author | Sverre Rabbelier <srabbelier@gmail.com> |
Sun, 15 Feb 2009 16:11:23 +0000 | |
changeset 1347 | 88dac688b673 |
parent 54 | 03e267d67478 |
permissions | -rw-r--r-- |
54
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# Wrapper for loading templates from storage of some sort (e.g. filesystem, database). |
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# |
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# This uses the TEMPLATE_LOADERS setting, which is a list of loaders to use. |
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# Each loader is expected to have this interface: |
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# |
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# callable(name, dirs=[]) |
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# |
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# name is the template name. |
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# dirs is an optional list of directories to search instead of TEMPLATE_DIRS. |
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# |
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# The loader should return a tuple of (template_source, path). The path returned |
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# might be shown to the user for debugging purposes, so it should identify where |
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# the template was loaded from. |
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# |
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# Each loader should have an "is_usable" attribute set. This is a boolean that |
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# specifies whether the loader can be used in this Python installation. Each |
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# loader is responsible for setting this when it's initialized. |
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# |
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# For example, the eggs loader (which is capable of loading templates from |
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# Python eggs) sets is_usable to False if the "pkg_resources" module isn't |
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# installed, because pkg_resources is necessary to read eggs. |
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|
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from django.core.exceptions import ImproperlyConfigured |
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from django.template import Origin, Template, Context, TemplateDoesNotExist, add_to_builtins |
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from django.conf import settings |
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|
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template_source_loaders = None |
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|
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class LoaderOrigin(Origin): |
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def __init__(self, display_name, loader, name, dirs): |
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super(LoaderOrigin, self).__init__(display_name) |
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self.loader, self.loadname, self.dirs = loader, name, dirs |
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|
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def reload(self): |
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return self.loader(self.loadname, self.dirs)[0] |
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|
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def make_origin(display_name, loader, name, dirs): |
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if settings.TEMPLATE_DEBUG: |
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return LoaderOrigin(display_name, loader, name, dirs) |
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else: |
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return None |
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|
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def find_template_source(name, dirs=None): |
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# Calculate template_source_loaders the first time the function is executed |
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# because putting this logic in the module-level namespace may cause |
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# circular import errors. See Django ticket #1292. |
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global template_source_loaders |
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if template_source_loaders is None: |
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loaders = [] |
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for path in settings.TEMPLATE_LOADERS: |
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i = path.rfind('.') |
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module, attr = path[:i], path[i+1:] |
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try: |
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mod = __import__(module, globals(), locals(), [attr]) |
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except ImportError, e: |
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raise ImproperlyConfigured, 'Error importing template source loader %s: "%s"' % (module, e) |
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try: |
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func = getattr(mod, attr) |
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except AttributeError: |
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raise ImproperlyConfigured, 'Module "%s" does not define a "%s" callable template source loader' % (module, attr) |
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if not func.is_usable: |
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import warnings |
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warnings.warn("Your TEMPLATE_LOADERS setting includes %r, but your Python installation doesn't support that type of template loading. Consider removing that line from TEMPLATE_LOADERS." % path) |
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else: |
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loaders.append(func) |
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template_source_loaders = tuple(loaders) |
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for loader in template_source_loaders: |
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try: |
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source, display_name = loader(name, dirs) |
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return (source, make_origin(display_name, loader, name, dirs)) |
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except TemplateDoesNotExist: |
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pass |
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raise TemplateDoesNotExist, name |
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|
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def get_template(template_name): |
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""" |
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Returns a compiled Template object for the given template name, |
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handling template inheritance recursively. |
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""" |
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source, origin = find_template_source(template_name) |
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template = get_template_from_string(source, origin, template_name) |
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return template |
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|
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def get_template_from_string(source, origin=None, name=None): |
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""" |
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Returns a compiled Template object for the given template code, |
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handling template inheritance recursively. |
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""" |
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return Template(source, origin, name) |
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90 |
|
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def render_to_string(template_name, dictionary=None, context_instance=None): |
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""" |
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Loads the given template_name and renders it with the given dictionary as |
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context. The template_name may be a string to load a single template using |
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get_template, or it may be a tuple to use select_template to find one of |
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the templates in the list. Returns a string. |
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""" |
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dictionary = dictionary or {} |
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if isinstance(template_name, (list, tuple)): |
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t = select_template(template_name) |
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101 |
else: |
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t = get_template(template_name) |
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if context_instance: |
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104 |
context_instance.update(dictionary) |
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105 |
else: |
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context_instance = Context(dictionary) |
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107 |
return t.render(context_instance) |
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108 |
|
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109 |
def select_template(template_name_list): |
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"Given a list of template names, returns the first that can be loaded." |
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111 |
for template_name in template_name_list: |
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112 |
try: |
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113 |
return get_template(template_name) |
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changeset
|
114 |
except TemplateDoesNotExist: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
115 |
continue |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
116 |
# If we get here, none of the templates could be loaded |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
117 |
raise TemplateDoesNotExist, ', '.join(template_name_list) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
118 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
119 |
add_to_builtins('django.template.loader_tags') |