Mercurial > piecrust2

annotate piecrust/data/iterators.py @ 69:cb1ed436642c

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Always use version generated by `setup.py`. Better version generation.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 30 Aug 2014 08:35:26 -0700
parents 53b9df2263dc
children e9dc18a275ff
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3
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1 import logging
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2 from piecrust.data.base import IPaginationSource
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3 from piecrust.data.filters import PaginationFilter
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4 from piecrust.events import Event
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5
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6
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7 logger = logging.getLogger(__name__)
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8
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9
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10 class SliceIterator(object):
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11 def __init__(self, it, offset=0, limit=-1):
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12 self.it = it
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13 self.offset = offset
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14 self.limit = limit
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15 self.current_page = None
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16 self.has_more = False
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17 self.inner_count = -1
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18 self.next_page = None
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19 self.prev_page = None
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20 self._cache = None
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21
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22 def __iter__(self):
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23 if self._cache is None:
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24 inner_list = list(self.it)
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25 self.inner_count = len(inner_list)
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26
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27 if self.limit > 0:
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28 self.has_more = self.inner_count > (self.offset + self.limit)
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29 self._cache = inner_list[self.offset:self.offset + self.limit]
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30 else:
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31 self.has_more = False
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32 self._cache = inner_list[self.offset:]
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33
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34 if self.current_page:
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35 try:
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36 idx = inner_list.index(self.current_page)
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37 except ValueError:
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38 idx = -1
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39 if idx >= 0:
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40 if idx < self.inner_count - 1:
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41 self.next_page = inner_list[idx + 1]
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42 if idx > 0:
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43 self.prev_page = inner_list[idx - 1]
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44
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45 return iter(self._cache)
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46
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47
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48 class SettingFilterIterator(object):
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49 def __init__(self, it, fil_conf, page_accessor=None):
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50 self.it = it
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51 self.fil_conf = fil_conf
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52 self._fil = None
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53 self.page_accessor = page_accessor
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54
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55 def __iter__(self):
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56 if self._fil is None:
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57 self._fil = PaginationFilter()
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58 self._fil.addClausesFromConfig(self.fil_conf)
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59
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60 for i in self.it:
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61 if self.page_accessor:
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62 page = self.page_accessor(i)
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63 else:
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64 page = i
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65 if self._fil.pageMatches(page):
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66 yield i
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67
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68
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69 class NaturalSortIterator(object):
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70 def __init__(self, it, reverse=False):
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71 self.it = it
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72 self.reverse = reverse
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73
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74 def __iter__(self):
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75 return iter(sorted(self.it, reverse=self.reverse))
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76
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77
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78 class SettingSortIterator(object):
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79 def __init__(self, it, name, reverse=False, value_accessor=None):
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80 self.it = it
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81 self.name = name
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82 self.reverse = reverse
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83 self.value_accessor = value_accessor
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84
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85 def __iter__(self):
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86 return iter(sorted(self.it, key=self._key_getter,
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87 reverse=self.reverse))
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88
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89 def _key_getter(self, item):
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90 if self.value_accessor:
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91 return self.value_accessor(item, self.name)
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92 return item.config.get(self.name)
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93
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94
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95 class PaginationFilterIterator(object):
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96 def __init__(self, it, fil):
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97 self.it = it
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98 self._fil = fil
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99
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100 def __iter__(self):
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101 for page in self.it:
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102 if self._fil.pageMatches(page):
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103 yield page
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104
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105
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106 class PageIterator(object):
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107 def __init__(self, source, current_page=None, pagination_filter=None,
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108 offset=0, limit=-1, locked=False):
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109 self._source = source
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110 self._current_page = current_page
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111 self._locked = False
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112 self._pages = source
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113 self._pagesData = None
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114 self._pagination_slicer = None
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115 self._has_sorter = False
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116 self._next_page = None
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117 self._prev_page = None
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118 self._iter_event = Event()
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119
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120 if isinstance(source, IPaginationSource):
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121 src_it = source.getSourceIterator()
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122 if src_it is not None:
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123 self._pages = src_it
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124
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125 # Apply any filter first, before we start sorting or slicing.
