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Edit File : ParserAbstract.php \| Size : 39.63 KB
<?php declare(strict_types=1); 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\Expr; use PhpParser\Node\Expr\Cast\Double; use PhpParser\Node\Name; use PhpParser\Node\Param; use PhpParser\Node\Scalar\Encapsed; 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; use PhpParser\Node\VarLikeIdentifier; 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; /* @var int Number of non-leaf states / protected $numNonLeafStates; /* @var int[] Map of lexer tokens to internal symbols / protected $tokenToSymbol; /* @var string[] Map of symbols to their names / protected $symbolToName; /* @var array Names of the production rules (only necessary for debugging) / protected $productions; /* @var int[] 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 int[] Table of actions. Indexed according to $actionBase comment. / protected $action; /* @var int[] 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 int[] Map of states to their default action / protected $actionDefault; /* @var callable[] Semantic action callbacks / protected $reduceCallbacks; /* @var int[] 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 int[] Table of states to goto after reduction. Indexed according to $gotoBase comment. / protected $goto; /* @var int[] 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 int[] Map of non-terminals to the default state to goto after their reduction / protected $gotoDefault; /* @var int[] 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 int[] 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 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 int Error state, used to avoid error floods / protected $errorState; /* * Initialize $reduceCallbacks map. / abstract protected function initReduceCallbacks(); /* * Creates a parser instance. * * Options: Currently none. * * @param Lexer $lexer A lexer * @param array $options Options array. / public function __construct(Lexer $lexer, array $options = []) { $this->lexer = $lexer; if (isset($options['throwOnError'])) { throw new \LogicException( '"throwOnError" is no longer supported, use "errorHandler" instead'); } $this->initReduceCallbacks(); } /* * 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\Stmt[]\|null Array of statements (or null non-throwing error handler is used and * the parser was unable to recover from an error). / public function parse(string $code, ErrorHandler $errorHandler = null) { $this->errorHandler = $errorHandler ?: new ErrorHandler\Throwing; $this->lexer->startLexing($code, $this->errorHandler); $result = $this->doParse(); // Clear out some of the interior state, so we don't hold onto unnecessary // memory between uses of the parser $this->startAttributeStack = []; $this->endAttributeStack = []; $this->semStack = []; $this->semValue = null; return $result; } protected function doParse() { // 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 = []; $endAttributes = []; $this->endAttributes = $endAttributes; // Keep stack of start and end attributes $this->startAttributeStack = []; $this->endAttributeStack = [$endAttributes]; // Start off in the initial state and keep a stack of previous states $state = 0; $stateStack = [$state]; // Semantic value stack (contains values of tokens and semantic action results) $this->semStack = []; // Current position in the stack(s) $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. $this->startAttributeStack[$stackPos+1] = $startAttributes; $this->endAttributeStack[$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->numNonLeafStates] + $symbol) >= 0 && $idx < $this->actionTableSize && $this->actionCheck[$idx] === $symbol)) && ($action = $this->action[$idx]) !== $this->defaultAction) { / * >= numNonLeafStates: shift and reduce * > 0: shift * = 0: accept * < 0: reduce * = -YYUNEXPECTED: error / if ($action > 0) { / shift / //$this->traceShift($symbol); ++$stackPos; $stateStack[$stackPos] = $state = $action; $this->semStack[$stackPos] = $tokenValue; $this->startAttributeStack[$stackPos] = $startAttributes; $this->endAttributeStack[$stackPos] = $endAttributes; $this->endAttributes = $endAttributes; $symbol = self::SYMBOL_NONE; if ($this->errorState) { --$this->errorState; } if ($action < $this->numNonLeafStates) { continue; } / $yyn >= numNonLeafStates means shift-and-reduce / $rule = $action - $this->numNonLeafStates; } 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 { $this->reduceCallbacks[$rule]($stackPos); } 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 = $this->endAttributeStack[$stackPos]; $stackPos -= $this->ruleToLength[$rule]; $nonTerminal = $this->ruleToNonTerminal[$rule]; $idx = $this->gotoBase[$nonTerminal] + $stateStack[$stackPos]; if ($idx >= 0 && $idx < $this->gotoTableSize && $this->gotoCheck[$idx] === $nonTerminal) { $state = $this->goto[$idx]; } else { $state = $this->gotoDefault[$nonTerminal]; } ++$stackPos; $stateStack[$stackPos] = $state; $this->semStack[$stackPos] = $this->semValue; $this->endAttributeStack[$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->numNonLeafStates] + $this->errorSymbol) >= 0 && $idx < $this->actionTableSize && $this->actionCheck[$idx] === $this->errorSymbol) ) \|\| ($action = $this->action[$idx]) === $this->defaultAction) { // Not totally sure about this if ($stackPos <= 0) { // Could not recover from error return null; } $state = $stateStack[--$stackPos]; //$this->tracePop($state); } //$this->traceShift($this->errorSymbol); ++$stackPos; $stateStack[$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 $this->endAttributeStack[$stackPos] = $this->endAttributeStack[$stackPos - 1]; $this->endAttributes = $this->endAttributeStack[$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->numNonLeafStates) { break; } / >= numNonLeafStates means shift-and-reduce / $rule = $state - $this->numNonLeafStates; } } throw new \RuntimeException('Reached end of parser loop'); } protected function emitError(Error $error) { $this->errorHandler->handleError($error); } /* * Format error message including expected tokens. * * @param int $symbol Unexpected symbol * @param int $state State at time of error * * @return string Formatted error