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<?php
namespace Hamcrest\Xml;
/*
Copyright (c) 2009 hamcrest.org
*/
use Hamcrest\Core\IsEqual;
use Hamcrest\Description;
use Hamcrest\DiagnosingMatcher;
use Hamcrest\Matcher;
/**
* Matches if XPath applied to XML/HTML/XHTML document either
* evaluates to result matching the matcher or returns at least
* one node, matching the matcher if present.
*/
class HasXPath extends DiagnosingMatcher
{
/**
* XPath to apply to the DOM.
*
* @var string
*/
private $_xpath;
/**
* Optional matcher to apply to the XPath expression result
* or the content of the returned nodes.
*
* @var Matcher
*/
private $_matcher;
public function __construct($xpath, Matcher $matcher = null)
{
$this->_xpath = $xpath;
$this->_matcher = $matcher;
}
/**
* Matches if the XPath matches against the DOM node and the matcher.
*
* @param string|\DOMNode $actual
* @param Description $mismatchDescription
* @return bool
*/
protected function matchesWithDiagnosticDescription($actual, Description $mismatchDescription)
{
if (is_string($actual)) {
$actual = $this->createDocument($actual);
} elseif (!$actual instanceof \DOMNode) {
$mismatchDescription->appendText('was ')->appendValue($actual);
return false;
}
$result = $this->evaluate($actual);
if ($result instanceof \DOMNodeList) {
return $this->matchesContent($result, $mismatchDescription);
} else {
return $this->matchesExpression($result, $mismatchDescription);
}
}
/**
* Creates and returns a <code>DOMDocument</code> from the given
* XML or HTML string.
*
* @param string $text
* @return \DOMDocument built from <code>$text</code>
* @throws \InvalidArgumentException if the document is not valid
*/
protected function createDocument($text)
{
$document = new \DOMDocument();
if (preg_match('/^\s*<\?xml/', $text)) {
if (!@$document->loadXML($text)) {
throw new \InvalidArgumentException('Must pass a valid XML document');
}
} else {
if (!@$document->loadHTML($text)) {
throw new \InvalidArgumentException('Must pass a valid HTML or XHTML document');
}
}
return $document;
}
/**
* Applies the configured XPath to the DOM node and returns either
* the result if it's an expression or the node list if it's a query.
*
* @param \DOMNode $node context from which to issue query
* @return mixed result of expression or DOMNodeList from query
*/
protected function evaluate(\DOMNode $node)
{
if ($node instanceof \DOMDocument) {
$xpathDocument = new \DOMXPath($node);
return $xpathDocument->evaluate($this->_xpath);
} else {
$xpathDocument = new \DOMXPath($node->ownerDocument);
return $xpathDocument->evaluate($this->_xpath, $node);
}
}
/**
* Matches if the list of nodes is not empty and the content of at least
* one node matches the configured matcher, if supplied.
*
* @param \DOMNodeList $nodes selected by the XPath query
* @param Description $mismatchDescription
* @return bool
*/
protected function matchesContent(\DOMNodeList $nodes, Description $mismatchDescription)
{
if ($nodes->length == 0) {
$mismatchDescription->appendText('XPath returned no results');
} elseif ($this->_matcher === null) {
return true;
} else {
foreach ($nodes as $node) {
if ($this->_matcher->matches($node->textContent)) {
return true;
}
}
$content = array();
foreach ($nodes as $node) {
$content[] = $node->textContent;
}
$mismatchDescription->appendText('XPath returned ')
->appendValue($content);
}
return false;
}
/**
* Matches if the result of the XPath expression matches the configured
* matcher or evaluates to <code>true</code> if there is none.
*
* @param mixed $result result of the XPath expression
* @param Description $mismatchDescription
* @return bool
*/
protected function matchesExpression($result, Description $mismatchDescription)
{
if ($this->_matcher === null) {
if ($result) {
return true;
}
$mismatchDescription->appendText('XPath expression result was ')
->appendValue($result);
} else {
if ($this->_matcher->matches($result)) {
return true;
}
$mismatchDescription->appendText('XPath expression result ');
$this->_matcher->describeMismatch($result, $mismatchDescription);
}
return false;
}
public function describeTo(Description $description)
{
$description->appendText('XML or HTML document with XPath "')
->appendText($this->_xpath)
->appendText('"');
if ($this->_matcher !== null) {
$description->appendText(' ');
$this->_matcher->describeTo($description);
}
}
/**
* Wraps <code>$matcher</code> with {@link Hamcrest\Core\IsEqual)
* if it's not a matcher and the XPath in <code>count()</code>
* if it's an integer.
*
* @factory
*/
public static function hasXPath($xpath, $matcher = null)
{
if ($matcher === null || $matcher instanceof Matcher) {
return new self($xpath, $matcher);
} elseif (is_int($matcher) && strpos($xpath, 'count(') !== 0) {
$xpath = 'count(' . $xpath . ')';
}
return new self($xpath, IsEqual::equalTo($matcher));
}
}