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Файл: app/lib/smarty/sysplugins/smarty_internal_templatecompilerbase.php
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<?php

/**
 * Smarty Internal Plugin Smarty Template Compiler Base
 * This file contains the basic classes and methods for compiling Smarty templates with lexer/parser
 *
 * @package    Smarty
 * @subpackage Compiler
 * @author     Uwe Tews
 */

/**
 * Main abstract compiler class
 *
 * @package    Smarty
 * @subpackage Compiler
 */
abstract class Smarty_Internal_TemplateCompilerBase
{
    
/**
     * hash for nocache sections
     *
     * @var mixed
     */
    
private $nocache_hash null;

    
/**
     * suppress generation of nocache code
     *
     * @var bool
     */
    
public $suppressNocacheProcessing false;

    
/**
     * suppress generation of merged template code
     *
     * @var bool
     */
    
public $suppressMergedTemplates false;

    
/**
     * compile tag objects
     *
     * @var array
     */
    
public static $_tag_objects = array();

    
/**
     * tag stack
     *
     * @var array
     */
    
public $_tag_stack = array();

    
/**
     * current template
     *
     * @var Smarty_Internal_Template
     */
    
public $template null;

    
/**
     * merged templates
     *
     * @var array
     */
    
public $merged_templates = array();

    
/**
     * sources which must be compiled
     *
     * @var array
     */
    
public $sources = array();

    
/**
     * flag that we are inside {block}
     *
     * @var bool
     */
    
public $inheritance false;

    
/**
     * flag when compiling inheritance child template
     *
     * @var bool
     */
    
public $inheritance_child false;

    
/**
     * uid of templates called by {extends} for recursion check
     *
     * @var array
     */
    
public $extends_uid = array();

    
/**
     * source line offset for error messages
     *
     * @var int
     */
    
public $trace_line_offset 0;

    
/**
     * trace uid
     *
     * @var string
     */
    
public $trace_uid '';

    
/**
     * trace file path
     *
     * @var string
     */
    
public $trace_filepath '';
    
/**
     * stack for tracing file and line of nested {block} tags
     *
     * @var array
     */
    
public $trace_stack = array();

    
/**
     * plugins loaded by default plugin handler
     *
     * @var array
     */
    
public $default_handler_plugins = array();

    
/**
     * saved preprocessed modifier list
     *
     * @var mixed
     */
    
public $default_modifier_list null;

    
/**
     * force compilation of complete template as nocache
     *
     * @var boolean
     */
    
public $forceNocache false;

    
/**
     * suppress Smarty header code in compiled template
     *
     * @var bool
     */
    
public $suppressHeader false;

    
/**
     * suppress template property header code in compiled template
     *
     * @var bool
     */
    
public $suppressTemplatePropertyHeader false;

    
/**
     * suppress pre and post filter
     *
     * @var bool
     */
    
public $suppressFilter false;

    
/**
     * flag if compiled template file shall we written
     *
     * @var bool
     */
    
public $write_compiled_code true;

    
/**
     * flag if currently a template function is compiled
     *
     * @var bool
     */
    
public $compiles_template_function false;

    
/**
     * called subfuntions from template function
     *
     * @var array
     */
    
public $called_functions = array();

    
/**
     * flags for used modifier plugins
     *
     * @var array
     */
    
public $modifier_plugins = array();

    
/**
     * type of already compiled modifier
     *
     * @var array
     */
    
public $known_modifier_type = array();

    
/**
     * method to compile a Smarty template
     *
     * @param  mixed $_content template source
     *
     * @return bool  true if compiling succeeded, false if it failed
     */
    
abstract protected function doCompile($_content);

    
/**
     * Initialize compiler
     */
    
public function __construct()
    {
        
$this->nocache_hash str_replace(array('.'','), '-'uniqid(rand(), true));
    }

    
/**
     * Method to compile a Smarty template
     *
     * @param  Smarty_Internal_Template $template template object to compile
     * @param  bool                     $nocache  true is shall be compiled in nocache mode
     *
     * @return bool             true if compiling succeeded, false if it failed
     */
    
public function compileTemplate(Smarty_Internal_Template $template$nocache false)
    {
        if (empty(
$template->properties['nocache_hash'])) {
            
