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annotate Doc/lib/libstringprep.tex @ 39940:dfd809dcf680 2.5

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Bug #1446043: correctly raise a LookupError if an encoding name given to encodings.search_function() contains a dot. (backport from rev. 52075)
author Georg Brandl <georg@python.org>
date Sat, 30 Sep 2006 11:22:35 +0000
parents 8747bf4b9542
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
28671
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1 \section{\module{stringprep} ---
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2 Internet String Preparation}
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3
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4 \declaremodule{standard}{stringprep}
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5 \modulesynopsis{String preparation, as per RFC 3453}
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6 \moduleauthor{Martin v. L\"owis}{martin@v.loewis.de}
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7 \sectionauthor{Martin v. L\"owis}{martin@v.loewis.de}
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8
36270
8747bf4b9542 added a few missing \versionadded{2.3} tags
Fredrik Lundh <fredrik@pythonware.com>
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9 \versionadded{2.3}
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10
28671
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11 When identifying things (such as host names) in the internet, it is
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12 often necessary to compare such identifications for
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13 ``equality''. Exactly how this comparison is executed may depend on
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14 the application domain, e.g. whether it should be case-insensitive or
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15 not. It may be also necessary to restrict the possible
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16 identifications, to allow only identifications consisting of
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17 ``printable'' characters.
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18
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19 \rfc{3454} defines a procedure for ``preparing'' Unicode strings in
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20 internet protocols. Before passing strings onto the wire, they are
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21 processed with the preparation procedure, after which they have a
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22 certain normalized form. The RFC defines a set of tables, which can be
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23 combined into profiles. Each profile must define which tables it uses,
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24 and what other optional parts of the \code{stringprep} procedure are
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25 part of the profile. One example of a \code{stringprep} profile is
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26 \code{nameprep}, which is used for internationalized domain names.
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27
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28 The module \module{stringprep} only exposes the tables from RFC
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29 3454. As these tables would be very large to represent them as
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30 dictionaries or lists, the module uses the Unicode character database
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31 internally. The module source code itself was generated using the
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32 \code{mkstringprep.py} utility.
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33
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34 As a result, these tables are exposed as functions, not as data
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35 structures. There are two kinds of tables in the RFC: sets and
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36 mappings. For a set, \module{stringprep} provides the ``characteristic
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37 function'', i.e. a function that returns true if the parameter is part
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38 of the set. For mappings, it provides the mapping function: given the
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39 key, it returns the associated value. Below is a list of all functions
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40 available in the module.
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41
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42 \begin{funcdesc}{in_table_a1}{code}
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43 Determine whether \var{code} is in table{A.1} (Unassigned code points
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44 in Unicode 3.2).
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45 \end{funcdesc}
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46
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47 \begin{funcdesc}{in_table_b1}{code}
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48 Determine whether \var{code} is in table{B.1} (Commonly mapped to
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49 nothing).
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50 \end{funcdesc}
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51
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52 \begin{funcdesc}{map_table_b2}{code}
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53 Return the mapped value for \var{code} according to table{B.2}
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54 (Mapping for case-folding used with NFKC).
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55 \end{funcdesc}
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56
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57 \begin{funcdesc}{map_table_b3}{code}
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58 Return the mapped value for \var{code} according to table{B.3}
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59 (Mapping for case-folding used with no normalization).
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60 \end{funcdesc}
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61
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62 \begin{funcdesc}{in_table_c11}{code}
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63 Determine whether \var{code} is in table{C.1.1}
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64 (ASCII space characters).
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65 \end{funcdesc}
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66
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67 \begin{funcdesc}{in_table_c12}{code}
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68 Determine whether \var{code} is in table{C.1.2}
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69 (Non-ASCII space characters).
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70 \end{funcdesc}
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71
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72 \begin{funcdesc}{in_table_c11_c12}{code}
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73 Determine whether \var{code} is in table{C.1}
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74 (Space characters, union of C.1.1 and C.1.2).
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75 \end{funcdesc}
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76
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77 \begin{funcdesc}{in_table_c21}{code}
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78 Determine whether \var{code} is in table{C.2.1}
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79 (ASCII control characters).
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80 \end{funcdesc}
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81
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82 \begin{funcdesc}{in_table_c22}{code}
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83 Determine whether \var{code} is in table{C.2.2}
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84 (Non-ASCII control characters).
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85 \end{funcdesc}
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86
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87 \begin{funcdesc}{in_table_c21_c22}{code}
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88 Determine whether \var{code} is in table{C.2}
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89 (Control characters, union of C.2.1 and C.2.2).
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90 \end{funcdesc}
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91
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92 \begin{funcdesc}{in_table_c3}{code}
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93 Determine whether \var{code} is in table{C.3}
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94 (Private use).
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95 \end{funcdesc}
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96
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97 \begin{funcdesc}{in_table_c4}{code}
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98 Determine whether \var{code} is in table{C.4}
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99 (Non-character code points).
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100 \end{funcdesc}
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101
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102 \begin{funcdesc}{in_table_c5}{code}
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103 Determine whether \var{code} is in table{C.5}
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104 (Surrogate codes).
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105 \end{funcdesc}
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106
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107 \begin{funcdesc}{in_table_c6}{code}
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108 Determine whether \var{code} is in table{C.6}
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109 (Inappropriate for plain text).
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110 \end{funcdesc}
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111
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112 \begin{funcdesc}{in_table_c7}{code}
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113 Determine whether \var{code} is in table{C.7}
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114 (Inappropriate for canonical representation).
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115 \end{funcdesc}
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116
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117 \begin{funcdesc}{in_table_c8}{code}
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118 Determine whether \var{code} is in table{C.8}
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119 (Change display properties or are deprecated).
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120 \end{funcdesc}
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121
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122 \begin{funcdesc}{in_table_c9}{code}
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123 Determine whether \var{code} is in table{C.9}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
parents:
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124 (Tagging characters).
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
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125 \end{funcdesc}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
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126
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
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127 \begin{funcdesc}{in_table_d1}{code}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
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128 Determine whether \var{code} is in table{D.1}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
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129 (Characters with bidirectional property ``R'' or ``AL'').
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
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130 \end{funcdesc}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
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131
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
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132 \begin{funcdesc}{in_table_d2}{code}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
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133 Determine whether \var{code} is in table{D.2}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
parents:
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134 (Characters with bidirectional property ``L'').
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
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135 \end{funcdesc}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
parents:
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136