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annotate venv/lib/python2.7/site-packages/jinja2/tests.py @ 0:d67268158946 draft
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author | bcclaywell |
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date | Mon, 12 Oct 2015 17:43:33 -0400 |
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1 # -*- coding: utf-8 -*- |
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2 """ |
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3 jinja2.tests |
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4 ~~~~~~~~~~~~ |
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5 |
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6 Jinja test functions. Used with the "is" operator. |
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7 |
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8 :copyright: (c) 2010 by the Jinja Team. |
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9 :license: BSD, see LICENSE for more details. |
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10 """ |
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11 import re |
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12 from collections import Mapping |
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13 from jinja2.runtime import Undefined |
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14 from jinja2._compat import text_type, string_types, integer_types |
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15 import decimal |
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16 |
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17 number_re = re.compile(r'^-?\d+(\.\d+)?$') |
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18 regex_type = type(number_re) |
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19 |
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20 |
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21 test_callable = callable |
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22 |
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23 |
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24 def test_odd(value): |
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25 """Return true if the variable is odd.""" |
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26 return value % 2 == 1 |
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27 |
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28 |
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29 def test_even(value): |
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30 """Return true if the variable is even.""" |
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31 return value % 2 == 0 |
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32 |
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33 |
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34 def test_divisibleby(value, num): |
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35 """Check if a variable is divisible by a number.""" |
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36 return value % num == 0 |
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37 |
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38 |
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39 def test_defined(value): |
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40 """Return true if the variable is defined: |
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41 |
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42 .. sourcecode:: jinja |
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43 |
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44 {% if variable is defined %} |
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45 value of variable: {{ variable }} |
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46 {% else %} |
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47 variable is not defined |
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48 {% endif %} |
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49 |
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50 See the :func:`default` filter for a simple way to set undefined |
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51 variables. |
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52 """ |
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53 return not isinstance(value, Undefined) |
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54 |
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55 |
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56 def test_undefined(value): |
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57 """Like :func:`defined` but the other way round.""" |
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58 return isinstance(value, Undefined) |
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59 |
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60 |
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61 def test_none(value): |
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62 """Return true if the variable is none.""" |
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63 return value is None |
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64 |
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65 |
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66 def test_lower(value): |
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67 """Return true if the variable is lowercased.""" |
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68 return text_type(value).islower() |
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69 |
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70 |
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71 def test_upper(value): |
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72 """Return true if the variable is uppercased.""" |
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73 return text_type(value).isupper() |
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74 |
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75 |
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76 def test_string(value): |
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77 """Return true if the object is a string.""" |
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78 return isinstance(value, string_types) |
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79 |
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80 |
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81 def test_mapping(value): |
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82 """Return true if the object is a mapping (dict etc.). |
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83 |
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84 .. versionadded:: 2.6 |
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85 """ |
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86 return isinstance(value, Mapping) |
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87 |
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88 |
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89 def test_number(value): |
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90 """Return true if the variable is a number.""" |
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91 return isinstance(value, integer_types + (float, complex, decimal.Decimal)) |
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92 |
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93 |
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94 def test_sequence(value): |
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95 """Return true if the variable is a sequence. Sequences are variables |
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96 that are iterable. |
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97 """ |
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98 try: |
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99 len(value) |
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100 value.__getitem__ |
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101 except: |
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102 return False |
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103 return True |
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104 |
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105 |
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106 def test_equalto(value, other): |
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107 """Check if an object has the same value as another object: |
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108 |
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109 .. sourcecode:: jinja |
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110 |
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111 {% if foo.expression is equalto 42 %} |
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112 the foo attribute evaluates to the constant 42 |
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113 {% endif %} |
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114 |
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115 This appears to be a useless test as it does exactly the same as the |
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116 ``==`` operator, but it can be useful when used together with the |
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117 `selectattr` function: |
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118 |
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119 .. sourcecode:: jinja |
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120 |
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121 {{ users|selectattr("email", "equalto", "foo@bar.invalid") }} |
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122 |
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123 .. versionadded:: 2.8 |
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124 """ |
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125 return value == other |
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126 |
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127 |
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128 def test_sameas(value, other): |
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129 """Check if an object points to the same memory address than another |
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130 object: |
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131 |
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132 .. sourcecode:: jinja |
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133 |
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134 {% if foo.attribute is sameas false %} |
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135 the foo attribute really is the `False` singleton |
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136 {% endif %} |
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137 """ |
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138 return value is other |
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139 |
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140 |
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141 def test_iterable(value): |
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142 """Check if it's possible to iterate over an object.""" |
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143 try: |
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144 iter(value) |
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145 except TypeError: |
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146 return False |
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147 return True |
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148 |
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149 |
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150 def test_escaped(value): |
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151 """Check if the value is escaped.""" |
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152 return hasattr(value, '__html__') |
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153 |
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154 |
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155 TESTS = { |
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156 'odd': test_odd, |
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157 'even': test_even, |
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158 'divisibleby': test_divisibleby, |
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159 'defined': test_defined, |
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160 'undefined': test_undefined, |
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161 'none': test_none, |
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162 'lower': test_lower, |
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163 'upper': test_upper, |
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164 'string': test_string, |
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165 'mapping': test_mapping, |
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166 'number': test_number, |
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167 'sequence': test_sequence, |
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168 'iterable': test_iterable, |
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169 'callable': test_callable, |
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170 'sameas': test_sameas, |
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171 'equalto': test_equalto, |
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172 'escaped': test_escaped |
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173 } |