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- <?php
- namespace PhpParser;
- /*
- * This parser is based on a skeleton written by Moriyoshi Koizumi, which in
- * turn is based on work by Masato Bito.
- */
- use PhpParser\Node\Name;
- use PhpParser\Node\Param;
- use PhpParser\Node\Scalar\LNumber;
- use PhpParser\Node\Scalar\String_;
- use PhpParser\Node\Stmt\Class_;
- use PhpParser\Node\Stmt\ClassConst;
- use PhpParser\Node\Stmt\ClassMethod;
- use PhpParser\Node\Stmt\Interface_;
- use PhpParser\Node\Stmt\Namespace_;
- use PhpParser\Node\Stmt\Property;
- use PhpParser\Node\Stmt\TryCatch;
- use PhpParser\Node\Stmt\UseUse;
- abstract class ParserAbstract implements Parser
- {
- const SYMBOL_NONE = -1;
- /*
- * The following members will be filled with generated parsing data:
- */
- /** @var int Size of $tokenToSymbol map */
- protected $tokenToSymbolMapSize;
- /** @var int Size of $action table */
- protected $actionTableSize;
- /** @var int Size of $goto table */
- protected $gotoTableSize;
- /** @var int Symbol number signifying an invalid token */
- protected $invalidSymbol;
- /** @var int Symbol number of error recovery token */
- protected $errorSymbol;
- /** @var int Action number signifying default action */
- protected $defaultAction;
- /** @var int Rule number signifying that an unexpected token was encountered */
- protected $unexpectedTokenRule;
- protected $YY2TBLSTATE;
- protected $YYNLSTATES;
- /** @var array Map of lexer tokens to internal symbols */
- protected $tokenToSymbol;
- /** @var array Map of symbols to their names */
- protected $symbolToName;
- /** @var array Names of the production rules (only necessary for debugging) */
- protected $productions;
- /** @var array Map of states to a displacement into the $action table. The corresponding action for this
- * state/symbol pair is $action[$actionBase[$state] + $symbol]. If $actionBase[$state] is 0, the
- action is defaulted, i.e. $actionDefault[$state] should be used instead. */
- protected $actionBase;
- /** @var array Table of actions. Indexed according to $actionBase comment. */
- protected $action;
- /** @var array Table indexed analogously to $action. If $actionCheck[$actionBase[$state] + $symbol] != $symbol
- * then the action is defaulted, i.e. $actionDefault[$state] should be used instead. */
- protected $actionCheck;
- /** @var array Map of states to their default action */
- protected $actionDefault;
- /** @var array Map of non-terminals to a displacement into the $goto table. The corresponding goto state for this
- * non-terminal/state pair is $goto[$gotoBase[$nonTerminal] + $state] (unless defaulted) */
- protected $gotoBase;
- /** @var array Table of states to goto after reduction. Indexed according to $gotoBase comment. */
- protected $goto;
- /** @var array Table indexed analogously to $goto. If $gotoCheck[$gotoBase[$nonTerminal] + $state] != $nonTerminal
- * then the goto state is defaulted, i.e. $gotoDefault[$nonTerminal] should be used. */
- protected $gotoCheck;
- /** @var array Map of non-terminals to the default state to goto after their reduction */
- protected $gotoDefault;
- /** @var array Map of rules to the non-terminal on their left-hand side, i.e. the non-terminal to use for
- * determining the state to goto after reduction. */
- protected $ruleToNonTerminal;
- /** @var array Map of rules to the length of their right-hand side, which is the number of elements that have to
- * be popped from the stack(s) on reduction. */
- protected $ruleToLength;
- /*
- * The following members are part of the parser state:
- */
- /** @var Lexer Lexer that is used when parsing */
- protected $lexer;
- /** @var mixed Temporary value containing the result of last semantic action (reduction) */
- protected $semValue;
- /** @var int Position in stacks (state stack, semantic value stack, attribute stack) */
- protected $stackPos;
- /** @var array Semantic value stack (contains values of tokens and semantic action results) */
- protected $semStack;
- /** @var array[] Start attribute stack */
- protected $startAttributeStack;
- /** @var array[] End attribute stack */
- protected $endAttributeStack;
- /** @var array End attributes of last *shifted* token */
- protected $endAttributes;
- /** @var array Start attributes of last *read* token */
- protected $lookaheadStartAttributes;
- /** @var ErrorHandler Error handler */
- protected $errorHandler;
- /** @var Error[] Errors collected during last parse */
- protected $errors;
- /** @var int Error state, used to avoid error floods */
- protected $errorState;
- /**
- * Creates a parser instance.
