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annotate roundup/anypy/strings.py @ 7230:8e118eb20d86

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flake8 spacing changes, split multiple imports
author John Rouillard <rouilj@ieee.org>
date Sun, 19 Mar 2023 12:26:42 -0400
parents 82f870433b18
children 417c8ddc98ac
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1 # Roundup represents text internally using the native Python str type.
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2 # In Python 3, these are Unicode strings. In Python 2, these are
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3 # encoded using UTF-8, and the Python 2 unicode type is only used in a
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4 # few places, generally for interacting with external modules
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5 # requiring that type to be used.
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6
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7 import sys
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8 import io
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9
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10 _py3 = sys.version_info[0] > 2
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11
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12 if _py3:
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13 StringIO = io.StringIO
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14 else:
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15 StringIO = io.BytesIO
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16
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17
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18 def b2s(b):
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19 """Convert a UTF-8 encoded bytes object to the internal string format."""
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20 if _py3:
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21 return b.decode('utf-8')
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22 else:
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23 return b
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24
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25
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26 def s2b(s):
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27 """Convert a string object to UTF-8 encoded bytes."""
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28 if _py3:
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29 return s.encode('utf-8')
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30 else:
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31 return s
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32
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33
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34 def bs2b(s):
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35 """Convert a string object or UTF-8 encoded bytes to UTF-8 encoded bytes.
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36 """
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37 if _py3:
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38 if isinstance(s, bytes):
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39 return s
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40 else:
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41 return s.encode('utf-8')
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42 else:
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43 return s
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44
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45
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46 def s2u(s, errors='strict'):
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47 """Convert a string object to a Unicode string."""
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48 if _py3:
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49 return s
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50 else:
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51 return unicode(s, 'utf-8', errors) # noqa: 821
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52
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53
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54 def u2s(u):
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55 """Convert a Unicode string to the internal string format."""
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56 if _py3:
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57 return u
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58 else:
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59 return u.encode('utf-8')
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60
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61
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62 def us2u(s, errors='strict'):
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63 """Convert a string or Unicode string to a Unicode string."""
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64 if _py3:
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65 return s
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66 else:
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67 if isinstance(s, unicode): # noqa: 821
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68 return s
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69 else:
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70 return unicode(s, 'utf-8', errors) # noqa: 821
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71
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72
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73 def us2s(u):
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74 """Convert a string or Unicode string to the internal string format."""
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75 if _py3:
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76 return u
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77 else:
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78 if isinstance(u, unicode): # noqa: 821
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79 return u.encode('utf-8')
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80 else:
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81 return u
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82
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83
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84 def uany2s(u):
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85 """Convert a Unicode string or other object to the internal string format.
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86
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87 Objects that are not Unicode strings are passed to str()."""
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88 if _py3:
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89 return str(u)
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90 else:
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91 if isinstance(u, unicode): # noqa: 821
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92 return u.encode('utf-8')
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93 else:
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94 return str(u)
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95
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96
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97 def is_us(s):
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98 """Return whether an object is a string or Unicode string."""
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99 if _py3:
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100 return isinstance(s, str)
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101 else:
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102 return isinstance(s, str) or isinstance(s, unicode) # noqa: 821
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103
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104
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105 def uchr(c):
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106 """Return the Unicode string containing the given character."""
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107 if _py3:
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108 return chr(c)
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109 else:
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110 return unichr(c) # noqa: 821
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111
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112 # CSV files used for export and import represent strings in the style
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113 # used by repr in Python 2; this means that each byte of the UTF-8
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114 # representation is represented by a \x escape if not a printable
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115 # ASCII character. When such a representation is interpreted by eval
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116 # in Python 3, the effect is that the Unicode characters in the
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117 # resulting string correspond to UTF-8 bytes, so encoding the string
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118 # as ISO-8859-1 produces the correct byte-string which must then be
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119 # decoded as UTF-8 to produce the correct Unicode string. The same
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120 # representations are also used for journal storage in RDBMS
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121 # databases, so that the database can be compatible between Python 2
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122 # and Python 3.
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123
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124
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125 def repr_export(v):
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126 """Return a Python-2-style representation of a value for export to CSV."""
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127 if _py3:
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128 if isinstance(v, str):
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129 return repr(s2b(v))[1:]
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130 elif isinstance(v, dict):
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131 repr_vals = []
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132 for key, value in sorted(v.items()):
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133 repr_vals.append('%s: %s' % (repr_export(key),
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134 repr_export(value)))
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135 return '{%s}' % ', '.join(repr_vals)
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136 else:
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137 return repr(v)
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138 else:
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139 return repr(v)
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140
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141
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142 def eval_import(s):
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143 """Evaluate a Python-2-style value imported from a CSV file."""
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144 if _py3:
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145 try:
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146 v = eval(s)
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147 except SyntaxError:
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148 # handle case where link operation reports id a long int
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149 # ('issue', 5002L, "status") rather than as a string.
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150 # This was a bug that existed and was fixed before or with v1.2.0
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151 import re
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152 v = eval(re.sub(r', ([0-9]+)L,', r', \1,', s))
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153
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154 if isinstance(v, str):
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155 return v.encode('iso-8859-1').decode('utf-8')
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156 elif isinstance(v, dict):
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157 v_mod = {}
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158 for key, value in v.items():
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159 if isinstance(key, str):
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160 key = key.encode('iso-8859-1').decode('utf-8')
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161 if isinstance(value, str):
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162 value = value.encode('iso-8859-1').decode('utf-8')
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163 v_mod[key] = value
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164 return v_mod
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165 else:
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166 return v
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167 else:
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168 return eval(s)
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