escapes.pm

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.

require 5;
#                        The documentation is at the end.
# Time-stamp: "2004-05-07 15:31:25 ADT"
package Pod::Escapes;
require Exporter;
@ISA = ('Exporter');
$VERSION = '1.04';
@EXPORT_OK = qw(
  %Code2USASCII
  %Name2character
  %Name2character_number
  %Latin1Code_to_fallback
  %Latin1Char_to_fallback
  e2char
  e2charnum
);
%EXPORT_TAGS = ('ALL' => \@EXPORT_OK);

#==========================================================================

use strict;
use vars qw(
  %Code2USASCII
  %Name2character
  %Name2character_number
  %Latin1Code_to_fallback
  %Latin1Char_to_fallback
  $FAR_CHAR
  $FAR_CHAR_NUMBER
  $NOT_ASCII
);

$FAR_CHAR = "?" unless defined $FAR_CHAR;
$FAR_CHAR_NUMBER = ord($FAR_CHAR) unless defined $FAR_CHAR_NUMBER;

$NOT_ASCII = 'A' ne chr(65) unless defined $NOT_ASCII;

#--------------------------------------------------------------------------
sub e2char {
  my $in = $_[0];
  return undef unless defined $in and length $in;
  
  # Convert to decimal:
  if($in =~ m/^(0[0-7]*)$/s ) {
    $in = oct $in;
  } elsif($in =~ m/^0?x([0-9a-fA-F]+)$/s ) {
    $in = hex $1;
  } # else it's decimal, or named

  if($NOT_ASCII) {
    # We're in bizarro world of not-ASCII!
    # Cope with US-ASCII codes, use fallbacks for Latin-1, or use FAR_CHAR.
    unless($in =~ m/^\d+$/s) {
      # It's a named character reference.  Get its numeric Unicode value.
      $in = $Name2character{$in};
      return undef unless defined $in;  # (if there's no such name)
      $in = ord $in; # (All ents must be one character long.)
        # ...So $in holds the char's US-ASCII numeric value, which we'll
        #  now go get the local equivalent for.
    }

    # It's numeric, whether by origin or by mutation from a known name
    return $Code2USASCII{$in} # so "65" => "A" everywhere
        || $Latin1Code_to_fallback{$in} # Fallback.
        || $FAR_CHAR; # Fall further back
  }
  
  # Normal handling:
  if($in =~ m/^\d+$/s) {
    if($] < 5.007  and  $in > 255) { # can't be trusted with Unicode
      return $FAR_CHAR;
    } else {
      return chr($in);
    }
  } else {
    return $Name2character{$in}; # returns undef if unknown
  }
}

#--------------------------------------------------------------------------
sub e2charnum {
  my $in = $_[0];
  return undef unless defined $in and length $in;
  
  # Convert to decimal:
  if($in =~ m/^(0[0-7]*)$/s ) {
    $in = oct $in;
  } elsif($in =~ m/^0?x([0-9a-fA-F]+)$/s ) {
    $in = hex $1;
  } # else it's decimal, or named

  if($in =~ m/^\d+$/s) {
    return 0 + $in;
  } else {
    return $Name2character_number{$in}; # returns undef if unknown
  }
}

#--------------------------------------------------------------------------

%Name2character_number = (
 # General XML/XHTML:
 'lt'   => 60,
 'gt'   => 62,
 'quot' => 34,
 'amp'  => 38,
 'apos' => 39,

 # POD-specific:
 'sol'    => 47,
 'verbar' => 124,

 'lchevron' => 171, # legacy for laquo
 'rchevron' => 187, # legacy for raquo

 # Remember, grave looks like \ (as in virtu\)
 #           acute looks like / (as in re/sume/)
 #           circumflex looks like ^ (as in papier ma^che/)
 #           umlaut/dieresis looks like " (as in nai"ve, Chloe")

 # From the XHTML 1 .ent files:
 'nbsp'     , 160,
 'iexcl'    , 161,
 'cent'     , 162,
 'pound'    , 163,
 'curren'   , 164,
 'yen'      , 165,
 'brvbar'   , 166,
 'sect'     , 167,
 'uml'      , 168,
 'copy'     , 169,
 'ordf'     , 170,
 'laquo'    , 171,
 'not'      , 172,
 'shy'      , 173,
 'reg'      , 174,
 'macr'     , 175,
 'deg'      , 176,
 'plusmn'   , 177,
 'sup2'     , 178,
 'sup3'     , 179,
 'acute'    , 180,
 'micro'    , 181,
 'para'     , 182,
 'middot'   , 183,
 'cedil'    , 184,
 'sup1'     , 185,
 'ordm'     , 186,
 'raquo'    , 187,
 'frac14'   , 188,
 'frac12'   , 189,
 'frac34'   , 190,
 'iquest'   , 191,
 'Agrave'   , 192,
 'Aacute'   , 193,
 'Acirc'    , 194,
 'Atilde'   , 195,
 'Auml'     , 196,
 'Aring'    , 197,
 'AElig'    , 198,
 'Ccedil'   , 199,
 'Egrave'   , 200,
 'Eacute'   , 201,
 'Ecirc'    , 202,
 'Euml'     , 203,
 'Igrave'   , 204,
 'Iacute'   , 205,
 'Icirc'    , 206,
 'Iuml'     , 207,
 'ETH'      , 208,
 'Ntilde'   , 209,
 'Ograve'   , 210,
 'Oacute'   , 211,
 'Ocirc'    , 212,
 'Otilde'   , 213,
 'Ouml'     , 214,
 'times'    , 215,
 'Oslash'   , 216,
 'Ugrave'   , 217,
 'Uacute'   , 218,
 'Ucirc'    , 219,
 'Uuml'     , 220,
 'Yacute'   , 221,
 'THORN'    , 222,
 'szlig'    , 223,
 'agrave'   , 224,
 'aacute'   , 225,
 'acirc'    , 226,
 'atilde'   , 227,
 'auml'     , 228,
 'aring'    , 229,
 'aelig'    , 230,
 'ccedil'   , 231,
 'egrave'   , 232,
 'eacute'   , 233,
 'ecirc'    , 234,
 'euml'     , 235,
 'igrave'   , 236,
 'iacute'   , 237,
 'icirc'    , 238,
 'iuml'     , 239,
 'eth'      , 240,
 'ntilde'   , 241,
 'ograve'   , 242,
 'oacute'   , 243,
 'ocirc'    , 244,
 'otilde'   , 245,
 'ouml'     , 246,
 'divide'   , 247,
 'oslash'   , 248,
 'ugrave'   , 249,
 'uacute'   , 250,
 'ucirc'    , 251,
 'uuml'     , 252,
 'yacute'   , 253,
 'thorn'    , 254,
 'yuml'     , 255,

