PC Advisor 2006 January/PCA126_DVD.iso/ADVISORS/phpBB-2.0.17/phpBB2/includes/template.php

PHP Script | 2005-07-19 | 14.0 KB | 478 lines

<?php
/***************************************************************************
 *                              template.php
 *                            -------------------
 *   begin                : Saturday, Feb 13, 2001
 *   copyright            : (C) 2001 The phpBB Group
 *   email                : [e-mail]
 *
 *   $Id: template.php,v 1.10.2.5 2005/05/06 20:50:11 acydburn Exp $
 *
 *
 ***************************************************************************/

/***************************************************************************
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 ***************************************************************************/

/**
 * Template class. By Nathan Codding of the phpBB group.
 * The interface was originally inspired by PHPLib templates,
 * and the template file formats are quite similar.
 *
 */

class Template {
    var $classname = "Template";

    // variable that holds all the data we'll be substituting into
    // the compiled templates.
    // ...
    // This will end up being a multi-dimensional array like this:
    // $this->_tpldata[block.][iteration#][child.][iteration#][child2.][iteration#][variablename] == value
    // if it's a root-level variable, it'll be like this:
    // $this->_tpldata[.][0][varname] == value
    var $_tpldata = array();

    // Hash of filenames for each template handle.
    var $files = array();

    // Root template directory.
    var $root = "";

    // this will hash handle names to the compiled code for that handle.
    var $compiled_code = array();

    // This will hold the uncompiled code for that handle.
    var $uncompiled_code = array();

    /**
     * Constructor. Simply sets the root dir.
     *
     */
    function Template($root = ".")
    {
        $this->set_rootdir($root);
    }

    /**
     * Destroys this template object. Should be called when you're done with it, in order
     * to clear out the template data so you can load/parse a new template set.
     */
    function destroy()
    {
        $this->_tpldata = array();
    }

    /**
     * Sets the template root directory for this Template object.
     */
    function set_rootdir($dir)
    {
        if (!is_dir($dir))
        {
            return false;
        }

        $this->root = $dir;
        return true;
    }

    /**
     * Sets the template filenames for handles. $filename_array
     * should be a hash of handle => filename pairs.
     */
    function set_filenames($filename_array)
    {
        if (!is_array($filename_array))
        {
            return false;
        }

        reset($filename_array);
        while(list($handle, $filename) = each($filename_array))
        {
            $this->files[$handle] = $this->make_filename($filename);
        }

        return true;
    }


    /**
     * Load the file for the handle, compile the file,
     * and run the compiled code. This will print out
     * the results of executing the template.
     */
    function pparse($handle)
    {
        if (!$this->loadfile($handle))
        {
            die("Template->pparse(): Couldn't load template file for handle $handle");
        }

        // actually compile the template now.
        if (!isset($this->compiled_code[$handle]) || empty($this->compiled_code[$handle]))
        {
            // Actually compile the code now.
            $this->compiled_code[$handle] = $this->compile($this->uncompiled_code[$handle]);
        }

        // Run the compiled code.
        eval($this->compiled_code[$handle]);
        return true;
    }

    /**
     * Inserts the uncompiled code for $handle as the
     * value of $varname in the root-level. This can be used
     * to effectively include a template in the middle of another
     * template.
     * Note that all desired assignments to the variables in $handle should be done
     * BEFORE calling this function.
     */
    function assign_var_from_handle($varname, $handle)
    {
        if (!$this->loadfile($handle))
        {
            die("Template->assign_var_from_handle(): Couldn't load template file for handle $handle");
        }

        // Compile it, with the "no echo statements" option on.
        $_str = "";
        $code = $this->compile($this->uncompiled_code[$handle], true, '_str');

        // evaluate the variable assignment.
        eval($code);
        // assign the value of the generated variable to the given varname.
        $this->assign_var($varname, $_str);

        return true;
    }

    /**
     * Block-level variable assignment. Adds a new block iteration with the given
     * variable assignments. Note that this should only be called once per block
     * iteration.
     */
    function assign_block_vars($blockname, $vararray)
    {
        if (strstr($blockname, '.'))
        {
            // Nested block.
            $blocks = explode('.', $blockname);
            $blockcount = sizeof($blocks) - 1;
            $str = '$this->_tpldata';
            for ($i = 0; $i < $blockcount; $i++)
            {
                $str .= '[\'' . $blocks[$i] . '.\']';
                eval('$lastiteration = sizeof(' . $str . ') - 1;');
                $str .= '[' . $lastiteration . ']';
            }
            // Now we add the block that we're actually assigning to.
            // We're adding a new iteration to this block with the given
            // variable assignments.
            $str .= '[\'' . $blocks[$blockcount] . '.\'][] = $vararray;';

