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annotate piecrust/data/paginator.py @ 316:eb958151c8dc

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tests: Bad me, the tests were broken. Now they're fixed.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 28 Mar 2015 12:41:02 -0700
parents b7ab1b503510
children 498a917cd2d4
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1 import math
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2 import logging
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3 from werkzeug.utils import cached_property
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8c0c53a315ae data: Correctly build pagination filters when we know items are pages.
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4 from piecrust.data.filters import PaginationFilter, page_value_accessor
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5 from piecrust.data.iterators import PageIterator
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f130365568ff internal: Code reorganization to put less stuff in `sources.base`.
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6 from piecrust.sources.interfaces import IPaginationSource
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7
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8
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9 logger = logging.getLogger(__name__)
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10
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11
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12 class Paginator(object):
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13 debug_render = ['has_more', 'items', 'has_items', 'items_per_page',
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14 'items_this_page', 'prev_page_number', 'this_page_number',
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15 'next_page_number', 'prev_page', 'next_page',
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16 'total_item_count', 'total_page_count',
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17 'next_item', 'prev_item']
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18 debug_render_invoke = ['has_more', 'items', 'has_items', 'items_per_page',
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19 'items_this_page', 'prev_page_number', 'this_page_number',
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20 'next_page_number', 'prev_page', 'next_page',
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21 'total_item_count', 'total_page_count',
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22 'next_item', 'prev_item']
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23
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24 def __init__(self, page, source, uri, page_num=1, pgn_filter=None,
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25 items_per_page=-1):
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26 self._parent_page = page
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27 self._source = source
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28 self._uri = uri
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29 self._page_num = page_num
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30 self._iterator = None
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31 self._pgn_filter = pgn_filter
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32 self._items_per_page = items_per_page
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33 self._pgn_set_on_ctx = False
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34
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35 @property
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36 def is_loaded(self):
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37 return self._iterator is not None
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38
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39 @property
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40 def has_more(self):
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41 return self.next_page_number is not None
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42
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43 @property
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44 def unload(self):
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45 self._iterator = None
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46
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47 # Backward compatibility with PieCrust 1.0 {{{
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48 @property
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49 def posts(self):
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50 return self.items
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51
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52 @property
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53 def has_posts(self):
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54 return self.has_items
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55
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56 @property
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57 def posts_per_page(self):
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58 return self.items_per_page
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59
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60 @property
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61 def posts_this_page(self):
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62 return self.items_this_page
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63
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64 @property
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65 def total_post_count(self):
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66 return self.total_item_count
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67
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68 @property
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69 def next_post(self):
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70 return self.next_item
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71
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72 @property
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73 def prev_post(self):
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74 return self.prev_item
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75 # }}}
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76
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77 @property
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78 def items(self):
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79 self._load()
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80 return self._iterator
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81
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82 @property
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83 def has_items(self):
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84 return self.posts_this_page > 0
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85
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86 @cached_property
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87 def items_per_page(self):
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88 if self._items_per_page > 0:
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89 return self._items_per_page
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90 if self._parent_page:
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91 ipp = self._parent_page.config.get('items_per_page')
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92 if ipp is not None:
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93 return ipp
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94 if isinstance(self._source, IPaginationSource):
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95 return self._source.getItemsPerPage()
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96 raise Exception("No way to figure out how many items to display "
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97 "per page.")
3
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98
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99 @property
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100 def items_this_page(self):
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101 self._load()
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102 return len(self._iterator)
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103
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104 @property
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105 def prev_page_number(self):
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106 if self._page_num > 1:
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107 return self._page_num - 1
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108 return None
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109
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110 @property
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111 def this_page_number(self):
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112 return self._page_num
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113
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114 @property
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115 def next_page_number(self):
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116 self._load()
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117 if self._iterator._has_more:
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118 return self._page_num + 1
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119 return None
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120
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121 @property
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122 def prev_page(self):
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123 num = self.prev_page_number
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124 if num is not None:
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125 return self._getPageUri(num)
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126 return None
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127
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128 @property
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129 def this_page(self):
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130 return self._getPageUri(self._page_num)
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131
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132 @property
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133 def next_page(self):
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134 num = self.next_page_number
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135 if num is not None:
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136 return self._getPageUri(num)
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137 return None
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138
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139 @property
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140 def total_item_count(self):
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141 self._load()
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142 return self._iterator.total_count
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143
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144 @property
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145 def total_page_count(self):
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146 total_count = self.total_item_count
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147 per_page = self.items_per_page
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148 return int(math.ceil(total_count / per_page))
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149
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150 @property
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151 def next_item(self):
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152 self._load()
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153 return self._iterator.prev_page
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154
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155 @property
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156 def prev_item(self):
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157 self._load()
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158 return self._iterator.next_page
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159
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160 def all_page_numbers(self, radius=-1):
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161 total_page_count = self.total_page_count
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162 if total_page_count == 0:
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163 return []
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164
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165 if radius <= 0 or total_page_count < (2 * radius + 1):
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166 return list(range(1, total_page_count + 1))
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167
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168 first_num = self._page_num - radius
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169 last_num = self._page_num + radius
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170 if first_num <= 0:
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171 last_num += 1 - first_num
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172 first_num = 1
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173 elif last_num > total_page_count:
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174 first_num -= (last_num - total_page_count)
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175 last_num = total_page_count
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176 first_num = max(1, first_num)
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177 last_num = min(total_page_count, last_num)
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178 return list(range(first_num, last_num + 1))
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179
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180 def page(self, index):
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181 return self._getPageUri(index)
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182
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183 def _load(self):
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184 if self._iterator is not None:
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185 return
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186
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187 if self._source is None:
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188 raise Exception("Can't load pagination data: no source has been defined.")
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189
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190 pag_filter = self._getPaginationFilter()
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191 offset = (self._page_num - 1) * self.items_per_page
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192 self._iterator = PageIterator(self._source,
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193 current_page=self._parent_page,
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194 pagination_filter=pag_filter,
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195 offset=offset, limit=self.items_per_page,
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196 locked=True)
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197 self._iterator._iter_event += self._onIteration
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198
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199 def _getPaginationFilter(self):
280
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200 f = PaginationFilter(value_accessor=page_value_accessor)
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201
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202 if self._pgn_filter is not None:
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203 f.addClause(self._pgn_filter.root_clause)
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204
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205 if isinstance(self._source, IPaginationSource):
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206 sf = self._source.getPaginationFilter(self._parent_page)
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207 if sf is not None:
289
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208 f.addClause(sf.root_clause)
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209
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210 return f
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211
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212 def _getPageUri(self, index):
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213 uri = self._uri
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214 if index > 1:
316
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215 if len(uri) > 0 and not uri.endswith('/'):
3
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216 uri += '/'
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217 uri += str(index)
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218 return uri
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219
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220 def _onIteration(self):
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221 if self._parent_page is not None and not self._pgn_set_on_ctx:
3
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222 eis = self._parent_page.app.env.exec_info_stack
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223 eis.current_page_info.render_ctx.setPagination(self)
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224 self._pgn_set_on_ctx = True
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225