mirror of
https://github.com/nikic/PHP-Parser.git
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1151 lines
46 KiB
PHP
1151 lines
46 KiB
PHP
<?php declare(strict_types=1);
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namespace PhpParser;
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/*
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* This parser is based on a skeleton written by Moriyoshi Koizumi, which in
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* turn is based on work by Masato Bito.
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*/
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use PhpParser\Node\Expr;
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use PhpParser\Node\Expr\Array_;
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use PhpParser\Node\Expr\Cast\Double;
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use PhpParser\Node\Identifier;
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use PhpParser\Node\InterpolatedStringPart;
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use PhpParser\Node\Name;
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use PhpParser\Node\Param;
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use PhpParser\Node\Scalar\InterpolatedString;
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use PhpParser\Node\Scalar\Int_;
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use PhpParser\Node\Scalar\String_;
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use PhpParser\Node\Stmt;
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use PhpParser\Node\Stmt\Class_;
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use PhpParser\Node\Stmt\ClassConst;
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use PhpParser\Node\Stmt\ClassMethod;
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use PhpParser\Node\Stmt\Else_;
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use PhpParser\Node\Stmt\ElseIf_;
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use PhpParser\Node\Stmt\Enum_;
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use PhpParser\Node\Stmt\Interface_;
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use PhpParser\Node\Stmt\Namespace_;
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use PhpParser\Node\Stmt\Nop;
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use PhpParser\Node\Stmt\Property;
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use PhpParser\Node\Stmt\TryCatch;
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use PhpParser\Node\UseItem;
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abstract class ParserAbstract implements Parser {
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private const SYMBOL_NONE = -1;
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/** @var Lexer Lexer that is used when parsing */
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protected $lexer;
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/** @var PhpVersion PHP version to target on a best-effort basis */
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protected $phpVersion;
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/*
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* The following members will be filled with generated parsing data:
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*/
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/** @var int Size of $tokenToSymbol map */
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protected $tokenToSymbolMapSize;
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/** @var int Size of $action table */
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protected $actionTableSize;
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/** @var int Size of $goto table */
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protected $gotoTableSize;
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/** @var int Symbol number signifying an invalid token */
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protected $invalidSymbol;
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/** @var int Symbol number of error recovery token */
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protected $errorSymbol;
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/** @var int Action number signifying default action */
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protected $defaultAction;
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/** @var int Rule number signifying that an unexpected token was encountered */
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protected $unexpectedTokenRule;
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/** @var int */
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protected $YY2TBLSTATE;
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/** @var int Number of non-leaf states */
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protected $numNonLeafStates;
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/** @var int[] Map of PHP token IDs to internal symbols */
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protected $phpTokenToSymbol;
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/** @var int[] Map of external symbols (static::T_*) to internal symbols */
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protected $tokenToSymbol;
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/** @var string[] Map of symbols to their names */
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protected $symbolToName;
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/** @var array<int, string> Names of the production rules (only necessary for debugging) */
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protected $productions;
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/** @var int[] Map of states to a displacement into the $action table. The corresponding action for this
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* state/symbol pair is $action[$actionBase[$state] + $symbol]. If $actionBase[$state] is 0, the
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* action is defaulted, i.e. $actionDefault[$state] should be used instead. */
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protected $actionBase;
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/** @var int[] Table of actions. Indexed according to $actionBase comment. */
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protected $action;
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/** @var int[] Table indexed analogously to $action. If $actionCheck[$actionBase[$state] + $symbol] != $symbol
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* then the action is defaulted, i.e. $actionDefault[$state] should be used instead. */
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protected $actionCheck;
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/** @var int[] Map of states to their default action */
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protected $actionDefault;
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/** @var callable[] Semantic action callbacks */
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protected $reduceCallbacks;
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/** @var int[] Map of non-terminals to a displacement into the $goto table. The corresponding goto state for this
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* non-terminal/state pair is $goto[$gotoBase[$nonTerminal] + $state] (unless defaulted) */
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protected $gotoBase;
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/** @var int[] Table of states to goto after reduction. Indexed according to $gotoBase comment. */
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protected $goto;
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/** @var int[] Table indexed analogously to $goto. If $gotoCheck[$gotoBase[$nonTerminal] + $state] != $nonTerminal
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* then the goto state is defaulted, i.e. $gotoDefault[$nonTerminal] should be used. */
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protected $gotoCheck;
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/** @var int[] Map of non-terminals to the default state to goto after their reduction */
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protected $gotoDefault;
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/** @var int[] Map of rules to the non-terminal on their left-hand side, i.e. the non-terminal to use for
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* determining the state to goto after reduction. */
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protected $ruleToNonTerminal;
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/** @var int[] Map of rules to the length of their right-hand side, which is the number of elements that have to
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* be popped from the stack(s) on reduction. */
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protected $ruleToLength;
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/*
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* The following members are part of the parser state:
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*/
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/** @var mixed Temporary value containing the result of last semantic action (reduction) */
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protected $semValue;
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/** @var mixed[] Semantic value stack (contains values of tokens and semantic action results) */
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protected $semStack;
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/** @var array<string, mixed>[] Start attribute stack */
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protected $startAttributeStack;
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/** @var array<string, mixed>[] End attribute stack */
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protected $endAttributeStack;
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/** @var array<string, mixed> End attributes of last *shifted* token */
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protected $endAttributes;
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/** @var array<string, mixed> Start attributes of last *read* token */
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protected $lookaheadStartAttributes;
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/** @var ErrorHandler Error handler */
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protected $errorHandler;
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/** @var int Error state, used to avoid error floods */
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protected $errorState;
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/** @var \SplObjectStorage<Array_, null>|null Array nodes created during parsing, for postprocessing of empty elements. */
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protected $createdArrays;
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/**
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* Initialize $reduceCallbacks map.
