Mercurial > hg > contenttransformer

annotate contenttransformer/transformers.py @ 10:a9ddcfc7c4e8

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added transformer just of content-type name
author k0s <k0scist@gmail.com>
date Sun, 07 Feb 2010 19:48:09 -0500
parents 051d4d39b4b9
children 59496de89997
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1 import docutils.core
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2 import subprocess
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3 from webob import Request, Response
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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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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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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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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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31 def transform(self, request):
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32 return (self.to_type, self.content)
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34 class Graphviz(Transformer):
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35 def transform(self, request):
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36 """create a Graphviz object"""
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37 process = subprocess.Popen(['dot', '-Tpng'],
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38 stdin=subprocess.PIPE,
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39 stdout=subprocess.PIPE)
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40 image, _ = process.communicate(self.content)
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41 return ('image/png', image)
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43 class RestructuredText(Transformer):
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44 settings = { 'report_level': 5 }
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46 def transform(self, request):
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47 """template: genshi(?) template to use (???)"""
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48 html = docutils.core.publish_string(self.content,
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49 writer_name='html',
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50 settings_overrides=self.settings)
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51 return ('text/html', html)