wmde / hamcrest-html-matchers

src/TagNameMatcher.php

Indentation +34 added lines, -34 removed lines

@@ -8,39 +8,39 @@
 
 class TagNameMatcher extends TagMatcher {
 
-	/**
-	 * @var Matcher
-	 */
-	private $tagNameMatcher;
-
-	public static function withTagName( $tagName ) {
-		return new static( Util::wrapValueWithIsEqual( $tagName ) );
-	}
-
-	public function __construct( Matcher $tagNameMatcher ) {
-		parent::__construct();
-		$this->tagNameMatcher = $tagNameMatcher;
-	}
-
-	public function describeTo( Description $description ) {
-		$description->appendText( 'with tag name ' )
-			->appendDescriptionOf( $this->tagNameMatcher );
-	}
-
-	/**
-	 * @param \DOMElement $item
-	 * @param Description $mismatchDescription
-	 *
-	 * @return bool
-	 */
-	protected function matchesSafelyWithDiagnosticDescription( $item, Description $mismatchDescription ) {
-		if ( $this->tagNameMatcher->matches( $item->tagName ) ) {
-			return true;
-		}
-
-		$mismatchDescription->appendText( 'tag name ' );
-		$this->tagNameMatcher->describeMismatch( $item->tagName, $mismatchDescription );
-		return false;
-	}
+    /**
+     * @var Matcher
+     */
+    private $tagNameMatcher;
+
+    public static function withTagName( $tagName ) {
+        return new static( Util::wrapValueWithIsEqual( $tagName ) );
+    }
+
+    public function __construct( Matcher $tagNameMatcher ) {
+        parent::__construct();
+        $this->tagNameMatcher = $tagNameMatcher;
+    }
+
+    public function describeTo( Description $description ) {
+        $description->appendText( 'with tag name ' )
+            ->appendDescriptionOf( $this->tagNameMatcher );
+    }
+
+    /**
+     * @param \DOMElement $item
+     * @param Description $mismatchDescription
+     *
+     * @return bool
+     */
+    protected function matchesSafelyWithDiagnosticDescription( $item, Description $mismatchDescription ) {
+        if ( $this->tagNameMatcher->matches( $item->tagName ) ) {
+            return true;
+        }
+
+        $mismatchDescription->appendText( 'tag name ' );
+        $this->tagNameMatcher->describeMismatch( $item->tagName, $mismatchDescription );
+        return false;
+    }
 
