mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-09-05 09:11:25 +02:00
695 lines
21 KiB
PHP
695 lines
21 KiB
PHP
<?php
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namespace SilverStripe\View;
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use SilverStripe\Core\Config\Configurable;
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use SilverStripe\Core\ClassInfo;
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use SilverStripe\Core\Cache;
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use SilverStripe\Core\Convert;
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use SilverStripe\Core\Flushable;
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use SilverStripe\Core\Injector\Injector;
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use SilverStripe\Control\Director;
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use SilverStripe\Dev\Deprecation;
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use SilverStripe\ORM\FieldType\DBField;
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use SilverStripe\ORM\FieldType\DBHTMLText;
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use SilverStripe\Security\Permission;
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use InvalidArgumentException;
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use Zend_Cache_Backend_ExtendedInterface;
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use Zend_Cache;
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use Zend_Cache_Core;
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/**
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* Parses a template file with an *.ss file extension.
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*
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* In addition to a full template in the templates/ folder, a template in
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* templates/Content or templates/Layout will be rendered into $Content and
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* $Layout, respectively.
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*
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* A single template can be parsed by multiple nested {@link SSViewer} instances
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* through $Layout/$Content placeholders, as well as <% include MyTemplateFile %> template commands.
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*
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* <b>Themes</b>
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*
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* See http://doc.silverstripe.org/themes and http://doc.silverstripe.org/themes:developing
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*
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* <b>Caching</b>
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*
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* Compiled templates are cached via {@link Cache}, usually on the filesystem.
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* If you put ?flush=1 on your URL, it will force the template to be recompiled.
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*
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* @see http://doc.silverstripe.org/themes
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* @see http://doc.silverstripe.org/themes:developing
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*/
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class SSViewer implements Flushable {
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use Configurable;
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/**
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* Identifier for the default theme
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*/
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const DEFAULT_THEME = '$default';
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/**
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* @config
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* @var boolean $source_file_comments
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*/
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private static $source_file_comments = false;
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/**
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* @ignore
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*/
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private static $template_cache_flushed = false;
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/**
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* @ignore
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*/
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private static $cacheblock_cache_flushed = false;
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/**
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* Set whether HTML comments indicating the source .SS file used to render this page should be
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* included in the output. This is enabled by default
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*
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* @deprecated 4.0 Use the "SSViewer.source_file_comments" config setting instead
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* @param boolean $val
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*/
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public static function set_source_file_comments($val) {
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Deprecation::notice('4.0', 'Use the "SSViewer.source_file_comments" config setting instead');
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SSViewer::config()->update('source_file_comments', $val);
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}
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/**
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* @deprecated 4.0 Use the "SSViewer.source_file_comments" config setting instead
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* @return boolean
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*/
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public static function get_source_file_comments() {
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Deprecation::notice('4.0', 'Use the "SSViewer.source_file_comments" config setting instead');
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return SSViewer::config()->get('source_file_comments');
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}
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/**
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* @var array $templates List of templates to select from
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*/
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private $templates = null;
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/**
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* @var string $chosen Absolute path to chosen template file
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*/
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private $chosen = null;
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/**
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* @var array Templates to use when looking up 'Layout' or 'Content'
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*/
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private $subTemplates = null;
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/**
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* @var boolean
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*/
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protected $rewriteHashlinks = true;
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/**
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* @config
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* @var string A list (highest priority first) of themes to use
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* Only used when {@link $theme_enabled} is set to TRUE.
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*/
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private static $themes = [];
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/**
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* @deprecated 4.0..5.0
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* @config
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* @var string The used "theme", which usually consists of templates, images and stylesheets.
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* Only used when {@link $theme_enabled} is set to TRUE, and $themes is empty
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*/
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private static $theme = null;
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/**
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* @config
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* @var boolean Use the theme. Set to FALSE in order to disable themes,
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* which can be useful for scenarios where theme overrides are temporarily undesired,
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* such as an administrative interface separate from the website theme.
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* It retains the theme settings to be re-enabled, for example when a website content
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* needs to be rendered from within this administrative interface.
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*/
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private static $theme_enabled = true;
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/**
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* @var boolean
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*/
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protected $includeRequirements = true;
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/**
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* @var TemplateParser
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*/
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protected $parser;
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/*
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* Default prepended cache key for partial caching
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*
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* @var string
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* @config
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*/
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private static $global_key = '$CurrentReadingMode, $CurrentUser.ID';
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/**
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* Triggered early in the request when someone requests a flush.
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*/
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public static function flush() {
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self::flush_template_cache(true);
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self::flush_cacheblock_cache(true);
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}
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/**
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* Create a template from a string instead of a .ss file
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*
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* @param string $content The template content
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* @param bool|void $cacheTemplate Whether or not to cache the template from string
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* @return SSViewer
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*/
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public static function fromString($content, $cacheTemplate = null) {
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$viewer = new SSViewer_FromString($content);
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if ($cacheTemplate !== null) {
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$viewer->setCacheTemplate($cacheTemplate);
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}
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return $viewer;
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}
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/**
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* Assign the list of active themes to apply.
