<?php

$zcode = <<<BUGGYCODE
<code type="zcode">
<code a="" b="" c="" d="">
<code a="" abc="">
<code abcd="abc" abcdefgh="abcd" abc="abc"></code>

abcdefghijklm
abcdefg
abcdefg
abcdefgh
abcd
abcdefghij
ab
abcd
abcdefghijkl
abcdefghij
abcdefgh
abcdefghijklm
a
abcd
abcdefg
abcdefghij
abcdef
abcd
abcdefg
abcd
abcdefg
abcdefghijk
abcdef
abcdefgh
abcde
abcd
abc
abcd
abcde
abcdefghijk
abc
abcd
abcdef
abcd
abcde
abcd
abcde
abcdefghi
abcde
abcdefg
abcdefg
abcde
abcdefgh
abcdef
abcde
abcdef
abcde
abcdefgh
abcdefghijkl
abcdefghijk
abcdef
abcdefg
abcde
abcd
abc
abc
abcd
abc
abcdef
abcde
abcdefg
abc
abcdef
abcdefgh
abcdef
abcd
abcde
abcdefg
abc
abcdefg
abcdefghijklm
abcdefghijkl
abcd
abcdef
abcd
abcd
abcde
abcdefghij
abcdefg
abcdef
abcd
abcd
abdef
<>
BUGGYCODE;

$balises_c = function($m)
{
    return '<'.$m[1].str_replace('"', '"', $m[2])
        .'>'.$m[3].'</'.$m[1].'>';
};

$balises = 'barre|gras|italique|souligne|attention|erreur|information|question|titre1'
    .'|titre2|exposant|indice|acronyme|lien|email|liste|puce|image|math|couleur'
    .'|police|taille|position|flottant|citation|secret|code|minicode|tableau'
    .'|legende|ligne|entete|cellule';

$remplacements = null;
$zcode = htmlspecialchars($zcode);
do {
    $zcode = preg_replace_callback(
        '`<('.$balises.')'
        .'((?:\s+[A-Za-z_-]+=".*?")*)'
        .'>(.+?)</\\1>`s',
        $balises_c, $zcode, -1, $remplacements);
} while($remplacements);


if(!isset($argv)) header('Content-type: text/plain; charset=utf-8');
echo $zcode;