244 lines
8.5 KiB
PHP
244 lines
8.5 KiB
PHP
<?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\AttributeEmulator;
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use PhpParser\Lexer\TokenEmulator\EnumTokenEmulator;
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use PhpParser\Lexer\TokenEmulator\CoaleseEqualTokenEmulator;
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use PhpParser\Lexer\TokenEmulator\FlexibleDocStringEmulator;
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use PhpParser\Lexer\TokenEmulator\FnTokenEmulator;
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use PhpParser\Lexer\TokenEmulator\MatchTokenEmulator;
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use PhpParser\Lexer\TokenEmulator\NullsafeTokenEmulator;
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use PhpParser\Lexer\TokenEmulator\NumericLiteralSeparatorEmulator;
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use PhpParser\Lexer\TokenEmulator\ReverseEmulator;
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use PhpParser\Lexer\TokenEmulator\TokenEmulator;
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class Emulative extends Lexer
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{
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const PHP_7_3 = '7.3dev';
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const PHP_7_4 = '7.4dev';
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const PHP_8_0 = '8.0dev';
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const PHP_8_1 = '8.1dev';
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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 TokenEmulator[] */
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private $emulators = [];
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/** @var string */
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private $targetPhpVersion;
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/**
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* @param mixed[] $options Lexer options. In addition to the usual options,
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* accepts a 'phpVersion' string that specifies the
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* version to emulated. Defaults to newest supported.
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*/
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public function __construct(array $options = [])
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{
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$this->targetPhpVersion = $options['phpVersion'] ?? Emulative::PHP_8_1;
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unset($options['phpVersion']);
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parent::__construct($options);
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$emulators = [
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new FlexibleDocStringEmulator(),
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new FnTokenEmulator(),
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new MatchTokenEmulator(),
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new CoaleseEqualTokenEmulator(),
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new NumericLiteralSeparatorEmulator(),
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new NullsafeTokenEmulator(),
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new AttributeEmulator(),
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new EnumTokenEmulator(),
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];
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// Collect emulators that are relevant for the PHP version we're running
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// and the PHP version we're targeting for emulation.
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foreach ($emulators as $emulator) {
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$emulatorPhpVersion = $emulator->getPhpVersion();
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if ($this->isForwardEmulationNeeded($emulatorPhpVersion)) {
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$this->emulators[] = $emulator;
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} else if ($this->isReverseEmulationNeeded($emulatorPhpVersion)) {
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$this->emulators[] = new ReverseEmulator($emulator);
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}
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}
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}
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public function startLexing(string $code, ErrorHandler $errorHandler = null) {
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$emulators = array_filter($this->emulators, function($emulator) use($code) {
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return $emulator->isEmulationNeeded($code);
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});
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if (empty($emulators)) {
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// Nothing to emulate, yay
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parent::startLexing($code, $errorHandler);
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return;
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}
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$this->patches = [];
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foreach ($emulators as $emulator) {
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$code = $emulator->preprocessCode($code, $this->patches);
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}
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$collector = new ErrorHandler\Collecting();
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parent::startLexing($code, $collector);
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$this->sortPatches();
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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($error);
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}
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}
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foreach ($emulators as $emulator) {
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$this->tokens = $emulator->emulate($code, $this->tokens);
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}
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}
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private function isForwardEmulationNeeded(string $emulatorPhpVersion): bool {
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return version_compare(\PHP_VERSION, $emulatorPhpVersion, '<')
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&& version_compare($this->targetPhpVersion, $emulatorPhpVersion, '>=');
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}
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private function isReverseEmulationNeeded(string $emulatorPhpVersion): bool {
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return version_compare(\PHP_VERSION, $emulatorPhpVersion, '>=')
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&& version_compare($this->targetPhpVersion, $emulatorPhpVersion, '<');
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}
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private function sortPatches()
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{
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// Patches may be contributed by different emulators.
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// Make sure they are sorted by increasing patch position.
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usort($this->patches, function($p1, $p2) {
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return $p1[0] <=> $p2[0];
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});
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}
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private function fixupTokens()
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{
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if (\count($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($token)) {
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if ($patchPos === $pos) {
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// Only support replacement for string tokens.
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assert($patchType === 'replace');
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$this->tokens[$i] = $patchText;
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// Fetch the next patch
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$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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}
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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 += $patchTextLen;
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} else if ($patchType === 'replace') {
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// Replace inside the token string
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$this->tokens[$i][1] = substr_replace(
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$token[1], $patchText, $patchPos - $pos + $posDelta, $patchTextLen
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);
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} else {
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assert(false);
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}
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// Fetch the next patch
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$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 if ($patchType === 'remove') {
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$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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