            // Now we evaluate this assignment we've built up.
            eval($str);
        }
        else
        {
            // Top-level block.
            // Add a new iteration to this block with the variable assignments
            // we were given.
            $this->_tpldata[$blockname . '.'][] = $vararray;
        }

        return true;
    }

    /**
     * Root-level variable assignment. Adds to current assignments, overriding
     * any existing variable assignment with the same name.
     */
    function assign_vars($vararray)
    {
        reset ($vararray);
        while (list($key, $val) = each($vararray))
        {
            $this->_tpldata['.'][0][$key] = $val;
        }

        return true;
    }

    /**
     * Root-level variable assignment. Adds to current assignments, overriding
     * any existing variable assignment with the same name.
     */
    function assign_var($varname, $varval)
    {
        $this->_tpldata['.'][0][$varname] = $varval;

        return true;
    }


    /**
     * Generates a full path+filename for the given filename, which can either
     * be an absolute name, or a name relative to the rootdir for this Template
     * object.
     */
    function make_filename($filename)
    {
        // Check if it's an absolute or relative path.
        if (substr($filename, 0, 1) != '/')
        {
               $filename = ($rp_filename = phpbb_realpath($this->root . '/' . $filename)) ? $rp_filename : $filename;
        }

        if (!file_exists($filename))
        {
            die("Template->make_filename(): Error - file $filename does not exist");
        }

        return $filename;
    }


    /**
     * If not already done, load the file for the given handle and populate
     * the uncompiled_code[] hash with its code. Do not compile.
     */
    function loadfile($handle)
    {
        // If the file for this handle is already loaded and compiled, do nothing.
        if (isset($this->uncompiled_code[$handle]) && !empty($this->uncompiled_code[$handle]))
        {
            return true;
        }

        // If we don't have a file assigned to this handle, die.
        if (!isset($this->files[$handle]))
        {
            die("Template->loadfile(): No file specified for handle $handle");
        }

        $filename = $this->files[$handle];

        $str = implode("", @file($filename));
        if (empty($str))
        {
            die("Template->loadfile(): File $filename for handle $handle is empty");
        }

        $this->uncompiled_code[$handle] = $str;

        return true;
    }



    /**
     * Compiles the given string of code, and returns
     * the result in a string.
     * If "do_not_echo" is true, the returned code will not be directly
     * executable, but can be used as part of a variable assignment
     * for use in assign_code_from_handle().
     */
    function compile($code, $do_not_echo = false, $retvar = '')
    {
        // replace \ with \\ and then ' with \'.
        $code = str_replace('\\', '\\\\', $code);
        $code = str_replace('\'', '\\\'', $code);

        // change template varrefs into PHP varrefs

        // This one will handle varrefs WITH namespaces
        $varrefs = array();
        preg_match_all('#\{(([a-z0-9\-_]+?\.)+?)([a-z0-9\-_]+?)\}#is', $code, $varrefs);
        $varcount = sizeof($varrefs[1]);
        for ($i = 0; $i < $varcount; $i++)
        {
            $namespace = $varrefs[1][$i];
            $varname = $varrefs[3][$i];
            $new = $this->generate_block_varref($namespace, $varname);

            $code = str_replace($varrefs[0][$i], $new, $code);
        }

        // This will handle the remaining root-level varrefs
        $code = preg_replace('#\{([a-z0-9\-_]*?)\}#is', '\' . ( ( isset($this->_tpldata[\'.\'][0][\'\1\']) ) ? $this->_tpldata[\'.\'][0][\'\1\'] : \'\' ) . \'', $code);

        // Break it up into lines.
        $code_lines = explode("\n", $code);

        $block_nesting_level = 0;
        $block_names = array();
        $block_names[0] = ".";

        // Second: prepend echo ', append ' . "\n"; to each line.
        $line_count = sizeof($code_lines);
        for ($i = 0; $i < $line_count; $i++)
        {
            $code_lines[$i] = chop($code_lines[$i]);
            if (preg_match('#<!-- BEGIN (.*?) -->#', $code_lines[$i], $m))
            {
                $n[0] = $m[0];
                $n[1] = $m[1];

                // Added: dougk_ff7-Keeps templates from bombing if begin is on the same line as end.. I think. :)
                if ( preg_match('#<!-- END (.*?) -->#', $code_lines[$i], $n) )
                {
                    $block_nesting_level++;
                    $block_names[$block_nesting_level] = $m[1];
                    if ($block_nesting_level < 2)
                    {
                        // Block is not nested.
                        $code_lines[$i] = '$_' . $n[1] . '_count = ( isset($this->_tpldata[\'' . $n[1] . '.\']) ) ?  sizeof($this->_tpldata[\'' . $n[1] . '.\']) : 0;';
                        $code_lines[$i] .= "\n" . 'for ($_' . $n[1] . '_i = 0; $_' . $n[1] . '_i < $_' . $n[1] . '_count; $_' . $n[1] . '_i++)';
                        $code_lines[$i] .= "\n" . '{';
                    }
                    else
                    {
                        // This block is nested.

