mirror of
https://github.com/twigphp/Twig.git
synced 2026-08-23 16:01:25 +00:00
itsalmostchristmas
640 lines
22 KiB
PHP
640 lines
22 KiB
PHP
<?php
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/*
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* This file is part of Twig.
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*
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* (c) Fabien Potencier
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* (c) Armin Ronacher
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Twig;
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use Twig\Error\SyntaxError;
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use Twig\ExpressionParser\ExpressionParserInterface;
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use Twig\ExpressionParser\ExpressionParsers;
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use Twig\ExpressionParser\ExpressionParserType;
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use Twig\ExpressionParser\InfixExpressionParserInterface;
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use Twig\ExpressionParser\Prefix\LiteralExpressionParser;
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use Twig\ExpressionParser\PrefixExpressionParserInterface;
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use Twig\Node\BlockNode;
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use Twig\Node\BlockReferenceNode;
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use Twig\Node\BodyNode;
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use Twig\Node\EmptyNode;
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use Twig\Node\Expression\AbstractExpression;
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use Twig\Node\Expression\Variable\AssignTemplateVariable;
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use Twig\Node\Expression\Variable\TemplateVariable;
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use Twig\Node\MacroNode;
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use Twig\Node\ModuleNode;
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use Twig\Node\Node;
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use Twig\Node\NodeCaptureInterface;
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use Twig\Node\NodeOutputInterface;
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use Twig\Node\Nodes;
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use Twig\Node\PrintNode;
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use Twig\Node\TextNode;
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use Twig\TokenParser\TokenParserInterface;
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use Twig\Util\ReflectionCallable;
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/**
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Parser
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{
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private $stack = [];
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private ?\WeakMap $expressionRefs = null;
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private $stream;
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private $parent;
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private $visitors;
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private $expressionParser;
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private $blocks;
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private $blockStack;
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private $macros;
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private $importedSymbols;
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private $traits;
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private $embeddedTemplates = [];
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private int $lastEmbedIndex = 0;
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private $varNameSalt = 0;
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private $ignoreUnknownTwigCallables = false;
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private ExpressionParsers $parsers;
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public function __construct(
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private Environment $env,
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) {
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$this->parsers = $env->getExpressionParsers();
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}
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public function getEnvironment(): Environment
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{
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return $this->env;
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}
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public function getVarName(): string
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{
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trigger_deprecation('twig/twig', '3.15', 'The "%s()" method is deprecated.', __METHOD__);
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return \sprintf('__internal_parse_%d', $this->varNameSalt++);
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}
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/**
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* @throws SyntaxError
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*/
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public function parse(TokenStream $stream, $test = null, bool $dropNeedle = false): ModuleNode
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{
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// reset on root parse() calls only, so the counter spans nested/reentrant parses
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if (!$this->stack) {
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$this->lastEmbedIndex = 0;
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}
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$vars = get_object_vars($this);
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unset($vars['stack'], $vars['env'], $vars['handlers'], $vars['visitors'], $vars['expressionParser'], $vars['reservedMacroNames'], $vars['lastEmbedIndex'], $vars['varNameSalt']);
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$this->stack[] = $vars;
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// node visitors
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if (null === $this->visitors) {
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$this->visitors = $this->env->getNodeVisitors();
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}
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$this->stream = $stream;
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$this->parent = null;
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$this->blocks = [];
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$this->macros = [];
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$this->traits = [];
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$this->blockStack = [];
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$this->importedSymbols = [[]];
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$this->embeddedTemplates = [];
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$this->expressionRefs = new \WeakMap();
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try {
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$body = $this->subparse($test, $dropNeedle);
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if (null !== $this->parent && null === $body = $this->filterBodyNodes($body)) {
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$body = new EmptyNode();
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}
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} catch (SyntaxError $e) {
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if (!$e->getSourceContext()) {
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$e->setSourceContext($this->stream->getSourceContext());
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}
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if (!$e->getTemplateLine()) {
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$e->setTemplateLine($this->getCurrentToken()->getLine());
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}
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throw $e;
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} finally {
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$this->expressionRefs = null;
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}
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$node = new ModuleNode(
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new BodyNode([$body]),
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$this->parent,
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$this->blocks ? new Nodes($this->blocks) : new EmptyNode(),
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$this->macros ? new Nodes($this->macros) : new EmptyNode(),
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$this->traits ? new Nodes($this->traits) : new EmptyNode(),
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$this->embeddedTemplates ? new Nodes($this->embeddedTemplates) : new EmptyNode(),
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$stream->getSourceContext(),
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);
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$traverser = new NodeTraverser($this->env, $this->visitors);
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/**
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* @var ModuleNode $node
