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Editing: smarty_internal_compile_function.php

<?php
/**
 * Smarty Internal Plugin Compile Function
 * Compiles the {function} {/function} tags
 *
 * @package    Smarty
 * @subpackage Compiler
 * @author     Uwe Tews
 */

/**
 * Smarty Internal Plugin Compile Function Class
 *
 * @package    Smarty
 * @subpackage Compiler
 */
class Smarty_Internal_Compile_Function extends Smarty_Internal_CompileBase
{
    /**
     * Attribute definition: Overwrites base class.
     *
     * @var array
     * @see Smarty_Internal_CompileBase
     */
    public $required_attributes = array('name');

/**
     * Attribute definition: Overwrites base class.
     *
     * @var array
     * @see Smarty_Internal_CompileBase
     */
    public $shorttag_order = array('name');

/**
     * Attribute definition: Overwrites base class.
     *
     * @var array
     * @see Smarty_Internal_CompileBase
     */
    public $optional_attributes = array('_any');

/**
     * Compiles code for the {function} tag
     *
     * @param array                                 $args     array with attributes from parser
     * @param \Smarty_Internal_TemplateCompilerBase $compiler compiler object
     *
     * @return bool true
     * @throws \SmartyCompilerException
     */
    public function compile($args, Smarty_Internal_TemplateCompilerBase $compiler)
    {
        // check and get attributes
        $_attr = $this->getAttributes($compiler, $args);
        if ($_attr[ 'nocache' ] === true) {
            $compiler->trigger_template_error('nocache option not allowed', null, true);
        }
        unset($_attr[ 'nocache' ]);
        $_name = trim($_attr[ 'name' ], '\'"');

if (!preg_match('/^[a-zA-Z0-9_\x80-\xff]+$/', $_name)) {
	        $compiler->trigger_template_error("Function name contains invalid characters: {$_name}", null, true);
        }

$compiler->parent_compiler->tpl_function[ $_name ] = array();
        $save = array(
            $_attr, $compiler->parser->current_buffer, $compiler->template->compiled->has_nocache_code,
            $compiler->template->caching
        );
        $this->openTag($compiler, 'function', $save);
        // Init temporary context
        $compiler->parser->current_buffer = new Smarty_Internal_ParseTree_Template();
        $compiler->template->compiled->has_nocache_code = false;
        $compiler->saveRequiredPlugins(true);
        return true;
    }
}

/**
 * Smarty Internal Plugin Compile Functionclose Class
 *
 * @package    Smarty
 * @subpackage Compiler
 */
class Smarty_Internal_Compile_Functionclose extends Smarty_Internal_CompileBase
{
    /**
     * Compiler object
     *
     * @var object
     */
    private $compiler = null;

