elements
*/
class Links extends AbstractHelper
{
/**
* Constants used for specifying which link types to find and render
*
* @var int
*/
const RENDER_ALTERNATE = 0x0001;
const RENDER_STYLESHEET = 0x0002;
const RENDER_START = 0x0004;
const RENDER_NEXT = 0x0008;
const RENDER_PREV = 0x0010;
const RENDER_CONTENTS = 0x0020;
const RENDER_INDEX = 0x0040;
const RENDER_GLOSSARY = 0x0080;
const RENDER_COPYRIGHT = 0x0100;
const RENDER_CHAPTER = 0x0200;
const RENDER_SECTION = 0x0400;
const RENDER_SUBSECTION = 0x0800;
const RENDER_APPENDIX = 0x1000;
const RENDER_HELP = 0x2000;
const RENDER_BOOKMARK = 0x4000;
const RENDER_CUSTOM = 0x8000;
const RENDER_ALL = 0xffff;
/**
* Maps render constants to W3C link types
*
* @var array
*/
protected static $RELATIONS = array(
self::RENDER_ALTERNATE => 'alternate',
self::RENDER_STYLESHEET => 'stylesheet',
self::RENDER_START => 'start',
self::RENDER_NEXT => 'next',
self::RENDER_PREV => 'prev',
self::RENDER_CONTENTS => 'contents',
self::RENDER_INDEX => 'index',
self::RENDER_GLOSSARY => 'glossary',
self::RENDER_COPYRIGHT => 'copyright',
self::RENDER_CHAPTER => 'chapter',
self::RENDER_SECTION => 'section',
self::RENDER_SUBSECTION => 'subsection',
self::RENDER_APPENDIX => 'appendix',
self::RENDER_HELP => 'help',
self::RENDER_BOOKMARK => 'bookmark',
);
/**
* The helper's render flag
*
* @see render()
* @see setRenderFlag()
* @var int
*/
protected $renderFlag = self::RENDER_ALL;
/**
* Root container
*
* Used for preventing methods to traverse above the container given to
* the {@link render()} method.
*
* @see _findRoot()
* @var AbstractContainer
*/
protected $root;
/**
* Helper entry point
*
* @param string|AbstractContainer $container container to operate on
* @return Links
*/
public function __invoke($container = null)
{
if (null !== $container) {
$this->setContainer($container);
}
return $this;
}
/**
* Magic overload: Proxy calls to {@link findRelation()} or container
*
* Examples of finder calls:
*
* // METHOD // SAME AS
* $h->findRelNext($page); // $h->findRelation($page, 'rel', 'next')
* $h->findRevSection($page); // $h->findRelation($page, 'rev', 'section');
* $h->findRelFoo($page); // $h->findRelation($page, 'rel', 'foo');
*
*
* @param string $method
* @param array $arguments
* @return mixed
* @throws Exception\ExceptionInterface
*/
public function __call($method, array $arguments = array())
{
ErrorHandler::start(E_WARNING);
$result = preg_match('/find(Rel|Rev)(.+)/', $method, $match);
ErrorHandler::stop();
if ($result) {
return $this->findRelation($arguments[0], strtolower($match[1]), strtolower($match[2]));
}
return parent::__call($method, $arguments);
}
/**
* Renders helper
*
* Implements {@link HelperInterface::render()}.
*
* @param AbstractContainer|string|null $container [optional] container to render.
* Default is to render the
* container registered in the
* helper.
* @return string
*/
public function render($container = null)
{
$this->parseContainer($container);
if (null === $container) {
$container = $this->getContainer();
}
$active = $this->findActive($container);
if ($active) {
$active = $active['page'];
} else {
// no active page
return '';
}
$output = '';
$indent = $this->getIndent();
$this->root = $container;
$result = $this->findAllRelations($active, $this->getRenderFlag());
foreach ($result as $attrib => $types) {
foreach ($types as $relation => $pages) {
foreach ($pages as $page) {
$r = $this->renderLink($page, $attrib, $relation);
if ($r) {
$output .= $indent . $r . PHP_EOL;
}
}
}
}
$this->root = null;
// return output (trim last newline by spec)
return strlen($output) ? rtrim($output, PHP_EOL) : '';
}
/**
* Renders the given $page as a link element, with $attrib = $relation
*
* @param AbstractPage $page the page to render the link for
* @param string $attrib the attribute to use for $type,
* either 'rel' or 'rev'
* @param string $relation relation type, muse be one of;
* alternate, appendix, bookmark,
* chapter, contents, copyright,
* glossary, help, home, index, next,
* prev, section, start, stylesheet,
* subsection
* @return string
* @throws Exception\DomainException
*/
public function renderLink(AbstractPage $page, $attrib, $relation)
{
if (!in_array($attrib, array('rel', 'rev'))) {
throw new Exception\DomainException(sprintf(
'Invalid relation attribute "%s", must be "rel" or "rev"',
$attrib
));
}
if (!$href = $page->getHref()) {
return '';
}
// TODO: add more attribs
// http://www.w3.org/TR/html401/struct/links.html#h-12.2
$attribs = array(
$attrib => $relation,
'href' => $href,
'title' => $page->getLabel()
);
return 'htmlAttribs($attribs) .
