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annotate piecrust/data/iterators.py @ 6:f5ca5c5bed85

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More Python 3 fixes, modularization, and new unit tests.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 16 Aug 2014 08:15:30 -0700
parents f485ba500df3
children cd35d356ccce
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rev   line source
3
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1 import logging
6
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2 from piecrust.data.base import IPaginationSource
3
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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 self.has_more = self.inner_count > (self.offset + self.limit)
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27 self._cache = inner_list[self.offset:self.offset + self.limit]
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28 if self.current_page:
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29 idx = inner_list.index(self.current_page)
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30 if idx >= 0:
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31 if idx < self.inner_count - 1:
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32 self.next_page = inner_list[idx + 1]
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33 if idx > 0:
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34 self.prev_page = inner_list[idx - 1]
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35 return iter(self._cache)
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36
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37
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38 class SettingFilterIterator(object):
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39 def __init__(self, it, fil_conf, page_accessor=None):
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40 self.it = it
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41 self.fil_conf = fil_conf
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42 self._fil = None
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43 self.page_accessor = page_accessor
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44
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45 def __iter__(self):
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46 if self._fil is None:
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47 self._fil = PaginationFilter()
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48 self._fil.addClausesFromConfig(self.fil_conf)
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49
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50 for i in self.it:
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51 if self.page_accessor:
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52 page = self.page_accessor(i)
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53 else:
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54 page = i
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55 if self._fil.pageMatches(page):
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56 yield i
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57
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58
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59 class SettingSortIterator(object):
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60 def __init__(self, it, name, reverse=False, value_accessor=None):
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61 self.it = it
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62 self.name = name
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63 self.reverse = reverse
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64 self.value_accessor = value_accessor
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65
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66 def __iter__(self):
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67 def comparer(x, y):
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68 if self.value_accessor:
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69 v1 = self.value_accessor(x, self.name)
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70 v2 = self.value_accessor(y, self.name)
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71 else:
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72 v1 = x.config.get(self.name)
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73 v2 = y.config.get(self.name)
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74
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75 if v1 is None and v2 is None:
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76 return 0
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77 if v1 is None and v2 is not None:
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78 return 1 if self.reverse else -1
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79 if v1 is not None and v2 is None:
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80 return -1 if self.reverse else 1
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81
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82 if v1 == v2:
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83 return 0
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84 if self.reverse:
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85 return 1 if v1 < v2 else -1
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86 else:
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87 return -1 if v1 < v2 else 1
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88
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89 return sorted(self.it, cmp=self._comparer, reverse=self.reverse)
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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
3
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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
6
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181 return self.__getattribute__(name)
3
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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, reverse=False):
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204 self._ensureUnlocked()
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205 self._unload()
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206 self._pages = SettingSortIterator(self._pages, setting_name, reverse)
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207 self._has_sorter = True
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208 return self
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209
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210 def reset(self):
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211 self._ensureUnlocked()
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212 self._unload
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213 return self
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214
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215 @property
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216 def _has_more(self):
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217 self._load()
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218 if self._pagination_slicer:
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219 return self._pagination_slicer.has_more
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220 return False
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221
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222 def _simpleWrap(self, it_class, *args, **kwargs):
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223 self._ensureUnlocked()
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224 self._unload()
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225 self._ensureSorter()
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226 self._pages = it_class(self._pages, *args, **kwargs)
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227 if self._pagination_slicer is None and it_class is SliceIterator:
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228 self._pagination_slicer = self._pages
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229 return self
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230
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231 def _simpleNonSortedWrap(self, it_class, *args, **kwargs):
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232 self._ensureUnlocked()
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233 self._unload()
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234 self._pages = it_class(self._pages, *args, **kwargs)
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235 return self
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236
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237 def _ensureUnlocked(self):
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238 if self._locked:
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239 raise Exception(
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240 "This page iterator has been locked, probably because "
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241 "you're trying to tamper with pagination data.")
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242
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243 def _ensureSorter(self):
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244 if self._has_sorter:
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245 return
6
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246 if isinstance(self._source, IPaginationSource):
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247 sort_it = self._source.getSorterIterator(self._pages)
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248 if sort_it is not None:
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249 self._pages = sort_it
3
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250 self._has_sorter = True
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251
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252 def _unload(self):
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253 self._pagesData = None
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254 self._next_page = None
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255 self._prev_page = None
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256
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257 def _load(self):
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258 if self._pagesData is not None:
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259 return
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260
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261 self._ensureSorter()
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262
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263 it_chain = self._pages
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264 is_pgn_source = False
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265 if isinstance(self._source, IPaginationSource):
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266 is_pgn_source = True
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267 tail_it = self._source.getTailIterator(self._pages)
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268 if tail_it is not None:
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269 it_chain = tail_it
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270
3
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271 self._pagesData = list(it_chain)
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272
6
f5ca5c5bed85 More Python 3 fixes, modularization, and new unit tests.
Ludovic Chabant <ludovic@chabant.com>
parents: 3
diff changeset
273 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
diff changeset
274 pn = [self._pagination_slicer.prev_page,
f5ca5c5bed85 More Python 3 fixes, modularization, and new unit tests.
Ludovic Chabant <ludovic@chabant.com>
parents: 3
diff changeset
275 self._pagination_slicer.next_page]
f5ca5c5bed85 More Python 3 fixes, modularization, and new unit tests.
Ludovic Chabant <ludovic@chabant.com>
parents: 3
diff changeset
276 pn_it = self._source.getTailIterator(iter(pn))
f5ca5c5bed85 More Python 3 fixes, modularization, and new unit tests.
Ludovic Chabant <ludovic@chabant.com>
parents: 3
diff changeset
277 self._prev_page, self._next_page = (list(pn_it))
3
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
278