ITX.php

Go to the documentation of this file.

<?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 BSD license 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: ITX.php,v 1.16 2006/08/17 15:47:22 dsp Exp $
//


class HTML_Template_ITX extends HTML_Template_IT
{
    public $warn = array();

    public $printWarning = false;

    public $haltOnWarning = false;

    public $checkblocknameRegExp = '';

    public $functionPrefix = 'func_';

    public $functionnameRegExp = '[_a-zA-Z]+[A-Za-z_0-9]*';

    public $functionRegExp = '';

    public $functions = array();

    public $callback = array();

    public function __construct($root = '')
    {
        $this->checkblocknameRegExp = '@' . $this->blocknameRegExp . '@';
        $this->functionRegExp = '@' . $this->functionPrefix . '(' .
                                $this->functionnameRegExp . ')\s*\(@sm';

        parent::__construct($root);
    } // end func constructor

    public function init()
    {
        $this->free();
        $this->buildFunctionlist();
        $this->findBlocks($this->template);
        // we don't need it any more
        $this->template = '';
        $this->buildBlockvariablelist();
    } // end func init

    public function replaceBlock($block, $template, $keep_content = false)
    {
        if (!isset($this->blocklist[$block])) {
            throw (new ilTemplateException("The block " . "'$block'" .
                " does not exist in the template and thus it can't be replaced."));
        }

        if ($template == '') {
            throw (new ilTemplateException('No block content given.'));
        }

        if ($keep_content) {
            $blockdata = $this->blockdata[$block];
        }

        // remove all kinds of links to the block / data of the block
        $this->removeBlockData($block);

        $template = "<!-- BEGIN $block -->" . $template . "<!-- END $block -->";
        $parents = $this->blockparents[$block];
        $this->findBlocks($template);
        $this->blockparents[$block] = $parents;

        // KLUDGE: rebuild the list for all block - could be done faster
        $this->buildBlockvariablelist();

        if ($keep_content) {
            $this->blockdata[$block] = $blockdata;
        }

        // old TODO - I'm not sure if we need this
        // update caches

        return true;
    } // end func replaceBlock

    public function replaceBlockfile($block, $filename, $keep_content = false)
    {
        return $this->replaceBlock($block, $this->getFile($filename), $keep_content);
    } // end func replaceBlockfile

    public function addBlock($placeholder, $blockname, $template)
    {
        // Don't trust any user even if it's a programmer or yourself...
        if ($placeholder == '') {
            throw (new ilTemplateException('No variable placeholder given.'));
        } elseif ($blockname == '' ||
                    !preg_match($this->checkblocknameRegExp, $blockname)
        ) {
            throw (new ilTemplateException("No or invalid blockname '$blockname' given."));
        } elseif ($template == '') {
            throw (new ilTemplateException('No block content given.'));
        } elseif (isset($this->blocklist[$blockname])) {
            throw (new ilTemplateException('The block ' . $blockname . ' already exists.'));
        }

        // find out where to insert the new block
        $parents = $this->findPlaceholderBlocks($placeholder);
        if (count($parents) == 0) {
            throw (new ilTemplateException("The variable placeholder" .
                " '$placeholder' was not found in the template."));
            return;
        } elseif (count($parents) > 1) {
            reset($parents);
            foreach ($parents as $k => $parent) {
                $msg .= "$parent, ";
            }
            $msg = substr($parent, -2);
            throw (new ilTemplateException("The variable placeholder " . "'$placeholder'" .
                " must be unique, found in multiple blocks '$msg'."));
        }

        $template = "<!-- BEGIN $blockname -->" . $template . "<!-- END $blockname -->";
        $this->findBlocks($template);
        if ($this->flagBlocktrouble) {
            return false;    // findBlocks() already throws an exception
        }
        $this->blockinner[$parents[0]][] = $blockname;
        $this->blocklist[$parents[0]] = preg_replace(
            '@' . $this->openingDelimiter . $placeholder .
                    $this->closingDelimiter . '@',
            $this->openingDelimiter . '__' . $blockname . '__' .
                    $this->closingDelimiter,
            $this->blocklist[$parents[0]]
                );

