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from django.contrib.contenttypes.generic import GenericForeignKey
from django.db import models
from django.db.models import signals
from django.contrib.contenttypes.models import ContentType
from django.utils.translation import ugettext_lazy as _
from django.utils.importlib import import_module
from djangomarkup.processors import ProcessorConfigurationError, ProcessorError
#class RichTextField(models.TextField):
# def __init__(self, syntax, *args, **kwargs):
# self.syntax = syntax
# super(RichTextField, self).__init__(*args, **kwargs)
#
# def formfield(self, **kwargs):
# from djangomarkup.fields import RichTextField as RichTextFormField
# kwargs.update({
# 'syntax' : self.syntax,
# 'field_name' : self.name,
#
# })
# return RichTextFormField(**kwargs)
class TextProcessor(models.Model):
"""
Text processors are used to convert user-inputted source text in given processor format
(i.e. Markdown, Czechtile, ...) and convert them into target format
(now XHTML is assumed)
"""
function = models.CharField(max_length=96, unique=True)
name = models.CharField(max_length=96, blank=True)
processor_options = models.CharField(max_length=255, blank=True)
def __unicode__(self):
return self.name
def get_function(self):
"""
Return function object for my function.
raise ProcessorConfigurationError when function could not be resolved.
"""
if not hasattr(self, '_function'):
try:
modname, funcname = self.function.rsplit('.', 1)
mod = import_module(modname)
self._function = getattr(mod, funcname)
except (ImportError, AttributeError, ValueError), err:
raise ProcessorConfigurationError(err)
return self._function
def convert(self, src_txt):
function = self.get_function()
try:
return unicode(function(src_txt))
except Exception, err:
raise ProcessorError(err)
class Meta:
verbose_name = (_('Text processor'))
verbose_name_plural = (_('Text processors'))
class SourceTextManager(models.Manager):
def delete_for_object(self, instance):
try:
pk = int(instance.pk)
except ValueError:
return
self.filter(
content_type=ContentType.objects.get_for_model(instance),
object_id=pk,
).delete()
def extract_from_instance(self, instance, processor, fields, content_type=None, force_save=False, force_create=False):
if not content_type:
content_type = ContentType.objects.get_for_model(instance)
dirty = False
for f in fields:
val = getattr(instance, f)
if not val:
continue
if force_create:
created = True
st = self.create(
content_type=content_type,
object_id=instance.pk,
field=f,
processor=processor,
content=val,
)
else:
st, created = self.get_or_create(
content_type=content_type,
object_id=instance.pk,
field=f,
defaults={
'processor': processor,
'content': val,
}
)
if created:
setattr(instance, f, st.render())
dirty = True
if dirty or force_save:
instance.__class__.objects.filter(pk=instance.pk).update(
**dict( (f, getattr(instance, f)) for f in fields )
)
def extract_from_model(self, model, processor, fields):
if not fields:
return
ct = ContentType.objects.get_for_model(model)
for m in model._default_manager.all().iterator():
self.extract_from_instance(m, processor, fields, ct)
class SourceText(models.Model):
"""
Source text is plain text with processor-specific formatting inputted by user.
"""
processor = models.ForeignKey(TextProcessor)
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
field = models.CharField(max_length=64)
target = GenericForeignKey('content_type', 'object_id')
modification_time = models.DateTimeField(auto_now=True)
content = models.TextField()
objects = SourceTextManager()
def __unicode__(self):
return u"Source text of %s '%s' %s" % (self.content_type, self.target, self.field)
@property
def target_field(self):
return getattr(self.target, self.field)
def render(self):
if not self.content:
return ''
return self.processor.convert(self.content)
class Meta:
unique_together = (('content_type', 'object_id', 'field'),)
verbose_name = (_('Text source'))
verbose_name_plural = (_('Text sources'))
def delete_listener(sender, instance, **kwargs):
SourceText.objects.delete_for_object(instance)
signals.post_delete.connect(receiver=delete_listener, weak=False)
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