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annotate piecrust/generation/taxonomy.py @ 789:b8e760b3413e

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bake: Fix how slugified taxonomy terms are handled. This fixes a problem where multiple terms all slugifying to the same thing would lead to a fatal bake error.
author Ludovic Chabant <ludovic@chabant.com>
date Mon, 05 Sep 2016 21:03:00 -0700
parents 661f7ba15762
children 58ebf50235a5
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1 import re
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2 import time
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3 import logging
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4 import unidecode
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5 from piecrust.chefutil import format_timed, format_timed_scope
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6 from piecrust.configuration import ConfigurationError
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7 from piecrust.data.filters import (
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8 PaginationFilter, SettingFilterClause,
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9 page_value_accessor)
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10 from piecrust.generation.base import PageGenerator, InvalidRecordExtraKey
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11
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12
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13 logger = logging.getLogger(__name__)
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14
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15
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16 SLUGIFY_ENCODE = 1
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17 SLUGIFY_TRANSLITERATE = 2
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18 SLUGIFY_LOWERCASE = 4
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19 SLUGIFY_DOT_TO_DASH = 8
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20 SLUGIFY_SPACE_TO_DASH = 16
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21
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22
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23 re_first_dot_to_dash = re.compile(r'^\.+')
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24 re_dot_to_dash = re.compile(r'\.+')
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25 re_space_to_dash = re.compile(r'\s+')
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26
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27
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28 class Taxonomy(object):
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29 def __init__(self, name, config):
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30 self.name = name
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31 self.config = config
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32 self.term_name = config.get('term', name)
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33 self.is_multiple = bool(config.get('multiple', False))
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34 self.separator = config.get('separator', '/')
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35 self.page_ref = config.get('page')
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36
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37 @property
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38 def setting_name(self):
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39 if self.is_multiple:
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40 return self.name
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41 return self.term_name
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42
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43
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44 class TaxonomyPageGenerator(PageGenerator):
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45 """ A page generator that handles taxonomies, _i.e._ lists of keywords
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46 that pages are labelled with, and for which we need to generate
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47 listing pages.
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48 """
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49 GENERATOR_NAME = 'taxonomy'
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50
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51 def __init__(self, app, name, config):
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52 super(TaxonomyPageGenerator, self).__init__(app, name, config)
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53
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54 tax_name = config.get('taxonomy')
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55 if tax_name is None:
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56 raise ConfigurationError(
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57 "Generator '%s' requires a taxonomy name." % name)
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58 tax_config = app.config.get('site/taxonomies/' + tax_name)
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59 if tax_config is None:
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60 raise ConfigurationError(
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61 "Error initializing generator '%s', no such taxonomy: %s",
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62 (name, tax_name))
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63 self.taxonomy = Taxonomy(tax_name, tax_config)
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64
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65 sm = config.get('slugify_mode')
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66 if not sm:
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67 sm = app.config.get('site/slugify_mode', 'encode')
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68 self.slugify_mode = _parse_slugify_mode(sm)
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69 self.slugifier = _Slugifier(self.taxonomy, self.slugify_mode)
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70
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71 def slugify(self, term):
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72 return self.slugifier.slugify(term)
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73
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74 def slugifyMultiple(self, terms):
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75 return self.slugifier.slugifyMultiple(terms)
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76
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77 def prepareRenderContext(self, ctx):
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78 # Set the pagination source as the source we're generating for.
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79 ctx.pagination_source = self.source
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80
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81 # Get the taxonomy terms from the route metadata... this can come from
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82 # the browser's URL (while serving) or from the baking (see `bake`
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83 # method below). In both cases, we expect to have the *slugified*
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84 # version of the term, because we're going to set a filter that also
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85 # slugifies the terms found on each page.
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86 #
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87 # This is because:
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88 # * while serving, we get everything from the request URL, so we only
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89 # have the slugified version.
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90 # * if 2 slightly different terms "collide" into the same slugified
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91 # term, we'll get a merge of the 2 on the listing page, which is
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92 # what the user expects.
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93 #
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94 tax_terms, is_combination = self._getTaxonomyTerms(
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95 ctx.page.route_metadata)
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96 self._setTaxonomyFilter(ctx, tax_terms, is_combination)
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97
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98 # Add some custom data for rendering.
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99 ctx.custom_data.update({
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100 self.taxonomy.term_name: tax_terms,
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101 'is_multiple_%s' % self.taxonomy.term_name: is_combination})
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102 # Add some "plural" version of the term... so for instance, if this
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103 # is the "tags" taxonomy, "tag" will have one term most of the time,
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104 # except when it's a combination. Here, we add "tags" as something that
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105 # is always a tuple, even when it's not a combination.
