471 lines
17 KiB
Python
471 lines
17 KiB
Python
# -*- coding: utf-8 -*-
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"""
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jinja2.loaders
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~~~~~~~~~~~~~~
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Jinja loader classes.
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:copyright: (c) 2010 by the Jinja Team.
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:license: BSD, see LICENSE for more details.
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"""
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import os
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import sys
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import weakref
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from types import ModuleType
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from os import path
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from hashlib import sha1
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from jinja2.exceptions import TemplateNotFound
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from jinja2.utils import open_if_exists, internalcode
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from jinja2._compat import string_types, iteritems
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def split_template_path(template):
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"""Split a path into segments and perform a sanity check. If it detects
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'..' in the path it will raise a `TemplateNotFound` error.
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"""
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pieces = []
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for piece in template.split('/'):
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if path.sep in piece \
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or (path.altsep and path.altsep in piece) or \
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piece == path.pardir:
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raise TemplateNotFound(template)
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elif piece and piece != '.':
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pieces.append(piece)
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return pieces
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class BaseLoader(object):
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"""Baseclass for all loaders. Subclass this and override `get_source` to
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implement a custom loading mechanism. The environment provides a
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`get_template` method that calls the loader's `load` method to get the
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:class:`Template` object.
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A very basic example for a loader that looks up templates on the file
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system could look like this::
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from jinja2 import BaseLoader, TemplateNotFound
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from os.path import join, exists, getmtime
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class MyLoader(BaseLoader):
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def __init__(self, path):
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self.path = path
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def get_source(self, environment, template):
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path = join(self.path, template)
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if not exists(path):
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raise TemplateNotFound(template)
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mtime = getmtime(path)
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with file(path) as f:
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source = f.read().decode('utf-8')
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return source, path, lambda: mtime == getmtime(path)
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"""
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#: if set to `False` it indicates that the loader cannot provide access
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#: to the source of templates.
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#:
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#: .. versionadded:: 2.4
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has_source_access = True
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def get_source(self, environment, template):
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"""Get the template source, filename and reload helper for a template.
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It's passed the environment and template name and has to return a
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tuple in the form ``(source, filename, uptodate)`` or raise a
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`TemplateNotFound` error if it can't locate the template.
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The source part of the returned tuple must be the source of the
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template as unicode string or a ASCII bytestring. The filename should
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be the name of the file on the filesystem if it was loaded from there,
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otherwise `None`. The filename is used by python for the tracebacks
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if no loader extension is used.
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The last item in the tuple is the `uptodate` function. If auto
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reloading is enabled it's always called to check if the template
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changed. No arguments are passed so the function must store the
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old state somewhere (for example in a closure). If it returns `False`
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the template will be reloaded.
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"""
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if not self.has_source_access:
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raise RuntimeError('%s cannot provide access to the source' %
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self.__class__.__name__)
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raise TemplateNotFound(template)
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def list_templates(self):
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"""Iterates over all templates. If the loader does not support that
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it should raise a :exc:`TypeError` which is the default behavior.
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"""
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raise TypeError('this loader cannot iterate over all templates')
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@internalcode
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def load(self, environment, name, globals=None):
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"""Loads a template. This method looks up the template in the cache
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or loads one by calling :meth:`get_source`. Subclasses should not
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override this method as loaders working on collections of other
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loaders (such as :class:`PrefixLoader` or :class:`ChoiceLoader`)
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will not call this method but `get_source` directly.
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"""
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code = None
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if globals is None:
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globals = {}
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# first we try to get the source for this template together
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# with the filename and the uptodate function.
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source, filename, uptodate = self.get_source(environment, name)
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# try to load the code from the bytecode cache if there is a
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# bytecode cache configured.
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bcc = environment.bytecode_cache
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if bcc is not None:
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bucket = bcc.get_bucket(environment, name, filename, source)
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code = bucket.code
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# if we don't have code so far (not cached, no longer up to
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# date) etc. we compile the template
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if code is None:
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code = environment.compile(source, name, filename)
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# if the bytecode cache is available and the bucket doesn't
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# have a code so far, we give the bucket the new code and put
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# it back to the bytecode cache.
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if bcc is not None and bucket.code is None:
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bucket.code = code
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bcc.set_bucket(bucket)
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return environment.template_class.from_code(environment, code,
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globals, uptodate)
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class FileSystemLoader(BaseLoader):
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"""Loads templates from the file system. This loader can find templates
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in folders on the file system and is the preferred way to load them.
