/** @dataProvider getParseSeriesExceptionTestData */
public function testParseSeriesException($series)
{
$parser = new Parser();
$selectors = $parser->parse(sprintf(':nth-child(%s)', $series));
$this->assertCount(1, $selectors);
/** @var FunctionNode $function */
$function = $selectors[0]->getTree();
$this->setExpectedException('Symfony\\Component\\CssSelector\\Exception\\SyntaxErrorException');
Parser::parseSeries($function->getArguments());
}
/**
* @param XPathExpr $xpath
* @param FunctionNode $function
* @param boolean $last
* @param boolean $addNameTest
*
* @return XPathExpr
*
* @throws ExpressionErrorException
*/
public function translateNthChild(XPathExpr $xpath, FunctionNode $function, $last = false, $addNameTest = true)
{
try {
list($a, $b) = Parser::parseSeries($function->getArguments());
} catch (SyntaxErrorException $e) {
throw new ExpressionErrorException(sprintf('Invalid series: %s', implode(', ', $function->getArguments())), 0, $e);
}
$xpath->addStarPrefix();
if ($addNameTest) {
$xpath->addNameTest();
}
if (0 === $a) {
return $xpath->addCondition('position() = ' . ($last ? 'last() - ' . $b : $b));
}
if ($last) {
// todo: verify if this is right
$a = -$a;
$b = -$b;
}
$conditions = 1 === $a ? array() : array(sprintf('(position() %s) mod %s = 0', $b > 0 ? (string) -$b : '+' . -$b, $a));
if ($b >= 0) {
$conditions[] = 'position() >= ' . $b;
} elseif ($last) {
$conditions[] = sprintf('position() < (last() %s)', $b);
}
// todo: handle an+b, odd, even
// an+b means every-a, plus b, e.g., 2n+1 means odd
// 0n+b means b
// n+0 means a=1, i.e., all elements
// an means every a elements, i.e., 2n means even
// -n means -1n
// -1n+6 means elements 6 and previous
return empty($conditions) ? $xpath : $xpath->addCondition(implode(' and ', $conditions));
}
/**
* @param XPathExpr $xpath
* @param FunctionNode $function
* @param bool $last
* @param bool $addNameTest
*
* @return XPathExpr
*
* @throws ExpressionErrorException
*/
public function translateNthChild(XPathExpr $xpath, FunctionNode $function, $last = false, $addNameTest = true)
{
try {
list($a, $b) = Parser::parseSeries($function->getArguments());
} catch (SyntaxErrorException $e) {
throw new ExpressionErrorException(sprintf('Invalid series: %s', implode(', ', $function->getArguments())), 0, $e);
}
$xpath->addStarPrefix();
if ($addNameTest) {
$xpath->addNameTest();
}
if (0 === $a) {
return $xpath->addCondition('position() = ' . ($last ? 'last() - ' . ($b - 1) : $b));
}
if ($a < 0) {
if ($b < 1) {
return $xpath->addCondition('false()');
}
$sign = '<=';
} else {
$sign = '>=';
}
$expr = 'position()';
if ($last) {
$expr = 'last() - ' . $expr;
$b--;
}
if (0 !== $b) {
$expr .= ' - ' . $b;
}
$conditions = array(sprintf('%s %s 0', $expr, $sign));
if (1 !== $a && -1 !== $a) {
$conditions[] = sprintf('(%s) mod %d = 0', $expr, $a);
}
return $xpath->addCondition(implode(' and ', $conditions));
// todo: handle an+b, odd, even
// an+b means every-a, plus b, e.g., 2n+1 means odd
// 0n+b means b
// n+0 means a=1, i.e., all elements
// an means every a elements, i.e., 2n means even
// -n means -1n
// -1n+6 means elements 6 and previous
}