$template->properties['nocache_hash'] = $this->nocache_hash;
        } else {
            
$this->nocache_hash $template->properties['nocache_hash'];
        }
        
// flag for nochache sections
        
$this->nocache $nocache;
        
$this->tag_nocache false;
        
// save template object in compiler class
        
$this->template $template;
        
// reset has nocache code flag
        
$this->template->has_nocache_code false;
        
$save_source $this->template->source;
        
// template header code
        
$template_header '';
        if (!
$this->suppressHeader) {
            
$template_header .= "<?php /* Smarty version " Smarty::SMARTY_VERSION ", created on " strftime("%Y-%m-%d %H:%M:%S") . "n";
            
$template_header .= "         compiled from "" . $this->template->source->filepath . "" */ ?>n";
        }

        if (empty(
$this->template->source->components)) {
            
$this->sources = array($template->source);
        } else {
            
// we have array of inheritance templates by extends: resource
            
$this->sources array_reverse($template->source->components);
        }
        
$loop 0;
        
// the $this->sources array can get additional elements while compiling by the {extends} tag
        
while ($this->template->source array_shift($this->sources)) {
            
$this->smarty->_current_file $this->template->source->filepath;
            if (
$this->smarty->debugging) {
                
Smarty_Internal_Debug::start_compile($this->template);
            }
            
$no_sources count($this->sources);
            if (
$loop || $no_sources) {
                
$this->template->properties['file_dependency'][$this->template->source->uid] = array($this->template->source->filepath$this->template->source->timestamp$this->template->source->type);
            }
            
$loop ++;
            if (
$no_sources) {
                
$this->inheritance_child true;
            } else {
                
$this->inheritance_child false;
            }
            do {
                
$_compiled_code '';
                
// flag for aborting current and start recompile
                
$this->abort_and_recompile false;
                
// get template source
                
$_content $this->template->source->content;
                if (
$_content != '') {
                    
// run prefilter if required
                    
if ((isset($this->smarty->autoload_filters['pre']) || isset($this->smarty->registered_filters['pre'])) && !$this->suppressFilter) {
                        
$_content Smarty_Internal_Filter_Handler::runFilter('pre'$_content$template);
                    }
                    
// call compiler
                    
$_compiled_code $this->doCompile($_content);
                }
            } while (
$this->abort_and_recompile);
            if (
$this->smarty->debugging) {
                
Smarty_Internal_Debug::end_compile($this->template);
            }
        }
        
// restore source
        
$this->template->source $save_source;
        unset(
$save_source);
        
$this->smarty->_current_file $this->template->source->filepath;
        
// free memory
        
unset($this->parser->root_buffer$this->parser->current_buffer$this->parser$this->lex$this->template);
        
self::$_tag_objects = array();
        
// return compiled code to template object
        
$merged_code '';
        if (!
$this->suppressMergedTemplates && !empty($this->merged_templates)) {
            foreach (
$this->merged_templates as $code) {
                
$merged_code .= $code;
            }
        }
        
// run postfilter if required on compiled template code
        
if ((isset($this->smarty->autoload_filters['post']) || isset($this->smarty->registered_filters['post'])) && !$this->suppressFilter && $_compiled_code != '') {
            
$_compiled_code Smarty_Internal_Filter_Handler::runFilter('post'$_compiled_code$template);
        }
        if (
$this->suppressTemplatePropertyHeader) {
            
$code $_compiled_code $merged_code;
        } else {
            
$code $template_header $template->createTemplateCodeFrame($_compiled_code) . $merged_code;
        }
        
// unset content because template inheritance could have replace source with parent code
        
unset ($template->source->content);

        return 
$code;
    }

    
/**
     * Compile Tag
     * This is a call back from the lexer/parser
     * It executes the required compile plugin for the Smarty tag
     *
     * @param  string $tag       tag name
     * @param  array  $args      array with tag attributes
     * @param  array  $parameter array with compilation parameter
     *
     * @throws SmartyCompilerException
     * @throws SmartyException
     * @return string compiled code
     */
    
public function compileTag($tag$args$parameter = array())
    {
        
// $args contains the attributes parsed and compiled by the lexer/parser
        // assume that tag does compile into code, but creates no HTML output
        