$this->getClosingBracket();
}
// Finder methods:
/**
* Finds all relations (forward and reverse) for the given $page
*
* The form of the returned array:
*
* // $page denotes an instance of Zend\Navigation\Page\AbstractPage
* $returned = array(
* 'rel' => array(
* 'alternate' => array($page, $page, $page),
* 'start' => array($page),
* 'next' => array($page),
* 'prev' => array($page),
* 'canonical' => array($page)
* ),
* 'rev' => array(
* 'section' => array($page)
* )
* );
*
*
* @param AbstractPage $page page to find links for
* @param null|int
* @return array
*/
public function findAllRelations(AbstractPage $page, $flag = null)
{
if (!is_int($flag)) {
$flag = self::RENDER_ALL;
}
$result = array('rel' => array(), 'rev' => array());
$native = array_values(static::$RELATIONS);
foreach (array_keys($result) as $rel) {
$meth = 'getDefined' . ucfirst($rel);
$types = array_merge($native, array_diff($page->$meth(), $native));
foreach ($types as $type) {
if (!$relFlag = array_search($type, static::$RELATIONS)) {
$relFlag = self::RENDER_CUSTOM;
}
if (!($flag & $relFlag)) {
continue;
}
$found = $this->findRelation($page, $rel, $type);
if ($found) {
if (!is_array($found)) {
$found = array($found);
}
$result[$rel][$type] = $found;
}
}
}
return $result;
}
/**
* Finds relations of the given $rel=$type from $page
*
* This method will first look for relations in the page instance, then
* by searching the root container if nothing was found in the page.
*
* @param AbstractPage $page page to find relations for
* @param string $rel relation, "rel" or "rev"
* @param string $type link type, e.g. 'start', 'next'
* @return AbstractPage|array|null
* @throws Exception\DomainException if $rel is not "rel" or "rev"
*/
public function findRelation(AbstractPage $page, $rel, $type)
{
if (!in_array($rel, array('rel', 'rev'))) {
throw new Exception\DomainException(sprintf(
'Invalid argument: $rel must be "rel" or "rev"; "%s" given',
$rel
));
}
if (!$result = $this->findFromProperty($page, $rel, $type)) {
$result = $this->findFromSearch($page, $rel, $type);
}
return $result;
}
/**
* Finds relations of given $type for $page by checking if the
* relation is specified as a property of $page
*
* @param AbstractPage $page page to find relations for
* @param string $rel relation, 'rel' or 'rev'
* @param string $type link type, e.g. 'start', 'next'
* @return AbstractPage|array|null
*/
protected function findFromProperty(AbstractPage $page, $rel, $type)
{
$method = 'get' . ucfirst($rel);
$result = $page->$method($type);
if ($result) {
$result = $this->convertToPages($result);
if ($result) {
if (!is_array($result)) {
$result = array($result);
}
foreach ($result as $key => $page) {
if (!$this->accept($page)) {
unset($result[$key]);
}
}
return count($result) == 1 ? $result[0] : $result;
}
}
return;
}
/**
* Finds relations of given $rel=$type for $page by using the helper to
* search for the relation in the root container
*
* @param AbstractPage $page page to find relations for
* @param string $rel relation, 'rel' or 'rev'
* @param string $type link type, e.g. 'start', 'next', etc
* @return array|null
*/
protected function findFromSearch(AbstractPage $page, $rel, $type)
{
$found = null;
$method = 'search' . ucfirst($rel) . ucfirst($type);
if (method_exists($this, $method)) {
$found = $this->$method($page);
}
return $found;
}
// Search methods:
/**
* Searches the root container for the forward 'start' relation of the given
* $page
*
* From {@link http://www.w3.org/TR/html4/types.html#type-links}:
* Refers to the first document in a collection of documents. This link type
* tells search engines which document is considered by the author to be the
* starting point of the collection.
