Mercurial > hg > contenttransformer
annotate contenttransformer/transformers.py @ 12:59496de89997
allow graphviz to serve svg
author | Jeff Hammel <jhammel@mozilla.com> |
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date | Wed, 30 Jun 2010 22:01:50 -0700 |
parents | a9ddcfc7c4e8 |
children | 946176949bba |
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1 import docutils.core |
2 | 2 import subprocess |
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3 from webob import Request, Response |
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4 |
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5 class Transformer(object): |
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6 """abstract base class for transformer objects""" |
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7 def __init__(self, content, content_type): |
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8 self.content = content |
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9 self.content_type = content_type |
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10 |
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11 def transform(self, request): |
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12 """returns a tuple of (body, content-type)""" |
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13 raise NotImplementedError |
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14 |
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15 def __call__(self, environ, start_response): |
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16 request = Request(environ) |
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17 response = self.get_response(request) |
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18 return response(environ, start_response) |
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19 |
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20 def get_response(self, request): |
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21 if request.GET.get('format') == 'raw': |
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22 return Response(content_type=self.content_type, body=self.content) |
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23 content_type, body = self.transform(request) |
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24 return Response(content_type=content_type, body=body) |
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25 |
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26 class ContentTypeChanger(Transformer): |
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27 def __init__(self, content, from_type, to_type): |
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28 self.to_type = to_type |
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29 Transformer.__init__(self, content, from_type) |
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30 |
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31 def transform(self, request): |
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32 return (self.to_type, self.content) |
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33 |
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34 class Graphviz(Transformer): |
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35 content_types = { 'png': 'image/png', |
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36 'svg': 'image/svg+xml' } |
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37 |
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38 def __init__(self, content, content_type, format='png'): |
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39 self.format=format |
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40 Transformer.__init__(self, content, content_type) |
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Jeff Hammel <jhammel@mozilla.com>
parents:
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41 |
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42 def transform(self, request): |
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k0s <k0scist@gmail.com>
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43 """create a Graphviz object""" |
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44 _format = request.GET.get('format', self.format) |
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Jeff Hammel <jhammel@mozilla.com>
parents:
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45 assert _format in self.content_types, 'Unknown format: ' + _format |
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parents:
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46 process = subprocess.Popen(['dot', '-T' + _format], |
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47 stdin=subprocess.PIPE, |
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k0s <k0scist@gmail.com>
parents:
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48 stdout=subprocess.PIPE) |
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parents:
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49 image, _ = process.communicate(self.content) |
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50 return (self.content_types[_format], image) |
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k0s <k0scist@gmail.com>
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51 |
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52 class RestructuredText(Transformer): |
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53 settings = { 'report_level': 5 } |
29805d442afc
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parents:
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54 |
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55 def transform(self, request): |
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29805d442afc
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k0s <k0scist@gmail.com>
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56 """template: genshi(?) template to use (???)""" |
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57 html = docutils.core.publish_string(self.content, |
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58 writer_name='html', |
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59 settings_overrides=self.settings) |
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60 return ('text/html', html) |