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<?php

//

// +----------------------------------------------------------------------+

// | Copyright (c) 1997-2005 Ulf Wendel, Pierre-Alain Joye                |

// +----------------------------------------------------------------------+

// | This source file is subject to the New BSD license, That is bundled  |

// | with this package in the file LICENSE, and is available through      |

// | the world-wide-web at                                                |

// | http://www.opensource.org/licenses/bsd-license.php                   |

// | If you did not receive a copy of the new BSDlicense and are unable   |

// | to obtain it through the world-wide-web, please send a note to       |

// | pajoye@php.net so we can mail you a copy immediately.                |

// +----------------------------------------------------------------------+

// | Author: Ulf Wendel <ulf.wendel@phpdoc.de>                            |

// |         Pierre-Alain Joye <pajoye@php.net>                           |

// +----------------------------------------------------------------------+

//

// $Id: IT.php,v 1.20 2006/08/17 15:47:22 dsp Exp $

//

require_once 'PEAR.php';

define('IT_OK',                         1);

define('IT_ERROR',                     -1);

define('IT_TPL_NOT_FOUND',             -2);

define('IT_BLOCK_NOT_FOUND',           -3);

define('IT_BLOCK_DUPLICATE',           -4);

define('IT_UNKNOWN_OPTION',            -6);

/**

 * Integrated Template - IT

 *

 * Well there's not much to say about it. I needed a template class that

 * supports a single template file with multiple (nested) blocks inside and

 * a simple block API.

 *

 * The Isotemplate API is somewhat tricky for a beginner although it is the best

 * one you can build. template::parse() [phplib template = Isotemplate] requests

 * you to name a source and a target where the current block gets parsed into.

 * Source and target can be block names or even handler names. This API gives you

 * a maximum of fexibility but you always have to know what you do which is

 * quite unusual for php skripter like me.

 *

 * I noticed that I do not any control on which block gets parsed into which one.

 * If all blocks are within one file, the script knows how they are nested and in

 * which way you have to parse them. IT knows that inner1 is a child of block2, there's

 * no need to tell him about this.

 *

 * <table border>

 *   <tr>

 *     <td colspan=2>

 *       __global__

 *       <p>

 *       (hidden and automatically added)

 *     </td>

 *   </tr>

 *   <tr>

 *     <td>block1</td>

 *     <td>

 *       <table border>

 *         <tr>

 *           <td colspan=2>block2</td>

 *         </tr>

 *         <tr>

 *           <td>inner1</td>

 *           <td>inner2</td>

 *         </tr>

 *       </table>

 *     </td>

 *   </tr>

 * </table>

 *

 * To add content to block1 you simply type:

 * <code>$tpl->setCurrentBlock("block1");</code>

 * and repeat this as often as needed:

 * <code>

 *   $tpl->setVariable(...);

 *   $tpl->parseCurrentBlock();

 * </code>

 *

 * To add content to block2 you would type something like:

 * <code>

 * $tpl->setCurrentBlock("inner1");

 * $tpl->setVariable(...);

 * $tpl->parseCurrentBlock();

 *

 * $tpl->setVariable(...);

 * $tpl->parseCurrentBlock();

 *

 * $tpl->parse("block1");

 * </code>

 *

 * This will result in one repition of block1 which contains two repitions

 * of inner1. inner2 will be removed if $removeEmptyBlock is set to true which is the default.

 *

 * Usage:

 * <code>

 * $tpl = new HTML_Template_IT( [string filerootdir] );

 *

 * // load a template or set it with setTemplate()

 * $tpl->loadTemplatefile( string filename [, boolean removeUnknownVariables, boolean removeEmptyBlocks] )

 *

 * // set "global" Variables meaning variables not beeing within a (inner) block

 * $tpl->setVariable( string variablename, mixed value );

 *

 * // like with the Isotemplates there's a second way to use setVariable()

 * $tpl->setVariable( array ( string varname => mixed value ) );

 *

 * // Let's use any block, even a deeply nested one

 * $tpl->setCurrentBlock( string blockname );

 *

 * // repeat this as often as you need it.

