Файл: vendor/nikic/php-parser/lib/PhpParser/Lexer.php
Строк: 831
<?php declare(strict_types=1);
namespace PhpParser;
use PhpParserParserTokens;
class Lexer
{
protected $code;
protected $tokens;
protected $pos;
protected $line;
protected $filePos;
protected $prevCloseTagHasNewline;
protected $tokenMap;
protected $dropTokens;
protected $identifierTokens;
private $attributeStartLineUsed;
private $attributeEndLineUsed;
private $attributeStartTokenPosUsed;
private $attributeEndTokenPosUsed;
private $attributeStartFilePosUsed;
private $attributeEndFilePosUsed;
private $attributeCommentsUsed;
/**
* Creates a Lexer.
*
* @param array $options Options array. Currently only the 'usedAttributes' option is supported,
* which is an array of attributes to add to the AST nodes. Possible
* attributes are: 'comments', 'startLine', 'endLine', 'startTokenPos',
* 'endTokenPos', 'startFilePos', 'endFilePos'. The option defaults to the
* first three. For more info see getNextToken() docs.
*/
public function __construct(array $options = []) {
// Create Map from internal tokens to PhpParser tokens.
$this->defineCompatibilityTokens();
$this->tokenMap = $this->createTokenMap();
$this->identifierTokens = $this->createIdentifierTokenMap();
// map of tokens to drop while lexing (the map is only used for isset lookup,
// that's why the value is simply set to 1; the value is never actually used.)
$this->dropTokens = array_fill_keys(
[T_WHITESPACE, T_OPEN_TAG, T_COMMENT, T_DOC_COMMENT, T_BAD_CHARACTER], 1
);
$defaultAttributes = ['comments', 'startLine', 'endLine'];
$usedAttributes = array_fill_keys($options['usedAttributes'] ?? $defaultAttributes, true);
// Create individual boolean properties to make these checks faster.
$this->attributeStartLineUsed = isset($usedAttributes['startLine']);
$this->attributeEndLineUsed = isset($usedAttributes['endLine']);
$this->attributeStartTokenPosUsed = isset($usedAttributes['startTokenPos']);
$this->attributeEndTokenPosUsed = isset($usedAttributes['endTokenPos']);
$this->attributeStartFilePosUsed = isset($usedAttributes['startFilePos']);
$this->attributeEndFilePosUsed = isset($usedAttributes['endFilePos']);
$this->attributeCommentsUsed = isset($usedAttributes['comments']);
}
/**
* Initializes the lexer for lexing the provided source code.
*
* This function does not throw if lexing errors occur. Instead, errors may be retrieved using
* the getErrors() method.
*
* @param string $code The source code to lex
* @param ErrorHandler|null $errorHandler Error handler to use for lexing errors. Defaults to
* ErrorHandlerThrowing
*/
public function startLexing(string $code, ErrorHandler $errorHandler = null) {
if (null === $errorHandler) {
$errorHandler = new ErrorHandlerThrowing();
}
$this->code = $code; // keep the code around for __halt_compiler() handling
$this->pos = -1;
$this->line = 1;
$this->filePos = 0;
// If inline HTML occurs without preceding code, treat it as if it had a leading newline.
// This ensures proper composability, because having a newline is the "safe" assumption.
$this->prevCloseTagHasNewline = true;
$scream = ini_set('xdebug.scream', '0');
$this->tokens = @token_get_all($code);
$this->postprocessTokens($errorHandler);
if (false !== $scream) {
ini_set('xdebug.scream', $scream);
}
}
private function handleInvalidCharacterRange($start, $end, $line, ErrorHandler $errorHandler) {
$tokens = [];
for ($i = $start; $i < $end; $i++) {
$chr = $this->code[$i];
if ($chr === " ") {
// PHP cuts error message after null byte, so need special case
$errorMsg = 'Unexpected null byte';
} else {
$errorMsg = sprintf(
'Unexpected character "%s" (ASCII %d)', $chr, ord($chr)
);
}
$tokens[] = [T_BAD_CHARACTER, $chr, $line];
$errorHandler->handleError(new Error($errorMsg, [
'startLine' => $line,
'endLine' => $line,
'startFilePos' => $i,
'endFilePos' => $i,
]));
}
return $tokens;
}
/**
* Check whether comment token is unterminated.
