Mercurial > piecrust2

annotate piecrust/data/filters.py @ 182:a54d3c0b5f4a

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tests: Patch `os.path.exists` and improve patching for `open`. You can specify additional modules for which to patch `open`. Also, it was incorrectly updating the opened file, even when it was opened for read only. Now it only updates the contents if the file was opened for write, and supports appending to the end. Last, it supports opening text files in binary mode.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 04 Jan 2015 14:55:41 -0800
parents 474c9882decf
children 4379d8f8f831
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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():
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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))
3
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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