message / protected function getErrorMessage(int $symbol, int $state) : string { $expectedString = ''; if ($expected = $this->getExpectedTokens($state)) { $expectedString = ', expecting ' . implode(' or ', $expected); } return 'Syntax error, unexpected ' . $this->symbolToName[$symbol] . $expectedString; } /* * Get limited number of expected tokens in given state. * * @param int $state State * * @return string[] Expected tokens. If too many, an empty array is returned. / protected function getExpectedTokens(int $state) : array { $expected = []; $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->numNonLeafStates] + $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 []; } $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\Stmt[] $stmts * @return Node\Stmt[] / protected function handleNamespaces(array $stmts) : array { $hasErrored = false; $style = $this->getNamespacingStyle($stmts); if (null === $style) { // not namespaced, nothing to do return $stmts; } 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 && !$stmt instanceof Node\Stmt\Nop && $afterFirstNamespace && !$hasErrored) { $this->emitError(new Error( 'No code may exist outside of namespace {}', $stmt->getAttributes())); $hasErrored = true; // Avoid one error for every statement } } return $stmts; } else { // For semicolon namespaces we have to move the statements after a namespace declaration into ->stmts $resultStmts = []; $targetStmts =& $resultStmts; $lastNs = null; foreach ($stmts as $stmt) { if ($stmt instanceof Node\Stmt\Namespace_) { if ($lastNs !== null) { $this->fixupNamespaceAttributes($lastNs); } if ($stmt->stmts === null) { $stmt->stmts = []; $targetStmts =& $stmt->stmts; $resultStmts[] = $stmt; } else { // This handles the invalid case of mixed style namespaces $resultStmts[] = $stmt; $targetStmts =& $resultStmts; } $lastNs = $stmt; } elseif ($stmt instanceof Node\Stmt\HaltCompiler) { // __halt_compiler() is not moved into the namespace $resultStmts[] = $stmt; } else { $targetStmts[] = $stmt; } } if ($lastNs !== null) { $this->fixupNamespaceAttributes($lastNs); } return $resultStmts; } } private function fixupNamespaceAttributes(Node\Stmt\Namespace_ $stmt) { // We moved the statements into the namespace node, as such the end of the namespace node // needs to be extended to the end of the statements. if (empty($stmt->stmts)) { return; } // We only move the builtin end attributes here. This is the best we can do with the // knowledge we have. $endAttributes = ['endLine', 'endFilePos', 'endTokenPos']; $lastStmt = $stmt->stmts[count($stmt->stmts) - 1]; foreach ($endAttributes as $endAttribute) { if ($lastStmt->hasAttribute($endAttribute)) { $stmt->setAttribute($endAttribute, $lastStmt->getAttribute($endAttribute)); } } } /* * Determine namespacing style (semicolon or brace) * * @param Node[] $stmts Top-level statements. * * @return null\|string One of "semicolon", "brace" or null (no namespaces) / private function getNamespacingStyle(array $stmts) { $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 $style; } /* * Fix up parsing of static property calls in PHP 5. * * In PHP 5 A::$b[c][d] and A::$b[c][d]() have very different interpretation. The former is * interpreted as (A::$b)[c][d], while the latter is the same as A::{$b[c][d]}(). We parse the * latter as the former initially and this method fixes the AST into the correct form when we * encounter the "()". * * @param Node\Expr\StaticPropertyFetch\|Node\Expr\ArrayDimFetch $prop * @param Node\Arg[] $args * @param array $attributes * * @return Expr\StaticCall / protected function fixupPhp5StaticPropCall($prop, array $args, array $attributes) : Expr\StaticCall { if ($prop instanceof Node\Expr\StaticPropertyFetch) { $name = $prop->name instanceof VarLikeIdentifier ? $prop->name->toString() : $prop->name; $var = new Expr\Variable($name, $prop->name->getAttributes()); return new Expr\StaticCall($prop->class, $var, $args, $attributes); } elseif ($prop instanceof Node\Expr\ArrayDimFetch) { $tmp = $prop; while ($tmp->var instanceof Node\Expr\ArrayDimFetch) { $tmp = $tmp->var; } /* @var Expr\StaticPropertyFetch $staticProp / $staticProp = $tmp->var; // Set start attributes to attributes of innermost node $tmp = $prop; $this->fixupStartAttributes($tmp, $staticProp->name); while ($tmp->var instanceof Node\Expr\ArrayDimFetch) { $tmp = $tmp->var; $this->fixupStartAttributes($tmp, $staticProp->name); } $name = $staticProp->name instanceof VarLikeIdentifier ? $staticProp->name->toString() : $staticProp->name; $tmp->var = new Expr\Variable($name, $staticProp->name->getAttributes()); return new Expr\StaticCall($staticProp->class, $prop, $args, $attributes); } else { throw new \Exception; } } protected function fixupStartAttributes(Node $to, Node $from) { $startAttributes = ['startLine', 'startFilePos', 'startTokenPos']; foreach ($startAttributes as $startAttribute) { if ($from->hasAttribute($startAttribute)) { $to->setAttribute($startAttribute, $from->getAttribute($startAttribute)); } } } protected function handleBuiltinTypes(Name $name) { $scalarTypes = [ 'bool' => true, 'int' => true, 'float' => true, 'string' => true, 'iterable' => true, 'void' => true, 'object' => true, 'null' => true, 'false' => true, ]; if (!$name->isUnqualified()) { return $name; } $lowerName = $name->toLowerString(); if (!isset($scalarTypes[$lowerName])) { return $name; } return new Node\Identifier($lowerName, $name->getAttributes()); } /* * Get combined start and end attributes at a stack location * * @param int $pos Stack location * * @return array Combined start and end attributes / protected function getAttributesAt(int $pos) : array { return $this->startAttributeStack[$pos] + $this->endAttributeStack[$pos]; } protected function getFloatCastKind(string $cast): int { $cast = strtolower($cast); if (strpos($cast, 'float') !== false) { return Double::KIND_FLOAT; } if (strpos($cast, 'real') !== false) { return Double::KIND_REAL; } return Double::KIND_DOUBLE; } 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); } } /* * Parse a T_NUM_STRING token into either an integer or string node. * * @param string $str Number string * @param array $attributes Attributes * * @return LNumber\|String_ Integer or string node. / protected function parseNumString(string $str, array $attributes) { if (!preg_match('/^(?:0\|-?