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106 if (self.taxonomy.is_multiple and
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107 self.taxonomy.name != self.taxonomy.term_name):
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108 mult_val = tax_terms
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109 if not is_combination:
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110 mult_val = (mult_val,)
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111 ctx.custom_data[self.taxonomy.name] = mult_val
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112
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113 def _getTaxonomyTerms(self, route_metadata):
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114 # Get the individual slugified terms from the route metadata.
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115 all_values = route_metadata.get(self.taxonomy.term_name)
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116 if all_values is None:
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117 raise Exception("'%s' values couldn't be found in route metadata" %
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118 self.taxonomy.term_name)
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119
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120 # If it's a "multiple" taxonomy, we need to potentially split the
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121 # route value into the individual terms (_e.g._ when listing all pages
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122 # that have 2 given tags, we need to get each of those 2 tags).
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123 if self.taxonomy.is_multiple:
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124 sep = self.taxonomy.separator
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125 if sep in all_values:
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126 return tuple(all_values.split(sep)), True
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127 # Not a "multiple" taxonomy, so there's only the one value.
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128 return all_values, False
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129
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130 def _setTaxonomyFilter(self, ctx, term_value, is_combination):
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131 # Set up the filter that will check the pages' terms.
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132 flt = PaginationFilter(value_accessor=page_value_accessor)
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133 flt.addClause(HasTaxonomyTermsFilterClause(
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134 self.taxonomy, self.slugify_mode, term_value, is_combination))
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135 ctx.pagination_filter = flt
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136
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137 def onRouteFunctionUsed(self, route, route_metadata):
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138 # Get the values, and slugify them appropriately.
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139 values = route_metadata[self.taxonomy.term_name]
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140 if self.taxonomy.is_multiple:
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141 # TODO: here we assume the route has been properly configured.
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142 slugified_values = self.slugifyMultiple((str(v) for v in values))
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143 route_val = self.taxonomy.separator.join(slugified_values)
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144 else:
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145 slugified_values = self.slugify(str(values))
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146 route_val = slugified_values
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147
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148 # We need to register this use of a taxonomy term.
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149 eis = self.app.env.exec_info_stack
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150 cpi = eis.current_page_info.render_ctx.current_pass_info
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151 if cpi:
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152 utt = cpi.getCustomInfo('used_taxonomy_terms', [], True)
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153 utt.append(slugified_values)
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154
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155 # Put the slugified values in the route metadata so they're used to
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156 # generate the URL.
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157 route_metadata[self.taxonomy.term_name] = route_val
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158
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159 def bake(self, ctx):
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160 if not self.page_ref.exists:
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161 logger.debug(
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162 "No page found at '%s', skipping taxonomy '%s'." %
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163 (self.page_ref, self.taxonomy.name))
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164 return
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165
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166 logger.debug("Baking %s pages...", self.taxonomy.name)
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167 analyzer = _TaxonomyTermsAnalyzer(self.source_name, self.taxonomy,
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168 self.slugify_mode)
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169 with format_timed_scope(logger, 'gathered taxonomy terms',
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170 level=logging.DEBUG, colored=False):
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171 analyzer.analyze(ctx)
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172
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173 start_time = time.perf_counter()
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174 page_count = self._bakeTaxonomyTerms(ctx, analyzer)
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175 if page_count > 0:
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176 logger.info(format_timed(
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177 start_time,
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178 "baked %d %s pages for %s." % (
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179 page_count, self.taxonomy.term_name, self.source_name)))
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180
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181 def _bakeTaxonomyTerms(self, ctx, analyzer):
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182 # Start baking those terms.
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183 logger.debug(
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184 "Baking '%s' for source '%s': %d terms" %
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185 (self.taxonomy.name, self.source_name,
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186 len(analyzer.dirty_slugified_terms)))
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187
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188 route = self.app.getGeneratorRoute(self.name)
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189 if route is None:
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190 raise Exception("No routes have been defined for generator: %s" %
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191 self.name)
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192
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193 logger.debug("Using taxonomy page: %s" % self.page_ref)
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194 fac = self.page_ref.getFactory()
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195
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196 job_count = 0
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197 for slugified_term in analyzer.dirty_slugified_terms:
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198 extra_route_metadata = {
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199 self.taxonomy.term_name: slugified_term}
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200
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201 # Use the slugified term as the record's extra key seed.
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202 logger.debug(
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203 "Queuing: %s [%s=%s]" %
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204 (fac.ref_spec, self.taxonomy.name, slugified_term))
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205 ctx.queueBakeJob(fac, route, extra_route_metadata, slugified_term)
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206 job_count += 1
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207 ctx.runJobQueue()
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208
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209 # Now we create bake entries for all the terms that were *not* dirty.