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*/
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$node = $traverser->traverse($node);
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// restore previous stack so previous parse() call can resume working
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foreach (array_pop($this->stack) as $key => $val) {
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$this->$key = $val;
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}
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return $node;
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}
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public function shouldIgnoreUnknownTwigCallables(): bool
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{
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return $this->ignoreUnknownTwigCallables;
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}
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public function subparseIgnoreUnknownTwigCallables($test, bool $dropNeedle = false): void
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{
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$previous = $this->ignoreUnknownTwigCallables;
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$this->ignoreUnknownTwigCallables = true;
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try {
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$this->subparse($test, $dropNeedle);
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} finally {
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$this->ignoreUnknownTwigCallables = $previous;
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}
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}
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/**
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* @throws SyntaxError
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*/
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public function subparse($test, bool $dropNeedle = false): Node
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{
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$lineno = $this->getCurrentToken()->getLine();
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$rv = [];
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while (!$this->stream->isEOF()) {
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switch (true) {
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case $this->stream->getCurrent()->test(Token::TEXT_TYPE):
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$token = $this->stream->next();
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$rv[] = new TextNode($token->getValue(), $token->getLine());
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break;
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case $this->stream->getCurrent()->test(Token::VAR_START_TYPE):
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$token = $this->stream->next();
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$expr = $this->parseExpression();
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$this->stream->expect(Token::VAR_END_TYPE);
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$rv[] = new PrintNode($expr, $token->getLine());
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break;
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case $this->stream->getCurrent()->test(Token::BLOCK_START_TYPE):
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$this->stream->next();
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$token = $this->getCurrentToken();
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if (!$token->test(Token::NAME_TYPE)) {
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throw new SyntaxError('A block must start with a tag name.', $token->getLine(), $this->stream->getSourceContext());
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}
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if (null !== $test && $test($token)) {
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if ($dropNeedle) {
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$this->stream->next();
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}
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if (1 === \count($rv)) {
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return $rv[0];
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}
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return new Nodes($rv, $lineno);
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}
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if (!$subparser = $this->env->getTokenParser($token->getValue())) {
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if (null !== $test) {
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$e = new SyntaxError(\sprintf('Unexpected "%s" tag', $token->getValue()), $token->getLine(), $this->stream->getSourceContext());
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$callable = (new ReflectionCallable(new TwigTest('decision', $test)))->getCallable();
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if (\is_array($callable) && $callable[0] instanceof TokenParserInterface) {
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$e->appendMessage(\sprintf(' (expecting closing tag for the "%s" tag defined near line %s).', $callable[0]->getTag(), $lineno));
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}
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} else {
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$e = new SyntaxError(\sprintf('Unknown "%s" tag.', $token->getValue()), $token->getLine(), $this->stream->getSourceContext());
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$e->addSuggestions($token->getValue(), array_keys($this->env->getTokenParsers()));
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}
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throw $e;
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}
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$this->stream->next();
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$subparser->setParser($this);
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$node = $subparser->parse($token);
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if (!$node) {
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trigger_deprecation('twig/twig', '3.12', 'Returning "null" from "%s" is deprecated and forbidden by "TokenParserInterface".', $subparser::class);
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} else {
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$node->setNodeTag($subparser->getTag());
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$rv[] = $node;
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}
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break;
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default:
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throw new SyntaxError('The lexer or the parser ended up in an unsupported state.', $this->getCurrentToken()->getLine(), $this->stream->getSourceContext());
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}
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}
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if (1 === \count($rv)) {
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return $rv[0];
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}
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return new Nodes($rv, $lineno);
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}
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public function getBlockStack(): array
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{
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trigger_deprecation('twig/twig', '3.12', 'Method "%s()" is deprecated.', __METHOD__);
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return $this->blockStack;
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}
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/**
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* @return string|null
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*/
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public function peekBlockStack()
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{
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return $this->blockStack[\count($this->blockStack) - 1] ?? null;
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}
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public function popBlockStack(): void
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{
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array_pop($this->blockStack);
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}
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public function pushBlockStack($name): void
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{
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$this->blockStack[] = $name;
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}
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public function hasBlock(string $name): bool
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{
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trigger_deprecation('twig/twig', '3.12', 'Method "%s()" is deprecated.', __METHOD__);
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return isset($this->blocks[$name]);
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}
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public function getBlock(string $name): Node
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{
