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annotate piecrust/routing.py @ 281:0641fe5c3ef9

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serve: Don't crash when a post URL doesn't match our expectations. It can happen that a posts source's URL pattern matches that of something else, like a taxonomy page. In this case, don't crash when what we think will be integers turn out to be something else. Instead, just return that no page has been found.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 01 Mar 2015 21:41:05 -0800
parents 61145dcd56e0
children 422052d2e978
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 import re
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2 import os.path
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3 import logging
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6 logger = logging.getLogger(__name__)
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8
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9 route_re = re.compile(r'%((?P<qual>path):)?(?P<name>\w+)%')
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10 template_func_re = re.compile(r'^(?P<name>\w+)\((?P<first_arg>\w+)(?P<other_args>.*)\)\s*$')
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11 template_func_arg_re = re.compile(r',\s*(?P<arg>\w+)')
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12 ugly_url_cleaner = re.compile(r'\.html$')
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14
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15 class IRouteMetadataProvider(object):
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16 def getRouteMetadata(self):
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17 raise NotImplementedError()
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18
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19
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20 class Route(object):
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21 """ Information about a route for a PieCrust application.
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22 Each route defines the "shape" of an URL and how it maps to
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23 sources and taxonomies.
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24 """
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25 def __init__(self, app, cfg):
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26 self.app = app
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27
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28 self.pretty_urls = app.config.get('site/pretty_urls')
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29 self.trailing_slash = app.config.get('site/trailing_slash')
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30 self.pagination_suffix_format = app.config.get(
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31 '__cache/pagination_suffix_format')
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32 self.uri_root = app.config.get('site/root').rstrip('/') + '/'
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33
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34 uri = cfg['url']
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35 self.uri_pattern = uri.lstrip('/')
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36 self.uri_format = route_re.sub(self._uriFormatRepl, self.uri_pattern)
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37 if app.config.get('site/show_debug_info'):
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38 self.uri_format += '?!debug'
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39
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40 # Get the straight-forward regex for matching this URI pattern.
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41 re_suffix = '$'
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42 p = route_re.sub(self._uriPatternRepl, self.uri_pattern) + re_suffix
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43 self.uri_re = re.compile(p)
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44
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45 # If the URI pattern has a 'path'-type component, we'll need to match
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46 # the versions for which that component is empty. So for instance if
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47 # we have `/foo/%path:bar%`, we may need to match `/foo` (note the
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48 # lack of a trailing slash). We have to build a special pattern (in
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49 # this case without that trailing slash) to match those situations.
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50 # (maybe there's a better way to do it but I can't think of any
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51 # right now)
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52 uri_pattern_no_path = (
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53 route_re.sub(self._uriNoPathRepl, self.uri_pattern)
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54 .replace('//', '/')
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55 .rstrip('/'))
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56 if uri_pattern_no_path != self.uri_pattern:
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57 p = route_re.sub(self._uriPatternRepl, uri_pattern_no_path) + '$'
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58 self.uri_re_no_path = re.compile(p)
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59 else:
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60 self.uri_re_no_path = None
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61
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62 self.source_name = cfg['source']
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63 self.taxonomy = cfg.get('taxonomy')
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64 self.required_source_metadata = set()
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65 for m in route_re.finditer(uri):
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66 self.required_source_metadata.add(m.group('name'))
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67 self.template_func = None
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68 self.template_func_name = None
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69 self.template_func_args = []
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70 self._createTemplateFunc(cfg.get('func'))
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71
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72 @property
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73 def source(self):
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74 for src in self.app.sources:
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75 if src.name == self.source_name:
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76 return src
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77 raise Exception("Can't find source '%s' for route '%'." % (
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78 self.source_name, self.uri))
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79
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80 @property
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81 def source_realm(self):
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82 return self.source.realm
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83
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84 def matchesMetadata(self, source_metadata):
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85 return self.required_source_metadata.issubset(source_metadata.keys())
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86
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87 def matchUri(self, uri):
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88 if not self.pretty_urls:
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89 uri = ugly_url_cleaner.sub('', uri)
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90 elif self.trailing_slash:
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91 uri = uri.rstrip('/')
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92
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93 m = self.uri_re.match(uri)
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94 if m:
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95 return m.groupdict()
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96 if self.uri_re_no_path:
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97 m = self.uri_re_no_path.match(uri)
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98 if m:
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99 return m.groupdict()
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100 return None
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101
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102 def getUri(self, source_metadata, *, sub_num=1, provider=None,
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103 include_site_root=True):
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104 if provider:
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105 source_metadata = dict(source_metadata)
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106 source_metadata.update(provider.getRouteMetadata())
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107
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108 #TODO: fix this hard-coded shit
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109 for key in ['year', 'month', 'day']:
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110 if key in source_metadata and isinstance(source_metadata[key], str):
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111 source_metadata[key] = int(source_metadata[key])
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112
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113 uri = self.uri_format % source_metadata
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114 suffix = None
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115 if sub_num > 1:
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116 # Note that we know the pagination suffix starts with a slash.