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*/
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abstract protected function initReduceCallbacks(): void;
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/**
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* Creates a parser instance.
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*
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* Options:
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* * phpVersion: ?PhpVersion,
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*
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* @param Lexer $lexer A lexer
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* @param PhpVersion $phpVersion PHP version to target, defaults to latest supported. This
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* option is best-effort: Even if specified, parsing will generally assume the latest
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* supported version and only adjust behavior in minor ways, for example by omitting
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* errors in older versions and interpreting type hints as a name or identifier depending
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* on version.
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*/
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public function __construct(Lexer $lexer, ?PhpVersion $phpVersion = null) {
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$this->lexer = $lexer;
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$this->phpVersion = $phpVersion ?? PhpVersion::getNewestSupported();
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$this->initReduceCallbacks();
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$this->phpTokenToSymbol = $this->createTokenMap();
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}
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/**
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* Parses PHP code into a node tree.
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*
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* If a non-throwing error handler is used, the parser will continue parsing after an error
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* occurred and attempt to build a partial AST.
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*
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* @param string $code The source code to parse
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* @param ErrorHandler|null $errorHandler Error handler to use for lexer/parser errors, defaults
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* to ErrorHandler\Throwing.
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*
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* @return Node\Stmt[]|null Array of statements (or null non-throwing error handler is used and
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* the parser was unable to recover from an error).
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*/
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public function parse(string $code, ?ErrorHandler $errorHandler = null): ?array {
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$this->errorHandler = $errorHandler ?: new ErrorHandler\Throwing();
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$this->createdArrays = new \SplObjectStorage();
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$this->lexer->startLexing($code, $this->errorHandler);
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$result = $this->doParse();
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// Report errors for any empty elements used inside arrays. This is delayed until after the main parse,
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// because we don't know a priori whether a given array expression will be used in a destructuring context
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// or not.
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foreach ($this->createdArrays as $node) {
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foreach ($node->items as $item) {
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if ($item->value instanceof Expr\Error) {
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$this->errorHandler->handleError(
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new Error('Cannot use empty array elements in arrays', $item->getAttributes()));
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}
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}
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}
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// Clear out some of the interior state, so we don't hold onto unnecessary
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// memory between uses of the parser
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$this->startAttributeStack = [];
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$this->endAttributeStack = [];
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$this->semStack = [];
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$this->semValue = null;
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$this->createdArrays = null;
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return $result;
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}
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public function getLexer(): Lexer {
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return $this->lexer;
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}
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/** @return Stmt[]|null */
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protected function doParse(): ?array {
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// We start off with no lookahead-token
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$symbol = self::SYMBOL_NONE;
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// The attributes for a node are taken from the first and last token of the node.
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// From the first token only the startAttributes are taken and from the last only
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// the endAttributes. Both are merged using the array union operator (+).
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$startAttributes = [];
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$endAttributes = [];
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$this->endAttributes = $endAttributes;
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// Keep stack of start and end attributes
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$this->startAttributeStack = [];
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$this->endAttributeStack = [$endAttributes];
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// Start off in the initial state and keep a stack of previous states
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$state = 0;
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$stateStack = [$state];
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// Semantic value stack (contains values of tokens and semantic action results)
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$this->semStack = [];
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// Current position in the stack(s)
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$stackPos = 0;
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$this->errorState = 0;
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for (;;) {
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//$this->traceNewState($state, $symbol);
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if ($this->actionBase[$state] === 0) {
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$rule = $this->actionDefault[$state];
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} else {
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if ($symbol === self::SYMBOL_NONE) {
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// Fetch the next token id from the lexer and fetch additional info by-ref.
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// The end attributes are fetched into a temporary variable and only set once the token is really
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// shifted (not during read). Otherwise you would sometimes get off-by-one errors, when a rule is
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// reduced after a token was read but not yet shifted.
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$tokenId = $this->lexer->getNextToken($tokenValue, $startAttributes, $endAttributes);
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// Map the lexer token id to the internally used symbols.
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if (!isset($this->phpTokenToSymbol[$tokenId])) {
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throw new \RangeException(sprintf(
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'The lexer returned an invalid token (id=%d, value=%s)',
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$tokenId, $tokenValue
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));
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}
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$symbol = $this->phpTokenToSymbol[$tokenId];
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// Allow productions to access the start attributes of the lookahead token.
