Mercurial > piecrust2

annotate piecrust/data/iterators.py @ 661:2f780b191541

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internal: Fix a bug with registering taxonomy terms that are not strings. Some objects, like the blog data provider's taxnonomy entries, can render as strings, but are objects themselves. When registering them as "used terms", we need to use their string representation.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 01 Mar 2016 22:26:09 -0800
parents 911a054f4fbd
children e35407c60e00
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 import logging
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2 from piecrust.data.filters import PaginationFilter, IsFilterClause, NotClause
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3 from piecrust.environment import AbortedSourceUseError
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4 from piecrust.events import Event
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5 from piecrust.sources.base import PageSource
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6 from piecrust.sources.interfaces import IPaginationSource
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7
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8
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9 logger = logging.getLogger(__name__)
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10
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11
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12 class SliceIterator(object):
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13 def __init__(self, it, offset=0, limit=-1):
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14 self.it = it
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15 self.offset = offset
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16 self.limit = limit
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17 self.current_page = None
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18 self.has_more = False
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19 self.inner_count = -1
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20 self.next_page = None
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21 self.prev_page = None
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22 self._cache = None
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23
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24 def __iter__(self):
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25 if self._cache is None:
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26 inner_list = list(self.it)
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27 self.inner_count = len(inner_list)
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29 if self.limit > 0:
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30 self.has_more = self.inner_count > (self.offset + self.limit)
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31 self._cache = inner_list[self.offset:self.offset + self.limit]
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32 else:
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33 self.has_more = False
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34 self._cache = inner_list[self.offset:]
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35
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36 if self.current_page:
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37 try:
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38 idx = inner_list.index(self.current_page)
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39 except ValueError:
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40 idx = -1
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41 if idx >= 0:
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42 if idx < self.inner_count - 1:
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43 self.next_page = inner_list[idx + 1]
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44 if idx > 0:
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45 self.prev_page = inner_list[idx - 1]
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46
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47 return iter(self._cache)
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48
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49
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50 class SettingFilterIterator(object):
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51 def __init__(self, it, fil_conf, setting_accessor=None):
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52 self.it = it
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53 self.fil_conf = fil_conf
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54 self._fil = None
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55 self.setting_accessor = setting_accessor
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56
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57 def __iter__(self):
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58 if self._fil is None:
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59 self._fil = PaginationFilter(value_accessor=self.setting_accessor)
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60 self._fil.addClausesFromConfig(self.fil_conf)
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61
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62 for i in self.it:
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63 if self._fil.pageMatches(i):
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64 yield i
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66
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67 class NaturalSortIterator(object):
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68 def __init__(self, it, reverse=False):
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69 self.it = it
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70 self.reverse = reverse
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71
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72 def __iter__(self):
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73 return iter(sorted(self.it, reverse=self.reverse))
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74
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75
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76 class SettingSortIterator(object):
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77 def __init__(self, it, name, reverse=False, value_accessor=None):
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78 self.it = it
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79 self.name = name
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80 self.reverse = reverse
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81 self.value_accessor = value_accessor or self._default_value_accessor
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82
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83 def __iter__(self):
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84 return iter(sorted(self.it, key=self._key_getter,
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85 reverse=self.reverse))
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86
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87 def _key_getter(self, item):
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88 key = self.value_accessor(item, self.name)
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89 if key is None:
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90 return 0
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91 return key
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92
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93 @staticmethod
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94 def _default_value_accessor(item, name):
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95 try:
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96 return getattr(item, name)
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97 except AttributeError:
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98 return None
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100
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101 class PaginationFilterIterator(object):
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102 def __init__(self, it, fil):
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103 self.it = it
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104 self._fil = fil
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105
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106 def __iter__(self):
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107 for page in self.it:
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108 if self._fil.pageMatches(page):
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109 yield page
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111
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112 class PageIterator(object):
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113 debug_render = []
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114 debug_render_doc_dynamic = ['_debugRenderDoc']
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115 debug_render_not_empty = True
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116
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117 def __init__(self, source, current_page=None, pagination_filter=None,
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118 offset=0, limit=-1, locked=False):
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119 self._source = source
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120 self._current_page = current_page
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121 self._locked = False
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122 self._pages = source
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123 self._pagesData = None
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124 self._pagination_slicer = None
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125 self._has_sorter = False
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126 self._next_page = None
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127 self._prev_page = None
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128 self._iter_event = Event()
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129
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130 if isinstance(source, IPaginationSource):
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131 src_it = source.getSourceIterator()
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132 if src_it is not None:
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133 self._pages = src_it
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134
581
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135 # If we're currently baking, apply the default baker filter
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136 # to exclude things like draft posts.
