mirror of
https://github.com/danog/PHP-Parser.git
synced 2024-12-02 09:17:58 +01:00
caa5c0cc76
Nearly all special errors are now handled gracefully, i.e. the parser will be able to continue after encountering them. In some cases the associated error range has been improved using the new end attribute stack. To achieve this the error handling code has been moved out of the node constructors and into special methods in the parser.
716 lines
28 KiB
PHP
716 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 bool Whether to throw on first error */
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protected $throwOnError;
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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. The boolean 'throwOnError' option determines whether an exception should be
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* thrown on first error, or if the parser should try to continue parsing the remaining code
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* and build a partial AST.
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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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$this->throwOnError = isset($options['throwOnError']) ? $options['throwOnError'] : true;
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}
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/**
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* Get array of errors that occurred during the last parse.
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*
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* This method may only return multiple errors if the 'throwOnError' option is disabled.
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*
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* @return Error[]
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*/
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public function getErrors() {
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return $this->errors;
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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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* @param string $code The source code to parse
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*
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* @return Node[]|null Array of statements (or null if the 'throwOnError' option is disabled and the parser was
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* unable to recover from an error).
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*/
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public function parse($code) {
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// Initialize the lexer and inherit lexing errors
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$this->lexer->startLexing($code);
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$this->errors = $this->lexer->getErrors();
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if ($this->throwOnError && !empty($this->errors)) {
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throw $this->errors[0];
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}
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// We start off with no lookahead-token
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$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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$stateStack[++$this->stackPos] = $state = $action;
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break;
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case 3:
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if ($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->errors[] = $error;
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if ($this->throwOnError) {
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throw $error;
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}
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}
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protected function getErrorMessage($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] != $this->defaultAction
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) {
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if (count($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',
|
|
$stmt->getLine() // Avoid marking the entire namespace as an error
|
|
));
|
|
// Treat like semicolon style for namespace normalization
|
|
return 'semicolon';
|
|
}
|
|
continue;
|
|
}
|
|
|
|
/* declare(), __halt_compiler() and nops can be used before a namespace declaration */
|
|
if ($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;
|
|
}
|
|
|
|
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)
|
|
));
|
|
}
|
|
}
|
|
}
|