X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/fb8a270fa22abc217efc471d860c76d5a2352c61..d8d6976f3a0646a05e052d33294e3c8c44c5eed3:/philo/models/pages.py diff --git a/philo/models/pages.py b/philo/models/pages.py index 2221ee4..0ce047e 100644 --- a/philo/models/pages.py +++ b/philo/models/pages.py @@ -1,27 +1,38 @@ # 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.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.templatetags.containers import ContainerNode from philo.utils import fattr from philo.validators import LOADED_TEMPLATE_ATTR -from philo.signals import page_about_to_render_to_string, page_finished_rendering_to_string + + +__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 @@ -38,7 +49,7 @@ class LazyContainerFinder(object): 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 @@ -69,51 +80,55 @@ class LazyContainerFinder(object): self.initialized = True +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(TreeModel): + """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: @@ -124,12 +139,13 @@ class Template(TreeModel): 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: @@ -138,18 +154,31 @@ class Template(TreeModel): 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}) @@ -165,12 +194,18 @@ class Page(View): 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 = [] @@ -196,11 +231,16 @@ class Page(View): 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: @@ -208,21 +248,23 @@ class Contentlet(models.Model): 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