- *
- * @param Lexer $lexer A lexer
- * @param array $options Options array. Currently no options are supported.
- */
- public function __construct(Lexer $lexer, array $options = array()) {
- $this->lexer = $lexer;
- $this->errors = array();
- if (isset($options['throwOnError'])) {
- throw new \LogicException(
- '"throwOnError" is no longer supported, use "errorHandler" instead');
- }
- }
- /**
- * Parses PHP code into a node tree.
- *
- * If a non-throwing error handler is used, the parser will continue parsing after an error
- * occurred and attempt to build a partial AST.
- *
- * @param string $code The source code to parse
- * @param ErrorHandler|null $errorHandler Error handler to use for lexer/parser errors, defaults
- * to ErrorHandler\Throwing.
- *
- * @return Node[]|null Array of statements (or null if the 'throwOnError' option is disabled and the parser was
- * unable to recover from an error).
- */
- public function parse($code, ErrorHandler $errorHandler = null) {
- $this->errorHandler = $errorHandler ?: new ErrorHandler\Throwing;
- // Initialize the lexer
- $this->lexer->startLexing($code, $this->errorHandler);
- // We start off with no lookahead-token
- $symbol = self::SYMBOL_NONE;
- // The attributes for a node are taken from the first and last token of the node.
- // From the first token only the startAttributes are taken and from the last only
- // the endAttributes. Both are merged using the array union operator (+).
- $startAttributes = '*POISON';
- $endAttributes = '*POISON';
- $this->endAttributes = $endAttributes;
- // Keep stack of start and end attributes
- $this->startAttributeStack = array();
- $this->endAttributeStack = array($endAttributes);
- // Start off in the initial state and keep a stack of previous states
- $state = 0;
- $stateStack = array($state);
- // Semantic value stack (contains values of tokens and semantic action results)
- $this->semStack = array();
- // Current position in the stack(s)
- $this->stackPos = 0;
- $this->errorState = 0;
- for (;;) {
- //$this->traceNewState($state, $symbol);
- if ($this->actionBase[$state] == 0) {
- $rule = $this->actionDefault[$state];
- } else {
- if ($symbol === self::SYMBOL_NONE) {
- // Fetch the next token id from the lexer and fetch additional info by-ref.
- // The end attributes are fetched into a temporary variable and only set once the token is really
- // shifted (not during read). Otherwise you would sometimes get off-by-one errors, when a rule is
- // reduced after a token was read but not yet shifted.
- $tokenId = $this->lexer->getNextToken($tokenValue, $startAttributes, $endAttributes);
- // map the lexer token id to the internally used symbols
- $symbol = $tokenId >= 0 && $tokenId < $this->tokenToSymbolMapSize
- ? $this->tokenToSymbol[$tokenId]
- : $this->invalidSymbol;
- if ($symbol === $this->invalidSymbol) {
- throw new \RangeException(sprintf(
- 'The lexer returned an invalid token (id=%d, value=%s)',
- $tokenId, $tokenValue
- ));
- }
- // This is necessary to assign some meaningful attributes to /* empty */ productions. They'll get
- // the attributes of the next token, even though they don't contain it themselves.
