mirror of
https://github.com/danog/PHP-Parser.git
synced 2024-12-11 17:09:41 +01:00
710 lines
28 KiB
PHP
710 lines
28 KiB
PHP
<?php
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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\Name;
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use PhpParser\Node\Param;
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use PhpParser\Node\Scalar\LNumber;
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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\Interface_;
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use PhpParser\Node\Stmt\Namespace_;
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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\Stmt\UseUse;
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abstract class ParserAbstract implements Parser
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{
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const SYMBOL_NONE = -1;
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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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protected $YY2TBLSTATE;
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protected $YYNLSTATES;
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/** @var array Map of lexer tokens to internal symbols */
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protected $tokenToSymbol;
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/** @var array Map of symbols to their names */
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protected $symbolToName;
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/** @var array Names of the production rules (only necessary for debugging) */
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protected $productions;
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/** @var array 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 array Table of actions. Indexed according to $actionBase comment. */
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protected $action;
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/** @var array 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 array Map of states to their default action */
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protected $actionDefault;
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/** @var array 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 array Table of states to goto after reduction. Indexed according to $gotoBase comment. */
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protected $goto;
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/** @var array 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 array Map of non-terminals to the default state to goto after their reduction */
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protected $gotoDefault;
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/** @var array 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 array 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 Lexer Lexer that is used when parsing */
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protected $lexer;
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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 int Position in stacks (state stack, semantic value stack, attribute stack) */
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protected $stackPos;
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/** @var array Semantic value stack (contains values of tokens and semantic action results) */
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protected $semStack;
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/** @var array[] Start attribute stack */
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protected $startAttributeStack;
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/** @var array[] End attribute stack */
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protected $endAttributeStack;
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/** @var array End attributes of last *shifted* token */
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protected $endAttributes;
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/** @var array 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 Error[] Errors collected during last parse */
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protected $errors;
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/** @var int Error state, used to avoid error floods */
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protected $errorState;
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/**
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* Creates a parser instance.
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*
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* @param Lexer $lexer A lexer
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* @param array $options Options array. Currently no options are supported.
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*/
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public function __construct(Lexer $lexer, array $options = array()) {
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$this->lexer = $lexer;
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$this->errors = array();
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if (isset($options['throwOnError'])) {
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throw new \LogicException(
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'"throwOnError" is no longer supported, use "errorHandler" instead');
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}
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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 $errorHandler Error handler to use for lexer/parser errors, defaults
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* to ErrorHandler\Throwing.
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*
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* @return Node[]|null Array of statements (or null if the 'throwOnError' option is disabled and the parser was
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* unable to recover from an error).
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*/
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public function parse($code, ErrorHandler $errorHandler = null) {
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$this->errorHandler = $errorHandler ?: new ErrorHandler\Throwing;
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// Initialize the lexer
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$this->lexer->startLexing($code, $this->errorHandler);
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// We start off with no lookahead-token
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$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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$startAttributes = '*POISON';
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$endAttributes = '*POISON';
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$this->endAttributes = $endAttributes;
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// Keep stack of start and end attributes
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$this->startAttributeStack = array();
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$this->endAttributeStack = array($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 = array($state);
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// Semantic value stack (contains values of tokens and semantic action results)
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$this->semStack = array();
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// Current position in the stack(s)
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$this->stackPos = 0;
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$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, $endAttributes);
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// map the lexer token id to the internally used symbols
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$symbol = $tokenId >= 0 && $tokenId < $this->tokenToSymbolMapSize
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? $this->tokenToSymbol[$tokenId]
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: $this->invalidSymbol;
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if ($symbol === $this->invalidSymbol) {
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throw new \RangeException(sprintf(
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'The lexer returned an invalid token (id=%d, value=%s)',
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$tokenId, $tokenValue
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));
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}
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// This is necessary to assign some meaningful attributes to /* empty */ productions. They'll get
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// the attributes of the next token, even though they don't contain it themselves.