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$this->lookaheadStartAttributes = $startAttributes;
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//$this->traceRead($symbol);
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}
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$idx = $this->actionBase[$state] + $symbol;
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if ((($idx >= 0 && $idx < $this->actionTableSize && $this->actionCheck[$idx] === $symbol)
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|| ($state < $this->YY2TBLSTATE
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&& ($idx = $this->actionBase[$state + $this->numNonLeafStates] + $symbol) >= 0
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&& $idx < $this->actionTableSize && $this->actionCheck[$idx] === $symbol))
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&& ($action = $this->action[$idx]) !== $this->defaultAction) {
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/*
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* >= numNonLeafStates: shift and reduce
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* > 0: shift
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* = 0: accept
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* < 0: reduce
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* = -YYUNEXPECTED: error
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*/
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if ($action > 0) {
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/* shift */
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//$this->traceShift($symbol);
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++$stackPos;
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$stateStack[$stackPos] = $state = $action;
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$this->semStack[$stackPos] = $tokenValue;
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$this->startAttributeStack[$stackPos] = $startAttributes;
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$this->endAttributeStack[$stackPos] = $endAttributes;
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$this->endAttributes = $endAttributes;
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$symbol = self::SYMBOL_NONE;
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if ($this->errorState) {
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--$this->errorState;
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}
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if ($action < $this->numNonLeafStates) {
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continue;
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}
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/* $yyn >= numNonLeafStates means shift-and-reduce */
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$rule = $action - $this->numNonLeafStates;
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} else {
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$rule = -$action;
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}
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} else {
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$rule = $this->actionDefault[$state];
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}
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}
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for (;;) {
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if ($rule === 0) {
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/* accept */
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//$this->traceAccept();
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return $this->semValue;
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}
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if ($rule !== $this->unexpectedTokenRule) {
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/* reduce */
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//$this->traceReduce($rule);
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try {
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$this->reduceCallbacks[$rule]($stackPos);
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} catch (Error $e) {
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if (-1 === $e->getStartLine() && isset($startAttributes['startLine'])) {
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$e->setStartLine($startAttributes['startLine']);
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}
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$this->emitError($e);
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// Can't recover from this type of error
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return null;
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}
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/* Goto - shift nonterminal */
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$lastEndAttributes = $this->endAttributeStack[$stackPos];
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$ruleLength = $this->ruleToLength[$rule];
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$stackPos -= $ruleLength;
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$nonTerminal = $this->ruleToNonTerminal[$rule];
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$idx = $this->gotoBase[$nonTerminal] + $stateStack[$stackPos];
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if ($idx >= 0 && $idx < $this->gotoTableSize && $this->gotoCheck[$idx] === $nonTerminal) {
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$state = $this->goto[$idx];
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} else {
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$state = $this->gotoDefault[$nonTerminal];
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}
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++$stackPos;
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$stateStack[$stackPos] = $state;
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$this->semStack[$stackPos] = $this->semValue;
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$this->endAttributeStack[$stackPos] = $lastEndAttributes;
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if ($ruleLength === 0) {
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// Empty productions use the start attributes of the lookahead token.
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$this->startAttributeStack[$stackPos] = $this->lookaheadStartAttributes;
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}
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} else {
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/* error */
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switch ($this->errorState) {
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case 0:
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$msg = $this->getErrorMessage($symbol, $state);
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$this->emitError(new Error($msg, $startAttributes + $endAttributes));
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// Break missing intentionally
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// no break
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case 1:
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case 2:
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$this->errorState = 3;
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// Pop until error-expecting state uncovered
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while (!(
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(($idx = $this->actionBase[$state] + $this->errorSymbol) >= 0
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&& $idx < $this->actionTableSize && $this->actionCheck[$idx] === $this->errorSymbol)
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|| ($state < $this->YY2TBLSTATE
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&& ($idx = $this->actionBase[$state + $this->numNonLeafStates] + $this->errorSymbol) >= 0
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&& $idx < $this->actionTableSize && $this->actionCheck[$idx] === $this->errorSymbol)
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) || ($action = $this->action[$idx]) === $this->defaultAction) { // Not totally sure about this
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if ($stackPos <= 0) {
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// Could not recover from error
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return null;
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}
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$state = $stateStack[--$stackPos];
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//$this->tracePop($state);
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}
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//$this->traceShift($this->errorSymbol);
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++$stackPos;
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$stateStack[$stackPos] = $state = $action;
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// We treat the error symbol as being empty, so we reset the end attributes
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// to the end attributes of the last non-error symbol
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$this->startAttributeStack[$stackPos] = $this->lookaheadStartAttributes;
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$this->endAttributeStack[$stackPos] = $this->endAttributeStack[$stackPos - 1];
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$this->endAttributes = $this->endAttributeStack[$stackPos - 1];
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break;
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case 3:
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if ($symbol === 0) {
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// Reached EOF without recovering from error
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return null;
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}
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//$this->traceDiscard($symbol);
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$symbol = self::SYMBOL_NONE;
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break 2;
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}
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}
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if ($state < $this->numNonLeafStates) {
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break;
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}
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/* >= numNonLeafStates means shift-and-reduce */
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$rule = $state - $this->numNonLeafStates;
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}
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}
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throw new \RuntimeException('Reached end of parser loop');
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}
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protected function emitError(Error $error): void {
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$this->errorHandler->handleError($error);
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}
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/**
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* Format error message including expected tokens.
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*
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* @param int $symbol Unexpected symbol
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* @param int $state State at time of error
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*
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* @return string Formatted error message
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*/
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protected function getErrorMessage(int $symbol, int $state): string {
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$expectedString = '';
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if ($expected = $this->getExpectedTokens($state)) {
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$expectedString = ', expecting ' . implode(' or ', $expected);
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}
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return 'Syntax error, unexpected ' . $this->symbolToName[$symbol] . $expectedString;
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}
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/**
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* Get limited number of expected tokens in given state.
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*
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* @param int $state State
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*
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* @return string[] Expected tokens. If too many, an empty array is returned.
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*/
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protected function getExpectedTokens(int $state): array {
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$expected = [];
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$base = $this->actionBase[$state];
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foreach ($this->symbolToName as $symbol => $name) {
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$idx = $base + $symbol;
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if ($idx >= 0 && $idx < $this->actionTableSize && $this->actionCheck[$idx] === $symbol
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|| $state < $this->YY2TBLSTATE
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&& ($idx = $this->actionBase[$state + $this->numNonLeafStates] + $symbol) >= 0
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&& $idx < $this->actionTableSize && $this->actionCheck[$idx] === $symbol
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) {
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if ($this->action[$idx] !== $this->unexpectedTokenRule
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&& $this->action[$idx] !== $this->defaultAction
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&& $symbol !== $this->errorSymbol
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) {
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if (count($expected) === 4) {
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/* Too many expected tokens */
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return [];
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}
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$expected[] = $name;
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}
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}
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}
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return $expected;
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}
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/*
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* Tracing functions used for debugging the parser.
