silverstripe-framework/View/SSViewer.php

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<?php
namespace SilverStripe\View;
use SilverStripe\Core\Config\Configurable;
use SilverStripe\Core\ClassInfo;
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use SilverStripe\Core\Cache;
use SilverStripe\Core\Convert;
use SilverStripe\Core\Flushable;
use SilverStripe\Core\Injector\Injector;
use SilverStripe\Control\Director;
use SilverStripe\Dev\Deprecation;
use SilverStripe\ORM\FieldType\DBField;
use SilverStripe\ORM\FieldType\DBHTMLText;
use SilverStripe\Security\Permission;
use InvalidArgumentException;
use Zend_Cache_Backend_ExtendedInterface;
use Zend_Cache;
use Zend_Cache_Core;
/**
* 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>
*
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* Compiled templates are cached via {@link Cache}, usually on the filesystem.
* If you put ?flush=1 on your URL, it will force the template to be recompiled.
*
* @see http://doc.silverstripe.org/themes
* @see http://doc.silverstripe.org/themes:developing
*/
class SSViewer implements Flushable {
use Configurable;
/**
* Identifier for the default theme
*/
const DEFAULT_THEME = '$default';
/**
* @config
* @var boolean $source_file_comments
*/
private static $source_file_comments = false;
/**
* @ignore
*/
private static $template_cache_flushed = false;
/**
* @ignore
*/
private static $cacheblock_cache_flushed = 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
*
* @deprecated 4.0 Use the "SSViewer.source_file_comments" config setting instead
* @param boolean $val
*/
public static function set_source_file_comments($val) {
Deprecation::notice('4.0', 'Use the "SSViewer.source_file_comments" config setting instead');
SSViewer::config()->update('source_file_comments', $val);
}
/**
* @deprecated 4.0 Use the "SSViewer.source_file_comments" config setting instead
* @return boolean
*/
public static function get_source_file_comments() {
Deprecation::notice('4.0', 'Use the "SSViewer.source_file_comments" config setting instead');
return SSViewer::config()->get('source_file_comments');
}
/**
* @var array $templates List of templates to select from
*/
private $templates = null;
/**
* @var string $chosen Absolute path to chosen template file
*/
private $chosen = null;
/**
* @var array Templates to use when looking up 'Layout' or 'Content'
*/
private $subTemplates = null;
/**
* @var boolean
*/
protected $rewriteHashlinks = true;
/**
* @config
* @var string A list (highest priority first) of themes to use
* Only used when {@link $theme_enabled} is set to TRUE.
*/
private static $themes = [];
/**
* @deprecated 4.0..5.0
* @config
* @var string The used "theme", which usually consists of templates, images and stylesheets.
* Only used when {@link $theme_enabled} is set to TRUE, and $themes is empty
*/
private static $theme = null;
/**
* @config
* @var boolean Use the theme. Set to FALSE in order to disable themes,
* which can be useful for scenarios where theme overrides are temporarily undesired,
* such as an administrative interface separate from the website theme.
* It retains the theme settings to be re-enabled, for example when a website content
* needs to be rendered from within this administrative interface.
*/
private static $theme_enabled = true;
/**
* @var boolean
*/
protected $includeRequirements = true;
/**
* @var TemplateParser
*/
protected $parser;
/*
* Default prepended cache key for partial caching
*
* @var string
* @config
*/
private static $global_key = '$CurrentReadingMode, $CurrentUser.ID';
/**
* Triggered early in the request when someone requests a flush.
*/
public static function flush() {
self::flush_template_cache(true);
self::flush_cacheblock_cache(true);
}
/**
* Create a template from a string instead of a .ss file
*
* @param string $content The template content
* @param bool|void $cacheTemplate Whether or not to cache the template from string
* @return SSViewer
*/
public static function fromString($content, $cacheTemplate = null) {
$viewer = new SSViewer_FromString($content);
if ($cacheTemplate !== null) {
$viewer->setCacheTemplate($cacheTemplate);
}
return $viewer;
}
/**
* Assign the list of active themes to apply.
* If default themes should be included add $default as the last entry.
