561 lines
24 KiB
PHP
Executable File
561 lines
24 KiB
PHP
Executable File
<?php declare(strict_types=1);
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namespace PhpParser;
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use PhpParser\Parser\Tokens;
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class Lexer
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{
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protected $code;
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protected $tokens;
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protected $pos;
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protected $line;
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protected $filePos;
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protected $prevCloseTagHasNewline;
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protected $tokenMap;
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protected $dropTokens;
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protected $identifierTokens;
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private $attributeStartLineUsed;
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private $attributeEndLineUsed;
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private $attributeStartTokenPosUsed;
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private $attributeEndTokenPosUsed;
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private $attributeStartFilePosUsed;
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private $attributeEndFilePosUsed;
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private $attributeCommentsUsed;
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/**
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* Creates a Lexer.
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*
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* @param array $options Options array. Currently only the 'usedAttributes' option is supported,
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* which is an array of attributes to add to the AST nodes. Possible
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* attributes are: 'comments', 'startLine', 'endLine', 'startTokenPos',
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* 'endTokenPos', 'startFilePos', 'endFilePos'. The option defaults to the
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* first three. For more info see getNextToken() docs.
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*/
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public function __construct(array $options = []) {
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// Create Map from internal tokens to PhpParser tokens.
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$this->defineCompatibilityTokens();
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$this->tokenMap = $this->createTokenMap();
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$this->identifierTokens = $this->createIdentifierTokenMap();
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// map of tokens to drop while lexing (the map is only used for isset lookup,
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// that's why the value is simply set to 1; the value is never actually used.)
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$this->dropTokens = array_fill_keys(
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[\T_WHITESPACE, \T_OPEN_TAG, \T_COMMENT, \T_DOC_COMMENT, \T_BAD_CHARACTER], 1
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);
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$defaultAttributes = ['comments', 'startLine', 'endLine'];
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$usedAttributes = array_fill_keys($options['usedAttributes'] ?? $defaultAttributes, true);
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// Create individual boolean properties to make these checks faster.
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$this->attributeStartLineUsed = isset($usedAttributes['startLine']);
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$this->attributeEndLineUsed = isset($usedAttributes['endLine']);
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$this->attributeStartTokenPosUsed = isset($usedAttributes['startTokenPos']);
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$this->attributeEndTokenPosUsed = isset($usedAttributes['endTokenPos']);
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$this->attributeStartFilePosUsed = isset($usedAttributes['startFilePos']);
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$this->attributeEndFilePosUsed = isset($usedAttributes['endFilePos']);
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$this->attributeCommentsUsed = isset($usedAttributes['comments']);
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}
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/**
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* Initializes the lexer for lexing the provided source code.
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*
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* This function does not throw if lexing errors occur. Instead, errors may be retrieved using
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* the getErrors() method.
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*
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* @param string $code The source code to lex
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* @param ErrorHandler|null $errorHandler Error handler to use for lexing errors. Defaults to
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* ErrorHandler\Throwing
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*/
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public function startLexing(string $code, ErrorHandler $errorHandler = null) {
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if (null === $errorHandler) {
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$errorHandler = new ErrorHandler\Throwing();
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}
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$this->code = $code; // keep the code around for __halt_compiler() handling
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$this->pos = -1;
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$this->line = 1;
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$this->filePos = 0;
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// If inline HTML occurs without preceding code, treat it as if it had a leading newline.
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// This ensures proper composability, because having a newline is the "safe" assumption.
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$this->prevCloseTagHasNewline = true;
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$scream = ini_set('xdebug.scream', '0');
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$this->tokens = @token_get_all($code);
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$this->postprocessTokens($errorHandler);
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if (false !== $scream) {
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ini_set('xdebug.scream', $scream);
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}
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}
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private function handleInvalidCharacterRange($start, $end, $line, ErrorHandler $errorHandler) {
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$tokens = [];
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for ($i = $start; $i < $end; $i++) {
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$chr = $this->code[$i];
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if ($chr === "\0") {
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// PHP cuts error message after null byte, so need special case
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$errorMsg = 'Unexpected null byte';
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} else {
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$errorMsg = sprintf(
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'Unexpected character "%s" (ASCII %d)', $chr, ord($chr)
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);
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}
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$tokens[] = [\T_BAD_CHARACTER, $chr, $line];
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$errorHandler->handleError(new Error($errorMsg, [
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'startLine' => $line,
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'endLine' => $line,
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'startFilePos' => $i,
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'endFilePos' => $i,
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]));
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}
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return $tokens;
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}
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/**
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* Check whether comment token is unterminated.
