smarty/libs/sysplugins/smarty_internal_config.php

<?php
/**
* Smarty Internal Plugin Config
* 
* Main class for config variables
* 
* @ignore 
* @package Smarty
* @subpackage Config
* @author Uwe Tews 
*/
class Smarty_Internal_Config {
    static $config_objects = array();

    public function __construct($config_resource, $smarty, $template = null)
    {
        $this->template = $template;
        $this->smarty = $smarty;
        $this->config_resource = $config_resource;
        $this->config_resource_type = null;
        $this->config_resource_name = null;
        $this->config_filepath = null;
        $this->config_timestamp = null;
        $this->config_source = null;
        $this->compiled_config = null;
        $this->compiled_filepath = null;
        $this->compiled_timestamp = null;
        $this->mustCompile = null;
        $this->compiler_object = null; 
        // parse config resource name
        if (!$this->parseConfigResourceName ($config_resource)) {
            throw new Exception ("Unable to parse config resource '{$config_resource}'");
        } 
    } 

    public function getConfigFilepath ()
    {
        return $this->config_filepath === null ?
        $this->config_filepath = $this->buildConfigFilepath() :
        $this->config_filepath;
    } 

    public function getTimestamp ()
    {
        return $this->config_timestamp === null ?
        $this->config_timestamp = filemtime($this->getConfigFilepath()) :
        $this->config_timestamp;
    } 

    private function parseConfigResourceName($config_resource)
    {
        if (empty($config_resource))
            return false;
        if (strpos($config_resource, ':') === false) {
            // no resource given, use default
            $this->config_resource_type = $this->smarty->default_config_type;
            $this->config_resource_name = $config_resource;
        } else {
            // get type and name from path
            list($this->config_resource_type, $this->config_resource_name) = explode(':', $config_resource, 2);
            if (strlen($this->config_resource_type) == 1) {
                // 1 char is not resource type, but part of filepath
                $this->config_resource_type = $this->smarty->default_config_type;
                $this->config_resource_name = $config_resource;
            } else {
                $this->config_resource_type = strtolower($this->config_resource_type);
            } 
        } 
        return true;
    } 

    /*
     * get system filepath to config
     */
    public function buildConfigFilepath ()
    {
        foreach((array)$this->smarty->config_dir as $_config_dir) {
            if (strpos('/\\', substr($_config_dir, -1)) === false) {
                $_config_dir .= DS;
            } 

            $_filepath = $_config_dir . $this->config_resource_name;
            if (file_exists($_filepath))
                return $_filepath;
        } 
        // check for absolute path
        if (file_exists($this->config_resource_name))
            return $this->config_resource_name;
        // no tpl file found
        throw new Exception("Unable to load config file \"{$this->config_resource_name}\"");
        return false;
    } 
    /**
    * Read config file source
    * 
    * @return string content of source file
    */
    /**
    * Returns the template source code
    * 
    * The template source is being read by the actual resource handler
    * 
    * @return string the template source
    */
    public function getConfigSource ()
    {
        if ($this->config_source === null) {
            if ($this->readConfigSource($this) === false) {
                throw new Exception("Unable to load config file \"{$this->config_resource_name}\"");
            } 
        } 
        return $this->config_source;
    } 
    public function readConfigSource()
    { 
        // read source file
        if (file_exists($this->getConfigFilepath())) {
            $this->config_source = file_get_contents($this->getConfigFilepath());
            return true;
        } else {
            return false;
        } 
    } 

