itx.php

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                if ('' != $this->callback[$function['name']]['object']) {
                    $this->variableCache['__function' . $func_id . '__'] =
                        call_user_func(
                        array(
                        &$GLOBALS[$this->callback[$function['name']]['object']],
                        $this->callback[$function['name']]['function']),
                        $function['args']
                       );
                } else {
                    $this->variableCache['__function' . $func_id . '__'] =
                            call_user_func(
                            $this->callback[$function['name']]['function'],
                            $function['args']
                        );
                }

            }

        }

    } // end func performCallback

    /**
    * Returns a list of all function calls in the current template.
    *
    * @return   array
    * @access   public
    */
    function getFunctioncalls()
    {
        return $this->functions;
    } // end func getFunctioncalls

    /**
    * Replaces a function call with the given replacement.
    *
    * @param    int       Function ID
    * @param    string    Replacement
    * @deprec
    */
    function setFunctioncontent($functionID, $replacement)
    {
        $this->variableCache['__function' . $functionID . '__'] = $replacement;
    } // end func setFunctioncontent

    /**
    * Sets a callback function.
    *
    * IT[X] templates (note the X) can contain simple function calls.
    * "function call" means that the editor of the template can add
    * special placeholder to the template like 'func_h1("embedded in h1")'.
    * IT[X] will grab this function calls and allow you to define a callback
    * function for them.
    *
    * This is an absolutely evil feature. If your application makes heavy
    * use of such callbacks and you're even implementing if-then etc. on
    * the level of a template engine you're reiventing the wheel... - that's
    * actually how PHP came into life. Anyway, sometimes it's handy.
    *
    * Consider also using XML/XSLT or native PHP. And please do not push
    * IT[X] any further into this direction of adding logics to the template
    * engine.
    *
    * For those of you ready for the X in IT[X]:
    *
    * <?php
    * ...
    * function h_one($args) {
    *    return sprintf('<h1>%s</h1>', $args[0]);
    * }
    *
    * ...
    * $itx = new HTML_Template_ITX( ... );
    * ...
    * $itx->setCallbackFunction('h1', 'h_one');
    * $itx->performCallback();
    * ?>
    *
    * template:
    * func_h1('H1 Headline');
    *
    * @param    string    Function name in the template
    * @param    string    Name of the callback function
    * @param    string    Name of the callback object
    * @return   boolean   False on failure.
    * @throws   IT_Error
    * @access   public
    */
    function
    setCallbackFunction($tplfunction, $callbackfunction, $callbackobject = '')
    {

        if ('' == $tplfunction || '' == $callbackfunction) {
            return new IT_Error(
                "No template function "."('$tplfunction')".
                " and/or no callback function ('$callback') given.",
                    __FILE__, __LINE__
                );
        }
        $this->callback[$tplfunction] = array(
                                          "function"    => $callbackfunction,
                                          "object"        => $callbackobject
                                        );

        return true;
    } // end func setCallbackFunction

    /**
    * Sets the Callback function lookup table
    *
    * @param    array    function table
    *                    array[templatefunction] =
    *                       array(
    *                               "function" => userfunction,
    *                               "object" => userobject
    *                       )
    * @access    public
    */
    function setCallbackFuntiontable($functions)
    {
        $this->callback = $functions;
    } // end func setCallbackFunctiontable

    /**
    * Recursively removes all data assiciated with a block, including all inner blocks
    *
    * @param    string  block to be removed
    */
    function removeBlockData($block)
    {
        if (isset($this->blockinner[$block])) {
            foreach ($this->blockinner[$block] as $k => $inner) {
                $this->removeBlockData($inner);
            }

            unset($this->blockinner[$block]);
        }

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

    } // end func removeBlockinner

    /**
    * Returns a list of blocknames in the template.
    *
    * @return    array    [blockname => blockname]
    * @access    public
    * @see        blockExists()
    */
    function getBlocklist()
    {
        $blocklist = array();
        foreach ($this->blocklist as $block => $content) {
            $blocklist[$block] = $block;
        }

        return $blocklist;
    } // end func getBlocklist

    /**
    * Checks wheter a block exists.
    *
    * @param    string
    * @return    boolean
    * @access    public
    * @see        getBlocklist()
    */
    function blockExists($blockname)
    {
        return isset($this->blocklist[$blockname]);
    } // end func blockExists

    /**
    * Returns a list of variables of a block.
    *
    * @param    string    Blockname
    * @return    array    [varname => varname]
    * @access    public
    * @see        BlockvariableExists()
    */
    function getBlockvariables($block)
    {
        if (!isset($this->blockvariables[$block])) {
            return array();
        }

        $variables = array();
        foreach ($this->blockvariables[$block] as $variable => $v) {
            $variables[$variable] = $variable;
        }

        return $variables;
    } // end func getBlockvariables

    /**
    * Checks wheter a block variable exists.
    *
    * @param    string    Blockname
    * @param    string    Variablename
    * @return    boolean
    * @access    public
    * @see    getBlockvariables()
    */
    function BlockvariableExists($block, $variable)
    {
        return isset($this->blockvariables[$block][$variable]);
    } // end func BlockvariableExists

