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FunctionNode.php
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FunctionNode.php
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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\CssSelector\Node;
use Symfony\Component\CssSelector\Exception\ParseException;
use Symfony\Component\CssSelector\XPathExpr;
/**
* FunctionNode represents a "selector:name(expr)" node.
*
* This component is a port of the Python lxml library,
* which is copyright Infrae and distributed under the BSD license.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class FunctionNode implements NodeInterface
{
static protected $unsupported = array('target', 'lang', 'enabled', 'disabled');
protected $selector;
protected $type;
protected $name;
protected $expr;
/**
* Constructor.
*
* @param NodeInterface $selector The XPath expression
* @param string $type
* @param string $name
* @param XPathExpr $expr
*/
public function __construct($selector, $type, $name, $expr)
{
$this->selector = $selector;
$this->type = $type;
$this->name = $name;
$this->expr = $expr;
}
/**
* {@inheritDoc}
*/
public function __toString()
{
return sprintf('%s[%s%s%s(%s)]', __CLASS__, $this->selector, $this->type, $this->name, $this->expr);
}
/**
* {@inheritDoc}
* @throws ParseException When unsupported or unknown pseudo-class is found
*/
public function toXpath()
{
$selPath = $this->selector->toXpath();
if (in_array($this->name, self::$unsupported)) {
throw new ParseException(sprintf('The pseudo-class %s is not supported', $this->name));
}
$method = '_xpath_'.str_replace('-', '_', $this->name);
if (!method_exists($this, $method)) {
throw new ParseException(sprintf('The pseudo-class %s is unknown', $this->name));
}
return $this->$method($selPath, $this->expr);
}
/**
* undocumented function
*
* @param XPathExpr $xpath
* @param mixed $expr
* @param Boolean $last
* @param Boolean $addNameTest
*
* @return XPathExpr
*/
protected function _xpath_nth_child($xpath, $expr, $last = false, $addNameTest = true)
{
list($a, $b) = $this->parseSeries($expr);
if (!$a && !$b && !$last) {
// a=0 means nothing is returned...
$xpath->addCondition('false() and position() = 0');
return $xpath;
}
if ($addNameTest) {
$xpath->addNameTest();
}
$xpath->addStarPrefix();
if ($a == 0) {
if ($last) {
$b = sprintf('last() - %s', $b);
}
$xpath->addCondition(sprintf('position() = %s', $b));
return $xpath;
}
if ($last) {
// FIXME: I'm not sure if this is right
$a = -$a;
$b = -$b;
}
if ($b > 0) {
$bNeg = -$b;
} else {
$bNeg = sprintf('+%s', -$b);
}
if ($a != 1) {
$expr = array(sprintf('(position() %s) mod %s = 0', $bNeg, $a));
} else {
$expr = array();
}
if ($b >= 0) {
$expr[] = sprintf('position() >= %s', $b);
} elseif ($b < 0 && $last) {
$expr[] = sprintf('position() < (last() %s)', $b);
}
$expr = implode($expr, ' and ');
if ($expr) {
$xpath->addCondition($expr);
}
return $xpath;
/* FIXME: 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 */
}
/**
* undocumented function
*
* @param XPathExpr $xpath
* @param XPathExpr $expr
*
* @return XPathExpr
*/
protected function _xpath_nth_last_child($xpath, $expr)
{
return $this->_xpath_nth_child($xpath, $expr, true);
}
/**
* undocumented function
*
* @param XPathExpr $xpath
* @param XPathExpr $expr
*
* @return XPathExpr
*/
protected function _xpath_nth_of_type($xpath, $expr)
{
if ($xpath->getElement() == '*') {
throw new ParseException('*:nth-of-type() is not implemented');
}
return $this->_xpath_nth_child($xpath, $expr, false, false);
}
/**
* undocumented function
*
* @param XPathExpr $xpath
* @param XPathExpr $expr
*
* @return XPathExpr
*/
protected function _xpath_nth_last_of_type($xpath, $expr)
{
return $this->_xpath_nth_child($xpath, $expr, true, false);
}
/**
* undocumented function
*
* @param XPathExpr $xpath
* @param XPathExpr $expr
*
* @return XPathExpr
*/
protected function _xpath_contains($xpath, $expr)
{
// text content, minus tags, must contain expr
if ($expr instanceof ElementNode) {
$expr = $expr->formatElement();
}
// FIXME: lower-case is only available with XPath 2
//$xpath->addCondition(sprintf('contains(lower-case(string(.)), %s)', XPathExpr::xpathLiteral(strtolower($expr))));
$xpath->addCondition(sprintf('contains(string(.), %s)', XPathExpr::xpathLiteral($expr)));
// FIXME: Currently case insensitive matching doesn't seem to be happening
return $xpath;
}
/**
* undocumented function
*
* @param XPathExpr $xpath
* @param XPathExpr $expr
*
* @return XPathExpr
*/
protected function _xpath_not($xpath, $expr)
{
// everything for which not expr applies
$expr = $expr->toXpath();
$cond = $expr->getCondition();
// FIXME: should I do something about element_path?
$xpath->addCondition(sprintf('not(%s)', $cond));
return $xpath;
}
/**
* Parses things like '1n+2', or 'an+b' generally, returning (a, b)
*
* @param mixed $s
*
* @return array
*/
protected function parseSeries($s)
{
if ($s instanceof ElementNode) {
$s = $s->formatElement();
}
if (!$s || '*' == $s) {
// Happens when there's nothing, which the CSS parser thinks of as *
return array(0, 0);
}
if (is_string($s)) {
// Happens when you just get a number
return array(0, $s);
}
if ('odd' == $s) {
return array(2, 1);
}
if ('even' == $s) {
return array(2, 0);
}
if ('n' == $s) {
return array(1, 0);
}
if (false === strpos($s, 'n')) {
// Just a b
return array(0, intval((string) $s));
}
list($a, $b) = explode('n', $s);
if (!$a) {
$a = 1;
} elseif ('-' == $a || '+' == $a) {
$a = intval($a.'1');
} else {
$a = intval($a);
}
if (!$b) {
$b = 0;
} elseif ('-' == $b || '+' == $b) {
$b = intval($b.'1');
} else {
$b = intval($b);
}
return array($a, $b);
}
}