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The loader takes the path to the templates as string, or if multiple
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locations are wanted a list of them which is then looked up in the
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given order:
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>>> loader = FileSystemLoader('/path/to/templates')
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>>> loader = FileSystemLoader(['/path/to/templates', '/other/path'])
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Per default the template encoding is ``'utf-8'`` which can be changed
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by setting the `encoding` parameter to something else.
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"""
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def __init__(self, searchpath, encoding='utf-8'):
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if isinstance(searchpath, string_types):
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searchpath = [searchpath]
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self.searchpath = list(searchpath)
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self.encoding = encoding
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def get_source(self, environment, template):
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pieces = split_template_path(template)
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for searchpath in self.searchpath:
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filename = path.join(searchpath, *pieces)
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f = open_if_exists(filename)
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if f is None:
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continue
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try:
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contents = f.read().decode(self.encoding)
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finally:
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f.close()
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mtime = path.getmtime(filename)
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def uptodate():
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try:
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return path.getmtime(filename) == mtime
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except OSError:
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return False
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return contents, filename, uptodate
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raise TemplateNotFound(template)
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def list_templates(self):
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found = set()
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for searchpath in self.searchpath:
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for dirpath, dirnames, filenames in os.walk(searchpath):
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for filename in filenames:
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template = os.path.join(dirpath, filename) \
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[len(searchpath):].strip(os.path.sep) \
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.replace(os.path.sep, '/')
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if template[:2] == './':
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template = template[2:]
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if template not in found:
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found.add(template)
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return sorted(found)
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class PackageLoader(BaseLoader):
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"""Load templates from python eggs or packages. It is constructed with
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the name of the python package and the path to the templates in that
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package::
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loader = PackageLoader('mypackage', 'views')
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If the package path is not given, ``'templates'`` is assumed.
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Per default the template encoding is ``'utf-8'`` which can be changed
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by setting the `encoding` parameter to something else. Due to the nature
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of eggs it's only possible to reload templates if the package was loaded
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from the file system and not a zip file.
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"""
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def __init__(self, package_name, package_path='templates',
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encoding='utf-8'):
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from pkg_resources import DefaultProvider, ResourceManager, \
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get_provider
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provider = get_provider(package_name)
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self.encoding = encoding
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self.manager = ResourceManager()
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self.filesystem_bound = isinstance(provider, DefaultProvider)
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self.provider = provider
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self.package_path = package_path
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def get_source(self, environment, template):
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pieces = split_template_path(template)
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p = '/'.join((self.package_path,) + tuple(pieces))
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if not self.provider.has_resource(p):
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raise TemplateNotFound(template)
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filename = uptodate = None
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if self.filesystem_bound:
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filename = self.provider.get_resource_filename(self.manager, p)
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mtime = path.getmtime(filename)
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def uptodate():
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try:
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return path.getmtime(filename) == mtime
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except OSError:
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return False
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source = self.provider.get_resource_string(self.manager, p)
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return source.decode(self.encoding), filename, uptodate
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def list_templates(self):
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path = self.package_path
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if path[:2] == './':
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path = path[2:]
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elif path == '.':
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path = ''
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offset = len(path)
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results = []
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def _walk(path):
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for filename in self.provider.resource_listdir(path):
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fullname = path + '/' + filename
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if self.provider.resource_isdir(fullname):
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_walk(fullname)
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else:
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results.append(fullname[offset:].lstrip('/'))
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_walk(path)
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results.sort()
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return results
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class DictLoader(BaseLoader):
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"""Loads a template from a python dict. It's passed a dict of unicode
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strings bound to template names. This loader is useful for unittesting:
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>>> loader = DictLoader({'index.html': 'source here'})
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Because auto reloading is rarely useful this is disabled per default.
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"""
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def __init__(self, mapping):
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self.mapping = mapping
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def get_source(self, environment, template):
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if template in self.mapping:
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source = self.mapping[template]
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return source, None, lambda: source == self.mapping.get(template)
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raise TemplateNotFound(template)
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def list_templates(self):
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return sorted(self.mapping)
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class FunctionLoader(BaseLoader):
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"""A loader that is passed a function which does the loading. The
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function becomes the name of the template passed and has to return either
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an unicode string with the template source, a tuple in the form ``(source,
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filename, uptodatefunc)`` or `None` if the template does not exist.
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>>> def load_template(name):
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... if name == 'index.html':
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... return '...'
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...
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>>> loader = FunctionLoader(load_template)
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The `uptodatefunc` is a function that is called if autoreload is enabled
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and has to return `True` if the template is still up to date. For more
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details have a look at :meth:`BaseLoader.get_source` which has the same
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return value.
