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Filename : PHPLIB.php
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<?php
/**
 * This code that was derived from the original PHPLIB Template class
 * is copyright by Kristian Koehntopp, NetUSE AG and was released
 * under the LGPL.
 *
 * PHP Versions 4 and 5
 *
 * @category HTML
 * @package  HTML_Template_PHPLIB
 * @author   Kristian Koehntopp <kris@koehntopp.de>
 * @author   Bjoern Schotte <schotte@mayflower.de>
 * @author   Martin Jansen <mj@php.net>
 * @license  http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
 * @version  CVS: $Id$
 * @link     http://pear.php.net/package/HTML_Template_PHPLIB
 */

/**
 * Converted PHPLIB Template class
 *
 * For those who want to use PHPLIB's fine template class,
 * here's a PEAR conforming class with the original PHPLIB
 * template code from phplib-stable CVS. Original author
 * was Kristian Koehntopp <kris@koehntopp.de>
 *
 * @category HTML
 * @package  HTML_Template_PHPLIB
 * @author   Bjoern Schotte <schotte@mayflower.de>
 * @author   Martin Jansen <mj@php.net>
 * @license  http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
 * @link     http://pear.php.net/package/HTML_Template_PHPLIB
 */
class HTML_Template_PHPLIB
{
    /**
     * If set, echo assignments
     * @var bool
     */
    var $debug     = false;

    /**
     * $file[handle] = 'filename';
     * @var array
     */
    var $file  = array();

    /**
     * fallback paths that should be defined in a child class
     * @var array
     */
    var $file_fallbacks = array();

    /**
     * Relative filenames are relative to this pathname
     * @var string
     */
    var $root   = '';

    /*
     * $_varKeys[key] = 'key'
     * @var array
     */
    var $_varKeys = array();

    /**
     * $_varVals[key] = 'value';
     * @var array
     */
    var $_varVals = array();

    /**
     * 'remove'  => remove undefined variables
     * 'comment' => replace undefined variables with comments
     * 'keep'    => keep undefined variables
     *
     * @var string
     */
    var $unknowns = 'remove';

    /**
     * Characters that are not allowed in variable names.
     * Need to be preg_quote'd.
     *
     * @var string
     *
     * @see setIllegals()
     */
    var $illegals = '';

    /**
     * 'yes'    => halt,
     * 'report' => report error, continue, return false
     * 'return' => return PEAR_Error object,
     * 'no'     => ignore error quietly, return false from functions
     * @var string
     */
    var $haltOnError  = 'report';

    /**
     * The last error message is retained here
     * @var string
     * @see halt
     */
    var $_lastError     = '';


    /**
     * Constructor
     *
     * @param string $root     Template root directory
     * @param string $unknowns How to handle unknown variables
     * @param array  $fallback Fallback paths
     *
     * @access public
     */
    function HTML_Template_PHPLIB(
        $root = '.', $unknowns = 'remove', $fallback=''
    ) {
        $this->setRoot($root);
        $this->setUnknowns($unknowns);
        if (is_array($fallback)) {
            $this->file_fallbacks = $fallback;
        }
    }

    /**
     * Clears a variable (sets its content to "")
     *
     * @param array|string $var Variable name to clear, or array name
     *
     * @return void
     *
     * @access public
     */
    function clearVar($var)
    {
        if (is_array($var)) {
            foreach ($var as $varname) {
                $this->setVar($varname, '');
            }
        } else {
            $this->setVar($var, '');
        }
    }

    /**
     * Unsets a variable completly
     *
     * @param array|string $var Variable name to clear, or array of names
     *
     * @return void
     *
     * @access public
     */
    function unsetVar($var)
    {
        if (is_array($var)) {
            foreach ($var as $varname) {
                unset($this->_varKeys[$varname]);
                unset($this->_varVals[$varname]);
            }
        } else {
            unset($this->_varKeys[$var]);
            unset($this->_varVals[$var]);
        }
    }

    /**
     * Checks if the given variable exists.
     * When an array is given, it is checked if all
     * variables exist.
     *
     * @param string|array $var Variable to check
     *
     * @return boolean True if the variable exists
     */
    function exists($var)
    {
        if (is_array($var)) {
            $isset = true;
            foreach ($var as $varname) {
                $isset = $isset & isset($this->_varVals[$varname]);
            }
            return $isset > 0;
        } else {
            return isset($this->_varVals[$var]);
        }
    }

    /**
     * Sets the template directory
     *
     * @param string $root New template directory
     *
     * @return bool
     * @access public
     */
    function setRoot($root)
    {
        if (!is_dir($root)) {
            return $this->halt('setRoot: ' . $root . ' is not a directory.');
        }