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*
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* @return bool
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*/
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private function isUnterminatedComment($token) : bool {
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return ($token[0] === \T_COMMENT || $token[0] === \T_DOC_COMMENT)
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&& substr($token[1], 0, 2) === '/*'
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&& substr($token[1], -2) !== '*/';
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}
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protected function postprocessTokens(ErrorHandler $errorHandler) {
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// PHP's error handling for token_get_all() is rather bad, so if we want detailed
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// error information we need to compute it ourselves. Invalid character errors are
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// detected by finding "gaps" in the token array. Unterminated comments are detected
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// by checking if a trailing comment has a "*/" at the end.
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//
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// Additionally, we perform a number of canonicalizations here:
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// * Use the PHP 8.0 comment format, which does not include trailing whitespace anymore.
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// * Use PHP 8.0 T_NAME_* tokens.
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// * Use PHP 8.1 T_AMPERSAND_NOT_FOLLOWED_BY_VAR_OR_VARARG and
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// T_AMPERSAND_FOLLOWED_BY_VAR_OR_VARARG tokens used to disambiguate intersection types.
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$filePos = 0;
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$line = 1;
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$numTokens = \count($this->tokens);
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for ($i = 0; $i < $numTokens; $i++) {
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$token = $this->tokens[$i];
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// Since PHP 7.4 invalid characters are represented by a T_BAD_CHARACTER token.
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// In this case we only need to emit an error.
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if ($token[0] === \T_BAD_CHARACTER) {
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$this->handleInvalidCharacterRange($filePos, $filePos + 1, $line, $errorHandler);
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}
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if ($token[0] === \T_COMMENT && substr($token[1], 0, 2) !== '/*'
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&& preg_match('/(\r\n|\n|\r)$/D', $token[1], $matches)) {
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$trailingNewline = $matches[0];
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$token[1] = substr($token[1], 0, -strlen($trailingNewline));
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$this->tokens[$i] = $token;
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if (isset($this->tokens[$i + 1]) && $this->tokens[$i + 1][0] === \T_WHITESPACE) {
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// Move trailing newline into following T_WHITESPACE token, if it already exists.
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$this->tokens[$i + 1][1] = $trailingNewline . $this->tokens[$i + 1][1];
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$this->tokens[$i + 1][2]--;
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} else {
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// Otherwise, we need to create a new T_WHITESPACE token.
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array_splice($this->tokens, $i + 1, 0, [
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[\T_WHITESPACE, $trailingNewline, $line],
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]);
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$numTokens++;
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}
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}
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// Emulate PHP 8 T_NAME_* tokens, by combining sequences of T_NS_SEPARATOR and T_STRING
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// into a single token.
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if (\is_array($token)
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&& ($token[0] === \T_NS_SEPARATOR || isset($this->identifierTokens[$token[0]]))) {
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$lastWasSeparator = $token[0] === \T_NS_SEPARATOR;
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$text = $token[1];
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for ($j = $i + 1; isset($this->tokens[$j]); $j++) {
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if ($lastWasSeparator) {
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if (!isset($this->identifierTokens[$this->tokens[$j][0]])) {
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break;
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}
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$lastWasSeparator = false;
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} else {
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if ($this->tokens[$j][0] !== \T_NS_SEPARATOR) {
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break;
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}
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$lastWasSeparator = true;
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}
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$text .= $this->tokens[$j][1];
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}
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if ($lastWasSeparator) {
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// Trailing separator is not part of the name.