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"""
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def __init__(self, load_func):
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self.load_func = load_func
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def get_source(self, environment, template):
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rv = self.load_func(template)
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if rv is None:
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raise TemplateNotFound(template)
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elif isinstance(rv, string_types):
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return rv, None, None
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return rv
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class PrefixLoader(BaseLoader):
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"""A loader that is passed a dict of loaders where each loader is bound
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to a prefix. The prefix is delimited from the template by a slash per
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default, which can be changed by setting the `delimiter` argument to
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something else::
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loader = PrefixLoader({
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'app1': PackageLoader('mypackage.app1'),
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'app2': PackageLoader('mypackage.app2')
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})
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By loading ``'app1/index.html'`` the file from the app1 package is loaded,
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by loading ``'app2/index.html'`` the file from the second.
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"""
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def __init__(self, mapping, delimiter='/'):
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self.mapping = mapping
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self.delimiter = delimiter
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def get_loader(self, template):
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try:
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prefix, name = template.split(self.delimiter, 1)
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loader = self.mapping[prefix]
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except (ValueError, KeyError):
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raise TemplateNotFound(template)
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return loader, name
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def get_source(self, environment, template):
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loader, name = self.get_loader(template)
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try:
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return loader.get_source(environment, name)
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except TemplateNotFound:
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# re-raise the exception with the correct fileame here.
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# (the one that includes the prefix)
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raise TemplateNotFound(template)
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@internalcode
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def load(self, environment, name, globals=None):
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loader, local_name = self.get_loader(name)
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try:
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return loader.load(environment, local_name, globals)
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except TemplateNotFound:
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# re-raise the exception with the correct fileame here.
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# (the one that includes the prefix)
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raise TemplateNotFound(name)
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def list_templates(self):
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result = []
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for prefix, loader in iteritems(self.mapping):
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for template in loader.list_templates():
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result.append(prefix + self.delimiter + template)
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return result
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class ChoiceLoader(BaseLoader):
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"""This loader works like the `PrefixLoader` just that no prefix is
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specified. If a template could not be found by one loader the next one
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is tried.
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>>> loader = ChoiceLoader([
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... FileSystemLoader('/path/to/user/templates'),
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... FileSystemLoader('/path/to/system/templates')
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... ])
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This is useful if you want to allow users to override builtin templates
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from a different location.
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"""
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def __init__(self, loaders):
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self.loaders = loaders
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def get_source(self, environment, template):
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for loader in self.loaders:
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try:
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return loader.get_source(environment, template)
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except TemplateNotFound:
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pass
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raise TemplateNotFound(template)
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@internalcode
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def load(self, environment, name, globals=None):
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for loader in self.loaders:
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try:
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return loader.load(environment, name, globals)
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except TemplateNotFound:
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pass
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raise TemplateNotFound(name)
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def list_templates(self):
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found = set()
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for loader in self.loaders:
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found.update(loader.list_templates())
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return sorted(found)
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class _TemplateModule(ModuleType):
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"""Like a normal module but with support for weak references"""
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class ModuleLoader(BaseLoader):
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"""This loader loads templates from precompiled templates.
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Example usage:
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>>> loader = ChoiceLoader([
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... ModuleLoader('/path/to/compiled/templates'),
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... FileSystemLoader('/path/to/templates')
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... ])
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Templates can be precompiled with :meth:`Environment.compile_templates`.
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"""
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has_source_access = False
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def __init__(self, path):
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package_name = '_jinja2_module_templates_%x' % id(self)
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# create a fake module that looks for the templates in the
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# path given.
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mod = _TemplateModule(package_name)
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if isinstance(path, string_types):
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path = [path]
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else:
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path = list(path)
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mod.__path__ = path
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sys.modules[package_name] = weakref.proxy(mod,
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lambda x: sys.modules.pop(package_name, None))
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# the only strong reference, the sys.modules entry is weak
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# so that the garbage collector can remove it once the
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# loader that created it goes out of business.
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self.module = mod
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self.package_name = package_name
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@staticmethod
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def get_template_key(name):
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return 'tmpl_' + sha1(name.encode('utf-8')).hexdigest()
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@staticmethod
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def get_module_filename(name):
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return ModuleLoader.get_template_key(name) + '.py'
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@internalcode
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def load(self, environment, name, globals=None):
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key = self.get_template_key(name)
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module = '%s.%s' % (self.package_name, key)
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mod = getattr(self.module, module, None)
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if mod is None:
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try:
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mod = __import__(module, None, None, ['root'])
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except ImportError:
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raise TemplateNotFound(name)
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# remove the entry from sys.modules, we only want the attribute
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# on the module object we have stored on the loader.
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sys.modules.pop(module, None)
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return environment.template_class.from_module_dict(
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environment, mod.__dict__, globals)
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