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*/
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/*
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protected function traceNewState($state, $symbol): void {
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echo '% State ' . $state
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. ', Lookahead ' . ($symbol == self::SYMBOL_NONE ? '--none--' : $this->symbolToName[$symbol]) . "\n";
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}
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protected function traceRead($symbol): void {
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echo '% Reading ' . $this->symbolToName[$symbol] . "\n";
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}
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protected function traceShift($symbol): void {
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echo '% Shift ' . $this->symbolToName[$symbol] . "\n";
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}
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protected function traceAccept(): void {
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echo "% Accepted.\n";
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}
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protected function traceReduce($n): void {
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echo '% Reduce by (' . $n . ') ' . $this->productions[$n] . "\n";
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}
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protected function tracePop($state): void {
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echo '% Recovering, uncovered state ' . $state . "\n";
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}
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protected function traceDiscard($symbol): void {
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echo '% Discard ' . $this->symbolToName[$symbol] . "\n";
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}
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*/
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/*
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* Helper functions invoked by semantic actions
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*/
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|
|
/**
|
|
* Moves statements of semicolon-style namespaces into $ns->stmts and checks various error conditions.
|
|
*
|
|
* @param Node\Stmt[] $stmts
|
|
* @return Node\Stmt[]
|
|
*/
|
|
protected function handleNamespaces(array $stmts): array {
|
|
$hasErrored = false;
|
|
$style = $this->getNamespacingStyle($stmts);
|
|
if (null === $style) {
|
|
// not namespaced, nothing to do
|
|
return $stmts;
|
|
}
|
|
if ('brace' === $style) {
|
|
// For braced namespaces we only have to check that there are no invalid statements between the namespaces
|
|
$afterFirstNamespace = false;
|
|
foreach ($stmts as $stmt) {
|
|
if ($stmt instanceof Node\Stmt\Namespace_) {
|
|
$afterFirstNamespace = true;
|
|
} elseif (!$stmt instanceof Node\Stmt\HaltCompiler
|
|
&& !$stmt instanceof Node\Stmt\Nop
|
|
&& $afterFirstNamespace && !$hasErrored) {
|
|
$this->emitError(new Error(
|
|
'No code may exist outside of namespace {}', $stmt->getAttributes()));
|
|
$hasErrored = true; // Avoid one error for every statement
|
|
}
|
|
}
|
|
return $stmts;
|
|
} else {
|
|
// For semicolon namespaces we have to move the statements after a namespace declaration into ->stmts
|
|
$resultStmts = [];
|
|
$targetStmts =& $resultStmts;
|
|
$lastNs = null;
|
|
foreach ($stmts as $stmt) {
|
|
if ($stmt instanceof Node\Stmt\Namespace_) {
|
|
if ($lastNs !== null) {
|
|
$this->fixupNamespaceAttributes($lastNs);
|
|
}
|
|
if ($stmt->stmts === null) {
|
|
$stmt->stmts = [];
|
|
$targetStmts =& $stmt->stmts;
|
|
$resultStmts[] = $stmt;
|
|
} else {
|
|
// This handles the invalid case of mixed style namespaces
|
|
$resultStmts[] = $stmt;
|
|
$targetStmts =& $resultStmts;
|
|
}
|
|
$lastNs = $stmt;
|
|
} elseif ($stmt instanceof Node\Stmt\HaltCompiler) {
|
|
// __halt_compiler() is not moved into the namespace
|
|
$resultStmts[] = $stmt;
|
|
} else {
|
|
$targetStmts[] = $stmt;
|
|
}
|
|
}
|
|
if ($lastNs !== null) {
|
|
$this->fixupNamespaceAttributes($lastNs);
|
|
}
|
|
return $resultStmts;
|
|
}
|
|
}
|
|
|
|
private function fixupNamespaceAttributes(Node\Stmt\Namespace_ $stmt): void {
|
|
// We moved the statements into the namespace node, as such the end of the namespace node
|
|
// needs to be extended to the end of the statements.
|
|
if (empty($stmt->stmts)) {
|
|
return;
|
|
}
|
|
|
|
// We only move the builtin end attributes here. This is the best we can do with the
|
|
// knowledge we have.
|
|
$endAttributes = ['endLine', 'endFilePos', 'endTokenPos'];
|
|
$lastStmt = $stmt->stmts[count($stmt->stmts) - 1];
|
|
foreach ($endAttributes as $endAttribute) {
|
|
if ($lastStmt->hasAttribute($endAttribute)) {
|
|
$stmt->setAttribute($endAttribute, $lastStmt->getAttribute($endAttribute));
|
|
}
|
|
}
|
|
}
|
|
|
|
/** @return array<string, mixed> */
|
|
private function getNamespaceErrorAttributes(Namespace_ $node): array {
|
|
$attrs = $node->getAttributes();
|
|
// Adjust end attributes to only cover the "namespace" keyword, not the whole namespace.
|
|
if (isset($attrs['startLine'])) {
|
|
$attrs['endLine'] = $attrs['startLine'];
|
|
}
|
|
if (isset($attrs['startTokenPos'])) {
|
|
$attrs['endTokenPos'] = $attrs['startTokenPos'];
|
|
}
|
|
if (isset($attrs['startFilePos'])) {
|
|
$attrs['endFilePos'] = $attrs['startFilePos'] + \strlen('namespace') - 1;
|
|
}
|
|
return $attrs;
|
|
}
|
|
|
|
/**
|
|
* Determine namespacing style (semicolon or brace)
|
|
*
|
|
* @param Node[] $stmts Top-level statements.
