Mercurial > piecrust2

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