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annotate piecrust/data/filters.py @ 261:b51ddb0c260b

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tests: Fix linker tests.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 24 Feb 2015 08:04:49 -0800
parents 4379d8f8f831
children 8c0c53a315ae
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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 class PaginationFilter(object):
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8 def __init__(self, value_accessor=None):
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9 self.root_clause = None
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10 self.value_accessor = value_accessor or self._default_value_accessor
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11
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12 @property
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13 def is_empty(self):
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14 return self.root_clause is None
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15
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16 def addClause(self, clause):
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17 self._ensureRootClause()
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18 self.root_clause.addClause(clause)
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19
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20 def addClausesFromConfig(self, config):
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21 self._ensureRootClause()
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22 self._addClausesFromConfigRecursive(config, self.root_clause)
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23
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24 def pageMatches(self, page):
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25 if self.root_clause is None:
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26 return True
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27 return self.root_clause.pageMatches(self, page)
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28
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29 def _ensureRootClause(self):
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30 if self.root_clause is None:
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31 self.root_clause = AndBooleanClause()
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32
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33 def _addClausesFromConfigRecursive(self, config, parent_clause):
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34 for key, val in config.items():
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35 if key == 'and':
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36 if not isinstance(val, list) or len(val) == 0:
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37 raise Exception("The given boolean 'AND' filter clause "
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38 "doesn't have an array of child clauses.")
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39 subcl = AndBooleanClause()
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40 parent_clause.addClause(subcl)
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41 for c in val:
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42 self._addClausesFromConfigRecursive(c, subcl)
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43
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44 elif key == 'or':
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45 if not isinstance(val, list) or len(val) == 0:
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46 raise Exception("The given boolean 'OR' filter clause "
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47 "doesn't have an array of child clauses.")
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48 subcl = OrBooleanClause()
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49 parent_clause.addClause(subcl)
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50 for c in val:
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51 self._addClausesFromConfigRecursive(c, subcl)
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52
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53 elif key == 'not':
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54 if isinstance(val, list):
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55 if len(val) != 1:
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56 raise Exception("'NOT' filter clauses must have "
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57 "exactly one child clause.")
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58 val = val[0]
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59 subcl = NotClause()
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60 parent_clause.addClause(subcl)
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61 self._addClausesFromConfigRecursive(val, subcl)
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62
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63 elif key[:4] == 'has_':
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64 setting_name = key[4:]
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65 if isinstance(val, list):
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66 wrappercl = AndBooleanClause()
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67 for c in val:
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68 wrappercl.addClause(HasFilterClause(setting_name, c))
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69 parent_clause.addClause(wrappercl)
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70 else:
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71 parent_clause.addClause(HasFilterClause(setting_name, val))
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72
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73 elif key[:3] == 'is_':
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74 setting_name = key[3:]
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75 parent_clause.addClause(IsFilterClause(setting_name, val))
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76
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77 else:
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78 raise Exception("Unknown filter clause: %s" % key)
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79
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80 @staticmethod
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81 def _default_value_accessor(item, name):
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82 try:
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83 return getattr(item, name)
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84 except AttributeError:
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85 return None
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86
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87
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88 class IFilterClause(object):
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89 def addClause(self, clause):
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90 raise NotImplementedError()
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91
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92 def pageMatches(self, fil, page):
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93 raise NotImplementedError()
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94
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95
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96 class NotClause(IFilterClause):
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97 def __init__(self):
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98 self.child = None
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99
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100 def addClause(self, clause):
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101 if self.child is not None:
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102 raise Exception("'NOT' filtering clauses can only have one "
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103 "child clause.")
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104 self.child = clause
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105
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106 def pageMatches(self, fil, page):
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107 if self.child is None:
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108 raise Exception("'NOT' filtering clauses must have one child "
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109 "clause.")
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110 return not self.child.pageMatches(fil, page)
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111
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112
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113 class BooleanClause(IFilterClause):
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114 def __init__(self):
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115 self.clauses = []
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116
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117 def addClause(self, clause):
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118 self.clauses.append(clause)
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119
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120
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121 class AndBooleanClause(BooleanClause):
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122 def pageMatches(self, fil, page):
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123 for c in self.clauses:
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124 if not c.pageMatches(fil, page):
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125 return False
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126 return True
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127
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128
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129 class OrBooleanClause(BooleanClause):
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130 def pageMatches(self, fil, page):
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131 for c in self.clauses:
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132 if c.pageMatches(fil, page):
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133 return True
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134 return False
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135
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136
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137 class SettingFilterClause(IFilterClause):
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138 def __init__(self, name, value, coercer=None):
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139 self.name = name
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140 self.value = value
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141 self.coercer = coercer
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142
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143 def addClause(self, clause):
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144 raise Exception("Setting filter clauses can't have child clauses. "
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145 "Use a boolean filter clause instead.")
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146
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147
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148 class HasFilterClause(SettingFilterClause):
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149 def pageMatches(self, fil, page):
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150 actual_value = fil.value_accessor(page, self.name)
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151 if actual_value is None or not isinstance(actual_value, list):
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152 return False
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153
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154 if self.coercer:
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155 actual_value = list(map(self.coercer, actual_value))
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156
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157 return self.value in actual_value
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158
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159
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160 class IsFilterClause(SettingFilterClause):
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161 def pageMatches(self, fil, page):
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162 actual_value = fil.value_accessor(page, self.name)
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163 if self.coercer:
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164 actual_value = self.coercer(actual_value)
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165 return actual_value == self.value
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166