added first cut of template parser

htdocs/lib/template.php

+<?php
+/**
+ * This program is part of Mahara
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ *
+ * @package    mahara
+ * @subpackage core
+ * @author     Penny Leach <penny@catalyst.net.nz>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL
+ * @copyright  (C) 2006,2007 Catalyst IT Ltd http://catalyst.net.nz
+ *
+ */
+
+defined('INTERNAL') || die();
+
+function template_parse($templatename) {
+
+    $t = array();
+    
+    $template = template_locate($templatename);
+    $template = $template[0]; // we don't care about css right now
+
+    $fragment = file_get_contents($template);
+
+    preg_match_all('/(.*?)\{\{(.*?)\}\}/xms', $fragment, $matches, PREG_SET_ORDER);
+    
+    $strlen = 0;
+
+    foreach ($matches as $m) {
+        $temp = array('type'    => 'html',
+                      'content' => $m[1],
+                      );
+        $t[] = $temp;
+        $temp = array('type'    => 'block', 
+                      'data'    => template_parse_block($m[2]),
+                      );
+        $t[] = $temp;
+
+        $strlen += strlen($m[0]);
+           
+    }
+   
+    $temp = array('type'    => 'html',
+                  'content' => substr($fragment, $strlen),
+                  );
+
+    $t[] = $temp;
+
+    return $t;
+}
+
+function template_parse_block($blockstr) {
+    $data = array();
+    $bits = explode(' ', $blockstr);
+
+    // the first bit should be 'block'
+    if ($bits[0] != 'block') {
+        throw new InvalidArgumentException("Invalid block section $blockstr");
+    }
+
+    array_shift($bits);
+    foreach ($bits as $b) {
+        $keyvalue = explode('=', $b);
+        $data[$keyvalue[0]] = substr($keyvalue[1], 1, -1);
+    }
+    
+    if (!isset($data['id']) || empty($data['id'])) {
+        throw new InvalidArgumentException("Invalid block $blockstr. Must have id");
+    }
+    // everything else can theoretically be optional....
+
+    return $data;
+        
+}
+
+function template_locate($templatename) {
+
+    // check dataroot first for custom templates
+    $fragment = 'templates/' . $templatename . '/fragment.template';
+    $css = 'templates/' . $templatename . '/fragment.css';
+
+    $template = array();
+
+    if ($path = realpath(get_config('dataroot') . $fragment)) {
+        $template[] = $path;
+        if (is_readable(get_config('dataroot') . $css)) {
+            $template[] = $path;
+        }
+        return $template;
+    }
+
+    if ($path = realpath(get_config('libroot') . $fragment)) {
+        $template[] = $path;
+        if (is_readable(get_config('libroot') . $css)) {
+            $template[] = $path;
+        }
+        return $template;
+    }
+
+    throw new InvalidArgumentException("Invalid template name $templatename, couldn't find");
+}
+
+
+?>