# encoding: utf-8
+"""
+:class:`Page`\ s are the most frequently used :class:`.View` subclass. They define a basic HTML page and its associated content. Each :class:`Page` renders itself according to a :class:`Template`. The :class:`Template` may contain :ttag:`container` tags, which define related :class:`Contentlet`\ s and :class:`ContentReference`\ s for any page using that :class:`Template`.
+
+"""
+
+import itertools
+
from django.conf import settings
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes import generic
from django.core.exceptions import ValidationError
from django.db import models
from django.http import HttpResponse
-from django.template import TemplateDoesNotExist, Context, RequestContext, Template as DjangoTemplate, add_to_builtins as register_templatetags, TextNode, VariableNode
+from django.template import TemplateDoesNotExist, Context, RequestContext, Template as DjangoTemplate, TextNode, VariableNode
from django.template.loader_tags import BlockNode, ExtendsNode, BlockContext
from django.utils.datastructures import SortedDict
-from philo.models.base import TreeModel, register_value_model
+from philo.models.base import SlugTreeEntity, register_value_model
from philo.models.fields import TemplateField
from philo.models.nodes import View
from philo.signals import page_about_to_render_to_string, page_finished_rendering_to_string
from philo.validators import LOADED_TEMPLATE_ATTR
+__all__ = ('Template', 'Page', 'Contentlet', 'ContentReference')
+
+
class LazyContainerFinder(object):
def __init__(self, nodes, extends=False):
self.nodes = nodes
self.initialized = False
- self.contentlet_specs = set()
+ self.contentlet_specs = []
self.contentreference_specs = SortedDict()
self.blocks = {}
self.block_super = False
if isinstance(node, ContainerNode):
if not node.references:
- self.contentlet_specs.add(node.name)
+ self.contentlet_specs.append(node.name)
else:
if node.name not in self.contentreference_specs.keys():
self.contentreference_specs[node.name] = node.references
self.initialized = True
-class Template(TreeModel):
+def build_extension_tree(nodelist):
+ nodelists = []
+ extends = None
+ for node in nodelist:
+ if not isinstance(node, TextNode):
+ if isinstance(node, ExtendsNode):
+ extends = node
+ break
+
+ if extends:
+ if extends.nodelist:
+ nodelists.append(LazyContainerFinder(extends.nodelist, extends=True))
+ loaded_template = getattr(extends, LOADED_TEMPLATE_ATTR)
+ nodelists.extend(build_extension_tree(loaded_template.nodelist))
+ else:
+ # Base case: root.
+ nodelists.append(LazyContainerFinder(nodelist))
+ return nodelists
+
+
+class Template(SlugTreeEntity):
+ """Represents a database-driven django template."""
+ #: The name of the template. Used for organization and debugging.
name = models.CharField(max_length=255)
+ #: Can be used to let users know what the template is meant to be used for.
documentation = models.TextField(null=True, blank=True)
+ #: Defines the mimetype of the template. This is not validated. Default: ``text/html``.
mimetype = models.CharField(max_length=255, default=getattr(settings, 'DEFAULT_CONTENT_TYPE', 'text/html'))
+ #: An insecure :class:`~philo.models.fields.TemplateField` containing the django template code for this template.
code = TemplateField(secure=False, verbose_name='django template code')
@property
def containers(self):
"""
- Returns a tuple where the first item is a list of names of contentlets referenced by containers,
- and the second item is a list of tuples of names and contenttypes of contentreferences referenced by containers.
- This will break if there is a recursive extends or includes in the template code.
- Due to the use of an empty Context, any extends or include tags with dynamic arguments probably won't work.
+ Returns a tuple where the first item is a list of names of contentlets referenced by containers, and the second item is a list of tuples of names and contenttypes of contentreferences referenced by containers. This will break if there is a recursive extends or includes in the template code. Due to the use of an empty Context, any extends or include tags with dynamic arguments probably won't work.
+
"""
template = DjangoTemplate(self.code)
- def build_extension_tree(nodelist):
- nodelists = []
- extends = None
- for node in nodelist:
- if not isinstance(node, TextNode):
- if isinstance(node, ExtendsNode):
- extends = node
- break
-
- if extends:
- if extends.nodelist:
- nodelists.append(LazyContainerFinder(extends.nodelist, extends=True))
- loaded_template = getattr(extends, LOADED_TEMPLATE_ATTR)
- nodelists.extend(build_extension_tree(loaded_template.nodelist))
- else:
- # Base case: root.