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trigger_deprecation('twig/twig', '3.12', 'Method "%s()" is deprecated.', __METHOD__);
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return $this->blocks[$name];
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}
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public function setBlock(string $name, BlockNode $value): void
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{
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if (isset($this->blocks[$name])) {
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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());
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}
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$this->blocks[$name] = new BodyNode([$value], [], $value->getTemplateLine());
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}
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public function hasMacro(string $name): bool
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{
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trigger_deprecation('twig/twig', '3.12', 'Method "%s()" is deprecated.', __METHOD__);
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return isset($this->macros[$name]);
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}
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public function setMacro(string $name, MacroNode $node): void
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{
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$this->macros[$name] = $node;
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}
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public function addTrait($trait): void
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{
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$this->traits[] = $trait;
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}
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public function hasTraits(): bool
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{
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trigger_deprecation('twig/twig', '3.12', 'Method "%s()" is deprecated.', __METHOD__);
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return \count($this->traits) > 0;
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}
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/**
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* @return void
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*/
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public function embedTemplate(ModuleNode $template)
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{
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$template->setIndex(++$this->lastEmbedIndex);
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$this->embeddedTemplates[] = $template;
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}
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public function addImportedSymbol(string $type, string $alias, ?string $name = null, AbstractExpression|AssignTemplateVariable|null $internalRef = null): void
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{
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if ($internalRef && !$internalRef instanceof AssignTemplateVariable) {
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trigger_deprecation('twig/twig', '3.15', 'Not passing a "%s" instance as an internal reference is deprecated ("%s" given).', __METHOD__, AssignTemplateVariable::class, $internalRef::class);
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$internalRef = new AssignTemplateVariable(new TemplateVariable($internalRef->getAttribute('name'), $internalRef->getTemplateLine()), $internalRef->getAttribute('global'));
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}
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$this->importedSymbols[0][$type][$alias] = ['name' => $name, 'node' => $internalRef];
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}
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/**
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* @return array{name: string, node: AssignTemplateVariable|null}|null
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*/
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public function getImportedSymbol(string $type, string $alias)
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{
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// if the symbol does not exist in the current scope (0), try in the main/global scope (last index)
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return $this->importedSymbols[0][$type][$alias] ?? ($this->importedSymbols[\count($this->importedSymbols) - 1][$type][$alias] ?? null);
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}
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public function isMainScope(): bool
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{
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return 1 === \count($this->importedSymbols);
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}
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public function pushLocalScope(): void
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{
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array_unshift($this->importedSymbols, []);
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}
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public function popLocalScope(): void
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{
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array_shift($this->importedSymbols);
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}
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/**
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* @deprecated since Twig 3.21
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*/
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public function getExpressionParser(): ExpressionParser
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{
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trigger_deprecation('twig/twig', '3.21', 'Method "%s()" is deprecated, use "parseExpression()" instead.', __METHOD__);
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if (null === $this->expressionParser) {
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$this->expressionParser = new ExpressionParser($this, $this->env);
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}
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return $this->expressionParser;
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}
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public function parseExpression(int $precedence = 0): AbstractExpression
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{
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$token = $this->getCurrentToken();
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if ($token->test(Token::OPERATOR_TYPE) && $ep = $this->parsers->getByName(PrefixExpressionParserInterface::class, $token->getValue())) {
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$this->getStream()->next();
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$expr = $ep->parse($this, $token);
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$this->checkPrecedenceDeprecations($ep, $expr);
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} else {
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$expr = $this->parsers->getByClass(LiteralExpressionParser::class)->parse($this, $token);
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}
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$token = $this->getCurrentToken();
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while ($token->test(Token::OPERATOR_TYPE) && ($ep = $this->parsers->getByName(InfixExpressionParserInterface::class, $token->getValue())) && $ep->getPrecedence() >= $precedence) {
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$this->getStream()->next();
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$expr = $ep->parse($this, $expr, $token);
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$this->checkPrecedenceDeprecations($ep, $expr);
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$token = $this->getCurrentToken();
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}
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return $expr;
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}
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public function getParent(): ?Node
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{
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trigger_deprecation('twig/twig', '3.12', 'Method "%s()" is deprecated.', __METHOD__);
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return $this->parent;
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}
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/**
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* @return bool
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*/
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public function hasInheritance()
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{
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return $this->parent || 0 < \count($this->traits);
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}
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public function setParent(?Node $parent): void
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{
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if (null === $parent) {
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trigger_deprecation('twig/twig', '3.12', 'Passing "null" to "%s()" is deprecated.', __METHOD__);