        $this->root = $root;

        return true;
    }

    /**
     * What to do with unknown variables
     *
     * three possible values:
     *
     * - 'remove' will remove unknown variables
     *   (don't use this if you define CSS in your page)
     * - 'comment' will replace undefined variables with comments
     * - 'keep' will keep undefined variables as-is
     *
     * @param string $unknowns Unknowns
     *
     * @return void
     * @access public
     */
    function setUnknowns($unknowns = 'keep')
    {
        $this->unknowns = $unknowns;
    }

    /**
     * Set characters that are not allowed in variable names.
     * Normal illegal characters like space, tab, newline
     * are automatically there and do not have to be mentioned here.
     *
     * @param string $illegals String of characters not allowed in
     *                         template variable names.
     *
     * @return void
     * @access public
     *
     * @see $illegals
     */
    function setIllegals($illegals)
    {
        $this->illegals = preg_quote($illegals, '/');
    }

    /**
     * Set appropriate template files
     *
     * With this method you set the template files you want to use.
     * Either you supply an associative array with key/value pairs
     * where the key is the handle for the filname and the value
     * is the filename itself, or you define $handle as the file name
     * handle and $filename as the filename if you want to define only
     * one template.
     *
     * @param mixed  $handle   Handle for a filename or array with
     *                          handle/name value pairs
     * @param string $filename Name of template file
     *
     * @return bool True if file could be loaded
     *
     * @access public
     */
    function setFile($handle, $filename = '')
    {
        if (!is_array($handle)) {

            if ($filename == '') {
                return $this->halt(
                    'setFile: For handle '
                    . $handle . ' filename is empty.'
                );
            }

            $file = $this->_filename($filename);
            if ($this->isError($file)) {
                $this->file[$handle] = false;
                return $file;
            }
            $this->file[$handle] = $file;
            return true;
        } else {
            reset($handle);
            $allok = true;
            while (list($h, $f) = each($handle)) {
                $file = $this->_filename($f);
                if ($this->isError($file)) {
                    $this->file[$h] = false;
                    $allok = $file;
                } else {
                    $this->file[$h] = $file;
                }
            }

            return $allok;
        }
    }

    /**
     * Set a block in the appropriate template handle
     *
     * By setting a block like that:
     *
     * &lt;!-- BEGIN blockname --&gt;
     * html code
     * &lt;!-- END blockname --&gt;
     *
     * you can easily do repeating HTML code, i.e. output
     * database data nice formatted into a HTML table where
     * each DB row is placed into a HTML table row which is
     * defined in this block.
     * It extracts the template $handle from $parent and places
     * variable {$name} instead.
     *
     * @param string $parent Parent handle
     * @param string $handle Block name handle
     * @param string $name   Variable substitution name
     *
     * @return mixed True if all went well
     * @access public
     */
    function setBlock($parent, $handle, $name = '')
    {
        if ($this->isError($this->_loadFile($parent))) {
            return $this->halt(
                'setBlock: unable to load ' . $parent . '.'
            );
        }

        if ($name == '') {
            $name = $handle;
        }

        $str = $this->getVar($parent);
        $reg = "/[ \t]*<!--\\s+BEGIN $handle\\s+-->\\s*?\n?(\\s*.*?\n?)"
             . "\\s*<!--\\s+END $handle\\s+-->\\s*?\n?/sm";
        $m   = array();
        preg_match_all($reg, $str, $m);
        $str = preg_replace($reg, '{' . $name . '}', $str);

        if (isset($m[1][0])) {
            $this->setVar($handle, $m[1][0]);
        }
        $this->setVar($parent, $str);

        return true;
    }

    /**
     * Set corresponding substitutions for placeholders
     *
     * @param string  $varname Name of a variable that is to be defined
     *                          or an array of variables with value
     *                          substitution as key/value pairs
     * @param string  $value   Value of that variable
     * @param boolean $append  If true, the value is appended to the
     *                          variable's existing value
     *
     * @return void
     * @access public
     */
    function setVar($varname, $value = '', $append = false)
    {
        if (!is_array($varname)) {

            if (!empty($varname)) {
                if ($this->debug) {
                    print 'scalar: set *' . $varname . '* to *'
                         . $value . '*<br>\n';
                }
            }

            $this->_varKeys[$varname] = $this->_varname($varname);
            ($append) ? $this->_varVals[$varname] .= $value
                      : $this->_varVals[$varname] = $value;

        } else {
            reset($varname);

            while (list($k, $v) = each($varname)) {
                if (!empty($k)) {
                    if ($this->debug) {
                        print 'array: set *' . $k . '* to *' . $v . '*<br>\n';
                    }
                }

                $this->_varKeys[$k] = $this->_varname($k);
                ($append) ? $this->_varVals[$k] .= $v
                          : $this->_varVals[$k] = $v;
            }
        }
    }

