Mercurial > piecrust2

annotate piecrust/data/filters.py @ 557:703ea5d76f33

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serve: Don't crash when looking at the debug info in a stand-alone window.
author Ludovic Chabant <ludovic@chabant.com>
date Wed, 12 Aug 2015 23:20:16 -0700
parents 8c0c53a315ae
children 08e02c2a2a1a
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3
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1 import logging
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2
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3
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4 logger = logging.getLogger(__name__)
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5
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6
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7 def page_value_accessor(page, name):
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8 return page.config.get(name)
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9
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10
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11 class PaginationFilter(object):
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12 def __init__(self, value_accessor=None):
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13 self.root_clause = None
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14 self.value_accessor = value_accessor or self._default_value_accessor
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15
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16 @property
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17 def is_empty(self):
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18 return self.root_clause is None
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19
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20 def addClause(self, clause):
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21 self._ensureRootClause()
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22 self.root_clause.addClause(clause)
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23
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24 def addClausesFromConfig(self, config):
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25 self._ensureRootClause()
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26 self._addClausesFromConfigRecursive(config, self.root_clause)
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27
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28 def pageMatches(self, page):
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29 if self.root_clause is None:
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30 return True
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31 return self.root_clause.pageMatches(self, page)
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32
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33 def _ensureRootClause(self):
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34 if self.root_clause is None:
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35 self.root_clause = AndBooleanClause()
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36
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37 def _addClausesFromConfigRecursive(self, config, parent_clause):
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38 for key, val in config.items():
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39 if key == 'and':
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40 if not isinstance(val, list) or len(val) == 0:
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41 raise Exception("The given boolean 'AND' filter clause "
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42 "doesn't have an array of child clauses.")
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43 subcl = AndBooleanClause()
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44 parent_clause.addClause(subcl)
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45 for c in val:
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46 self._addClausesFromConfigRecursive(c, subcl)
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47
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48 elif key == 'or':
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49 if not isinstance(val, list) or len(val) == 0:
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50 raise Exception("The given boolean 'OR' filter clause "
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51 "doesn't have an array of child clauses.")
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52 subcl = OrBooleanClause()
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53 parent_clause.addClause(subcl)
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54 for c in val:
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55 self._addClausesFromConfigRecursive(c, subcl)
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56
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57 elif key == 'not':
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58 if isinstance(val, list):
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59 if len(val) != 1:
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60 raise Exception("'NOT' filter clauses must have "
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61 "exactly one child clause.")
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62 val = val[0]
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63 subcl = NotClause()
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64 parent_clause.addClause(subcl)
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65 self._addClausesFromConfigRecursive(val, subcl)
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66
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67 elif key[:4] == 'has_':
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68 setting_name = key[4:]
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69 if isinstance(val, list):
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70 wrappercl = AndBooleanClause()
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71 for c in val:
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72 wrappercl.addClause(HasFilterClause(setting_name, c))
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73 parent_clause.addClause(wrappercl)
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74 else:
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75 parent_clause.addClause(HasFilterClause(setting_name, val))
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76
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77 elif key[:3] == 'is_':
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78 setting_name = key[3:]
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79 parent_clause.addClause(IsFilterClause(setting_name, val))
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80
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81 else:
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82 raise Exception("Unknown filter clause: %s" % key)
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83
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84 @staticmethod
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85 def _default_value_accessor(item, name):
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86 try:
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87 return getattr(item, name)
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88 except AttributeError:
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89 return None
3
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90
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91
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92 class IFilterClause(object):
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93 def addClause(self, clause):
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94 raise NotImplementedError()
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95
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96 def pageMatches(self, fil, page):
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97 raise NotImplementedError()
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98
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99
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100 class NotClause(IFilterClause):
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101 def __init__(self):
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102 self.child = None
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103
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104 def addClause(self, clause):
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105 if self.child is not None:
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106 raise Exception("'NOT' filtering clauses can only have one "
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107 "child clause.")
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108 self.child = clause
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109
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110 def pageMatches(self, fil, page):
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111 if self.child is None:
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112 raise Exception("'NOT' filtering clauses must have one child "
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113 "clause.")
233
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114 return not self.child.pageMatches(fil, page)
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115
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116
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117 class BooleanClause(IFilterClause):
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118 def __init__(self):
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119 self.clauses = []
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120
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121 def addClause(self, clause):
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122 self.clauses.append(clause)
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123
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124
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125 class AndBooleanClause(BooleanClause):
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126 def pageMatches(self, fil, page):
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127 for c in self.clauses:
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128 if not c.pageMatches(fil, page):
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129 return False
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130 return True
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131
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132
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133 class OrBooleanClause(BooleanClause):
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134 def pageMatches(self, fil, page):
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135 for c in self.clauses:
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136 if c.pageMatches(fil, page):
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137 return True
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138 return False
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139
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140
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141 class SettingFilterClause(IFilterClause):
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142 def __init__(self, name, value, coercer=None):
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143 self.name = name
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144 self.value = value
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145 self.coercer = coercer
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146
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147 def addClause(self, clause):
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148 raise Exception("Setting filter clauses can't have child clauses. "
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149 "Use a boolean filter clause instead.")
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150
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151
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152 class HasFilterClause(SettingFilterClause):
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153 def pageMatches(self, fil, page):
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154 actual_value = fil.value_accessor(page, self.name)
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155 if actual_value is None or not isinstance(actual_value, list):
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156 return False
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157
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158 if self.coercer:
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159 actual_value = list(map(self.coercer, actual_value))
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160
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161 return self.value in actual_value
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162
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163
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164 class IsFilterClause(SettingFilterClause):
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165 def pageMatches(self, fil, page):
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166 actual_value = fil.value_accessor(page, self.name)
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167 if self.coercer:
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168 actual_value = self.coercer(actual_value)
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169 return actual_value == self.value
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170