*
* @param array $themes
*/
public static function set_themes($themes = []) {
SSViewer::config()
->remove('themes')
->update('themes', $themes);
}
public static function add_themes($themes = []) {
SSViewer::config()->update('themes', $themes);
}
public static function get_themes() {
$default = [self::DEFAULT_THEME];
if (!SSViewer::config()->get('theme_enabled')) {
return $default;
}
// Explicit list is assigned
if ($list = SSViewer::config()->get('themes')) {
return $list;
}
// Support legacy behaviour
if ($theme = SSViewer::config()->get('theme')) {
return [$theme, self::DEFAULT_THEME];
}
return $default;
}
/**
* @deprecated 4.0 Use the "SSViewer.theme" config setting instead
* @param string $theme The "base theme" name (without underscores).
*/
public static function set_theme($theme) {
Deprecation::notice('4.0', 'Use the "SSViewer#set_themes" instead');
self::set_themes([$theme, self::DEFAULT_THEME]);
}
/**
* Traverses the given the given class context looking for candidate template names
* which match each item in the class hierarchy. The resulting list of template candidates
* may or may not exist, but you can invoke {@see SSViewer::chooseTemplate} on any list
* to determine the best candidate based on the current themes.
*
* @param string|object $classOrObject Valid class name, or object
* @param string $suffix
* @param string $baseClass Class to halt ancestry search at
* @return array
*/
public static function get_templates_by_class($classOrObject, $suffix = '', $baseClass = null) {
// Figure out the class name from the supplied context.
if (!is_object($classOrObject) && !(
is_string($classOrObject) && class_exists($classOrObject)
)) {
throw new InvalidArgumentException(
'SSViewer::get_templates_by_class() expects a valid class name as its first parameter.'
);
}
$templates = array();
$classes = array_reverse(ClassInfo::ancestry($classOrObject));
foreach($classes as $class) {
$template = $class . $suffix;
$templates[] = $template;
$templates[] = ['type' => 'Includes', $template];
// If the class is "Page_Controller", look for Page.ss
if (stripos($class, '_controller') !== false) {
$templates[] = str_ireplace('_controller', '', $class) . $suffix;
}
if($baseClass && $class == $baseClass) {
break;
}
}
return $templates;
}
/**
* @param string|array $templates 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>
* @param TemplateParser $parser
*/
public function __construct($templates, TemplateParser $parser = null) {
if ($parser) {
$this->setParser($parser);
}
$this->setTemplate($templates);
if(!$this->chosen) {
$message = 'None of the following templates could be found: ';
$message .= print_r($templates, true);
$themes = self::get_themes();
if(!$themes) {
$message .= ' (no theme in use)';
} else {
$message .= ' in themes "' . print_r($themes, true) . '"';
}
user_error($message, E_USER_WARNING);
}
}
public function setTemplate($templates) {
$this->templates = $templates;
$this->chosen = $this->chooseTemplate($templates);
$this->subTemplates = [];
}
/**
* Find the template to use for a given list
*
* @param array|string $templates
* @return string
*/
public static function chooseTemplate($templates) {
return ThemeResourceLoader::instance()->findTemplate($templates, self::get_themes());
}
/**
* Set the template parser that will be used in template generation
*
* @param TemplateParser $parser
*/
public function setParser(TemplateParser $parser)
{
$this->parser = $parser;
}
/**
* Returns the parser that is set for template generation
*
* @return TemplateParser
*/
public function getParser()
{
if (!$this->parser) {
$this->setParser(Injector::inst()->get('SilverStripe\\View\\SSTemplateParser'));
}
return $this->parser;
}
/**
* Returns true if at least one of the listed templates exists.
*
* @param array $templates
*
* @return boolean
*/
public static function hasTemplate($templates) {
return (bool)ThemeResourceLoader::instance()->findTemplate($templates, self::get_themes());
}
/**
* 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.