|
|
*
|
|
* @return null|string One of "semicolon", "brace" or null (no namespaces)
|
|
*/
|
|
private function getNamespacingStyle(array $stmts): ?string {
|
|
$style = null;
|
|
$hasNotAllowedStmts = false;
|
|
foreach ($stmts as $i => $stmt) {
|
|
if ($stmt instanceof Node\Stmt\Namespace_) {
|
|
$currentStyle = null === $stmt->stmts ? 'semicolon' : 'brace';
|
|
if (null === $style) {
|
|
$style = $currentStyle;
|
|
if ($hasNotAllowedStmts) {
|
|
$this->emitError(new Error(
|
|
'Namespace declaration statement has to be the very first statement in the script',
|
|
$this->getNamespaceErrorAttributes($stmt)
|
|
));
|
|
}
|
|
} elseif ($style !== $currentStyle) {
|
|
$this->emitError(new Error(
|
|
'Cannot mix bracketed namespace declarations with unbracketed namespace declarations',
|
|
$this->getNamespaceErrorAttributes($stmt)
|
|
));
|
|
// Treat like semicolon style for namespace normalization
|
|
return 'semicolon';
|
|
}
|
|
continue;
|
|
}
|
|
|
|
/* declare(), __halt_compiler() and nops can be used before a namespace declaration */
|
|
if ($stmt instanceof Node\Stmt\Declare_
|
|
|| $stmt instanceof Node\Stmt\HaltCompiler
|
|
|| $stmt instanceof Node\Stmt\Nop) {
|
|
continue;
|
|
}
|
|
|
|
/* There may be a hashbang line at the very start of the file */
|
|
if ($i === 0 && $stmt instanceof Node\Stmt\InlineHTML && preg_match('/\A#!.*\r?\n\z/', $stmt->value)) {
|
|
continue;
|
|
}
|
|
|
|
/* Everything else if forbidden before namespace declarations */
|
|
$hasNotAllowedStmts = true;
|
|
}
|
|
return $style;
|
|
}
|
|
|
|
/** @return Name|Identifier */
|
|
protected function handleBuiltinTypes(Name $name) {
|
|
if (!$name->isUnqualified()) {
|
|
return $name;
|
|
}
|
|
|
|
$lowerName = $name->toLowerString();
|
|
if (!$this->phpVersion->supportsBuiltinType($lowerName)) {
|
|
return $name;
|
|
}
|
|
|
|
return new Node\Identifier($lowerName, $name->getAttributes());
|
|
}
|
|
|
|
/**
|
|
* Get combined start and end attributes at a stack location
|
|
*
|
|
* @param int $pos Stack location
|
|
*
|
|
* @return array<string, mixed> Combined start and end attributes
|
|
*/
|
|
protected function getAttributesAt(int $pos): array {
|
|
return $this->startAttributeStack[$pos] + $this->endAttributeStack[$pos];
|
|
}
|
|
|
|
protected function getFloatCastKind(string $cast): int {
|
|
$cast = strtolower($cast);
|
|
if (strpos($cast, 'float') !== false) {
|
|
return Double::KIND_FLOAT;
|
|
}
|
|
|
|
if (strpos($cast, 'real') !== false) {
|
|
return Double::KIND_REAL;
|
|
}
|
|
|
|
return Double::KIND_DOUBLE;
|
|
}
|
|
|
|
/** @param array<string, mixed> $attributes */
|
|
protected function parseLNumber(string $str, array $attributes, bool $allowInvalidOctal = false): Int_ {
|
|
try {
|
|
return Int_::fromString($str, $attributes, $allowInvalidOctal);
|
|
} catch (Error $error) {
|
|
$this->emitError($error);
|
|
// Use dummy value
|
|
return new Int_(0, $attributes);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Parse a T_NUM_STRING token into either an integer or string node.
|
|
*
|
|
* @param string $str Number string
|
|
* @param array<string, mixed> $attributes Attributes
|
|
*
|
|
* @return Int_|String_ Integer or string node.
|
|
*/
|
|
protected function parseNumString(string $str, array $attributes) {
|
|
if (!preg_match('/^(?:0|-?[1-9][0-9]*)$/', $str)) {
|
|
return new String_($str, $attributes);
|
|
}
|
|
|
|
$num = +$str;
|
|
if (!is_int($num)) {
|
|
return new String_($str, $attributes);
|
|
}
|
|
|
|
return new Int_($num, $attributes);
|
|
}
|
|
|
|
/** @param array<string, mixed> $attributes */
|
|
protected function stripIndentation(
|
|
string $string, int $indentLen, string $indentChar,
|
|
bool $newlineAtStart, bool $newlineAtEnd, array $attributes
|
|
): string {
|
|
if ($indentLen === 0) {
|
|
return $string;
|
|
}
|
|
|
|
$start = $newlineAtStart ? '(?:(?<=\n)|\A)' : '(?<=\n)';
|
|
$end = $newlineAtEnd ? '(?:(?=[\r\n])|\z)' : '(?=[\r\n])';
|
|
$regex = '/' . $start . '([ \t]*)(' . $end . ')?/';
|
|
return preg_replace_callback(
|
|
$regex,
|
|
function ($matches) use ($indentLen, $indentChar, $attributes) {
|
|
$prefix = substr($matches[1], 0, $indentLen);
|
|
if (false !== strpos($prefix, $indentChar === " " ? "\t" : " ")) {
|
|
$this->emitError(new Error(
|
|
'Invalid indentation - tabs and spaces cannot be mixed', $attributes
|
|
));
|
|
} elseif (strlen($prefix) < $indentLen && !isset($matches[2])) {
|
|
$this->emitError(new Error(
|
|
'Invalid body indentation level ' .
