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Current File : /home/uneseuleoc/www/plugins-dist/revisions/inc/diff.php
<?php

/***************************************************************************\
 *  SPIP, Système de publication pour l'internet                           *
 *                                                                         *
 *  Copyright © avec tendresse depuis 2001                                 *
 *  Arnaud Martin, Antoine Pitrou, Philippe Rivière, Emmanuel Saint-James  *
 *                                                                         *
 *  Ce programme est un logiciel libre distribué sous licence GNU/GPL.     *
\***************************************************************************/

/**
 * Fonctions utilitaires du plugin révisions
 *
 * @package SPIP\Revisions\Diff
 **/

if (!defined('_ECRIRE_INC_VERSION')) {
	return;
}


// LCS (Longest Common Subsequence) en deux versions
// (ref: http://web.archive.org/web/20071206224029/http://www2.toki.or.id/book/AlgDesignManual/BOOK/BOOK5/NODE208.HTM#SECTION03178000000000000000)

/**
 * Calcule un LCS (Longest Common Subsequence) simplifié
 *
 * Chaque chaîne est une permutation de l'autre et on passe en paramètre
 * un des deux tableaux de correspondances
 *
 * @see lcs()
 * @param array $s
 * @return array
 **/
function lcs_opt($s) {
	$n = count($s);
	if (!$n) {
		return [];
	}
	$paths = [];
	$paths_ymin = [];
	$max_len = 0;

	// Insertion des points
	asort($s);
	$max = 400;
	foreach ($s as $y => $c) {
		if ($max-- < 0) {
			break;
		}  # eviter l'explosion memoire des tres gros diff
		for ($len = $max_len; $len > 0; $len--) {
			if ($paths_ymin[$len] < $y) {
				$paths_ymin[$len + 1] = $y;
				$paths[$len + 1] = $paths[$len];
				$paths[$len + 1][$y] = $c;
				break;
			}
		}
		if ($len == 0) {
			$paths_ymin[1] = $y;
			$paths[1] = [$y => $c];
		}
		if ($len + 1 > $max_len) {
			$max_len = $len + 1;
		}
	}

	return $paths[$max_len];
}

/**
 * Calcule un LCS (Longest Common Subsequence)
 *
 * Les deux chaînes n'ont pas été traitées au préalable par la fonction d'appariement
 *
 * @see lcs_opt()
 * @param array $s
 * @param array $t
 * @return array
 **/
function lcs($s, $t) {
	$n = count($s);
	$p = count($t);
	if (!$n || !$p) {
		return [0 => [], 1 => []];
	}
	$paths = [];
	$paths_ymin = [];
	$max_len = 0;
	$s_pos = $t_pos = [];

	// Insertion des points
	foreach ($t as $y => $c) {
		$t_pos[trim($c)][] = $y;
	}

	foreach ($s as $x => $c) {
		$c = trim($c);
		if (!isset($t_pos[$c])) {
			continue;
		}
		krsort($t_pos[$c]);
		foreach ($t_pos[$c] as $y) {
			for ($len = $max_len; $len > 0; $len--) {
				if ($paths_ymin[$len] < $y) {
					$paths_ymin[$len + 1] = $y;
					// On construit le resultat sous forme de chaine d'abord,
					// car les tableaux de PHP sont dispendieux en taille memoire
					$paths[$len + 1] = $paths[$len] . " $x,$y";
					break;
				}
			}
			if ($len + 1 > $max_len) {
				$max_len = $len + 1;
			}
			if ($len == 0) {
				$paths_ymin[1] = $y;
				$paths[1] = "$x,$y";
			}
		}
	}
	if (isset($paths[$max_len]) and $paths[$max_len]) {
		$path = explode(' ', $paths[$max_len]);
		$u = $v = [];
		foreach ($path as $p) {
			[$x, $y] = explode(',', $p);
			$u[$x] = $y;
			$v[$y] = $x;
		}

		return [$u, $v];
	}

	return [0 => [], 1 => []];
}

/**
 * Génération de diff a plusieurs étages
 *
 * @package SPIP\Revisions\Diff
 **/
class Diff {
	/**
	 * Objet DiffX d'un texte ou partie de texte
	 *
	 * @var Object Objet Diff* (DiffTexte, DiffPara, DiffPhrase)
	 */
	public $diff;
	public $fuzzy;