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* If default themes should be included add $default as the last entry.
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*
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* @param array $themes
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*/
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public static function set_themes($themes = []) {
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SSViewer::config()
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->remove('themes')
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->update('themes', $themes);
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}
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public static function add_themes($themes = []) {
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SSViewer::config()->update('themes', $themes);
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}
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public static function get_themes() {
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$default = [self::DEFAULT_THEME];
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if (!SSViewer::config()->get('theme_enabled')) {
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return $default;
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}
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// Explicit list is assigned
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if ($list = SSViewer::config()->get('themes')) {
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return $list;
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}
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// Support legacy behaviour
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if ($theme = SSViewer::config()->get('theme')) {
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return [$theme, self::DEFAULT_THEME];
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}
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return $default;
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}
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/**
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* @deprecated 4.0 Use the "SSViewer.theme" config setting instead
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* @param string $theme The "base theme" name (without underscores).
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*/
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public static function set_theme($theme) {
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Deprecation::notice('4.0', 'Use the "SSViewer#set_themes" instead');
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self::set_themes([$theme, self::DEFAULT_THEME]);
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}
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/**
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* Traverses the given the given class context looking for candidate template names
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* which match each item in the class hierarchy. The resulting list of template candidates
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* may or may not exist, but you can invoke {@see SSViewer::chooseTemplate} on any list
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* to determine the best candidate based on the current themes.
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*
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* @param string|object $classOrObject Valid class name, or object
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* @param string $suffix
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* @param string $baseClass Class to halt ancestry search at
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* @return array
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*/
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public static function get_templates_by_class($classOrObject, $suffix = '', $baseClass = null) {
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// Figure out the class name from the supplied context.
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if (!is_object($classOrObject) && !(
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is_string($classOrObject) && class_exists($classOrObject)
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)) {
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throw new InvalidArgumentException(
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'SSViewer::get_templates_by_class() expects a valid class name as its first parameter.'
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);
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}
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$templates = array();
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$classes = array_reverse(ClassInfo::ancestry($classOrObject));
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foreach($classes as $class) {
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$template = $class . $suffix;
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$templates[] = $template;
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$templates[] = ['type' => 'Includes', $template];
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// If the class is "Page_Controller", look for Page.ss
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if (stripos($class, '_controller') !== false) {
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$templates[] = str_ireplace('_controller', '', $class) . $suffix;
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}
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if($baseClass && $class == $baseClass) {
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break;
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}
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}
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return $templates;
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}
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/**
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* @param string|array $templates If passed as a string with .ss extension, used as the "main" template.
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* If passed as an array, it can be used for template inheritance (first found template "wins").
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* Usually the array values are PHP class names, which directly correlate to template names.
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* <code>
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* array('MySpecificPage', 'MyPage', 'Page')
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* </code>
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* @param TemplateParser $parser
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*/
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public function __construct($templates, TemplateParser $parser = null) {
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if ($parser) {
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$this->setParser($parser);
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}
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$this->setTemplate($templates);
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if(!$this->chosen) {
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$message = 'None of the following templates could be found: ';
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$message .= print_r($templates, true);
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$themes = self::get_themes();
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if(!$themes) {
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$message .= ' (no theme in use)';
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} else {
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$message .= ' in themes "' . print_r($themes, true) . '"';
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}
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user_error($message, E_USER_WARNING);
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}
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}
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public function setTemplate($templates) {
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$this->templates = $templates;
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$this->chosen = $this->chooseTemplate($templates);
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$this->subTemplates = [];
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}
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/**
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* Find the template to use for a given list
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*
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* @param array|string $templates
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* @return string
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*/
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public static function chooseTemplate($templates) {
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return ThemeResourceLoader::instance()->findTemplate($templates, self::get_themes());
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}
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/**
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* Set the template parser that will be used in template generation
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*
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* @param TemplateParser $parser
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*/
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public function setParser(TemplateParser $parser)
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{
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$this->parser = $parser;
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}
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/**
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* Returns the parser that is set for template generation
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*
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* @return TemplateParser
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*/
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public function getParser()
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{
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if (!$this->parser) {
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$this->setParser(Injector::inst()->get('SilverStripe\\View\\SSTemplateParser'));
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}
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return $this->parser;
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}
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/**
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* Returns true if at least one of the listed templates exists.
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*
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* @param array $templates
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*
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* @return boolean
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*/
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public static function hasTemplate($templates) {
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return (bool)ThemeResourceLoader::instance()->findTemplate($templates, self::get_themes());
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}
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/**
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* Set a global rendering option.
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*
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* The following options are available:
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* - rewriteHashlinks: If true (the default), <a href="#..."> will be rewritten to contain the
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* current URL. This lets it play nicely with our <base> tag.