[1-9][0-9])$/', $str)) { return new String_($str, $attributes); } $num = +$str; if (!is_int($num)) { return new String_($str, $attributes); } return new LNumber($num, $attributes); } protected function stripIndentation( string $string, int $indentLen, string $indentChar, bool $newlineAtStart, bool $newlineAtEnd, array $attributes ) { if ($indentLen === 0) { return $string; } $start = $newlineAtStart ? '(?:(?<=\n)\|\A)' : '(?<=\n)'; $end = $newlineAtEnd ? '(?:(?=[\r\n])\|\z)' : '(?=[\r\n])'; $regex = '/' . $start . '([ \t])(' . $end . ')?/'; return preg_replace_callback( $regex, function ($matches) use ($indentLen, $indentChar, $attributes) { $prefix = substr($matches[1], 0, $indentLen); if (false !== strpos($prefix, $indentChar === " " ? "\t" : " ")) { $this->emitError(new Error( 'Invalid indentation - tabs and spaces cannot be mixed', $attributes )); } elseif (strlen($prefix) < $indentLen && !isset($matches[2])) { $this->emitError(new Error( 'Invalid body indentation level ' . '(expecting an indentation level of at least ' . $indentLen . ')', $attributes )); } return substr($matches[0], strlen($prefix)); }, $string ); } protected function parseDocString( string $startToken, $contents, string $endToken, array $attributes, array $endTokenAttributes, bool $parseUnicodeEscape ) { $kind = strpos($startToken, "'") === false ? String_::KIND_HEREDOC : String_::KIND_NOWDOC; $regex = '/\A[bB]?<<<[ \t][\'"]?([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff])[\'"]?(?:\r\n\|\n\|\r)\z/'; $result = preg_match($regex, $startToken, $matches); assert($result === 1); $label = $matches[1]; $result = preg_match('/\A[ \t]/', $endToken, $matches); assert($result === 1); $indentation = $matches[0]; $attributes['kind'] = $kind; $attributes['docLabel'] = $label; $attributes['docIndentation'] = $indentation; $indentHasSpaces = false !== strpos($indentation, " "); $indentHasTabs = false !== strpos($indentation, "\t"); if ($indentHasSpaces && $indentHasTabs) { $this->emitError(new Error( 'Invalid indentation - tabs and spaces cannot be mixed', $endTokenAttributes )); // Proceed processing as if this doc string is not indented $indentation = ''; } $indentLen = \strlen($indentation); $indentChar = $indentHasSpaces ? " " : "\t"; if (\is_string($contents)) { if ($contents === '') { return new String_('', $attributes); } $contents = $this->stripIndentation( $contents, $indentLen, $indentChar, true, true, $attributes ); $contents = preg_replace('~(\r\n\|\n\|\r)\z~', '', $contents); if ($kind === String_::KIND_HEREDOC) { $contents = String_::parseEscapeSequences($contents, null, $parseUnicodeEscape); } return new String_($contents, $attributes); } else { assert(count($contents) > 0); if (!$contents[0] instanceof Node\Scalar\EncapsedStringPart) { // If there is no leading encapsed string part, pretend there is an empty one $this->stripIndentation( '', $indentLen, $indentChar, true, false, $contents[0]->getAttributes() ); } $newContents = []; foreach ($contents as $i => $part) { if ($part instanceof Node\Scalar\EncapsedStringPart) { $isLast = $i === \count($contents) - 1; $part->value = $this->stripIndentation( $part->value, $indentLen, $indentChar, $i === 0, $isLast, $part->getAttributes() ); $part->value = String_::parseEscapeSequences($part->value, null, $parseUnicodeEscape); if ($isLast) { $part->value = preg_replace('~(\r\n\|\n\|\r)\z~', '', $part->value); } if ('' === $part->value) { continue; } } $newContents[] = $part; } return new Encapsed($newContents, $attributes); } } /** * Create attributes for a zero-length node with the given start attributes. * * @param array $startAttributes * @return array */ protected function createZeroLengthAttributes(array $startAttributes) { $attributes = $startAttributes; if (isset($startAttributes['startLine'])) { $attributes['endLine'] = $startAttributes['startLine']; } if (isset($startAttributes['startTokenPos'])) { $attributes['endTokenPos'] = $startAttributes['startTokenPos'] - 1; } if (isset($startAttributes['startFilePos'])) { $attributes['endFilePos'] = $startAttributes['startFilePos'] - 1; } return $attributes; } protected function checkModifier($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_ $node) { if ($node->name && $node->name->isSpecialClassName()) { $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 && $node->name->isSpecialClassName()) { $this->emitError(new Error( sprintf('Cannot use \'%s\' as class name as it is reserved', $node->name), $this->getAttributesAt($namePos) )); } if ($node->extends && $node->extends->isSpecialClassName()) { $this->emitError(new Error( sprintf('Cannot use \'%s\' as class name as it is reserved', $node->extends), $node->extends->getAttributes() )); } foreach ($node->implements as $interface) { if ($interface->isSpecialClassName()) { $this->emitError(new Error( sprintf('Cannot use \'%s\' as interface name as it is reserved', $interface), $interface->getAttributes() )); } } } protected function checkInterface(Interface_ $node, $namePos) { if (null !== $node->name && $node->name->isSpecialClassName()) { $this->emitError(new Error( sprintf('Cannot use \'%s\' as class name as it is reserved', $node->name), $this->getAttributesAt($namePos) )); } foreach ($node->extends as $interface) { if ($interface->isSpecialClassName()) { $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 ($node->name->toLowerString()) { case '__construct': $this->emitError(new Error( sprintf('Constructor %s() cannot be static', $node->name), $this->getAttributesAt($modifierPos))); break; case '__destruct': $this->emitError(new Error( sprintf('Destructor %s() cannot be static', $node->name), $this->getAttributesAt($modifierPos))); break; case '__clone': $this->emitError(new Error( sprintf('Clone method %s() cannot be static', $node->name), $this->getAttributesAt($modifierPos))); break; } } } 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, $namePos) { if ($node->alias && $node->alias->isSpecialClassName()) { $this->emitError(new Error( sprintf( 'Cannot use %s as %s because \'%2$s\' is a special class name', $node->name, $node->alias ), $this->getAttributesAt($namePos) )); } } } Back