 * $tpl->setVariable( array ( string varname => mixed value ) );

 * $tpl->parseCurrentBlock();

 *

 * // get the parsed template or print it: $tpl->show()

 * $tpl->get();

 * </code>

 *

 * @author   Ulf Wendel <uw@netuse.de>

 * @version  $Id: IT.php,v 1.20 2006/08/17 15:47:22 dsp Exp $

 * @access   public

 * @package  HTML_Template_IT

 */

class HTML_Template_IT

{

    /**

     * Contains the error objects

     * @var      array

     * @access   public

     * @see      halt(), $printError, $haltOnError

     */

    var $err = array();

    /**

     * Clear cache on get()?

     * @var      boolean

     */

    var $clearCache = false;

    /**

     * First character of a variable placeholder ( _{_VARIABLE} ).

     * @var      string

     * @access   public

     * @see      $closingDelimiter, $blocknameRegExp, $variablenameRegExp

     */

    var $openingDelimiter = '{';

    /**

     * Last character of a variable placeholder ( {VARIABLE_}_ ).

     * @var      string

     * @access   public

     * @see      $openingDelimiter, $blocknameRegExp, $variablenameRegExp

     */

    var $closingDelimiter     = '}';

    /**

     * RegExp matching a block in the template.

     * Per default "sm" is used as the regexp modifier, "i" is missing.

     * That means a case sensitive search is done.

     * @var      string

     * @access   public

     * @see      $variablenameRegExp, $openingDelimiter, $closingDelimiter

     */

    var $blocknameRegExp    = '[\.0-9A-Za-z_-]+';

    /**

     * RegExp matching a variable placeholder in the template.

     * Per default "sm" is used as the regexp modifier, "i" is missing.

     * That means a case sensitive search is done.

     * @var      string

     * @access   public

     * @see      $blocknameRegExp, $openingDelimiter, $closingDelimiter

     */

    var $variablenameRegExp    = '[\.0-9A-Za-z_-]+';

    /**

     * RegExp used to find variable placeholder, filled by the constructor.

     * @var      string    Looks somewhat like @(delimiter varname delimiter)@

     * @access   public

     * @see      IntegratedTemplate()

     */

    var $variablesRegExp = '';

    /**

     * RegExp used to strip unused variable placeholder.

     * @brother  $variablesRegExp

     */

    var $removeVariablesRegExp = '';

    /**

     * Controls the handling of unknown variables, default is remove.

     * @var      boolean

     * @access   public

     */

    var $removeUnknownVariables = true;

    /**

     * Controls the handling of empty blocks, default is remove.

     * @var      boolean

     * @access   public

     */

    var $removeEmptyBlocks = true;

    /**

     * RegExp used to find blocks an their content, filled by the constructor.

     * @var      string

     * @see      IntegratedTemplate()

     */

    var $blockRegExp = '';

    /**

     * Name of the current block.

     * @var      string

     */

    var $currentBlock = '__global__';

    /**

     * Content of the template.

     * @var      string

     */

    var $template = '';

    /**

     * Array of all blocks and their content.

     *

     * @var      array

     * @see      findBlocks()

     */

    var $blocklist = array();

    /**

     * Array with the parsed content of a block.

     *

     * @var      array

     */

    var $blockdata = array();

    /**

     * Array of variables in a block.

     * @var      array

     */

    var $blockvariables = array();

    /**

     * Array of inner blocks of a block.

     * @var      array

     */

    var $blockinner = array();

    /**

     * List of blocks to preverse even if they are "empty".

     *

     * This is something special. Sometimes you have blocks that

     * should be preserved although they are empty (no placeholder replaced).

     * Think of a shopping basket. If it's empty you have to drop a message to

     * the user. If it's filled you have to show the contents of

     * the shopping baseket. Now where do you place the message that the basket

     * is empty? It's no good idea to place it in you applications as customers

     * tend to like unecessary minor text changes. Having another template file

     * for an empty basket means that it's very likely that one fine day

     * the filled and empty basket templates have different layout. I decided

     * to introduce blocks that to not contain any placeholder but only

     * text such as the message "Your shopping basked is empty".