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$this->startAttributeStack[$this->stackPos+1] = $startAttributes;
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$this->endAttributeStack[$this->stackPos+1] = $endAttributes;
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$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->YYNLSTATES] + $symbol) >= 0
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&& $idx < $this->actionTableSize && $this->actionCheck[$idx] == $symbol))
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&& ($action = $this->action[$idx]) != $this->defaultAction) {
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/*
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* >= YYNLSTATES: shift and reduce
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* > 0: shift
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* = 0: accept
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* < 0: reduce
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* = -YYUNEXPECTED: error
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*/
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if ($action > 0) {
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/* shift */
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//$this->traceShift($symbol);
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++$this->stackPos;
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$stateStack[$this->stackPos] = $state = $action;
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$this->semStack[$this->stackPos] = $tokenValue;
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$this->startAttributeStack[$this->stackPos] = $startAttributes;
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$this->endAttributeStack[$this->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->YYNLSTATES) {
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continue;
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}
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/* $yyn >= YYNLSTATES means shift-and-reduce */
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$rule = $action - $this->YYNLSTATES;
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} else {
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$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 $this->semValue;
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} elseif ($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->{'reduceRule' . $rule}();
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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 = $this->endAttributeStack[$this->stackPos];
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$this->stackPos -= $this->ruleToLength[$rule];
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$nonTerminal = $this->ruleToNonTerminal[$rule];
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$idx = $this->gotoBase[$nonTerminal] + $stateStack[$this->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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++$this->stackPos;
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$stateStack[$this->stackPos] = $state;
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$this->semStack[$this->stackPos] = $this->semValue;
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$this->endAttributeStack[$this->stackPos] = $lastEndAttributes;
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} else {
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/* error */
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switch ($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 + $endAttributes));
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// Break missing intentionally
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case 1:
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case 2:
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$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->YYNLSTATES] + $this->errorSymbol) >= 0
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&& $idx < $this->actionTableSize && $this->actionCheck[$idx] == $this->errorSymbol)
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) || ($action = $this->action[$idx]) == $this->defaultAction) { // Not totally sure about this
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if ($this->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 = $stateStack[--$this->stackPos];
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//$this->tracePop($state);
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}
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//$this->traceShift($this->errorSymbol);
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++$this->stackPos;
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$stateStack[$this->stackPos] = $state = $action;
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$this->endAttributes = $this->endAttributeStack[$this->stackPos];
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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 < $this->YYNLSTATES) {
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break;
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}
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/* >= YYNLSTATES means shift-and-reduce */
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$rule = $state - $this->YYNLSTATES;
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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 $error) {
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$this->errorHandler->handleError($error);
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}
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protected function getErrorMessage($symbol, $state) {
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$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] . $expectedString;
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}
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protected function getExpectedTokens($state) {
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$expected = array();
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$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->YYNLSTATES] + $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 array();
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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) {
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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) {
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echo '% Reading ' . $this->symbolToName[$symbol] . "\n";
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}
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protected function traceShift($symbol) {
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echo '% Shift ' . $this->symbolToName[$symbol] . "\n";
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}
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protected function traceAccept() {
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echo "% Accepted.\n";
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}
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protected function traceReduce($n) {
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echo '% Reduce by (' . $n . ') ' . $this->productions[$n] . "\n";
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}
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protected function tracePop($state) {
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echo '% Recovering, uncovered state ' . $state . "\n";
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}
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protected function traceDiscard($symbol) {
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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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/**
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* Moves statements of semicolon-style namespaces into $ns->stmts and checks various error conditions.
