return ($this->innerNode->xpath->query(".//*[(name()='form' or name()='iframe' or name()='img') and namespace-uri()='$namespace' and @name='$offset'] | .//img[namespace-uri()='$namespace' and @id='$offset' and @name and not(@name='')] | .//embed[namespace-uri()='$namespace' and @name='$offset' and not(ancestor::object[namespace-uri()='$namespace']) and not(descendant::*[(name()='embed' or name()='object') and namespace-uri()='$namespace'])] | .//object[namespace-uri()='$namespace' and @id='$offset' and not(ancestor::object[namespace-uri()='$namespace']) and not(descendant::*[(name()='embed' or name()='object') and namespace-uri()='$namespace'])]")->length > 0);
}
public function offsetGet(mixed $offset): Element|HTMLCollection|null {
// Because PHP is dumb and won't let us implement ArrayAccess with a more
// specific type than its interface...
if (!is_string($offset)) {
trigger_error('Type error; ' . __CLASS__ . ' keys may only be strings', \E_USER_ERROR);
}
// In JavaScript this part of the Document interface is implemented as
// properties. This is impractical in PHP because the said properties can
// contain characters which aren't valid PHP properties. So, this will be
// implemented as an ArrayAccess implementation instead.
# The Document interface supports named properties. The supported property names
# of a Document object document at any moment consist of the following, in tree
# order according to the element that contributed them, ignoring later
# duplicates, and with values from id attributes coming before values from name
# attributes when the same element contributes both:
# • the value of the name content attribute for all exposed embed, form, iframe,
# img, and exposed object elements that have a non-empty name content attribute
# and are in a document tree with document as their root;
# • the value of the id content attribute for all img elements that have both a
# non-empty id content attribute and a non-empty name content attribute, and are
# in a document tree with document as their root.
# To determine the value of a named property name for a Document, the user agent
# must return the value obtained using the following steps:
#
# 1. Let elements be the list of named elements with the name name that are in a
# document tree with the Document as their root.
# Named elements with the name name, for the purposes of the above algorithm,
# are those that are either:
# • Exposed embed, form, iframe, img, or exposed object elements that have a name
# content attribute whose value is name, or
# • Exposed object elements that have an id content attribute whose value is name,
# or
# • img elements that have an id content attribute whose value is name, and that
# have a non-empty name content attribute present also.
# An embed or object element is said to be exposed if it has no exposed object
# ancestor, and, for object elements, is additionally either not showing its
# fallback content or has no object or embed descendants.
$elements = $this->innerNode->xpath->query(".//*[(name()='form' or name()='iframe' or name()='img') and namespace-uri()='$namespace' and @name='$offset'] | .//img[namespace-uri()='$namespace' and @id='$offset' and @name and not(@name='')] | .//embed[namespace-uri()='$namespace' and @name='$offset' and not(ancestor::object[namespace-uri()='$namespace']) and not(descendant::*[(name()='embed' or name()='object') and namespace-uri()='$namespace'])] | .//object[namespace-uri()='$namespace' and @id='$offset' and not(ancestor::object[namespace-uri()='$namespace']) and not(descendant::*[(name()='embed' or name()='object') and namespace-uri()='$namespace'])]");
# NOTE: There will be at least one such element, by definition.
// This algorithm seems to expect user agents to keep up with a list of named
// elements as elements are manipulated... I think? It is very vague on this
// subject. There will of course be an instance where there's no such element --
// if there's no valid named element in the document. Browsers return undefined
// if there's no matching name, so let's return null here as PHP does not have
// undefined.
if ($elements->length === 0) {
return null;
}
# 2. If elements has only one element, and that element is an iframe element, and
# that iframe element's nested browsing context is not null, then return the
# WindowProxy object of the element's nested browsing context.
// No. This is stupid.
# 3. Otherwise, if elements has only one element, return that element.
$d = new Document('<!DOCTYPE html><html><body><imgname="ook"><imgname="eek"><imgid="eek"name="ack"><embedname="eek"><objectid="ook"><embedname="eek"><objectname="ookeek"></object></object><iframename="eek"></iframe><objectid="eek"></object></body></html>');
$d = new Document('<!DOCTYPE html><html><body><embed></embed><embed></embed><embed></embed><div><div><div><embed></embed></div></div></div></body></html>');
$this->assertEquals(4, $d->embeds->length);
@ -500,12 +692,74 @@ class TestDocument extends \PHPUnit\Framework\TestCase {
$d = new Document('<!DOCTYPE html><html><body><form></form><form></form><form></form><div><div><div><form></form></div></div></div><template><form></form></template></body></html>');
$d = new Document('<!DOCTYPE html><html><body><ahref=""></a><ahref=""></a><ahref=""></a><div><div><div><areahref=""></area></div></div></div><template><ahref=""></a></template></body></html>');
$d = new Document('<!DOCTYPE html><html><body><script></script><script></script><script></script><div><div><div><script></script></div></div></div><template><script></script></template></body></html>');