     *

     * Now if there is no replacement done in such a block the block will

     * be recognized as "empty" and by default ($removeEmptyBlocks = true) be

     * stripped off. To avoid thisyou can now call touchBlock() to avoid this.

     *

     * The array $touchedBlocks stores a list of touched block which must not

     * be removed even if they are empty.

     *

     * @var  array    $touchedBlocks

     * @see  touchBlock(), $removeEmptyBlocks

     */

     var $touchedBlocks = array();

    /**

     * List of blocks which should not be shown even if not "empty"

     * @var  array    $_hiddenBlocks

     * @see  hideBlock(), $removeEmptyBlocks

     */

    var $_hiddenBlocks = array();

    /**

     * Variable cache.

     *

     * Variables get cached before any replacement is done.

     * Advantage: empty blocks can be removed automatically.

     * Disadvantage: might take some more memory

     *

     * @var    array

     * @see    setVariable(), $clearCacheOnParse

     */

    var $variableCache = array();

    /**

     * Clear the variable cache on parse?

     *

     * If you're not an expert just leave the default false.

     * True reduces memory consumption somewhat if you tend to

     * add lots of values for unknown placeholder.

     *

     * @var    boolean

     */

    var $clearCacheOnParse = false;

    /**

     * Root directory for all file operations.

     * The string gets prefixed to all filenames given.

     * @var    string

     * @see    HTML_Template_IT(), setRoot()

     */

    var $fileRoot = '';

    /**

     * Internal flag indicating that a blockname was used multiple times.

     * @var    boolean

     */

    var $flagBlocktrouble = false;

    /**

     * Flag indicating that the global block was parsed.

     * @var    boolean

     */

    var $flagGlobalParsed = false;

    /**

     * EXPERIMENTAL! FIXME!

     * Flag indication that a template gets cached.

     *

     * Complex templates require some times to be preparsed

     * before the replacement can take place. Often I use

     * one template file over and over again but I don't know

     * before that I will use the same template file again.

     * Now IT could notice this and skip the preparse.

     *

     * @var    boolean

     */

    var $flagCacheTemplatefile = true;

    /**

     * EXPERIMENTAL! FIXME!

     */

    var $lastTemplatefile = '';

    /**

     * $_options['preserve_data'] Whether to substitute variables and remove

     * empty placeholders in data passed through setVariable

     * (see also bugs #20199, #21951).

     * $_options['use_preg'] Whether to use preg_replace instead of

     * str_replace in parse()

     * (this is a backwards compatibility feature, see also bugs #21951, #20392)

     */

    var $_options = array(

        'preserve_data' => false,

        'use_preg'      => true

    );

    /**

     * Builds some complex regular expressions and optinally sets the

     * file root directory.

     *

     * Make sure that you call this constructor if you derive your template

     * class from this one.

     *

     * @param    string    File root directory, prefix for all filenames

     *                     given to the object.

     * @see      setRoot()

     */

    function HTML_Template_IT($root = '', $options = null)

    {

        if (!is_null($options)) {

            $this->setOptions($options);

        }

        $this->variablesRegExp = '@' . $this->openingDelimiter .

                                 '(' . $this->variablenameRegExp . ')' .

                                 $this->closingDelimiter . '@sm';

        $this->removeVariablesRegExp = '@' . $this->openingDelimiter .

                                       "\s*(" . $this->variablenameRegExp .

                                       ")\s*" . $this->closingDelimiter .'@sm';

        $this->blockRegExp = '@<!--\s+BEGIN\s+(' . $this->blocknameRegExp .