- $this->startAttributeStack[$this->stackPos+1] = $startAttributes;
- $this->endAttributeStack[$this->stackPos+1] = $endAttributes;
- $this->lookaheadStartAttributes = $startAttributes;
- //$this->traceRead($symbol);
- }
- $idx = $this->actionBase[$state] + $symbol;
- if ((($idx >= 0 && $idx < $this->actionTableSize && $this->actionCheck[$idx] == $symbol)
- || ($state < $this->YY2TBLSTATE
- && ($idx = $this->actionBase[$state + $this->YYNLSTATES] + $symbol) >= 0
- && $idx < $this->actionTableSize && $this->actionCheck[$idx] == $symbol))
- && ($action = $this->action[$idx]) != $this->defaultAction) {
- /*
- * >= YYNLSTATES: shift and reduce
- * > 0: shift
- * = 0: accept
- * < 0: reduce
- * = -YYUNEXPECTED: error
- */
- if ($action > 0) {
- /* shift */
- //$this->traceShift($symbol);
- ++$this->stackPos;
- $stateStack[$this->stackPos] = $state = $action;
- $this->semStack[$this->stackPos] = $tokenValue;
- $this->startAttributeStack[$this->stackPos] = $startAttributes;
- $this->endAttributeStack[$this->stackPos] = $endAttributes;
- $this->endAttributes = $endAttributes;
- $symbol = self::SYMBOL_NONE;
- if ($this->errorState) {
- --$this->errorState;
- }
- if ($action < $this->YYNLSTATES) {
- continue;
- }
- /* $yyn >= YYNLSTATES means shift-and-reduce */
- $rule = $action - $this->YYNLSTATES;
- } else {
- $rule = -$action;
- }
- } else {
- $rule = $this->actionDefault[$state];
- }
- }
- for (;;) {
- if ($rule === 0) {
- /* accept */
- //$this->traceAccept();
- return $this->semValue;
- } elseif ($rule !== $this->unexpectedTokenRule) {
- /* reduce */
- //$this->traceReduce($rule);
- try {
- $this->{'reduceRule' . $rule}();
- } catch (Error $e) {
- if (-1 === $e->getStartLine() && isset($startAttributes['startLine'])) {
- $e->setStartLine($startAttributes['startLine']);
- }
- $this->emitError($e);
- // Can't recover from this type of error
- return null;
- }
- /* Goto - shift nonterminal */
- $lastEndAttributes = $this->endAttributeStack[$this->stackPos];
- $this->stackPos -= $this->ruleToLength[$rule];
- $nonTerminal = $this->ruleToNonTerminal[$rule];
- $idx = $this->gotoBase[$nonTerminal] + $stateStack[$this->stackPos];
- if ($idx >= 0 && $idx < $this->gotoTableSize && $this->gotoCheck[$idx] == $nonTerminal) {
- $state = $this->goto[$idx];
- } else {
- $state = $this->gotoDefault[$nonTerminal];
- }
- ++$this->stackPos;
- $stateStack[$this->stackPos] = $state;
- $this->semStack[$this->stackPos] = $this->semValue;
- $this->endAttributeStack[$this->stackPos] = $lastEndAttributes;
- } else {
- /* error */
- switch ($this->errorState) {
- case 0:
- $msg = $this->getErrorMessage($symbol, $state);
- $this->emitError(new Error($msg, $startAttributes + $endAttributes));
- // Break missing intentionally
- case 1:
- case 2:
- $this->errorState = 3;
- // Pop until error-expecting state uncovered
- while (!(
- (($idx = $this->actionBase[$state] + $this->errorSymbol) >= 0
- && $idx < $this->actionTableSize && $this->actionCheck[$idx] == $this->errorSymbol)
- || ($state < $this->YY2TBLSTATE
- && ($idx = $this->actionBase[$state + $this->YYNLSTATES] + $this->errorSymbol) >= 0
- && $idx < $this->actionTableSize && $this->actionCheck[$idx] == $this->errorSymbol)
- ) || ($action = $this->action[$idx]) == $this->defaultAction) { // Not totally sure about this
- if ($this->stackPos <= 0) {
- // Could not recover from error
- return null;
- }
- $state = $stateStack[--$this->stackPos];
- //$this->tracePop($state);
- }
- //$this->traceShift($this->errorSymbol);
- ++$this->stackPos;
- $stateStack[$this->stackPos] = $state = $action;
- // We treat the error symbol as being empty, so we reset the end attributes
- // to the end attributes of the last non-error symbol
- $this->endAttributeStack[$this->stackPos] = $this->endAttributeStack[$this->stackPos - 1];
- $this->endAttributes = $this->endAttributeStack[$this->stackPos - 1];
- break;
- case 3:
- if ($symbol === 0) {
- // Reached EOF without recovering from error
- return null;
- }
- //$this->traceDiscard($symbol);
- $symbol = self::SYMBOL_NONE;
- break 2;
- }
- }
- if ($state < $this->YYNLSTATES) {
- break;