*
* @param AbstractPage $page
* @return AbstractPage|null
*/
public function searchRelStart(AbstractPage $page)
{
$found = $this->findRoot($page);
if (!$found instanceof AbstractPage) {
$found->rewind();
$found = $found->current();
}
if ($found === $page || !$this->accept($found)) {
$found = null;
}
return $found;
}
/**
* Searches the root container for the forward 'next' relation of the given
* $page
*
* From {@link http://www.w3.org/TR/html4/types.html#type-links}:
* Refers to the next document in a linear sequence of documents. User
* agents may choose to preload the "next" document, to reduce the perceived
* load time.
*
* @param AbstractPage $page
* @return AbstractPage|null
*/
public function searchRelNext(AbstractPage $page)
{
$found = null;
$break = false;
$iterator = new RecursiveIteratorIterator($this->findRoot($page), RecursiveIteratorIterator::SELF_FIRST);
foreach ($iterator as $intermediate) {
if ($intermediate === $page) {
// current page; break at next accepted page
$break = true;
continue;
}
if ($break && $this->accept($intermediate)) {
$found = $intermediate;
break;
}
}
return $found;
}
/**
* Searches the root container for the forward 'prev' relation of the given
* $page
*
* From {@link http://www.w3.org/TR/html4/types.html#type-links}:
* Refers to the previous document in an ordered series of documents. Some
* user agents also support the synonym "Previous".
*
* @param AbstractPage $page
* @return AbstractPage|null
*/
public function searchRelPrev(AbstractPage $page)
{
$found = null;
$prev = null;
$iterator = new RecursiveIteratorIterator(
$this->findRoot($page),
RecursiveIteratorIterator::SELF_FIRST
);
foreach ($iterator as $intermediate) {
if (!$this->accept($intermediate)) {
continue;
}
if ($intermediate === $page) {
$found = $prev;
break;
}
$prev = $intermediate;
}
return $found;
}
/**
* Searches the root container for forward 'chapter' relations of the given
* $page
*
* From {@link http://www.w3.org/TR/html4/types.html#type-links}:
* Refers to a document serving as a chapter in a collection of documents.
*
* @param AbstractPage $page
* @return AbstractPage|array|null
*/
public function searchRelChapter(AbstractPage $page)
{
$found = array();
// find first level of pages
$root = $this->findRoot($page);
// find start page(s)
$start = $this->findRelation($page, 'rel', 'start');
if (!is_array($start)) {
$start = array($start);
}
foreach ($root as $chapter) {
// exclude self and start page from chapters
if ($chapter !== $page &&
!in_array($chapter, $start) &&
$this->accept($chapter)) {
$found[] = $chapter;
}
}
switch (count($found)) {
case 0:
return;
case 1:
return $found[0];
default:
return $found;
}
}
/**
* Searches the root container for forward 'section' relations of the given
* $page
*
* From {@link http://www.w3.org/TR/html4/types.html#type-links}:
* Refers to a document serving as a section in a collection of documents.
*
* @param AbstractPage $page
* @return AbstractPage|array|null
*/
public function searchRelSection(AbstractPage $page)
{
$found = array();
// check if given page has pages and is a chapter page
if ($page->hasPages() && $this->findRoot($page)->hasPage($page)) {
foreach ($page as $section) {
if ($this->accept($section)) {
$found[] = $section;
}
}
}
switch (count($found)) {
case 0:
return;
case 1:
return $found[0];
default:
return $found;
}
}
/**
* Searches the root container for forward 'subsection' relations of the
* given $page
*
* From {@link http://www.w3.org/TR/html4/types.html#type-links}:
* Refers to a document serving as a subsection in a collection of
* documents.
*
* @param AbstractPage $page
* @return AbstractPage|array|null
*/
public function searchRelSubsection(AbstractPage $page)
{
$found = array();
if ($page->hasPages()) {
// given page has child pages, loop chapters
foreach ($this->findRoot($page) as $chapter) {
// is page a section?
if ($chapter->hasPage($page)) {
foreach ($page as $subsection) {
if ($this->accept($subsection)) {
$found[] = $subsection;
}
}
}
}
}
switch (count($found)) {
case 0:
return;
case 1:
return $found[0];
default:
return $found;
}
}
/**
* Searches the root container for the reverse 'section' relation of the
* given $page
*
* From {@link http://www.w3.org/TR/html4/types.html#type-links}:
* Refers to a document serving as a section in a collection of documents.