Edit File : ParserAbstract.php | Size : 39.63 KB

<?php declare(strict_types=1);

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\Expr;
use PhpParser\Node\Expr\Cast\Double;
use PhpParser\Node\Name;
use PhpParser\Node\Param;
use PhpParser\Node\Scalar\Encapsed;
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;
use PhpParser\Node\VarLikeIdentifier;

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;
    /** @var int Number of non-leaf states */
    protected $numNonLeafStates;

/** @var int[] Map of lexer tokens to internal symbols */
    protected $tokenToSymbol;
    /** @var string[] Map of symbols to their names */
    protected $symbolToName;
    /** @var array Names of the production rules (only necessary for debugging) */
    protected $productions;

/** @var int[] 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 int[] Table of actions. Indexed according to $actionBase comment. */
    protected $action;
    /** @var int[] 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 int[] Map of states to their default action */
    protected $actionDefault;
    /** @var callable[] Semantic action callbacks */
    protected $reduceCallbacks;

/** @var int[] 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 int[] Table of states to goto after reduction. Indexed according to $gotoBase comment. */
    protected $goto;
    /** @var int[] 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 int[] Map of non-terminals to the default state to goto after their reduction */
    protected $gotoDefault;

/** @var int[] 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 int[] 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 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 int Error state, used to avoid error floods */
    protected $errorState;