- }
- /* >= YYNLSTATES means shift-and-reduce */
- $rule = $state - $this->YYNLSTATES;
- }
- }
- throw new \RuntimeException('Reached end of parser loop');
- }
- protected function emitError(Error $error) {
- $this->errorHandler->handleError($error);
- }
- protected function getErrorMessage($symbol, $state) {
- $expectedString = '';
- if ($expected = $this->getExpectedTokens($state)) {
- $expectedString = ', expecting ' . implode(' or ', $expected);
- }
- return 'Syntax error, unexpected ' . $this->symbolToName[$symbol] . $expectedString;
- }
- protected function getExpectedTokens($state) {
- $expected = array();
- $base = $this->actionBase[$state];
- foreach ($this->symbolToName as $symbol => $name) {
- $idx = $base + $symbol;
- if ($idx >= 0 && $idx < $this->actionTableSize && $this->actionCheck[$idx] === $symbol
- || $state < $this->YY2TBLSTATE
- && ($idx = $this->actionBase[$state + $this->YYNLSTATES] + $symbol) >= 0
- && $idx < $this->actionTableSize && $this->actionCheck[$idx] === $symbol
- ) {
- if ($this->action[$idx] != $this->unexpectedTokenRule
- && $this->action[$idx] != $this->defaultAction
- && $symbol != $this->errorSymbol
- ) {
- if (count($expected) == 4) {
- /* Too many expected tokens */
- return array();
- }
- $expected[] = $name;
- }
- }
- }
- return $expected;
- }
- /*
- * Tracing functions used for debugging the parser.
- */
- /*
- protected function traceNewState($state, $symbol) {
- echo '% State ' . $state
- . ', Lookahead ' . ($symbol == self::SYMBOL_NONE ? '--none--' : $this->symbolToName[$symbol]) . "\n";
- }
- protected function traceRead($symbol) {
- echo '% Reading ' . $this->symbolToName[$symbol] . "\n";
- }
- protected function traceShift($symbol) {
- echo '% Shift ' . $this->symbolToName[$symbol] . "\n";
- }
- protected function traceAccept() {
- echo "% Accepted.\n";
- }
- protected function traceReduce($n) {
- echo '% Reduce by (' . $n . ') ' . $this->productions[$n] . "\n";
- }
- protected function tracePop($state) {
- echo '% Recovering, uncovered state ' . $state . "\n";
- }
- protected function traceDiscard($symbol) {
- echo '% Discard ' . $this->symbolToName[$symbol] . "\n";
- }
- */
- /*
- * Helper functions invoked by semantic actions
- */
- /**
- * Moves statements of semicolon-style namespaces into $ns->stmts and checks various error conditions.
- *
- * @param Node[] $stmts
- * @return Node[]
- */
- protected function handleNamespaces(array $stmts) {
- $hasErrored = false;
- $style = $this->getNamespacingStyle($stmts);
- if (null === $style) {
- // not namespaced, nothing to do
- return $stmts;
- } elseif ('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
- && $afterFirstNamespace && !$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 = array();
- $targetStmts =& $resultStmts;
- foreach ($stmts as $stmt) {
- if ($stmt instanceof Node\Stmt\Namespace_) {
- if ($stmt->stmts === null) {
- $stmt->stmts = array();
- $targetStmts =& $stmt->stmts;
- $resultStmts[] = $stmt;
- } else {
- // This handles the invalid case of mixed style namespaces
- $resultStmts[] = $stmt;
- $targetStmts =& $resultStmts;
- }
- } elseif ($stmt instanceof Node\Stmt\HaltCompiler) {
- // __halt_compiler() is not moved into the namespace
- $resultStmts[] = $stmt;
- } else {
- $targetStmts[] = $stmt;
- }
- }
- return $resultStmts;
- }
- }
- private function getNamespacingStyle(array $stmts) {
- $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',
- $stmt->getLine() // Avoid marking the entire namespace as an error
- ));
- }
- } elseif ($style !== $currentStyle) {
- $this->emitError(new Error(
- '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, $attributes);
- }
- }
- protected function parseNumString($str, $attributes) {
- if (!preg_match('/^(?:0|-?[1-9][0-9]*)$/', $str)) {
- return new String_($str, $attributes);
- }
- $num = +$str;
- if (!is_int($num)) {
- return new String_($str, $attributes);
- }
- return new LNumber($num, $attributes);
- }
- protected function checkModifier($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)
- ));
- }
- }
- }
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