*
* @return bool
*/
private function isUnterminatedComment($token) : bool {
return ($token[0] === T_COMMENT || $token[0] === T_DOC_COMMENT)
&& substr($token[1], 0, 2) === '/*'
&& substr($token[1], -2) !== '*/';
}
protected function postprocessTokens(ErrorHandler $errorHandler) {
// PHP's error handling for token_get_all() is rather bad, so if we want detailed
// error information we need to compute it ourselves. Invalid character errors are
// detected by finding "gaps" in the token array. Unterminated comments are detected
// by checking if a trailing comment has a "*/" at the end.
//
// Additionally, we perform a number of canonicalizations here:
// * Use the PHP 8.0 comment format, which does not include trailing whitespace anymore.
// * Use PHP 8.0 T_NAME_* tokens.
// * Use PHP 8.1 T_AMPERSAND_NOT_FOLLOWED_BY_VAR_OR_VARARG and
// T_AMPERSAND_FOLLOWED_BY_VAR_OR_VARARG tokens used to disambiguate intersection types.
$filePos = 0;
$line = 1;
$numTokens = count($this->tokens);
for ($i = 0; $i < $numTokens; $i++) {
$token = $this->tokens[$i];
// Since PHP 7.4 invalid characters are represented by a T_BAD_CHARACTER token.
// In this case we only need to emit an error.
if ($token[0] === T_BAD_CHARACTER) {
$this->handleInvalidCharacterRange($filePos, $filePos + 1, $line, $errorHandler);
}
if ($token[0] === T_COMMENT && substr($token[1], 0, 2) !== '/*'
&& preg_match('/(rn|n|r)$/D', $token[1], $matches)) {
$trailingNewline = $matches[0];
$token[1] = substr($token[1], 0, -strlen($trailingNewline));
$this->tokens[$i] = $token;
if (isset($this->tokens[$i + 1]) && $this->tokens[$i + 1][0] === T_WHITESPACE) {
// Move trailing newline into following T_WHITESPACE token, if it already exists.
$this->tokens[$i + 1][1] = $trailingNewline . $this->tokens[$i + 1][1];
$this->tokens[$i + 1][2]--;
} else {
// Otherwise, we need to create a new T_WHITESPACE token.
array_splice($this->tokens, $i + 1, 0, [
[T_WHITESPACE, $trailingNewline, $line],
]);
$numTokens++;
}
}
// Emulate PHP 8 T_NAME_* tokens, by combining sequences of T_NS_SEPARATOR and T_STRING
// into a single token.
if (is_array($token)
&& ($token[0] === T_NS_SEPARATOR || isset($this->identifierTokens[$token[0]]))) {
$lastWasSeparator = $token[0] === T_NS_SEPARATOR;
$text = $token[1];
for ($j = $i + 1; isset($this->tokens[$j]); $j++) {
if ($lastWasSeparator) {
if (!isset($this->identifierTokens[$this->tokens[$j][0]])) {
break;
}
$lastWasSeparator = false;
} else {
if ($this->tokens[$j][0] !== T_NS_SEPARATOR) {
break;
}
$lastWasSeparator = true;
}
$text .= $this->tokens[$j][1];
}
if ($lastWasSeparator) {
// Trailing separator is not part of the name.
