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annotate piecrust/data/iterators.py @ 10:cd35d356ccce

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Fix some bugs with iterators, add some unit tests.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 17 Aug 2014 21:18:48 -0700
parents f5ca5c5bed85
children 3a13b43e77c1
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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 idx = inner_list.index(self.current_page)
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36 if idx >= 0:
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37 if idx < self.inner_count - 1:
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38 self.next_page = inner_list[idx + 1]
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39 if idx > 0:
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40 self.prev_page = inner_list[idx - 1]
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41
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42 return iter(self._cache)
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43
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44
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45 class SettingFilterIterator(object):
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46 def __init__(self, it, fil_conf, page_accessor=None):
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47 self.it = it
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48 self.fil_conf = fil_conf
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49 self._fil = None
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50 self.page_accessor = page_accessor
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51
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52 def __iter__(self):
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53 if self._fil is None:
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54 self._fil = PaginationFilter()
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55 self._fil.addClausesFromConfig(self.fil_conf)
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56
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57 for i in self.it:
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58 if self.page_accessor:
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59 page = self.page_accessor(i)
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60 else:
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61 page = i
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62 if self._fil.pageMatches(page):
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63 yield i
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64
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65
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66 class NaturalSortIterator(object):
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67 def __init__(self, it, reverse=False):
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68 self.it = it
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69 self.reverse = reverse
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70
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71 def __iter__(self):
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72 return iter(sorted(self.it, reverse=self.reverse))
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73
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74
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75 class SettingSortIterator(object):
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76 def __init__(self, it, name, reverse=False, value_accessor=None):
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77 self.it = it
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78 self.name = name
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79 self.reverse = reverse
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80 self.value_accessor = value_accessor
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81
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82 def __iter__(self):
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83 return iter(sorted(self.it, key=self._key_getter,
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84 reverse=self.reverse))
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85
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86 def _key_getter(self, item):
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87 if self.value_accessor:
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88 return self.value_accessor(item, self.name)
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89 return item.config.get(self.name)
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90
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91
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92 class PaginationFilterIterator(object):
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93 def __init__(self, it, fil):
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94 self.it = it
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95 self._fil = fil
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96
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97 def __iter__(self):
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98 for page in self.it:
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99 if self._fil.pageMatches(page):
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100 yield page
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101
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102
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103 class PageIterator(object):
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104 def __init__(self, source, current_page=None, pagination_filter=None,
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105 offset=0, limit=-1, locked=False):
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106 self._source = source
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107 self._current_page = current_page
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108 self._locked = False
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109 self._pages = source
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110 self._pagesData = None
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111 self._pagination_slicer = None
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112 self._has_sorter = False
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113 self._next_page = None
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114 self._prev_page = None
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115 self._iter_event = Event()
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116
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117 if isinstance(source, IPaginationSource):
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118 src_it = source.getSourceIterator()
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119 if src_it is not None:
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120 self._pages = src_it
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121
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122 # Apply any filter first, before we start sorting or slicing.
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123 if pagination_filter is not None:
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124 self._simpleNonSortedWrap(PaginationFilterIterator,
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125 pagination_filter)
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126
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127 if offset > 0 or limit > 0:
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128 self.slice(offset, limit)
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129
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130 self._locked = locked
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131
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132 @property
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133 def total_count(self):
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134 self._load()
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135 if self._pagination_slicer is not None:
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136 return self._pagination_slicer.inner_count
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137 return len(self._pagesData)
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138
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139 @property
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140 def next_page(self):
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141 self._load()
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142 return self._next_page
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143
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144 @property
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145 def prev_page(self):
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146 self._load()
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147 return self._prev_page
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148
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149 def __len__(self):
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150 self._load()
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151 return len(self._pagesData)
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152
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153 def __getitem__(self, key):
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154 self._load()
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155 return self._pagesData[key]
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156
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157 def __iter__(self):
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158 self._load()
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159 self._iter_event.fire()
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160 return iter(self._pagesData)
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161
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162 def __getattr__(self, name):
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163 if name[:3] == 'is_' or name[:3] == 'in_':
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164 def is_filter(value):
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165 conf = {'is_%s' % name[3:]: value}
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166 return self._simpleNonSortedWrap(SettingFilterIterator, conf)
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167 return is_filter
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168
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169 if name[:4] == 'has_':
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170 def has_filter(value):
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171 conf = {name: value}
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172 return self._simpleNonSortedWrap(SettingFilterIterator, conf)
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173 return has_filter
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174
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175 if name[:5] == 'with_':
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176 def has_filter(value):
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177 conf = {'has_%s' % name[5:]: value}
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178 return self._simpleNonSortedWrap(SettingFilterIterator, conf)
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179 return has_filter
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180
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181 return self.__getattribute__(name)
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182
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183 def skip(self, count):
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184 return self._simpleWrap(SliceIterator, count)
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185
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186 def limit(self, count):
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187 return self._simpleWrap(SliceIterator, 0, count)
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188
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189 def slice(self, skip, limit):
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190 return self._simpleWrap(SliceIterator, skip, limit)
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191
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192 def filter(self, filter_name):
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193 if self._current_page is None:
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194 raise Exception("Can't use `filter()` because no parent page was "
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195 "set for this page iterator.")