 }

src/HtmlMatcher.php

Indentation +89 added lines, -89 removed lines

@@ -8,94 +8,94 @@
 
 class HtmlMatcher extends DiagnosingMatcher {
 
-	/**
-	 * @link http://www.xmlsoft.org/html/libxml-xmlerror.html#xmlParserErrors
-	 * @link https://github.com/Chronic-Dev/libxml2/blob/683f296a905710ff285c28b8644ef3a3d8be9486/include/libxml/xmlerror.h#L257
-	 */
-	const XML_UNKNOWN_TAG_ERROR_CODE = 801;
-
-	/**
-	 * @var Matcher
-	 */
-	private $elementMatcher;
-
-	/**
-	 * @param Matcher $elementMatcher
-	 *
-	 * @return HtmlMatcher
-	 */
-	public static function htmlPiece( Matcher $elementMatcher = null ) {
-		return new static( $elementMatcher );
-	}
-
-	private function __construct( Matcher $elementMatcher = null ) {
-		$this->elementMatcher = $elementMatcher;
-	}
-
-	public function describeTo( Description $description ) {
-		$description->appendText( 'valid html piece ' );
-		if ( $this->elementMatcher ) {
-			$description->appendDescriptionOf( $this->elementMatcher );
-		}
-	}
-
-	protected function matchesWithDiagnosticDescription( $html, Description $mismatchDescription ) {
-		$internalErrors = libxml_use_internal_errors( true );
-		$document = new \DOMDocument();
-
-		$html = $this->escapeScriptTagContents( $html );
-
-		if ( !@$document->loadHTML( mb_convert_encoding( $html, 'HTML-ENTITIES', 'UTF-8' ) ) ) {
-			$mismatchDescription->appendText( 'there was some parsing error' );
-			return false;
-		}
-
-		$errors = libxml_get_errors();
-		libxml_clear_errors();
-		libxml_use_internal_errors( $internalErrors );
-
-		$result = true;
-		/** @var \LibXMLError $error */
-		foreach ( $errors as $error ) {
-			if ( $this->isUnknownTagError( $error ) ) {
-				continue;
-			}
-
-			$mismatchDescription->appendText( 'there was parsing error: ' )
-				->appendText( trim( $error->message ) )
-				->appendText( ' on line ' )
-				->appendText( $error->line );
-			$result = false;
-		}
-
-		if ( !$result ) {
-			return false;
-		}
-		$mismatchDescription->appendText( 'valid html piece ' );
-
-		if ( $this->elementMatcher ) {
-			$result = $this->elementMatcher->matches( $document );
-			$this->elementMatcher->describeMismatch( $document, $mismatchDescription );
-		}
-
-		$mismatchDescription->appendText( "\nActual html:\n" )->appendText( $html );
-
-		return $result;
-	}
-
-	private function isUnknownTagError( \LibXMLError $error ) {
-		return $error->code === self::XML_UNKNOWN_TAG_ERROR_CODE;
-	}
-
-	/**
-	 * @param string $html
-	 *
-	 * @return string HTML
-	 */
-	private function escapeScriptTagContents( $html ) {
-		return preg_replace_callback( '#(<script.*>)(.*)(</script>)#isU', function ( $matches ) {
-			return $matches[1] . str_replace( '</', '<\/', $matches[2] ) . $matches[3];
-		}, $html );
-	}
+    /**
+     * @link http://www.xmlsoft.org/html/libxml-xmlerror.html#xmlParserErrors
+     * @link https://github.com/Chronic-Dev/libxml2/blob/683f296a905710ff285c28b8644ef3a3d8be9486/include/libxml/xmlerror.h#L257
+     */
+    const XML_UNKNOWN_TAG_ERROR_CODE = 801;
+
+    /**
+     * @var Matcher
+     */
+    private $elementMatcher;
+
+    /**
+     * @param Matcher $elementMatcher
+     *
+     * @return HtmlMatcher
+     */
+    public static function htmlPiece( Matcher $elementMatcher = null ) {
+        return new static( $elementMatcher );
+    }
+
+    private function __construct( Matcher $elementMatcher = null ) {
+        $this->elementMatcher = $elementMatcher;
+    }
+
+    public function describeTo( Description $description ) {
+        $description->appendText( 'valid html piece ' );
+        if ( $this->elementMatcher ) {
+            $description->appendDescriptionOf( $this->elementMatcher );
+        }
+    }
+
+    protected function matchesWithDiagnosticDescription( $html, Description $mismatchDescription ) {
+        $internalErrors = libxml_use_internal_errors( true );
+        $document = new \DOMDocument();
+
+        $html = $this->escapeScriptTagContents( $html );
+
+        if ( !@$document->loadHTML( mb_convert_encoding( $html, 'HTML-ENTITIES', 'UTF-8' ) ) ) {
+            $mismatchDescription->appendText( 'there was some parsing error' );
+            return false;
+        }
+
+        $errors = libxml_get_errors();
+        libxml_clear_errors();
+        libxml_use_internal_errors( $internalErrors );
+
+        $result = true;
+        /** @var \LibXMLError $error */
+        foreach ( $errors as $error ) {
+            if ( $this->isUnknownTagError( $error ) ) {
+                continue;
+            }
+
+            $mismatchDescription->appendText( 'there was parsing error: ' )
+                ->appendText( trim( $error->message ) )
+                ->appendText( ' on line ' )
+                ->appendText( $error->line );
+            $result = false;
+        }
+
+        if ( !$result ) {
+            return false;
+        }
+        $mismatchDescription->appendText( 'valid html piece ' );
+
+        if ( $this->elementMatcher ) {
+            $result = $this->elementMatcher->matches( $document );
+            $this->elementMatcher->describeMismatch( $document, $mismatchDescription );
+        }
+
+        $mismatchDescription->appendText( "\nActual html:\n" )->appendText( $html );
+
+        return $result;
+    }
+
+    private function isUnknownTagError( \LibXMLError $error ) {
+        return $error->code === self::XML_UNKNOWN_TAG_ERROR_CODE;
+    }
+
+    /**
+     * @param string $html
+     *
+     * @return string HTML
+     */
+    private function escapeScriptTagContents( $html ) {
+        return preg_replace_callback( '#(<script.*>)(.*)(</script>)#isU', function ( $matches ) {
+            return $matches[1] . str_replace( '</', '<\/', $matches[2] ) . $matches[3];
+        }, $html );
+    }
 