/**
     * Initialize $reduceCallbacks map.
     */
    abstract protected function initReduceCallbacks();

/**
     * Creates a parser instance.
     *
     * Options: Currently none.
     *
     * @param Lexer $lexer A lexer
     * @param array $options Options array.
     */
    public function __construct(Lexer $lexer, array $options = []) {
        $this->lexer = $lexer;

if (isset($options['throwOnError'])) {
            throw new \LogicException(
                '"throwOnError" is no longer supported, use "errorHandler" instead');
        }

$this->initReduceCallbacks();
    }

/**
     * 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\Stmt[]|null Array of statements (or null non-throwing error handler is used and
     *                          the parser was unable to recover from an error).
     */
    public function parse(string $code, ErrorHandler $errorHandler = null) {
        $this->errorHandler = $errorHandler ?: new ErrorHandler\Throwing;

$this->lexer->startLexing($code, $this->errorHandler);
        $result = $this->doParse();

// Clear out some of the interior state, so we don't hold onto unnecessary
        // memory between uses of the parser
        $this->startAttributeStack = [];
        $this->endAttributeStack = [];
        $this->semStack = [];
        $this->semValue = null;

return $result;
    }

protected function doParse() {
        // 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 = [];
        $endAttributes = [];
        $this->endAttributes = $endAttributes;

// Keep stack of start and end attributes
        $this->startAttributeStack = [];
        $this->endAttributeStack = [$endAttributes];

// Start off in the initial state and keep a stack of previous states
        $state = 0;
        $stateStack = [$state];

// Semantic value stack (contains values of tokens and semantic action results)
        $this->semStack = [];

// Current position in the stack(s)
        $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.
                    $this->startAttributeStack[$stackPos+1] = $startAttributes;
                    $this->endAttributeStack[$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->numNonLeafStates] + $symbol) >= 0
                         && $idx < $this->actionTableSize && $this->actionCheck[$idx] === $symbol))
                    && ($action = $this->action[$idx]) !== $this->defaultAction) {
                    /*
                     * >= numNonLeafStates: shift and reduce
                     * > 0: shift
                     * = 0: accept
                     * < 0: reduce
                     * = -YYUNEXPECTED: error
                     */
                    if ($action > 0) {
                        /* shift */
                        //$this->traceShift($symbol);

++$stackPos;
                        $stateStack[$stackPos] = $state = $action;
                        $this->semStack[$stackPos] = $tokenValue;
                        $this->startAttributeStack[$stackPos] = $startAttributes;
                        $this->endAttributeStack[$stackPos] = $endAttributes;
                        $this->endAttributes = $endAttributes;
                        $symbol = self::SYMBOL_NONE;

if ($this->errorState) {
                            --$this->errorState;
                        }

if ($action < $this->numNonLeafStates) {
                            continue;
                        }

/* $yyn >= numNonLeafStates means shift-and-reduce */
                        $rule = $action - $this->numNonLeafStates;
                    } 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 {
                        $this->reduceCallbacks[$rule]($stackPos);
                    } 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 = $this->endAttributeStack[$stackPos];
                    $stackPos -= $this->ruleToLength[$rule];
                    $nonTerminal = $this->ruleToNonTerminal[$rule];
                    $idx = $this->gotoBase[$nonTerminal] + $stateStack[$stackPos];
                    if ($idx >= 0 && $idx < $this->gotoTableSize && $this->gotoCheck[$idx] === $nonTerminal) {
                        $state = $this->goto[$idx];
                    } else {
                        $state = $this->gotoDefault[$nonTerminal];
                    }

++$stackPos;
                    $stateStack[$stackPos]     = $state;
                    $this->semStack[$stackPos] = $this->semValue;
                    $this->endAttributeStack[$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->numNonLeafStates] + $this->errorSymbol) >= 0
                                    && $idx < $this->actionTableSize && $this->actionCheck[$idx] === $this->errorSymbol)
                            ) || ($action = $this->action[$idx]) === $this->defaultAction) { // Not totally sure about this
                                if ($stackPos <= 0) {
                                    // Could not recover from error
                                    return null;
                                }
                                $state = $stateStack[--$stackPos];
                                //$this->tracePop($state);
                            }

//$this->traceShift($this->errorSymbol);
                            ++$stackPos;
                            $stateStack[$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
                            $this->endAttributeStack[$stackPos] = $this->endAttributeStack[$stackPos - 1];
                            $this->endAttributes = $this->endAttributeStack[$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->numNonLeafStates) {
                    break;
                }

/* >= numNonLeafStates means shift-and-reduce */
                $rule = $state - $this->numNonLeafStates;
            }
        }

throw new \RuntimeException('Reached end of parser loop');
    }

protected function emitError(Error $error) {
        $this->errorHandler->handleError($error);
    }

