classes/config/ConfigParser.inc.php

<?php

// $Id: ConfigParser.inc.php,v 1.16 2008/07/01 01:16:09 asmecher Exp $


class ConfigParser {

   var $content;

   function ConfigParser() {
   }

   function &readConfig($file) {
      $configData = array();
      $currentSection = false;
      $falseValue = false;

      if (!file_exists($file) || !is_readable($file)) {
         return $falseValue;
      }

      $fp = fopen($file, 'rb');
      if (!$fp) {
         return $falseValue;
      }

      while (!feof($fp)) {
         $line = fgets($fp, 1024);
         $line = trim($line);
         if ($line === '' || strpos($line, ';') === 0) {
            // Skip empty or commented line
            continue;
         }

         if (preg_match('/^\[(.+)\]/', $line, $matches)) {
            // Found a section
            $currentSection = $matches[1];
            if (!isset($configData[$currentSection])) {
               $configData[$currentSection] = array();
            }

         } else if (strpos($line, '=') !== false) {
            // Found a setting
            list($key, $value) = explode('=', $line, 2);
            $key = trim($key);
            $value = trim($value);

            // FIXME This may produce incorrect results if the line contains a comment
            if (preg_match('/^[\"\'](.*)[\"\']$/', $value, $matches)) {
               // Treat value as a string
               $value = stripslashes($matches[1]);

            } else {
               preg_match('/^([\S]*)/', $value, $matches);
               $value = $matches[1];

               // Try to determine the type of the value
               if ($value === '') {
                  $value = null;

               } else if (is_numeric($value)) {
                  if (strstr($value, '.')) {
                     // floating-point
                     $value = (float) $value;
                  } else if (substr($value, 0, 2) == '0x') {
                     // hex
                     $value = intval($value, 16);
                  } else if (substr($value, 0, 1) == '0') {
                     // octal
                     $value = intval($value, 8);
                  } else {
                     // integer
                     $value = (int) $value;
                  }

               } else if (strtolower($value) == 'true' || strtolower($value) == 'on') {
                  $value = true;

               } else if (strtolower($value) == 'false' || strtolower($value) == 'off') {
                  $value = false;

               } else if (defined($value)) {
                  // The value matches a named constant
                  $value = constant($value);
               }
            }

            if ($currentSection === false) {
               $configData[$key] = $value;

            } else if (is_array($configData[$currentSection])) {
               $configData[$currentSection][$key] = $value;
            }
         }
      }

      fclose($fp);

      return $configData;
   }

   function updateConfig($file, $params) {
      if (!file_exists($file) || !is_readable($file)) {
         return false;
      }

      $this->content = '';
      $lines = file($file);

      // Parse each line of the configuration file
      for ($i=0, $count=count($lines); $i < $count; $i++) {
         $line = $lines[$i];

         if (preg_match('/^;/', $line) || preg_match('/^\s*$/', $line)) {
            // Comment or empty line
            $this->content .= $line;

         } else if (preg_match('/^\s*\[(\w+)\]/', $line, $matches)) {
            // Start of new section
            $currentSection = $matches[1];
            $this->content .= $line;

         } else if (preg_match('/^\s*(\w+)\s*=/', $line, $matches)) {
            // Variable definition
            $key = $matches[1];

            if (!isset($currentSection) && array_key_exists($key, $params) && !is_array($params[$key])) {
               // Variable not in a section
               $value = $params[$key];

            } else if (isset($params[$currentSection]) && is_array($params[$currentSection]) && array_key_exists($key, $params[$currentSection])) {
               // Variable in a section
               $value = $params[$currentSection][$key];

            } else {
               // Variable not to be changed, do not modify line
               $this->content .= $line;
               continue;
            }

            if (preg_match('/[^\w\-\/]/', $value)) {
               // Escape strings containing non-alphanumeric characters
               $valueString = '"' . $value . '"';
            } else {
               $valueString = $value;
            }

            $this->content .= "$key = $valueString\n";

         } else {
            $this->content .= $line;
         }
      }

      return true;
   }

   function writeConfig($file) {
      if (!(file_exists($file) && is_writable($file))
         && !(!file_exists($file) && is_dir(dirname($file)) && is_writable(dirname($file)))) {
         // File location cannot be written to
         return false;
      }

      $fp = @fopen($file, 'wb');
      if (!$fp) {
         return false;
      }

      fwrite($fp, $this->content);
      fclose($fp);
      return true;
   }

   function getFileContents() {
      return $this->content;
   }

}

?>

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