public function __construct(Parser $p)
{
$t = new Parser\Sequence();
$t->add(new Parser\CharClass(array('+', '-')));
$t->add($p);
$t->setHandler(new Handler\Signed());
parent::__construct($t);
}
/**
* @dataProvider operatorProvider
*/
public function testOperator($expression, $expected)
{
$sum = new P\Sequence();
$sum->add((new P\Number())->setHandler(new H\Value()));
$sum->add(new P\CharClass(array('+', '-', '*', '/', '^')));
$sum->add((new P\Number())->setHandler(new H\Value()));
$sum->setHandler(new H\Operator());
$this->assertEquals($expected, $this->evaluate($sum, $expression));
}
protected function sum(Parser $t)
{
$tail = new P\Sequence();
$tail->add(new P\CharClass(array('+', '-')));
$tail->add($t);
$tail->setHandler(new H\Operator());
$p = new P\Sequence();
$p->add($t);
$p->add(new P\Repeat($tail));
return $p;
}
public function testMayBe()
{
$p = new I\Parser\MayBe(new I\Parser\Word('token'));
$scan = self::scanner('notokenhere');
$ctx = $scan->getContext();
$this->assertTrue($p->scan($scan));
$this->assertEquals(0, $ctx->size());
$scan = self::scanner('token is presented');
$ctx = $scan->getContext();
$this->assertTrue($p->scan($scan));
$this->assertEquals(1, $ctx->size());
$p = new I\Parser\Sequence();
$p->add(new I\Parser\MayBe(new I\Parser\CharClass(array('-', '+'))));
$p->add(new I\Parser\Number());
$scan = self::scanner('-5 +7 18');
$ctx = $scan->getContext();
$this->assertTrue($p->scan($scan));
$this->assertEquals('5', $ctx->pop());
$this->assertEquals('-', $ctx->pop());
$this->assertTrue($p->scan($scan));
$this->assertEquals('7', $ctx->pop());
$this->assertEquals('+', $ctx->pop());
$this->assertTrue($p->scan($scan));
$this->assertEquals('18', $ctx->pop());
}