 'fnof'     , 402,
 'Alpha'    , 913,
 'Beta'     , 914,
 'Gamma'    , 915,
 'Delta'    , 916,
 'Epsilon'  , 917,
 'Zeta'     , 918,
 'Eta'      , 919,
 'Theta'    , 920,
 'Iota'     , 921,
 'Kappa'    , 922,
 'Lambda'   , 923,
 'Mu'       , 924,
 'Nu'       , 925,
 'Xi'       , 926,
 'Omicron'  , 927,
 'Pi'       , 928,
 'Rho'      , 929,
 'Sigma'    , 931,
 'Tau'      , 932,
 'Upsilon'  , 933,
 'Phi'      , 934,
 'Chi'      , 935,
 'Psi'      , 936,
 'Omega'    , 937,
 'alpha'    , 945,
 'beta'     , 946,
 'gamma'    , 947,
 'delta'    , 948,
 'epsilon'  , 949,
 'zeta'     , 950,
 'eta'      , 951,
 'theta'    , 952,
 'iota'     , 953,
 'kappa'    , 954,
 'lambda'   , 955,
 'mu'       , 956,
 'nu'       , 957,
 'xi'       , 958,
 'omicron'  , 959,
 'pi'       , 960,
 'rho'      , 961,
 'sigmaf'   , 962,
 'sigma'    , 963,
 'tau'      , 964,
 'upsilon'  , 965,
 'phi'      , 966,
 'chi'      , 967,
 'psi'      , 968,
 'omega'    , 969,
 'thetasym' , 977,
 'upsih'    , 978,
 'piv'      , 982,
 'bull'     , 8226,
 'hellip'   , 8230,
 'prime'    , 8242,
 'Prime'    , 8243,
 'oline'    , 8254,
 'frasl'    , 8260,
 'weierp'   , 8472,
 'image'    , 8465,
 'real'     , 8476,
 'trade'    , 8482,
 'alefsym'  , 8501,
 'larr'     , 8592,
 'uarr'     , 8593,
 'rarr'     , 8594,
 'darr'     , 8595,
 'harr'     , 8596,
 'crarr'    , 8629,
 'lArr'     , 8656,
 'uArr'     , 8657,
 'rArr'     , 8658,
 'dArr'     , 8659,
 'hArr'     , 8660,
 'forall'   , 8704,
 'part'     , 8706,
 'exist'    , 8707,
 'empty'    , 8709,
 'nabla'    , 8711,
 'isin'     , 8712,
 'notin'    , 8713,
 'ni'       , 8715,
 'prod'     , 8719,
 'sum'      , 8721,
 'minus'    , 8722,
 'lowast'   , 8727,
 'radic'    , 8730,
 'prop'     , 8733,
 'infin'    , 8734,
 'ang'      , 8736,
 'and'      , 8743,
 'or'       , 8744,
 'cap'      , 8745,
 'cup'      , 8746,
 'int'      , 8747,
 'there4'   , 8756,
 'sim'      , 8764,
 'cong'     , 8773,
 'asymp'    , 8776,
 'ne'       , 8800,
 'equiv'    , 8801,
 'le'       , 8804,
 'ge'       , 8805,
 'sub'      , 8834,
 'sup'      , 8835,
 'nsub'     , 8836,
 'sube'     , 8838,
 'supe'     , 8839,
 'oplus'    , 8853,
 'otimes'   , 8855,
 'perp'     , 8869,
 'sdot'     , 8901,
 'lceil'    , 8968,
 'rceil'    , 8969,
 'lfloor'   , 8970,
 'rfloor'   , 8971,
 'lang'     , 9001,
 'rang'     , 9002,
 'loz'      , 9674,
 'spades'   , 9824,
 'clubs'    , 9827,
 'hearts'   , 9829,
 'diams'    , 9830,
 'OElig'    , 338,
 'oelig'    , 339,
 'Scaron'   , 352,
 'scaron'   , 353,
 'Yuml'     , 376,
 'circ'     , 710,
 'tilde'    , 732,
 'ensp'     , 8194,
 'emsp'     , 8195,
 'thinsp'   , 8201,
 'zwnj'     , 8204,
 'zwj'      , 8205,
 'lrm'      , 8206,
 'rlm'      , 8207,
 'ndash'    , 8211,
 'mdash'    , 8212,
 'lsquo'    , 8216,
 'rsquo'    , 8217,