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annotate roundup/anypy/strings.py @ 5955:5dca9925e8a6

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Added tag 2.0.0alpha0 for changeset d7ff9cb70f34
author John Rouillard <rouilj@ieee.org>
date Wed, 23 Oct 2019 14:33:53 -0400
parents bb7865241f8a
children 81990ac0b013
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 _py3 = sys.version_info[0] > 2
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9
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10 import io
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11 if _py3:
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12 StringIO = io.StringIO
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13 else:
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14 StringIO = io.BytesIO
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15
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16 def b2s(b):
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17 """Convert a UTF-8 encoded bytes object to the internal string format."""
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18 if _py3:
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19 return b.decode('utf-8')
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20 else:
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21 return b
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22
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23 def s2b(s):
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24 """Convert a string object to UTF-8 encoded bytes."""
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25 if _py3:
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26 return s.encode('utf-8')
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27 else:
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28 return s
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29
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30 def bs2b(s):
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31 """Convert a string object or UTF-8 encoded bytes to UTF-8 encoded bytes."""
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32 if _py3:
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33 if isinstance(s, bytes):
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34 return s
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35 else:
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36 return s.encode('utf-8')
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37 else:
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38 return s
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39
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40 def s2u(s, errors='strict'):
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41 """Convert a string object to a Unicode string."""
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42 if _py3:
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43 return s
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44 else:
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45 return unicode(s, 'utf-8', errors)
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46
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47 def u2s(u):
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48 """Convert a Unicode string to the internal string format."""
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49 if _py3:
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50 return u
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51 else:
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52 return u.encode('utf-8')
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53
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54 def us2u(s, errors='strict'):
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55 """Convert a string or Unicode string to a Unicode string."""
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56 if _py3:
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57 return s
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58 else:
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59 if isinstance(s, unicode):
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60 return s
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61 else:
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62 return unicode(s, 'utf-8', errors)
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63
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64 def us2s(u):
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65 """Convert a string or Unicode string to the internal string format."""
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66 if _py3:
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67 return u
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68 else:
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69 if isinstance(u, unicode):
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70 return u.encode('utf-8')
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71 else:
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72 return u
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73
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74 def uany2s(u):
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75 """Convert a Unicode string or other object to the internal string format.
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76
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77 Objects that are not Unicode strings are passed to str()."""
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78 if _py3:
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79 return str(u)
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80 else:
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81 if isinstance(u, unicode):
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82 return u.encode('utf-8')
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83 else:
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84 return str(u)
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85
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86 def is_us(s):
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87 """Return whether an object is a string or Unicode string."""
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88 if _py3:
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89 return isinstance(s, str)
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90 else:
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91 return isinstance(s, str) or isinstance(s, unicode)
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92
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93 def uchr(c):
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94 """Return the Unicode string containing the given character."""
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95 if _py3:
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96 return chr(c)
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97 else:
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98 return unichr(c)
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99
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100 # CSV files used for export and import represent strings in the style
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101 # used by repr in Python 2; this means that each byte of the UTF-8
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102 # representation is represented by a \x escape if not a printable
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103 # ASCII character. When such a representation is interpreted by eval
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104 # in Python 3, the effect is that the Unicode characters in the
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105 # resulting string correspond to UTF-8 bytes, so encoding the string
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106 # as ISO-8859-1 produces the correct byte-string which must then be
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107 # decoded as UTF-8 to produce the correct Unicode string. The same
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108 # representations are also used for journal storage in RDBMS
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109 # databases, so that the database can be compatible between Python 2
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110 # and Python 3.
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111
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112 def repr_export(v):
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113 """Return a Python-2-style representation of a value for export to CSV."""
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114 if _py3:
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115 if isinstance(v, str):
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116 return repr(s2b(v))[1:]
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117 elif isinstance(v, dict):
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118 repr_vals = []
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119 for key, value in sorted(v.items()):
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120 repr_vals.append('%s: %s' % (repr_export(key),
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121 repr_export(value)))
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122 return '{%s}' % ', '.join(repr_vals)
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123 else:
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124 return repr(v)
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125 else:
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126 return repr(v)
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127
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128 def eval_import(s):
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129 """Evaluate a Python-2-style value imported from a CSV file."""
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130 if _py3:
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131 v = eval(s)
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132 if isinstance(v, str):
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133 return v.encode('iso-8859-1').decode('utf-8')
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134 elif isinstance(v, dict):
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135 v_mod = {}
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136 for key, value in v.items():
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137 if isinstance(key, str):
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138 key = key.encode('iso-8859-1').decode('utf-8')
bb7865241f8a Make CSV import/export compatible across Python versions (also RDBMS journals) (issue 2550976, issue 2550975).
Joseph Myers <jsm@polyomino.org.uk>
parents: 5492
diff changeset
139 if isinstance(value, str):
bb7865241f8a Make CSV import/export compatible across Python versions (also RDBMS journals) (issue 2550976, issue 2550975).
Joseph Myers <jsm@polyomino.org.uk>
parents: 5492
diff changeset
140 value = value.encode('iso-8859-1').decode('utf-8')
bb7865241f8a Make CSV import/export compatible across Python versions (also RDBMS journals) (issue 2550976, issue 2550975).
Joseph Myers <jsm@polyomino.org.uk>
parents: 5492
diff changeset
141 v_mod[key] = value
bb7865241f8a Make CSV import/export compatible across Python versions (also RDBMS journals) (issue 2550976, issue 2550975).
Joseph Myers <jsm@polyomino.org.uk>
parents: 5492
diff changeset
142 return v_mod
bb7865241f8a Make CSV import/export compatible across Python versions (also RDBMS journals) (issue 2550976, issue 2550975).
Joseph Myers <jsm@polyomino.org.uk>
parents: 5492
diff changeset
143 else:
bb7865241f8a Make CSV import/export compatible across Python versions (also RDBMS journals) (issue 2550976, issue 2550975).
Joseph Myers <jsm@polyomino.org.uk>
parents: 5492
diff changeset
144 return v
bb7865241f8a Make CSV import/export compatible across Python versions (also RDBMS journals) (issue 2550976, issue 2550975).
Joseph Myers <jsm@polyomino.org.uk>
parents: 5492
diff changeset
145 else:
bb7865241f8a Make CSV import/export compatible across Python versions (also RDBMS journals) (issue 2550976, issue 2550975).
Joseph Myers <jsm@polyomino.org.uk>
parents: 5492
diff changeset
146 return eval(s)
Roundup Issue Tracker: http://roundup-tracker.org/