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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\Error\RuntimeError;
use Twig\Extension\ExtensionInterface;
use Twig\Extension\GlobalsInterface;
use Twig\Extension\StagingExtension;
use Twig\Node\Expression\Binary\AbstractBinary;
use Twig\Node\Expression\Unary\AbstractUnary;
use Twig\NodeVisitor\NodeVisitorInterface;
use Twig\TokenParser\TokenParserInterface;
/**
* @author Fabien Potencier <fabien@symfony.com>
*
* @internal
*/
final class ExtensionSet
{
private $extensions;
private $initialized = false;
private $runtimeInitialized = false;
private $staging;
private $parsers;
private $visitors;
/** @var array<string, TwigFilter> */
private $filters;
/** @var array<string, TwigTest> */
private $tests;
/** @var array<string, TwigFunction> */
private $functions;
/** @var array<string, array{precedence: int, class: class-string<AbstractUnary>}> */
private $unaryOperators;
/** @var array<string, array{precedence: int, class: class-string<AbstractBinary>, associativity: ExpressionParser::OPERATOR_*}> */
private $binaryOperators;
/** @var array<string, mixed> */
private $globals;
private $functionCallbacks = [];
private $filterCallbacks = [];
private $parserCallbacks = [];
private $lastModified = 0;
public function __construct()
{
$this->staging = new StagingExtension();
}
public function initRuntime()
{
$this->runtimeInitialized = true;
}
public function hasExtension(string $class): bool
{
return isset($this->extensions[ltrim($class, '\\')]);
}
public function getExtension(string $class): ExtensionInterface
{
$class = ltrim($class, '\\');
if (!isset($this->extensions[$class])) {
throw new RuntimeError(sprintf('The "%s" extension is not enabled.', $class));
}
return $this->extensions[$class];
}
/**
* @param ExtensionInterface[] $extensions
*/
public function setExtensions(array $extensions): void
{
foreach ($extensions as $extension) {
$this->addExtension($extension);
}
}
/**
* @return ExtensionInterface[]
*/
public function getExtensions(): array
{
return $this->extensions;
}
public function getSignature(): string
{
return json_encode(array_keys($this->extensions));
}
public function isInitialized(): bool
{
return $this->initialized || $this->runtimeInitialized;
}
public function getLastModified(): int
{
if (0 !== $this->lastModified) {
return $this->lastModified;
}
foreach ($this->extensions as $extension) {
$r = new \ReflectionObject($extension);
if (is_file($r->getFileName()) && ($extensionTime = filemtime($r->getFileName())) > $this->lastModified) {
$this->lastModified = $extensionTime;
}
}
return $this->lastModified;
}
public function addExtension(ExtensionInterface $extension): void
{
$class = \get_class($extension);
if ($this->initialized) {
throw new \LogicException(sprintf('Unable to register extension "%s" as extensions have already been initialized.', $class));
}
if (isset($this->extensions[$class])) {
throw new \LogicException(sprintf('Unable to register extension "%s" as it is already registered.', $class));
}
$this->extensions[$class] = $extension;
}
public function addFunction(TwigFunction $function): void
{
if ($this->initialized) {
throw new \LogicException(sprintf('Unable to add function "%s" as extensions have already been initialized.', $function->getName()));
}
$this->staging->addFunction($function);
}
/**
* @return TwigFunction[]
*/
public function getFunctions(): array
{
if (!$this->initialized) {
$this->initExtensions();
}
return $this->functions;
}
public function getFunction(string $name): ?TwigFunction
{
if (!$this->initialized) {
$this->initExtensions();
}
if (isset($this->functions[$name])) {
return $this->functions[$name];
}
foreach ($this->functions as $pattern => $function) {
$pattern = str_replace('\\*', '(.*?)', preg_quote($pattern, '#'), $count);
if ($count && preg_match('#^'.$pattern.'$#', $name, $matches)) {
array_shift($matches);
$function->setArguments($matches);
return $function;
}
}
foreach ($this->functionCallbacks as $callback) {
if (false !== $function = $callback($name)) {
return $function;
}
}
return null;
}
public function registerUndefinedFunctionCallback(callable $callable): void
{
$this->functionCallbacks[] = $callable;
}
public function addFilter(TwigFilter $filter): void
{
if ($this->initialized) {
throw new \LogicException(sprintf('Unable to add filter "%s" as extensions have already been initialized.', $filter->getName()));
}
$this->staging->addFilter($filter);
}
/**
* @return TwigFilter[]
*/
public function getFilters(): array
{
if (!$this->initialized) {
$this->initExtensions();
}
return $this->filters;
}
public function getFilter(string $name): ?TwigFilter
{
if (!$this->initialized) {
$this->initExtensions();
}
if (isset($this->filters[$name])) {
return $this->filters[$name];
}
foreach ($this->filters as $pattern => $filter) {
$pattern = str_replace('\\*', '(.*?)', preg_quote($pattern, '#'), $count);
if ($count && preg_match('#^'.$pattern.'$#', $name, $matches)) {
array_shift($matches);
$filter->setArguments($matches);
return $filter;
}
}
foreach ($this->filterCallbacks as $callback) {
if (false !== $filter = $callback($name)) {
return $filter;
}
}
return null;
}
public function registerUndefinedFilterCallback(callable $callable): void