$j--;
$text = substr($text, 0, -1);
}
if ($j > $i + 1) {
if ($token[0] === T_NS_SEPARATOR) {
$type = T_NAME_FULLY_QUALIFIED;
} else if ($token[0] === T_NAMESPACE) {
$type = T_NAME_RELATIVE;
} else {
$type = T_NAME_QUALIFIED;
}
$token = [$type, $text, $line];
array_splice($this->tokens, $i, $j - $i, [$token]);
$numTokens -= $j - $i - 1;
}
}
if ($token === '&') {
$next = $i + 1;
while (isset($this->tokens[$next]) && $this->tokens[$next][0] === T_WHITESPACE) {
$next++;
}
$followedByVarOrVarArg = isset($this->tokens[$next]) &&
($this->tokens[$next][0] === T_VARIABLE || $this->tokens[$next][0] === T_ELLIPSIS);
$this->tokens[$i] = $token = [
$followedByVarOrVarArg
? T_AMPERSAND_FOLLOWED_BY_VAR_OR_VARARG
: T_AMPERSAND_NOT_FOLLOWED_BY_VAR_OR_VARARG,
'&',
$line,
];
}
$tokenValue = is_string($token) ? $token : $token[1];
$tokenLen = strlen($tokenValue);
if (substr($this->code, $filePos, $tokenLen) !== $tokenValue) {
// Something is missing, must be an invalid character
$nextFilePos = strpos($this->code, $tokenValue, $filePos);
$badCharTokens = $this->handleInvalidCharacterRange(
$filePos, $nextFilePos, $line, $errorHandler);
$filePos = (int) $nextFilePos;
array_splice($this->tokens, $i, 0, $badCharTokens);
$numTokens += count($badCharTokens);
$i += count($badCharTokens);
}
$filePos += $tokenLen;
$line += substr_count($tokenValue, "n");
}
if ($filePos !== strlen($this->code)) {
if (substr($this->code, $filePos, 2) === '/*') {
// Unlike PHP, HHVM will drop unterminated comments entirely
$comment = substr($this->code, $filePos);
$errorHandler->handleError(new Error('Unterminated comment', [
'startLine' => $line,
'endLine' => $line + substr_count($comment, "n"),
'startFilePos' => $filePos,
'endFilePos' => $filePos + strlen($comment),
]));
// Emulate the PHP behavior
$isDocComment = isset($comment[3]) && $comment[3] === '*';
$this->tokens[] = [$isDocComment ? T_DOC_COMMENT : T_COMMENT, $comment, $line];
} else {
// Invalid characters at the end of the input
$badCharTokens = $this->handleInvalidCharacterRange(
$filePos, strlen($this->code), $line, $errorHandler);
$this->tokens = array_merge($this->tokens, $badCharTokens);
}
return;
}
if (count($this->tokens) > 0) {
// Check for unterminated comment
$lastToken = $this->tokens[count($this->tokens) - 1];
if ($this->isUnterminatedComment($lastToken)) {
$errorHandler->handleError(new Error('Unterminated comment', [
'startLine' => $line - substr_count($lastToken[1], "n"),
'endLine' => $line,
'startFilePos' => $filePos - strlen($lastToken[1]),
'endFilePos' => $filePos,
]));
}
}
}
/**
* Fetches the next token.
*
* The available attributes are determined by the 'usedAttributes' option, which can
* be specified in the constructor. The following attributes are supported:
*
* * 'comments' => Array of PhpParserComment or PhpParserCommentDoc instances,
* representing all comments that occurred between the previous
* non-discarded token and the current one.
* * 'startLine' => Line in which the node starts.
* * 'endLine' => Line in which the node ends.
* * 'startTokenPos' => Offset into the token array of the first token in the node.
* * 'endTokenPos' => Offset into the token array of the last token in the node.
* * 'startFilePos' => Offset into the code string of the first character that is part of the node.
* * 'endFilePos' => Offset into the code string of the last character that is part of the node.