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196 filter_conf = self._current_page.config.get(filter_name)
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197 if filter_conf is None:
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198 raise Exception("Couldn't find filter '%s' in the configuration "
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199 "header for page: %s" %
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200 (filter_name, self._current_page.path))
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201 return self._simpleNonSortedWrap(SettingFilterIterator, filter_conf)
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202
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203 def sort(self, setting_name=None, reverse=False):
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204 self._ensureUnlocked()
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205 self._unload()
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206 if setting_name is not None:
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207 self._pages = SettingSortIterator(self._pages, setting_name,
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208 reverse)
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209 else:
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210 self._pages = NaturalSortIterator(self._pages, reverse)
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211 self._has_sorter = True
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212 return self
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213
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214 def reset(self):
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215 self._ensureUnlocked()
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216 self._unload
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217 return self
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218
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219 @property
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220 def _has_more(self):
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221 self._load()
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222 if self._pagination_slicer:
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223 return self._pagination_slicer.has_more
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224 return False
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225
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226 def _simpleWrap(self, it_class, *args, **kwargs):
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227 self._ensureUnlocked()
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228 self._unload()
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229 self._ensureSorter()
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230 self._pages = it_class(self._pages, *args, **kwargs)
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231 if self._pagination_slicer is None and it_class is SliceIterator:
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232 self._pagination_slicer = self._pages
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233 return self
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234
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235 def _simpleNonSortedWrap(self, it_class, *args, **kwargs):
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236 self._ensureUnlocked()
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237 self._unload()
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238 self._pages = it_class(self._pages, *args, **kwargs)
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239 return self
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240
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241 def _ensureUnlocked(self):
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242 if self._locked:
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243 raise Exception(
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244 "This page iterator has been locked, probably because "
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245 "you're trying to tamper with pagination data.")
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246
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247 def _ensureSorter(self):
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248 if self._has_sorter:
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249 return
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250 if isinstance(self._source, IPaginationSource):
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251 sort_it = self._source.getSorterIterator(self._pages)
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252 if sort_it is not None:
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253 self._pages = sort_it
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254 self._has_sorter = True
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255
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256 def _unload(self):
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257 self._pagesData = None
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258 self._next_page = None
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259 self._prev_page = None
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260
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261 def _load(self):
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262 if self._pagesData is not None:
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263 return
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264
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265 self._ensureSorter()
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266
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267 it_chain = self._pages
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268 is_pgn_source = False
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269 if isinstance(self._source, IPaginationSource):
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270 is_pgn_source = True
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271 tail_it = self._source.getTailIterator(self._pages)
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272 if tail_it is not None:
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parents: 3
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273 it_chain = tail_it
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parents: 3
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274
3
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
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275 self._pagesData = list(it_chain)
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
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276
6
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parents: 3
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277 if is_pgn_source and self._current_page and self._pagination_slicer:
f5ca5c5bed85 More Python 3 fixes, modularization, and new unit tests.
Ludovic Chabant <ludovic@chabant.com>
parents: 3
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278 pn = [self._pagination_slicer.prev_page,
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parents: 3
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279 self._pagination_slicer.next_page]
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Ludovic Chabant <ludovic@chabant.com>
parents: 3
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280 pn_it = self._source.getTailIterator(iter(pn))
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parents: 3
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281 self._prev_page, self._next_page = (list(pn_it))
3
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
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282