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250
vendor/nikic/php-parser/lib/PhpParser/Lexer/Emulative.php
vendored
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250
vendor/nikic/php-parser/lib/PhpParser/Lexer/Emulative.php
vendored
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<?php declare(strict_types=1);
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namespace PhpParser\Lexer;
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use PhpParser\Error;
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use PhpParser\ErrorHandler;
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use PhpParser\Lexer;
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use PhpParser\Lexer\TokenEmulator\CoaleseEqualTokenEmulator;
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use PhpParser\Lexer\TokenEmulator\FnTokenEmulator;
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use PhpParser\Lexer\TokenEmulator\NumericLiteralSeparatorEmulator;
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use PhpParser\Lexer\TokenEmulator\TokenEmulatorInterface;
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use PhpParser\Parser\Tokens;
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class Emulative extends Lexer
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{
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const PHP_7_3 = '7.3.0dev';
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const PHP_7_4 = '7.4.0dev';
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const T_COALESCE_EQUAL = 1007;
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const T_FN = 1008;
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const FLEXIBLE_DOC_STRING_REGEX = <<<'REGEX'
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/<<<[ \t]*(['"]?)([a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*)\1\r?\n
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(?:.*\r?\n)*?
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(?<indentation>\h*)\2(?![a-zA-Z0-9_\x80-\xff])(?<separator>(?:;?[\r\n])?)/x
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REGEX;
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/** @var mixed[] Patches used to reverse changes introduced in the code */
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private $patches = [];
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/** @var TokenEmulatorInterface[] */
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private $tokenEmulators = [];
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/**
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* @param mixed[] $options
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*/
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public function __construct(array $options = [])
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{
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parent::__construct($options);
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$this->tokenEmulators[] = new FnTokenEmulator();
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$this->tokenEmulators[] = new CoaleseEqualTokenEmulator();
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$this->tokenEmulators[] = new NumericLiteralSeparatorEmulator();
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$this->tokenMap[self::T_COALESCE_EQUAL] = Tokens::T_COALESCE_EQUAL;
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$this->tokenMap[self::T_FN] = Tokens::T_FN;
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}
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public function startLexing(string $code, ErrorHandler $errorHandler = null) {
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$this->patches = [];
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if ($this->isEmulationNeeded($code) === false) {
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// Nothing to emulate, yay
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parent::startLexing($code, $errorHandler);
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return;
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}
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$collector = new ErrorHandler\Collecting();
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// 1. emulation of heredoc and nowdoc new syntax
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$preparedCode = $this->processHeredocNowdoc($code);
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parent::startLexing($preparedCode, $collector);
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$this->fixupTokens();
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$errors = $collector->getErrors();
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if (!empty($errors)) {
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$this->fixupErrors($errors);
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foreach ($errors as $error) {
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$errorHandler->handleError($error);
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}
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}
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// add token emulation
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foreach ($this->tokenEmulators as $emulativeToken) {
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if ($emulativeToken->isEmulationNeeded($code)) {
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$this->tokens = $emulativeToken->emulate($code, $this->tokens);
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}
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}
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}
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private function isHeredocNowdocEmulationNeeded(string $code): bool
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{
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// skip version where this works without emulation
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if (version_compare(\PHP_VERSION, self::PHP_7_3, '>=')) {
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return false;
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}
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return strpos($code, '<<<') !== false;
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}
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private function processHeredocNowdoc(string $code): string
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{
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if ($this->isHeredocNowdocEmulationNeeded($code) === false) {
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return $code;
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}
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if (!preg_match_all(self::FLEXIBLE_DOC_STRING_REGEX, $code, $matches, PREG_SET_ORDER|PREG_OFFSET_CAPTURE)) {
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// No heredoc/nowdoc found
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return $code;
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}
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// Keep track of how much we need to adjust string offsets due to the modifications we
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// already made
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$posDelta = 0;
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foreach ($matches as $match) {
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$indentation = $match['indentation'][0];
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$indentationStart = $match['indentation'][1];
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$separator = $match['separator'][0];
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$separatorStart = $match['separator'][1];
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if ($indentation === '' && $separator !== '') {
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// Ordinary heredoc/nowdoc
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continue;
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}
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if ($indentation !== '') {
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// Remove indentation
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$indentationLen = strlen($indentation);
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$code = substr_replace($code, '', $indentationStart + $posDelta, $indentationLen);
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$this->patches[] = [$indentationStart + $posDelta, 'add', $indentation];
