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<?php
/**
* This tracks the current scope for an SSViewer instance. It has three goals:
* - Handle entering & leaving sub-scopes in loops and withs
* - Track Up and Top
* - (As a side effect) Inject data that needs to be available globally (used to live in ViewableData)
*
* In order to handle up, rather than tracking it using a tree, which would involve constructing new objects
* for each step, we use indexes into the itemStack (which already has to exist).
*
* Each item has three indexes associated with it
*
* - Pop. Which item should become the scope once the current scope is popped out of
* - Up. Which item is up from this item
* - Current. Which item is the first time this object has appeared in the stack
*
* We also keep the index of the current starting point for lookups. A lookup is a sequence of obj calls -
* when in a loop or with tag the end result becomes the new scope, but for injections, we throw away the lookup
* and revert back to the original scope once we've got the value we're after
*
*/
class SSViewer_Scope {
// The stack of previous "global" items
// And array of item, itemIterator, pop_index, up_index, current_index
private $itemStack = array();
private $item; // The current "global" item (the one any lookup starts from)
private $itemIterator; // If we're looping over the current "global" item, here's the iterator that tracks with item we're up to
private $popIndex; // A pointer into the item stack for which item should be scope on the next pop call
private $upIndex; // A pointer into the item stack for which item is "up" from this one
private $currentIndex; // A pointer into the item stack for which item is this one (or null if not in stack yet)
private $localIndex;
function __construct($item){
$this->item = $item;
$this->localIndex=0;
$this->itemStack[] = array($this->item, null, null, null, 0);
}
function getItem(){
return $this->itemIterator ? $this->itemIterator->current() : $this->item;
}
function resetLocalScope(){
list($this->item, $this->itemIterator, $this->popIndex, $this->upIndex, $this->currentIndex) = $this->itemStack[$this->localIndex];
array_splice($this->itemStack, $this->localIndex+1);
}
function obj($name){
switch ($name) {
case 'Up':
list($this->item, $this->itemIterator, $unused2, $this->upIndex, $this->currentIndex) = $this->itemStack[$this->upIndex];
break;
case 'Top':
list($this->item, $this->itemIterator, $unused2, $this->upIndex, $this->currentIndex) = $this->itemStack[0];
break;
default:
$on = $this->itemIterator ? $this->itemIterator->current() : $this->item;
$arguments = func_get_args();
$this->item = call_user_func_array(array($on, 'obj'), $arguments);
$this->itemIterator = null;
$this->upIndex = $this->currentIndex ? $this->currentIndex : count($this->itemStack)-1;
$this->currentIndex = count($this->itemStack);
break;
}
$this->itemStack[] = array($this->item, $this->itemIterator, null, $this->upIndex, $this->currentIndex);
return $this;
}
function pushScope(){
$newLocalIndex = count($this->itemStack)-1;
$this->popIndex = $this->itemStack[$newLocalIndex][2] = $this->localIndex;
$this->localIndex = $newLocalIndex;
// We normally keep any previous itemIterator around, so local $Up calls reference the right element. But
// once we enter a new global scope, we need to make sure we use a new one
$this->itemIterator = $this->itemStack[$newLocalIndex][1] = null;
return $this;
}
function popScope(){
$this->localIndex = $this->popIndex;
$this->resetLocalScope();
return $this;
}
function next(){
if (!$this->item) return false;
if (!$this->itemIterator) {
if (is_array($this->item)) $this->itemIterator = new ArrayIterator($this->item);
else $this->itemIterator = $this->item->getIterator();
$this->itemStack[$this->localIndex][1] = $this->itemIterator;
$this->itemIterator->rewind();
}
else {
$this->itemIterator->next();
}
$this->resetLocalScope();
if (!$this->itemIterator->valid()) return false;
return $this->itemIterator->key();
}
function __call($name, $arguments) {
$on = $this->itemIterator ? $this->itemIterator->current() : $this->item;
$retval = call_user_func_array(array($on, $name), $arguments);
$this->resetLocalScope();
return $retval;
}
}
/**
* This extends SSViewer_Scope to mix in data on top of what the item provides. This can be "global"
* data that is scope-independant (like BaseURL), or type-specific data that is layered on top cross-cut like
* (like $FirstLast etc).
*
* It's separate from SSViewer_Scope to keep that fairly complex code as clean as possible.