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}
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if (null !== $parent && !$parent instanceof AbstractExpression) {
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trigger_deprecation('twig/twig', '3.24', 'Passing a "%s" instance to "%s()" is deprecated, pass an "AbstractExpression" instance instead.', $parent::class, __METHOD__);
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}
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if (null !== $this->parent) {
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throw new SyntaxError('Multiple extends tags are forbidden.', $parent->getTemplateLine(), $parent->getSourceContext());
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}
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$this->parent = $parent;
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}
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public function getStream(): TokenStream
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{
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return $this->stream;
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}
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public function getCurrentToken(): Token
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{
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return $this->stream->getCurrent();
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}
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public function getFunction(string $name, int $line): TwigFunction
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{
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try {
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$function = $this->env->getFunction($name);
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} catch (SyntaxError $e) {
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if (!$this->shouldIgnoreUnknownTwigCallables()) {
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throw $e;
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}
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$function = null;
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}
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if (!$function) {
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if ($this->shouldIgnoreUnknownTwigCallables()) {
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return new TwigFunction($name, static fn () => '');
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}
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$e = new SyntaxError(\sprintf('Unknown "%s" function.', $name), $line, $this->stream->getSourceContext());
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$e->addSuggestions($name, array_keys($this->env->getFunctions()));
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throw $e;
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}
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|
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if ($function->isDeprecated()) {
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$src = $this->stream->getSourceContext();
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$function->triggerDeprecation($src->getPath() ?: $src->getName(), $line);
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}
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return $function;
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}
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public function getFilter(string $name, int $line): TwigFilter
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{
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try {
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$filter = $this->env->getFilter($name);
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} catch (SyntaxError $e) {
|
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if (!$this->shouldIgnoreUnknownTwigCallables()) {
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throw $e;
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}
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$filter = null;
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}
|
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if (!$filter) {
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if ($this->shouldIgnoreUnknownTwigCallables()) {
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return new TwigFilter($name, static fn () => '');
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}
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$e = new SyntaxError(\sprintf('Unknown "%s" filter.', $name), $line, $this->stream->getSourceContext());
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$e->addSuggestions($name, array_keys($this->env->getFilters()));
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throw $e;
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}
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|
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if ($filter->isDeprecated()) {
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$src = $this->stream->getSourceContext();
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$filter->triggerDeprecation($src->getPath() ?: $src->getName(), $line);
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}
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return $filter;
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}
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public function getTest(int $line): TwigTest
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{
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$name = $this->stream->expect(Token::NAME_TYPE)->getValue();
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|
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if ($this->stream->test(Token::NAME_TYPE)) {
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// try 2-words tests
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$name = $name.' '.$this->getCurrentToken()->getValue();
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try {
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$test = $this->env->getTest($name);
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} catch (SyntaxError $e) {
|
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if (!$this->shouldIgnoreUnknownTwigCallables()) {
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throw $e;
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}
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$test = null;
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}
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$this->stream->next();
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} else {
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try {
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$test = $this->env->getTest($name);
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|
} catch (SyntaxError $e) {
|
|
if (!$this->shouldIgnoreUnknownTwigCallables()) {
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|
throw $e;
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}
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$test = null;
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}
|
|
}
|
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|
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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 filterBodyNodes(Node $node, bool $nested = false): ?Node
|
|
{
|
|
// check that the body does not contain non-empty output nodes
|
|
if (
|
|
($node instanceof TextNode && !ctype_space($node->getAttribute('data')))
|
|
|| (!$node instanceof TextNode && !$node instanceof BlockReferenceNode && $node instanceof NodeOutputInterface)
|
|
) {
|
|
if (str_contains((string) $node, \chr(0xEF).\chr(0xBB).\chr(0xBF))) {
|
|
$t = substr($node->getAttribute('data'), 3);
|
|
if ('' === $t || ctype_space($t)) {
|
|
// bypass empty nodes starting with a BOM
|
|
return null;
|
|
}
|
|
}
|
|
|
|
throw new SyntaxError('A template that extends another one cannot include content outside Twig blocks. Did you forget to put the content inside a {% block %} tag?', $node->getTemplateLine(), $this->stream->getSourceContext());
|
|
}
|
|
|
|
// bypass nodes that "capture" the output
|
|
if ($node instanceof NodeCaptureInterface) {
|
|
// a "block" tag in such a node will serve as a block definition AND be displayed in place as well
|
|
return $node;
|
|
}
|
|
|
|
// "block" tags that are not captured (see above) are only used for defining
|
|
// the content of the block. In such a case, nesting it does not work as
|
|
// expected as the definition is not part of the default template code flow.
|
|
if ($nested && $node instanceof BlockReferenceNode) {
|
|
throw new SyntaxError('A block definition cannot be nested under non-capturing nodes.', $node->getTemplateLine(), $this->stream->getSourceContext());
|
|
}
|
|
|
|
if ($node instanceof NodeOutputInterface) {
|
|
return null;
|
|
}
|
|
|
|
// here, $nested means "being at the root level of a child template"
|
|
// we need to discard the wrapping "Node" for the "body" node
|
|
// Node::class !== \get_class($node) should be removed in Twig 4.0
|
|
$nested = $nested || (Node::class !== $node::class && !$node instanceof Nodes);
|
|
foreach ($node as $k => $n) {
|
|
if (null !== $n && null === $this->filterBodyNodes($n, $nested)) {
|
|
$node->removeNode($k);
|
|
}
|
|
}
|
|
|
|
return $node;
|
|
}
|
|
|
|
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()));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|