                             ')\s+-->(.*)<!--\s+END\s+\1\s+-->@sm';

        $this->setRoot($root);

    } // end constructor

    /**

     * Sets the option for the template class

     *

     * @access public

     * @param  string  option name

     * @param  mixed   option value

     * @return mixed   IT_OK on success, error object on failure

     */

    function setOption($option, $value)

    {

        if (array_key_exists($option, $this->_options)) {

            $this->_options[$option] = $value;

            return IT_OK;

        }

        return PEAR::raiseError(

                $this->errorMessage(IT_UNKNOWN_OPTION) . ": '{$option}'",

                IT_UNKNOWN_OPTION

            );

    }

    /**

     * Sets the options for the template class

     *

     * @access public

     * @param  string  options array of options

     *                 default value:

     *                   'preserve_data' => false,

     *                   'use_preg'      => true

     * @param  mixed   option value

     * @return mixed   IT_OK on success, error object on failure

     * @see $options

     */

    function setOptions($options)

    {

        if (is_array($options)) {

            foreach ($options as $option => $value) {

                $error = $this->setOption($option, $value);

                if (PEAR::isError($error)) {

                    return $error;

                }

            }

        }

        return IT_OK;

    }

    /**

     * Print a certain block with all replacements done.

     * @brother get()

     */

    function show($block = '__global__')

    {

        print $this->get($block);

    } // end func show

    /**

     * Returns a block with all replacements done.

     *

     * @param    string     name of the block

     * @return   string

     * @throws   PEAR_Error

     * @access   public

     * @see      show()

     */

    function get($block = '__global__')

    {

        if ($block == '__global__'  && !$this->flagGlobalParsed) {

            $this->parse('__global__');

        }

        if (!isset($this->blocklist[$block])) {

            $this->err[] = PEAR::raiseError(

                            $this->errorMessage(IT_BLOCK_NOT_FOUND) .

                            '"' . $block . "'",

                            IT_BLOCK_NOT_FOUND

                        );

            return '';

        }

        if (isset($this->blockdata[$block])) {

            $ret = $this->blockdata[$block];

            if ($this->clearCache) {

                unset($this->blockdata[$block]);

            }

            if ($this->_options['preserve_data']) {

                $ret = str_replace(

                        $this->openingDelimiter .

                        '%preserved%' . $this->closingDelimiter,

                        $this->openingDelimiter,

                        $ret

                    );

            }

            return $ret;

        }

        return '';

    } // end func get()

    /**

     * Parses the given block.

     *

     * @param    string    name of the block to be parsed

     * @access   public

     * @see      parseCurrentBlock()

     * @throws   PEAR_Error

     */

    function parse($block = '__global__', $flag_recursion = false)

    {

        static $regs, $values;

        if (!isset($this->blocklist[$block])) {

            return PEAR::raiseError(

                $this->errorMessage( IT_BLOCK_NOT_FOUND ) . '"' . $block . "'",

                        IT_BLOCK_NOT_FOUND

                );

        }

        if ($block == '__global__') {

            $this->flagGlobalParsed = true;

        }

        if (!$flag_recursion) {

            $regs   = array();

            $values = array();

        }

        $outer = $this->blocklist[$block];

        $empty = true;

        if ($this->clearCacheOnParse) {

            foreach ($this->variableCache as $name => $value) {

                $regs[] = $this->openingDelimiter .

                          $name . $this->closingDelimiter;

                $values[] = $value;

                $empty = false;

            }

            $this->variableCache = array();

        } else {

            foreach ($this->blockvariables[$block] as $allowedvar => $v) {

                if (isset($this->variableCache[$allowedvar])) {

                   $regs[]   = $this->openingDelimiter .

                               $allowedvar . $this->closingDelimiter;

                   $values[] = $this->variableCache[$allowedvar];

                   unset($this->variableCache[$allowedvar]);

                   $empty = false;

                }

            }

        }

        if (isset($this->blockinner[$block])) {

            foreach ($this->blockinner[$block] as $k => $innerblock) {

                $this->parse($innerblock, true);

                if ($this->blockdata[$innerblock] != '') {

                    $empty = false;

                }

                $placeholder = $this->openingDelimiter . "__" .