/**
     * Format error message including expected tokens.
     *
     * @param int $symbol Unexpected symbol
     * @param int $state  State at time of error
     *
     * @return string Formatted error message
     */
    protected function getErrorMessage(int $symbol, int $state) : string {
        $expectedString = '';
        if ($expected = $this->getExpectedTokens($state)) {
            $expectedString = ', expecting ' . implode(' or ', $expected);
        }

return 'Syntax error, unexpected ' . $this->symbolToName[$symbol] . $expectedString;
    }

/**
     * Get limited number of expected tokens in given state.
     *
     * @param int $state State
     *
     * @return string[] Expected tokens. If too many, an empty array is returned.
     */
    protected function getExpectedTokens(int $state) : array {
        $expected = [];

$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->numNonLeafStates] + $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 [];
                    }

$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\Stmt[] $stmts
     * @return Node\Stmt[]
     */
    protected function handleNamespaces(array $stmts) : array {
        $hasErrored = false;
        $style = $this->getNamespacingStyle($stmts);
        if (null === $style) {
            // not namespaced, nothing to do
            return $stmts;
        } 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
                        && !$stmt instanceof Node\Stmt\Nop
                        && $afterFirstNamespace && !$hasErrored) {
                    $this->emitError(new Error(
                        'No code may exist outside of namespace {}', $stmt->getAttributes()));
                    $hasErrored = true; // Avoid one error for every statement
                }
            }
            return $stmts;
        } else {
            // For semicolon namespaces we have to move the statements after a namespace declaration into ->stmts
            $resultStmts = [];
            $targetStmts =& $resultStmts;
            $lastNs = null;
            foreach ($stmts as $stmt) {
                if ($stmt instanceof Node\Stmt\Namespace_) {
                    if ($lastNs !== null) {
                        $this->fixupNamespaceAttributes($lastNs);
                    }
                    if ($stmt->stmts === null) {
                        $stmt->stmts = [];
                        $targetStmts =& $stmt->stmts;
                        $resultStmts[] = $stmt;
                    } else {
                        // This handles the invalid case of mixed style namespaces
                        $resultStmts[] = $stmt;
                        $targetStmts =& $resultStmts;
                    }
                    $lastNs = $stmt;
                } elseif ($stmt instanceof Node\Stmt\HaltCompiler) {
                    // __halt_compiler() is not moved into the namespace
                    $resultStmts[] = $stmt;
                } else {
                    $targetStmts[] = $stmt;
                }
            }
            if ($lastNs !== null) {
                $this->fixupNamespaceAttributes($lastNs);
            }
            return $resultStmts;
        }
    }

private function fixupNamespaceAttributes(Node\Stmt\Namespace_ $stmt) {
        // We moved the statements into the namespace node, as such the end of the namespace node
        // needs to be extended to the end of the statements.
        if (empty($stmt->stmts)) {
            return;
        }

// We only move the builtin end attributes here. This is the best we can do with the
        // knowledge we have.
        $endAttributes = ['endLine', 'endFilePos', 'endTokenPos'];
        $lastStmt = $stmt->stmts[count($stmt->stmts) - 1];
        foreach ($endAttributes as $endAttribute) {
            if ($lastStmt->hasAttribute($endAttribute)) {
                $stmt->setAttribute($endAttribute, $lastStmt->getAttribute($endAttribute));
            }
        }
    }

/**
     * Determine namespacing style (semicolon or brace)
     *
     * @param Node[] $stmts Top-level statements.
     *
     * @return null|string One of "semicolon", "brace" or null (no namespaces)
     */
    private function getNamespacingStyle(array $stmts) {
        $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;
    }

/**
     * Fix up parsing of static property calls in PHP 5.
     *
     * In PHP 5 A::$b[c][d] and A::$b[c][d]() have very different interpretation. The former is
     * interpreted as (A::$b)[c][d], while the latter is the same as A::{$b[c][d]}(). We parse the
     * latter as the former initially and this method fixes the AST into the correct form when we
     * encounter the "()".
     *
     * @param  Node\Expr\StaticPropertyFetch|Node\Expr\ArrayDimFetch $prop
     * @param  Node\Arg[] $args
     * @param  array      $attributes
     *
     * @return Expr\StaticCall
     */
    protected function fixupPhp5StaticPropCall($prop, array $args, array $attributes) : Expr\StaticCall {
        if ($prop instanceof Node\Expr\StaticPropertyFetch) {
            $name = $prop->name instanceof VarLikeIdentifier
                ? $prop->name->toString() : $prop->name;
            $var = new Expr\Variable($name, $prop->name->getAttributes());
            return new Expr\StaticCall($prop->class, $var, $args, $attributes);
        } elseif ($prop instanceof Node\Expr\ArrayDimFetch) {
            $tmp = $prop;
            while ($tmp->var instanceof Node\Expr\ArrayDimFetch) {
                $tmp = $tmp->var;
            }

/** @var Expr\StaticPropertyFetch $staticProp */
            $staticProp = $tmp->var;