$this->has_code true;
        
$this->has_output false;
        
// log tag/attributes
        
if (isset($this->smarty->get_used_tags) && $this->smarty->get_used_tags) {
            
$this->template->used_tags[] = array($tag$args);
        }
        
// check nocache option flag
        
if (in_array("'nocache'"$args) || in_array(array('nocache' => 'true'), $args)
            || 
in_array(array('nocache' => '"true"'), $args) || in_array(array('nocache' => "'true'"), $args)
        ) {
            
$this->tag_nocache true;
        }
        
// compile the smarty tag (required compile classes to compile the tag are autoloaded)
        
if (($_output $this->callTagCompiler($tag$args$parameter)) === false) {
            if (isset(
$this->smarty->template_functions[$tag])) {
                
// template defined by {template} tag
                
$args['_attr']['name'] = "'" $tag "'";
                
$_output $this->callTagCompiler('call'$args$parameter);
            }
        }
        if (
$_output !== false) {
            if (
$_output !== true) {
                
// did we get compiled code
                
if ($this->has_code) {
                    
// Does it create output?
                    
if ($this->has_output) {
                        
$_output .= "n";
                    }
                    
// return compiled code
                    
return $_output;
                }
            }
            
// tag did not produce compiled code
            
return null;
        } else {
            
// map_named attributes
            
if (isset($args['_attr'])) {
                foreach (
$args['_attr'] as $key => $attribute) {
                    if (
is_array($attribute)) {
                        
$args array_merge($args$attribute);
                    }
                }
            }
            
// not an internal compiler tag
            
if (strlen($tag) < || substr($tag, - 5) != 'close') {
                
// check if tag is a registered object
                
if (isset($this->smarty->registered_objects[$tag]) && isset($parameter['object_method'])) {
                    
$method $parameter['object_method'];
                    if (!
in_array($method$this->smarty->registered_objects[$tag][3]) &&
                        (empty(
$this->smarty->registered_objects[$tag][1]) || in_array($method$this->smarty->registered_objects[$tag][1]))
                    ) {
                        return 
$this->callTagCompiler('private_object_function'$args$parameter$tag$method);
                    } elseif (
in_array($method$this->smarty->registered_objects[$tag][3])) {
                        return 
$this->callTagCompiler('private_object_block_function'$args$parameter$tag$method);
                    } else {
                        
// throw exception
                        
$this->trigger_template_error('not allowed method "' $method '" in registered object "' $tag '"'$this->lex->taglineno);
                    }
                }
                
// check if tag is registered
                
foreach (array(Smarty::PLUGIN_COMPILERSmarty::PLUGIN_FUNCTIONSmarty::PLUGIN_BLOCK) as $plugin_type) {
                    if (isset(
$this->smarty->registered_plugins[$plugin_type][$tag])) {
                        
// if compiler function plugin call it now
                        
if ($plugin_type == Smarty::PLUGIN_COMPILER) {
                            
$new_args = array();
                            foreach (
$args as $key => $mixed) {
                                if (
is_array($mixed)) {
                                    
$new_args array_merge($new_args$mixed);
                                } else {
                                    
$new_args[$key] = $mixed;
                                }
                            }
                            if (!
$this->smarty->registered_plugins[$plugin_type][$tag][1]) {
                                
$this->tag_nocache true;
                            }
                            
$function $this->smarty->registered_plugins[$plugin_type][$tag][0];
                            if (!
is_array($function)) {
                                return 
$function($new_args$this);
                            } elseif (
is_object($function[0])) {
                                return 
$this->smarty->registered_plugins[$plugin_type][$tag][0][0]->$function[1]($new_args$this);
                            } else {
                                return 
call_user_func_array($function, array($new_args$this));
                            }
                        }
                        
// compile registered function or block function
                        
if ($plugin_type == Smarty::PLUGIN_FUNCTION || $plugin_type == Smarty::PLUGIN_BLOCK) {
                            return 
$this->callTagCompiler('private_registered_' $plugin_type$args$parameter$tag);
                        }
                    }
                }
                