        $this->deleteFromBlockvariablelist($parents[0], $placeholder);
        $this->updateBlockvariablelist($blockname);

        return true;
    } // end func addBlock

    public function addBlockfile($placeholder, $blockname, $filename)
    {
        return $this->addBlock($placeholder, $blockname, $this->getFile($filename));
    } // end func addBlockfile

    public function placeholderExists($placeholder, $block = '')
    {
        if ($placeholder == '') {
            throw (new ilTemplateException('No placeholder name given.'));
        }

        if ($block != '' && !isset($this->blocklist[$block])) {
            throw (new ilTemplateException("Unknown block '$block'."));
        }

        // name of the block where the given placeholder was found
        $found = '';

        if ($block != '') {
            if (is_array($variables = $this->blockvariables[$block])) {
                // search the value in the list of blockvariables
                reset($variables);
                foreach ($variables as $k => $variable) {
                    if ($k == $placeholder) {
                        $found = $block;
                        break;
                    }
                }
            }
        } else {

            // search all blocks and return the name of the first block that
            // contains the placeholder
            reset($this->blockvariables);
            foreach ($this->blockvariables as $blockname  => $variables) {
                if (is_array($variables) && isset($variables[$placeholder])) {
                    $found = $blockname;
                    break;
                }
            }
        }

        return $found;
    } // end func placeholderExists

    public function performCallback()
    {
        reset($this->functions);
        foreach ($this->functions as $func_id => $function) {
            if (isset($this->callback[$function['name']])) {
                if ($this->callback[$function['name']]['expandParameters']) {
                    $callFunction = 'call_user_func_array';
                } else {
                    $callFunction = 'call_user_func';
                }

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

    public function getFunctioncalls()
    {
        return $this->functions;
    } // end func getFunctioncalls

    public function setFunctioncontent($functionID, $replacement)
    {
        $this->variableCache['__function' . $functionID . '__'] = $replacement;
    } // end func setFunctioncontent

    public function setCallbackFunction($tplfunction, $callbackfunction, $callbackobject = '', $expandCallbackParameters=false)
    {
        if ($tplfunction == '' || $callbackfunction == '') {
            throw (new ilTemplateException("No template function " . "('$tplfunction')" .
                " and/or no callback function ('$callbackfunction') given."));
        }
        $this->callback[$tplfunction] = array(
                                          'function' => $callbackfunction,
                                          'object'   => $callbackobject,
                                          'expandParameters' => (boolean) $expandCallbackParameters
                                        );

        return true;
    } // end func setCallbackFunction

    public function setCallbackFuntiontable($functions)
    {
        $this->callback = $functions;
    } // end func setCallbackFunctiontable

    public 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

    public function getBlocklist()
    {
        $blocklist = array();
        foreach ($this->blocklist as $block => $content) {
            $blocklist[$block] = $block;
        }

        return $blocklist;
    } // end func getBlocklist

    public function blockExists($blockname)
    {
        return isset($this->blocklist[$blockname]);
    } // end func blockExists

    public 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

    public function BlockvariableExists($block, $variable)
    {
        return isset($this->blockvariables[$block][$variable]);
    } // end func BlockvariableExists

    public 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();

            $search = $regs[0] . $head . ')';

            $replace = $this->openingDelimiter .
                       '__function' . $num . '__' .
                       $this->closingDelimiter;

            $this->template = str_replace($search, $replace, $this->template);
            $template       = str_replace($search, $replace, $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

    public 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

    public function deleteFromBlockvariablelist($block, $variables)
    {
        if (!is_array($variables)) {
            $variables = array($variables => true);
        }

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

    public function updateBlockvariablelist($block)
    {
        preg_match_all(
            $this->variablesRegExp,
            $this->blocklist[$block],
            $regs
                    );

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

    public function findPlaceholderBlocks($variable)
    {
        $parents = array();
        reset($this->blocklist);
        foreach ($this->blocklist as $blockname => $content) {
            reset($this->blockvariables[$blockname]);
            foreach ($this->blockvariables[$blockname] as $varname => $val) {
                if ($variable == $varname) {
                    $parents[] = $blockname;
                }
            }
        }

        return $parents;
    } // end func findPlaceholderBlocks

    public 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 ($this->haltOnWarning) {
            die($message);
        }
    } // end func warning
} // end class HTML_Template_ITX