	/**
	 * Constructeur
	 *
	 * @param Object $diff Objet Diff* d'un texte ou morceau de texte
	 **/
	public function __construct($diff) {
		$this->diff = $diff;
		$this->fuzzy = true;
	}

	public function comparer($new, $old) {
		$p_old = null;
		$paras = $this->diff->segmenter($new);
		$paras_old = $this->diff->segmenter($old);
		if ($this->diff->fuzzy()) {
			[$trans_rev, $trans] = apparier_paras($paras_old, $paras);
			$lcs = lcs_opt($trans);
			$lcs_rev = array_flip($lcs);
		} else {
			[$trans_rev, $trans] = lcs($paras_old, $paras);
			$lcs = $trans;
			$lcs_rev = $trans_rev;
		}

		reset($paras_old);
		reset($paras);
		reset($lcs);
		unset($i_old);
		$fin_old = false;
		foreach ($paras as $i => $p) {
			if (!isset($trans[$i])) {
				// Paragraphe ajoute
				$this->diff->ajouter($p);
				continue;
			}
			$j = $trans[$i];
			if (!isset($lcs[$i])) {
				// Paragraphe deplace
				$this->diff->deplacer($p, $paras_old[$j]);
				continue;
			}
			if (!$fin_old) {
				// Paragraphes supprimes jusqu'au paragraphe courant
				if (!isset($i_old)) {
					$i_old = key($paras_old);
					$p_old = current($paras_old);
					next($paras_old);
					if (!$p_old) {
						$fin_old = true;
					}
				}
				while (!$fin_old && $i_old < $j) {
					if (!isset($trans_rev[$i_old])) {
						$this->diff->supprimer($p_old);
					}
					unset($i_old);
					$i_old = key($paras_old);
					$p_old = current($paras_old);
					next($paras_old);
					if (!$p_old) {
						$fin_old = true;
					}
				}
			}
			// Paragraphe n'ayant pas change de place
			$this->diff->comparer($p, $paras_old[$j]);
		}
		// Paragraphes supprimes a la fin du texte
		if (!$fin_old) {
			if (!isset($i_old)) {
				$i_old = key($paras_old);
				$p_old = current($paras_old);
				next($paras_old);
				if (!strlen($p_old)) {
					$fin_old = true;
				}
			}
			while (!$fin_old) {
				if (!isset($trans_rev[$i_old])) {
					$this->diff->supprimer($p_old);
				}
				$i_old = key($paras_old);
				$p_old = current($paras_old);
				next($paras_old);
				if (!$p_old) {
					$fin_old = true;
				}
			}
		}
		if (isset($i_old)) {
			if (!isset($trans_rev[$i_old])) {
				$this->diff->supprimer($p_old);
			}
		}

		return $this->diff->resultat();
	}
}

/**
 * Génération de diff sur un Texte
 *
 * @package SPIP\Revisions\Diff
 **/
class DiffTexte {
	public $r;

	/**
	 * Constructeur
	 **/
	public function __construct() {
		$this->r = '';
	}

	public function _diff($p, $p_old) {
		$diff = new Diff(new DiffPara());

		return $diff->comparer($p, $p_old);
	}

	public function fuzzy() {
		return true;
	}

	/**
	 * Découper les paragraphes d'un texte en fragments
	 *
	 * @param string $texte Texte à fragmenter
	 * @return string[]       Tableau de fragments (paragraphes)
	 **/
	public function segmenter($texte) {
		return separer_paras($texte);
	}

	// NB :  rem=\"diff-\" est un signal pour la fonction "afficher_para_modifies"
	public function ajouter($p) {
		$p = trim($p);
		$this->r .= "\n\n\n<span class=\"diff-para-ajoute\" title=\"" . _T('revisions:diff_para_ajoute') . '">' . $p . '</span rem="diff-">';
	}

	public function supprimer($p_old) {
		$p_old = trim($p_old);
		$this->r .= "\n\n\n<span class=\"diff-para-supprime\" title=\"" . _T('revisions:diff_para_supprime') . '">' . $p_old . '</span rem="diff-">';
	}

	public function deplacer($p, $p_old) {
		$this->r .= "\n\n\n<span class=\"diff-para-deplace\" title=\"" . _T('revisions:diff_para_deplace') . '">';
		$this->r .= trim($this->_diff($p, $p_old));
		$this->r .= '</span rem="diff-">';
	}

	public function comparer($p, $p_old) {
		$this->r .= "\n\n\n" . $this->_diff($p, $p_old);
	}

	public function resultat() {
		return $this->r;
	}
}

/**
 * Génération de diff sur un paragraphe
 *
 * @package SPIP\Revisions\Diff
 **/
class DiffPara {
	public $r;