|
|
'(expecting an indentation level of at least ' . $indentLen . ')',
|
|
$attributes
|
|
));
|
|
}
|
|
return substr($matches[0], strlen($prefix));
|
|
},
|
|
$string
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @param string|(Expr|InterpolatedStringPart)[] $contents
|
|
* @param array<string, mixed> $attributes
|
|
* @param array<string, mixed> $endTokenAttributes
|
|
*/
|
|
protected function parseDocString(
|
|
string $startToken, $contents, string $endToken,
|
|
array $attributes, array $endTokenAttributes, bool $parseUnicodeEscape
|
|
): Expr {
|
|
$kind = strpos($startToken, "'") === false
|
|
? String_::KIND_HEREDOC : String_::KIND_NOWDOC;
|
|
|
|
$regex = '/\A[bB]?<<<[ \t]*[\'"]?([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)[\'"]?(?:\r\n|\n|\r)\z/';
|
|
$result = preg_match($regex, $startToken, $matches);
|
|
assert($result === 1);
|
|
$label = $matches[1];
|
|
|
|
$result = preg_match('/\A[ \t]*/', $endToken, $matches);
|
|
assert($result === 1);
|
|
$indentation = $matches[0];
|
|
|
|
$attributes['kind'] = $kind;
|
|
$attributes['docLabel'] = $label;
|
|
$attributes['docIndentation'] = $indentation;
|
|
|
|
$indentHasSpaces = false !== strpos($indentation, " ");
|
|
$indentHasTabs = false !== strpos($indentation, "\t");
|
|
if ($indentHasSpaces && $indentHasTabs) {
|
|
$this->emitError(new Error(
|
|
'Invalid indentation - tabs and spaces cannot be mixed',
|
|
$endTokenAttributes
|
|
));
|
|
|
|
// Proceed processing as if this doc string is not indented
|
|
$indentation = '';
|
|
}
|
|
|
|
$indentLen = \strlen($indentation);
|
|
$indentChar = $indentHasSpaces ? " " : "\t";
|
|
|
|
if (\is_string($contents)) {
|
|
if ($contents === '') {
|
|
return new String_('', $attributes);
|
|
}
|
|
|
|
$contents = $this->stripIndentation(
|
|
$contents, $indentLen, $indentChar, true, true, $attributes
|
|
);
|
|
$contents = preg_replace('~(\r\n|\n|\r)\z~', '', $contents);
|
|
|
|
if ($kind === String_::KIND_HEREDOC) {
|
|
$contents = String_::parseEscapeSequences($contents, null, $parseUnicodeEscape);
|
|
}
|
|
|
|
return new String_($contents, $attributes);
|
|
} else {
|
|
assert(count($contents) > 0);
|
|
if (!$contents[0] instanceof Node\InterpolatedStringPart) {
|
|
// If there is no leading encapsed string part, pretend there is an empty one
|
|
$this->stripIndentation(
|
|
'', $indentLen, $indentChar, true, false, $contents[0]->getAttributes()
|
|
);
|
|
}
|
|
|
|
$newContents = [];
|
|
foreach ($contents as $i => $part) {
|
|
if ($part instanceof Node\InterpolatedStringPart) {
|
|
$isLast = $i === \count($contents) - 1;
|
|
$part->value = $this->stripIndentation(
|
|
$part->value, $indentLen, $indentChar,
|
|
$i === 0, $isLast, $part->getAttributes()
|
|
);
|
|
if ($isLast) {
|
|
$part->value = preg_replace('~(\r\n|\n|\r)\z~', '', $part->value);
|
|
}
|
|
$part->value = String_::parseEscapeSequences($part->value, null, $parseUnicodeEscape);
|
|
if ('' === $part->value) {
|
|
continue;
|
|
}
|
|
}
|
|
$newContents[] = $part;
|
|
}
|
|
return new InterpolatedString($newContents, $attributes);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Create attributes for a zero-length common-capturing nop.
|
|
*
|
|
* @param Comment[] $comments
|
|
* @return array<string, mixed>
|
|
*/
|
|
protected function createCommentNopAttributes(array $comments): array {
|
|
$comment = $comments[count($comments) - 1];
|
|
$commentEndLine = $comment->getEndLine();
|
|
$commentEndFilePos = $comment->getEndFilePos();
|
|
$commentEndTokenPos = $comment->getEndTokenPos();
|
|
|
|
$attributes = ['comments' => $comments];
|
|
if (-1 !== $commentEndLine) {
|
|
$attributes['startLine'] = $commentEndLine;
|
|
$attributes['endLine'] = $commentEndLine;
|
|
}
|
|
if (-1 !== $commentEndFilePos) {
|
|
$attributes['startFilePos'] = $commentEndFilePos + 1;
|
|
$attributes['endFilePos'] = $commentEndFilePos;
|
|
}
|
|
if (-1 !== $commentEndTokenPos) {
|
|
$attributes['startTokenPos'] = $commentEndTokenPos + 1;
|
|
$attributes['endTokenPos'] = $commentEndTokenPos;
|
|
}
|
|
return $attributes;
|
|
}
|
|
|
|
/**
|
|
* @param array<string, mixed> $attrs
|
|
* @return array<string, mixed>
|
|
*/
|
|
protected function createEmptyElemAttributes(array $attrs): array {
|
|
if (isset($attrs['startLine'])) {
|
|
$attrs['endLine'] = $attrs['startLine'];
|
|
}
|
|
if (isset($attrs['startFilePos'])) {
|
|
$attrs['endFilePos'] = $attrs['startFilePos'];
|
|
}
|
|
if (isset($attrs['startTokenPos'])) {
|
|
$attrs['endTokenPos'] = $attrs['startTokenPos'];
|
|
}
|
|
return $attrs;
|
|
}
|
|
|
|
protected function fixupArrayDestructuring(Array_ $node): Expr\List_ {
|
|
$this->createdArrays->detach($node);
|
|
return new Expr\List_(array_map(function (Node\ArrayItem $item) {
|
|
if ($item->value instanceof Expr\Error) {
|
|
// We used Error as a placeholder for empty elements, which are legal for destructuring.
