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1 """
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2 Models for the smiley application.
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3 """
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4 import re
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5
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6 from django.db import models
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7 from django.core.cache import cache
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8
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9 CACHE_TIMEOUT = 60 * 60 # seconds
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10
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11
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12 class SmileyManager(models.Manager):
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13
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14 def get_smiley_map(self):
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15 """
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16 Returns a dictionary, the keys are smiley codes.
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17 The values are the HTML representations of the keys.
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18 The dictionary is cached.
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19 """
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20 map = cache.get('smiley_map')
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21 if map:
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22 return map
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23
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24 map = dict((s.code, s.html()) for s in self.all())
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25 cache.set('smiley_map', map, CACHE_TIMEOUT)
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26 return map
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27
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28 def get_smilies(self, extra=False):
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29 """
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30 Returns smiley model instances filtered by the extra flag.
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31 """
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32 key = 'smileys' if not extra else 'smileys_extra'
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33 smilies = cache.get(key)
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34 if smilies:
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35 return smilies
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36
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37 smilies = self.filter(is_extra=extra)
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38 cache.set(key, smilies, CACHE_TIMEOUT)
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39 return smilies
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40
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41 def get_smiley_regexes(self):
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42 """
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43 Returns a list of 2-tuples of the form: (regex, repl)
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44 where regex is a regular expression for a smiley and
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45 repl is the replacement image in Markdown format.
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46 """
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47 regexes = cache.get('smiley_regexes')
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48 if regexes:
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49 return regexes
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50
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51 regexes = [(re.compile(r"(^|\s|(?<=\s))%s(\s|$)" % re.escape(s.code)),
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52 r"\1%s\2" % s.markdown()) for s in self.all()]
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53 cache.set('smiley_regexes', regexes, CACHE_TIMEOUT)
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54 return regexes
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55
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56
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57 class Smiley(models.Model):
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58 image = models.ImageField(upload_to='smiley/images/')
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59 title = models.CharField(max_length=32)
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60 code = models.CharField(max_length=32)
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61 is_extra = models.BooleanField()
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62
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63 objects = SmileyManager()
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64
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65 class Meta:
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66 verbose_name_plural = 'Smilies'
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67 ordering = ('title', )
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68
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69 def __unicode__(self):
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70 return self.title
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71
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72 def get_absolute_url(self):
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73 return self.image.url
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74
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75 def html(self):
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76 """Returns a HTML img tag representation of the smiley."""
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77 if self.image:
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78 return (u'<img src="%s" alt="%s" title="%s" />' %
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79 (self.get_absolute_url(), self.title, self.title))
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80 return u''
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81 html.allow_tags = True
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82
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83 def markdown(self):
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84 """Returns a markdown representation of the smiley."""
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85 if self.image:
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86 return (u'' %
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87 (self.title, self.get_absolute_url(), self.title))
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88 return u''
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