origin(self):
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return self.template.origin
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def render(self, context=None, request=None):
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context = make_context(context, request, autoescape=self.backend.engine.autoescape)
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try:
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return self.template.render(context)
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except TemplateDoesNotExist as exc:
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reraise(exc, self.backend)
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def copy_exception(exc, backend=None):
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"""
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Create a new TemplateDoesNotExist. Preserve its declared attributes and
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template debug data but discard __traceback__, __context__, and __cause__
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to make this object suitable for keeping around (in a cache, for example).
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"""
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backend = backend or exc.backend
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new = exc.__class__(*exc.args, tried=exc.tried, backend=backend, chain=exc.chain)
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if hasattr(exc, 'template_debug'):
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new.template_debug = exc.template_debug
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return new
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def reraise(exc, backend):
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"""
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Reraise TemplateDoesNotExist while maintaining template debug information.
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"""
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new = copy_exception(exc, backend)
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raise new from exc
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def get_installed_libraries():
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"""
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Return the built-in template tag libraries and those from installed
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applications. Libraries are stored in a dictionary where keys are the
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individual module names, not the full module paths. Example:
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django.templatetags.i18n is stored as i18n.
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"""
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libraries = {}
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candidates = ['django.templatetags']
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candidates.extend(
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'%s.templatetags' % app_config.name
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for app_config in apps.get_app_configs())
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for candidate in candidates:
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try:
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pkg = import_module(candidate)
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except ImportError:
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# No templatetags package defined. This is safe to ignore.
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continue
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if hasattr(pkg, '__path__'):
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for name in get_package_libraries(pkg):
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libraries[name[len(candidate) + 1:]] = name
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return libraries
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def get_package_libraries(pkg):
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"""
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Recursively yield template tag libraries defined in submodules of a
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package.
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"""
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for entry in walk_packages(pkg.__path__, pkg.__name__ + '.'):
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try:
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module = import_module(entry[1])
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except ImportError as e:
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raise InvalidTemplateLibrary(
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"Invalid template library specified. ImportError raised when "
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"trying to load '%s': %s" % (entry[1], e)
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)
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if hasattr(module, 'register'):
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yield entry[1]
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