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<?php
/*
* This file is part of Twig.
*
* (c) Fabien Potencier
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Twig;
use Twig\Cache\CacheInterface;
use Twig\Cache\FilesystemCache;
use Twig\Cache\NullCache;
use Twig\Error\Error;
use Twig\Error\LoaderError;
use Twig\Error\RuntimeError;
use Twig\Error\SyntaxError;
use Twig\Extension\CoreExtension;
use Twig\Extension\EscaperExtension;
use Twig\Extension\ExtensionInterface;
use Twig\Extension\OptimizerExtension;
use Twig\Loader\ArrayLoader;
use Twig\Loader\ChainLoader;
use Twig\Loader\LoaderInterface;
use Twig\Node\Expression\Binary\AbstractBinary;
use Twig\Node\Expression\Unary\AbstractUnary;
use Twig\Node\ModuleNode;
use Twig\Node\Node;
use Twig\NodeVisitor\NodeVisitorInterface;
use Twig\RuntimeLoader\RuntimeLoaderInterface;
use Twig\TokenParser\TokenParserInterface;
/**
* Stores the Twig configuration and renders templates.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class Environment
{
public const VERSION = '3.5.0';
public const VERSION_ID = 30500;
public const MAJOR_VERSION = 3;
public const MINOR_VERSION = 5;
public const RELEASE_VERSION = 0;
public const EXTRA_VERSION = '';
private $charset;
private $loader;
private $debug;
private $autoReload;
private $cache;
private $lexer;
private $parser;
private $compiler;
/** @var array<string, mixed> */
private $globals = [];
private $resolvedGlobals;
private $loadedTemplates;
private $strictVariables;
private $templateClassPrefix = '__TwigTemplate_';
private $originalCache;
private $extensionSet;
private $runtimeLoaders = [];
private $runtimes = [];
private $optionsHash;
/**
* Constructor.
*
* Available options:
*
* * debug: When set to true, it automatically set "auto_reload" to true as
* well (default to false).
*
* * charset: The charset used by the templates (default to UTF-8).
*
* * cache: An absolute path where to store the compiled templates,
* a \Twig\Cache\CacheInterface implementation,
* or false to disable compilation cache (default).
*
* * auto_reload: Whether to reload the template if the original source changed.
* If you don't provide the auto_reload option, it will be
* determined automatically based on the debug value.
*
* * strict_variables: Whether to ignore invalid variables in templates
* (default to false).
*
* * autoescape: Whether to enable auto-escaping (default to html):
* * false: disable auto-escaping
* * html, js: set the autoescaping to one of the supported strategies
* * name: set the autoescaping strategy based on the template name extension
* * PHP callback: a PHP callback that returns an escaping strategy based on the template "name"
*
* * optimizations: A flag that indicates which optimizations to apply
* (default to -1 which means that all optimizations are enabled;
* set it to 0 to disable).
*/
public function __construct(LoaderInterface $loader, $options = [])
{
$this->setLoader($loader);
$options = array_merge([
'debug' => false,
'charset' => 'UTF-8',
'strict_variables' => false,
'autoescape' => 'html',
'cache' => false,
'auto_reload' => null,
'optimizations' => -1,
], $options);
$this->debug = (bool) $options['debug'];
$this->setCharset($options['charset'] ?? 'UTF-8');
$this->autoReload = null === $options['auto_reload'] ? $this->debug : (bool) $options['auto_reload'];
$this->strictVariables = (bool) $options['strict_variables'];
$this->setCache($options['cache']);
$this->extensionSet = new ExtensionSet();
$this->addExtension(new CoreExtension());
$this->addExtension(new EscaperExtension($options['autoescape']));
$this->addExtension(new OptimizerExtension($options['optimizations']));
}
/**
* Enables debugging mode.
*/
public function enableDebug()
{
$this->debug = true;
$this->updateOptionsHash();
}
/**
* Disables debugging mode.
*/
public function disableDebug()
{
$this->debug = false;
$this->updateOptionsHash();
}
/**
* Checks if debug mode is enabled.
