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annotate contenttransformer/transformers.py @ 7:68643e72c749

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use abstract base class for transformers so that behaviour can be streamlined
author k0s <k0scist@gmail.com>
date Wed, 03 Feb 2010 17:56:24 -0500
parents 1a267297f779
children 051d4d39b4b9
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29805d442afc initial commit of contenttransformer; still in the stub stage
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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):
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8 self.content = content
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10 def transform(self, request):
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11 """returns a tuple of (body, content-type)"""
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12 raise NotImplementedError
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13
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14 def __call__(self, environ, start_response):
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15 request = Request(environ)
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16 content_type, body = self.transform(request)
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17 return Response(content_type=content_type, body=body)(environ, start_response)
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19 class Graphviz(Transformer):
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20 def transform(self, request):
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21 """create a Graphviz object"""
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22 process = subprocess.Popen(['dot', '-Tpng'],
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23 stdin=subprocess.PIPE,
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24 stdout=subprocess.PIPE)
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25 image, _ = process.communicate(self.content)
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26 return ('image/png', image)
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28 class RestructuredText(Transformer):
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29 settings = { 'report_level': 5 }
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31 def transform(self, request):
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32 """template: genshi(?) template to use (???)"""
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33 html = docutils.core.publish_string(self.content,
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34 writer_name='html',
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35 settings_overrides=self.settings)
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36 return ('text/html', html)