*/
class SSViewer_DataPresenter extends SSViewer_Scope {
private $extras;
function __construct($item, $extras = null){
parent::__construct($item);
$this->extras = $extras;
}
function __call($name, $arguments) {
$property = $arguments[0];
if ($this->extras && array_key_exists($property, $this->extras)) {
$this->resetLocalScope();
$value = $this->extras[$arguments[0]];
switch ($name) {
case 'hasValue':
return (bool)$value;
default:
return $value;
}
}
return parent::__call($name, $arguments);
}
}
/**
* Parses a template file with an *.ss file extension.
*
* In addition to a full template in the templates/ folder, a template in
* templates/Content or templates/Layout will be rendered into $Content and
* $Layout, respectively.
*
* A single template can be parsed by multiple nested {@link SSViewer} instances
* through $Layout/$Content placeholders, as well as <% include MyTemplateFile %> template commands.
*
* <b>Themes</b>
*
* See http://doc.silverstripe.org/themes and http://doc.silverstripe.org/themes:developing
*
* <b>Caching</b>
*
* Compiled templates are cached via {@link SS_Cache}, usually on the filesystem.
* If you put ?flush=all on your URL, it will force the template to be recompiled.
*
* @see http://doc.silverstripe.org/themes
* @see http://doc.silverstripe.org/themes:developing
*
* @package sapphire
* @subpackage view
*/
class SSViewer {
/**
* @var boolean $source_file_comments
*/
protected static $source_file_comments = false;
/**
* Set whether HTML comments indicating the source .SS file used to render this page should be
* included in the output. This is enabled by default
*
* @param boolean $val
*/
static function set_source_file_comments($val) {
self::$source_file_comments = $val;
}
/**
* @return boolean
*/
static function get_source_file_comments() {
return self::$source_file_comments;
}
/**
* @var array $chosenTemplates Associative array for the different
* template containers: "main" and "Layout". Values are absolute file paths to *.ss files.
*/
private $chosenTemplates = array();
/**
* @var boolean
*/
protected $rewriteHashlinks = true;
/**
* @var string
*/
protected static $current_theme = null;
/**
* @var string
*/
protected static $current_custom_theme = null;
/**
* Create a template from a string instead of a .ss file
*
* @return SSViewer
*/
static function fromString($content) {
return new SSViewer_FromString($content);
}
/**
* @param string $theme The "base theme" name (without underscores).
*/
static function set_theme($theme) {
self::$current_theme = $theme;
//Static publishing needs to have a theme set, otherwise it defaults to the content controller theme
if(!is_null($theme))
self::$current_custom_theme=$theme;
}
/**
* @return string
*/
static function current_theme() {
return self::$current_theme;
}
/**
* Returns the path to the theme folder
*
* @return String
*/
static function get_theme_folder() {
return self::current_theme() ? THEMES_DIR . "/" . self::current_theme() : project();
}
/**
* Returns an array of theme names present in a directory.
*
* @param string $path
* @param bool $subthemes Include subthemes (default false).
* @return array
*/
public static function get_themes($path = null, $subthemes = false) {
$path = rtrim($path ? $path : THEMES_PATH, '/');
$themes = array();
if (!is_dir($path)) return $themes;
foreach (scandir($path) as $item) {
if ($item[0] != '.' && is_dir("$path/$item")) {
if ($subthemes || !strpos($item, '_')) {
$themes[$item] = $item;
}
}
}
return $themes;
}
/**
* @return string
*/
static function current_custom_theme(){
return self::$current_custom_theme;
}
/**
* @param string|array $templateList If passed as a string with .ss extension, used as the "main" template.
* If passed as an array, it can be used for template inheritance (first found template "wins").
* Usually the array values are PHP class names, which directly correlate to template names.