*
* @deprecated 4.0 Use the "SSViewer.rewrite_hash_links" config setting instead
* @param string $optionName
* @param mixed $optionVal
*/
public static function setOption($optionName, $optionVal) {
if($optionName == 'rewriteHashlinks') {
Deprecation::notice('4.0', 'Use the "SSViewer.rewrite_hash_links" config setting instead');
SSViewer::config()->update('rewrite_hash_links', $optionVal);
} else {
Deprecation::notice('4.0', 'Use the "SSViewer.' . $optionName . '" config setting instead');
SSViewer::config()->update($optionName, $optionVal);
}
}
/**
* @deprecated 4.0 Use the "SSViewer.rewrite_hash_links" config setting instead
* @param string
* @return mixed
*/
public static function getOption($optionName) {
if($optionName == 'rewriteHashlinks') {
Deprecation::notice('4.0', 'Use the "SSViewer.rewrite_hash_links" config setting instead');
return SSViewer::config()->get('rewrite_hash_links');
} else {
Deprecation::notice('4.0', 'Use the "SSViewer.' . $optionName . '" config setting instead');
return SSViewer::config()->get($optionName);
}
}
/**
* @config
* @var boolean
*/
private static $rewrite_hash_links = true;
protected static $topLevel = array();
public static function topLevel() {
if(SSViewer::$topLevel) {
return SSViewer::$topLevel[sizeof(SSViewer::$topLevel)-1];
}
return null;
}
/**
* 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;
SSViewer::config()->update('rewrite_hash_links', false);
return $this;
}
public function exists() {
return $this->chosen;
}
/**
* @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 = null) {
return ThemeResourceLoader::instance()->findTemplate(['type' => $type, $identifier], self::get_themes());
}
/**
* Clears all parsed template files in the cache folder.
*
* Can only be called once per request (there may be multiple SSViewer instances).
*
* @param bool $force Set this to true to force a re-flush. If left to false, flushing
* may only be performed once a request.
*/
public static function flush_template_cache($force = false) {
if (!self::$template_cache_flushed || $force) {
$dir = dir(TEMP_FOLDER);
while (false !== ($file = $dir->read())) {
if (strstr($file, '.cache')) unlink(TEMP_FOLDER . '/' . $file);
}
self::$template_cache_flushed = true;
}
}
/**
* Clears all partial cache blocks.
*
* Can only be called once per request (there may be multiple SSViewer instances).
*
* @param bool $force Set this to true to force a re-flush. If left to false, flushing
* may only be performed once a request.
*/
public static function flush_cacheblock_cache($force = false) {
if (!self::$cacheblock_cache_flushed || $force) {
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$cache = Cache::factory('cacheblock');
$backend = $cache->getBackend();
if(
$backend instanceof Zend_Cache_Backend_ExtendedInterface
&& ($capabilities = $backend->getCapabilities())
&& $capabilities['tags']
) {
$cache->clean(Zend_Cache::CLEANING_MODE_MATCHING_TAG, $cache->getTags());
} else {
$cache->clean(Zend_Cache::CLEANING_MODE_ALL);
}
self::$cacheblock_cache_flushed = true;
}
}
/**
* @var Zend_Cache_Core
*/
protected $partialCacheStore = null;
/**
* Set the cache object to use when storing / retrieving partial cache blocks.
*
* @param Zend_Cache_Core $cache
*/
public function setPartialCacheStore($cache) {
$this->partialCacheStore = $cache;
}
/**
* Get the cache object to use when storing / retrieving partial cache blocks.
*
* @return Zend_Cache_Core
*/
public function getPartialCacheStore() {
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return $this->partialCacheStore ? $this->partialCacheStore : Cache::factory('cacheblock');
}
/**
* Flag whether to include the requirements in this response.
*
* @param boolean
*/
public function includeRequirements($incl = true) {
$this->includeRequirements = $incl;
}
/**
* An internal utility function to set up variables in preparation for including a compiled
* template, then do the include
*
* Effectively this is the common code that both SSViewer#process and SSViewer_FromString#process call
*
* @param string $cacheFile The path to the file that contains the template compiled to PHP
* @param ViewableData $item The item to use as the root scope for the template
* @param array $overlay Any variables to layer on top of the scope
* @param array $underlay Any variables to layer underneath the scope
* @param ViewableData $inheritedScope The current scope of a parent template including a sub-template
* @return string The result of executing the template
*/
protected function includeGeneratedTemplate($cacheFile, $item, $overlay, $underlay, $inheritedScope = null) {
if(isset($_GET['showtemplate']) && $_GET['showtemplate'] && Permission::check('ADMIN')) {
$lines = file($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>";
}
$cache = $this->getPartialCacheStore();
$scope = new SSViewer_DataPresenter($item, $overlay, $underlay, $inheritedScope);
$val = '';
include($cacheFile);
return $val;
}
/**
* The process() method handles the "meat" of the template processing.
*
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* It takes care of caching the output (via {@link Cache}), as well as
* replacing the special "$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 array|null $arguments Arguments to an included template
* @param ViewableData $inheritedScope The current scope of a parent template including a sub-template
* @return DBHTMLText Parsed template output.
