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annotate roundup/web/router.py @ 4924:6ee1844019d5 routing

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routing: Add DEBUG flag for troubleshooting
author anatoly techtonik <techtonik@gmail.com>
date Wed, 20 Aug 2014 13:36:08 +0300
parents 35dc9191394d
children 997fa47c92d5
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1 #!/usr/bin/env python
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2 """
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3 The purpose of router is to make Roundup URL scheme configurable
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4 and allow extensions add their own handlers and URLs to tracker.
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5
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6 Public domain work by:
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7 anatoly techtonik <techtonik@gmail.com>
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8 """
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9
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10 DEBUG = False
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11
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12
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13 import re
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14
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15 # --- Example URL mapping
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16
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17 class NamedObject(object):
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18 """Object that outputs given name when printed"""
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19 def __init__(self, name):
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20 self.name = name
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21 def __repr__(self):
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22 return self.name
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23
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24 ExampleHandler = NamedObject('ExampleHandler')
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25 ExampleFileHandler = NamedObject('ExampleFileHandler')
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26
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27
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28 EXAMPLE_URL_MAP = (
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29 'static/(.*)', ExampleFileHandler,
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30 'index', ExampleHandler
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31 )
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32
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33
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34 # --- Regexp based router
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35
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36 class Router(object):
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37
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38 def __init__(self, urlmap=[]):
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39 """
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40 `urlmap` is a list (pattern, handler, pattern, ...)
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41 pattern should have no leading slash
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42 """
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43 self.urlmap = urlmap
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44
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45 def get_handler(self, urlpath):
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46 """
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47 `urlpath` is a part of url /that/looks?like=this
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48 (leading slash is optional)
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49
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50 returns tuple (handler, arguments) or (None, ())
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51 """
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52 # strip leading slashes before matching
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53 path = urlpath.lstrip('/')
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54 for i in range(0, len(self.urlmap), 2):
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55 pattern, handler = self.urlmap[i], self.urlmap[i+1]
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56 if DEBUG:
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57 print('router: matching %s' % pattern)
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58 match = re.match(pattern, path)
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59 if match:
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60 return handler, match.groups()
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61 return (None, ())
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63
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64
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65 # [ ] len(urlmap) should be even to avoid errors
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66 # (find a way to explain this to users)
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67
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68 if __name__ == '__main__':
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69
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70 import unittest
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71 class test_Router(unittest.TestCase):
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72 def test_example_routes(self):
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73 router = Router(EXAMPLE_URL_MAP)
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74 self.assertEquals(router.get_handler(''), (None, ()))
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75 handler, params = router.get_handler('/index')
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76 self.assertEquals(handler, ExampleHandler)
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77 self.assertEquals(params, tuple())
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78
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79 unittest.main()
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