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<?php
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/**
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* Config permet de charger automatiquement les fichiers ini du Framework et de l'application.
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* Elle offre l'accès en lecture seule aux paramêtres de config.
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* C'est une Singleton.
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*
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* PHP Version 5
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*
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* @category PHP
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* @package Framework
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* @author Jean-Pascal MILCENT <jpm@tela-botanica.org>
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* @copyright 2009 Tela-Botanica
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* @license GPL-v3 et CECILL-v2
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* @version SVN: <svn_id>
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* @link /doc/framework/
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*/
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class Config {
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private static $instance = null;
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private static $parametres = array();
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private function __construct() {
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// Définition de paramètres avant chargement du config.ini
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self::$parametres = array(
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'fw_fichier_config' => 'config%s.ini',
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'fw_chemin' => dirname(__FILE__).DS
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);
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// Chargement du fichier config.ini du Framework
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self::parserFichierIni(self::$parametres['fw_chemin'].sprintf(self::$parametres['fw_fichier_config'], ''));
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// Chargement du fichier config.ini par défaut de l'application
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$chemin_config_defaut_appli = self::$parametres['chemin_configurations'].sprintf(self::$parametres['fw_fichier_config'], '');
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self::parserFichierIni($chemin_config_defaut_appli);
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// Chargement des fichiers config.ini contextuels
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if (defined('PAP_VERSION')) {
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$chemin_config_appli_contextuel = self::$parametres['chemin_configurations'];
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$chemin_config_appli_contextuel .= sprintf(self::$parametres['fw_fichier_config'], '_papyrus');
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self::parserFichierIni($chemin_config_appli_contextuel);
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}
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}
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private static function parserFichierIni($fichier_ini) {
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$retour = false;
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if (file_exists($fichier_ini)) {
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$ini = parse_ini_file($fichier_ini, true);
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$ini = self::analyserTableauIni($ini);
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self::fusionner($ini);
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$retour = true;
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}
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return $retour;
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}
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private static function fusionner(array $ini) {
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self::$parametres = array_merge(self::$parametres, $ini);
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}
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public static function charger($fichier_ini) {
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self::verifierCreationInstance();
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return self::parserFichierIni($fichier_ini);
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}
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public static function get($param = null) {
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$retour = null;
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self::verifierCreationInstance();
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if ($param === null) {
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$retour = self::$parametres;
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} else {
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$retour = self::getValeur($param, self::$parametres);
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}
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return $retour;
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}
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private static function getValeur($param, $config) {
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if (strpos($param, '.') !== false) {
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$pieces = explode('.', $param, 2);
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if (strlen($pieces[0]) && strlen($pieces[1])) {
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if (isset($config[$pieces[0]])) {
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if (is_array($config[$pieces[0]])) {
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return self::getValeur($pieces[1], $config[$pieces[0]]);
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}
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}
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}
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} else {
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if (isset($config[$param])) {
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return $config[$param];
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}
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}
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return null;
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}
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public static function existe($param) {
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$retour = false;
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self::verifierCreationInstance();
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if (self::getValeur($param, self::$parametres) !== null) {
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$retour = true;
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}
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return $retour;
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}
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private static function verifierCreationInstance() {
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if (empty(self::$instance)) {
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self::$instance = new Config();
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}
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}
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private static function analyserTableauIni($config = array()) {
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foreach ($config as $cle => $valeur) {
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if (is_array($valeur)) {
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$config[$cle] = self::analyserTableauIni($valeur);
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} else {
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self::evaluerReferences($config, $cle);
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self::evaluerPhp($config, $cle);
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self::evaluerCle($config, $cle, $config[$cle]);
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}
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}
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return $config;
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}
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private static function evaluerCle(&$config, $cle, $valeur) {
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if (strpos($cle, '.') !== false) {
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unset($config[$cle]);
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$pieces = explode('.', $cle, 2);
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if (strlen($pieces[0]) && strlen($pieces[1])) {
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if (!isset($config[$pieces[0]])) {
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if ($pieces[0] === '0' && !empty($config)) {
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// convert the current values in $config into an array
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$config = array($pieces[0] => $config);
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} else {
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$config[$pieces[0]] = array();
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}
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} elseif (!is_array($config[$pieces[0]])) {
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throw new ErrorException("Ne peut pas créer de sous-clé pour '{$pieces[0]}' car la clé existe déjà");
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}
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$config[$pieces[0]] = self::evaluerCle($config[$pieces[0]], $pieces[1], $valeur);
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} else {
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throw new ErrorException("Clé invalide '$cle'");
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}
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} else {
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$config[$cle] = $valeur;
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}
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return $config;
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}
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private static function evaluerReferences(&$config, $cle) {
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if (preg_match_all('/{ref:([A-Za-z0-9_-]+)}/', $config[$cle], $correspondances, PREG_SET_ORDER)) {
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foreach ($correspondances as $ref) {
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$config[$cle] = str_replace($ref[0], $config[$ref[1]], $config[$cle]);
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}
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}
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}
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private static function evaluerPhp(&$config, $cle) {
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if (preg_match('/^php:(.+)$/', $config[$cle], $correspondances)) {
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eval('$config["'.$cle.'"] = '.$correspondances[1].';');
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}
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}
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}
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?>
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