// check plugins from plugins folder
                
foreach ($this->smarty->plugin_search_order as $plugin_type) {
                    if (
$plugin_type == Smarty::PLUGIN_COMPILER && $this->smarty->loadPlugin('smarty_compiler_' $tag) && (!isset($this->smarty->security_policy) || $this->smarty->security_policy->isTrustedTag($tag$this))) {
                        
$plugin 'smarty_compiler_' $tag;
                        if (
is_callable($plugin)) {
                            
// convert arguments format for old compiler plugins
                            
$new_args = array();
                            foreach (
$args as $key => $mixed) {
                                if (
is_array($mixed)) {
                                    
$new_args array_merge($new_args$mixed);
                                } else {
                                    
$new_args[$key] = $mixed;
                                }
                            }

                            return 
$plugin($new_args$this->smarty);
                        }
                        if (
class_exists($pluginfalse)) {
                            
$plugin_object = new $plugin;
                            if (
method_exists($plugin_object'compile')) {
                                return 
$plugin_object->compile($args$this);
                            }
                        }
                        throw new 
SmartyException("Plugin "{$tag}" not callable");
                    } else {
                        if (
$function $this->getPlugin($tag$plugin_type)) {
                            if (!isset(
$this->smarty->security_policy) || $this->smarty->security_policy->isTrustedTag($tag$this)) {
                                return 
$this->callTagCompiler('private_' $plugin_type '_plugin'$args$parameter$tag$function);
                            }
                        }
                    }
                }
                if (
is_callable($this->smarty->default_plugin_handler_func)) {
                    
$found false;
                    
// look for already resolved tags
                    
foreach ($this->smarty->plugin_search_order as $plugin_type) {
                        if (isset(
$this->default_handler_plugins[$plugin_type][$tag])) {
                            
$found true;
                            break;
                        }
                    }
                    if (!
$found) {
                        
// call default handler
                        
foreach ($this->smarty->plugin_search_order as $plugin_type) {
                            if (
$this->getPluginFromDefaultHandler($tag$plugin_type)) {
                                
$found true;
                                break;
                            }
                        }
                    }
                    if (
$found) {
                        
// if compiler function plugin call it now
                        
if ($plugin_type == Smarty::PLUGIN_COMPILER) {
                            
$new_args = array();
                            foreach (
$args as $mixed) {
                                
$new_args array_merge($new_args$mixed);
                            }
                            
$function $this->default_handler_plugins[$plugin_type][$tag][0];
                            if (!
is_array($function)) {
                                return 
$function($new_args$this);
                            } elseif (
is_object($function[0])) {
                                return 
$this->default_handler_plugins[$plugin_type][$tag][0][0]->$function[1]($new_args$this);
                            } else {
                                return 
call_user_func_array($function, array($new_args$this));
                            }
                        } else {
                            return 
$this->callTagCompiler('private_registered_' $plugin_type$args$parameter$tag);
                        }
                    }
                }
            } else {
                
// compile closing tag of block function
                
$base_tag substr($tag0, - 5);
                
// check if closing tag is a registered object
                
if (isset($this->smarty->registered_objects[$base_tag]) && isset($parameter['object_method'])) {
                    
$method $parameter['object_method'];
                    if (
in_array($method$this->smarty->registered_objects[$base_tag][3])) {
                        return 
$this->callTagCompiler('private_object_block_function'$args$parameter$tag$method);
                    } else {
                        
// throw exception
                        
$this->trigger_template_error('not allowed closing tag method "' $method '" in registered object "' $base_tag '"'$this->lex->taglineno);
                    }
                }
                
// registered block tag ?
                
if (isset($this->smarty->registered_plugins[Smarty::PLUGIN_BLOCK][$base_tag]) || isset($this->default_handler_plugins[Smarty::PLUGIN_BLOCK][$base_tag])) {
                    return 
$this->callTagCompiler('private_registered_block'$args$parameter$tag);
                }
                
// block plugin?
                
if ($function $this->getPlugin($base_tagSmarty::PLUGIN_BLOCK)) {
                    return 
$this->callTagCompiler('private_block_plugin'$args$parameter$tag$function);
                }
                
// registered compiler plugin ?
                