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210 # This is because otherwise, on the next incremental bake, we wouldn't
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211 # find any entry for those things, and figure that we need to delete
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212 # their outputs.
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213 for prev_entry, cur_entry in ctx.getAllPageRecords():
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214 # Only consider taxonomy-related entries that don't have any
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215 # current version (i.e. they weren't baked just now).
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216 if prev_entry and not cur_entry:
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217 try:
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218 t = ctx.getSeedFromRecordExtraKey(prev_entry.extra_key)
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219 except InvalidRecordExtraKey:
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220 continue
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221
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222 if analyzer.isKnownSlugifiedTerm(t):
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223 logger.debug("Creating unbaked entry for %s term: %s" %
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224 (self.name, t))
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225 ctx.collapseRecord(prev_entry)
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226 else:
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227 logger.debug("Term %s in %s isn't used anymore." %
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228 (self.name, t))
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229
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230 return job_count
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231
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232
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233 class HasTaxonomyTermsFilterClause(SettingFilterClause):
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234 def __init__(self, taxonomy, slugify_mode, value, is_combination):
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235 super(HasTaxonomyTermsFilterClause, self).__init__(
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236 taxonomy.setting_name, value)
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237 self._taxonomy = taxonomy
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238 self._is_combination = is_combination
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239 self._slugifier = _Slugifier(taxonomy, slugify_mode)
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240
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241 def pageMatches(self, fil, page):
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242 if self._taxonomy.is_multiple:
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243 # Multiple taxonomy, i.e. it supports multiple terms, like tags.
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244 page_values = fil.value_accessor(page, self.name)
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245 if page_values is None or not isinstance(page_values, list):
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246 return False
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247
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248 page_set = set(map(self._slugifier.slugify, page_values))
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249 if self._is_combination:
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250 # Multiple taxonomy, and multiple terms to match. Check that
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251 # the ones to match are all in the page's terms.
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252 value_set = set(self.value)
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253 return value_set.issubset(page_set)
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254 else:
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255 # Multiple taxonomy, one term to match.
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256 return self.value in page_set
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257 else:
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258 # Single taxonomy. Just compare the values.
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259 page_value = fil.value_accessor(page, self.name)
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260 if page_value is None:
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261 return False
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262 page_value = self._slugifier.slugify(page_value)
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263 return page_value == self.value
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264
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265
789
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266 class _TaxonomyTermsAnalyzer(object):
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267 def __init__(self, source_name, taxonomy, slugify_mode):
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268 self.source_name = source_name
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269 self.taxonomy = taxonomy
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270 self.slugifier = _Slugifier(taxonomy, slugify_mode)
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271 self._all_terms = {}
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272 self._single_dirty_slugified_terms = set()
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273 self._all_dirty_slugified_terms = None
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274
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275 @property
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276 def dirty_slugified_terms(self):
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277 """ Returns the slugified terms that have been 'dirtied' during
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278 this bake.
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279 """
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280 return self._all_dirty_slugified_terms
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281
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282 def isKnownSlugifiedTerm(self, term):
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283 """ Returns whether the given slugified term has been seen during
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284 this bake.
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285 """
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286 return term in self._all_terms
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287
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288 def analyze(self, ctx):
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289 # Build the list of terms for our taxonomy, and figure out which ones
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290 # are 'dirty' for the current bake.
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291 #
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292 # Remember all terms used.
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293 for _, cur_entry in ctx.getAllPageRecords():
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294 if cur_entry and not cur_entry.was_overriden:
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295 cur_terms = cur_entry.config.get(self.taxonomy.setting_name)
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296 if cur_terms:
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297 if not self.taxonomy.is_multiple:
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298 self._addTerm(cur_entry.path, cur_terms)
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299 else:
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300 self._addTerms(cur_entry.path, cur_terms)
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301
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302 # Re-bake all taxonomy terms that include new or changed pages, by
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303 # marking them as 'dirty'.
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diff changeset
304 for prev_entry, cur_entry in ctx.getBakedPageRecords():
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diff changeset
305 if cur_entry.source_name != self.source_name:
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306 continue
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307
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diff changeset
308 entries = [cur_entry]
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309 if prev_entry:
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diff changeset
310 entries.append(prev_entry)
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311
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diff changeset
312 for e in entries:
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313 entry_terms = e.config.get(self.taxonomy.setting_name)
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314 if entry_terms:
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315 if not self.taxonomy.is_multiple:
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diff changeset
316 self._single_dirty_slugified_terms.add(
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diff changeset
317 self.slugifier.slugify(entry_terms))
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diff changeset
318 else:
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diff changeset
319 self._single_dirty_slugified_terms.update(
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320 (self.slugifier.slugify(t)
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diff changeset
321 for t in entry_terms))
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diff changeset
322
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diff changeset
323 self._all_dirty_slugified_terms = list(
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diff changeset
324 self._single_dirty_slugified_terms)
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diff changeset
325 logger.debug("Gathered %d dirty taxonomy terms",
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diff changeset
326 len(self._all_dirty_slugified_terms))
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diff changeset
327
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diff changeset
328 # Re-bake the combination pages for terms that are 'dirty'.
