Symfony Profiler

<?php
/*
* This file is part of Twig.
*
* (c) Fabien Potencier
* (c) Armin Ronacher
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Twig;
use Twig\Error\SyntaxError;
use Twig\ExpressionParser\ExpressionParserInterface;
use Twig\ExpressionParser\ExpressionParsers;
use Twig\ExpressionParser\ExpressionParserType;
use Twig\ExpressionParser\InfixExpressionParserInterface;
use Twig\ExpressionParser\Prefix\LiteralExpressionParser;
use Twig\ExpressionParser\PrefixExpressionParserInterface;
use Twig\Node\BlockNode;
use Twig\Node\BlockReferenceNode;
use Twig\Node\BodyNode;
use Twig\Node\EmptyNode;
use Twig\Node\Expression\AbstractExpression;
use Twig\Node\Expression\Variable\AssignTemplateVariable;
use Twig\Node\Expression\Variable\TemplateVariable;
use Twig\Node\MacroNode;
use Twig\Node\ModuleNode;
use Twig\Node\Node;
use Twig\Node\Nodes;
use Twig\Node\PrintNode;
use Twig\Node\TextNode;
use Twig\TokenParser\TokenParserInterface;
use Twig\Util\ReflectionCallable;
/**
* @author Fabien Potencier <fabien@symfony.com>
*/
class Parser
{
private $stack = [];
private ?\WeakMap $expressionRefs = null;
private $stream;
private $parent;
private $visitors;
private $expressionParser;
private $blocks;
private $blockStack;
private $macros;
private $importedSymbols;
private $traits;
private $embeddedTemplates = [];
private int $lastEmbedIndex = 0;
private $varNameSalt = 0;
private $ignoreUnknownTwigCallables = false;
private ExpressionParsers $parsers;
public function __construct(
private Environment $env,
) {
$this->parsers = $env->getExpressionParsers();
}
public function getEnvironment(): Environment
{
return $this->env;
}
public function getVarName(): string
{
trigger_deprecation('twig/twig', '3.15', 'The "%s()" method is deprecated.', __METHOD__);
return \sprintf('__internal_parse_%d', $this->varNameSalt++);
}
/**
* @throws SyntaxError
*/
public function parse(TokenStream $stream, $test = null, bool $dropNeedle = false): ModuleNode
{
// reset on root parse() calls only, so the counter spans nested/reentrant parses
if (!$this->stack) {
$this->lastEmbedIndex = 0;
}
$vars = get_object_vars($this);
unset($vars['stack'], $vars['env'], $vars['handlers'], $vars['visitors'], $vars['expressionParser'], $vars['reservedMacroNames'], $vars['lastEmbedIndex'], $vars['varNameSalt']);
$this->stack[] = $vars;
// node visitors
if (null === $this->visitors) {
$this->visitors = $this->env->getNodeVisitors();
}
$this->stream = $stream;
$this->parent = null;
$this->blocks = [];
$this->macros = [];
$this->traits = [];
$this->blockStack = [];
$this->importedSymbols = [[]];
$this->embeddedTemplates = [];
$this->expressionRefs = new \WeakMap();
try {
$body = $this->subparse($test, $dropNeedle);
} catch (SyntaxError $e) {
if (!$e->getSourceContext()) {
$e->setSourceContext($this->stream->getSourceContext());
}
if (!$e->getTemplateLine()) {
$e->setTemplateLine($this->getCurrentToken()->getLine());
}
throw $e;
} finally {
$this->expressionRefs = null;
}
if ($this->parent) {
$body = $this->cleanupBodyForChildTemplates($body);
}
$node = new ModuleNode(
new BodyNode([$body]),
$this->parent,
$this->blocks ? new Nodes($this->blocks) : new EmptyNode(),
$this->macros ? new Nodes($this->macros) : new EmptyNode(),
$this->traits ? new Nodes($this->traits) : new EmptyNode(),
$this->embeddedTemplates ? new Nodes($this->embeddedTemplates) : new EmptyNode(),
$stream->getSourceContext(),
);
$traverser = new NodeTraverser($this->env, $this->visitors);
/**
* @var ModuleNode $node
*/
$node = $traverser->traverse($node);
// restore previous stack so previous parse() call can resume working
foreach (array_pop($this->stack) as $key => $val) {
$this->$key = $val;
}
return $node;
}
public function shouldIgnoreUnknownTwigCallables(): bool
{
return $this->ignoreUnknownTwigCallables;
}
public function subparseIgnoreUnknownTwigCallables($test, bool $dropNeedle = false): void
{
$previous = $this->ignoreUnknownTwigCallables;
$this->ignoreUnknownTwigCallables = true;
try {
$this->subparse($test, $dropNeedle);
} finally {
$this->ignoreUnknownTwigCallables = $previous;
}
}
/**
* @throws SyntaxError
*/
public function subparse($test, bool $dropNeedle = false): Node