{
$this->filterCallbacks[] = $callable;
}
public function addNodeVisitor(NodeVisitorInterface $visitor): void
{
if ($this->initialized) {
throw new \LogicException('Unable to add a node visitor as extensions have already been initialized.');
}
$this->staging->addNodeVisitor($visitor);
}
/**
* @return NodeVisitorInterface[]
*/
public function getNodeVisitors(): array
{
if (!$this->initialized) {
$this->initExtensions();
}
return $this->visitors;
}
public function addTokenParser(TokenParserInterface $parser): void
{
if ($this->initialized) {
throw new \LogicException('Unable to add a token parser as extensions have already been initialized.');
}
$this->staging->addTokenParser($parser);
}
/**
* @return TokenParserInterface[]
*/
public function getTokenParsers(): array
{
if (!$this->initialized) {
$this->initExtensions();
}
return $this->parsers;
}
public function getTokenParser(string $name): ?TokenParserInterface
{
if (!$this->initialized) {
$this->initExtensions();
}
if (isset($this->parsers[$name])) {
return $this->parsers[$name];
}
foreach ($this->parserCallbacks as $callback) {
if (false !== $parser = $callback($name)) {
return $parser;
}
}
return null;
}
public function registerUndefinedTokenParserCallback(callable $callable): void
{
$this->parserCallbacks[] = $callable;
}
/**
* @return array<string, mixed>
*/
public function getGlobals(): array
{
if (null !== $this->globals) {
return $this->globals;
}
$globals = [];
foreach ($this->extensions as $extension) {
if (!$extension instanceof GlobalsInterface) {
continue;
}
$extGlobals = $extension->getGlobals();
if (!\is_array($extGlobals)) {
throw new \UnexpectedValueException(sprintf('"%s::getGlobals()" must return an array of globals.', \get_class($extension)));
}
$globals = array_merge($globals, $extGlobals);
}
if ($this->initialized) {
$this->globals = $globals;
}
return $globals;
}
public function addTest(TwigTest $test): void
{
if ($this->initialized) {
throw new \LogicException(sprintf('Unable to add test "%s" as extensions have already been initialized.', $test->getName()));
}
$this->staging->addTest($test);
}
/**
* @return TwigTest[]
*/
public function getTests(): array
{
if (!$this->initialized) {
$this->initExtensions();
}
return $this->tests;
}
public function getTest(string $name): ?TwigTest
{
if (!$this->initialized) {
$this->initExtensions();
}
if (isset($this->tests[$name])) {
return $this->tests[$name];
}
foreach ($this->tests as $pattern => $test) {
$pattern = str_replace('\\*', '(.*?)', preg_quote($pattern, '#'), $count);
if ($count) {
if (preg_match('#^'.$pattern.'$#', $name, $matches)) {
array_shift($matches);
$test->setArguments($matches);
return $test;
}
}
}
return null;
}
/**
* @return array<string, array{precedence: int, class: class-string<AbstractUnary>}>
*/
public function getUnaryOperators(): array
{
if (!$this->initialized) {
$this->initExtensions();
}
return $this->unaryOperators;
}
/**
* @return array<string, array{precedence: int, class: class-string<AbstractBinary>, associativity: ExpressionParser::OPERATOR_*}>
*/
public function getBinaryOperators(): array
{
if (!$this->initialized) {
$this->initExtensions();
}
return $this->binaryOperators;
}
private function initExtensions(): void
{
$this->parsers = [];
$this->filters = [];
$this->functions = [];
$this->tests = [];
$this->visitors = [];
$this->unaryOperators = [];
$this->binaryOperators = [];
foreach ($this->extensions as $extension) {
$this->initExtension($extension);
}
$this->initExtension($this->staging);
// Done at the end only, so that an exception during initialization does not mark the environment as initialized when catching the exception
$this->initialized = true;
}
private function initExtension(ExtensionInterface $extension): void
{
// filters
foreach ($extension->getFilters() as $filter) {
$this->filters[$filter->getName()] = $filter;
}
// functions
foreach ($extension->getFunctions() as $function) {
$this->functions[$function->getName()] = $function;
}
// tests
foreach ($extension->getTests() as $test) {
$this->tests[$test->getName()] = $test;
}
// token parsers
foreach ($extension->getTokenParsers() as $parser) {
if (!$parser instanceof TokenParserInterface) {
throw new \LogicException('getTokenParsers() must return an array of \Twig\TokenParser\TokenParserInterface.');
}
$this->parsers[$parser->getTag()] = $parser;
}
// node visitors
foreach ($extension->getNodeVisitors() as $visitor) {
$this->visitors[] = $visitor;
}
// operators
if ($operators = $extension->getOperators()) {
if (!\is_array($operators)) {
throw new \InvalidArgumentException(sprintf('"%s::getOperators()" must return an array with operators, got "%s".', \get_class($extension), \is_object($operators) ? \get_class($operators) : \gettype($operators).(\is_resource($operators) ? '' : '#'.$operators)));
}
if (2 !== \count($operators)) {
throw new \InvalidArgumentException(sprintf('"%s::getOperators()" must return an array of 2 elements, got %d.', \get_class($extension), \count($operators)));
}
$this->unaryOperators = array_merge($this->unaryOperators, $operators[0]);
$this->binaryOperators = array_merge($this->binaryOperators, $operators[1]);
}
}
}
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