 }

src/RootElementMatcher.php

Indentation +48 added lines, -48 removed lines

@@ -8,60 +8,60 @@
 
 class RootElementMatcher extends TypeSafeDiagnosingMatcher {
 
-	/**
-	 * @var Matcher
-	 */
-	private $tagMatcher;
+    /**
+     * @var Matcher
+     */
+    private $tagMatcher;
 
-	/**
-	 * @param Matcher|null $tagMatcher
-	 *
-	 * @return static
-	 */
-	public static function havingRootElement( Matcher $tagMatcher = null ) {
-		return new static( $tagMatcher );
-	}
+    /**
+     * @param Matcher|null $tagMatcher
+     *
+     * @return static
+     */
+    public static function havingRootElement( Matcher $tagMatcher = null ) {
+        return new static( $tagMatcher );
+    }
 
-	public function __construct( Matcher $tagMatcher = null ) {
-		parent::__construct( self::TYPE_OBJECT, \DOMDocument::class );
-		$this->tagMatcher = $tagMatcher;
-	}
+    public function __construct( Matcher $tagMatcher = null ) {
+        parent::__construct( self::TYPE_OBJECT, \DOMDocument::class );
+        $this->tagMatcher = $tagMatcher;
+    }
 
-	public function describeTo( Description $description ) {
-		$description->appendText( 'having root element ' );
-		if ( $this->tagMatcher ) {
-			$description->appendDescriptionOf( $this->tagMatcher );
-		}
-	}
+    public function describeTo( Description $description ) {
+        $description->appendText( 'having root element ' );
+        if ( $this->tagMatcher ) {
+            $description->appendDescriptionOf( $this->tagMatcher );
+        }
+    }
 
-	/**
-	 * @param \DOMDocument $item
-	 * @param Description $mismatchDescription
-	 *
-	 * @return bool
-	 */
-	protected function matchesSafelyWithDiagnosticDescription( $item, Description $mismatchDescription ) {
-		$DOMNodeList = $item->documentElement->childNodes->item( 0 )->childNodes;
-		if ( $DOMNodeList->length > 1 ) {
-			// TODO Test this description
-			$mismatchDescription->appendText( 'having ' . $DOMNodeList->length . ' root elements ' );
-			return false;
-		}
+    /**
+     * @param \DOMDocument $item
+     * @param Description $mismatchDescription
+     *
+     * @return bool
+     */
+    protected function matchesSafelyWithDiagnosticDescription( $item, Description $mismatchDescription ) {
+        $DOMNodeList = $item->documentElement->childNodes->item( 0 )->childNodes;
+        if ( $DOMNodeList->length > 1 ) {
+            // TODO Test this description
+            $mismatchDescription->appendText( 'having ' . $DOMNodeList->length . ' root elements ' );
+            return false;
+        }
 
-		$target = $DOMNodeList->item( 0 );
-		if ( !$target ) {
-			// TODO Reproduce?
-			$mismatchDescription->appendText( 'having no root elements ' );
-			return false;
-		}
+        $target = $DOMNodeList->item( 0 );
+        if ( !$target ) {
+            // TODO Reproduce?
+            $mismatchDescription->appendText( 'having no root elements ' );
+            return false;
+        }
 
