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Pod::Escapes(3pm) Perl Programmers Reference Guide Pod::Escapes(3pm)
NAME
Pod::Escapes -- for resolving Pod E<...> sequences
SYNOPSIS
use Pod::Escapes qw(e2char);
...la la la, parsing POD, la la la...
$text = e2char($e_node->label);
unless(defined $text) {
print "Unknown E sequence \"", $e_node->label, "\"!";
}
...else print/interpolate $text...
DESCRIPTION
This module provides things that are useful in decoding Pod E<...> sequences. Presumably,
it should be used only by Pod parsers and/or formatters.
By default, Pod::Escapes exports none of its symbols. But you can request any of them to
be exported. Either request them individually, as with "use Pod::Escapes qw(symbolname
symbolname2...);", or you can do "use Pod::Escapes qw(:ALL);" to get all exportable
symbols.
GOODIES
e2char($e_content)
Given a name or number that could appear in a "E<name_or_num>" sequence, this returns
the string that it stands for. For example, "e2char('sol')", "e2char('47')",
"e2char('0x2F')", and "e2char('057')" all return "/", because "E<sol>", "E<47>",
"E<0x2f>", and "E<057>", all mean "/". If the name has no known value (as with a name
of "qacute") or is syntactally invalid (as with a name of "1/4"), this returns undef.
e2charnum($e_content)
Given a name or number that could appear in a "E<name_or_num>" sequence, this returns
the number of the Unicode character that this stands for. For example,
"e2char('sol')", "e2char('47')", "e2char('0x2F')", and "e2char('057')" all return 47,
because "E<sol>", "E<47>", "E<0x2f>", and "E<057>", all mean "/", whose Unicode number
is 47. If the name has no known value (as with a name of "qacute") or is syntactally
invalid (as with a name of "1/4"), this returns undef.
$Name2character{name}
Maps from names (as in "E<name>") like "eacute" or "sol" to the string that each
stands for. Note that this does not include numerics (like "64" or "x981c"). Under
old Perl versions (before 5.7) you get a "?" in place of characters whose Unicode
value is over 255.
$Name2character_number{name}
Maps from names (as in "E<name>") like "eacute" or "sol" to the Unicode value that
each stands for. For example, $Name2character_number{'eacute'} is 201, and
$Name2character_number{'eacute'} is 8364. You get the correct Unicode value,
regardless of the version of Perl you're using -- which differs from %Name2character's
behavior under pre-5.7 Perls.
Note that this hash does not include numerics (like "64" or "x981c").
$Latin1Code_to_fallback{integer}
For numbers in the range 160 (0x00A0) to 255 (0x00FF), this maps from the character
code for a Latin-1 character (like 233 for lowercase e-acute) to the US-ASCII
character that best aproximates it (like "e"). You may find this useful if you are
rendering POD in a format that you think deals well only with US-ASCII characters.
$Latin1Char_to_fallback{character}
Just as above, but maps from characters (like "\xE9", lowercase e-acute) to characters
(like "e").
$Code2USASCII{integer}
This maps from US-ASCII codes (like 32) to the corresponding character (like space,
for 32). Only characters 32 to 126 are defined. This is meant for use by
"e2char($x)" when it senses that it's running on a non-ASCII platform (where chr(32)
doesn't get you a space -- but $Code2USASCII{32} will). It's documented here just in
case you might find it useful.
CAVEATS
On Perl versions before 5.7, Unicode characters with a value over 255 (like lambda or
emdash) can't be conveyed. This module does work under such early Perl versions, but in
the place of each such character, you get a "?". Latin-1 characters (characters 160-255)
are unaffected.
Under EBCDIC platforms, "e2char($n)" may not always be the same as "chr(e2charnum($n))",
and ditto for $Name2character{$name} and "chr($Name2character_number{$name})".
SEE ALSO
perlpod
perlpodspec
Text::Unidecode
COPYRIGHT AND DISCLAIMERS
Copyright (c) 2001-2004 Sean M. Burke. All rights reserved.
This library is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.
This program is distributed in the hope that it will be useful, but without any warranty;
without even the implied warranty of merchantability or fitness for a particular purpose.
Portions of the data tables in this module are derived from the entity declarations in the
W3C XHTML specification.
Currently (October 2001), that's these three:
http://www.w3.org/TR/xhtml1/DTD/xhtml-lat1.ent
http://www.w3.org/TR/xhtml1/DTD/xhtml-special.ent
http://www.w3.org/TR/xhtml1/DTD/xhtml-symbol.ent
AUTHOR
Sean M. Burke "sburke AT cpan.org"
perl v5.16.3 2013-02-26 Pod::Escapes(3pm)
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