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Engine.php
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/
Engine.php
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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;
/**
* Templating engine Latte.
*/
class Engine
{
use Strict;
public const VERSION = '3.3.0-dev';
public const VERSION_ID = 30000;
/** Content types */
public const
CONTENT_HTML = 'html',
CONTENT_XHTML = 'xhtml',
CONTENT_XML = 'xml',
CONTENT_JS = 'js',
CONTENT_CSS = 'css',
CONTENT_ICAL = 'ical',
CONTENT_TEXT = 'text';
/** @var callable[] */
public $onCompile = [];
/** @var Parser|null */
private $parser;
/** @var Compiler|null */
private $compiler;
/** @var Loader|null */
private $loader;
/** @var Runtime\FilterExecutor */
private $filters;
/** @var \stdClass */
private $functions;
/** @var array */
private $providers = [];
/** @var string */
private $contentType = self::CONTENT_HTML;
/** @var string|null */
private $tempDirectory;
/** @var bool */
private $autoRefresh = true;
/** @var bool */
private $strictTypes = false;
/** @var Policy|null */
private $policy;
/** @var bool */
private $sandboxed = false;
public function __construct()
{
$defaults = new Runtime\Defaults;
$this->filters = new Runtime\FilterExecutor($defaults->getFilters());
$this->functions = new \stdClass;
}
/**
* Renders template to output.
* @param object|array $params
*/
public function render(string $name, $params = [], string $block = null): void
{
$this->createTemplate($name, (array) $params + ($block ? ['_renderblock' => $block] : []))
->render();
}
/**
* Renders template to string.
* @param object|array $params
*/
public function renderToString(string $name, $params = [], string $block = null): string
{
$template = $this->createTemplate($name, (array) $params + ($block ? ['_renderblock' => $block] : []));
return $template->capture([$template, 'render']);
}
/**
* Creates template object.
*/
public function createTemplate(string $name, array $params = []): Runtime\Template
{
$class = $this->getTemplateClass($name);
if (!class_exists($class, false)) {
$this->loadTemplate($name);
}
$this->providers['_fn'] = $this->functions;
return new $class($this, $params, $this->filters, $this->providers, $name, $this->sandboxed ? $this->policy : null);
}
/**
* Compiles template to PHP code.
*/
public function compile(string $name): string
{
foreach ($this->onCompile ?: [] as $cb) {
(Helpers::checkCallback($cb))($this);
}
$this->onCompile = [];
$source = $this->getLoader()->getContent($name);
try {
$tokens = $this->getParser()
->setContentType($this->contentType)
->parse($source);
$code = $this->getCompiler()
->setContentType($this->contentType)
->setFunctions(array_keys((array) $this->functions))
->setPolicy($this->sandboxed ? $this->policy : null)
->compile($tokens, $this->getTemplateClass($name));
} catch (\Exception $e) {
if (!$e instanceof CompileException) {
$e = new CompileException($e instanceof SecurityViolation ? $e->getMessage() : "Thrown exception '{$e->getMessage()}'", 0, $e);
}
$line = isset($tokens) ? $this->getCompiler()->getLine() : $this->getParser()->getLine();
throw $e->setSource($source, $line, $name);
}
if ($this->strictTypes) {
$code = "<?php\ndeclare(strict_types=1);\n?>" . $code;
}
if (!preg_match('#\n|\?#', $name)) {
$code = "<?php\n// source: $name\n?>" . $code;
}
$code = PhpHelpers::reformatCode($code);
return $code;
}
/**
* Compiles template to cache.