|
|
return null;
|
|
}
|
|
if ($item->value instanceof Array_) {
|
|
return new Node\ArrayItem(
|
|
$this->fixupArrayDestructuring($item->value),
|
|
$item->key, $item->byRef, $item->getAttributes());
|
|
}
|
|
return $item;
|
|
}, $node->items), ['kind' => Expr\List_::KIND_ARRAY] + $node->getAttributes());
|
|
}
|
|
|
|
protected function postprocessList(Expr\List_ $node): void {
|
|
foreach ($node->items as $i => $item) {
|
|
if ($item->value instanceof Expr\Error) {
|
|
// We used Error as a placeholder for empty elements, which are legal for destructuring.
|
|
$node->items[$i] = null;
|
|
}
|
|
}
|
|
}
|
|
|
|
/** @param ElseIf_|Else_ $node */
|
|
protected function fixupAlternativeElse($node): void {
|
|
// Make sure a trailing nop statement carrying comments is part of the node.
|
|
$numStmts = \count($node->stmts);
|
|
if ($numStmts !== 0 && $node->stmts[$numStmts - 1] instanceof Nop) {
|
|
$nopAttrs = $node->stmts[$numStmts - 1]->getAttributes();
|
|
if (isset($nopAttrs['endLine'])) {
|
|
$node->setAttribute('endLine', $nopAttrs['endLine']);
|
|
}
|
|
if (isset($nopAttrs['endFilePos'])) {
|
|
$node->setAttribute('endFilePos', $nopAttrs['endFilePos']);
|
|
}
|
|
if (isset($nopAttrs['endTokenPos'])) {
|
|
$node->setAttribute('endTokenPos', $nopAttrs['endTokenPos']);
|
|
}
|
|
}
|
|
}
|
|
|
|
protected function checkClassModifier(int $a, int $b, int $modifierPos): void {
|
|
try {
|
|
Modifiers::verifyClassModifier($a, $b);
|
|
} catch (Error $error) {
|
|
$error->setAttributes($this->getAttributesAt($modifierPos));
|
|
$this->emitError($error);
|
|
}
|
|
}
|
|
|
|
protected function checkModifier(int $a, int $b, int $modifierPos): void {
|
|
// Jumping through some hoops here because verifyModifier() is also used elsewhere
|
|
try {
|
|
Modifiers::verifyModifier($a, $b);
|
|
} catch (Error $error) {
|
|
$error->setAttributes($this->getAttributesAt($modifierPos));
|
|
$this->emitError($error);
|
|
}
|
|
}
|
|
|
|
protected function checkParam(Param $node): void {
|
|
if ($node->variadic && null !== $node->default) {
|
|
$this->emitError(new Error(
|
|
'Variadic parameter cannot have a default value',
|
|
$node->default->getAttributes()
|
|
));
|
|
}
|
|
}
|
|
|
|
protected function checkTryCatch(TryCatch $node): void {
|
|
if (empty($node->catches) && null === $node->finally) {
|
|
$this->emitError(new Error(
|
|
'Cannot use try without catch or finally', $node->getAttributes()
|
|
));
|
|
}
|
|
}
|
|
|
|
protected function checkNamespace(Namespace_ $node): void {
|
|
if (null !== $node->stmts) {
|
|
foreach ($node->stmts as $stmt) {
|
|
if ($stmt instanceof Namespace_) {
|
|
$this->emitError(new Error(
|
|
'Namespace declarations cannot be nested', $stmt->getAttributes()
|
|
));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
private function checkClassName(?Identifier $name, int $namePos): void {
|
|
if (null !== $name && $name->isSpecialClassName()) {
|
|
$this->emitError(new Error(
|
|
sprintf('Cannot use \'%s\' as class name as it is reserved', $name),
|
|
$this->getAttributesAt($namePos)
|
|
));
|
|
}
|
|
}
|
|
|
|
/** @param Name[] $interfaces */
|
|
private function checkImplementedInterfaces(array $interfaces): void {
|
|
foreach ($interfaces as $interface) {
|
|
if ($interface->isSpecialClassName()) {
|
|
$this->emitError(new Error(
|
|
sprintf('Cannot use \'%s\' as interface name as it is reserved', $interface),
|
|
$interface->getAttributes()
|
|
));
|
|
}
|
|
}
|
|
}
|
|
|
|
protected function checkClass(Class_ $node, int $namePos): void {
|
|
$this->checkClassName($node->name, $namePos);
|
|
|
|
if ($node->extends && $node->extends->isSpecialClassName()) {
|
|
$this->emitError(new Error(
|
|
sprintf('Cannot use \'%s\' as class name as it is reserved', $node->extends),
|
|
$node->extends->getAttributes()
|
|
));
|
|
}
|
|
|
|
$this->checkImplementedInterfaces($node->implements);
|
|
}
|
|
|
|
protected function checkInterface(Interface_ $node, int $namePos): void {
|
|
$this->checkClassName($node->name, $namePos);
|
|
$this->checkImplementedInterfaces($node->extends);
|
|
}
|
|
|
|
protected function checkEnum(Enum_ $node, int $namePos): void {
|
|
$this->checkClassName($node->name, $namePos);
|
|
$this->checkImplementedInterfaces($node->implements);
|
|
}
|
|
|
|
protected function checkClassMethod(ClassMethod $node, int $modifierPos): void {
|
|
if ($node->flags & Modifiers::STATIC) {
|
|
switch ($node->name->toLowerString()) {
|
|
case '__construct':
|
|
$this->emitError(new Error(
|
|