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117 suffix = self.pagination_suffix_format % {'num': sub_num}
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118
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119 if self.pretty_urls:
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120 # Output will be:
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121 # - `subdir/name`
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122 # - `subdir/name/2`
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123 # - `subdir/name.ext`
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124 # - `subdir/name.ext/2`
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125 if suffix:
262
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126 if uri == '':
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127 uri = suffix.lstrip('/')
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128 else:
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129 uri = uri.rstrip('/') + suffix
256
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130 if self.trailing_slash:
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131 uri = uri.rstrip('/') + '/'
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132 else:
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133 # Output will be:
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134 # - `subdir/name.html`
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135 # - `subdir/name/2.html`
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136 # - `subdir/name.ext`
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137 # - `subdir/name/2.ext`
262
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138 if uri == '':
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139 if suffix:
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140 uri = suffix.lstrip('/') + '.html'
256
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141 else:
262
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142 base_uri, ext = os.path.splitext(uri)
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143 if not ext:
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144 ext = '.html'
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145 if suffix:
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146 uri = base_uri + suffix + ext
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147 else:
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148 uri = base_uri + ext
256
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149
235
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150 if include_site_root:
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151 uri = self.uri_root + uri
256
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152
235
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153 return uri
3
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154
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155 def _uriFormatRepl(self, m):
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156 name = m.group('name')
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157 #TODO: fix this hard-coded shit
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158 if name == 'year':
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159 return '%(year)04d'
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160 if name == 'month':
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161 return '%(month)02d'
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162 if name == 'day':
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163 return '%(day)02d'
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164 return '%(' + name + ')s'
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165
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166 def _uriPatternRepl(self, m):
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167 name = m.group('name')
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168 qualifier = m.group('qual')
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169 if qualifier == 'path':
173
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170 return r'(?P<%s>[^\?]*)' % name
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171 return r'(?P<%s>[^/\?]+)' % name
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172
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173 def _uriNoPathRepl(self, m):
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174 name = m.group('name')
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175 qualifier = m.group('qual')
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176 if qualifier == 'path':
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177 return ''
3
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178 return r'(?P<%s>[^/\?]+)' % name
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179
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180 def _createTemplateFunc(self, func_def):
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181 if func_def is None:
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182 return
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183
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184 m = template_func_re.match(func_def)
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185 if m is None:
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186 raise Exception("Template function definition for route '%s' "
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187 "has invalid syntax: %s" %
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188 (self.uri_pattern, func_def))
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189
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190 self.template_func_name = m.group('name')
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191 self.template_func_args.append(m.group('first_arg'))
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192 arg_list = m.group('other_args')
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193 if arg_list:
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194 self.template_func_args += template_func_arg_re.findall(arg_list)
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195
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196 if self.taxonomy:
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197 # This will be a taxonomy route function... this means we can
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198 # have a variable number of parameters, but only one parameter
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199 # definition, which is the value.
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200 if len(self.template_func_args) != 1:
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201 raise Exception("Route '%s' is a taxonomy route and must have "
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202 "only one argument, which is the term value." %
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203 self.uri_pattern)
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204
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205 def template_func(*args):
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206 if len(args) == 0:
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207 raise Exception(
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208 "Route function '%s' expected at least one "
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diff changeset
209 "argument." % func_def)
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210
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211 # Term combinations can be passed as an array, or as multiple
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212 # arguments.
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213 values = args
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214 if len(args) == 1 and isinstance(args[0], list):
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215 values = args[0]
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216
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217 # We need to register this use of a taxonomy term.
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diff changeset
218 if len(values) == 1:
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219 registered_values = values[0]
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220 else:
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221 registered_values = tuple(values)
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222 eis = self.app.env.exec_info_stack
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223 eis.current_page_info.render_ctx.used_taxonomy_terms.add(
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224 (self.source_name, self.taxonomy, registered_values))
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225
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226 if len(values) == 1:
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227 str_values = values[0]
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228 else:
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229 str_values = '/'.join(values)
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230 term_name = self.template_func_args[0]
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diff changeset
231 metadata = {term_name: str_values}
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232
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233 return self.getUri(metadata)
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234
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235 else:
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236 # Normal route function.
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237 def template_func(*args):
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238 if len(args) != len(self.template_func_args):
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239 raise Exception(
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240 "Route function '%s' expected %d arguments, "
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241 "got %d." %
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242 (func_def, len(self.template_func_args),
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243 len(args)))
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244 metadata = {}
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245 for arg_name, arg_val in zip(self.template_func_args, args):
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246 metadata[arg_name] = arg_val
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247 return self.getUri(metadata)
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248
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249 self.template_func = template_func
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250
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251
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252 class CompositeRouteFunction(object):
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253 def __init__(self):
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254 self._funcs = []
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255 self._arg_names = None
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256
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257 def addFunc(self, route):
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258 if self._arg_names is None:
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259 self._arg_names = sorted(route.template_func_args)
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260
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261 if sorted(route.template_func_args) != self._arg_names:
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262 raise Exception("Cannot merge route function with arguments '%s' "
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263 "with route function with arguments '%s'." %
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264 (route.template_func_args, self._arg_names))
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265 self._funcs.append((route, route.template_func))
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266
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267 def __call__(self, *args, **kwargs):
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268 if len(args) == len(self._arg_names):
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269 f = self._funcs[0][1]
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270 return f(*args, **kwargs)
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271
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272 if len(args) == len(self._arg_names) + 1:
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273 f_args = args[:-1]
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274 for r, f in self._funcs:
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275 if r.source_name == args[-1]:
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276 return f(f_args, **kwargs)
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277 raise Exception("No such source: %s" % args[-1])
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278
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279 raise Exception("Incorrect number of arguments for route function. "
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280 "Expected '%s', got '%s'" % (self._arg_names, args))
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281