if (isset($this->smarty->registered_plugins[Smarty::PLUGIN_COMPILER][$tag])) {
                    
// if compiler function plugin call it now
                    
$args = array();
                    if (!
$this->smarty->registered_plugins[Smarty::PLUGIN_COMPILER][$tag][1]) {
                        
$this->tag_nocache true;
                    }
                    
$function $this->smarty->registered_plugins[Smarty::PLUGIN_COMPILER][$tag][0];
                    if (!
is_array($function)) {
                        return 
$function($args$this);
                    } elseif (
is_object($function[0])) {
                        return 
$this->smarty->registered_plugins[Smarty::PLUGIN_COMPILER][$tag][0][0]->$function[1]($args$this);
                    } else {
                        return 
call_user_func_array($function, array($args$this));
                    }
                }
                if (
$this->smarty->loadPlugin('smarty_compiler_' $tag)) {
                    
$plugin 'smarty_compiler_' $tag;
                    if (
is_callable($plugin)) {
                        return 
$plugin($args$this->smarty);
                    }
                    if (
class_exists($pluginfalse)) {
                        
$plugin_object = new $plugin;
                        if (
method_exists($plugin_object'compile')) {
                            return 
$plugin_object->compile($args$this);
                        }
                    }
                    throw new 
SmartyException("Plugin "{$tag}" not callable");
                }
            }
            
$this->trigger_template_error("unknown tag "" . $tag . """$this->lex->taglineno);
        }
    }

    
/**
     * lazy loads internal compile plugin for tag and calls the compile method
     * compile objects cached for reuse.
     * class name format:  Smarty_Internal_Compile_TagName
     * plugin filename format: Smarty_Internal_Tagname.php
     *
     * @param  string $tag    tag name
     * @param  array  $args   list of tag attributes
     * @param  mixed  $param1 optional parameter
     * @param  mixed  $param2 optional parameter
     * @param  mixed  $param3 optional parameter
     *
     * @return string compiled code
     */
    
public function callTagCompiler($tag$args$param1 null$param2 null$param3 null)
    {
        
// re-use object if already exists
        
if (isset(self::$_tag_objects[$tag])) {
            
// compile this tag
            
return self::$_tag_objects[$tag]->compile($args$this$param1$param2$param3);
        }
        
// lazy load internal compiler plugin
        
$class_name 'Smarty_Internal_Compile_' $tag;
        if (
$this->smarty->loadPlugin($class_name)) {
            
// check if tag allowed by security
            
if (!isset($this->smarty->security_policy) || $this->smarty->security_policy->isTrustedTag($tag$this)) {
                
// use plugin if found
                
self::$_tag_objects[$tag] = new $class_name;
                
// compile this tag
                
return self::$_tag_objects[$tag]->compile($args$this$param1$param2$param3);
            }
        }
        
// no internal compile plugin for this tag
        
return false;
    }

    
/**
     * Check for plugins and return function name
     *
     * @param         $plugin_name
     * @param  string $plugin_type type of plugin
     *
     * @return string call name of function
     */
    
public function getPlugin($plugin_name$plugin_type)
    {
        
$function null;
        if (
$this->template->caching && ($this->nocache || $this->tag_nocache)) {
            if (isset(
$this->template->required_plugins['nocache'][$plugin_name][$plugin_type])) {
                
$function $this->template->required_plugins['nocache'][$plugin_name][$plugin_type]['function'];
            } elseif (isset(
$this->template->required_plugins['compiled'][$plugin_name][$plugin_type])) {
                
$this->template->required_plugins['nocache'][$plugin_name][$plugin_type] = $this->template->required_plugins['compiled'][$plugin_name][$plugin_type];
                
$function $this->template->required_plugins['nocache'][$plugin_name][$plugin_type]['function'];
            }
        } else {
            if (isset(
$this->template->required_plugins['compiled'][$plugin_name][$plugin_type])) {
                
$function $this->template->required_plugins['compiled'][$plugin_name][$plugin_type]['function'];
            } elseif (isset(
$this->template->required_plugins['nocache'][$plugin_name][$plugin_type])) {
                
$this->template->required_plugins['compiled'][$plugin_name][$plugin_type] = $this->template->required_plugins['nocache'][$plugin_name][$plugin_type];
                
