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annotate piecrust/routing.py @ 6:f5ca5c5bed85

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More Python 3 fixes, modularization, and new unit tests.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 16 Aug 2014 08:15:30 -0700
parents f485ba500df3
children ab6e7e0e9d44
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3
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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 Route(object):
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14 """ Information about a route for a PieCrust application.
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15 Each route defines the "shape" of an URL and how it maps to
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16 sources and taxonomies.
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17 """
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18 def __init__(self, app, cfg):
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19 self.app = app
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20 uri = cfg['url']
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21 self.uri_root = app.config.get('site/root').rstrip('/') + '/'
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22 self.uri_pattern = uri.lstrip('/')
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23 self.uri_format = route_re.sub(self._uriFormatRepl, self.uri_pattern)
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24 p = route_re.sub(self._uriPatternRepl, self.uri_pattern)
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25 self.uri_re = re.compile(p)
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26 self.source_name = cfg['source']
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27 self.taxonomy = cfg.get('taxonomy')
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28 self.required_source_metadata = []
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29 for m in route_re.finditer(uri):
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30 self.required_source_metadata.append(m.group('name'))
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31 self.template_func = None
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32 self.template_func_name = None
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33 self.template_func_args = []
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34 self._createTemplateFunc(cfg.get('func'))
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35
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36 @property
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37 def source(self):
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38 for src in self.app.sources:
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39 if src.name == self.source_name:
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40 return src
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41 raise Exception("Can't find source '%s' for route '%'." % (
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42 self.source_name, self.uri))
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43
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44 @property
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45 def source_realm(self):
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46 return self.source.realm
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47
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48 def isMatch(self, source_metadata):
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49 return True
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50
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51 def getUri(self, source_metadata):
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52 #TODO: fix this hard-coded shit
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53 for key in ['year', 'month', 'day']:
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54 if key in source_metadata and isinstance(source_metadata[key], str):
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55 source_metadata[key] = int(source_metadata[key])
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56 return self.uri_root + (self.uri_format % source_metadata)
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57
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58 def _uriFormatRepl(self, m):
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59 name = m.group('name')
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60 #TODO: fix this hard-coded shit
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61 if name == 'year':
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62 return '%(year)04d'
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63 if name == 'month':
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64 return '%(month)02d'
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65 if name == 'day':
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66 return '%(day)02d'
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67 return '%(' + name + ')s'
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68
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69 def _uriPatternRepl(self, m):
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70 name = m.group('name')
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71 qualifier = m.group('qual')
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72 if qualifier == 'path':
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73 return r'(?P<%s>.*)' % name
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74 return r'(?P<%s>[^/\?]+)' % name
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75
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76 def _createTemplateFunc(self, func_def):
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77 if func_def is None:
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78 return
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79
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80 m = template_func_re.match(func_def)
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81 if m is None:
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82 raise Exception("Template function definition for route '%s' "
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83 "has invalid syntax: %s" %
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84 (self.uri_pattern, func_def))
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85
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86 self.template_func_name = m.group('name')
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87 self.template_func_args.append(m.group('first_arg'))
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88 arg_list = m.group('other_args')
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89 if arg_list:
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90 self.template_func_args += template_func_arg_re.findall(arg_list)
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91
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92 if self.taxonomy:
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93 # This will be a taxonomy route function... this means we can
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94 # have a variable number of parameters, but only one parameter
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95 # definition, which is the value.
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96 if len(self.template_func_args) != 1:
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97 raise Exception("Route '%s' is a taxonomy route and must have "
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98 "only one argument, which is the term value." %
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99 self.uri_pattern)
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100
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101 def template_func(*args):
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102 if len(args) == 0:
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103 raise Exception(
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104 "Route function '%s' expected at least one "
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105 "argument." % func_def)
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106
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107 # Term combinations can be passed as an array, or as multiple
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108 # arguments.
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109 values = args
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110 if len(args) == 1 and isinstance(args[0], list):
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111 values = args[0]
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112
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113 # We need to register this use of a taxonomy term.
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114 if len(values) == 1:
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115 registered_values = values[0]
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116 else:
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117 registered_values = tuple(values)
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118 eis = self.app.env.exec_info_stack
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119 eis.current_page_info.render_ctx.used_taxonomy_terms.add(
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120 (self.source_name, self.taxonomy, registered_values))
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121
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122 if len(values) == 1:
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123 str_values = values[0]
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124 else:
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125 str_values = '/'.join(values)
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126 term_name = self.template_func_args[0]
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127 metadata = {term_name: str_values}
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128
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129 return self.getUri(metadata)
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130
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131 else:
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132 # Normal route function.
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133 def template_func(*args):
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134 if len(args) != len(self.template_func_args):
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135 raise Exception(
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136 "Route function '%s' expected %d arguments, "
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137 "got %d." %
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138 (func_def, len(self.template_func_args),
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139 len(args)))
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140 metadata = {}
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141 for arg_name, arg_val in zip(self.template_func_args, args):
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142 metadata[arg_name] = arg_val
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143 return self.getUri(metadata)
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144
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145 self.template_func = template_func
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146
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147
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148 class CompositeRouteFunction(object):
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149 def __init__(self):
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150 self._funcs = []
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151 self._arg_names = None
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152
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153 def addFunc(self, route):
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154 if self._arg_names is None:
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155 self._arg_names = sorted(route.template_func_args)
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156
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157 if sorted(route.template_func_args) != self._arg_names:
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158 raise Exception("Cannot merge route function with arguments '%s' "
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159 "with route function with arguments '%s'." %
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160 (route.template_func_args, self._arg_names))
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161 self._funcs.append((route, route.template_func))
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162
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163 def __call__(self, *args, **kwargs):
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164 if len(args) == len(self._arg_names):
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165 f = self._funcs[0][1]
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166 return f(*args, **kwargs)
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167
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168 if len(args) == len(self._arg_names) + 1:
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169 f_args = args[:-1]
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170 for r, f in self._funcs:
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171 if r.source_name == args[-1]:
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172 return f(f_args, **kwargs)
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173 raise Exception("No such source: %s" % args[-1])
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174
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175 raise Exception("Incorrect number of arguments for route function. "
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176 "Expected '%s', got '%s'" % (self._arg_names, args))
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177