// Set start attributes to attributes of innermost node
            $tmp = $prop;
            $this->fixupStartAttributes($tmp, $staticProp->name);
            while ($tmp->var instanceof Node\Expr\ArrayDimFetch) {
                $tmp = $tmp->var;
                $this->fixupStartAttributes($tmp, $staticProp->name);
            }

$name = $staticProp->name instanceof VarLikeIdentifier
                ? $staticProp->name->toString() : $staticProp->name;
            $tmp->var = new Expr\Variable($name, $staticProp->name->getAttributes());
            return new Expr\StaticCall($staticProp->class, $prop, $args, $attributes);
        } else {
            throw new \Exception;
        }
    }

protected function fixupStartAttributes(Node $to, Node $from) {
        $startAttributes = ['startLine', 'startFilePos', 'startTokenPos'];
        foreach ($startAttributes as $startAttribute) {
            if ($from->hasAttribute($startAttribute)) {
                $to->setAttribute($startAttribute, $from->getAttribute($startAttribute));
            }
        }
    }

protected function handleBuiltinTypes(Name $name) {
        $scalarTypes = [
            'bool'     => true,
            'int'      => true,
            'float'    => true,
            'string'   => true,
            'iterable' => true,
            'void'     => true,
            'object'   => true,
            'null'     => true,
            'false'    => true,
        ];

if (!$name->isUnqualified()) {
            return $name;
        }

$lowerName = $name->toLowerString();
        if (!isset($scalarTypes[$lowerName])) {
            return $name;
        }

return new Node\Identifier($lowerName, $name->getAttributes());
    }

/**
     * Get combined start and end attributes at a stack location
     *
     * @param int $pos Stack location
     *
     * @return array Combined start and end attributes
     */
    protected function getAttributesAt(int $pos) : array {
        return $this->startAttributeStack[$pos] + $this->endAttributeStack[$pos];
    }

protected function getFloatCastKind(string $cast): int
    {
        $cast = strtolower($cast);
        if (strpos($cast, 'float') !== false) {
            return Double::KIND_FLOAT;
        }

if (strpos($cast, 'real') !== false) {
            return Double::KIND_REAL;
        }

return Double::KIND_DOUBLE;
    }

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);
        }
    }

/**
     * Parse a T_NUM_STRING token into either an integer or string node.
     *
     * @param string $str        Number string
     * @param array  $attributes Attributes
     *
     * @return LNumber|String_ Integer or string node.
     */
    protected function parseNumString(string $str, array $attributes) {
        if (!preg_match('/^(?:0|-?[1-9][0-9]*)$/', $str)) {
            return new String_($str, $attributes);
        }

$num = +$str;
        if (!is_int($num)) {
            return new String_($str, $attributes);
        }

return new LNumber($num, $attributes);
    }

protected function stripIndentation(
        string $string, int $indentLen, string $indentChar,
        bool $newlineAtStart, bool $newlineAtEnd, array $attributes
    ) {
        if ($indentLen === 0) {
            return $string;
        }

$start = $newlineAtStart ? '(?:(?<=\n)|\A)' : '(?<=\n)';
        $end = $newlineAtEnd ? '(?:(?=[\r\n])|\z)' : '(?=[\r\n])';
        $regex = '/' . $start . '([ \t]*)(' . $end . ')?/';
        return preg_replace_callback(
            $regex,
            function ($matches) use ($indentLen, $indentChar, $attributes) {
                $prefix = substr($matches[1], 0, $indentLen);
                if (false !== strpos($prefix, $indentChar === " " ? "\t" : " ")) {
                    $this->emitError(new Error(
                        'Invalid indentation - tabs and spaces cannot be mixed', $attributes
                    ));
                } elseif (strlen($prefix) < $indentLen && !isset($matches[2])) {
                    $this->emitError(new Error(
                        'Invalid body indentation level ' .
                        '(expecting an indentation level of at least ' . $indentLen . ')',
                        $attributes
                    ));
                }
                return substr($matches[0], strlen($prefix));
            },
            $string
        );
    }

protected function parseDocString(
        string $startToken, $contents, string $endToken,
        array $attributes, array $endTokenAttributes, bool $parseUnicodeEscape
    ) {
        $kind = strpos($startToken, "'") === false
            ? String_::KIND_HEREDOC : String_::KIND_NOWDOC;

$regex = '/\A[bB]?<<<[ \t]*[\'"]?([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)[\'"]?(?:\r\n|\n|\r)\z/';
        $result = preg_match($regex, $startToken, $matches);
        assert($result === 1);
        $label = $matches[1];

$result = preg_match('/\A[ \t]*/', $endToken, $matches);
        assert($result === 1);
        $indentation = $matches[0];

$attributes['kind'] = $kind;
        $attributes['docLabel'] = $label;
        $attributes['docIndentation'] = $indentation;