                        // Generate a namespace string for this block.
                        $namespace = implode('.', $block_names);
                        // strip leading period from root level..
                        $namespace = substr($namespace, 2);
                        // Get a reference to the data array for this block that depends on the
                        // current indices of all parent blocks.
                        $varref = $this->generate_block_data_ref($namespace, false);
                        // Create the for loop code to iterate over this block.
                        $code_lines[$i] = '$_' . $n[1] . '_count = ( isset(' . $varref . ') ) ? sizeof(' . $varref . ') : 0;';
                        $code_lines[$i] .= "\n" . 'for ($_' . $n[1] . '_i = 0; $_' . $n[1] . '_i < $_' . $n[1] . '_count; $_' . $n[1] . '_i++)';
                        $code_lines[$i] .= "\n" . '{';
                    }

                    // We have the end of a block.
                    unset($block_names[$block_nesting_level]);
                    $block_nesting_level--;
                    $code_lines[$i] .= '} // END ' . $n[1];
                    $m[0] = $n[0];
                    $m[1] = $n[1];
                }
                else
                {
                    // We have the start of a block.
                    $block_nesting_level++;
                    $block_names[$block_nesting_level] = $m[1];
                    if ($block_nesting_level < 2)
                    {
                        // Block is not nested.
                        $code_lines[$i] = '$_' . $m[1] . '_count = ( isset($this->_tpldata[\'' . $m[1] . '.\']) ) ? sizeof($this->_tpldata[\'' . $m[1] . '.\']) : 0;';
                        $code_lines[$i] .= "\n" . 'for ($_' . $m[1] . '_i = 0; $_' . $m[1] . '_i < $_' . $m[1] . '_count; $_' . $m[1] . '_i++)';
                        $code_lines[$i] .= "\n" . '{';
                    }
                    else
                    {
                        // This block is nested.

                        // Generate a namespace string for this block.
                        $namespace = implode('.', $block_names);
                        // strip leading period from root level..
                        $namespace = substr($namespace, 2);
                        // Get a reference to the data array for this block that depends on the
                        // current indices of all parent blocks.
                        $varref = $this->generate_block_data_ref($namespace, false);
                        // Create the for loop code to iterate over this block.
                        $code_lines[$i] = '$_' . $m[1] . '_count = ( isset(' . $varref . ') ) ? sizeof(' . $varref . ') : 0;';
                        $code_lines[$i] .= "\n" . 'for ($_' . $m[1] . '_i = 0; $_' . $m[1] . '_i < $_' . $m[1] . '_count; $_' . $m[1] . '_i++)';
                        $code_lines[$i] .= "\n" . '{';
                    }
                }
            }
            else if (preg_match('#<!-- END (.*?) -->#', $code_lines[$i], $m))
            {
                // We have the end of a block.
                unset($block_names[$block_nesting_level]);
                $block_nesting_level--;
                $code_lines[$i] = '} // END ' . $m[1];
            }
            else
            {
                // We have an ordinary line of code.
                if (!$do_not_echo)
                {
                    $code_lines[$i] = 'echo \'' . $code_lines[$i] . '\' . "\\n";';
                }
                else
                {
                    $code_lines[$i] = '$' . $retvar . '.= \'' . $code_lines[$i] . '\' . "\\n";';
                }
            }
        }

        // Bring it back into a single string of lines of code.
        $code = implode("\n", $code_lines);
        return $code    ;

    }


    /**
     * Generates a reference to the given variable inside the given (possibly nested)
     * block namespace. This is a string of the form:
     * ' . $this->_tpldata['parent'][$_parent_i]['$child1'][$_child1_i]['$child2'][$_child2_i]...['varname'] . '
     * It's ready to be inserted into an "echo" line in one of the templates.
     * NOTE: expects a trailing "." on the namespace.
     */
    function generate_block_varref($namespace, $varname)
    {
        // Strip the trailing period.
        $namespace = substr($namespace, 0, strlen($namespace) - 1);

        // Get a reference to the data block for this namespace.
        $varref = $this->generate_block_data_ref($namespace, true);
        // Prepend the necessary code to stick this in an echo line.

        // Append the variable reference.
        $varref .= '[\'' . $varname . '\']';

        $varref = '\' . ( ( isset(' . $varref . ') ) ? ' . $varref . ' : \'\' ) . \'';

        return $varref;

    }


    /**
     * Generates a reference to the array of data values for the given
     * (possibly nested) block namespace. This is a string of the form:
     * $this->_tpldata['parent'][$_parent_i]['$child1'][$_child1_i]['$child2'][$_child2_i]...['$childN']
     *
     * If $include_last_iterator is true, then [$_childN_i] will be appended to the form shown above.
     * NOTE: does not expect a trailing "." on the blockname.
     */
    function generate_block_data_ref($blockname, $include_last_iterator)
    {
        // Get an array of the blocks involved.
        $blocks = explode(".", $blockname);
        $blockcount = sizeof($blocks) - 1;
        $varref = '$this->_tpldata';
        // Build up the string with everything but the last child.
        for ($i = 0; $i < $blockcount; $i++)
        {
            $varref .= '[\'' . $blocks[$i] . '.\'][$_' . $blocks[$i] . '_i]';
        }
        // Add the block reference for the last child.
        $varref .= '[\'' . $blocks[$blockcount] . '.\']';
        // Add the iterator for the last child if requried.
        if ($include_last_iterator)
        {
            $varref .= '[$_' . $blocks[$blockcount] . '_i]';
        }

        return $varref;
    }

}

?>