{
$lineno = $this->getCurrentToken()->getLine();
$rv = [];
while (!$this->stream->isEOF()) {
switch (true) {
case $this->stream->getCurrent()->test(Token::TEXT_TYPE):
$token = $this->stream->next();
$rv[] = new TextNode($token->getValue(), $token->getLine());
break;
case $this->stream->getCurrent()->test(Token::VAR_START_TYPE):
$token = $this->stream->next();
$expr = $this->parseExpression();
$this->stream->expect(Token::VAR_END_TYPE);
$rv[] = new PrintNode($expr, $token->getLine());
break;
case $this->stream->getCurrent()->test(Token::BLOCK_START_TYPE):
$this->stream->next();
$token = $this->getCurrentToken();
if (!$token->test(Token::NAME_TYPE)) {
throw new SyntaxError('A block must start with a tag name.', $token->getLine(), $this->stream->getSourceContext());
}
if (null !== $test && $test($token)) {
if ($dropNeedle) {
$this->stream->next();
}
if (1 === \count($rv)) {
return $rv[0];
}
return new Nodes($rv, $lineno);
}
if (!$subparser = $this->env->getTokenParser($token->getValue())) {
if (null !== $test) {
$e = new SyntaxError(\sprintf('Unexpected "%s" tag', $token->getValue()), $token->getLine(), $this->stream->getSourceContext());
$callable = (new ReflectionCallable(new TwigTest('decision', $test)))->getCallable();
if (\is_array($callable) && $callable[0] instanceof TokenParserInterface) {
$e->appendMessage(\sprintf(' (expecting closing tag for the "%s" tag defined near line %s).', $callable[0]->getTag(), $lineno));
}
} else {
$e = new SyntaxError(\sprintf('Unknown "%s" tag.', $token->getValue()), $token->getLine(), $this->stream->getSourceContext());
$e->addSuggestions($token->getValue(), array_keys($this->env->getTokenParsers()));
}
throw $e;
}
$this->stream->next();
$subparser->setParser($this);
$node = $subparser->parse($token);
if (!$node) {
trigger_deprecation('twig/twig', '3.12', 'Returning "null" from "%s" is deprecated and forbidden by "TokenParserInterface".', $subparser::class);
} else {
$node->setNodeTag($subparser->getTag());
$rv[] = $node;
}
break;
default:
throw new SyntaxError('The lexer or the parser ended up in an unsupported state.', $this->getCurrentToken()->getLine(), $this->stream->getSourceContext());
}
}
if (1 === \count($rv)) {
return $rv[0];
}
return new Nodes($rv, $lineno);
}
public function getBlockStack(): array
{
trigger_deprecation('twig/twig', '3.12', 'Method "%s()" is deprecated.', __METHOD__);
return $this->blockStack;
}
/**
* @return string|null
*/
public function peekBlockStack()
{
return $this->blockStack[\count($this->blockStack) - 1] ?? null;
}
public function popBlockStack(): void
{
array_pop($this->blockStack);
}
public function pushBlockStack($name): void
{
$this->blockStack[] = $name;
}
public function hasBlock(string $name): bool
{
trigger_deprecation('twig/twig', '3.12', 'Method "%s()" is deprecated.', __METHOD__);
return isset($this->blocks[$name]);
}
public function getBlock(string $name): Node
{
trigger_deprecation('twig/twig', '3.12', 'Method "%s()" is deprecated.', __METHOD__);
return $this->blocks[$name];
}
public function setBlock(string $name, BlockNode $value): void
{
if (isset($this->blocks[$name])) {
throw new SyntaxError(\sprintf("The block '%s' has already been defined line %d.", $name, $this->blocks[$name]->getTemplateLine()), $this->getCurrentToken()->getLine(), $this->blocks[$name]->getSourceContext());
}
$this->blocks[$name] = new BodyNode([$value], [], $value->getTemplateLine());
}
public function hasMacro(string $name): bool
{
trigger_deprecation('twig/twig', '3.12', 'Method "%s()" is deprecated.', __METHOD__);
return isset($this->macros[$name]);
}
public function setMacro(string $name, MacroNode $node): void
{
$this->macros[$name] = $node;
}
public function addTrait($trait): void
{
$this->traits[] = $trait;
}
public function hasTraits(): bool
{
trigger_deprecation('twig/twig', '3.12', 'Method "%s()" is deprecated.', __METHOD__);
return \count($this->traits) > 0;
}
/**
* @return void
*/
public function embedTemplate(ModuleNode $template)
{
$template->setIndex(++$this->lastEmbedIndex);
$this->embeddedTemplates[] = $template;
}