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$j--;
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$text = substr($text, 0, -1);
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}
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if ($j > $i + 1) {
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if ($token[0] === \T_NS_SEPARATOR) {
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$type = \T_NAME_FULLY_QUALIFIED;
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} else if ($token[0] === \T_NAMESPACE) {
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$type = \T_NAME_RELATIVE;
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} else {
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$type = \T_NAME_QUALIFIED;
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}
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$token = [$type, $text, $line];
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array_splice($this->tokens, $i, $j - $i, [$token]);
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$numTokens -= $j - $i - 1;
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}
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}
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if ($token === '&') {
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$next = $i + 1;
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while (isset($this->tokens[$next]) && $this->tokens[$next][0] === \T_WHITESPACE) {
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$next++;
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}
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$followedByVarOrVarArg = isset($this->tokens[$next]) &&
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($this->tokens[$next][0] === \T_VARIABLE || $this->tokens[$next][0] === \T_ELLIPSIS);
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$this->tokens[$i] = $token = [
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$followedByVarOrVarArg
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? \T_AMPERSAND_FOLLOWED_BY_VAR_OR_VARARG
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: \T_AMPERSAND_NOT_FOLLOWED_BY_VAR_OR_VARARG,
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'&',
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$line,
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];
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}
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$tokenValue = \is_string($token) ? $token : $token[1];
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$tokenLen = \strlen($tokenValue);
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if (substr($this->code, $filePos, $tokenLen) !== $tokenValue) {
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// Something is missing, must be an invalid character
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$nextFilePos = strpos($this->code, $tokenValue, $filePos);
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$badCharTokens = $this->handleInvalidCharacterRange(
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$filePos, $nextFilePos, $line, $errorHandler);
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$filePos = (int) $nextFilePos;
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array_splice($this->tokens, $i, 0, $badCharTokens);
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$numTokens += \count($badCharTokens);
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$i += \count($badCharTokens);
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}
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$filePos += $tokenLen;
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$line += substr_count($tokenValue, "\n");
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}
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if ($filePos !== \strlen($this->code)) {
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if (substr($this->code, $filePos, 2) === '/*') {
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// Unlike PHP, HHVM will drop unterminated comments entirely
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$comment = substr($this->code, $filePos);
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$errorHandler->handleError(new Error('Unterminated comment', [
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'startLine' => $line,
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'endLine' => $line + substr_count($comment, "\n"),
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'startFilePos' => $filePos,
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'endFilePos' => $filePos + \strlen($comment),
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]));
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// Emulate the PHP behavior
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$isDocComment = isset($comment[3]) && $comment[3] === '*';
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$this->tokens[] = [$isDocComment ? \T_DOC_COMMENT : \T_COMMENT, $comment, $line];
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} else {
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// Invalid characters at the end of the input
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$badCharTokens = $this->handleInvalidCharacterRange(
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$filePos, \strlen($this->code), $line, $errorHandler);
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$this->tokens = array_merge($this->tokens, $badCharTokens);
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}
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return;
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}
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if (count($this->tokens) > 0) {
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// Check for unterminated comment
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$lastToken = $this->tokens[count($this->tokens) - 1];
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if ($this->isUnterminatedComment($lastToken)) {
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$errorHandler->handleError(new Error('Unterminated comment', [
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'startLine' => $line - substr_count($lastToken[1], "\n"),
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'endLine' => $line,
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'startFilePos' => $filePos - \strlen($lastToken[1]),
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'endFilePos' => $filePos,
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]));
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}
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}
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}
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/**
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* Fetches the next token.
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*
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* The available attributes are determined by the 'usedAttributes' option, which can
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* be specified in the constructor. The following attributes are supported:
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*
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* * 'comments' => Array of PhpParser\Comment or PhpParser\Comment\Doc instances,
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* representing all comments that occurred between the previous
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* non-discarded token and the current one.
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* * 'startLine' => Line in which the node starts.
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* * 'endLine' => Line in which the node ends.
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* * 'startTokenPos' => Offset into the token array of the first token in the node.
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* * 'endTokenPos' => Offset into the token array of the last token in the node.
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* * 'startFilePos' => Offset into the code string of the first character that is part of the node.
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* * 'endFilePos' => Offset into the code string of the last character that is part of the node.