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*
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* @param Node[] $stmts
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* @return Node[]
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*/
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protected function handleNamespaces(array $stmts) {
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$hasErrored = false;
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$style = $this->getNamespacingStyle($stmts);
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if (null === $style) {
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// not namespaced, nothing to do
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return $stmts;
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} elseif ('brace' === $style) {
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// For braced namespaces we only have to check that there are no invalid statements between the namespaces
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$afterFirstNamespace = false;
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foreach ($stmts as $stmt) {
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if ($stmt instanceof Node\Stmt\Namespace_) {
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$afterFirstNamespace = true;
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} elseif (!$stmt instanceof Node\Stmt\HaltCompiler
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&& $afterFirstNamespace && !$hasErrored) {
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$this->emitError(new Error(
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'No code may exist outside of namespace {}', $stmt->getAttributes()));
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$hasErrored = true; // Avoid one error for every statement
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}
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}
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return $stmts;
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} else {
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// For semicolon namespaces we have to move the statements after a namespace declaration into ->stmts
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$resultStmts = array();
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$targetStmts =& $resultStmts;
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foreach ($stmts as $stmt) {
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if ($stmt instanceof Node\Stmt\Namespace_) {
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if ($stmt->stmts === null) {
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$stmt->stmts = array();
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$targetStmts =& $stmt->stmts;
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$resultStmts[] = $stmt;
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} else {
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// This handles the invalid case of mixed style namespaces
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$resultStmts[] = $stmt;
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$targetStmts =& $resultStmts;
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}
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} elseif ($stmt instanceof Node\Stmt\HaltCompiler) {
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// __halt_compiler() is not moved into the namespace
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$resultStmts[] = $stmt;
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} else {
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$targetStmts[] = $stmt;
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}
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}
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return $resultStmts;
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}
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}
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private function getNamespacingStyle(array $stmts) {
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$style = null;
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$hasNotAllowedStmts = false;
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foreach ($stmts as $i => $stmt) {
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if ($stmt instanceof Node\Stmt\Namespace_) {
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$currentStyle = null === $stmt->stmts ? 'semicolon' : 'brace';
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if (null === $style) {
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$style = $currentStyle;
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if ($hasNotAllowedStmts) {
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$this->emitError(new Error(
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'Namespace declaration statement has to be the very first statement in the script',
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$stmt->getLine() // Avoid marking the entire namespace as an error
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));
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}
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} elseif ($style !== $currentStyle) {
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$this->emitError(new Error(
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'Cannot mix bracketed namespace declarations with unbracketed namespace declarations',
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$stmt->getLine() // Avoid marking the entire namespace as an error
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));
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// Treat like semicolon style for namespace normalization