                                $innerblock . "__" . $this->closingDelimiter;

                $outer = str_replace(

                                    $placeholder,

                                    $this->blockdata[$innerblock], $outer

                        );

                $this->blockdata[$innerblock] = "";

            }

        }

        if (!$flag_recursion && 0 != count($values)) {

            if ($this->_options['use_preg']) {

                $regs        = array_map(array(

                                    &$this, '_addPregDelimiters'),

                                    $regs

                                );

                $funcReplace = 'preg_replace';

            } else {

                $funcReplace = 'str_replace';

            }

            if ($this->_options['preserve_data']) {

                $values = array_map(

                            array(&$this, '_preserveOpeningDelimiter'), $values

                        );

            }

            $outer = $funcReplace($regs, $values, $outer);

            if ($this->removeUnknownVariables) {

                $outer = preg_replace($this->removeVariablesRegExp, "", $outer);

            }

        }

        if ($empty) {

            if (!$this->removeEmptyBlocks) {

                $this->blockdata[$block ].= $outer;

            } else {

                if (isset($this->touchedBlocks[$block])) {

                    $this->blockdata[$block] .= $outer;

                    unset($this->touchedBlocks[$block]);

                }

            }

        } else {

            if (empty($this->blockdata[$block])) {

                $this->blockdata[$block] = $outer;

            } else {

                $this->blockdata[$block] .= $outer;

            }

        }

        return $empty;

    } // end func parse

    /**

     * Parses the current block

     * @see      parse(), setCurrentBlock(), $currentBlock

     * @access   public

     */

    function parseCurrentBlock()

    {

        return $this->parse($this->currentBlock);

    } // end func parseCurrentBlock

    /**

     * Sets a variable value.

     *

     * The function can be used eighter like setVariable( "varname", "value")

     * or with one array $variables["varname"] = "value"

     * given setVariable($variables) quite like phplib templates set_var().

     *

     * @param    mixed     string with the variable name or an array

     *                     %variables["varname"] = "value"

     * @param    string    value of the variable or empty if $variable

     *                     is an array.

     * @param    string    prefix for variable names

     * @access   public

     */

    function setVariable($variable, $value = '')

    {

        if (is_array($variable)) {

            $this->variableCache = array_merge(

                                            $this->variableCache, $variable

                                    );

        } else {

            $this->variableCache[$variable] = $value;

        }

    } // end func setVariable

    /**

     * Sets the name of the current block that is the block where variables

     * are added.

     *

     * @param    string      name of the block

     * @return   boolean     false on failure, otherwise true

     * @throws   PEAR_Error

     * @access   public

     */

    function setCurrentBlock($block = '__global__')

    {

        if (!isset($this->blocklist[$block])) {

            return PEAR::raiseError(

                $this->errorMessage( IT_BLOCK_NOT_FOUND ) .

                '"' . $block . "'", IT_BLOCK_NOT_FOUND

            );

        }

        $this->currentBlock = $block;

        return true;

    } // end func setCurrentBlock

    /**

     * Preserves an empty block even if removeEmptyBlocks is true.

     *

     * @param    string      name of the block

     * @return   boolean     false on false, otherwise true

     * @throws   PEAR_Error

     * @access   public

     * @see      $removeEmptyBlocks

     */

    function touchBlock($block)

    {

        if (!isset($this->blocklist[$block])) {

            return PEAR::raiseError(

                $this->errorMessage(IT_BLOCK_NOT_FOUND) .

                '"' . $block . "'", IT_BLOCK_NOT_FOUND);

        }

        $this->touchedBlocks[$block] = true;

        return true;

    } // end func touchBlock

    /**

     * Clears all datafields of the object and rebuild the internal blocklist

     *

     * LoadTemplatefile() and setTemplate() automatically call this function

     * when a new template is given. Don't use this function

     * unless you know what you're doing.

     *

     * @access   public

     * @see      free()

     */

    function init()

    {

        $this->free();

        $this->findBlocks($this->template);

        // we don't need it any more

        $this->template = '';

        $this->buildBlockvariablelist();

    } // end func init

    /**

     * Clears all datafields of the object.