* <code>
* array('MySpecificPage', 'MyPage', 'Page')
* </code>
*/
public function __construct($templateList) {
// flush template manifest cache if requested
if (isset($_GET['flush']) && $_GET['flush'] == 'all') {
if(Director::isDev() || Director::is_cli() || Permission::check('ADMIN')) {
self::flush_template_cache();
} else {
return Security::permissionFailure(null, 'Please log in as an administrator to flush the template cache.');
}
}
if(substr((string) $templateList,-3) == '.ss') {
$this->chosenTemplates['main'] = $templateList;
} else {
$this->chosenTemplates = SS_TemplateLoader::instance()->findTemplates(
$templateList, self::current_theme()
);
}
if(!$this->chosenTemplates) user_error("None of these templates can be found in theme '"
. self::current_theme() . "': ". implode(".ss, ", $templateList) . ".ss", E_USER_WARNING);
}
/**
* Returns true if at least one of the listed templates exists
*/
public static function hasTemplate($templates) {
$manifest = SS_TemplateLoader::instance()->getManifest();
foreach ((array) $templates as $template) {
if ($manifest->getTemplate($template)) return true;
}
return false;
}
/**
* Set a global rendering option.
* The following options are available:
* - rewriteHashlinks: If true (the default), <a href="#..."> will be rewritten to contain the
* current URL. This lets it play nicely with our <base> tag.
* - If rewriteHashlinks = 'php' then, a piece of PHP script will be inserted before the hash
* links: "<?php echo $_SERVER['REQUEST_URI']; ?>". This is useful if you're generating a
* page that will be saved to a .php file and may be accessed from different URLs.
*/
public static function setOption($optionName, $optionVal) {
SSViewer::$options[$optionName] = $optionVal;
}
protected static $options = array(
'rewriteHashlinks' => true,
);
protected static $topLevel = array();
public static function topLevel() {
if(SSViewer::$topLevel) {
return SSViewer::$topLevel[sizeof(SSViewer::$topLevel)-1];
}
}
/**
* Call this to disable rewriting of <a href="#xxx"> links. This is useful in Ajax applications.
* It returns the SSViewer objects, so that you can call new SSViewer("X")->dontRewriteHashlinks()->process();
*/
public function dontRewriteHashlinks() {
$this->rewriteHashlinks = false;
self::$options['rewriteHashlinks'] = false;
return $this;
}
public function exists() {
return $this->chosenTemplates;
}
/**
* @param string $identifier A template name without '.ss' extension or path
* @param string $type The template type, either "main", "Includes" or "Layout"
* @return string Full system path to a template file
*/
public static function getTemplateFileByType($identifier, $type) {
$loader = SS_TemplateLoader::instance();
$found = $loader->findTemplates("$type/$identifier", self::current_theme());
if ($found) {
return $found['main'];
}
}
/**
* @ignore
*/
static private $flushed = false;
/**
* Clears all parsed template files in the cache folder.
*
* Can only be called once per request (there may be multiple SSViewer instances).
*/
static function flush_template_cache() {
if (!self::$flushed) {
$dir = dir(TEMP_FOLDER);
while (false !== ($file = $dir->read())) {
if (strstr($file, '.cache')) { unlink(TEMP_FOLDER.'/'.$file); }
}
self::$flushed = true;
}
}
/**
* The process() method handles the "meat" of the template processing.
* It takes care of caching the output (via {@link SS_Cache}),
* as well as replacing the special "$Content" and "$Layout"
* placeholders with their respective subtemplates.
* The method injects extra HTML in the header via {@link Requirements::includeInHTML()}.
*
* Note: You can call this method indirectly by {@link ViewableData->renderWith()}.
*
* @param ViewableData $item
* @param SS_Cache $cache Optional cache backend
* @return String Parsed template output.
*/
public function process($item, $cache = null) {
SSViewer::$topLevel[] = $item;
if (!$cache) $cache = SS_Cache::factory('cacheblock');
if(isset($this->chosenTemplates['main'])) {
$template = $this->chosenTemplates['main'];
} else {
$template = $this->chosenTemplates[ reset($dummy = array_keys($this->chosenTemplates)) ];
}
if(isset($_GET['debug_profile'])) Profiler::mark("SSViewer::process", " for $template");
$cacheFile = TEMP_FOLDER . "/.cache" . str_replace(array('\\','/',':'), '.', Director::makeRelative(realpath($template)));
$lastEdited = filemtime($template);
if(!file_exists($cacheFile) || filemtime($cacheFile) < $lastEdited || isset($_GET['flush'])) {
if(isset($_GET['debug_profile'])) Profiler::mark("SSViewer::process - compile", " for $template");
$content = file_get_contents($template);
$content = SSViewer::parseTemplateContent($content, $template);
$fh = fopen($cacheFile,'w');
fwrite($fh, $content);
fclose($fh);
if(isset($_GET['debug_profile'])) Profiler::unmark("SSViewer::process - compile", " for $template");
}
if(isset($_GET['showtemplate']) && !Director::isLive()) {
$lines = file($cacheFile);
echo "<h2>Template: $cacheFile</h2>";
echo "<pre>";
foreach($lines as $num => $line) {
echo str_pad($num+1,5) . htmlentities($line, ENT_COMPAT, 'UTF-8');
}
echo "</pre>";
}
// Makes the rendered sub-templates available on the parent item,
// through $Content and $Layout placeholders.