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126 if pagination_filter is not None:
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127 self._simpleNonSortedWrap(PaginationFilterIterator,
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128 pagination_filter)
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129
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130 if offset > 0 or limit > 0:
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131 self.slice(offset, limit)
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132
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133 self._locked = locked
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134
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135 @property
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136 def total_count(self):
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137 self._load()
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138 if self._pagination_slicer is not None:
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139 return self._pagination_slicer.inner_count
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140 return len(self._pagesData)
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141
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142 @property
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143 def next_page(self):
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144 self._load()
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145 return self._next_page
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146
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147 @property
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148 def prev_page(self):
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149 self._load()
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150 return self._prev_page
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151
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152 def __len__(self):
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153 self._load()
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154 return len(self._pagesData)
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155
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156 def __getitem__(self, key):
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157 self._load()
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158 return self._pagesData[key]
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159
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160 def __iter__(self):
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161 self._load()
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162 self._iter_event.fire()
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163 return iter(self._pagesData)
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164
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165 def __getattr__(self, name):
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166 if name[:3] == 'is_' or name[:3] == 'in_':
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167 def is_filter(value):
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168 conf = {'is_%s' % name[3:]: value}
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169 return self._simpleNonSortedWrap(SettingFilterIterator, conf)
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170 return is_filter
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171
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172 if name[:4] == 'has_':
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173 def has_filter(value):
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174 conf = {name: value}
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175 return self._simpleNonSortedWrap(SettingFilterIterator, conf)
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176 return has_filter
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177
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178 if name[:5] == 'with_':
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179 def has_filter(value):
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180 conf = {'has_%s' % name[5:]: value}
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181 return self._simpleNonSortedWrap(SettingFilterIterator, conf)
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182 return has_filter
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183
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184 return self.__getattribute__(name)
3
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185
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186 def skip(self, count):
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187 return self._simpleWrap(SliceIterator, count)
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188
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189 def limit(self, count):
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190 return self._simpleWrap(SliceIterator, 0, count)
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191
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192 def slice(self, skip, limit):
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193 return self._simpleWrap(SliceIterator, skip, limit)
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194
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195 def filter(self, filter_name):
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196 if self._current_page is None:
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197 raise Exception("Can't use `filter()` because no parent page was "
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198 "set for this page iterator.")
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199 filter_conf = self._current_page.config.get(filter_name)
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200 if filter_conf is None:
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201 raise Exception("Couldn't find filter '%s' in the configuration "
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202 "header for page: %s" %
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203 (filter_name, self._current_page.path))
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204 return self._simpleNonSortedWrap(SettingFilterIterator, filter_conf)
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205
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cd35d356ccce Fix some bugs with iterators, add some unit tests.
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206 def sort(self, setting_name=None, reverse=False):
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207 self._ensureUnlocked()
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208 self._unload()
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209 if setting_name is not None:
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diff changeset
210 self._pages = SettingSortIterator(self._pages, setting_name,
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diff changeset
211 reverse)
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diff changeset
212 else:
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213 self._pages = NaturalSortIterator(self._pages, reverse)
3
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214 self._has_sorter = True
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215 return self
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216
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217 def reset(self):
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218 self._ensureUnlocked()
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219 self._unload
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220 return self
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221
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222 @property
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223 def _has_more(self):
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224 self._load()
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225 if self._pagination_slicer:
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226 return self._pagination_slicer.has_more
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227 return False
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228
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229 def _simpleWrap(self, it_class, *args, **kwargs):
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230 self._ensureUnlocked()
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231 self._unload()
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232 self._ensureSorter()
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233 self._pages = it_class(self._pages, *args, **kwargs)
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234 if self._pagination_slicer is None and it_class is SliceIterator:
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235 self._pagination_slicer = self._pages
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3a13b43e77c1 Correctly set the current page on a pagination slicer.
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diff changeset
236 self._pagination_slicer.current_page = self._current_page
3
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237 return self
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238
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239 def _simpleNonSortedWrap(self, it_class, *args, **kwargs):
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240 self._ensureUnlocked()
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241 self._unload()
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242 self._pages = it_class(self._pages, *args, **kwargs)
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243 return self
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244
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245 def _ensureUnlocked(self):
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246 if self._locked:
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247 raise Exception(
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248 "This page iterator has been locked, probably because "
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249 "you're trying to tamper with pagination data.")
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250
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251 def _ensureSorter(self):
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252 if self._has_sorter:
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253 return
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diff changeset
254 if isinstance(self._source, IPaginationSource):
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255 sort_it = self._source.getSorterIterator(self._pages)
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diff changeset
256 if sort_it is not None:
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257 self._pages = sort_it
3
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258 self._has_sorter = True
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259
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260 def _unload(self):
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261 self._pagesData = None
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262 self._next_page = None
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263 self._prev_page = None
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264
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265 def _load(self):
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266 if self._pagesData is not None:
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267 return
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268
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269 self._ensureSorter()
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270
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271 it_chain = self._pages
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272 is_pgn_source = False
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273 if isinstance(self._source, IPaginationSource):
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274 is_pgn_source = True
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275 tail_it = self._source.getTailIterator(self._pages)
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276 if tail_it is not None:
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parents: 3
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277 it_chain = tail_it
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278
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279 self._pagesData = list(it_chain)
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280
6
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parents: 3
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281 if is_pgn_source and self._current_page and self._pagination_slicer:
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282 pn = [self._pagination_slicer.prev_page,
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283 self._pagination_slicer.next_page]
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284 pn_it = self._source.getTailIterator(iter(pn))
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285 self._prev_page, self._next_page = (list(pn_it))
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286