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*
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* @param mixed $value Variable to store token content in
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* @param mixed $startAttributes Variable to store start attributes in
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* @param mixed $endAttributes Variable to store end attributes in
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*
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* @return int Token id
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*/
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public function getNextToken(&$value = null, &$startAttributes = null, &$endAttributes = null) : int {
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$startAttributes = [];
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$endAttributes = [];
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while (1) {
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if (isset($this->tokens[++$this->pos])) {
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$token = $this->tokens[$this->pos];
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} else {
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// EOF token with ID 0
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$token = "\0";
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}
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if ($this->attributeStartLineUsed) {
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$startAttributes['startLine'] = $this->line;
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}
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if ($this->attributeStartTokenPosUsed) {
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$startAttributes['startTokenPos'] = $this->pos;
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}
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if ($this->attributeStartFilePosUsed) {
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$startAttributes['startFilePos'] = $this->filePos;
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}
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if (\is_string($token)) {
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$value = $token;
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if (isset($token[1])) {
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// bug in token_get_all
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$this->filePos += 2;
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$id = ord('"');
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} else {
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$this->filePos += 1;
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$id = ord($token);
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}
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} elseif (!isset($this->dropTokens[$token[0]])) {
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$value = $token[1];
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$id = $this->tokenMap[$token[0]];
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if (\T_CLOSE_TAG === $token[0]) {
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$this->prevCloseTagHasNewline = false !== strpos($token[1], "\n")
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|| false !== strpos($token[1], "\r");
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} elseif (\T_INLINE_HTML === $token[0]) {
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$startAttributes['hasLeadingNewline'] = $this->prevCloseTagHasNewline;
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}
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$this->line += substr_count($value, "\n");
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$this->filePos += \strlen($value);
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} else {
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$origLine = $this->line;
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$origFilePos = $this->filePos;
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$this->line += substr_count($token[1], "\n");
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$this->filePos += \strlen($token[1]);
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if (\T_COMMENT === $token[0] || \T_DOC_COMMENT === $token[0]) {
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if ($this->attributeCommentsUsed) {
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$comment = \T_DOC_COMMENT === $token[0]
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? new Comment\Doc($token[1],
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$origLine, $origFilePos, $this->pos,
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$this->line, $this->filePos - 1, $this->pos)
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: new Comment($token[1],
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$origLine, $origFilePos, $this->pos,
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$this->line, $this->filePos - 1, $this->pos);
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$startAttributes['comments'][] = $comment;
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}
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}
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continue;
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}
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if ($this->attributeEndLineUsed) {
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$endAttributes['endLine'] = $this->line;
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}
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if ($this->attributeEndTokenPosUsed) {
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$endAttributes['endTokenPos'] = $this->pos;
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}
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if ($this->attributeEndFilePosUsed) {
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$endAttributes['endFilePos'] = $this->filePos - 1;
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}
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return $id;
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}
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throw new \RuntimeException('Reached end of lexer loop');
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}
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/**
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* Returns the token array for current code.
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*
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* The token array is in the same format as provided by the
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* token_get_all() function and does not discard tokens (i.e.
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* whitespace and comments are included). The token position
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* attributes are against this token array.
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*
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* @return array Array of tokens in token_get_all() format
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*/
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public function getTokens() : array {
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return $this->tokens;
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}
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/**
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* Handles __halt_compiler() by returning the text after it.
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*
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* @return string Remaining text
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*/
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public function handleHaltCompiler() : string {
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// text after T_HALT_COMPILER, still including ();
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$textAfter = substr($this->code, $this->filePos);
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// ensure that it is followed by ();
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// this simplifies the situation, by not allowing any comments
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// in between of the tokens.
