Mercurial > piecrust2

annotate piecrust/routing.py @ 147:ab6e7e0e9d44

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Pass date information to routing when building URLs. This is so that URLs with dates in them can be built even when the date information is not coming from the source metadata, but from the page's config.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 29 Nov 2014 21:00:44 -0800
parents f485ba500df3
children a42469dbdc47
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 logging
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3
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4
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5 logger = logging.getLogger(__name__)
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6
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7
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8 route_re = re.compile(r'%((?P<qual>path):)?(?P<name>\w+)%')
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9 template_func_re = re.compile(r'^(?P<name>\w+)\((?P<first_arg>\w+)(?P<other_args>.*)\)\s*$')
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10 template_func_arg_re = re.compile(r',\s*(?P<arg>\w+)')
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11
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12
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13 class IRouteMetadataProvider(object):
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14 def getRouteMetadata(self):
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15 raise NotImplementedError()
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16
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17
3
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18 class Route(object):
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19 """ Information about a route for a PieCrust application.
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20 Each route defines the "shape" of an URL and how it maps to
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21 sources and taxonomies.
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22 """
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23 def __init__(self, app, cfg):
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24 self.app = app
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25 uri = cfg['url']
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26 self.uri_root = app.config.get('site/root').rstrip('/') + '/'
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27 self.uri_pattern = uri.lstrip('/')
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28 self.uri_format = route_re.sub(self._uriFormatRepl, self.uri_pattern)
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29 p = route_re.sub(self._uriPatternRepl, self.uri_pattern)
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30 self.uri_re = re.compile(p)
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31 self.source_name = cfg['source']
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32 self.taxonomy = cfg.get('taxonomy')
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33 self.required_source_metadata = []
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34 for m in route_re.finditer(uri):
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35 self.required_source_metadata.append(m.group('name'))
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36 self.template_func = None
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37 self.template_func_name = None
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38 self.template_func_args = []
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39 self._createTemplateFunc(cfg.get('func'))
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40
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41 @property
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42 def source(self):
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43 for src in self.app.sources:
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44 if src.name == self.source_name:
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45 return src
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46 raise Exception("Can't find source '%s' for route '%'." % (
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47 self.source_name, self.uri))
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48
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49 @property
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50 def source_realm(self):
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51 return self.source.realm
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52
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53 def isMatch(self, source_metadata):
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54 return True
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55
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56 def getUri(self, source_metadata, provider=None):
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57 if provider:
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58 source_metadata = dict(source_metadata)
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59 source_metadata.update(provider.getRouteMetadata())
3
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60 #TODO: fix this hard-coded shit
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61 for key in ['year', 'month', 'day']:
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62 if key in source_metadata and isinstance(source_metadata[key], str):
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63 source_metadata[key] = int(source_metadata[key])
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64 return self.uri_root + (self.uri_format % source_metadata)
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65
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66 def _uriFormatRepl(self, m):
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67 name = m.group('name')
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68 #TODO: fix this hard-coded shit
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69 if name == 'year':
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70 return '%(year)04d'
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71 if name == 'month':
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72 return '%(month)02d'
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73 if name == 'day':
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74 return '%(day)02d'
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75 return '%(' + name + ')s'
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76
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77 def _uriPatternRepl(self, m):
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78 name = m.group('name')
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79 qualifier = m.group('qual')
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80 if qualifier == 'path':
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81 return r'(?P<%s>.*)' % name
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82 return r'(?P<%s>[^/\?]+)' % name
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83
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84 def _createTemplateFunc(self, func_def):
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85 if func_def is None:
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86 return
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87
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88 m = template_func_re.match(func_def)
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89 if m is None:
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90 raise Exception("Template function definition for route '%s' "
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91 "has invalid syntax: %s" %
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92 (self.uri_pattern, func_def))
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93
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94 self.template_func_name = m.group('name')
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95 self.template_func_args.append(m.group('first_arg'))
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96 arg_list = m.group('other_args')
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97 if arg_list:
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98 self.template_func_args += template_func_arg_re.findall(arg_list)
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99
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100 if self.taxonomy:
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101 # This will be a taxonomy route function... this means we can
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102 # have a variable number of parameters, but only one parameter
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103 # definition, which is the value.
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104 if len(self.template_func_args) != 1:
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105 raise Exception("Route '%s' is a taxonomy route and must have "
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106 "only one argument, which is the term value." %
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107 self.uri_pattern)
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108
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109 def template_func(*args):
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110 if len(args) == 0:
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111 raise Exception(
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112 "Route function '%s' expected at least one "
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113 "argument." % func_def)
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114
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115 # Term combinations can be passed as an array, or as multiple
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116 # arguments.
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117 values = args
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118 if len(args) == 1 and isinstance(args[0], list):
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119 values = args[0]
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120
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121 # We need to register this use of a taxonomy term.
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122 if len(values) == 1:
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123 registered_values = values[0]
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124 else:
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125 registered_values = tuple(values)
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126 eis = self.app.env.exec_info_stack
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127 eis.current_page_info.render_ctx.used_taxonomy_terms.add(
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128 (self.source_name, self.taxonomy, registered_values))
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129
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130 if len(values) == 1:
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131 str_values = values[0]
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132 else:
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133 str_values = '/'.join(values)
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134 term_name = self.template_func_args[0]
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135 metadata = {term_name: str_values}
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136
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137 return self.getUri(metadata)
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138
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139 else:
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140 # Normal route function.
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141 def template_func(*args):
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142 if len(args) != len(self.template_func_args):
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143 raise Exception(
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144 "Route function '%s' expected %d arguments, "
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145 "got %d." %
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146 (func_def, len(self.template_func_args),
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147 len(args)))
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148 metadata = {}
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149 for arg_name, arg_val in zip(self.template_func_args, args):
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150 metadata[arg_name] = arg_val
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151 return self.getUri(metadata)
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152
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153 self.template_func = template_func
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154
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155
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156 class CompositeRouteFunction(object):
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157 def __init__(self):
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158 self._funcs = []
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159 self._arg_names = None
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160
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161 def addFunc(self, route):
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162 if self._arg_names is None:
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163 self._arg_names = sorted(route.template_func_args)
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164
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165 if sorted(route.template_func_args) != self._arg_names:
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166 raise Exception("Cannot merge route function with arguments '%s' "
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167 "with route function with arguments '%s'." %
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168 (route.template_func_args, self._arg_names))
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169 self._funcs.append((route, route.template_func))
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170
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171 def __call__(self, *args, **kwargs):
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172 if len(args) == len(self._arg_names):
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173 f = self._funcs[0][1]
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174 return f(*args, **kwargs)
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175
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176 if len(args) == len(self._arg_names) + 1:
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177 f_args = args[:-1]
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178 for r, f in self._funcs:
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179 if r.source_name == args[-1]:
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180 return f(f_args, **kwargs)
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181 raise Exception("No such source: %s" % args[-1])
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182
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183 raise Exception("Incorrect number of arguments for route function. "
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184 "Expected '%s', got '%s'" % (self._arg_names, args))
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185