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$posDelta -= $indentationLen;
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}
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if ($separator === '') {
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// Insert newline as separator
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$code = substr_replace($code, "\n", $separatorStart + $posDelta, 0);
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$this->patches[] = [$separatorStart + $posDelta, 'remove', "\n"];
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$posDelta += 1;
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}
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}
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return $code;
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}
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private function isEmulationNeeded(string $code): bool
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{
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foreach ($this->tokenEmulators as $emulativeToken) {
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if ($emulativeToken->isEmulationNeeded($code)) {
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return true;
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}
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}
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return $this->isHeredocNowdocEmulationNeeded($code);
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}
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private function fixupTokens()
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{
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if (\count($this->patches) === 0) {
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return;
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}
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// Load first patch
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$patchIdx = 0;
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list($patchPos, $patchType, $patchText) = $this->patches[$patchIdx];
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// We use a manual loop over the tokens, because we modify the array on the fly
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$pos = 0;
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for ($i = 0, $c = \count($this->tokens); $i < $c; $i++) {
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$token = $this->tokens[$i];
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if (\is_string($token)) {
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// We assume that patches don't apply to string tokens
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$pos += \strlen($token);
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continue;
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}
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$len = \strlen($token[1]);
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$posDelta = 0;
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while ($patchPos >= $pos && $patchPos < $pos + $len) {
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$patchTextLen = \strlen($patchText);
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if ($patchType === 'remove') {
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if ($patchPos === $pos && $patchTextLen === $len) {
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// Remove token entirely
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array_splice($this->tokens, $i, 1, []);
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$i--;
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$c--;
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} else {
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// Remove from token string
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$this->tokens[$i][1] = substr_replace(
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$token[1], '', $patchPos - $pos + $posDelta, $patchTextLen
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);
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$posDelta -= $patchTextLen;
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}
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} elseif ($patchType === 'add') {
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// Insert into the token string
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$this->tokens[$i][1] = substr_replace(
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$token[1], $patchText, $patchPos - $pos + $posDelta, 0
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);
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$posDelta += $patchTextLen;
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} else {
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assert(false);
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}
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// Fetch the next patch
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$patchIdx++;
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if ($patchIdx >= \count($this->patches)) {
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// No more patches, we're done
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return;
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}
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list($patchPos, $patchType, $patchText) = $this->patches[$patchIdx];
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// Multiple patches may apply to the same token. Reload the current one to check
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// If the new patch applies
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$token = $this->tokens[$i];
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}
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$pos += $len;
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}
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// A patch did not apply
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assert(false);
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}
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/**
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* Fixup line and position information in errors.
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*
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* @param Error[] $errors
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*/
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private function fixupErrors(array $errors) {
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foreach ($errors as $error) {
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$attrs = $error->getAttributes();
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$posDelta = 0;
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$lineDelta = 0;
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foreach ($this->patches as $patch) {
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list($patchPos, $patchType, $patchText) = $patch;
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if ($patchPos >= $attrs['startFilePos']) {
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// No longer relevant
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break;
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}
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if ($patchType === 'add') {
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$posDelta += strlen($patchText);
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$lineDelta += substr_count($patchText, "\n");
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} else {
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$posDelta -= strlen($patchText);
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$lineDelta -= substr_count($patchText, "\n");
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}
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}
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$attrs['startFilePos'] += $posDelta;
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$attrs['endFilePos'] += $posDelta;
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$attrs['startLine'] += $lineDelta;
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$attrs['endLine'] += $lineDelta;
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$error->setAttributes($attrs);
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}
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}
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}
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