<?php declare(strict_types=1);
namespace PhpParser;
require __DIR__ . '/compatibility_tokens.php';
class Lexer {
/**
* Tokenize the provided source code.
*
* The token array is in the same format as provided by the PhpToken::tokenize() method in
* PHP 8.0. The tokens are instances of PhpParser\Token, to abstract over a polyfill
* implementation in earlier PHP version.
*
* The token array is terminated by a sentinel token with token ID 0.
* The token array does not discard any tokens (i.e. whitespace and comments are included).
* The token position attributes are against this token array.
*
* @param string $code The source code to tokenize.
* @param ErrorHandler|null $errorHandler Error handler to use for lexing errors. Defaults to
* ErrorHandler\Throwing.
* @return Token[] Tokens
*/
public function tokenize(string $code, ?ErrorHandler $errorHandler = null): array {
if (null === $errorHandler) {
$errorHandler = new ErrorHandler\Throwing();
}
$scream = ini_set('xdebug.scream', '0');
$tokens = @Token::tokenize($code);
$this->postprocessTokens($tokens, $errorHandler);
if (false !== $scream) {
ini_set('xdebug.scream', $scream);
}
return $tokens;
}
private function handleInvalidCharacter(Token $token, ErrorHandler $errorHandler): void {
$chr = $token->text;
if ($chr === "\0") {
// 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)
);
}
$errorHandler->handleError(new Error($errorMsg, [
'startLine' => $token->line,
'endLine' => $token->line,
'startFilePos' => $token->pos,
'endFilePos' => $token->pos,
]));
}
private function isUnterminatedComment(Token $token): bool {
return $token->is([\T_COMMENT, \T_DOC_COMMENT])
&& substr($token->text, 0, 2) === '/*'
&& substr($token->text, -2) !== '*/';
}
/**
* @param list<Token> $tokens
*/
protected function postprocessTokens(array &$tokens, ErrorHandler $errorHandler): void {
// This function reports errors (bad characters and unterminated comments) in the token
// array, and performs certain canonicalizations:
// * 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.
// * Add a sentinel token with ID 0.
$numTokens = \count($tokens);
if ($numTokens === 0) {
// Empty input edge case: Just add the sentinel token.
$tokens[] = new Token(0, "\0", 1, 0);
return;
}
for ($i = 0; $i < $numTokens; $i++) {
$token = $tokens[$i];
if ($token->id === \T_BAD_CHARACTER) {
$this->handleInvalidCharacter($token, $errorHandler);
}
if ($token->id === \ord('&')) {
$next = $i + 1;
while (isset($tokens[$next]) && $tokens[$next]->id === \T_WHITESPACE) {
$next++;
}
$followedByVarOrVarArg = isset($tokens[$next]) &&
$tokens[$next]->is([\T_VARIABLE, \T_ELLIPSIS]);
$token->id = $followedByVarOrVarArg
? \T_AMPERSAND_FOLLOWED_BY_VAR_OR_VARARG
: \T_AMPERSAND_NOT_FOLLOWED_BY_VAR_OR_VARARG;
}
}
// Check for unterminated comment
$lastToken = $tokens[$numTokens - 1];
if ($this->isUnterminatedComment($lastToken)) {
$errorHandler->handleError(new Error('Unterminated comment', [
'startLine' => $lastToken->line,
'endLine' => $lastToken->getEndLine(),
'startFilePos' => $lastToken->pos,
'endFilePos' => $lastToken->getEndPos(),
]));
}
// Add sentinel token.
$tokens[] = new Token(0, "\0", $lastToken->getEndLine(), $lastToken->getEndPos());
}
}
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