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annotate piecrust/routing.py @ 255:ef8e5f9efdbd

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docs: Website configuration reference.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 22 Feb 2015 21:53:53 -0800
parents 55087da9a72e
children da5e6e00fb41
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1 import re
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2 import logging
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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
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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 if app.config.get('site/show_debug_info'):
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30 self.uri_format += '?!debug'
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32 # Get the straight-forward regex for matching this URI pattern.
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33 p = route_re.sub(self._uriPatternRepl, self.uri_pattern) + '$'
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34 self.uri_re = re.compile(p)
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36 # If the URI pattern has a 'path'-type component, we'll need to match
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37 # the versions for which that component is empty. So for instance if
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38 # we have `/foo/%path:bar%`, we may need to match `/foo` (note the
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39 # lack of a trailing slash). We have to build a special pattern (in
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40 # this case without that trailing slash) to match those situations.
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41 # (maybe there's a better way to do it but I can't think of any
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42 # right now)
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43 uri_pattern_no_path = (
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44 route_re.sub(self._uriNoPathRepl, self.uri_pattern)
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45 .replace('//', '/')
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46 .rstrip('/'))
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47 if uri_pattern_no_path != self.uri_pattern:
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48 p = route_re.sub(self._uriPatternRepl, uri_pattern_no_path) + '$'
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49 self.uri_re_no_path = re.compile(p)
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50 else:
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51 self.uri_re_no_path = None
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52
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53 self.source_name = cfg['source']
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54 self.taxonomy = cfg.get('taxonomy')
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55 self.required_source_metadata = set()
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56 for m in route_re.finditer(uri):
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57 self.required_source_metadata.add(m.group('name'))
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58 self.template_func = None
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59 self.template_func_name = None
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60 self.template_func_args = []
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61 self._createTemplateFunc(cfg.get('func'))
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62
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63 @property
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64 def source(self):
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65 for src in self.app.sources:
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66 if src.name == self.source_name:
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67 return src
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68 raise Exception("Can't find source '%s' for route '%'." % (
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69 self.source_name, self.uri))
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70
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71 @property
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72 def source_realm(self):
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73 return self.source.realm
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74
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75 def matchesMetadata(self, source_metadata):
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76 return self.required_source_metadata.issubset(source_metadata.keys())
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77
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78 def matchUri(self, uri):
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79 m = self.uri_re.match(uri)
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80 if m:
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81 return m.groupdict()
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82 if self.uri_re_no_path:
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83 m = self.uri_re_no_path.match(uri)
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84 if m:
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85 return m.groupdict()
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86 return None
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87
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88 def getUri(self, source_metadata, provider=None, include_site_root=True):
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89 if provider:
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90 source_metadata = dict(source_metadata)
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91 source_metadata.update(provider.getRouteMetadata())
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92 #TODO: fix this hard-coded shit
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93 for key in ['year', 'month', 'day']:
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94 if key in source_metadata and isinstance(source_metadata[key], str):
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95 source_metadata[key] = int(source_metadata[key])
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96 uri = self.uri_format % source_metadata
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97 if include_site_root:
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98 uri = self.uri_root + uri
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99 return uri
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100
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101 def _uriFormatRepl(self, m):
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102 name = m.group('name')
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103 #TODO: fix this hard-coded shit
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104 if name == 'year':
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105 return '%(year)04d'
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106 if name == 'month':
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107 return '%(month)02d'
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108 if name == 'day':
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109 return '%(day)02d'
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110 return '%(' + name + ')s'
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111
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112 def _uriPatternRepl(self, m):
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113 name = m.group('name')
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114 qualifier = m.group('qual')
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115 if qualifier == 'path':
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116 return r'(?P<%s>[^\?]*)' % name
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117 return r'(?P<%s>[^/\?]+)' % name
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118
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119 def _uriNoPathRepl(self, m):
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120 name = m.group('name')
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121 qualifier = m.group('qual')
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122 if qualifier == 'path':
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123 return ''
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124 return r'(?P<%s>[^/\?]+)' % name
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125
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126 def _createTemplateFunc(self, func_def):
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127 if func_def is None:
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128 return
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129
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130 m = template_func_re.match(func_def)
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131 if m is None:
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132 raise Exception("Template function definition for route '%s' "
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133 "has invalid syntax: %s" %
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134 (self.uri_pattern, func_def))
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135
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136 self.template_func_name = m.group('name')
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137 self.template_func_args.append(m.group('first_arg'))
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138 arg_list = m.group('other_args')
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139 if arg_list:
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140 self.template_func_args += template_func_arg_re.findall(arg_list)
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141
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142 if self.taxonomy:
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143 # This will be a taxonomy route function... this means we can
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144 # have a variable number of parameters, but only one parameter
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145 # definition, which is the value.
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146 if len(self.template_func_args) != 1:
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147 raise Exception("Route '%s' is a taxonomy route and must have "
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148 "only one argument, which is the term value." %
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149 self.uri_pattern)
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150
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151 def template_func(*args):
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152 if len(args) == 0:
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153 raise Exception(
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154 "Route function '%s' expected at least one "
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155 "argument." % func_def)
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156
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157 # Term combinations can be passed as an array, or as multiple
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158 # arguments.
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159 values = args
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160 if len(args) == 1 and isinstance(args[0], list):
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161 values = args[0]
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162
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163 # We need to register this use of a taxonomy term.
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164 if len(values) == 1:
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165 registered_values = values[0]
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166 else:
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167 registered_values = tuple(values)
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168 eis = self.app.env.exec_info_stack
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169 eis.current_page_info.render_ctx.used_taxonomy_terms.add(
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170 (self.source_name, self.taxonomy, registered_values))
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171
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172 if len(values) == 1:
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173 str_values = values[0]
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174 else:
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175 str_values = '/'.join(values)
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176 term_name = self.template_func_args[0]
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177 metadata = {term_name: str_values}
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178
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179 return self.getUri(metadata)
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180
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181 else:
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182 # Normal route function.
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183 def template_func(*args):
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184 if len(args) != len(self.template_func_args):
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185 raise Exception(
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186 "Route function '%s' expected %d arguments, "
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187 "got %d." %
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188 (func_def, len(self.template_func_args),
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189 len(args)))
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190 metadata = {}
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191 for arg_name, arg_val in zip(self.template_func_args, args):
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192 metadata[arg_name] = arg_val
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193 return self.getUri(metadata)
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194
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195 self.template_func = template_func
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196
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197
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198 class CompositeRouteFunction(object):
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199 def __init__(self):
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200 self._funcs = []
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201 self._arg_names = None
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202
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203 def addFunc(self, route):
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204 if self._arg_names is None:
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205 self._arg_names = sorted(route.template_func_args)
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206
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207 if sorted(route.template_func_args) != self._arg_names:
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208 raise Exception("Cannot merge route function with arguments '%s' "
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209 "with route function with arguments '%s'." %
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210 (route.template_func_args, self._arg_names))
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211 self._funcs.append((route, route.template_func))
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212
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213 def __call__(self, *args, **kwargs):
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214 if len(args) == len(self._arg_names):
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215 f = self._funcs[0][1]
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216 return f(*args, **kwargs)
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217
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218 if len(args) == len(self._arg_names) + 1:
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219 f_args = args[:-1]
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220 for r, f in self._funcs:
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221 if r.source_name == args[-1]:
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222 return f(f_args, **kwargs)
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223 raise Exception("No such source: %s" % args[-1])
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224
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225 raise Exception("Incorrect number of arguments for route function. "
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226 "Expected '%s', got '%s'" % (self._arg_names, args))
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227