-		if ( $this->tagMatcher ) {
-			$mismatchDescription->appendText( 'root element ' );
-			$this->tagMatcher->describeMismatch( $target, $mismatchDescription );
-			return $this->tagMatcher->matches( $target );
-		}
+        if ( $this->tagMatcher ) {
+            $mismatchDescription->appendText( 'root element ' );
+            $this->tagMatcher->describeMismatch( $target, $mismatchDescription );
+            return $this->tagMatcher->matches( $target );
+        }
 
-		return true;
-	}
+        return true;
+    }
 
 }

src/DirectChildElementMatcher.php

Indentation +56 added lines, -56 removed lines

@@ -8,61 +8,61 @@
 
 class DirectChildElementMatcher extends TypeSafeDiagnosingMatcher {
 
-	/**
-	 * @var Matcher
-	 */
-	private $matcher;
-
-	public static function havingDirectChild( Matcher $elementMatcher = null ) {
-		return new static( $elementMatcher );
-	}
-
-	public function __construct( Matcher $matcher = null ) {
-		parent::__construct( \DOMNode::class );
-		$this->matcher = $matcher;
-	}
-
-	public function describeTo( Description $description ) {
-		$description->appendText( 'having direct child ' );
-		if ( $this->matcher ) {
-			$description->appendDescriptionOf( $this->matcher );
-		}
-	}
-
-	/**
-	 * @param \DOMDocument|\DOMNode $item
-	 * @param Description $mismatchDescription
-	 *
-	 * @return bool
-	 */
-	protected function matchesSafelyWithDiagnosticDescription( $item, Description $mismatchDescription ) {
-		if ( $item instanceof \DOMDocument ) {
-			$item = $item->documentElement->childNodes->item( 0 );
-		}
-		$directChildren = $item->childNodes;
-
-		if ( $directChildren->length === 0 ) {
-			$mismatchDescription->appendText( 'with no direct children' );
-			return false;
-		}
-
-		$childWord = $directChildren->length === 1 ? 'child' : 'children';
-
-		$mismatchDescription->appendText( "with direct {$childWord} " );
-
-		if ( !$this->matcher ) {
-			return $directChildren->length !== 0;
-		}
-
-		foreach ( $directChildren as $child ) {
-			if ( $this->matcher->matches( $child ) ) {
-				return true;
-			}
-		}
-
-		$this->matcher->describeMismatch( $child, $mismatchDescription );
-
-		return false;
-	}
+    /**
+     * @var Matcher
+     */
+    private $matcher;
+
+    public static function havingDirectChild( Matcher $elementMatcher = null ) {
+        return new static( $elementMatcher );
+    }
+
+    public function __construct( Matcher $matcher = null ) {
+        parent::__construct( \DOMNode::class );
+        $this->matcher = $matcher;
+    }
+
+    public function describeTo( Description $description ) {
+        $description->appendText( 'having direct child ' );
+        if ( $this->matcher ) {
+            $description->appendDescriptionOf( $this->matcher );
+        }
+    }
+
+    /**
+     * @param \DOMDocument|\DOMNode $item
+     * @param Description $mismatchDescription
+     *
+     * @return bool
+     */
+    protected function matchesSafelyWithDiagnosticDescription( $item, Description $mismatchDescription ) {
+        if ( $item instanceof \DOMDocument ) {
+            $item = $item->documentElement->childNodes->item( 0 );
+        }
+        $directChildren = $item->childNodes;
+
+        if ( $directChildren->length === 0 ) {
+            $mismatchDescription->appendText( 'with no direct children' );
+            return false;
+        }
+
+        $childWord = $directChildren->length === 1 ? 'child' : 'children';
+
+        $mismatchDescription->appendText( "with direct {$childWord} " );
+
+        if ( !$this->matcher ) {
+            return $directChildren->length !== 0;
+        }
+
+        foreach ( $directChildren as $child ) {
+            if ( $this->matcher->matches( $child ) ) {
+                return true;
+            }
+        }
+
+        $this->matcher->describeMismatch( $child, $mismatchDescription );
+
+        return false;
+    }
 