*
* @return bool true if debug mode is enabled, false otherwise
*/
public function isDebug()
{
return $this->debug;
}
/**
* Enables the auto_reload option.
*/
public function enableAutoReload()
{
$this->autoReload = true;
}
/**
* Disables the auto_reload option.
*/
public function disableAutoReload()
{
$this->autoReload = false;
}
/**
* Checks if the auto_reload option is enabled.
*
* @return bool true if auto_reload is enabled, false otherwise
*/
public function isAutoReload()
{
return $this->autoReload;
}
/**
* Enables the strict_variables option.
*/
public function enableStrictVariables()
{
$this->strictVariables = true;
$this->updateOptionsHash();
}
/**
* Disables the strict_variables option.
*/
public function disableStrictVariables()
{
$this->strictVariables = false;
$this->updateOptionsHash();
}
/**
* Checks if the strict_variables option is enabled.
*
* @return bool true if strict_variables is enabled, false otherwise
*/
public function isStrictVariables()
{
return $this->strictVariables;
}
/**
* Gets the current cache implementation.
*
* @param bool $original Whether to return the original cache option or the real cache instance
*
* @return CacheInterface|string|false A Twig\Cache\CacheInterface implementation,
* an absolute path to the compiled templates,
* or false to disable cache
*/
public function getCache($original = true)
{
return $original ? $this->originalCache : $this->cache;
}
/**
* Sets the current cache implementation.
*
* @param CacheInterface|string|false $cache A Twig\Cache\CacheInterface implementation,
* an absolute path to the compiled templates,
* or false to disable cache
*/
public function setCache($cache)
{
if (\is_string($cache)) {
$this->originalCache = $cache;
$this->cache = new FilesystemCache($cache, $this->autoReload ? FilesystemCache::FORCE_BYTECODE_INVALIDATION : 0);
} elseif (false === $cache) {
$this->originalCache = $cache;
$this->cache = new NullCache();
} elseif ($cache instanceof CacheInterface) {
$this->originalCache = $this->cache = $cache;
} else {
throw new \LogicException('Cache can only be a string, false, or a \Twig\Cache\CacheInterface implementation.');
}
}
/**
* Gets the template class associated with the given string.
*
* The generated template class is based on the following parameters:
*
* * The cache key for the given template;
* * The currently enabled extensions;
* * Whether the Twig C extension is available or not;
* * PHP version;
* * Twig version;
* * Options with what environment was created.
*
* @param string $name The name for which to calculate the template class name
* @param int|null $index The index if it is an embedded template
*
* @internal
*/
public function getTemplateClass(string $name, int $index = null): string
{
$key = $this->getLoader()->getCacheKey($name).$this->optionsHash;
return $this->templateClassPrefix.hash(\PHP_VERSION_ID < 80100 ? 'sha256' : 'xxh128', $key).(null === $index ? '' : '___'.$index);
}
/**
* Renders a template.
*
* @param string|TemplateWrapper $name The template name
*
* @throws LoaderError When the template cannot be found
* @throws SyntaxError When an error occurred during compilation
* @throws RuntimeError When an error occurred during rendering
*/
public function render($name, array $context = []): string
{
return $this->load($name)->render($context);
}
/**
* Displays a template.
*
* @param string|TemplateWrapper $name The template name
*
* @throws LoaderError When the template cannot be found
* @throws SyntaxError When an error occurred during compilation
* @throws RuntimeError When an error occurred during rendering
*/
public function display($name, array $context = []): void
{
$this->load($name)->display($context);
}
/**
* Loads a template.
*
* @param string|TemplateWrapper $name The template name
*
* @throws LoaderError When the template cannot be found
* @throws RuntimeError When a previously generated cache is corrupted
* @throws SyntaxError When an error occurred during compilation
*/
public function load($name): TemplateWrapper
{
if ($name instanceof TemplateWrapper) {
return $name;
}
return new TemplateWrapper($this, $this->loadTemplate($this->getTemplateClass($name), $name));
}
/**
* Loads a template internal representation.