* @throws \LogicException
*/
public function warmupCache(string $name): void
{
if (!$this->tempDirectory) {
throw new \LogicException('Path to temporary directory is not set.');
}
$class = $this->getTemplateClass($name);
if (!class_exists($class, false)) {
$this->loadTemplate($name);
}
}
private function loadTemplate(string $name): void
{
if (!$this->tempDirectory) {
$code = $this->compile($name);
if (@eval(substr($code, 5)) === false) { // @ is escalated to exception, substr removes <?php
throw (new CompileException('Error in template: ' . error_get_last()['message']))
->setSource($code, error_get_last()['line'], "$name (compiled)");
}
return;
}
$file = $this->getCacheFile($name);
if (!$this->isExpired($file, $name) && (@include $file) !== false) { // @ - file may not exist
return;
}
if (!is_dir($this->tempDirectory) && !@mkdir($this->tempDirectory) && !is_dir($this->tempDirectory)) { // @ - dir may already exist
throw new \RuntimeException("Unable to create directory '$this->tempDirectory'. " . error_get_last()['message']);
}
$handle = @fopen("$file.lock", 'c+'); // @ is escalated to exception
if (!$handle) {
throw new \RuntimeException("Unable to create file '$file.lock'. " . error_get_last()['message']);
} elseif (!@flock($handle, LOCK_EX)) { // @ is escalated to exception
throw new \RuntimeException("Unable to acquire exclusive lock on '$file.lock'. " . error_get_last()['message']);
}
if (!is_file($file) || $this->isExpired($file, $name)) {
$code = $this->compile($name);
if (file_put_contents("$file.tmp", $code) !== strlen($code) || !rename("$file.tmp", $file)) {
@unlink("$file.tmp"); // @ - file may not exist
throw new \RuntimeException("Unable to create '$file'.");
} elseif (function_exists('opcache_invalidate')) {
@opcache_invalidate($file, true); // @ can be restricted
}
}
if ((include $file) === false) {
throw new \RuntimeException("Unable to load '$file'.");
}
flock($handle, LOCK_UN);
fclose($handle);
@unlink("$file.lock"); // @ file may become locked on Windows
}
private function isExpired(string $file, string $name): bool
{
return $this->autoRefresh && $this->getLoader()->isExpired($name, (int) @filemtime($file)); // @ - file may not exist
}
public function getCacheFile(string $name): string
{
$hash = substr($this->getTemplateClass($name), 8);
$base = preg_match('#([/\\\\][\w@.-]{3,35}){1,3}$#D', $name, $m)
? preg_replace('#[^\w@.-]+#', '-', substr($m[0], 1)) . '--'
: '';
return "$this->tempDirectory/$base$hash.php";
}
public function getTemplateClass(string $name): string
{
$key = $this->getLoader()->getUniqueId($name) . "\00" . self::VERSION . "\00" . (int) $this->sandboxed;
return 'Template' . substr(md5($key), 0, 10);
}
/**
* Registers run-time filter.
* @return static
*/
public function addFilter(?string $name, callable $callback)
{
$this->filters->add($name, $callback);
return $this;
}
/**
* Returns all run-time filters.
* @return string[]
*/
public function getFilters(): array
{
return $this->filters->getAll();
}
/**
* Call a run-time filter.
* @return mixed
*/
public function invokeFilter(string $name, array $args)
{
return ($this->filters->$name)(...$args);
}
/**
* Adds new macro.
* @return static
*/
public function addMacro(string $name, Macro $macro)
{
$this->getCompiler()->addMacro($name, $macro);
return $this;
}
/**
* Registers run-time function.
* @return static
*/
public function addFunction(string $name, callable $callback)
{
$this->functions->$name = $callback;
return $this;
}
/**
* Adds new provider.
* @return static
*/
public function addProvider(string $name, $value)
{
$this->providers[$name] = $value;
return $this;
}
/**
* Returns all providers.
*/
public function getProviders(): array
{
return $this->providers;
}
/** @return static */
public function setPolicy(?Policy $policy)
{
$this->policy = $policy;
return $this;
}
/** @return static */
public function setSandboxMode(bool $on = true)
{
$this->sandboxed = $on;
return $this;
}
/** @return static */
public function setContentType(string $type)
{
$this->contentType = $type;
return $this;
}
/**
* Sets path to temporary directory.
* @return static
*/
public function setTempDirectory(?string $path)
{
$this->tempDirectory = $path;
return $this;
}
/**
* Sets auto-refresh mode.
* @return static
*/
public function setAutoRefresh(bool $on = true)
{
$this->autoRefresh = $on;
return $this;
}
/**
* Enables declare(strict_types=1) in templates.
* @return static
*/
public function setStrictTypes(bool $on = true)
{
$this->strictTypes = $on;
return $this;
}
public function getParser(): Parser
{
if (!$this->parser) {
$this->parser = new Parser;
}
return $this->parser;
}
public function getCompiler(): Compiler
{
if (!$this->compiler) {
$this->compiler = new Compiler;
Macros\CoreMacros::install($this->compiler);
Macros\BlockMacros::install($this->compiler);
}
return $this->compiler;
}
/** @return static */
public function setLoader(Loader $loader)
{
$this->loader = $loader;
return $this;
}
public function getLoader(): Loader
{
if (!$this->loader) {
$this->loader = new Loaders\FileLoader;
}
return $this->loader;
}
}