texte)
//
function ajouter_fragments($id_article, $id_version, $fragments) {
global $flag_gz;
$replaces = array();
foreach ($fragments as $id_fragment => $texte) {
$nouveau = true;
// Recuperer la version la plus recente
$query = "SELECT compress, fragment, version_min, version_max FROM spip_versions_fragments ".
"WHERE id_article=$id_article AND id_fragment=$id_fragment AND version_min<=$id_version ".
"ORDER BY version_min DESC LIMIT 0,1";
$result = spip_query($query);
if ($row = spip_fetch_array($result)) {
$fragment = $row['fragment'];
$version_min = $row['version_min'];
if ($row['compress'] > 0) $fragment = gzuncompress($fragment);
$fragment = unserialize($fragment);
if (is_array($fragment)) {
unset($fragment[$id_version]);
// Si moins de cinq revisions distinctes dans le fragment, prolonger celui-ci
if (count($fragment) < 5) $nouveau = false;
}
}
if ($nouveau) {
$fragment = array($id_version => $texte);
$version_min = $id_version;
}
else {
// Ne pas dupliquer les fragments non modifies
$modif = true;
for ($i = $id_version - 1; $i >= $version_min; $i--) {
if (isset($fragment[$i])) {
$modif = ($fragment[$i] != $texte);
break;
}
}
if ($modif) $fragment[$id_version] = $texte;
}
// Preparer l'enregistrement du fragment
$fragment = serialize($fragment);
$compress = 0;
$version_max = $id_version;
if ($flag_gz) {
$s = gzcompress($fragment);
if (strlen($s) < strlen($fragment)) {
//echo "gain gz: ".(100 - 100 * strlen($s) / strlen($fragment))."%
";
$compress = 1;
$fragment = $s;
}
}
// (attention a bien echapper le $fragment qui est en binaire)
$replaces[] = "($id_article, $version_min, $version_max, $id_fragment, $compress, '"
.mysql_escape_string($fragment)."')";
}
if (count($replaces)) {
$query = "REPLACE spip_versions_fragments (id_article, version_min, version_max, id_fragment, compress, fragment) ".
"VALUES ".join(", ", $replaces);
spip_query($query);
}
}
//
// Recuperer les fragments d'une version donnee
// renvoie un tableau associatif (id_fragment => texte)
//
function recuperer_fragments($id_article, $id_version) {
$fragments = array();
$query = "SELECT id_fragment, version_min, compress, fragment FROM spip_versions_fragments ".
"WHERE id_article=$id_article AND version_min<=$id_version AND version_max>=$id_version";
$result = spip_query($query);
while ($row = spip_fetch_array($result)) {
$id_fragment = $row['id_fragment'];
$version_min = $row['version_min'];
$fragment = $row['fragment'];
if ($row['compress'] > 0) $fragment = gzuncompress($fragment);
$fragment = unserialize($fragment);
for ($i = $id_version; $i >= $version_min; $i--) {
if (isset($fragment[$i])) {
$fragments[$id_fragment] = $fragment[$i];
break;
}
}
}
return $fragments;
}
//
// Apparier des paragraphes deux a deux entre une version originale
// et une version modifiee
//
function apparier_paras($src, $dest) {
$src_dest = array();
$dest_src = array();
$t1 = $t2 = array();
$md1 = $md2 = array();
$gz_min1 = $gz_min2 = array();
$gz_trans1 = $gz_trans2 = array();
$l1 = $l2 = array();
// Nettoyage de la ponctuation pour faciliter l'appariement
foreach($src as $key => $val) {
$t1[$key] = preg_replace("/[[:punct:][:space:]]+/", " ", $val);
}
foreach($dest as $key => $val) {
$t2[$key] = preg_replace("/[[:punct:][:space:]]+/", " ", $val);
}
// Hash pour premiere passe
foreach($t1 as $key => $val) $md1[md5($val)] = $key;
foreach($t2 as $key => $val) $md2[md5($val)] = $key;
// Premiere passe : chercher les correspondance exactes
foreach($md1 as $h => $key1) {
if (isset($md2[$h])) {
$key2 = $md2[$h];
if ($t1[$key1] == $t2[$key2]) {
$src_dest[$key1] = $key2;
$dest_src[$key2] = $key1;
unset($t1[$key1]);
unset($t2[$key2]);
}
}
}
// Deuxieme passe : recherche de correlation par test de compressibilite
foreach($t1 as $key => $val) {
$l1[$key] = strlen(gzcompress($val));
}
foreach($t2 as $key => $val) {
$l2[$key] = strlen(gzcompress($val));
}
foreach($t1 as $key1 => $s1) {
//echo "
";
foreach($t2 as $key2 => $s2) {
$r = strlen(gzcompress($s1.$s2));
//$k += strlen($s1) + strlen($s2);
$taux = 1.0 * $r / ($l1[$key1] + $l2[$key2]);
//echo "$key1 => $key2 : $taux";
if (!$gz_min1[$key1] || $gz_min1[$key1] > $taux) {
$gz_min1[$key1] = $taux;
$gz_trans1[$key1] = $key2;
}
if (!$gz_min2[$key2] || $gz_min2[$key2] > $taux) {
$gz_min2[$key2] = $taux;
$gz_trans2[$key2] = $key1;
}
}
}
//echo "$k octets compresses";
// Depouiller les resultats de la deuxieme passe :
// ne retenir que les correlations reciproques
foreach($gz_trans1 as $key1 => $key2) {
if ($gz_trans2[$key2] == $key1 && $gz_min1[$key1] < 0.9) {
$src_dest[$key1] = $key2;
$dest_src[$key2] = $key1;
}
}
/*echo "
";
foreach ($gz_trans1 as $a => $b) {
echo "$a => $b
";
echo "
".$t1[$a]."