	/** Constructeur */
	public function __construct() {
		$this->r = '';
	}

	public function _diff($p, $p_old) {
		$diff = new Diff(new DiffPhrase());

		return $diff->comparer($p, $p_old);
	}

	public function fuzzy() {
		return true;
	}

	public function segmenter($texte) {
		$paras = [];
		$texte = trim($texte);
		while (preg_match('/[\.!\?\]]+\s*/u', $texte, $regs)) {
			$p = strpos($texte, (string) $regs[0]) + strlen($regs[0]);
			$paras[] = substr($texte, 0, $p);
			$texte = substr($texte, $p);
		}
		if ($texte) {
			$paras[] = $texte;
		}

		return $paras;
	}

	public function ajouter($p) {
		$this->r .= '<span class="diff-ajoute" title="' . _T('revisions:diff_texte_ajoute') . '">' . $p . '</span rem="diff-">';
	}

	public function supprimer($p_old) {
		$this->r .= '<span class="diff-supprime" title="' . _T('revisions:diff_texte_supprime') . '">' . $p_old . '</span rem="diff-">';
	}

	public function deplacer($p, $p_old) {
		$this->r .= '<span class="diff-deplace" title="' . _T('revisions:diff_texte_deplace') . '">' . $this->_diff(
			$p,
			$p_old
		) . '</span rem="diff-">';
	}

	public function comparer($p, $p_old) {
		$this->r .= $this->_diff($p, $p_old);
	}

	public function resultat() {
		return $this->r;
	}
}

/**
 * Génération de diff sur une phrase
 *
 * @package SPIP\Revisions\Diff
 **/
class DiffPhrase {
	public $r;

	/** Constructeur */
	public function __construct() {
		$this->r = '';
	}

	public function fuzzy() {
		return false;
	}

	public function segmenter($texte) {
		$paras = [];

		$plage_punct_unicode = '\xE2(\x80[\x80-\xBF]|\x81[\x80-\xAF])';
		$punct = '([[:punct:]]|' . $plage_punct_unicode . ')';
		$mode = 'u';

		$preg = '/(' . $punct . '+)(\s+|$)|(\s+)(' . $punct . '*)/' . $mode;
		while (preg_match($preg, $texte, $regs)) {
			$regs = array_pad($regs, 6, '');
			$p = strpos($texte, (string) $regs[0]);
			$l = strlen($regs[0]);
			$punct = $regs[1] ?: $regs[6];
			$milieu = '';
			if ($punct) {
				// notes
				if ($punct == '[[') {
					$avant = substr($texte, 0, $p) . $regs[5] . $punct;
					$texte = $regs[4] . substr($texte, $p + $l);
				} else {
					if ($punct == ']]') {
						$avant = substr($texte, 0, $p) . $regs[5] . $punct;
						$texte = substr($texte, $p + $l);
					} // Attacher les raccourcis fermants au mot precedent
					else {
						if (preg_match(',^[\]}]+$,', $punct)) {
							$avant = substr($texte, 0, $p) . $regs[5] . $punct;
							$texte = $regs[4] . substr($texte, $p + $l);
						} // Attacher les raccourcis ouvrants au mot suivant
						else {
							if (isset($regs[5]) && $regs[5] && preg_match(',^[\[{]+$,', $punct)) {
								$avant = substr($texte, 0, $p) . $regs[5];
								$texte = $punct . substr($texte, $p + $l);
							} // Les autres signes de ponctuation sont des mots a part entiere
							else {
								$avant = substr($texte, 0, $p);
								$milieu = $regs[0];
								$texte = substr($texte, $p + $l);
							}
						}
					}
				}
			} else {
				$avant = substr($texte, 0, $p + $l);
				$texte = substr($texte, $p + $l);
			}
			if ($avant) {
				$paras[] = $avant;
			}
			if ($milieu) {
				$paras[] = $milieu;
			}
		}
		if ($texte) {
			$paras[] = $texte;
		}

		return $paras;
	}

	public function ajouter($p) {
		$this->r .= '<span class="diff-ajoute" title="' . _T('revisions:diff_texte_ajoute') . '">' . $p . '</span rem="diff-"> ';
	}

	public function supprimer($p_old) {
		$this->r .= '<span class="diff-supprime" title="' . _T('revisions:diff_texte_supprime') . '">' . $p_old . '</span rem="diff-"> ';
	}

	public function comparer($p, $p_old) {
		$this->r .= $p;
	}

	public function resultat() {
		return $this->r;
	}
}


function preparer_diff($texte) {
	include_spip('inc/charsets');

	$charset = $GLOBALS['meta']['charset'];
	if ($charset == 'utf-8') {
		return unicode_to_utf_8(html2unicode($texte));
	}

	return unicode_to_utf_8(html2unicode(charset2unicode($texte, $charset, true)));
}

function afficher_diff($texte) {
	$charset = $GLOBALS['meta']['charset'];
	if ($charset == 'utf-8') {
		return $texte;
	}

	return charset2unicode($texte, 'utf-8');
}

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