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if (!preg_match('~^\s*\(\s*\)\s*(?:;|\?>\r?\n?)~', $textAfter, $matches)) {
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throw new Error('__HALT_COMPILER must be followed by "();"');
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}
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// prevent the lexer from returning any further tokens
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$this->pos = count($this->tokens);
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// return with (); removed
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return substr($textAfter, strlen($matches[0]));
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}
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private function defineCompatibilityTokens() {
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static $compatTokensDefined = false;
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if ($compatTokensDefined) {
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return;
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}
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$compatTokens = [
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// PHP 7.4
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'T_BAD_CHARACTER',
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'T_FN',
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'T_COALESCE_EQUAL',
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// PHP 8.0
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'T_NAME_QUALIFIED',
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'T_NAME_FULLY_QUALIFIED',
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'T_NAME_RELATIVE',
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'T_MATCH',
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'T_NULLSAFE_OBJECT_OPERATOR',
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'T_ATTRIBUTE',
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// PHP 8.1
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'T_ENUM',
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'T_AMPERSAND_NOT_FOLLOWED_BY_VAR_OR_VARARG',
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'T_AMPERSAND_FOLLOWED_BY_VAR_OR_VARARG',
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'T_READONLY',
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];
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// PHP-Parser might be used together with another library that also emulates some or all
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// of these tokens. Perform a sanity-check that all already defined tokens have been
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// assigned a unique ID.
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$usedTokenIds = [];
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foreach ($compatTokens as $token) {
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if (\defined($token)) {
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$tokenId = \constant($token);
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$clashingToken = $usedTokenIds[$tokenId] ?? null;
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if ($clashingToken !== null) {
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throw new \Error(sprintf(
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'Token %s has same ID as token %s, ' .
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'you may be using a library with broken token emulation',
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$token, $clashingToken
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));
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}
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$usedTokenIds[$tokenId] = $token;
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}
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}
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// Now define any tokens that have not yet been emulated. Try to assign IDs from -1
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// downwards, but skip any IDs that may already be in use.
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$newTokenId = -1;
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foreach ($compatTokens as $token) {
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if (!\defined($token)) {
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while (isset($usedTokenIds[$newTokenId])) {
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$newTokenId--;
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}
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\define($token, $newTokenId);
|
|
$newTokenId--;
|
|
}
|
|
}
|
|
|
|
$compatTokensDefined = true;
|
|
}
|
|
|
|
/**
|
|
* Creates the token map.
|
|
*
|
|
* The token map maps the PHP internal token identifiers
|
|
* to the identifiers used by the Parser. Additionally it
|
|
* maps T_OPEN_TAG_WITH_ECHO to T_ECHO and T_CLOSE_TAG to ';'.
|
|
*
|
|
* @return array The token map
|
|
*/
|
|
protected function createTokenMap() : array {
|
|
$tokenMap = [];
|
|
|
|
// 256 is the minimum possible token number, as everything below
|
|
// it is an ASCII value
|
|
for ($i = 256; $i < 1000; ++$i) {
|
|
if (\T_DOUBLE_COLON === $i) {
|
|
// T_DOUBLE_COLON is equivalent to T_PAAMAYIM_NEKUDOTAYIM
|
|
$tokenMap[$i] = Tokens::T_PAAMAYIM_NEKUDOTAYIM;
|
|
} elseif(\T_OPEN_TAG_WITH_ECHO === $i) {
|
|
// T_OPEN_TAG_WITH_ECHO with dropped T_OPEN_TAG results in T_ECHO
|
|
$tokenMap[$i] = Tokens::T_ECHO;
|
|
} elseif(\T_CLOSE_TAG === $i) {
|
|
// T_CLOSE_TAG is equivalent to ';'
|
|
$tokenMap[$i] = ord(';');
|
|
} elseif ('UNKNOWN' !== $name = token_name($i)) {
|
|
if ('T_HASHBANG' === $name) {
|
|
// HHVM uses a special token for #! hashbang lines
|
|
$tokenMap[$i] = Tokens::T_INLINE_HTML;
|
|
} elseif (defined($name = Tokens::class . '::' . $name)) {
|
|
// Other tokens can be mapped directly
|
|
$tokenMap[$i] = constant($name);
|
|
}
|
|
}
|
|
}
|
|
|
|
// HHVM uses a special token for numbers that overflow to double
|
|
if (defined('T_ONUMBER')) {
|
|
$tokenMap[\T_ONUMBER] = Tokens::T_DNUMBER;
|
|
}
|
|
// HHVM also has a separate token for the __COMPILER_HALT_OFFSET__ constant
|
|
if (defined('T_COMPILER_HALT_OFFSET')) {
|
|
$tokenMap[\T_COMPILER_HALT_OFFSET] = Tokens::T_STRING;
|
|
}
|
|
|
|
// Assign tokens for which we define compatibility constants, as token_name() does not know them.