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137 if (isinstance(source, PageSource) and
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138 source.app.config.get('baker/is_baking')):
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139 setting_name = source.app.config.get('baker/no_bake_setting',
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140 'draft')
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141 accessor = self._getSettingAccessor()
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142 draft_filter = PaginationFilter(accessor)
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143 draft_filter.root_clause = NotClause()
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144 draft_filter.root_clause.addClause(
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145 IsFilterClause(setting_name, True))
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146 self._simpleNonSortedWrap(
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147 PaginationFilterIterator, draft_filter)
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148
3
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149 # Apply any filter first, before we start sorting or slicing.
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150 if pagination_filter is not None:
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151 self._simpleNonSortedWrap(PaginationFilterIterator,
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152 pagination_filter)
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153
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154 if offset > 0 or limit > 0:
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155 self.slice(offset, limit)
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156
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157 self._locked = locked
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158
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159 @property
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160 def total_count(self):
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161 self._load()
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162 if self._pagination_slicer is not None:
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163 return self._pagination_slicer.inner_count
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164 return len(self._pagesData)
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165
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166 @property
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167 def next_page(self):
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168 self._load()
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169 return self._next_page
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170
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171 @property
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172 def prev_page(self):
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173 self._load()
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174 return self._prev_page
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175
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176 def __len__(self):
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177 self._load()
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178 return len(self._pagesData)
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179
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180 def __getitem__(self, key):
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181 self._load()
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182 return self._pagesData[key]
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183
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184 def __iter__(self):
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185 self._load()
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186 self._iter_event.fire()
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187 return iter(self._pagesData)
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188
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189 def __getattr__(self, name):
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190 if name[:3] == 'is_' or name[:3] == 'in_':
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191 def is_filter(value):
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192 conf = {'is_%s' % name[3:]: value}
233
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193 accessor = self._getSettingAccessor()
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194 return self._simpleNonSortedWrap(SettingFilterIterator, conf,
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195 accessor)
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196 return is_filter
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197
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198 if name[:4] == 'has_':
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199 def has_filter(value):
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200 conf = {name: value}
233
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201 accessor = self._getSettingAccessor()
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202 return self._simpleNonSortedWrap(SettingFilterIterator, conf,
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203 accessor)
3
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204 return has_filter
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205
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206 if name[:5] == 'with_':
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207 def has_filter(value):
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208 conf = {'has_%s' % name[5:]: value}
233
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209 accessor = self._getSettingAccessor()
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210 return self._simpleNonSortedWrap(SettingFilterIterator, conf,
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211 accessor)
3
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212 return has_filter
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213
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214 return self.__getattribute__(name)
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215
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216 def skip(self, count):
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217 return self._simpleWrap(SliceIterator, count)
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218
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219 def limit(self, count):
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220 return self._simpleWrap(SliceIterator, 0, count)
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221
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222 def slice(self, skip, limit):
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223 return self._simpleWrap(SliceIterator, skip, limit)
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224
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225 def filter(self, filter_name):
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226 if self._current_page is None:
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227 raise Exception("Can't use `filter()` because no parent page was "
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228 "set for this page iterator.")