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diff changeset
329 # We make all terms into tuple, even those that are not actual
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diff changeset
330 # combinations, so that we have less things to test further down the
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diff changeset
331 # line.
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diff changeset
332 #
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333 # Add the combinations to that list. We get those combinations from
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diff changeset
334 # wherever combinations were used, so they're coming from the
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diff changeset
335 # `onRouteFunctionUsed` method.
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diff changeset
336 if self.taxonomy.is_multiple:
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diff changeset
337 known_combinations = set()
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diff changeset
338 for _, cur_entry in ctx.getAllPageRecords():
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diff changeset
339 if cur_entry:
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diff changeset
340 used_terms = _get_all_entry_taxonomy_terms(cur_entry)
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diff changeset
341 for terms in used_terms:
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diff changeset
342 if len(terms) > 1:
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diff changeset
343 known_combinations.add(terms)
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diff changeset
344
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diff changeset
345 dcc = 0
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346 for terms in known_combinations:
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diff changeset
347 if not self._single_dirty_slugified_terms.isdisjoint(
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348 set(terms)):
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diff changeset
349 self._all_dirty_slugified_terms.append(
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diff changeset
350 self.taxonomy.separator.join(terms))
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diff changeset
351 dcc += 1
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diff changeset
352 logger.debug("Gathered %d term combinations, with %d dirty." %
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diff changeset
353 (len(known_combinations), dcc))
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diff changeset
354
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diff changeset
355 def _addTerms(self, entry_path, terms):
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356 for t in terms:
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357 self._addTerm(entry_path, t)
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diff changeset
358
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diff changeset
359 def _addTerm(self, entry_path, term):
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diff changeset
360 st = self.slugifier.slugify(term)
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361 orig_terms = self._all_terms.setdefault(st, [])
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diff changeset
362 if orig_terms and orig_terms[0] != term:
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diff changeset
363 logger.warning(
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diff changeset
364 "Term '%s' in '%s' is slugified to '%s' which conflicts with "
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diff changeset
365 "previously existing '%s'. The two will be merged." %
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diff changeset
366 (term, entry_path, st, orig_terms[0]))
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diff changeset
367 orig_terms.append(term)
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diff changeset
368
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369
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370 def _get_all_entry_taxonomy_terms(entry):
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371 res = set()
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372 for o in entry.subs:
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373 for pinfo in o.render_info:
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374 if pinfo:
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375 terms = pinfo.getCustomInfo('used_taxonomy_terms')
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376 if terms:
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377 res |= set(terms)
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378 return res
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379
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380
711
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381 class _Slugifier(object):
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382 def __init__(self, taxonomy, mode):
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383 self.taxonomy = taxonomy
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384 self.mode = mode
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385
789
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386 def slugifyMultiple(self, terms):
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387 return tuple(map(self.slugify, terms))
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388
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389 def slugify(self, term):
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390 if self.mode & SLUGIFY_TRANSLITERATE:
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391 term = unidecode.unidecode(term)
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392 if self.mode & SLUGIFY_LOWERCASE:
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393 term = term.lower()
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394 if self.mode & SLUGIFY_DOT_TO_DASH:
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395 term = re_first_dot_to_dash.sub('', term)
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396 term = re_dot_to_dash.sub('-', term)
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397 if self.mode & SLUGIFY_SPACE_TO_DASH:
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398 term = re_space_to_dash.sub('-', term)
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399 return term
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400
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401
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402 def _parse_slugify_mode(value):
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403 mapping = {
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404 'encode': SLUGIFY_ENCODE,
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405 'transliterate': SLUGIFY_TRANSLITERATE,
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406 'lowercase': SLUGIFY_LOWERCASE,
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407 'dot_to_dash': SLUGIFY_DOT_TO_DASH,
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408 'space_to_dash': SLUGIFY_SPACE_TO_DASH}
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409 mode = 0
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410 for v in value.split(','):
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411 f = mapping.get(v.strip())
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412 if f is None:
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413 if v == 'iconv':
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414 raise Exception("'iconv' is not supported as a slugify mode "
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415 "in PieCrust2. Use 'transliterate'.")
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416 raise Exception("Unknown slugify flag: %s" % v)
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417 mode |= f
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418 return mode
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419