$function $this->template->required_plugins['compiled'][$plugin_name][$plugin_type]['function'];
            }
        }
        if (isset(
$function)) {
            if (
$plugin_type == 'modifier') {
                
$this->modifier_plugins[$plugin_name] = true;
            }

            return 
$function;
        }
        
// loop through plugin dirs and find the plugin
        
$function 'smarty_' $plugin_type '_' $plugin_name;
        
$file $this->smarty->loadPlugin($functionfalse);

        if (
is_string($file)) {
            if (
$this->template->caching && ($this->nocache || $this->tag_nocache)) {
                
$this->template->required_plugins['nocache'][$plugin_name][$plugin_type]['file'] = $file;
                
$this->template->required_plugins['nocache'][$plugin_name][$plugin_type]['function'] = $function;
            } else {
                
$this->template->required_plugins['compiled'][$plugin_name][$plugin_type]['file'] = $file;
                
$this->template->required_plugins['compiled'][$plugin_name][$plugin_type]['function'] = $function;
            }
            if (
$plugin_type == 'modifier') {
                
$this->modifier_plugins[$plugin_name] = true;
            }

            return 
$function;
        }
        if (
is_callable($function)) {
            
// plugin function is defined in the script
            
return $function;
        }

        return 
false;
    }

    
/**
     * Check for plugins by default plugin handler
     *
     * @param  string $tag         name of tag
     * @param  string $plugin_type type of plugin
     *
     * @return boolean true if found
     */
    
public function getPluginFromDefaultHandler($tag$plugin_type)
    {
        
$callback null;
        
$script null;
        
$cacheable true;
        
$result call_user_func_array(
            
$this->smarty->default_plugin_handler_func, array($tag$plugin_type$this->template, &$callback, &$script, &$cacheable)
        );
        if (
$result) {
            
$this->tag_nocache $this->tag_nocache || !$cacheable;
            if (
$script !== null) {
                if (
is_file($script)) {
                    if (
$this->template->caching && ($this->nocache || $this->tag_nocache)) {
                        
$this->template->required_plugins['nocache'][$tag][$plugin_type]['file'] = $script;
                        
$this->template->required_plugins['nocache'][$tag][$plugin_type]['function'] = $callback;
                    } else {
                        
$this->template->required_plugins['compiled'][$tag][$plugin_type]['file'] = $script;
                        
$this->template->required_plugins['compiled'][$tag][$plugin_type]['function'] = $callback;
                    }
                    include_once 
$script;
                } else {
                    
$this->trigger_template_error("Default plugin handler: Returned script file "{$script}" for "{$tag}" not found");
                }
            }
            if (!
is_string($callback) && !(is_array($callback) && is_string($callback[0]) && is_string($callback[1]))) {
                
$this->trigger_template_error("Default plugin handler: Returned callback for "{$tag}" must be a static function name or array of class and function name");
            }
            if (
is_callable($callback)) {
                
$this->default_handler_plugins[$plugin_type][$tag] = array($callbacktrue, array());

                return 
true;
            } else {
                
$this->trigger_template_error("Default plugin handler: Returned callback for "{$tag}" not callable");
            }
        }

        return 
false;
    }

    
/**
     * Inject inline code for nocache template sections
     * This method gets the content of each template element from the parser.
     * If the content is compiled code and it should be not cached the code is injected
     * into the rendered output.
     *
     * @param  string  $content content of template element
     * @param  boolean $is_code true if content is compiled code
     *
     * @return string  content
     */
    
public function processNocacheCode($content$is_code)
    {
        
// If the template is not evaluated and we have a nocache section and or a nocache tag
        
if ($is_code && !empty($content)) {
            
// generate replacement code
            
if ((!($this->template->source->recompiled) || $this->forceNocache) && $this->template->caching && !$this->suppressNocacheProcessing &&
                (
$this->nocache || $this->tag_nocache)
            ) {
                
$this->template->has_nocache_code true;
                
$_output addcslashes($content''\');
                $_output = str_replace("^#^", "'", 
$_output);
                