*
* @param mixed $value Variable to store token content in
* @param mixed $startAttributes Variable to store start attributes in
* @param mixed $endAttributes Variable to store end attributes in
*
* @return int Token id
*/
public function getNextToken(&$value = null, &$startAttributes = null, &$endAttributes = null) : int {
$startAttributes = [];
$endAttributes = [];
while (1) {
if (isset($this->tokens[++$this->pos])) {
$token = $this->tokens[$this->pos];
} else {
// EOF token with ID 0
$token = " ";
}
if ($this->attributeStartLineUsed) {
$startAttributes['startLine'] = $this->line;
}
if ($this->attributeStartTokenPosUsed) {
$startAttributes['startTokenPos'] = $this->pos;
}
if ($this->attributeStartFilePosUsed) {
$startAttributes['startFilePos'] = $this->filePos;
}
if (is_string($token)) {
$value = $token;
if (isset($token[1])) {
// bug in token_get_all
$this->filePos += 2;
$id = ord('"');
} else {
$this->filePos += 1;
$id = ord($token);
}
} elseif (!isset($this->dropTokens[$token[0]])) {
$value = $token[1];
$id = $this->tokenMap[$token[0]];
if (T_CLOSE_TAG === $token[0]) {
$this->prevCloseTagHasNewline = false !== strpos($token[1], "n")
|| false !== strpos($token[1], "r");
} elseif (T_INLINE_HTML === $token[0]) {
$startAttributes['hasLeadingNewline'] = $this->prevCloseTagHasNewline;
}
$this->line += substr_count($value, "n");
$this->filePos += strlen($value);
} else {
$origLine = $this->line;
$origFilePos = $this->filePos;
$this->line += substr_count($token[1], "n");
$this->filePos += strlen($token[1]);
if (T_COMMENT === $token[0] || T_DOC_COMMENT === $token[0]) {
if ($this->attributeCommentsUsed) {
$comment = T_DOC_COMMENT === $token[0]
? new CommentDoc($token[1],
$origLine, $origFilePos, $this->pos,
$this->line, $this->filePos - 1, $this->pos)
: new Comment($token[1],
$origLine, $origFilePos, $this->pos,
$this->line, $this->filePos - 1, $this->pos);
$startAttributes['comments'][] = $comment;
}
}
continue;
}
if ($this->attributeEndLineUsed) {
$endAttributes['endLine'] = $this->line;
}
if ($this->attributeEndTokenPosUsed) {
$endAttributes['endTokenPos'] = $this->pos;
}
if ($this->attributeEndFilePosUsed) {
$endAttributes['endFilePos'] = $this->filePos - 1;
}
return $id;
}
throw new RuntimeException('Reached end of lexer loop');
}
/**
* Returns the token array for current code.
*
* The token array is in the same format as provided by the
* token_get_all() function and does not discard tokens (i.e.
* whitespace and comments are included). The token position
* attributes are against this token array.
*
* @return array Array of tokens in token_get_all() format
*/
public function getTokens() : array {
return $this->tokens;
}
/**
* Handles __halt_compiler() by returning the text after it.
*
* @return string Remaining text
*/
public function handleHaltCompiler() : string {
// text after T_HALT_COMPILER, still including ();
$textAfter = substr($this->code, $this->filePos);
// ensure that it is followed by ();
// this simplifies the situation, by not allowing any comments
// in between of the tokens.
if (!preg_match('~^s*(s*)s*(?:;|?>r?n?)~', $textAfter, $matches)) {
throw new Error('__HALT_COMPILER must be followed by "();"');
}
// prevent the lexer from returning any further tokens
$this->pos = count($this->tokens);
// return with (); removed
return substr($textAfter, strlen($matches[0]));
}
private function defineCompatibilityTokens() {
static $compatTokensDefined = false;
if ($compatTokensDefined) {
return;
}
$compatTokens = [
// PHP 7.4
'T_BAD_CHARACTER',
'T_FN',
'T_COALESCE_EQUAL',
// PHP 8.0
'T_NAME_QUALIFIED',
'T_NAME_FULLY_QUALIFIED',
'T_NAME_RELATIVE',
'T_MATCH',
'T_NULLSAFE_OBJECT_OPERATOR',
'T_ATTRIBUTE',
// PHP 8.1
'T_ENUM',
'T_AMPERSAND_NOT_FOLLOWED_BY_VAR_OR_VARARG',
'T_AMPERSAND_FOLLOWED_BY_VAR_OR_VARARG',
'T_READONLY',
];
// PHP-Parser might be used together with another library that also emulates some or all
// of these tokens. Perform a sanity-check that all already defined tokens have been
// assigned a unique ID.
$usedTokenIds = [];
foreach ($compatTokens as $token) {
if (defined($token)) {
$tokenId = constant($token);
$clashingToken = $usedTokenIds[$tokenId] ?? null;
if ($clashingToken !== null) {
throw new Error(sprintf(
'Token %s has same ID as token %s, ' .
'you may be using a library with broken token emulation',
$token, $clashingToken
));
}
$usedTokenIds[$tokenId] = $token;
}
}
// Now define any tokens that have not yet been emulated. Try to assign IDs from -1
// downwards, but skip any IDs that may already be in use.
$newTokenId = -1;
foreach ($compatTokens as $token) {
if (!defined($token)) {
while (isset($usedTokenIds[$newTokenId])) {
$newTokenId--;
}
define($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);
}
}