    /**
     * Substitute variables in handle $handle
     *
     * @param string $handle Name of handle
     *
     * @return mixed String substituted content of handle
     * @access public
     */
    function subst($handle)
    {
        if ($this->isError($this->_loadFile($handle))) {
            return $this->halt('subst: unable to load ' . $handle . '.');
        }

        return @str_replace(
            $this->_varKeys, $this->_varVals, $this->getVar($handle)
        );
    }

    /**
     * Same as subst but printing the result
     *
     * @param string $handle Handle of template
     *
     * @return bool always false
     * @access public
     * @see subst
     */
    function pSubst($handle)
    {
        print $this->subst($handle);
        return false;
    }

    /**
     * Parse handle into target
     *
     * Parses handle $handle into $target, eventually
     * appending handle at $target if $append is defined
     * as TRUE.
     *
     * @param string  $target Target handle to parse into
     * @param string  $handle Which handle should be parsed
     * @param boolean $append Append it to $target or not?
     *
     * @return string parsed handle
     * @access public
     */
    function parse($target, $handle, $append = false)
    {
        if (!is_array($handle)) {
            $str = $this->subst($handle);

            ($append) ? $this->setVar($target, $this->getVar($target) . $str)
                      : $this->setVar($target, $str);
        } else {
            reset($handle);

            while (list(, $h) = each($handle)) {
                $str = $this->subst($h);
                $this->setVar($target, $str);
            }
        }

        return $str;
    }

    /**
     * Same as parse, but printing it.
     *
     * @param string $target Target to parse into
     * @param string $handle Handle which should be parsed
     * @param should $append If $handle shall be appended to $target?
     *
     * @return bool
     * @access public
     * @see parse
     */
    function pParse($target, $handle, $append = false)
    {
        print $this->finish($this->parse($target, $handle, $append));
        return false;
    }

    /**
     * Return all defined variables and their values
     *
     * @return array with all defined variables and their values
     * @access public
     */
    function getVars()
    {
        reset($this->_varKeys);

        while (list($k, ) = each($this->_varKeys)) {
            $result[$k] = $this->getVar($k);
        }

        return $result;
    }

    /**
     * Return one or more specific variable(s) with their values.
     *
     * @param mixed $varname Array with variable names
     *                       or one variable name as a string
     *
     * @return mixed Array of variable names with their values
     *               or value of one specific variable
     * @access public
     */
    function getVar($varname)
    {
        if (!is_array($varname)) {
            if (isset($this->_varVals[$varname])) {
                return $this->_varVals[$varname];
            } else {
                return '';
            }
        } else {
            reset($varname);

            while (list($k, ) = each($varname)) {
                $result[$k] = (isset($this->_varVals[$k]))
                    ? $this->_varVals[$k] : '';
            }

            return $result;
        }
    }

    /**
     * Get undefined values of a handle
     *
     * @param string $handle Handle name
     *
     * @return mixed False if an error occured or the array of undefined values
     * @access public
     */
    function getUndefined($handle)
    {
        if (!$this->_loadFile($handle)) {
            return $this->halt('getUndefined: unable to load ' . $handle);
        }

        preg_match_all(
            '/{([^ \t\r\n}' . $this->illegals . ']+)}/',
            $this->getVar($handle), $m
        );
        $m = $m[1];
        if (!is_array($m)) {
            return false;
        }

        reset($m);
        while (list(, $v) = each($m)) {
            if (!isset($this->_varKeys[$v])) {
                $result[$v] = $v;
            }
        }

        if (isset($result) && count($result)) {
            return $result;
        } else {
            return false;
        }
    }

    /**
     * Finish string
     *
     * @param string $str String to finish
     *
     * @return finished, i.e. substituted string
     * @access public
     */
    function finish($str)
    {
        switch ($this->unknowns) {
        case 'remove':
            $str = preg_replace(
                '/{[^ \t\r\n}' . $this->illegals . ']+}/',
                '', $str
            );
            break;

        case 'comment':
            $str = preg_replace(
                '/{([^ \t\r\n}' . $this->illegals . ']+)}/',
                '<!-- Template variable \\1 undefined -->', $str
            );
            break;
        }

        return $str;
    }

    /**
     * Print variable to the browser
     *
     * @param string $varname Name of variable to print
     *
     * @return void
     * @access public
     */
    function p($varname)
    {
        print $this->finish($this->getVar($varname));
    }

    /**
     * Get finished variable
     *
     * @param string $varname Name of variable to get
     *
     * @return string string with finished variable
     * @access public public
     */
    function get($varname)
    {
        return $this->finish($this->getVar($varname));
    }

