/**
* {@inheritDoc}
*/
public function toXPath()
{
$xpath = $this->selector->toXPath();
$attrib = $this->xpathAttrib();
$value = $this->value;
switch ($this->operator) {
case 'exists':
$xpath->addCondition($attrib);
break;
case '=':
$xpath->addCondition(sprintf('%s = %s', $attrib, XPath\Expression::xpathLiteral($value)));
break;
case '!=':
// FIXME: this seems like a weird hack...
if ($value) {
$xpath->addCondition(sprintf('not(%s) or %s != %s', $attrib, $attrib, XPath\Expression::xpathLiteral($value)));
} else {
$xpath->addCondition(sprintf('%s != %s', $attrib, XPath\Expression::xpathLiteral($value)));
}
break;
case '^=':
$xpath->addCondition(sprintf('starts-with(%s, %s)', $attrib, XPath\Expression::xpathLiteral($value)));
break;
case '*=':
// FIXME: case sensitive?
$xpath->addCondition(sprintf('contains(%s, %s)', $attrib, XPath\Expression::xpathLiteral($value)));
break;
case '$=':
// Oddly there is a starts-with in XPath 1.0, but not ends-with
$value = XPath\Expression::xpathLiteral($value);
$xpath->addCondition(sprintf('substring(%s, string-length(%s) - string-length(%s) + 1, string-length(%s)) = %s', $attrib, $attrib, $value, $value, $value));
break;
case '|=':
// Weird, but true...
$value = XPath\Expression::xpathLiteral($value);
$xpath->addCondition(sprintf('%s = %s or starts-with(%s, concat(%s, "-"))', $attrib, $value, $attrib, $value));
break;
case '~=':
$xpath->addCondition(sprintf("contains(concat(' ', normalize-space(%s), ' '), concat(' ', %s, ' '))", $attrib, XPath\Expression::xpathLiteral($value)));
break;
default:
throw new ParseException(sprintf('Unknown operator: %s', $this->operator));
break;
}
return $xpath;
}
/**
* {@inheritDoc}
*/
public function toXPath()
{
$path = $this->selector->toXPath();
$path->addCondition(sprintf('@id = %s', XPath\Expression::xpathLiteral($this->id)));
return $path;
}
/**
* Adds a condition to this XPath expression using the name of the element
* as the desired value.
* This method resets the element to '*'.
*/
public function addNameTest()
{
if ($this->element == '*') {
// We weren't doing a test anyway
return;
}
$this->addCondition(sprintf('name() = %s', Expression::xpathLiteral($this->element)));
$this->element = '*';
}
/**
* undocumented function
*
* @param XPath\Expression $xpath The XPath expression
* @return XPath\Expression The modified expression
*/
protected function xpath_empty($xpath)
{
$xpath->addCondition('not(*) and not(normalize-space())');
return $xpath;
}
/**
* undocumented function
*
* @param XPath\Expression $xpath
* @param mixed $expr
* @return XPath\Expression
*/
protected function xpath_not(XPath\Expression $xpath, $expr)
{
// everything for which not expr applies
if ($expr instanceof ElementSelector) {
$xpath->addCondition(sprintf("not(name() = '%s')", $expr->toXpath()));
return $xpath;
}
$expr = $expr->toXPath();
$cond = $expr->getCondition();
if ($cond) {
// FIXME: should I do something about element_path?
$xpath->addCondition(sprintf('not(%s)', $cond));
} else {
$xpath->addCondition('0');
}
return $xpath;
}