 }

src/ChildElementMatcher.php

Indentation +44 added lines, -44 removed lines

@@ -8,57 +8,57 @@
 
 class ChildElementMatcher extends TypeSafeDiagnosingMatcher {
 
-	/**
-	 * @var Matcher|null
-	 */
-	private $matcher;
+    /**
+     * @var Matcher|null
+     */
+    private $matcher;
 
-	public static function havingChild( Matcher $elementMatcher = null ) {
-		return new static( $elementMatcher );
-	}
+    public static function havingChild( Matcher $elementMatcher = null ) {
+        return new static( $elementMatcher );
+    }
 
-	public function __construct( Matcher $matcher = null ) {
-		parent::__construct( \DOMNode::class );
-		$this->matcher = $matcher;
-	}
+    public function __construct( Matcher $matcher = null ) {
+        parent::__construct( \DOMNode::class );
+        $this->matcher = $matcher;
+    }
 
-	public function describeTo( Description $description ) {
-		$description->appendText( 'having child ' );
-		if ( $this->matcher ) {
-			$description->appendDescriptionOf( $this->matcher );
-		}
-	}
+    public function describeTo( Description $description ) {
+        $description->appendText( 'having child ' );
+        if ( $this->matcher ) {
+            $description->appendDescriptionOf( $this->matcher );
+        }
+    }
 
-	/**
-	 * @param \DOMDocument|\DOMNode $item
-	 * @param Description $mismatchDescription
-	 *
-	 * @return bool
-	 */
-	protected function matchesSafelyWithDiagnosticDescription( $item, Description $mismatchDescription ) {
-		if ( $item instanceof \DOMDocument ) {
-			$directChildren = $item->documentElement->childNodes->item( 0 )->childNodes;
-		} else {
-			$directChildren = $item->childNodes;
-		}
+    /**
+     * @param \DOMDocument|\DOMNode $item
+     * @param Description $mismatchDescription
+     *
+     * @return bool
+     */
+    protected function matchesSafelyWithDiagnosticDescription( $item, Description $mismatchDescription ) {
+        if ( $item instanceof \DOMDocument ) {
+            $directChildren = $item->documentElement->childNodes->item( 0 )->childNodes;
+        } else {
+            $directChildren = $item->childNodes;
+        }
 
-		if ( $directChildren->length === 0 ) {
-			$mismatchDescription->appendText( 'having no children' );
-			return false;
-		}
+        if ( $directChildren->length === 0 ) {
+            $mismatchDescription->appendText( 'having no children' );
+            return false;
+        }
 
-		if ( !$this->matcher ) {
-			return $directChildren->length > 0;
-		}
+        if ( !$this->matcher ) {
+            return $directChildren->length > 0;
+        }
 
-		foreach ( new XmlNodeRecursiveIterator( $directChildren ) as $child ) {
-			if ( $this->matcher->matches( $child ) ) {
-				return true;
-			}
-		}
+        foreach ( new XmlNodeRecursiveIterator( $directChildren ) as $child ) {
+            if ( $this->matcher->matches( $child ) ) {
+                return true;
+            }
+        }
 
-		$mismatchDescription->appendText( 'having no children ' )->appendDescriptionOf( $this->matcher );
-		return false;
-	}
+        $mismatchDescription->appendText( 'having no children ' )->appendDescriptionOf( $this->matcher );
+        return false;
+    }
 
