1Pod::Escapes(3pm) Perl Programmers Reference Guide Pod::Escapes(3pm)
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6 Pod::Escapes -- for resolving Pod E<...> sequences
7
9 use Pod::Escapes qw(e2char);
10 ...la la la, parsing POD, la la la...
11 $text = e2char($e_node->label);
12 unless(defined $text) {
13 print "Unknown E sequence \"", $e_node->label, "\"!";
14 }
15 ...else print/interpolate $text...
16
18 This module provides things that are useful in decoding Pod E<...>
19 sequences. Presumably, it should be used only by Pod parsers and/or
20 formatters.
21 By default, Pod::Escapes exports none of its symbols. But you can
23 request any of them to be exported. Either request them individually,
24 as with "use Pod::Escapes qw(symbolname symbolname2...);", or you can
25 do "use Pod::Escapes qw(:ALL);" to get all exportable symbols.
26
28 e2char($e_content)
29 Given a name or number that could appear in a "E<name_or_num>"
30 sequence, this returns the string that it stands for. For example,
31 "e2char('sol')", "e2char('47')", "e2char('0x2F')", and
32 "e2char('057')" all return "/", because "E<sol>", "E<47>",
33 "E<0x2f>", and "E<057>", all mean "/". If the name has no known
34 value (as with a name of "qacute") or is syntactally invalid (as
35 with a name of "1/4"), this returns undef.
36 e2charnum($e_content)
38 Given a name or number that could appear in a "E<name_or_num>"
39 sequence, this returns the number of the Unicode character that
40 this stands for. For example, "e2char('sol')", "e2char('47')",
41 "e2char('0x2F')", and "e2char('057')" all return 47, because
42 "E<sol>", "E<47>", "E<0x2f>", and "E<057>", all mean "/", whose
43 Unicode number is 47. If the name has no known value (as with a
44 name of "qacute") or is syntactally invalid (as with a name of
45 "1/4"), this returns undef.
46 $Name2character{name}
48 Maps from names (as in "E<name>") like "eacute" or "sol" to the
49 string that each stands for. Note that this does not include
50 numerics (like "64" or "x981c"). Under old Perl versions (before
51 5.7) you get a "?" in place of characters whose Unicode value is
52 over 255.
53 $Name2character_number{name}
55 Maps from names (as in "E<name>") like "eacute" or "sol" to the
56 Unicode value that each stands for. For example,
57 $Name2character_number{'eacute'} is 201, and
58 $Name2character_number{'eacute'} is 8364. You get the correct
59 Unicode value, regardless of the version of Perl you're using --
60 which differs from %Name2character's behavior under pre-5.7 Perls.
61 Note that this hash does not include numerics (like "64" or
63 "x981c").
64 $Latin1Code_to_fallback{integer}
66 For numbers in the range 160 (0x00A0) to 255 (0x00FF), this maps
67 from the character code for a Latin-1 character (like 233 for
68 lowercase e-acute) to the US-ASCII character that best aproximates
69 it (like "e"). You may find this useful if you are rendering POD
70 in a format that you think deals well only with US-ASCII
71 characters.
72 $Latin1Char_to_fallback{character}
74 Just as above, but maps from characters (like "\xE9", lowercase
75 e-acute) to characters (like "e").
76 $Code2USASCII{integer}
78 This maps from US-ASCII codes (like 32) to the corresponding
79 character (like space, for 32). Only characters 32 to 126 are
80 defined. This is meant for use by "e2char($x)" when it senses that
81 it's running on a non-ASCII platform (where chr(32) doesn't get you
82 a space -- but $Code2USASCII{32} will). It's documented here just
83 in case you might find it useful.
84
86 On Perl versions before 5.7, Unicode characters with a value over 255
87 (like lambda or emdash) can't be conveyed. This module does work under
88 such early Perl versions, but in the place of each such character, you
89 get a "?". Latin-1 characters (characters 160-255) are unaffected.
90 Under EBCDIC platforms, "e2char($n)" may not always be the same as
92 "chr(e2charnum($n))", and ditto for $Name2character{$name} and
93 "chr($Name2character_number{$name})".
94
96 perlpod
97 perlpodspec
99 Text::Unidecode
101
103 Copyright (c) 2001-2004 Sean M. Burke. All rights reserved.
104 This library is free software; you can redistribute it and/or modify it
106 under the same terms as Perl itself.
107 This program is distributed in the hope that it will be useful, but
109 without any warranty; without even the implied warranty of
110 merchantability or fitness for a particular purpose.
111 Portions of the data tables in this module are derived from the entity
113 declarations in the W3C XHTML specification.
114 Currently (October 2001), that's these three:
116 http://www.w3.org/TR/xhtml1/DTD/xhtml-lat1.ent
118 http://www.w3.org/TR/xhtml1/DTD/xhtml-special.ent
119 http://www.w3.org/TR/xhtml1/DTD/xhtml-symbol.ent
120
122 Sean M. Burke "sburke@cpan.org"
123perl v5.12.4 2011-06-01 Pod::Escapes(3pm)