*/
public function process($item, $arguments = null, $inheritedScope = null) {
SSViewer::$topLevel[] = $item;
$template = $this->chosen;
$cacheFile = TEMP_FOLDER . "/.cache"
. str_replace(array('\\','/',':'), '.', Director::makeRelative(realpath($template)));
$lastEdited = filemtime($template);
if(!file_exists($cacheFile) || filemtime($cacheFile) < $lastEdited) {
$content = file_get_contents($template);
$content = $this->parseTemplateContent($content, $template);
$fh = fopen($cacheFile,'w');
fwrite($fh, $content);
fclose($fh);
}
$underlay = array('I18NNamespace' => basename($template));
// Makes the rendered sub-templates available on the parent item,
// through $Content and $Layout placeholders.
foreach(array('Content', 'Layout') as $subtemplate) {
$sub = null;
if(isset($this->subTemplates[$subtemplate])) {
$sub = $this->subTemplates[$subtemplate];
}
elseif(!is_array($this->templates)) {
$sub = ['type' => $subtemplate, $this->templates];
}
elseif(!array_key_exists('type', $this->templates) || !$this->templates['type']) {
$sub = array_merge($this->templates, ['type' => $subtemplate]);
}
if ($sub) {
$subtemplateViewer = clone $this;
// Disable requirements - this will be handled by the parent template
$subtemplateViewer->includeRequirements(false);
// Select the right template
$subtemplateViewer->setTemplate($sub);
if ($subtemplateViewer->exists()) {
$underlay[$subtemplate] = $subtemplateViewer->process($item, $arguments);
}
}
}
$output = $this->includeGeneratedTemplate($cacheFile, $item, $arguments, $underlay, $inheritedScope);
if($this->includeRequirements) {
$output = Requirements::includeInHTML($output);
}
array_pop(SSViewer::$topLevel);
// If we have our crazy base tag, then fix # links referencing the current page.
$rewrite = SSViewer::config()->get('rewrite_hash_links');
if($this->rewriteHashlinks && $rewrite) {
if(strpos($output, '<base') !== false) {
if($rewrite === 'php') {
$thisURLRelativeToBase = "<?php echo \\SilverStripe\\Core\\Convert::raw2att(preg_replace(\"/^(\\\\/)+/\", \"/\", \$_SERVER['REQUEST_URI'])); ?>";
} else {
$thisURLRelativeToBase = Convert::raw2att(preg_replace("/^(\\/)+/", "/", $_SERVER['REQUEST_URI']));
}
$output = preg_replace('/(<a[^>]+href *= *)"#/i', '\\1"' . $thisURLRelativeToBase . '#', $output);
}
}
return DBField::create_field('HTMLFragment', $output);
}
/**
* Execute the given template, passing it the given data.
* Used by the <% include %> template tag to process templates.
*
* @param string $template Template name
* @param mixed $data Data context
* @param array $arguments Additional arguments
* @param Object $scope
* @return string Evaluated result
*/
public static function execute_template($template, $data, $arguments = null, $scope = null) {
$v = new SSViewer($template);
$v->includeRequirements(false);
return $v->process($data, $arguments, $scope);
}
/**
* Execute the evaluated string, passing it the given data.
* Used by partial caching to evaluate custom cache keys expressed using
* template expressions
*
* @param string $content Input string
* @param mixed $data Data context
* @param array $arguments Additional arguments
* @return string Evaluated result
*/
public static function execute_string($content, $data, $arguments = null) {
$v = SSViewer::fromString($content);
$v->includeRequirements(false);
return $v->process($data, $arguments);
}
public function parseTemplateContent($content, $template="") {
return $this->getParser()->compileString(
$content,
$template,
Director::isDev() && SSViewer::config()->get('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 array_merge(['main' => $this->chosen], $this->subTemplates);
}
/**
* @param string $type "Layout" or "main"
* @param string $file Full system path to the template file
*/
public function setTemplateFile($type, $file) {
if (!$type || $type == 'main') $this->chosen = $file;
else $this->subTemplates[$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 string $contentGeneratedSoFar The content of the template generated so far; it should contain
* the DOCTYPE declaration.
* @return string
*/
public static function get_base_tag($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]-->";
}
}
}