sprintf('Constructor %s() cannot be static', $node->name),
|
|
$this->getAttributesAt($modifierPos)));
|
|
break;
|
|
case '__destruct':
|
|
$this->emitError(new Error(
|
|
sprintf('Destructor %s() cannot be static', $node->name),
|
|
$this->getAttributesAt($modifierPos)));
|
|
break;
|
|
case '__clone':
|
|
$this->emitError(new Error(
|
|
sprintf('Clone method %s() cannot be static', $node->name),
|
|
$this->getAttributesAt($modifierPos)));
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ($node->flags & Modifiers::READONLY) {
|
|
$this->emitError(new Error(
|
|
sprintf('Method %s() cannot be readonly', $node->name),
|
|
$this->getAttributesAt($modifierPos)));
|
|
}
|
|
}
|
|
|
|
protected function checkClassConst(ClassConst $node, int $modifierPos): void {
|
|
if ($node->flags & Modifiers::STATIC) {
|
|
$this->emitError(new Error(
|
|
"Cannot use 'static' as constant modifier",
|
|
$this->getAttributesAt($modifierPos)));
|
|
}
|
|
if ($node->flags & Modifiers::ABSTRACT) {
|
|
$this->emitError(new Error(
|
|
"Cannot use 'abstract' as constant modifier",
|
|
$this->getAttributesAt($modifierPos)));
|
|
}
|
|
if ($node->flags & Modifiers::READONLY) {
|
|
$this->emitError(new Error(
|
|
"Cannot use 'readonly' as constant modifier",
|
|
$this->getAttributesAt($modifierPos)));
|
|
}
|
|
}
|
|
|
|
protected function checkProperty(Property $node, int $modifierPos): void {
|
|
if ($node->flags & Modifiers::ABSTRACT) {
|
|
$this->emitError(new Error('Properties cannot be declared abstract',
|
|
$this->getAttributesAt($modifierPos)));
|
|
}
|
|
|
|
if ($node->flags & Modifiers::FINAL) {
|
|
$this->emitError(new Error('Properties cannot be declared final',
|
|
$this->getAttributesAt($modifierPos)));
|
|
}
|
|
}
|
|
|
|
protected function checkUseUse(UseItem $node, int $namePos): void {
|
|
if ($node->alias && $node->alias->isSpecialClassName()) {
|
|
$this->emitError(new Error(
|
|
sprintf(
|
|
'Cannot use %s as %s because \'%2$s\' is a special class name',
|
|
$node->name, $node->alias
|
|
),
|
|
$this->getAttributesAt($namePos)
|
|
));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Creates the token map.
|
|
*
|
|
* The token map maps the PHP internal token identifiers
|
|
* to the identifiers used by the Parser. Additionally it
|
|
* maps T_OPEN_TAG_WITH_ECHO to T_ECHO and T_CLOSE_TAG to ';'.
|
|
*
|
|
* @return array<int, int> The token map
|
|
*/
|
|
protected function createTokenMap(): array {
|
|
$tokenMap = [];
|
|
|
|
for ($i = 0; $i < 1000; ++$i) {
|
|
if ($i < 256) {
|
|
// Single-char tokens use an identity mapping.
|
|
$tokenMap[$i] = $i;
|
|
} elseif (\T_DOUBLE_COLON === $i) {
|
|
// T_DOUBLE_COLON is equivalent to T_PAAMAYIM_NEKUDOTAYIM
|
|
$tokenMap[$i] = static::T_PAAMAYIM_NEKUDOTAYIM;
|
|
} elseif (\T_OPEN_TAG_WITH_ECHO === $i) {
|
|
// T_OPEN_TAG_WITH_ECHO with dropped T_OPEN_TAG results in T_ECHO
|
|
$tokenMap[$i] = static::T_ECHO;
|
|
} elseif (\T_CLOSE_TAG === $i) {
|
|
// T_CLOSE_TAG is equivalent to ';'
|
|
$tokenMap[$i] = ord(';');
|
|
} elseif ('UNKNOWN' !== $name = token_name($i)) {
|
|
if (defined($name = static::class . '::' . $name)) {
|
|
// Other tokens can be mapped directly
|
|
$tokenMap[$i] = constant($name);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Assign tokens for which we define compatibility constants, as token_name() does not know them.
|
|
$tokenMap[\T_FN] = static::T_FN;
|
|
$tokenMap[\T_COALESCE_EQUAL] = static::T_COALESCE_EQUAL;
|
|
$tokenMap[\T_NAME_QUALIFIED] = static::T_NAME_QUALIFIED;
|
|
$tokenMap[\T_NAME_FULLY_QUALIFIED] = static::T_NAME_FULLY_QUALIFIED;
|
|
$tokenMap[\T_NAME_RELATIVE] = static::T_NAME_RELATIVE;
|
|
$tokenMap[\T_MATCH] = static::T_MATCH;
|
|
$tokenMap[\T_NULLSAFE_OBJECT_OPERATOR] = static::T_NULLSAFE_OBJECT_OPERATOR;
|
|
$tokenMap[\T_ATTRIBUTE] = static::T_ATTRIBUTE;
|
|
$tokenMap[\T_AMPERSAND_NOT_FOLLOWED_BY_VAR_OR_VARARG] = static::T_AMPERSAND_NOT_FOLLOWED_BY_VAR_OR_VARARG;
|
|
$tokenMap[\T_AMPERSAND_FOLLOWED_BY_VAR_OR_VARARG] = static::T_AMPERSAND_FOLLOWED_BY_VAR_OR_VARARG;
|
|
$tokenMap[\T_ENUM] = static::T_ENUM;
|
|
$tokenMap[\T_READONLY] = static::T_READONLY;
|
|
|
|
// We have create a map from PHP token IDs to external symbol IDs.
|
|
// Now map them to the internal symbol ID.
|
|
$fullTokenMap = [];
|
|
foreach ($tokenMap as $phpToken => $extSymbol) {
|
|
$intSymbol = $this->tokenToSymbol[$extSymbol];
|
|
if ($intSymbol === $this->invalidSymbol) {
|
|
continue;
|
|
}
|
|
$fullTokenMap[$phpToken] = $intSymbol;
|
|
}
|
|
|
|
return $fullTokenMap;
|
|
}
|
|
}
|