 }

src/ComplexTagMatcher.php

Indentation +182 added lines, -182 removed lines

@@ -10,187 +10,187 @@
 
 class ComplexTagMatcher extends TagMatcher {
 
-	/**
-	 * @link http://www.xmlsoft.org/html/libxml-xmlerror.html#xmlParserErrors
-	 * @link https://github.com/Chronic-Dev/libxml2/blob/683f296a905710ff285c28b8644ef3a3d8be9486/include/libxml/xmlerror.h#L257
-	 */
-	const XML_UNKNOWN_TAG_ERROR_CODE = 801;
-
-	/**
-	 * @var string
-	 */
-	private $tagHtmlOutline;
-
-	/**
-	 * @var Matcher
-	 */
-	private $matcher;
-
-	/**
-	 * @param string $htmlOutline
-	 * @return self
-	 */
-	public static function tagMatchingOutline( $htmlOutline ) {
-		return new self( $htmlOutline );
-	}
-
-	public function __construct( $tagHtmlRepresentation ) {
-		parent::__construct();
-
-		$this->tagHtmlOutline = $tagHtmlRepresentation;
-		$this->matcher = $this->createMatcherFromHtml( $tagHtmlRepresentation );
-	}
-
-	public function describeTo( Description $description ) {
-		$description->appendText( 'tag matching outline `' )
-			->appendText( $this->tagHtmlOutline )
-			->appendText( '` ' );
-	}
-
-	/**
-	 * @param \DOMElement $item
-	 * @param Description $mismatchDescription
-	 *
-	 * @return bool
-	 */
-	protected function matchesSafelyWithDiagnosticDescription( $item, Description $mismatchDescription ) {
-		if ( $this->matcher->matches( $item ) ) {
-			return true;
-		}
-
-		$mismatchDescription->appendText( 'was `' )
-			->appendText( $this->elementToString( $item ) )
-			->appendText( '`' );
-		return false;
-	}
-
-	private function createMatcherFromHtml( $htmlOutline ) {
-		$document = $this->parseHtml( $htmlOutline );
-		$targetTag = $this->getSingleTagFromThe( $document );
-
-		$this->assertTagDoesNotContainChildren( $targetTag );
-
-		$attributeMatchers = $this->createAttributeMatchers( $htmlOutline, $targetTag );
-		$classMatchers = $this->createClassMatchers( $targetTag );
-
-		return AllOf::allOf(
-			new TagNameMatcher( IsEqual::equalTo( $targetTag->tagName ) ),
-			call_user_func_array( [ AllOf::class, 'allOf' ], $attributeMatchers ),
-			call_user_func_array( [ AllOf::class, 'allOf' ], $classMatchers )
-		);
-	}
-
-	private function isUnknownTagError( \LibXMLError $error ) {
-		return $error->code === self::XML_UNKNOWN_TAG_ERROR_CODE;
-	}
-
-	private function isBooleanAttribute( $inputHtml, $attributeName ) {
-		$quotedName = preg_quote( $attributeName, '/' );
-
-		$attributeHasValueAssigned = preg_match( "/\b{$quotedName}\s*=/ui", $inputHtml );
-		return !$attributeHasValueAssigned;
-	}
-
-	/**
-	 * @param $html
-	 *
-	 * @return \DOMDocument
-	 * @throws \InvalidArgumentException
-	 */
-	private function parseHtml( $html ) {
-		$internalErrors = libxml_use_internal_errors( true );
-		$document = new \DOMDocument();
-
-		if ( !@$document->loadHTML( $html ) ) {
-			throw new \InvalidArgumentException( "There was some parsing error of `$html`" );
-		}
-
-		$errors = libxml_get_errors();
-		libxml_clear_errors();
-		libxml_use_internal_errors( $internalErrors );
-
-		/** @var \LibXMLError $error */
-		foreach ( $errors as $error ) {
-			if ( $this->isUnknownTagError( $error ) ) {
-				continue;
-			}
-
-			throw new \InvalidArgumentException(
-				'There was parsing error: ' . trim( $error->message ) . ' on line ' . $error->line
-			);
-		}
-
-		return $document;
-	}
-
-	/**
-	 * @param \DOMDocument $document
-	 *
-	 * @return \DOMElement
-	 * @throws \InvalidArgumentException
-	 */
-	private function getSingleTagFromThe( \DOMDocument $document ) {
-		$directChildren = $document->documentElement->childNodes->item( 0 )->childNodes;
-
-		if ( $directChildren->length !== 1 ) {
-			throw new InvalidArgumentException(
-				'Expected exactly 1 tag description, got ' . $directChildren->length
-			);
-		}
-
-		return $directChildren[0];
-	}
-
-	private function assertTagDoesNotContainChildren( \DOMElement $targetTag ) {