     *

     * Don't use this function unless you know what you're doing.

     *

     * @access   public

     * @see      init()

     */

    function free()

    {

        $this->err = array();

        $this->currentBlock = '__global__';

        $this->variableCache    = array();

        $this->blocklist        = array();

        $this->touchedBlocks    = array();

        $this->flagBlocktrouble = false;

        $this->flagGlobalParsed = false;

    } // end func free

    /**

     * Sets the template.

     *

     * You can eighter load a template file from disk with

     * LoadTemplatefile() or set the template manually using this function.

     *

     * @param        string      template content

     * @param        boolean     remove unknown/unused variables?

     * @param        boolean     remove empty blocks?

     * @see          LoadTemplatefile(), $template

     * @access       public

     * @return       boolean

     */

    function setTemplate( $template, $removeUnknownVariables = true,

                          $removeEmptyBlocks = true)

    {

        $this->removeUnknownVariables = $removeUnknownVariables;

        $this->removeEmptyBlocks = $removeEmptyBlocks;

        if ($template == '' && $this->flagCacheTemplatefile) {

            $this->variableCache = array();

            $this->blockdata = array();

            $this->touchedBlocks = array();

            $this->currentBlock = '__global__';

        } else {

            $this->template = '<!-- BEGIN __global__ -->' . $template .

                              '<!-- END __global__ -->';

            $this->init();

        }

        if ($this->flagBlocktrouble) {

            return false;

        }

        return true;

    } // end func setTemplate

    /**

     * Reads a template file from the disk.

     *

     * @param    string      name of the template file

     * @param    bool        how to handle unknown variables.

     * @param    bool        how to handle empty blocks.

     * @access   public

     * @return   boolean    false on failure, otherwise true

     * @see      $template, setTemplate(), $removeUnknownVariables,

     *           $removeEmptyBlocks

     */

    function loadTemplatefile( $filename,

                               $removeUnknownVariables = true,

                               $removeEmptyBlocks = true )

    {

        $template = '';

        if (!$this->flagCacheTemplatefile ||

            $this->lastTemplatefile != $filename

        ) {

            $template = $this->getFile($filename);

        }

        $this->lastTemplatefile = $filename;

        return $template != '' ?

                $this->setTemplate(

                        $template,$removeUnknownVariables, $removeEmptyBlocks

                    ) : false;

    } // end func LoadTemplatefile

    /**

     * Sets the file root. The file root gets prefixed to all filenames passed

     * to the object.

     *

     * Make sure that you override this function when using the class

     * on windows.

     *

     * @param    string

     * @see      HTML_Template_IT()

     * @access   public

     */

    function setRoot($root)

    {

        if ($root != '' && substr($root, -1) != '/') {

            $root .= '/';

        }

        $this->fileRoot = $root;

    } // end func setRoot

    /**

     * Build a list of all variables within of a block

     */

    function buildBlockvariablelist()

    {

        foreach ($this->blocklist as $name => $content) {

            preg_match_all($this->variablesRegExp, $content, $regs);

            if (count($regs[1]) != 0) {

                foreach ($regs[1] as $k => $var) {

                    $this->blockvariables[$name][$var] = true;

                }

            } else {

                $this->blockvariables[$name] = array();

            }

        }

    } // end func buildBlockvariablelist

    /**

     * Returns a list of all global variables

     */

    function getGlobalvariables()

    {

        $regs   = array();

        $values = array();

        foreach ($this->blockvariables['__global__'] as $allowedvar => $v) {

            if (isset($this->variableCache[$allowedvar])) {

                $regs[]   = '@' . $this->openingDelimiter .

                            $allowedvar . $this->closingDelimiter . '@';

                $values[] = $this->variableCache[$allowedvar];

                unset($this->variableCache[$allowedvar]);

            }

        }

        return array($regs, $values);

    } // end func getGlobalvariables

    /**

     * Recusively builds a list of all blocks within the template.

