<?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());
    }
}

• [D] Builder
• [D] Comment
• [D] ErrorHandler
• [D] Internal
• [D] Lexer
• [D] Node
• [D] NodeVisitor
• [D] Parser
• [D] PrettyPrinter
• [F] Builder.php
  Delete
• [F] BuilderFactory.php
  Delete
• [F] BuilderHelpers.php
  Delete
• [F] Comment.php
  Delete
• [F] compatibility_tokens.php
  Delete
• [F] ConstExprEvaluationException.php
  Delete
• [F] ConstExprEvaluator.php
  Delete
• [F] Error.php
  Delete
• [F] ErrorHandler.php
  Delete
• [F] JsonDecoder.php
  Delete
• [F] Lexer.php
  Delete
• [F] Modifiers.php
  Delete
• [F] NameContext.php
  Delete
• [F] Node.php
  Delete
• [F] NodeAbstract.php
  Delete
• [F] NodeDumper.php
  Delete
• [F] NodeFinder.php
  Delete
• [F] NodeTraverser.php
  Delete
• [F] NodeTraverserInterface.php
  Delete
• [F] NodeVisitor.php
  Delete
• [F] NodeVisitorAbstract.php
  Delete
• [F] Parser.php
  Delete
• [F] ParserAbstract.php
  Delete
• [F] ParserFactory.php
  Delete
• [F] PhpVersion.php
  Delete
• [F] PrettyPrinter.php
  Delete
• [F] PrettyPrinterAbstract.php
  Delete
• [F] Token.php
  Delete

About Section

About NFC Pay: Our Story and Mission

NFC Pay was founded with a vision to transform the way people handle transactions. Our journey is defined by a commitment to innovation, security, and convenience. We strive to deliver seamless, user-friendly payment solutions that make everyday transactions effortless and secure. Our mission is to empower you to pay with ease and confidence, anytime, anywhere.

• Simplifying Payments, One Tap at a Time.
• Reinventing Your Wallet for Modern Convenience.
• Smart Payments for a Effortless Lifestyle.
• Experience the Ease of Tap and Pay.
• Innovative Solutions for Your Daily Transactions.

FAQ Section

Frequently Asked Questions About NFC Pay

Here are answers to some common questions about NFC Pay. We aim to provide clear and concise information to help you understand how our platform works and how it can benefit you. If you have any further inquiries, please don’t hesitate to contact our support team.

How do I register for NFC Pay?

Download the app and sign up using your email or phone number, then complete the verification process.

Is my payment information secure?

Yes, we use advanced encryption and security protocols to protect your payment details.

Can I add multiple cards to my NFC Pay wallet?

Absolutely, you can link multiple debit or credit cards to your wallet.

How do I transfer money to another user?

Go to the transfer section, select the recipient, enter the amount, and authorize the transfer.

What should I do if I forget my PIN?

Use the “Forgot PIN” feature in the app to reset it following the provided instructions.

How can I activate my merchant account?

Sign up for a merchant account through the app and follow the setup instructions to start accepting payments.

Can I track my payment status?

Yes, you can view and track your payment status in the account dashboard