$indentHasSpaces = false !== strpos($indentation, " ");
        $indentHasTabs = false !== strpos($indentation, "\t");
        if ($indentHasSpaces && $indentHasTabs) {
            $this->emitError(new Error(
                'Invalid indentation - tabs and spaces cannot be mixed',
                $endTokenAttributes
            ));

// Proceed processing as if this doc string is not indented
            $indentation = '';
        }

$indentLen = \strlen($indentation);
        $indentChar = $indentHasSpaces ? " " : "\t";

if (\is_string($contents)) {
            if ($contents === '') {
                return new String_('', $attributes);
            }

$contents = $this->stripIndentation(
                $contents, $indentLen, $indentChar, true, true, $attributes
            );
            $contents = preg_replace('~(\r\n|\n|\r)\z~', '', $contents);

if ($kind === String_::KIND_HEREDOC) {
                $contents = String_::parseEscapeSequences($contents, null, $parseUnicodeEscape);
            }

return new String_($contents, $attributes);
        } else {
            assert(count($contents) > 0);
            if (!$contents[0] instanceof Node\Scalar\EncapsedStringPart) {
                // If there is no leading encapsed string part, pretend there is an empty one
                $this->stripIndentation(
                    '', $indentLen, $indentChar, true, false, $contents[0]->getAttributes()
                );
            }

$newContents = [];
            foreach ($contents as $i => $part) {
                if ($part instanceof Node\Scalar\EncapsedStringPart) {
                    $isLast = $i === \count($contents) - 1;
                    $part->value = $this->stripIndentation(
                        $part->value, $indentLen, $indentChar,
                        $i === 0, $isLast, $part->getAttributes()
                    );
                    $part->value = String_::parseEscapeSequences($part->value, null, $parseUnicodeEscape);
                    if ($isLast) {
                        $part->value = preg_replace('~(\r\n|\n|\r)\z~', '', $part->value);
                    }
                    if ('' === $part->value) {
                        continue;
                    }
                }
                $newContents[] = $part;
            }
            return new Encapsed($newContents, $attributes);
        }
    }

/**
     * Create attributes for a zero-length node with the given start attributes.
     *
     * @param array $startAttributes
     * @return array
     */
    protected function createZeroLengthAttributes(array $startAttributes) {
        $attributes = $startAttributes;
        if (isset($startAttributes['startLine'])) {
            $attributes['endLine'] = $startAttributes['startLine'];
        }
        if (isset($startAttributes['startTokenPos'])) {
            $attributes['endTokenPos'] = $startAttributes['startTokenPos'] - 1;
        }
        if (isset($startAttributes['startFilePos'])) {
            $attributes['endFilePos'] = $startAttributes['startFilePos'] - 1;
        }
        return $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_ $node) {
        if ($node->name && $node->name->isSpecialClassName()) {
            $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 && $node->name->isSpecialClassName()) {
            $this->emitError(new Error(
                sprintf('Cannot use \'%s\' as class name as it is reserved', $node->name),
                $this->getAttributesAt($namePos)
            ));
        }

if ($node->extends && $node->extends->isSpecialClassName()) {
            $this->emitError(new Error(
                sprintf('Cannot use \'%s\' as class name as it is reserved', $node->extends),
                $node->extends->getAttributes()
            ));
        }

foreach ($node->implements as $interface) {
            if ($interface->isSpecialClassName()) {
                $this->emitError(new Error(
                    sprintf('Cannot use \'%s\' as interface name as it is reserved', $interface),
                    $interface->getAttributes()
                ));
            }
        }
    }

protected function checkInterface(Interface_ $node, $namePos) {
        if (null !== $node->name && $node->name->isSpecialClassName()) {
            $this->emitError(new Error(
                sprintf('Cannot use \'%s\' as class name as it is reserved', $node->name),
                $this->getAttributesAt($namePos)
            ));
        }

foreach ($node->extends as $interface) {
            if ($interface->isSpecialClassName()) {
                $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 ($node->name->toLowerString()) {
                case '__construct':
                    $this->emitError(new Error(
                        sprintf('Constructor %s() cannot be static', $node->name),
                        $this->getAttributesAt($modifierPos)));
                    break;
                case '__destruct':
                    $this->emitError(new Error(
                        sprintf('Destructor %s() cannot be static', $node->name),
                        $this->getAttributesAt($modifierPos)));
                    break;
                case '__clone':
                    $this->emitError(new Error(
                        sprintf('Clone method %s() cannot be static', $node->name),
                        $this->getAttributesAt($modifierPos)));
                    break;
            }
        }
    }

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, $namePos) {
        if ($node->alias && $node->alias->isSpecialClassName()) {
            $this->emitError(new Error(
                sprintf(
                    'Cannot use %s as %s because \'%2$s\' is a special class name',
                    $node->name, $node->alias
                ),
                $this->getAttributesAt($namePos)
            ));
        }
    }
}

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