Mercurial > piecrust2

annotate piecrust/data/iterators.py @ 3:f485ba500df3

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Gigantic change to basically make PieCrust 2 vaguely functional. - Serving works, with debug window. - Baking works, multi-threading, with dependency handling. - Various things not implemented yet.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 10 Aug 2014 23:43:16 -0700
parents
children f5ca5c5bed85
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rev   line source
3
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
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diff changeset
1 import logging
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2 from piecrust.data.base import PaginationData
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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 DateSortIterator(object):
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93 def __init__(self, it, reverse=True):
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94 self.it = it
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95 self.reverse = reverse
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96
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97 def __iter__(self):
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98 return iter(sorted(self.it,
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99 key=lambda x: x.datetime, reverse=self.reverse))
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100
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101
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102 class PaginationFilterIterator(object):
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103 def __init__(self, it, fil):
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104 self.it = it
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105 self._fil = fil
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106
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107 def __iter__(self):
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108 for page in self.it:
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109 if self._fil.pageMatches(page):
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110 yield page
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111
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112
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113 class SourceFactoryIterator(object):
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114 def __init__(self, source):
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115 self.source = source
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116 self.it = None # This is to permit recursive traversal of the
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117 # iterator chain. It acts as the end.
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118
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119 def __iter__(self):
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120 for factory in self.source.getPageFactories():
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121 yield factory.buildPage()
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122
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123
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124 class PaginationDataBuilderIterator(object):
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125 def __init__(self, it):
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126 self.it = it
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127
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128 def __iter__(self):
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129 for page in self.it:
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130 yield PaginationData(page)
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131
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132
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133 class PageIterator(object):
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134 def __init__(self, source, current_page=None, pagination_filter=None,
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135 offset=0, limit=-1, locked=False):
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136 self._source = source
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137 self._current_page = current_page
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138 self._locked = False
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139 self._pages = SourceFactoryIterator(source)
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140 self._pagesData = None
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141 self._pagination_slicer = None
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142 self._has_sorter = False
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143 self._next_page = None
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144 self._prev_page = None
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145 self._iter_event = Event()
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146
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147 # Apply any filter first, before we start sorting or slicing.
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148 if pagination_filter is not None:
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149 self._simpleNonSortedWrap(PaginationFilterIterator,
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diff changeset
150 pagination_filter)
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151
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152 if offset > 0 or limit > 0:
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153 self.slice(offset, limit)
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154
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155 self._locked = locked
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156
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157 @property
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158 def total_count(self):
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159 self._load()
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160 if self._pagination_slicer is not None:
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161 return self._pagination_slicer.inner_count
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162 return len(self._pagesData)
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163
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164 @property
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165 def next_page(self):
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166 self._load()
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167 return self._next_page
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168
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169 @property
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170 def prev_page(self):
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171 self._load()
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172 return self._prev_page
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173
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174 def __len__(self):
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175 self._load()
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176 return len(self._pagesData)
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177
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178 def __getitem__(self, key):
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179 self._load()
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180 return self._pagesData[key]
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181
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182 def __iter__(self):
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183 self._load()
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184 self._iter_event.fire()
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185 return iter(self._pagesData)
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186
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187 def __getattr__(self, name):
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188 if name[:3] == 'is_' or name[:3] == 'in_':
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189 def is_filter(value):
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190 conf = {'is_%s' % name[3:]: value}
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191 return self._simpleNonSortedWrap(SettingFilterIterator, conf)
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192 return is_filter
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193
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194 if name[:4] == 'has_':
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195 def has_filter(value):
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196 conf = {name: value}
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197 return self._simpleNonSortedWrap(SettingFilterIterator, conf)
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198 return has_filter
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199
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200 if name[:5] == 'with_':
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201 def has_filter(value):
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202 conf = {'has_%s' % name[5:]: value}
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203 return self._simpleNonSortedWrap(SettingFilterIterator, conf)
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204 return has_filter
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205
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206 raise AttributeError()
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207
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208 def skip(self, count):
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209 return self._simpleWrap(SliceIterator, count)
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210
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211 def limit(self, count):
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212 return self._simpleWrap(SliceIterator, 0, count)
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213
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214 def slice(self, skip, limit):
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215 return self._simpleWrap(SliceIterator, skip, limit)
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216
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217 def filter(self, filter_name):
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218 if self._current_page is None:
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diff changeset
219 raise Exception("Can't use `filter()` because no parent page was "
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diff changeset
220 "set for this page iterator.")
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diff changeset
221 filter_conf = self._current_page.config.get(filter_name)
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diff changeset
222 if filter_conf is None:
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diff changeset
223 raise Exception("Couldn't find filter '%s' in the configuration "
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diff changeset
224 "header for page: %s" %
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diff changeset
225 (filter_name, self._current_page.path))
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diff changeset
226 return self._simpleNonSortedWrap(SettingFilterIterator, filter_conf)
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227
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228 def sort(self, setting_name, reverse=False):
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diff changeset
229 self._ensureUnlocked()
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230 self._unload()
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diff changeset
231 self._pages = SettingSortIterator(self._pages, setting_name, reverse)
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diff changeset
232 self._has_sorter = True
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diff changeset
233 return self
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diff changeset
234
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diff changeset
235 def reset(self):
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diff changeset
236 self._ensureUnlocked()
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diff changeset
237 self._unload
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parents:
diff changeset
238 return self
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diff changeset
239
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diff changeset
240 @property
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diff changeset
241 def _has_more(self):
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diff changeset
242 self._load()
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diff changeset
243 if self._pagination_slicer:
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diff changeset
244 return self._pagination_slicer.has_more
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245 return False
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246
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diff changeset
247 def _simpleWrap(self, it_class, *args, **kwargs):
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diff changeset
248 self._ensureUnlocked()
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249 self._unload()
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250 self._ensureSorter()
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diff changeset
251 self._pages = it_class(self._pages, *args, **kwargs)
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252 if self._pagination_slicer is None and it_class is SliceIterator:
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253 self._pagination_slicer = self._pages
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diff changeset
254 return self
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255
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256 def _simpleNonSortedWrap(self, it_class, *args, **kwargs):
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diff changeset
257 self._ensureUnlocked()
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diff changeset
258 self._unload()
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259 self._pages = it_class(self._pages, *args, **kwargs)
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diff changeset
260 return self
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261
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262 def _ensureUnlocked(self):
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diff changeset
263 if self._locked:
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diff changeset
264 raise Exception(
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diff changeset
265 "This page iterator has been locked, probably because "
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
266 "you're trying to tamper with pagination data.")
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parents:
diff changeset
267
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diff changeset
268 def _ensureSorter(self):
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diff changeset
269 if self._has_sorter:
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parents:
diff changeset
270 return
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parents:
diff changeset
271 self._pages = DateSortIterator(self._pages)
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diff changeset
272 self._has_sorter = True
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parents:
diff changeset
273
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diff changeset
274 def _unload(self):
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275 self._pagesData = None
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276 self._next_page = None
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277 self._prev_page = None
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278
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279 def _load(self):
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280 if self._pagesData is not None:
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281 return
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282
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283 self._ensureSorter()
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284
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285 it_chain = PaginationDataBuilderIterator(self._pages)
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286 self._pagesData = list(it_chain)
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287
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288 if self._current_page and self._pagination_slicer:
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289 self._prev_page = PaginationData(self._pagination_slicer.prev_page)
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290 self._next_page = PaginationData(self._pagination_slicer.next_page)
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291