*
* This method is for internal use only and should never be called
* directly.
*
* @param string $name The template name
* @param int $index The index if it is an embedded template
*
* @throws LoaderError When the template cannot be found
* @throws RuntimeError When a previously generated cache is corrupted
* @throws SyntaxError When an error occurred during compilation
*
* @internal
*/
public function loadTemplate(string $cls, string $name, int $index = null): Template
{
$mainCls = $cls;
if (null !== $index) {
$cls .= '___'.$index;
}
if (isset($this->loadedTemplates[$cls])) {
return $this->loadedTemplates[$cls];
}
if (!class_exists($cls, false)) {
$key = $this->cache->generateKey($name, $mainCls);
if (!$this->isAutoReload() || $this->isTemplateFresh($name, $this->cache->getTimestamp($key))) {
$this->cache->load($key);
}
$source = null;
if (!class_exists($cls, false)) {
$source = $this->getLoader()->getSourceContext($name);
$content = $this->compileSource($source);
$this->cache->write($key, $content);
$this->cache->load($key);
if (!class_exists($mainCls, false)) {
/* Last line of defense if either $this->bcWriteCacheFile was used,
* $this->cache is implemented as a no-op or we have a race condition
* where the cache was cleared between the above calls to write to and load from
* the cache.
*/
eval('?>'.$content);
}
if (!class_exists($cls, false)) {
throw new RuntimeError(sprintf('Failed to load Twig template "%s", index "%s": cache might be corrupted.', $name, $index), -1, $source);
}
}
}
$this->extensionSet->initRuntime();
return $this->loadedTemplates[$cls] = new $cls($this);
}
/**
* Creates a template from source.
*
* This method should not be used as a generic way to load templates.
*
* @param string $template The template source
* @param string $name An optional name of the template to be used in error messages
*
* @throws LoaderError When the template cannot be found
* @throws SyntaxError When an error occurred during compilation
*/
public function createTemplate(string $template, string $name = null): TemplateWrapper
{
$hash = hash(\PHP_VERSION_ID < 80100 ? 'sha256' : 'xxh128', $template, false);
if (null !== $name) {
$name = sprintf('%s (string template %s)', $name, $hash);
} else {
$name = sprintf('__string_template__%s', $hash);
}
$loader = new ChainLoader([
new ArrayLoader([$name => $template]),
$current = $this->getLoader(),
]);
$this->setLoader($loader);
try {
return new TemplateWrapper($this, $this->loadTemplate($this->getTemplateClass($name), $name));
} finally {
$this->setLoader($current);
}
}
/**
* Returns true if the template is still fresh.
*
* Besides checking the loader for freshness information,
* this method also checks if the enabled extensions have
* not changed.
*
* @param int $time The last modification time of the cached template
*/
public function isTemplateFresh(string $name, int $time): bool
{
return $this->extensionSet->getLastModified() <= $time && $this->getLoader()->isFresh($name, $time);
}
/**
* Tries to load a template consecutively from an array.
*
* Similar to load() but it also accepts instances of \Twig\Template and
* \Twig\TemplateWrapper, and an array of templates where each is tried to be loaded.
*
* @param string|TemplateWrapper|array $names A template or an array of templates to try consecutively
*
* @throws LoaderError When none of the templates can be found
* @throws SyntaxError When an error occurred during compilation
*/
public function resolveTemplate($names): TemplateWrapper
{
if (!\is_array($names)) {
return $this->load($names);
}
$count = \count($names);
foreach ($names as $name) {
if ($name instanceof Template) {
return $name;
}
if ($name instanceof TemplateWrapper) {
return $name;
}
if (1 !== $count && !$this->getLoader()->exists($name)) {
continue;
}
return $this->load($name);
}
throw new LoaderError(sprintf('Unable to find one of the following templates: "%s".', implode('", "', $names)));
}
public function setLexer(Lexer $lexer)
{
$this->lexer = $lexer;
}
/**
* @throws SyntaxError When the code is syntactically wrong
*/
public function tokenize(Source $source): TokenStream
{
if (null === $this->lexer) {
$this->lexer = new Lexer($this);
}
return $this->lexer->tokenize($source);
}
public function setParser(Parser $parser)
{
$this->parser = $parser;
}
/**
* Converts a token stream to a node tree.
