<?php

/**
 * Smarty Internal Plugin Resource Extends
 *
 * Implements the file system as resource for Smarty which does extend a chain of template files templates
 *
 * @package Smarty
 * @subpackage TemplateResources
 * @author Uwe Tews
 */

/**
 * Smarty Internal Plugin Resource Extends
 */
class Smarty_Internal_Resource_Extends
{
    public function __construct($smarty)
    {
        $this->smarty = $smarty;
        $this->_rdl = preg_quote($smarty->right_delimiter);
        $this->_ldl = preg_quote($smarty->left_delimiter);
    }
    // classes used for compiling Smarty templates from file resource
    public $compiler_class = 'Smarty_Internal_SmartyTemplateCompiler';
    public $template_lexer_class = 'Smarty_Internal_Templatelexer';
    public $template_parser_class = 'Smarty_Internal_Templateparser';
    // properties
    public $usesCompiler = true;
    public $isEvaluated = false;
    public $allFilepaths = array();

    /**
     * Return flag if template source is existing
     *
     * @param  object  $_template template object
     * @return boolean result
     */
    public function isExisting($_template)
    {
          $_template->getTemplateFilepath();
          foreach ($this->allFilepaths as $_filepath) {
            if ($_filepath === false) {
            return false;
          }
        }

        return true;
    }
    /**
     * Get filepath to template source
     *
     * @param  object $_template template object
     * @return string filepath to template source file
     */
    public function getTemplateFilepath($_template)
    {
        $sha1String = '';
        $_files = explode('|', $_template->resource_name);
        foreach ($_files as $_file) {
            $_filepath = $_template->buildTemplateFilepath ($_file);
            if ($_filepath !== false) {
                if (is_object($_template->smarty->security_policy)) {
                    $_template->smarty->security_policy->isTrustedResourceDir($_filepath);
                }
            }
            $sha1String .= $_filepath;
            $this->allFilepaths[$_file] = $_filepath;
        }
        $_template->templateUid = sha1($sha1String);

        return $_filepath;
    }

    /**
     * Get timestamp to template source
     *
     * @param  object  $_template template object
     * @return integer timestamp of template source file
     */
    public function getTemplateTimestamp($_template)
    {
        return filemtime($_template->getTemplateFilepath());
    }

    /**
     * Read template source from file
     *
     * @param  object $_template template object
     * @return string content of template source file
     */
    public function getTemplateSource($_template)
    {
        $this->template = $_template;
        $_files = array_reverse($this->allFilepaths);
            $_first = reset($_files);
            $_last = end($_files);
        foreach ($_files as $_file => $_filepath) {
                if ($_filepath === false) {
                    throw new SmartyException("Unable to load template 'file : {$_file}'");
                }
            // read template file
            if ($_filepath != $_first) {
                $_template->properties['file_dependency'][sha1($_filepath)] = array($_filepath, filemtime($_filepath),'file');
            }
            $_template->template_filepath = $_filepath;
            $_content = file_get_contents($_filepath);
            if ($_filepath != $_last) {
                if (preg_match_all("!({$this->_ldl}block\s(.+?) {$this->_rdl})!", $_content, $_open) !=
                        preg_match_all("!({$this->_ldl}/block{$this->_rdl})!", $_content, $_close)) {
                    $this->smarty->triggerError("unmatched {block} {/block} pairs in file '$_filepath'");
                }
                preg_match_all("!{$this->_ldl}block\s(.+?){$this->_rdl}|{$this->_ldl}/block{$this->_rdl}!", $_content, $_result, PREG_OFFSET_CAPTURE);
                $_result_count = count($_result[0]);
                $_start = 0;
                while ($_start < $_result_count) {
                    $_end = 0;
                    $_level = 1;
                    while ($_level != 0) {
                        $_end++;
                        if (!strpos($_result[0][$_start + $_end][0], '/')) {
                            $_level++;
                        } else {
                            $_level--;
                        }
                    }
                    $_block_content = str_replace($this->smarty->left_delimiter . '$smarty.block.parent' . $this->smarty->right_delimiter, '%%%%SMARTY_PARENT%%%%',
                        substr($_content, $_result[0][$_start][1] + strlen($_result[0][$_start][0]), $_result[0][$_start + $_end][1] - $_result[0][$_start][1] - + strlen($_result[0][$_start][0])));
                    Smarty_Internal_Compile_Block::saveBlockData($_block_content, $_result[0][$_start][0], $_template, $_filepath);
                    $_start = $_start + $_end + 1;
                }
            } else {
                $_template->template_source = $_content;

                return true;
            }
        }
    }

    /**
     * Get filepath to compiled template
     *
     * @param  object $_template template object
     * @return string return path to compiled template
     */
    public function getCompiledFilepath($_template)
    {
        $_compile_id = isset($_template->compile_id) ? preg_replace('![^\w\|]+!', '_', $_template->compile_id) : null;
        $_files = explode('|', $_template->resource_name);
        // calculate Uid if not already done
        if ($_template->templateUid == '') {
            $_template->getTemplateFilepath();
        }
        $_filepath = $_template->templateUid;
        // if use_sub_dirs, break file into directories
        if ($_template->smarty->use_sub_dirs) {
            $_filepath = substr($_filepath, 0, 2) . DS
             . substr($_filepath, 2, 2) . DS
             . substr($_filepath, 4, 2) . DS
             . $_filepath;
        }
        $_compile_dir_sep = $_template->smarty->use_sub_dirs ? DS : '^';
        if (isset($_compile_id)) {
            $_filepath = $_compile_id . $_compile_dir_sep . $_filepath;
        }
        if ($_template->caching) {
            $_cache = '.cache';
        } else {
            $_cache = '';
        }
        $_compile_dir = $_template->smarty->compile_dir;
        if (substr($_compile_dir, -1) != DS) {
            $_compile_dir .= DS;
        }

        return $_compile_dir . $_filepath . '.' . $_template->resource_type . '.' . basename($_files[count($_files)-1]) . $_cache . '.php';
    }
}