    /**
    * Returns the compiled  filepath
    * 
    * @return string the compiled filepath
    */
    public function getCompiledFilepath ()
    {
        return $this->compiled_filepath === null ?
        ($this->compiled_filepath = $this->buildCompiledFilepath()) :
        $this->compiled_filepath;
    } 
    public function buildCompiledFilepath()
    {
        $_flag = (int)$this->smarty->config_read_hidden + (int)$this->smarty->config_booleanize * 2 +
        (int)$this->smarty->config_overwrite * 4;
        $_filepath = sha1($this->config_resource_name . $_flag); 
        // if use_sub_dirs, break file into directories
        if ($this->smarty->use_sub_dirs) {
            $_filepath = substr($_filepath, 0, 2) . DS
             . substr($_filepath, 2, 2) . DS
             . substr($_filepath, 4, 2) . DS
             . $_filepath;
        } 
        $_compile_dir = $this->smarty->compile_dir;
        if (substr($_compile_dir, -1) != DS) {
            $_compile_dir .= DS;
        } 
        return $_compile_dir . $_filepath . '.' . basename($this->config_resource_name) . '.config' . '.php';
    } 
    /**
    * Returns the timpestamp of the compiled file
    * 
    * @return integer the file timestamp
    */
    public function getCompiledTimestamp ()
    {
        return $this->compiled_timestamp === null ?
        ($this->compiled_timestamp = (file_exists($this->getCompiledFilepath())) ? filemtime($this->getCompiledFilepath()) : false) :
        $this->compiled_timestamp;
    } 
    /**
    * Returns if the current config file must be compiled 
    * 
    * It does compare the timestamps of config source and the compiled config and checks the force compile configuration
    * 
    * @return boolean true if the file must be compiled
    */
    public function mustCompile ()
    {
        return $this->mustCompile === null ?
        $this->mustCompile = ($this->smarty->force_compile || $this->getCompiledTimestamp () !== $this->getTimestamp ()):
        $this->mustCompile;
    } 
    /**
    * Returns the compiled config file 
    * 
    * It checks if the config file must be compiled or just read the compiled version
    * 
    * @return string the compiled config file
    */
    public function getCompiledConfig ()
    {
        if ($this->compiled_config === null) {
            // see if template needs compiling.
            if ($this->mustCompile()) {
                $this->compileConfigSource();
            } else {
                $this->compiled_config = file_get_contents($this->getCompiledFilepath());
            } 
        } 
        return $this->compiled_config;
    } 

    /**
    * Compiles the config files
    */
    public function compileConfigSource ()
    { 
        // compile template
        if (!is_object($this->compiler_object)) {
            // load compiler
            $this->compiler_object = new Smarty_Internal_Config_File_Compiler($this->smarty);
        } 
        // call compiler
        if ($this->compiler_object->compileSource($this)) {
            // compiling succeded
            // write compiled template
            Smarty_Internal_Write_File::writeFile($this->getCompiledFilepath(), $this->getCompiledConfig(), $this->smarty); 
            // make template and compiled file timestamp match
            touch($this->getCompiledFilepath(), $this->getTimestamp());
        } else {
            // error compiling template
            throw new Exception("Error compiling template {$this->getConfigFilepath ()}");
            return false;
        } 
    } 

    /*
     * load config variables
    *
    * @param mixed $sections array of section names, single section or null
    * @param object $scope global,parent or local
    */
    public function loadConfigVars ($sections = null, $scope)
    {
        if (isset($this->template)) {
            $this->template->properties['file_dependency'][sha1($this->getConfigFilepath())] = array($this->getConfigFilepath(), $this->getTimestamp());
        } else {
            $this->smarty->properties['file_dependency'][sha1($this->getConfigFilepath())] = array($this->getConfigFilepath(), $this->getTimestamp());
        } 
        $config_data = unserialize($this->getCompiledConfig()); 
        // var_dump($config_data);
        // copy global config vars
        foreach ($config_data['vars'] as $variable => $value) {
            if ($this->smarty->config_overwrite || !isset($scope->config_vars[$variable])) {
                $scope->config_vars[$variable] = $value;
            } else {
                $scope->config_vars[$variable] = array_merge((array)$scope->config_vars[$variable], (array)$value);
            } 
        } 
        // scan sections
        foreach ($config_data['sections'] as $this_section => $dummy) {
            if ($sections == null || in_array($this_section, (array)$sections)) {
                foreach ($config_data['sections'][$this_section]['vars'] as $variable => $value) {
                    if ($this->smarty->config_overwrite || !isset($scope->config_vars[$variable])) {
                        $scope->config_vars[$variable] = $value;
                    } else {
                        $scope->config_vars[$variable] = array_merge((array)$scope->config_vars[$variable], (array)$value);
                    } 
                } 
            } 
        } 
    } 
} 

?>