-		if ( $targetTag->childNodes->length > 0 ) {
-			throw new InvalidArgumentException( 'Nested elements are not allowed' );
-		}
-	}
-
-	/**
-	 * @param string $inputHtml
-	 * @param $targetTag
-	 * @return AttributeMatcher[]
-	 */
-	private function createAttributeMatchers( $inputHtml, \DOMElement $targetTag ) {
-		$attributeMatchers = [];
-		/** @var \DOMAttr $attribute */
-		foreach ( $targetTag->attributes as $attribute ) {
-			if ( $attribute->name === 'class' ) {
-				continue;
-			}
-
-			$attributeMatcher = new AttributeMatcher( IsEqual::equalTo( $attribute->name ) );
-			if ( !$this->isBooleanAttribute( $inputHtml, $attribute->name ) ) {
-				$attributeMatcher = $attributeMatcher->havingValue( IsEqual::equalTo( $attribute->value ) );
-			}
-
-			$attributeMatchers[] = $attributeMatcher;
-		}
-		return $attributeMatchers;
-	}
-
-	/**
-	 * @param \DOMElement $targetTag
-	 * @return ClassMatcher[]
-	 */
-	private function createClassMatchers( $targetTag ) {
-		$classMatchers = [];
-		$classValue = $targetTag->getAttribute( 'class' );
-		foreach ( explode( ' ', $classValue ) as $expectedClass ) {
-			if ( $expectedClass === '' ) {
-				continue;
-			}
-			$classMatchers[] = new ClassMatcher( IsEqual::equalTo( $expectedClass ) );
-		}
-		return $classMatchers;
-	}
-
-	private function elementToString( \DOMElement $element ) {
-		$newDocument = new \DOMDocument();
-		$cloned = $element->cloneNode( true );
-		$newDocument->appendChild( $newDocument->importNode( $cloned, true ) );
-		return trim( $newDocument->saveHTML() );
-	}
+    /**
+     * @link http://www.xmlsoft.org/html/libxml-xmlerror.html#xmlParserErrors
+     * @link https://github.com/Chronic-Dev/libxml2/blob/683f296a905710ff285c28b8644ef3a3d8be9486/include/libxml/xmlerror.h#L257
+     */
+    const XML_UNKNOWN_TAG_ERROR_CODE = 801;
+
+    /**
+     * @var string
+     */
+    private $tagHtmlOutline;
+
+    /**
+     * @var Matcher
+     */
+    private $matcher;
+
+    /**
+     * @param string $htmlOutline
+     * @return self
+     */
+    public static function tagMatchingOutline( $htmlOutline ) {
+        return new self( $htmlOutline );
+    }
+
+    public function __construct( $tagHtmlRepresentation ) {
+        parent::__construct();
+
+        $this->tagHtmlOutline = $tagHtmlRepresentation;
+        $this->matcher = $this->createMatcherFromHtml( $tagHtmlRepresentation );
+    }
+
+    public function describeTo( Description $description ) {
+        $description->appendText( 'tag matching outline `' )
+            ->appendText( $this->tagHtmlOutline )
+            ->appendText( '` ' );
+    }
+
+    /**
+     * @param \DOMElement $item
+     * @param Description $mismatchDescription
+     *
+     * @return bool
+     */
+    protected function matchesSafelyWithDiagnosticDescription( $item, Description $mismatchDescription ) {
+        if ( $this->matcher->matches( $item ) ) {
+            return true;
+        }
+
+        $mismatchDescription->appendText( 'was `' )
+            ->appendText( $this->elementToString( $item ) )
+            ->appendText( '`' );
+        return false;
+    }
+
+    private function createMatcherFromHtml( $htmlOutline ) {
+        $document = $this->parseHtml( $htmlOutline );
+        $targetTag = $this->getSingleTagFromThe( $document );
+
+        $this->assertTagDoesNotContainChildren( $targetTag );
+
+        $attributeMatchers = $this->createAttributeMatchers( $htmlOutline, $targetTag );
+        $classMatchers = $this->createClassMatchers( $targetTag );
+
+        return AllOf::allOf(
+            new TagNameMatcher( IsEqual::equalTo( $targetTag->tagName ) ),
+            call_user_func_array( [ AllOf::class, 'allOf' ], $attributeMatchers ),
+            call_user_func_array( [ AllOf::class, 'allOf' ], $classMatchers )
+        );