|
|
$tokenMap[\T_FN] = Tokens::T_FN;
|
|
$tokenMap[\T_COALESCE_EQUAL] = Tokens::T_COALESCE_EQUAL;
|
|
$tokenMap[\T_NAME_QUALIFIED] = Tokens::T_NAME_QUALIFIED;
|
|
$tokenMap[\T_NAME_FULLY_QUALIFIED] = Tokens::T_NAME_FULLY_QUALIFIED;
|
|
$tokenMap[\T_NAME_RELATIVE] = Tokens::T_NAME_RELATIVE;
|
|
$tokenMap[\T_MATCH] = Tokens::T_MATCH;
|
|
$tokenMap[\T_NULLSAFE_OBJECT_OPERATOR] = Tokens::T_NULLSAFE_OBJECT_OPERATOR;
|
|
$tokenMap[\T_ATTRIBUTE] = Tokens::T_ATTRIBUTE;
|
|
$tokenMap[\T_AMPERSAND_NOT_FOLLOWED_BY_VAR_OR_VARARG] = Tokens::T_AMPERSAND_NOT_FOLLOWED_BY_VAR_OR_VARARG;
|
|
$tokenMap[\T_AMPERSAND_FOLLOWED_BY_VAR_OR_VARARG] = Tokens::T_AMPERSAND_FOLLOWED_BY_VAR_OR_VARARG;
|
|
$tokenMap[\T_ENUM] = Tokens::T_ENUM;
|
|
$tokenMap[\T_READONLY] = Tokens::T_READONLY;
|
|
|
|
return $tokenMap;
|
|
}
|
|
|
|
private function createIdentifierTokenMap(): array {
|
|
// Based on semi_reserved production.
|
|
return array_fill_keys([
|
|
\T_STRING,
|
|
\T_STATIC, \T_ABSTRACT, \T_FINAL, \T_PRIVATE, \T_PROTECTED, \T_PUBLIC, \T_READONLY,
|
|
\T_INCLUDE, \T_INCLUDE_ONCE, \T_EVAL, \T_REQUIRE, \T_REQUIRE_ONCE, \T_LOGICAL_OR, \T_LOGICAL_XOR, \T_LOGICAL_AND,
|
|
\T_INSTANCEOF, \T_NEW, \T_CLONE, \T_EXIT, \T_IF, \T_ELSEIF, \T_ELSE, \T_ENDIF, \T_ECHO, \T_DO, \T_WHILE,
|
|
\T_ENDWHILE, \T_FOR, \T_ENDFOR, \T_FOREACH, \T_ENDFOREACH, \T_DECLARE, \T_ENDDECLARE, \T_AS, \T_TRY, \T_CATCH,
|
|
\T_FINALLY, \T_THROW, \T_USE, \T_INSTEADOF, \T_GLOBAL, \T_VAR, \T_UNSET, \T_ISSET, \T_EMPTY, \T_CONTINUE, \T_GOTO,
|
|
\T_FUNCTION, \T_CONST, \T_RETURN, \T_PRINT, \T_YIELD, \T_LIST, \T_SWITCH, \T_ENDSWITCH, \T_CASE, \T_DEFAULT,
|
|
\T_BREAK, \T_ARRAY, \T_CALLABLE, \T_EXTENDS, \T_IMPLEMENTS, \T_NAMESPACE, \T_TRAIT, \T_INTERFACE, \T_CLASS,
|
|
\T_CLASS_C, \T_TRAIT_C, \T_FUNC_C, \T_METHOD_C, \T_LINE, \T_FILE, \T_DIR, \T_NS_C, \T_HALT_COMPILER, \T_FN,
|
|
\T_MATCH,
|
|
], true);
|
|
}
|
|
}
|