";
echo "".$t2[$b]."
";
}
echo "
";
foreach ($gz_trans2 as $b => $a) echo "$a $b
";*/
// Retourner les mappings
return array($src_dest, $dest_src);
}
//
// Recuperer les champs d'une version donnee
//
function recuperer_version($id_article, $id_version) {
$query = "SELECT chapo, texte, ps, extra FROM spip_versions ".
"WHERE id_article=$id_article AND id_version=$id_version";
$result = spip_query($query);
if (!($row = spip_fetch_array($result))) return false;
$codes['chapo'] = $row['chapo'];
$codes['texte'] = $row['texte'];
$codes['ps'] = $row['ps'];
$fragments = recuperer_fragments($id_article, $id_version);
$textes = array();
foreach ($codes as $var => $code) {
$textes[$var] = "";
$code = explode(' ', $code);
foreach ($code as $id_fragment) {
$textes[$var] .= $fragments[$id_fragment];
}
}
return $textes;
}
//
// Ajouter une version a un article
//
function ajouter_version($id_article, $chapo, $texte, $ps, $extra) {
global $connect_id_auteur;
// Eviter les validations entremelees
$lock = "ajout_version $id_article";
spip_get_lock($lock, 5);
// Examiner la derniere version
$query = "SELECT id_version, (id_auteur=$connect_id_auteur AND date > DATE_SUB(NOW(), INTERVAL 1 HOUR) AND permanent!='oui') AS flag ".
"FROM spip_versions WHERE id_article=$id_article ".
"ORDER BY id_version DESC LIMIT 0,1";
$result = spip_query($query);
if ($row = spip_fetch_array($result)) {
$nouveau = !$row['flag'];
$id_version = $row['id_version'];
if ($nouveau) $id_version_new = $id_version + 1;
else $id_version_new = $id_version;
}
else {
$nouveau = true;
$id_version_new = 1;
}
$query = "SELECT id_fragment FROM spip_versions_fragments ".
"WHERE id_article=$id_article ORDER BY id_fragment DESC LIMIT 0,1";
$result = spip_query($query);
if ($row = spip_fetch_array($result))
$id_fragment_next = $row['id_fragment'] + 1;
else
$id_fragment_next = 1;
// Generer les nouveaux fragments
$fragments = array();
$paras_old = recuperer_fragments($id_article, $id_version);
$paras_new = $paras_var = array();
$vars = array('chapo', 'texte', 'ps');
foreach ($vars as $var) {
$codes[$var] = array();
$paras_new = separer_paras($$var, $paras_new);
$paras_var[$var] = count($paras_new);
}
// Apparier les fragments de maniere optimale
$n = count($paras_new);
if ($n) {
list($trans, $trans_rev) = apparier_paras($paras_old, $paras_new);
reset($vars);
$var = '';
for ($i = 0; $i < $n; $i++) {
while ($i >= $paras_var[$var]) list(, $var) = each($vars);
// Lier au fragment existant si possible, sinon creer un nouveau fragment
if (isset($trans_rev[$i])) $id_fragment = $trans_rev[$i];
else $id_fragment = $id_fragment_next++;
$codes[$var][] = $id_fragment;
$fragments[$id_fragment] = $paras_new[$i];
}
}
foreach ($vars as $var) $codes[$var] = join(' ', $codes[$var]);
// Enregistrer les modifications
ajouter_fragments($id_article, $id_version_new, $fragments);
$code_chapo = addslashes($codes['chapo']);
$code_texte = addslashes($codes['texte']);
$code_ps = addslashes($codes['ps']);
if ($nouveau) {
$query = "INSERT spip_versions (id_article, id_version, permanent, date, id_auteur, chapo, texte, ps) ".
"VALUES ($id_article, $id_version_new, 'non', NOW(), '$connect_id_auteur', '$code_chapo', ".
"'$code_texte', '$code_ps')";
spip_query($query);
}
else {
$query = "UPDATE spip_versions SET date=NOW(), id_auteur=$connect_id_auteur, ".
"chapo='$code_chapo', texte='$code_texte', ps='$code_ps' ".
"WHERE id_article=$id_article AND id_version=$id_version";
spip_query($query);
}
$query = "UPDATE spip_articles SET id_version=$id_version_new WHERE id_article=$id_article";
spip_query($query);
spip_release_lock($lock);
return $id_version_new;
}
?>