*
* @throws SyntaxError When the token stream is syntactically or semantically wrong
*/
public function parse(TokenStream $stream): ModuleNode
{
if (null === $this->parser) {
$this->parser = new Parser($this);
}
return $this->parser->parse($stream);
}
public function setCompiler(Compiler $compiler)
{
$this->compiler = $compiler;
}
/**
* Compiles a node and returns the PHP code.
*/
public function compile(Node $node): string
{
if (null === $this->compiler) {
$this->compiler = new Compiler($this);
}
return $this->compiler->compile($node)->getSource();
}
/**
* Compiles a template source code.
*
* @throws SyntaxError When there was an error during tokenizing, parsing or compiling
*/
public function compileSource(Source $source): string
{
try {
return $this->compile($this->parse($this->tokenize($source)));
} catch (Error $e) {
$e->setSourceContext($source);
throw $e;
} catch (\Exception $e) {
throw new SyntaxError(sprintf('An exception has been thrown during the compilation of a template ("%s").', $e->getMessage()), -1, $source, $e);
}
}
public function setLoader(LoaderInterface $loader)
{
$this->loader = $loader;
}
public function getLoader(): LoaderInterface
{
return $this->loader;
}
public function setCharset(string $charset)
{
if ('UTF8' === $charset = null === $charset ? null : strtoupper($charset)) {
// iconv on Windows requires "UTF-8" instead of "UTF8"
$charset = 'UTF-8';
}
$this->charset = $charset;
}
public function getCharset(): string
{
return $this->charset;
}
public function hasExtension(string $class): bool
{
return $this->extensionSet->hasExtension($class);
}
public function addRuntimeLoader(RuntimeLoaderInterface $loader)
{
$this->runtimeLoaders[] = $loader;
}
/**
* @template TExtension of ExtensionInterface
*
* @param class-string<TExtension> $class
*
* @return TExtension
*/
public function getExtension(string $class): ExtensionInterface
{
return $this->extensionSet->getExtension($class);
}
/**
* Returns the runtime implementation of a Twig element (filter/function/tag/test).
*
* @template TRuntime of object
*
* @param class-string<TRuntime> $class A runtime class name
*
* @return TRuntime The runtime implementation
*
* @throws RuntimeError When the template cannot be found
*/
public function getRuntime(string $class)
{
if (isset($this->runtimes[$class])) {
return $this->runtimes[$class];
}
foreach ($this->runtimeLoaders as $loader) {
if (null !== $runtime = $loader->load($class)) {
return $this->runtimes[$class] = $runtime;
}
}
throw new RuntimeError(sprintf('Unable to load the "%s" runtime.', $class));
}
public function addExtension(ExtensionInterface $extension)
{
$this->extensionSet->addExtension($extension);
$this->updateOptionsHash();
}
/**
* @param ExtensionInterface[] $extensions An array of extensions
*/
public function setExtensions(array $extensions)
{
$this->extensionSet->setExtensions($extensions);
$this->updateOptionsHash();
}
/**
* @return ExtensionInterface[] An array of extensions (keys are for internal usage only and should not be relied on)
*/
public function getExtensions(): array
{
return $this->extensionSet->getExtensions();
}
public function addTokenParser(TokenParserInterface $parser)
{
$this->extensionSet->addTokenParser($parser);
}
/**
* @return TokenParserInterface[]
*
* @internal
*/
public function getTokenParsers(): array
{
return $this->extensionSet->getTokenParsers();
}
/**
* @internal
*/
public function getTokenParser(string $name): ?TokenParserInterface
{
return $this->extensionSet->getTokenParser($name);
}
public function registerUndefinedTokenParserCallback(callable $callable): void
{
$this->extensionSet->registerUndefinedTokenParserCallback($callable);
}
public function addNodeVisitor(NodeVisitorInterface $visitor)
{
$this->extensionSet->addNodeVisitor($visitor);
}
/**
* @return NodeVisitorInterface[]
*
* @internal
*/
public function getNodeVisitors(): array
{
return $this->extensionSet->getNodeVisitors();
}
public function addFilter(TwigFilter $filter)
{
$this->extensionSet->addFilter($filter);
}
/**
* @internal
*/
public function getFilter(string $name): ?TwigFilter
{
return $this->extensionSet->getFilter($name);
}
public function registerUndefinedFilterCallback(callable $callable): void
{
$this->extensionSet->registerUndefinedFilterCallback($callable);
}
/**
* Gets the registered Filters.
