Mercurial > piecrust2

annotate piecrust/data/paginator.py @ 5:474c9882decf

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Upgrade to Python 3.
author Ludovic Chabant <ludovic@chabant.com>
date Mon, 11 Aug 2014 22:36:47 -0700
parents f485ba500df3
children f5ca5c5bed85
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rev   line source
3
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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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4 from piecrust.data.filters import PaginationFilter
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5 from piecrust.data.iterators import PageIterator
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6
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7
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8 logger = logging.getLogger(__name__)
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9
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10
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11 class Paginator(object):
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12 debug_render = ['has_more', 'items', 'has_items', 'items_per_page',
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13 'items_this_page', 'prev_page_number', 'this_page_number',
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14 'next_page_number', 'prev_page', 'next_page',
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15 'total_item_count', 'total_page_count',
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16 'next_item', 'prev_item']
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17 debug_render_invoke = ['has_more', 'items', 'has_items', 'items_per_page',
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18 'items_this_page', 'prev_page_number', 'this_page_number',
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19 'next_page_number', 'prev_page', 'next_page',
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20 'total_item_count', 'total_page_count',
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21 'next_item', 'prev_item']
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22
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23 def __init__(self, page, source, uri, page_num=1, pgn_filter=None):
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24 self._parent_page = page
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25 self._source = source
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26 self._uri = uri
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27 self._page_num = page_num
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28 self._iterator = None
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29 self._pgn_filter = pgn_filter
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30 self._pgn_set_on_ctx = False
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31
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32 @property
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33 def is_loaded(self):
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34 return self._iterator is not None
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35
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36 @property
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37 def has_more(self):
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38 return self.next_page_number is not None
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39
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40 @property
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41 def unload(self):
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42 self._iterator = None
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43
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44 # Backward compatibility with PieCrust 1.0 {{{
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45 @property
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46 def posts(self):
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47 return self.items
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48
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49 @property
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50 def has_posts(self):
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51 return self.has_items
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52
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53 @property
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54 def posts_per_page(self):
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55 return self.items_per_page
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56
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57 @property
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58 def posts_this_page(self):
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59 return self.items_this_page
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60
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61 @property
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62 def total_post_count(self):
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63 return self.total_item_count
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64
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65 @property
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66 def next_post(self):
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67 return self.next_item
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68
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69 @property
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70 def prev_post(self):
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71 return self.prev_item
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72 # }}}
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73
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74 @property
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75 def items(self):
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76 self._load()
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77 return self._iterator
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78
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79 @property
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80 def has_items(self):
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81 return self.posts_this_page > 0
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82
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83 @cached_property
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84 def items_per_page(self):
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85 return (self._parent_page.config.get('items_per_page') or
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86 self._source.items_per_page)
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87
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88 @property
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89 def items_this_page(self):
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90 self._load()
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91 return len(self._iterator)
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92
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93 @property
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94 def prev_page_number(self):
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95 if self._page_num > 1:
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96 return self._page_num - 1
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97 return None
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98
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99 @property
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100 def this_page_number(self):
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101 return self._page_num
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102
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103 @property
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104 def next_page_number(self):
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105 self._load()
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106 if self._iterator._has_more:
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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 prev_page(self):
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112 num = self.prev_page_number
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113 if num is not None:
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114 return self._getPageUri(num)
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115 return None
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116
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117 @property
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118 def this_page(self):
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119 return self._getPageUri(self._page_num)
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120
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121 @property
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122 def next_page(self):
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123 num = self.next_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 total_item_count(self):
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130 self._load()
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131 return self._iterator.total_count
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132
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133 @property
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134 def total_page_count(self):
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135 total_count = self.total_item_count
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136 per_page = self.items_per_page
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137 return int(math.ceil(total_count / per_page))
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138
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139 @property
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140 def next_item(self):
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141 self._load()
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142 return self._iterator.prev_page
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143
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144 @property
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145 def prev_item(self):
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146 self._load()
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147 return self._iterator.next_page
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148
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149 def all_page_numbers(self, radius=-1):
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150 total_page_count = self.total_page_count
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151 if total_page_count == 0:
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152 return []
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153
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154 if radius <= 0 or total_page_count < (2 * radius + 1):
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155 return list(range(1, total_page_count))
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156
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157 first_num = self._page_num - radius
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158 last_num = self._page_num + radius
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159 if first_num <= 0:
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160 last_num += 1 - first_num
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161 first_num = 1
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162 elif last_num > total_page_count:
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163 first_num -= (last_num - total_page_count)
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164 last_num = total_page_count
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165 first_num = max(1, first_num)
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166 last_num = min(total_page_count, last_num)
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167 return list(range(first_num, last_num))
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168
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169 def page(self, index):
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170 return self._getPageUri(index)
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171
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172 def _load(self):
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173 if self._iterator is not None:
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174 return
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175
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176 if self._source is None:
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177 raise Exception("Can't load pagination data: no source has been defined.")
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178
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179 pag_filter = self._getPaginationFilter()
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180 offset = (self._page_num - 1) * self.items_per_page
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181 self._iterator = PageIterator(self._source,
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182 current_page=self._parent_page,
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183 pagination_filter=pag_filter,
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184 offset=offset, limit=self.items_per_page,
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185 locked=True)
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186 self._iterator._iter_event += self._onIteration
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187
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188 def _getPaginationFilter(self):
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189 f = PaginationFilter()
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190
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191 if self._pgn_filter is not None:
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192 f.addClause(self._pgn_filter.root_clause)
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193
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194 conf = (self._parent_page.config.get('items_filters') or
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195 self._parent_page.app.config.get('site/items_filters'))
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196 if conf == 'none' or conf == 'nil' or conf == '':
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197 conf = None
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198 if conf is not None:
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199 f.addClausesFromConfig(conf)
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200
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201 return f
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202
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203 def _getPageUri(self, index):
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204 uri = self._uri
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205 if index > 1:
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206 if uri != '':
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207 uri += '/'
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208 uri += str(index)
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209 return uri
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210
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211 def _onIteration(self):
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212 if not self._pgn_set_on_ctx:
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213 eis = self._parent_page.app.env.exec_info_stack
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214 eis.current_page_info.render_ctx.setPagination(self)
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215 self._pgn_set_on_ctx = True
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216