    /**
    * Builds a functionlist from the template.
    */
    function buildFunctionlist()
    {
        $this->functions = array();

        $template = $this->template;
        $num = 0;

        while (preg_match($this->functionRegExp, $template, $regs)) {

            $pos = strpos($template, $regs[0]);
            $template = substr($template, $pos + strlen($regs[0]));

            $head = $this->getValue($template, ')');
            $args = array();

            $this->template = str_replace($regs[0] . $head . ')',
                                '{__function' . $num . '__}', $this->template
                            );
            $template = str_replace($regs[0] . $head . ')',
                        '{__function' . $num . '__}', $template
                        );

            while ('' != $head && $args2 = $this->getValue($head, ',')) {
                $arg2 = trim($args2);
                $args[] = ('"' == $arg2{0} || "'" == $arg2{0}) ?
                                    substr($arg2, 1, -1) : $arg2;
                if ($arg2 == $head) {
                    break;
                }
                $head = substr($head, strlen($arg2) + 1);
            }

            $this->functions[$num++] = array(
                                                'name'    => $regs[1],
                                                'args'    => $args
                                            );
        }

    } // end func buildFunctionlist


    function getValue($code, $delimiter) {
        if ('' == $code) {
            return '';
        }

        if (!is_array($delimiter)) {
            $delimiter = array( $delimiter => true );
        }

        $len         = strlen($code);
        $enclosed    = false;
        $enclosed_by = '';

        if (isset($delimiter[$code[0]])) {

            $i = 1;

        } else {

            for ($i = 0; $i < $len; ++$i) {

                $char = $code[$i];

                if (
                        ('"' == $char || "'" == $char) &&
                        ($char == $enclosed_by || '' == $enclosed_by) &&
                        (0 == $i || ($i > 0 && '\\' != $code[$i - 1]))
                    ){

                    if (!$enclosed) {
                        $enclosed_by = $char;
                    } else {
                        $enclosed_by = "";
                    }
                    $enclosed = !$enclosed;

                }
                if (!$enclosed && isset($delimiter[$char])) {
                    break;
                }
            }

        }

        return substr($code, 0, $i);
    } // end func getValue


    /**
    * Deletes one or many variables from the block variable list.
    *
    * @param    string    Blockname
    * @param    mixed     Name of one variable or array of variables
    *                     ( array ( name => true ) ) to be stripped.
    */
    function deleteFromBlockvariablelist($block, $variables)
    {
        if (!is_array($variables)) {
            $variables = array($variables => true);
        }

        reset($this->blockvariables[$block]);
        while (list($varname, $val) = each($this->blockvariables[$block])) {
            if (isset($variables[$varname])) {
                unset($this->blockvariables[$block][$varname]);
            }
        }
    } // end deleteFromBlockvariablelist

    /**
    * Updates the variable list of a block.
    *
    * @param    string    Blockname
    */
    function updateBlockvariablelist($block)
    {
        preg_match_all( $this->variablesRegExp,
                        $this->blocklist[$block], $regs
                    );

        if (0 != count($regs[1])) {
            foreach ($regs[1] as $k => $var) {
                $this->blockvariables[$block][$var] = true;
            }
        } else {
            $this->blockvariables[$block] = array();
        }

        // check if any inner blocks were found
        if (isset($this->blockinner[$block]) &&
            is_array($this->blockinner[$block]) &&
            count($this->blockinner[$block]) > 0
        ) {
            /*
             * loop through inner blocks, registering the variable
             * placeholders in each
             */
            foreach($this->blockinner[$block] as $childBlock) {
                $this->updateBlockvariablelist($childBlock);
            }
        }

    } // end func updateBlockvariablelist

    /**
    * Returns an array of blocknames where the given variable
    * placeholder is used.
    *
    * @param    string    Variable placeholder
    * @return    array    $parents    parents[0..n] = blockname
    */
    function findPlaceholderBlocks($variable)
    {
        $parents = array();
        reset($this->blocklist);
        while (list($blockname, $content) = each($this->blocklist)) {
            reset($this->blockvariables[$blockname]);
            while (
                list($varname, $val) = each($this->blockvariables[$blockname]))
            {
                if ($variable == $varname) {
                    $parents[] = $blockname;
                }
            }
        }

        return $parents;
    } // end func findPlaceholderBlocks

    /**
    * Handles warnings, saves them to $warn and prints them or
    * calls die() depending on the flags
    *
    * @param    string    Warning
    * @param    string    File where the warning occured
    * @param    int       Linenumber where the warning occured
    * @see      $warn, $printWarning, $haltOnWarning
    */
    function warning($message, $file = '', $line = 0)
    {
        $message = sprintf(
                    'HTML_Template_ITX Warning: %s [File: %s, Line: %d]',
                    $message,
                    $file,
                    $line
                );

        $this->warn[] = $message;

        if ($this->printWarning) {
            print $message;
        }

        if ($this->haltOnError) {
            die($message);
        }
    } // end func warning

} // end class HTML_Template_ITX
?>