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<?php
/**
* This file is part of the Latte (https://latte.nette.org)
* Copyright (c) 2008 David Grudl (https://davidgrudl.com)
*/
declare(strict_types=1);
namespace Latte\Runtime;
use Latte;
/**
* Snippet driver
* @internal
*/
class SnippetDriver
{
use Latte\Strict;
public const
TYPE_STATIC = 'static',
TYPE_DYNAMIC = 'dynamic',
TYPE_AREA = 'area';
/** @var array<array{string, bool}> */
private $stack = [];
/** @var int */
private $nestingLevel = 0;
/** @var bool */
private $renderingSnippets = false;
/** @var SnippetBridge */
private $bridge;
public function __construct(SnippetBridge $bridge)
{
$this->bridge = $bridge;
}
public function enter(string $name, string $type): void
{
if (!$this->renderingSnippets) {
if ($type === self::TYPE_DYNAMIC && $this->nestingLevel === 0) {
trigger_error('Dynamic snippets are allowed only inside static snippet/snippetArea.', E_USER_WARNING);
}
$this->nestingLevel++;
return;
}
$obStarted = false;
if (
($this->nestingLevel === 0 && $this->bridge->needsRedraw($name))
|| ($type === self::TYPE_DYNAMIC && ($previous = end($this->stack)) && $previous[1] === true)
) {
ob_start(function () {});
$this->nestingLevel = $type === self::TYPE_AREA ? 0 : 1;
$obStarted = true;
} elseif ($this->nestingLevel > 0) {
$this->nestingLevel++;
}
$this->stack[] = [$name, $obStarted];
$this->bridge->markRedrawn($name);
}
public function leave(): void
{
if (!$this->renderingSnippets) {
$this->nestingLevel--;
return;
}
[$name, $obStarted] = array_pop($this->stack);
if ($this->nestingLevel > 0 && --$this->nestingLevel === 0) {
$content = ob_get_clean();
$this->bridge->addSnippet($name, $content);
} elseif ($obStarted) { // dynamic snippet wrapper or snippet area
ob_end_clean();
}
}
public function getHtmlId(string $name): string
{
return $this->bridge->getHtmlId($name);
}
/**
* @param Block[] $blocks
* @param mixed[] $params
*/
public function renderSnippets(array $blocks, array $params): bool
{
if ($this->renderingSnippets || !$this->bridge->isSnippetMode()) {
return false;
}
$this->renderingSnippets = true;
$this->bridge->setSnippetMode(false);
foreach ($blocks as $name => $block) {
if (!$this->bridge->needsRedraw($name)) {
continue;
}
$function = reset($block->functions);
$function($params);
}
$this->bridge->setSnippetMode(true);
$this->bridge->renderChildren();
return true;
}
}