*
* Be warned that this method cannot return filters defined with registerUndefinedFilterCallback.
*
* @return TwigFilter[]
*
* @see registerUndefinedFilterCallback
*
* @internal
*/
public function getFilters(): array
{
return $this->extensionSet->getFilters();
}
public function addTest(TwigTest $test)
{
$this->extensionSet->addTest($test);
}
/**
* @return TwigTest[]
*
* @internal
*/
public function getTests(): array
{
return $this->extensionSet->getTests();
}
/**
* @internal
*/
public function getTest(string $name): ?TwigTest
{
return $this->extensionSet->getTest($name);
}
public function addFunction(TwigFunction $function)
{
$this->extensionSet->addFunction($function);
}
/**
* @internal
*/
public function getFunction(string $name): ?TwigFunction
{
return $this->extensionSet->getFunction($name);
}
public function registerUndefinedFunctionCallback(callable $callable): void
{
$this->extensionSet->registerUndefinedFunctionCallback($callable);
}
/**
* Gets registered functions.
*
* Be warned that this method cannot return functions defined with registerUndefinedFunctionCallback.
*
* @return TwigFunction[]
*
* @see registerUndefinedFunctionCallback
*
* @internal
*/
public function getFunctions(): array
{
return $this->extensionSet->getFunctions();
}
/**
* Registers a Global.
*
* New globals can be added before compiling or rendering a template;
* but after, you can only update existing globals.
*
* @param mixed $value The global value
*/
public function addGlobal(string $name, $value)
{
if ($this->extensionSet->isInitialized() && !\array_key_exists($name, $this->getGlobals())) {
throw new \LogicException(sprintf('Unable to add global "%s" as the runtime or the extensions have already been initialized.', $name));
}
if (null !== $this->resolvedGlobals) {
$this->resolvedGlobals[$name] = $value;
} else {
$this->globals[$name] = $value;
}
}
/**
* @internal
*
* @return array<string, mixed>
*/
public function getGlobals(): array
{
if ($this->extensionSet->isInitialized()) {
if (null === $this->resolvedGlobals) {
$this->resolvedGlobals = array_merge($this->extensionSet->getGlobals(), $this->globals);
}
return $this->resolvedGlobals;
}
return array_merge($this->extensionSet->getGlobals(), $this->globals);
}
public function mergeGlobals(array $context): array
{
// we don't use array_merge as the context being generally
// bigger than globals, this code is faster.
foreach ($this->getGlobals() as $key => $value) {
if (!\array_key_exists($key, $context)) {
$context[$key] = $value;
}
}
return $context;
}
/**
* @internal
*
* @return array<string, array{precedence: int, class: class-string<AbstractUnary>}>
*/
public function getUnaryOperators(): array
{
return $this->extensionSet->getUnaryOperators();
}
/**
* @internal
*
* @return array<string, array{precedence: int, class: class-string<AbstractBinary>, associativity: ExpressionParser::OPERATOR_*}>
*/
public function getBinaryOperators(): array
{
return $this->extensionSet->getBinaryOperators();
}
private function updateOptionsHash(): void
{
$this->optionsHash = implode(':', [
$this->extensionSet->getSignature(),
\PHP_MAJOR_VERSION,
\PHP_MINOR_VERSION,
self::VERSION,
(int) $this->debug,
(int) $this->strictVariables,
]);
}
}