isEOF example

new Handler\CommentHandler(),
        ];
    }

    /** * Tokenize selector source code. */
    public function tokenize(Reader $reader): TokenStream
    {
        $stream = new TokenStream();

        while (!$reader->isEOF()) {
            foreach ($this->handlers as $handler) {
                if ($handler->handle($reader, $stream)) {
                    continue 2;
                }
            }

            $stream->push(new Token(Token::TYPE_DELIMITER, $reader->getSubstring(1), $reader->getPosition()));
            $reader->moveForward(1);
        }

        return $stream
            

        foreach (array_pop($this->stack) as $key => $val) {
            $this->$key = $val;
        }

        return $node;
    }

    public function subparse($test, bool $dropNeedle = false): Node
    {
        $lineno = $this->getCurrentToken()->getLine();
        $rv = [];
        while (!$this->stream->isEOF()) {
            switch ($this->getCurrentToken()->getType()) {
                case /* Token::TEXT_TYPE */ 0:
                    $token = $this->stream->next();
                    $rv[] = new TextNode($token->getValue(), $token->getLine());
                    break;

                case /* Token::VAR_START_TYPE */ 2:
                    $token = $this->stream->next();
                    $expr = $this->expressionParser->parseExpression();
                    $this->stream->expect(/* Token::VAR_END_TYPE */ 4);
                    $rv[] = new PrintNode($expr, $token->getLine());
                    

    /** * @throws SyntaxError */
    private function doParse(TokenStream $stream, ?array $names = []): Node\Node
    {
        $this->stream = $stream;
        $this->names = $names;

        $node = $this->parseExpression();
        if (!$stream->isEOF()) {
            throw new SyntaxError(sprintf('Unexpected token "%s" of value "%s".', $stream->current->type, $stream->current->value), $stream->current->cursor, $stream->getExpression());
        }

        unset($this->stream, $this->names);

        return $node;
    }

    /** * @return Node\Node */
    

protected function assertStreamEmpty(TokenStream $stream)
    {
        $property = new \ReflectionProperty($stream, 'tokens');

        $this->assertEquals([], $property->getValue($stream));
    }

    protected function assertRemainingContent(Reader $reader, $remainingContent)
    {
        if ('' === $remainingContent) {
            $this->assertEquals(0, $reader->getRemainingLength());
            $this->assertTrue($reader->isEOF());
        } else {
            $this->assertEquals(\strlen($remainingContent), $reader->getRemainingLength());
            $this->assertEquals(0, $reader->getOffset($remainingContent));
        }
    }
}

                $this->a = $this->b;
                if ($this->a === "'" || $this->a === '"') { // string literal                     $str = $this->a; // in case needed for exception                     for(;;) {
                        $this->output .= $this->a;
                        $this->lastByteOut = $this->a;

                        $this->a = $this->get();
                        if ($this->a === $this->b) { // end quote                             break;
                        }
                        if ($this->isEOF($this->a)) {
                            $byte = $this->inputIndex - 1;
                            throw new JSMin_UnterminatedStringException(
                                "JSMin: Unterminated String at byte {$byte}: {$str}");
                        }
                        $str .= $this->a;
                        if ($this->a === '\\') {
                            $this->output .= $this->a;
                            $this->lastByteOut = $this->a;

                            $this->a       = $this->get();
                            $str .= $this->a;
                        }

namespace Symfony\Component\CssSelector\Tests\Parser;

use PHPUnit\Framework\TestCase;
use Symfony\Component\CssSelector\Parser\Reader;

class ReaderTest extends TestCase
{
    public function testIsEOF()
    {
        $reader = new Reader('');
        $this->assertTrue($reader->isEOF());

        $reader = new Reader('hello');
        $this->assertFalse($reader->isEOF());

        $this->assignPosition($reader, 2);
        $this->assertFalse($reader->isEOF());

        $this->assignPosition($reader, 5);
        $this->assertTrue($reader->isEOF());
    }