foreach(array('Content', 'Layout') as $subtemplate) {
if(isset($this->chosenTemplates[$subtemplate])) {
$subtemplateViewer = new SSViewer($this->chosenTemplates[$subtemplate]);
$item = $item->customise(array(
$subtemplate => $subtemplateViewer->process($item, $cache)
));
}
}
$scope = new SSViewer_DataPresenter($item, array('I18NNamespace' => basename($template)));
$val = "";
include($cacheFile);
$output = Requirements::includeInHTML($template, $val);
array_pop(SSViewer::$topLevel);
if(isset($_GET['debug_profile'])) Profiler::unmark("SSViewer::process", " for $template");
// If we have our crazy base tag, then fix # links referencing the current page.
if($this->rewriteHashlinks && self::$options['rewriteHashlinks']) {
if(strpos($output, '<base') !== false) {
if(SSViewer::$options['rewriteHashlinks'] === 'php') {
$thisURLRelativeToBase = "<?php echo \$_SERVER['REQUEST_URI']; ?>";
} else {
$thisURLRelativeToBase = Director::makeRelative(Director::absoluteURL($_SERVER['REQUEST_URI']));
}
$output = preg_replace('/(<a[^>]+href *= *)"#/i', '\\1"' . $thisURLRelativeToBase . '#', $output);
}
}
return $output;
}
/**
* Execute the given template, passing it the given data.
* Used by the <% include %> template tag to process templates.
*/
static function execute_template($template, $data) {
$v = new SSViewer($template);
return $v->process($data);
}
static function parseTemplateContent($content, $template="") {
return SSTemplateParser::compileString($content, $template, Director::isDev() && self::$source_file_comments);
}
/**
* Returns the filenames of the template that will be rendered. It is a map that may contain
* 'Content' & 'Layout', and will have to contain 'main'
*/
public function templates() {
return $this->chosenTemplates;
}
/**
* @param string $type "Layout" or "main"
* @param string $file Full system path to the template file
*/
public function setTemplateFile($type, $file) {
$this->chosenTemplates[$type] = $file;
}
/**
* Return an appropriate base tag for the given template.
* It will be closed on an XHTML document, and unclosed on an HTML document.
*
* @param $contentGeneratedSoFar The content of the template generated so far; it should contain
* the DOCTYPE declaration.
*/
static function get_base_tag($contentGeneratedSoFar) {
$base = Director::absoluteBaseURL();
// Is the document XHTML?
if(preg_match('/<!DOCTYPE[^>]+xhtml/i', $contentGeneratedSoFar)) {
return "<base href=\"$base\" />";
} else {
return "<base href=\"$base\"><!--[if lte IE 6]></base><![endif]-->";
}
}
}
/**
* Special SSViewer that will process a template passed as a string, rather than a filename.
* @package sapphire
* @subpackage view
*/
class SSViewer_FromString extends SSViewer {
protected $content;
public function __construct($content) {
$this->content = $content;
}
public function process($item, $cache = null) {
$template = SSViewer::parseTemplateContent($this->content, "string sha1=".sha1($this->content));
$tmpFile = tempnam(TEMP_FOLDER,"");
$fh = fopen($tmpFile, 'w');
fwrite($fh, $template);
fclose($fh);
if(isset($_GET['showtemplate']) && $_GET['showtemplate']) {
$lines = file($tmpFile);
echo "<h2>Template: $tmpFile</h2>";
echo "<pre>";
foreach($lines as $num => $line) {
echo str_pad($num+1,5) . htmlentities($line, ENT_COMPAT, 'UTF-8');
}
echo "</pre>";
}
$scope = new SSViewer_DataPresenter($item);
$val = "";
$valStack = array();
$cache = SS_Cache::factory('cacheblock');
include($tmpFile);
unlink($tmpFile);
return $val;
}
}
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