+    }
+
+    private function isUnknownTagError( \LibXMLError $error ) {
+        return $error->code === self::XML_UNKNOWN_TAG_ERROR_CODE;
+    }
+
+    private function isBooleanAttribute( $inputHtml, $attributeName ) {
+        $quotedName = preg_quote( $attributeName, '/' );
+
+        $attributeHasValueAssigned = preg_match( "/\b{$quotedName}\s*=/ui", $inputHtml );
+        return !$attributeHasValueAssigned;
+    }
+
+    /**
+     * @param $html
+     *
+     * @return \DOMDocument
+     * @throws \InvalidArgumentException
+     */
+    private function parseHtml( $html ) {
+        $internalErrors = libxml_use_internal_errors( true );
+        $document = new \DOMDocument();
+
+        if ( !@$document->loadHTML( $html ) ) {
+            throw new \InvalidArgumentException( "There was some parsing error of `$html`" );
+        }
+
+        $errors = libxml_get_errors();
+        libxml_clear_errors();
+        libxml_use_internal_errors( $internalErrors );
+
+        /** @var \LibXMLError $error */
+        foreach ( $errors as $error ) {
+            if ( $this->isUnknownTagError( $error ) ) {
+                continue;
+            }
+
+            throw new \InvalidArgumentException(
+                'There was parsing error: ' . trim( $error->message ) . ' on line ' . $error->line
+            );
+        }
+
+        return $document;
+    }
+
+    /**
+     * @param \DOMDocument $document
+     *
+     * @return \DOMElement
+     * @throws \InvalidArgumentException
+     */
+    private function getSingleTagFromThe( \DOMDocument $document ) {
+        $directChildren = $document->documentElement->childNodes->item( 0 )->childNodes;
+
+        if ( $directChildren->length !== 1 ) {
+            throw new InvalidArgumentException(
+                'Expected exactly 1 tag description, got ' . $directChildren->length
+            );
+        }
+
+        return $directChildren[0];
+    }
+
+    private function assertTagDoesNotContainChildren( \DOMElement $targetTag ) {
+        if ( $targetTag->childNodes->length > 0 ) {
+            throw new InvalidArgumentException( 'Nested elements are not allowed' );
+        }
+    }
+
+    /**
+     * @param string $inputHtml
+     * @param $targetTag
+     * @return AttributeMatcher[]
+     */
+    private function createAttributeMatchers( $inputHtml, \DOMElement $targetTag ) {
+        $attributeMatchers = [];
+        /** @var \DOMAttr $attribute */
+        foreach ( $targetTag->attributes as $attribute ) {
+            if ( $attribute->name === 'class' ) {
+                continue;
+            }
+
+            $attributeMatcher = new AttributeMatcher( IsEqual::equalTo( $attribute->name ) );
+            if ( !$this->isBooleanAttribute( $inputHtml, $attribute->name ) ) {
+                $attributeMatcher = $attributeMatcher->havingValue( IsEqual::equalTo( $attribute->value ) );
+            }
+
+            $attributeMatchers[] = $attributeMatcher;
+        }
+        return $attributeMatchers;
+    }
+
+    /**
+     * @param \DOMElement $targetTag
+     * @return ClassMatcher[]
+     */
+    private function createClassMatchers( $targetTag ) {
+        $classMatchers = [];
+        $classValue = $targetTag->getAttribute( 'class' );
+        foreach ( explode( ' ', $classValue ) as $expectedClass ) {
+            if ( $expectedClass === '' ) {
+                continue;
+            }
+            $classMatchers[] = new ClassMatcher( IsEqual::equalTo( $expectedClass ) );
+        }
+        return $classMatchers;
+    }
+
+    private function elementToString( \DOMElement $element ) {
+        $newDocument = new \DOMDocument();
+        $cloned = $element->cloneNode( true );
+        $newDocument->appendChild( $newDocument->importNode( $cloned, true ) );
+        return trim( $newDocument->saveHTML() );
+    }
 
 }