    /**
     * Complete filename
     *
     * Complete filename, i.e. testing it for slashes
     *
     * @param string $filename Filename to be completed
     *
     * @access private
     * @return string completed filename
     */
    function _filename($filename)
    {
        if (!$this->_isAbsolute($filename)) {
            $filename = $this->root . '/' . $filename;
        }

        if (file_exists($filename)) {
            return $filename;
        }

        if (is_array($this->file_fallbacks)
            && count($this->file_fallbacks) > 0
        ) {
            reset($this->file_fallbacks);
            while (list(,$v) = each($this->file_fallbacks)) {
                if (file_exists($v.basename($filename))) {
                    return $v.basename($filename);
                }
            }
            return $this->halt(
                sprintf(
                    'filename: file %s does not exist in the fallback paths %s.',
                    $filename,
                    implode(',', $this->file_fallbacks)
                )
            );
        } else {
            return $this->halt(
                sprintf('filename: file %s does not exist.', $filename)
            );
        }
    }


    /**
     * Tells you whether a filename is absolute or relative
     *
     * @param string $filename Filename to check
     *
     * @return boolean true if the filename is absolute
     */
    function _isAbsolute($filename)
    {
        if (substr($filename, 0, 1) == '/') {
            //unix
            return true;
        } else if (substr($filename, 1, 2) == ':\\') {
            //windows
            return true;
        }
        return false;
    }

    /**
     * Protect a replacement variable
     *
     * @param string $varname name of replacement variable
     *
     * @return string replaced variable
     * @access private
     */
    function _varname($varname)
    {
        return '{' . $varname . '}';
    }

    /**
     * load file defined by handle if it is not loaded yet
     *
     * @param string $handle File handle
     *
     * @return bool False if error, true if all is ok
     * @access private
     */
    function _loadFile($handle)
    {
        if (isset($this->_varKeys[$handle]) and !empty($this->_varVals[$handle])) {
            return true;
        }

        if (!isset($this->file[$handle])) {
            return $this->halt('loadfile: ' . $handle . ' is not a valid handle.');
        }

        $filename = $this->file[$handle];
        if (function_exists('file_get_contents')) {
            $str = file_get_contents($filename);
        } else {
            if (!$fp = @fopen($filename, 'r')) {
                return $this->halt('loadfile: couldn\'t open ' . $filename);
            }

            $str = fread($fp, filesize($filename));
            fclose($fp);
        }

        if ($str == '') {
            return $this->halt(
                'loadfile: While loading ' . $handle . ', '
                . $filename . ' does not exist or is empty.'
            );
        }

        $this->setVar($handle, $str);

        return true;
    }

    /**
     * Error function. Halt template system with message to show
     *
     * @param string $msg message to show
     *
     * @return bool
     * @access public
     */
    function halt($msg)
    {
        $this->_lastError = $msg;

        switch ($this->haltOnError) {
        case 'yes':
            return $this->haltMsg(
                $msg, PEAR_ERROR_TRIGGER, E_USER_ERROR
            );

        case 'report':
            $this->haltMsg(
                $msg, PEAR_ERROR_PRINT
            );
            return false;

        case 'return':
            return $this->haltMsg(
                $msg, PEAR_ERROR_RETURN
            );

        case 'no':
        default:
            return false;
        }
    }

    /**
     * printf error message to show
     *
     * @param string $msg   Message to show
     * @param string $mode  PEAR error mode, i.e. PEAR_ERROR_RETURN
     * @param string $level Internal error level when $mode
     *                      is PEAR_ERROR_TRIGGER
     *
     * @return object PEAR error object
     * @access public
     */
    function haltMsg($msg, $mode = null, $level = null)
    {
        include_once 'PEAR.php';
        return PEAR::raiseError(
            '<b>Template Error:</b> ' . $msg . '<br/>' . "\n",
            null,
            $mode, $level
        );
    }

    /**
     * Returns the last error message if any
     *
     * @return boolean|string Last error message if any, false if none.
     */
    function getLastError()
    {
        if ($this->_lastError == '') {
            return false;
        }
        return $this->_lastError;
    }



    /**
     * Checks if the given value is an error
     *
     * @param mixed $val Some value
     *
     * @return boolean True if it is an error
     */
    function isError($val)
    {
        if ($val === false) {
            return true;
        } else if ($this->haltOnError == 'return' && is_object($val)) {
            include_once 'PEAR.php';
            return PEAR::isError($val);
        }
        return false;
    }//function isError($val)

}

/**
 * Backwards-compatibility for HTML_Template_PHPLIB.
 * Used to have this name here.
 *
 * @category HTML
 * @package  HTML_Template_PHPLIB
 * @author   Christian Weiske <cweiske@php.net>
 * @license  http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
 * @link     http://pear.php.net/package/HTML_Template_PHPLIB
 */
class Template_PHPLIB extends HTML_Template_PHPLIB
{
}

?>