$_output = "<?php echo '/*%%SmartyNocache:{$this->nocache_hash}%%*/" . $_output . "/*/%%SmartyNocache:{$this->nocache_hash}%%*/';?>n";
                // make sure we include modifier plugins for nocache code
                foreach ($this->modifier_plugins as $plugin_name => $dummy) {
                    if (isset($this->template->required_plugins['compiled'][$plugin_name]['modifier'])) {
                        $this->template->required_plugins['nocache'][$plugin_name]['modifier'] = $this->template->required_plugins['compiled'][$plugin_name]['modifier'];
                    }
                }
            } else {
                $_output = $content;
            }
        } else {
            $_output = $content;
        }
        $this->modifier_plugins = array();
        $this->suppressNocacheProcessing = false;
        $this->tag_nocache = false;

        return $_output;
    }

    /**
     *  push current file and line offset on stack for tracing {block} source lines
     *
     * @param string      $file  new filename
     * @param string      $uid   uid of file
     * @param int         $line  line offset to source
     * @param bool $debug false debug end_compile shall not be called
     */
    public function pushTrace($file, $uid, $line, $debug = true)
    {
        if ($this->smarty->debugging && $debug) {
            Smarty_Internal_Debug::end_compile($this->template);
        }
        array_push($this->trace_stack, array($this->smarty->_current_file, $this->trace_filepath, $this->trace_uid, $this->trace_line_offset));
        $this->trace_filepath = $this->smarty->_current_file = $file;
        $this->trace_uid = $uid;
        $this->trace_line_offset = $line;
        if ($this->smarty->debugging) {
            Smarty_Internal_Debug::start_compile($this->template);
        }
    }

    /**
     *  restore file and line offset

     */
    public function popTrace()
    {
        if ($this->smarty->debugging) {
            Smarty_Internal_Debug::end_compile($this->template);
        }
        $r = array_pop($this->trace_stack);
        $this->smarty->_current_file = $r[0];
        $this->trace_filepath = $r[1];
        $this->trace_uid = $r[2];
        $this->trace_line_offset = $r[3];
        if ($this->smarty->debugging) {
            Smarty_Internal_Debug::start_compile($this->template);
        }
    }

    /**
     * display compiler error messages without dying
     * If parameter $args is empty it is a parser detected syntax error.
     * In this case the parser is called to obtain information about expected tokens.
     * If parameter $args contains a string this is used as error message
     *
     * @param  string $args individual error message or null
     * @param  string $line line-number
     *
     * @throws SmartyCompilerException when an unexpected token is found
     */
    public function trigger_template_error($args = null, $line = null)
    {
        // get template source line which has error
        if (!isset($line)) {
            $line = $this->lex->line;
        }
        //        $line += $this->trace_line_offset;
        $match = preg_split("/n/", $this->lex->data);
        $error_text = 'Syntax error in template "' . (empty($this->trace_filepath) ? $this->template->source->filepath : $this->trace_filepath) . '"  on line ' . ($line + $this->trace_line_offset) . ' "' . trim(preg_replace('![trn]+!', ' ', $match[$line - 1])) . '" ';
        if (isset($args)) {
            // individual error message
            $error_text .= $args;
        } else {
            // expected token from parser
            $error_text .= ' - Unexpected "' . $this->lex->value . '"';
            if (count($this->parser->yy_get_expected_tokens($this->parser->yymajor)) <= 4) {
                foreach ($this->parser->yy_get_expected_tokens($this->parser->yymajor) as $token) {
                    $exp_token = $this->parser->yyTokenName[$token];
                    if (isset($this->lex->smarty_token_names[$exp_token])) {
                        // token type from lexer
                        $expect[] = '"' . $this->lex->smarty_token_names[$exp_token] . '"';
                    } else {
                        // otherwise internal token name
                        $expect[] = $this->parser->yyTokenName[$token];
                    }
                }
                $error_text .= ', expected one of: ' . implode(' , ', $expect);
            }
        }
        $e = new SmartyCompilerException($error_text);
        $e->line = $line;
        $e->source = trim(preg_replace('![trn]+!', ' ', $match[$line - 1]));
        $e->desc = $args;
        $e->template = $this->template->source->filepath;
        throw $e;
    }
}
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