Pod::Escapes(3) Perl Programmers Reference Guide Pod::Escapes(3)NAMEPod::Escapes-- for resolving Pod E<...> sequences
SYNOPSIS
use Pod::Escapesqw(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@cpan.org"
perl v5.10.1 2009-02-12 Pod::Escapes(3)