/**
     * Compiles code for the {/function} tag
     *
     * @param array                                        $args     array with attributes from parser
     * @param object|\Smarty_Internal_TemplateCompilerBase $compiler compiler object
     *
     * @return bool true
     */
    public function compile($args, Smarty_Internal_TemplateCompilerBase $compiler)
    {
        $this->compiler = $compiler;
        $saved_data = $this->closeTag($compiler, array('function'));
        $_attr = $saved_data[ 0 ];
        $_name = trim($_attr[ 'name' ], '\'"');
        $compiler->parent_compiler->tpl_function[ $_name ][ 'compiled_filepath' ] =
            $compiler->parent_compiler->template->compiled->filepath;
        $compiler->parent_compiler->tpl_function[ $_name ][ 'uid' ] = $compiler->template->source->uid;
        $_parameter = $_attr;
        unset($_parameter[ 'name' ]);
        // default parameter
        $_paramsArray = array();
        foreach ($_parameter as $_key => $_value) {
            if (is_int($_key)) {
                $_paramsArray[] = "$_key=>$_value";
            } else {
                $_paramsArray[] = "'$_key'=>$_value";
            }
        }
        if (!empty($_paramsArray)) {
            $_params = 'array(' . implode(',', $_paramsArray) . ')';
            $_paramsCode = "\$params = array_merge($_params, \$params);\n";
        } else {
            $_paramsCode = '';
        }
        $_functionCode = $compiler->parser->current_buffer;
        // setup buffer for template function code
        $compiler->parser->current_buffer = new Smarty_Internal_ParseTree_Template();
        $_funcName = "smarty_template_function_{$_name}_{$compiler->template->compiled->nocache_hash}";
        $_funcNameCaching = $_funcName . '_nocache';
        if ($compiler->template->compiled->has_nocache_code) {
            $compiler->parent_compiler->tpl_function[ $_name ][ 'call_name_caching' ] = $_funcNameCaching;
            $output = "<?php\n";
            $output .= $compiler->cStyleComment(" {$_funcNameCaching} ") . "\n";
            $output .= "if (!function_exists('{$_funcNameCaching}')) {\n";
            $output .= "function {$_funcNameCaching} (Smarty_Internal_Template \$_smarty_tpl,\$params) {\n";
            $output .= "ob_start();\n";
            $output .= $compiler->compileRequiredPlugins();
            $output .= "\$_smarty_tpl->compiled->has_nocache_code = true;\n";
            $output .= $_paramsCode;
            $output .= "foreach (\$params as \$key => \$value) {\n\$_smarty_tpl->tpl_vars[\$key] = new Smarty_Variable(\$value, \$_smarty_tpl->isRenderingCache);\n}\n";
            $output .= "\$params = var_export(\$params, true);\n";
            $output .= "echo \"/*%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%*/<?php ";
            $output .= "\\\$_smarty_tpl->smarty->ext->_tplFunction->saveTemplateVariables(\\\$_smarty_tpl, '{$_name}');\nforeach (\$params as \\\$key => \\\$value) {\n\\\$_smarty_tpl->tpl_vars[\\\$key] = new Smarty_Variable(\\\$value, \\\$_smarty_tpl->isRenderingCache);\n}\n?>";
            $output .= "/*/%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%*/\";?>";
            $compiler->parser->current_buffer->append_subtree(
                $compiler->parser,
                new Smarty_Internal_ParseTree_Tag(
                    $compiler->parser,
                    $output
                )
            );
            $compiler->parser->current_buffer->append_subtree($compiler->parser, $_functionCode);
            $output = "<?php echo \"/*%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%*/<?php ";
            $output .= "\\\$_smarty_tpl->smarty->ext->_tplFunction->restoreTemplateVariables(\\\$_smarty_tpl, '{$_name}');?>\n";
            $output .= "/*/%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%*/\";\n?>";
            $output .= "<?php echo str_replace('{$compiler->template->compiled->nocache_hash}', \$_smarty_tpl->compiled->nocache_hash, ob_get_clean());\n";
            $output .= "}\n}\n";
            $output .= $compiler->cStyleComment("/ {$_funcName}_nocache ") . "\n\n";
            $output .= "?>\n";
            $compiler->parser->current_buffer->append_subtree(
                $compiler->parser,
                new Smarty_Internal_ParseTree_Tag(
                    $compiler->parser,
                    $output
                )
            );
            $_functionCode = new Smarty_Internal_ParseTree_Tag(
                $compiler->parser,
                preg_replace_callback(
                    "/((<\?php )?echo '\/\*%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%\*\/([\S\s]*?)\/\*\/%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%\*\/';(\?>\n)?)/",
                    array($this, 'removeNocache'),
                    $_functionCode->to_smarty_php($compiler->parser)
                )
            );
        }
        $compiler->parent_compiler->tpl_function[ $_name ][ 'call_name' ] = $_funcName;
        $output = "<?php\n";
        $output .= $compiler->cStyleComment(" {$_funcName} ") . "\n";
        $output .= "if (!function_exists('{$_funcName}')) {\n";
        $output .= "function {$_funcName}(Smarty_Internal_Template \$_smarty_tpl,\$params) {\n";
        $output .= $_paramsCode;
        $output .= "foreach (\$params as \$key => \$value) {\n\$_smarty_tpl->tpl_vars[\$key] = new Smarty_Variable(\$value, \$_smarty_tpl->isRenderingCache);\n}\n";
        $output .= $compiler->compileCheckPlugins(array_merge($compiler->required_plugins[ 'compiled' ],
            $compiler->required_plugins[ 'nocache' ]));
        $output .= "?>\n";
        $compiler->parser->current_buffer->append_subtree(
            $compiler->parser,
            new Smarty_Internal_ParseTree_Tag(
                $compiler->parser,
                $output
            )
        );
        $compiler->parser->current_buffer->append_subtree($compiler->parser, $_functionCode);
        $output = "<?php\n}}\n";
        $output .= $compiler->cStyleComment("/ {$_funcName} ") . "\n\n";
        $output .= "?>\n";
        $compiler->parser->current_buffer->append_subtree(
            $compiler->parser,
            new Smarty_Internal_ParseTree_Tag(
                $compiler->parser,
                $output
            )
        );
        $compiler->parent_compiler->blockOrFunctionCode .= $compiler->parser->current_buffer->to_smarty_php($compiler->parser);
        // restore old buffer
        $compiler->parser->current_buffer = $saved_data[ 1 ];
        // restore old status
        $compiler->restoreRequiredPlugins();
        $compiler->template->compiled->has_nocache_code = $saved_data[ 2 ];
        $compiler->template->caching = $saved_data[ 3 ];
        return true;
    }

/**
     * Remove nocache code
     *
     * @param $match
     *
     * @return string
     */
    public function removeNocache($match)
    {
        $code =
            preg_replace(
                "/((<\?php )?echo '\/\*%%SmartyNocache:{$this->compiler->template->compiled->nocache_hash}%%\*\/)|(\/\*\/%%SmartyNocache:{$this->compiler->template->compiled->nocache_hash}%%\*\/';(\?>\n)?)/",
                '',
                $match[ 0 ]
            );
        $code = str_replace(array('\\\'', '\\\\\''), array('\'', '\\\''), $code);
        return $code;
    }
}

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