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<?php
/**
* Smarty Internal Plugin Compile Block Plugin
* Compiles code for the execution of block plugin
*
* @author Uwe Tews
*/
namespace Smarty\Compile;
use Smarty\Compiler\Template;
use Smarty\CompilerException;
use Smarty\Exception;
use Smarty\Smarty;
/**
* Smarty Internal Plugin Compile Block Plugin Class
*
*/
class BlockCompiler extends Base {
/**
* Attribute definition: Overwrites base class.
*
* @var array
* @see BasePlugin
*/
protected $optional_attributes = ['_any'];
/**
* nesting level
*
* @var int
*/
private $nesting = 0;
/**
* Compiles code for the execution of block plugin
*
* @param array $args array with attributes from parser
* @param Template $compiler compiler object
* @param array $parameter array with compilation parameter
* @param string $tag name of block plugin
* @param string $function PHP function name
*
* @return string compiled code
* @throws CompilerException
* @throws Exception
*/
public function compile($args, Template $compiler, $parameter = [], $tag = null, $function = null): string
{
if (!isset($tag[5]) || substr($tag, -5) !== 'close') {
$output = $this->compileOpeningTag($compiler, $args, $tag, $function);
} else {
$output = $this->compileClosingTag($compiler, $tag, $parameter, $function);
}
return $output;
}
/**
* Compiles code for the {$smarty.block.child} property
*
* @param Template $compiler compiler object
*
* @return string compiled code
* @throws CompilerException
*/
public function compileChild(\Smarty\Compiler\Template $compiler) {
if (!isset($compiler->_cache['blockNesting'])) {
$compiler->trigger_template_error(
"'{\$smarty.block.child}' used outside {block} tags ",
$compiler->getParser()->lex->taglineno
);
}
$compiler->_cache['blockParams'][$compiler->_cache['blockNesting']]['callsChild'] = true;
$compiler->suppressNocacheProcessing = true;
$output = "<?php \n";
$output .= '$_smarty_tpl->getInheritance()->callChild($_smarty_tpl, $this' . ");\n";
$output .= "?>\n";
return $output;
}
/**
* Compiles code for the {$smarty.block.parent} property
*
* @param Template $compiler compiler object
*
* @return string compiled code
* @throws CompilerException
*/
public function compileParent(\Smarty\Compiler\Template $compiler) {
if (!isset($compiler->_cache['blockNesting'])) {
$compiler->trigger_template_error(
"'{\$smarty.block.parent}' used outside {block} tags ",
$compiler->getParser()->lex->taglineno
);
}
$compiler->suppressNocacheProcessing = true;
$output = "<?php \n";
$output .= '$_smarty_tpl->getInheritance()->callParent($_smarty_tpl, $this' . ");\n";
$output .= "?>\n";
return $output;
}
/**
* Returns true if this block is cacheable.
*
* @param Smarty $smarty
* @param $function
*
* @return bool
*/
protected function blockIsCacheable(\Smarty\Smarty $smarty, $function): bool {
return $smarty->getBlockHandler($function)->isCacheable();
}
/**
* Returns the code used for the isset check
*
* @param string $tag tag name
* @param string $function base tag or method name
*
* @return string
*/
protected function getIsCallableCode($tag, $function): string {
return "\$_smarty_tpl->getSmarty()->getBlockHandler(" . var_export($function, true) . ")";
}
/**
* Returns the full code used to call the callback
*
* @param string $tag tag name
* @param string $function base tag or method name
*
* @return string
*/
protected function getFullCallbackCode($tag, $function): string {
return "\$_smarty_tpl->getSmarty()->getBlockHandler(" . var_export($function, true) . ")->handle";
}
/**
* @param Template $compiler
* @param array $args
* @param string|null $tag
* @param string|null $function
*
* @return string
*/
private function compileOpeningTag(Template $compiler, array $args, ?string $tag, ?string $function): string {
// check and get attributes
$_attr = $this->getAttributes($compiler, $args);
$this->nesting++;
unset($_attr['nocache']);
$_params = 'array(' . implode(',', $this->formatParamsArray($_attr)) . ')';
if (!$this->blockIsCacheable($compiler->getSmarty(), $function)) {
$compiler->tag_nocache = true;
}
if ($compiler->tag_nocache) {
// push a {nocache} tag onto the stack to prevent caching of this block
$this->openTag($compiler, 'nocache');
}
$this->openTag($compiler, $tag, [$_params, $compiler->tag_nocache]);
// compile code
$output = "<?php \$_block_repeat=true;
if (!" . $this->getIsCallableCode($tag, $function) .") {\nthrow new \\Smarty\\Exception('block tag \'{$tag}\' not callable or registered');\n}\n
echo " . $this->getFullCallbackCode($tag, $function) . "({$_params}, null, \$_smarty_tpl, \$_block_repeat);
while (\$_block_repeat) {
ob_start();
?>";
return $output;
}
/**
* @param Template $compiler
* @param string $tag
* @param array $parameter
* @param string|null $function
*
* @return string
* @throws CompilerException
* @throws Exception
*/
private function compileClosingTag(Template $compiler, string $tag, array $parameter, ?string $function): string {
// closing tag of block plugin, restore nocache
$base_tag = substr($tag, 0, -5);
[$_params, $nocache_pushed] = $this->closeTag($compiler, $base_tag);
// compile code
if (!isset($parameter['modifier_list'])) {
$mod_pre = $mod_post = $mod_content = '';
$mod_content2 = 'ob_get_clean()';
} else {
$mod_content2 = "\$_block_content{$this->nesting}";
$mod_content = "\$_block_content{$this->nesting} = ob_get_clean();\n";
$mod_pre = "ob_start();\n";
$mod_post = 'echo ' . $compiler->compileModifier($parameter['modifier_list'], 'ob_get_clean()')
. ";\n";
}
$output = "<?php {$mod_content}\$_block_repeat=false;\n{$mod_pre}";
$callback = $this->getFullCallbackCode($base_tag, $function);
$output .= "echo {$callback}({$_params}, {$mod_content2}, \$_smarty_tpl, \$_block_repeat);\n";
$output .= "{$mod_post}}\n?>";
if ($nocache_pushed) {
// pop the pushed virtual nocache tag
$this->closeTag($compiler, 'nocache');
$compiler->tag_nocache = true;
}
return $output;
}
}
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