public function addImportedSymbol(string $type, string $alias, ?string $name = null, AbstractExpression|AssignTemplateVariable|null $internalRef = null): void
{
if ($internalRef && !$internalRef instanceof AssignTemplateVariable) {
trigger_deprecation('twig/twig', '3.15', 'Not passing a "%s" instance as an internal reference is deprecated ("%s" given).', __METHOD__, AssignTemplateVariable::class, $internalRef::class);
$internalRef = new AssignTemplateVariable(new TemplateVariable($internalRef->getAttribute('name'), $internalRef->getTemplateLine()), $internalRef->getAttribute('global'));
}
$this->importedSymbols[0][$type][$alias] = ['name' => $name, 'node' => $internalRef];
}
/**
* @return array{name: string, node: AssignTemplateVariable|null}|null
*/
public function getImportedSymbol(string $type, string $alias)
{
// if the symbol does not exist in the current scope (0), try in the main/global scope (last index)
return $this->importedSymbols[0][$type][$alias] ?? ($this->importedSymbols[\count($this->importedSymbols) - 1][$type][$alias] ?? null);
}
public function isMainScope(): bool
{
return 1 === \count($this->importedSymbols);
}
public function pushLocalScope(): void
{
array_unshift($this->importedSymbols, []);
}
public function popLocalScope(): void
{
array_shift($this->importedSymbols);
}
/**
* @deprecated since Twig 3.21
*/
public function getExpressionParser(): ExpressionParser
{
trigger_deprecation('twig/twig', '3.21', 'Method "%s()" is deprecated, use "parseExpression()" instead.', __METHOD__);
if (null === $this->expressionParser) {
$this->expressionParser = new ExpressionParser($this, $this->env);
}
return $this->expressionParser;
}
public function parseExpression(int $precedence = 0): AbstractExpression
{
$token = $this->getCurrentToken();
if ($token->test(Token::OPERATOR_TYPE) && $ep = $this->parsers->getByName(PrefixExpressionParserInterface::class, $token->getValue())) {
$this->getStream()->next();
$expr = $ep->parse($this, $token);
$this->checkPrecedenceDeprecations($ep, $expr);
} else {
$expr = $this->parsers->getByClass(LiteralExpressionParser::class)->parse($this, $token);
}
$token = $this->getCurrentToken();
while ($token->test(Token::OPERATOR_TYPE) && ($ep = $this->parsers->getByName(InfixExpressionParserInterface::class, $token->getValue())) && $ep->getPrecedence() >= $precedence) {
$this->getStream()->next();
$expr = $ep->parse($this, $expr, $token);
$this->checkPrecedenceDeprecations($ep, $expr);
$token = $this->getCurrentToken();
}
return $expr;
}
public function getParent(): ?Node
{
trigger_deprecation('twig/twig', '3.12', 'Method "%s()" is deprecated.', __METHOD__);
return $this->parent;
}
/**
* @return bool
*/
public function hasInheritance()
{
return $this->parent || 0 < \count($this->traits);
}
public function setParent(?Node $parent, bool $throwOnMultiple = true): void
{
if (null === $parent) {
trigger_deprecation('twig/twig', '3.12', 'Passing "null" to "%s()" is deprecated.', __METHOD__);
}
if (null !== $parent && !$parent instanceof AbstractExpression) {
trigger_deprecation('twig/twig', '3.24', 'Passing a "%s" instance to "%s()" is deprecated, pass an "AbstractExpression" instance instead.', $parent::class, __METHOD__);
}
if (null !== $this->parent) {
if (!$throwOnMultiple) {
return;
}
throw new SyntaxError('Multiple extends tags are forbidden.', $parent->getTemplateLine(), $parent->getSourceContext());
}
$this->parent = $parent;
}
public function getStream(): TokenStream
{
return $this->stream;
}
public function getCurrentToken(): Token
{
return $this->stream->getCurrent();
}
public function getFunction(string $name, int $line): TwigFunction
{
try {
$function = $this->env->getFunction($name);
} catch (SyntaxError $e) {
if (!$this->shouldIgnoreUnknownTwigCallables()) {
throw $e;
}
$function = null;
}
if (!$function) {
if ($this->shouldIgnoreUnknownTwigCallables()) {
return new TwigFunction($name, static fn () => '');
}
$e = new SyntaxError(\sprintf('Unknown "%s" function.', $name), $line, $this->stream->getSourceContext());
$e->addSuggestions($name, array_keys($this->env->getFunctions()));
throw $e;
}
if ($function->isDeprecated()) {
$src = $this->stream->getSourceContext();
$function->triggerDeprecation($src->getPath() ?: $src->getName(), $line);