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return 'semicolon';
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}
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continue;
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}
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/* declare(), __halt_compiler() and nops can be used before a namespace declaration */
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if ($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;
|
|
}
|
|
|
|
protected function handleBuiltinTypes(Name $name) {
|
|
$scalarTypes = [
|
|
'bool' => true,
|
|
'int' => true,
|
|
'float' => true,
|
|
'string' => true,
|
|
'iterable' => true,
|
|
'void' => true,
|
|
];
|
|
|
|
if (!$name->isUnqualified()) {
|
|
return $name;
|
|
}
|
|
|
|
$lowerName = strtolower($name->toString());
|
|
return isset($scalarTypes[$lowerName]) ? $lowerName : $name;
|
|
}
|
|
|
|
protected static $specialNames = array(
|
|
'self' => true,
|
|
'parent' => true,
|
|
'static' => true,
|
|
);
|
|
|
|
protected function getAttributesAt($pos) {
|
|
return $this->startAttributeStack[$pos] + $this->endAttributeStack[$pos];
|
|
}
|
|
|
|
protected function parseLNumber($str, $attributes, $allowInvalidOctal = false) {
|
|
try {
|
|
return LNumber::fromString($str, $attributes, $allowInvalidOctal);
|
|
} catch (Error $error) {
|
|
$this->emitError($error);
|
|
// Use dummy value
|
|
return new LNumber(0, $attributes);
|
|
}
|
|
}
|
|
|
|
protected function checkModifier($a, $b, $modifierPos) {
|
|
// Jumping through some hoops here because verifyModifier() is also used elsewhere
|
|
try {
|
|
Class_::verifyModifier($a, $b);
|
|
} catch (Error $error) {
|
|
$error->setAttributes($this->getAttributesAt($modifierPos));
|
|
$this->emitError($error);
|
|
}
|
|
}
|
|
|
|
protected function checkParam(Param $node) {
|
|
if ($node->variadic && null !== $node->default) {
|
|
$this->emitError(new Error(
|
|
'Variadic parameter cannot have a default value',
|
|
$node->default->getAttributes()
|
|
));
|
|
}
|
|
}
|
|
|
|
protected function checkTryCatch(TryCatch $node) {
|
|
if (empty($node->catches) && null === $node->finally) {
|
|
$this->emitError(new Error(
|
|
'Cannot use try without catch or finally', $node->getAttributes()
|
|
));
|
|
}
|
|
}
|
|
|
|
protected function checkNamespace(Namespace_ $node) {
|
|
if (isset(self::$specialNames[strtolower($node->name)])) {
|
|
$this->emitError(new Error(
|
|
sprintf('Cannot use \'%s\' as namespace name', $node->name),
|
|
$node->name->getAttributes()
|
|
));
|
|
}
|
|
|
|
if (null !== $node->stmts) {
|
|
foreach ($node->stmts as $stmt) {
|
|
if ($stmt instanceof Namespace_) {
|
|
$this->emitError(new Error(
|
|
'Namespace declarations cannot be nested', $stmt->getAttributes()
|
|
));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
protected function checkClass(Class_ $node, $namePos) {
|
|
if (null !== $node->name && isset(self::$specialNames[strtolower($node->name)])) {
|
|
$this->emitError(new Error(
|
|
sprintf('Cannot use \'%s\' as class name as it is reserved', $node->name),
|
|
$this->getAttributesAt($namePos)
|
|
));
|
|
}
|
|
|
|
if (isset(self::$specialNames[strtolower($node->extends)])) {
|
|
$this->emitError(new Error(
|
|
sprintf('Cannot use \'%s\' as class name as it is reserved', $node->extends),
|
|
$node->extends->getAttributes()
|
|
));
|
|
}
|
|
|
|
foreach ($node->implements as $interface) {
|
|
if (isset(self::$specialNames[strtolower($interface)])) {
|
|
$this->emitError(new Error(
|
|
sprintf('Cannot use \'%s\' as interface name as it is reserved', $interface),
|
|
$interface->getAttributes()
|
|
));
|
|
}
|
|
}
|
|
}
|
|
|
|
protected function checkInterface(Interface_ $node, $namePos) {
|
|
if (null !== $node->name && isset(self::$specialNames[strtolower($node->name)])) {
|
|
$this->emitError(new Error(
|
|
sprintf('Cannot use \'%s\' as class name as it is reserved', $node->name),
|
|
$this->getAttributesAt($namePos)
|
|
));
|
|
}
|
|
|
|
foreach ($node->extends as $interface) {
|
|
if (isset(self::$specialNames[strtolower($interface)])) {
|
|
$this->emitError(new Error(
|
|
sprintf('Cannot use \'%s\' as interface name as it is reserved', $interface),
|
|
$interface->getAttributes()
|
|
));
|
|
}
|
|
}
|
|
}
|
|
|
|
protected function checkClassMethod(ClassMethod $node, $modifierPos) {
|
|
if ($node->flags & Class_::MODIFIER_STATIC) {
|
|
switch (strtolower($node->name)) {
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
protected function checkClassConst(ClassConst $node, $modifierPos) {
|
|
if ($node->flags & Class_::MODIFIER_STATIC) {
|
|
$this->emitError(new Error(
|
|
"Cannot use 'static' as constant modifier",
|
|
$this->getAttributesAt($modifierPos)));
|
|
}
|
|
if ($node->flags & Class_::MODIFIER_ABSTRACT) {
|
|
$this->emitError(new Error(
|
|
"Cannot use 'abstract' as constant modifier",
|
|
$this->getAttributesAt($modifierPos)));
|
|
}
|
|
if ($node->flags & Class_::MODIFIER_FINAL) {
|
|
$this->emitError(new Error(
|
|
"Cannot use 'final' as constant modifier",
|
|
$this->getAttributesAt($modifierPos)));
|
|
}
|
|
}
|
|
|
|
protected function checkProperty(Property $node, $modifierPos) {
|
|
if ($node->flags & Class_::MODIFIER_ABSTRACT) {
|
|
$this->emitError(new Error('Properties cannot be declared abstract',
|
|
$this->getAttributesAt($modifierPos)));
|
|
}
|
|
|
|
if ($node->flags & Class_::MODIFIER_FINAL) {
|
|
$this->emitError(new Error('Properties cannot be declared final',
|
|
$this->getAttributesAt($modifierPos)));
|
|
}
|
|
}
|
|
|
|
protected function checkUseUse(UseUse $node, $namePos) {
|
|
if ('self' == strtolower($node->alias) || 'parent' == strtolower($node->alias)) {
|
|
$this->emitError(new Error(
|
|
sprintf(
|
|
'Cannot use %s as %s because \'%2$s\' is a special class name',
|
|
$node->name, $node->alias
|
|
),
|
|
$this->getAttributesAt($namePos)
|
|
));
|
|
}
|
|
}
|
|
}
|