pod::escapes.3

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

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.\" ========================================================================
.\"
.IX Title "Pod::Escapes 3"
.TH Pod::Escapes 3 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Pod::Escapes \-\- for resolving Pod E<...> sequences
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 7
\&  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"", $e_node\->label, "\e"!";
\&  }
\&  ...else print/interpolate $text...
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides things that are useful in decoding
Pod E<...> sequences.  Presumably, it should be used
only by Pod parsers and/or formatters.
.PP
By default, Pod::Escapes exports none of its symbols.  But
you can request any of them to be exported.
Either request them individually, as with
\&\f(CW\*(C`use Pod::Escapes qw(symbolname symbolname2...);\*(C'\fR,
or you can do \f(CW\*(C`use Pod::Escapes qw(:ALL);\*(C'\fR to get all
exportable symbols.
.SH "GOODIES"
.IX Header "GOODIES"
.IP "e2char($e_content)" 4
.IX Item "e2char($e_content)"
Given a name or number that could appear in a
\&\f(CW\*(C`E<name_or_num>\*(C'\fR sequence, this returns the string that
it stands for.  For example, \f(CW\*(C`e2char(\*(Aqsol\*(Aq)\*(C'\fR, \f(CW\*(C`e2char(\*(Aq47\*(Aq)\*(C'\fR,
\&\f(CW\*(C`e2char(\*(Aq0x2F\*(Aq)\*(C'\fR, and \f(CW\*(C`e2char(\*(Aq057\*(Aq)\*(C'\fR all return \*(L"/\*(R",
because \f(CW\*(C`E<sol>\*(C'\fR, \f(CW\*(C`E<47>\*(C'\fR, \f(CW\*(C`E<0x2f>\*(C'\fR,
and \f(CW\*(C`E<057>\*(C'\fR, all mean \*(L"/\*(R".  If
the name has no known value (as with a name of \*(L"qacute\*(R") or is
syntactally invalid (as with a name of \*(L"1/4\*(R"), this returns undef.
.IP "e2charnum($e_content)" 4
.IX Item "e2charnum($e_content)"
Given a name or number that could appear in a
\&\f(CW\*(C`E<name_or_num>\*(C'\fR sequence, this returns the number of
the Unicode character that this stands for.  For example,
\&\f(CW\*(C`e2char(\*(Aqsol\*(Aq)\*(C'\fR, \f(CW\*(C`e2char(\*(Aq47\*(Aq)\*(C'\fR,
\&\f(CW\*(C`e2char(\*(Aq0x2F\*(Aq)\*(C'\fR, and \f(CW\*(C`e2char(\*(Aq057\*(Aq)\*(C'\fR all return 47,
because \f(CW\*(C`E<sol>\*(C'\fR, \f(CW\*(C`E<47>\*(C'\fR, \f(CW\*(C`E<0x2f>\*(C'\fR,
and \f(CW\*(C`E<057>\*(C'\fR, all mean \*(L"/\*(R", whose Unicode number is 47.  If
the name has no known value (as with a name of \*(L"qacute\*(R") or is
syntactally invalid (as with a name of \*(L"1/4\*(R"), this returns undef.
.ie n .IP "$Name2character\fR{\fIname}" 4
.el .IP "\f(CW$Name2character\fR{\fIname\fR}" 4
.IX Item "$Name2character{name}"
Maps from names (as in \f(CW\*(C`E<\f(CIname\f(CW>\*(C'\fR) like \*(L"eacute\*(R" or \*(L"sol\*(R"
to the string that each stands for.  Note that this does not
include numerics (like \*(L"64\*(R" or \*(L"x981c\*(R").  Under old Perl versions
(before 5.7) you get a \*(L"?\*(R" in place of characters whose Unicode
value is over 255.
.ie n .IP "$Name2character_number\fR{\fIname}" 4
.el .IP "\f(CW$Name2character_number\fR{\fIname\fR}" 4
.IX Item "$Name2character_number{name}"
Maps from names (as in \f(CW\*(C`E<\f(CIname\f(CW>\*(C'\fR) like \*(L"eacute\*(R" or \*(L"sol\*(R"
to the Unicode value that each stands for.  For example,
\&\f(CW$Name2character_number{\*(Aqeacute\*(Aq}\fR is 201, and
\&\f(CW$Name2character_number{\*(Aqeacute\*(Aq}\fR is 8364.  You get the correct
Unicode value, regardless of the version of Perl you're using \*(--
which differs from \f(CW%Name2character\fR's behavior under pre\-5.7 Perls.
.Sp
Note that this hash does not
include numerics (like \*(L"64\*(R" or \*(L"x981c\*(R").
.ie n .IP "$Latin1Code_to_fallback\fR{\fIinteger}" 4
.el .IP "\f(CW$Latin1Code_to_fallback\fR{\fIinteger\fR}" 4
.IX Item "$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 \*(L"e\*(R").  You may find this useful if you are rendering
\&\s-1POD\s0 in a format that you think deals well only with US-ASCII
characters.
.ie n .IP "$Latin1Char_to_fallback\fR{\fIcharacter}" 4
.el .IP "\f(CW$Latin1Char_to_fallback\fR{\fIcharacter\fR}" 4
.IX Item "$Latin1Char_to_fallback{character}"
Just as above, but maps from characters (like \*(L"\exE9\*(R", 
lowercase e\-acute) to characters (like \*(L"e\*(R").
.ie n .IP "$Code2USASCII\fR{\fIinteger}" 4
.el .IP "\f(CW$Code2USASCII\fR{\fIinteger\fR}" 4
.IX Item "$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 \f(CW\*(C`e2char($x)\*(C'\fR when it senses
that it's running on a non-ASCII platform (where chr(32) doesn't
get you a space \*(-- but \f(CW$Code2USASCII\fR{32} will).  It's
documented here just in case you might find it useful.
.SH "CAVEATS"
.IX Header "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 \*(L"?\*(R".  Latin\-1
characters (characters 160\-255) are unaffected.
.PP
Under \s-1EBCDIC\s0 platforms, \f(CW\*(C`e2char($n)\*(C'\fR may not always be the
same as \f(CW\*(C`chr(e2charnum($n))\*(C'\fR, and ditto for
\&\f(CW$Name2character{$name}\fR and
\&\f(CW\*(C`chr($Name2character_number{$name})\*(C'\fR.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
perlpod
.PP
perlpodspec
.PP
Text::Unidecode
.SH "COPYRIGHT AND DISCLAIMERS"
.IX Header "COPYRIGHT AND DISCLAIMERS"
Copyright (c) 2001\-2004 Sean M. Burke.  All rights reserved.
.PP
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
.PP
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.
.PP
Portions of the data tables in this module are derived from the
entity declarations in the W3C \s-1XHTML\s0 specification.
.PP
Currently (October 2001), that's these three:
.PP
.Vb 3
\& 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
.Ve
.SH "AUTHOR"
.IX Header "AUTHOR"
Sean M. Burke \f(CW\*(C`[e-mail]\*(C'\fR