}
return $function;
}
public function getFilter(string $name, int $line): TwigFilter
{
try {
$filter = $this->env->getFilter($name);
} catch (SyntaxError $e) {
if (!$this->shouldIgnoreUnknownTwigCallables()) {
throw $e;
}
$filter = null;
}
if (!$filter) {
if ($this->shouldIgnoreUnknownTwigCallables()) {
return new TwigFilter($name, static fn () => '');
}
$e = new SyntaxError(\sprintf('Unknown "%s" filter.', $name), $line, $this->stream->getSourceContext());
$e->addSuggestions($name, array_keys($this->env->getFilters()));
throw $e;
}
if ($filter->isDeprecated()) {
$src = $this->stream->getSourceContext();
$filter->triggerDeprecation($src->getPath() ?: $src->getName(), $line);
}
return $filter;
}
public function getTest(int $line): TwigTest
{
$name = $this->stream->expect(Token::NAME_TYPE)->getValue();
if ($this->stream->test(Token::NAME_TYPE)) {
// try 2-words tests
$name = $name.' '.$this->getCurrentToken()->getValue();
try {
$test = $this->env->getTest($name);
} catch (SyntaxError $e) {
if (!$this->shouldIgnoreUnknownTwigCallables()) {
throw $e;
}
$test = null;
}
$this->stream->next();
} else {
try {
$test = $this->env->getTest($name);
} catch (SyntaxError $e) {
if (!$this->shouldIgnoreUnknownTwigCallables()) {
throw $e;
}
$test = null;
}
}
if (!$test) {
if ($this->shouldIgnoreUnknownTwigCallables()) {
return new TwigTest($name, static fn () => '');
}
$e = new SyntaxError(\sprintf('Unknown "%s" test.', $name), $line, $this->stream->getSourceContext());
$e->addSuggestions($name, array_keys($this->env->getTests()));
throw $e;
}
if ($test->isDeprecated()) {
$src = $this->stream->getSourceContext();
$test->triggerDeprecation($src->getPath() ?: $src->getName(), $this->stream->getCurrent()->getLine());
}
return $test;
}
private function cleanupBodyForChildTemplates(Node $body): Node
{
if ($body instanceof BlockReferenceNode || ($body instanceof TextNode && $body->isBlank())) {
return new EmptyNode();
}
foreach ($body as $k => $node) {
if ($node instanceof BlockReferenceNode) {
// as it has a parent, the block reference won't be used
$body->removeNode($k);
} elseif ($node instanceof TextNode && $node->isBlank()) {
// remove nodes considered as "empty"
$body->removeNode($k);
}
}
return $body;
}
private function checkPrecedenceDeprecations(ExpressionParserInterface $expressionParser, AbstractExpression $expr)
{
$this->expressionRefs[$expr] = $expressionParser;
$precedenceChanges = $this->parsers->getPrecedenceChanges();
// Check that the all nodes that are between the 2 precedences have explicit parentheses
if (!isset($precedenceChanges[$expressionParser])) {
return;
}
if ($expr->hasExplicitParentheses()) {
return;
}
if ($expressionParser instanceof PrefixExpressionParserInterface) {
/** @var AbstractExpression $node */
$node = $expr->getNode('node');
foreach ($precedenceChanges as $ep => $changes) {
if (!\in_array($expressionParser, $changes, true)) {
continue;
}
if (isset($this->expressionRefs[$node]) && $ep === $this->expressionRefs[$node]) {
$change = $expressionParser->getPrecedenceChange();
trigger_deprecation($change->getPackage(), $change->getVersion(), \sprintf('As the "%s" %s operator will change its precedence in the next major version, add explicit parentheses to avoid behavior change in "%s" at line %d.', $expressionParser->getName(), ExpressionParserType::getType($expressionParser)->value, $this->getStream()->getSourceContext()->getName(), $node->getTemplateLine()));
}
}
}
foreach ($precedenceChanges[$expressionParser] as $ep) {
foreach ($expr as $node) {
/** @var AbstractExpression $node */
if (isset($this->expressionRefs[$node]) && $ep === $this->expressionRefs[$node] && !$node->hasExplicitParentheses()) {
$change = $ep->getPrecedenceChange();
trigger_deprecation($change->getPackage(), $change->getVersion(), \sprintf('As the "%s" %s operator will change its precedence in the next major version, add explicit parentheses to avoid behavior change in "%s" at line %d.', $ep->getName(), ExpressionParserType::getType($ep)->value, $this->getStream()->getSourceContext()->getName(), $node->getTemplateLine()));
}
}
}
}
}

vendor/twig/twig/src/Parser.php line 108