     *

     * @param    string    string that gets scanned

     * @see      $blocklist

     */

    function findBlocks($string)

    {

        $blocklist = array();

        if (preg_match_all($this->blockRegExp, $string, $regs, PREG_SET_ORDER)) {

            foreach ($regs as $k => $match) {

                $blockname         = $match[1];

                $blockcontent = $match[2];

                if (isset($this->blocklist[$blockname])) {

                    $this->err[] = PEAR::raiseError(

                                            $this->errorMessage(

                                            IT_BLOCK_DUPLICATE, $blockname),

                                            IT_BLOCK_DUPLICATE

                                    );

                    $this->flagBlocktrouble = true;

                }

                $this->blocklist[$blockname] = $blockcontent;

                $this->blockdata[$blockname] = "";

                $blocklist[] = $blockname;

                $inner = $this->findBlocks($blockcontent);

                foreach ($inner as $k => $name) {

                    $pattern = sprintf(

                        '@<!--\s+BEGIN\s+%s\s+-->(.*)<!--\s+END\s+%s\s+-->@sm',

                        $name,

                        $name

                    );

                    $this->blocklist[$blockname] = preg_replace(

                                        $pattern,

                                        $this->openingDelimiter .

                                        '__' . $name . '__' .

                                        $this->closingDelimiter,

                                        $this->blocklist[$blockname]

                               );

                    $this->blockinner[$blockname][] = $name;

                    $this->blockparents[$name] = $blockname;

                }

            }

        }

        return $blocklist;

    } // end func findBlocks

    /**

     * Reads a file from disk and returns its content.

     * @param    string    Filename

     * @return   string    Filecontent

     */

    function getFile($filename)

    {

        if ($filename{0} == '/' && substr($this->fileRoot, -1) == '/') {

            $filename = substr($filename, 1);

        }

        $filename = $this->fileRoot . $filename;

        if (!($fh = @fopen($filename, 'r'))) {

            $this->err[] = PEAR::raiseError(

                        $this->errorMessage(IT_TPL_NOT_FOUND) .

                        ': "' .$filename .'"',

                        IT_TPL_NOT_FOUND

                    );

            return "";

        }

		$fsize = filesize($filename);

        if ($fsize < 1) {

			fclose($fh);

            return '';

        }

        $content = fread($fh, $fsize);

        fclose($fh);

        return preg_replace(

            "#<!-- INCLUDE (.*) -->#ime", "\$this->getFile('\\1')", $content

        );

    } // end func getFile

    /**

     * Adds delimiters to a string, so it can be used as a pattern

     * in preg_* functions

     *

     * @param string

     * @return string

     */

    function _addPregDelimiters($str)

    {

        return '@' . $str . '@';

    }

   /**

    * Replaces an opening delimiter by a special string

    *

    * @param  string

    * @return string

    */

    function _preserveOpeningDelimiter($str)

    {

        return (false === strpos($str, $this->openingDelimiter))?

                $str:

                str_replace(

                    $this->openingDelimiter,

                    $this->openingDelimiter .

                    '%preserved%' . $this->closingDelimiter,

                    $str

                );

    }

    /**

     * Return a textual error message for a IT error code

     *

     * @param integer $value error code

     *

     * @return string error message, or false if the error code was

     * not recognized

     */

    function errorMessage($value, $blockname = '')

    {

        static $errorMessages;

        if (!isset($errorMessages)) {

            $errorMessages = array(

                IT_OK                       => '',

                IT_ERROR                    => 'unknown error',

                IT_TPL_NOT_FOUND            => 'Cannot read the template file',

                IT_BLOCK_NOT_FOUND          => 'Cannot find this block',

                IT_BLOCK_DUPLICATE          => 'The name of a block must be'.

                                               ' uniquewithin a template.'.

                                               ' Found "' . $blockname . '" twice.'.

                                               'Unpredictable results '.

                                               'may appear.',

                IT_UNKNOWN_OPTION           => 'Unknown option'

            );

        }

        if (PEAR::isError($value)) {

            $value = $value->getCode();

        }

        return isset($errorMessages[$value]) ?