*
* @param AbstractPage $page
* @return AbstractPage|null
*/
public function searchRevSection(AbstractPage $page)
{
$found = null;
$parent = $page->getParent();
if ($parent) {
if ($parent instanceof AbstractPage &&
$this->findRoot($page)->hasPage($parent)) {
$found = $parent;
}
}
return $found;
}
/**
* Searches the root container for the reverse 'section' relation of the
* given $page
*
* From {@link http://www.w3.org/TR/html4/types.html#type-links}:
* Refers to a document serving as a subsection in a collection of
* documents.
*
* @param AbstractPage $page
* @return AbstractPage|null
*/
public function searchRevSubsection(AbstractPage $page)
{
$found = null;
$parent = $page->getParent();
if ($parent) {
if ($parent instanceof AbstractPage) {
$root = $this->findRoot($page);
foreach ($root as $chapter) {
if ($chapter->hasPage($parent)) {
$found = $parent;
break;
}
}
}
}
return $found;
}
// Util methods:
/**
* Returns the root container of the given page
*
* When rendering a container, the render method still store the given
* container as the root container, and unset it when done rendering. This
* makes sure finder methods will not traverse above the container given
* to the render method.
*
* @param AbstractPage $page
* @return AbstractContainer
*/
protected function findRoot(AbstractPage $page)
{
if ($this->root) {
return $this->root;
}
$root = $page;
while ($parent = $page->getParent()) {
$root = $parent;
if ($parent instanceof AbstractPage) {
$page = $parent;
} else {
break;
}
}
return $root;
}
/**
* Converts a $mixed value to an array of pages
*
* @param mixed $mixed mixed value to get page(s) from
* @param bool $recursive whether $value should be looped
* if it is an array or a config
* @return AbstractPage|array|null
*/
protected function convertToPages($mixed, $recursive = true)
{
if ($mixed instanceof AbstractPage) {
// value is a page instance; return directly
return $mixed;
} elseif ($mixed instanceof AbstractContainer) {
// value is a container; return pages in it
$pages = array();
foreach ($mixed as $page) {
$pages[] = $page;
}
return $pages;
} elseif ($mixed instanceof Traversable) {
$mixed = ArrayUtils::iteratorToArray($mixed);
} elseif (is_string($mixed)) {
// value is a string; make a URI page
return AbstractPage::factory(array(
'type' => 'uri',
'uri' => $mixed
));
}
if (is_array($mixed) && !empty($mixed)) {
if ($recursive && is_numeric(key($mixed))) {
// first key is numeric; assume several pages
$pages = array();
foreach ($mixed as $value) {
$value = $this->convertToPages($value, false);
if ($value) {
$pages[] = $value;
}
}
return $pages;
} else {
// pass array to factory directly
try {
$page = AbstractPage::factory($mixed);
return $page;
} catch (\Exception $e) {
}
}
}
// nothing found
return;
}
/**
* Sets the helper's render flag
*
* The helper uses the bitwise '&' operator against the hex values of the
* render constants. This means that the flag can is "bitwised" value of
* the render constants. Examples:
*
* // render all links except glossary
* $flag = Links:RENDER_ALL ^ Links:RENDER_GLOSSARY;
* $helper->setRenderFlag($flag);
*
* // render only chapters and sections
* $flag = Links:RENDER_CHAPTER | Links:RENDER_SECTION;
* $helper->setRenderFlag($flag);
*
* // render only relations that are not native W3C relations
* $helper->setRenderFlag(Links:RENDER_CUSTOM);
*
* // render all relations (default)
* $helper->setRenderFlag(Links:RENDER_ALL);
*
*
* Note that custom relations can also be rendered directly using the
* {@link renderLink()} method.
*
* @param int $renderFlag
* @return Links
*/
public function setRenderFlag($renderFlag)
{
$this->renderFlag = (int) $renderFlag;
return $this;
}
/**
* Returns the helper's render flag
*
* @return int
*/
public function getRenderFlag()
{
return $this->renderFlag;
}
}