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229 filter_conf = self._current_page.config.get(filter_name)
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230 if filter_conf is None:
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231 raise Exception("Couldn't find filter '%s' in the configuration "
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232 "header for page: %s" %
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233 (filter_name, self._current_page.path))
233
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234 accessor = self._getSettingAccessor()
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235 return self._simpleNonSortedWrap(SettingFilterIterator, filter_conf,
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236 accessor)
3
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237
10
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238 def sort(self, setting_name=None, reverse=False):
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239 self._ensureUnlocked()
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240 self._unload()
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241 if setting_name is not None:
233
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242 accessor = self._getSettingAccessor()
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243 self._pages = SettingSortIterator(self._pages, setting_name,
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244 reverse, accessor)
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245 else:
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246 self._pages = NaturalSortIterator(self._pages, reverse)
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247 self._has_sorter = True
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248 return self
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249
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250 def reset(self):
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251 self._ensureUnlocked()
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252 self._unload
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253 return self
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254
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255 @property
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256 def _has_more(self):
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257 self._load()
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258 if self._pagination_slicer:
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259 return self._pagination_slicer.has_more
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260 return False
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261
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262 def _simpleWrap(self, it_class, *args, **kwargs):
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263 self._ensureUnlocked()
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264 self._unload()
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265 self._ensureSorter()
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266 self._pages = it_class(self._pages, *args, **kwargs)
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267 if self._pagination_slicer is None and it_class is SliceIterator:
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268 self._pagination_slicer = self._pages
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269 self._pagination_slicer.current_page = self._current_page
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270 return self
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271
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272 def _simpleNonSortedWrap(self, it_class, *args, **kwargs):
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273 self._ensureUnlocked()
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274 self._unload()
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275 self._pages = it_class(self._pages, *args, **kwargs)
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276 return self
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277
233
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278 def _getSettingAccessor(self):
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279 accessor = None
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280 if isinstance(self._source, IPaginationSource):
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281 accessor = self._source.getSettingAccessor()
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282 return accessor
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283
3
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284 def _ensureUnlocked(self):
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285 if self._locked:
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286 raise Exception(
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287 "This page iterator has been locked, probably because "
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288 "you're trying to tamper with pagination data.")
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289
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290 def _ensureSorter(self):
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291 if self._has_sorter:
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292 return
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293 if isinstance(self._source, IPaginationSource):
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294 sort_it = self._source.getSorterIterator(self._pages)
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295 if sort_it is not None:
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296 self._pages = sort_it
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297 self._has_sorter = True
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298
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299 def _unload(self):
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300 self._pagesData = None
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301 self._next_page = None
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302 self._prev_page = None
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303
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304 def _load(self):
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305 if self._pagesData is not None:
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306 return
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307
455
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308 if (self._current_page is not None and
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309 self._current_page.app.env.abort_source_use and
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310 isinstance(self._source, PageSource)):
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311 logger.debug("Aborting iteration from %s." %
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312 self._current_page.ref_spec)
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313 raise AbortedSourceUseError()
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314
3
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315 self._ensureSorter()
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316
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317 it_chain = self._pages
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318 is_pgn_source = False
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319 if isinstance(self._source, IPaginationSource):
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320 is_pgn_source = True
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321 tail_it = self._source.getTailIterator(self._pages)
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322 if tail_it is not None:
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323 it_chain = tail_it
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324
3
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325 self._pagesData = list(it_chain)
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326
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327 if is_pgn_source and self._current_page and self._pagination_slicer:
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328 pn = [self._pagination_slicer.prev_page,
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329 self._pagination_slicer.next_page]
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330 pn_it = self._source.getTailIterator(iter(pn))
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331 self._prev_page, self._next_page = (list(pn_it))
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332
408
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333 def _debugRenderDoc(self):
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334 return "Contains %d items" % len(self)
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335