- nodelists.append(LazyContainerFinder(nodelist))
- return nodelists
-
# Build a tree of the templates we're using, placing the root template first.
- levels = build_extension_tree(template.nodelist)[::-1]
+ levels = build_extension_tree(template.nodelist)
- contentlet_specs = set()
+ contentlet_specs = []
contentreference_specs = SortedDict()
blocks = {}
- for level in levels:
+ for level in reversed(levels):
level.initialize()
- contentlet_specs |= level.contentlet_specs
+ contentlet_specs.extend(itertools.ifilter(lambda x: x not in contentlet_specs, level.contentlet_specs))
contentreference_specs.update(level.contentreference_specs)
for name, block in level.blocks.items():
if block.block_super:
for block_list in blocks.values():
for block in block_list:
block.initialize()
- contentlet_specs |= block.contentlet_specs
+ contentlet_specs.extend(itertools.ifilter(lambda x: x not in contentlet_specs, block.contentlet_specs))
contentreference_specs.update(block.contentreference_specs)
return contentlet_specs, contentreference_specs
def __unicode__(self):
+ """Returns the value of the :attr:`name` field."""
return self.name
- class Meta:
+ class Meta(SlugTreeEntity.Meta):
app_label = 'philo'
class Page(View):
"""
- Represents a page - something which is rendered according to a template. The page will have a number of related Contentlets depending on the template selected - but these will appear only after the page has been saved with that template.
+ Represents a page - something which is rendered according to a :class:`Template`. The page will have a number of related :class:`Contentlet`\ s and :class:`ContentReference`\ s depending on the template selected - but these will appear only after the page has been saved with that template.
+
"""
+ #: A :class:`ForeignKey` to the :class:`Template` used to render this :class:`Page`.
template = models.ForeignKey(Template, related_name='pages')
+ #: The name of this page. Chances are this will be used for organization - i.e. finding the page in a list of pages - rather than for display.
title = models.CharField(max_length=255)
def get_containers(self):
+ """
+ Returns the results :attr:`~Template.containers` for the related template. This is a tuple containing the specs of all :ttag:`container`\ s in the :class:`Template`'s code. The value will be cached on the instance so that multiple accesses will be less expensive.
+
+ """
if not hasattr(self, '_containers'):
self._containers = self.template.containers
return self._containers
containers = property(get_containers)
def render_to_string(self, request=None, extra_context=None):
+ """
+ In addition to rendering as an :class:`HttpResponse`, a :class:`Page` can also render as a string. This means, for example, that :class:`Page`\ s can be used to render emails or other non-HTML content with the same :ttag:`container`-based functionality as is used for HTML.
+
+ The :class:`Page` will add itself to the context as ``page`` and its :attr:`~.Entity.attributes` as ``attributes``. If a request is provided, then :class:`request.node <.Node>` will also be added to the context as ``node`` and ``attributes`` will be set to the result of calling :meth:`~.View.attributes_with_node` with that :class:`.Node`.
+
+ """
context = {}
context.update(extra_context or {})
context.update({'page': self, 'attributes': self.attributes})
return string
def actually_render_to_response(self, request, extra_context=None):
+ """Returns an :class:`HttpResponse` with the content of the :meth:`render_to_string` method and the mimetype set to the :attr:`~Template.mimetype` of the related :class:`Template`."""
return HttpResponse(self.render_to_string(request, extra_context), mimetype=self.template.mimetype)
def __unicode__(self):
+ """Returns the value of :attr:`title`"""
return self.title
def clean_fields(self, exclude=None):
+ """
+ This is an override of the default model clean_fields method. Essentially, in addition to validating the fields, this method validates the :class:`Template` instance that is used to render this :class:`Page`. This is useful for catching template errors before they show up as 500 errors on a live site.
+
+ """
if exclude is None:
exclude = []
class Contentlet(models.Model):
+ """Represents a piece of content on a page. This content is treated as a secure :class:`~philo.models.fields.TemplateField`."""
+ #: The page which this :class:`Contentlet` is related to.
page = models.ForeignKey(Page, related_name='contentlets')
+ #: This represents the name of the container as defined by a :ttag:`container` tag.
name = models.CharField(max_length=255, db_index=True)
+ #: A secure :class:`~philo.models.fields.TemplateField` holding the content for this :class:`Contentlet`. Note that actually using this field as a template requires use of the :ttag:`include_string` template tag.
content = TemplateField()
def __unicode__(self):
+ """Returns the value of the :attr:`name` field."""
return self.name
class Meta:
class ContentReference(models.Model):
+ """Represents a model instance related to a page."""
+ #: The page which this :class:`ContentReference` is related to.
page = models.ForeignKey(Page, related_name='contentreferences')
+ #: This represents the name of the container as defined by a :ttag:`container` tag.
name = models.CharField(max_length=255, db_index=True)
content_type = models.ForeignKey(ContentType, verbose_name='Content type')
content_id = models.PositiveIntegerField(verbose_name='Content ID', blank=True, null=True)
+ #: A :class:`GenericForeignKey` to a model instance. The content type of this instance is defined by the :ttag:`container` tag which defines this :class:`ContentReference`.
content = generic.GenericForeignKey('content_type', 'content_id')
def __unicode__(self):
+ """Returns the value of the :attr:`name` field."""
return self.name
class Meta:
app_label = 'philo'
-register_templatetags('philo.templatetags.containers')
-
-
register_value_model(Template)
register_value_model(Page)
\ No newline at end of file
git.ithinksw.org / philo.git / blobdiff