WebSVN – Sites.tela-botanica.org – /trunk/actu/ecrire/inc

<?php

//
// Ce fichier ne sera execute qu'une fois
if (defined("_ECRIRE_INC_DIFF")) return;
define("_ECRIRE_INC_DIFF", "1");



function separer_paras($texte, $paras = "") {
        if (!$paras) $paras = array();
        while (preg_match("/(\r\n?){2,}|\n{2,}/", $texte, $regs)) {
                $p = strpos($texte, $regs[0]) + strlen($regs[0]);
                $paras[] = substr($texte, 0, $p);
                $texte = substr($texte, $p);
        }
        if ($texte) $paras[] = $texte;
        return $paras;
}

//
// Ajouter les fragments de la derniere version (tableau associatif id_fragment => 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))."%<br>";
                                $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 => $s1) {
                //echo "<br>";
                foreach($t2 as $key2 => $s2) {
                        $r = strlen(gzcompress($s1.$s2));
                        //$k += strlen($s1) + strlen($s2);
                        $taux = 1.0 * $r / ($l1[$key1] + $l2[$key2]);
                        //echo "<li>$key1 => $key2 : $taux</li>";
                        if (!$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<p>";
        
        // 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 "<br>";
        foreach ($gz_trans1 as $a => $b) {
                echo "$a => $b<br>";
                echo "<blockquote><div style='border: 1px solid black'>".$t1[$a]."</div>";
                echo "<div style='border: 1px solid black'>".$t2[$b]."</div></blockquote>";
        }
        echo "<br>";
        foreach ($gz_trans2 as $b => $a) echo "$a $b<br>";*/

        // 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;
}


?>
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