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* - If rewriteHashlinks = 'php' then, a piece of PHP script will be inserted before the hash
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* links: "<?php echo $_SERVER['REQUEST_URI']; ?>". This is useful if you're generating a
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* page that will be saved to a .php file and may be accessed from different URLs.
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*
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* @deprecated 4.0 Use the "SSViewer.rewrite_hash_links" config setting instead
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* @param string $optionName
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* @param mixed $optionVal
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*/
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public static function setOption($optionName, $optionVal) {
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if($optionName == 'rewriteHashlinks') {
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Deprecation::notice('4.0', 'Use the "SSViewer.rewrite_hash_links" config setting instead');
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SSViewer::config()->update('rewrite_hash_links', $optionVal);
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} else {
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Deprecation::notice('4.0', 'Use the "SSViewer.' . $optionName . '" config setting instead');
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SSViewer::config()->update($optionName, $optionVal);
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}
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}
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/**
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* @deprecated 4.0 Use the "SSViewer.rewrite_hash_links" config setting instead
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* @param string
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* @return mixed
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*/
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public static function getOption($optionName) {
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if($optionName == 'rewriteHashlinks') {
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Deprecation::notice('4.0', 'Use the "SSViewer.rewrite_hash_links" config setting instead');
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return SSViewer::config()->get('rewrite_hash_links');
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} else {
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Deprecation::notice('4.0', 'Use the "SSViewer.' . $optionName . '" config setting instead');
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return SSViewer::config()->get($optionName);
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}
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}
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/**
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* @config
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* @var boolean
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*/
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private static $rewrite_hash_links = true;
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protected static $topLevel = array();
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public static function topLevel() {
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if(SSViewer::$topLevel) {
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return SSViewer::$topLevel[sizeof(SSViewer::$topLevel)-1];
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}
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return null;
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}
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/**
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* Call this to disable rewriting of <a href="#xxx"> links. This is useful in Ajax applications.
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* It returns the SSViewer objects, so that you can call new SSViewer("X")->dontRewriteHashlinks()->process();
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*/
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public function dontRewriteHashlinks() {
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$this->rewriteHashlinks = false;
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SSViewer::config()->update('rewrite_hash_links', false);
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return $this;
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}
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public function exists() {
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return $this->chosen;
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}
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/**
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* @param string $identifier A template name without '.ss' extension or path
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* @param string $type The template type, either "main", "Includes" or "Layout"
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*
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* @return string Full system path to a template file
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*/
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public static function getTemplateFileByType($identifier, $type = null) {
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return ThemeResourceLoader::instance()->findTemplate(['type' => $type, $identifier], self::get_themes());
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}
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/**
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* Clears all parsed template files in the cache folder.
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*
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* Can only be called once per request (there may be multiple SSViewer instances).
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*
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* @param bool $force Set this to true to force a re-flush. If left to false, flushing
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* may only be performed once a request.
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*/
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public static function flush_template_cache($force = false) {
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if (!self::$template_cache_flushed || $force) {
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$dir = dir(TEMP_FOLDER);
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while (false !== ($file = $dir->read())) {
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if (strstr($file, '.cache')) unlink(TEMP_FOLDER . '/' . $file);
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}
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self::$template_cache_flushed = true;
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}
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}
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/**
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* Clears all partial cache blocks.
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*
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* Can only be called once per request (there may be multiple SSViewer instances).
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*
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* @param bool $force Set this to true to force a re-flush. If left to false, flushing
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* may only be performed once a request.
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*/
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public static function flush_cacheblock_cache($force = false) {
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if (!self::$cacheblock_cache_flushed || $force) {
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$cache = Cache::factory('cacheblock');
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$backend = $cache->getBackend();
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if(
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$backend instanceof Zend_Cache_Backend_ExtendedInterface
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&& ($capabilities = $backend->getCapabilities())
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&& $capabilities['tags']
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) {
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$cache->clean(Zend_Cache::CLEANING_MODE_MATCHING_TAG, $cache->getTags());
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} else {
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$cache->clean(Zend_Cache::CLEANING_MODE_ALL);
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}
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self::$cacheblock_cache_flushed = true;
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}
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}
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/**
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* @var Zend_Cache_Core
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*/
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protected $partialCacheStore = null;
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/**
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* Set the cache object to use when storing / retrieving partial cache blocks.
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*
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* @param Zend_Cache_Core $cache
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*/
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public function setPartialCacheStore($cache) {
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$this->partialCacheStore = $cache;
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}
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/**
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* Get the cache object to use when storing / retrieving partial cache blocks.
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*
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* @return Zend_Cache_Core
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*/
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public function getPartialCacheStore() {
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return $this->partialCacheStore ? $this->partialCacheStore : Cache::factory('cacheblock');
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}
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/**
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* Flag whether to include the requirements in this response.
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*
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* @param boolean
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*/
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public function includeRequirements($incl = true) {
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$this->includeRequirements = $incl;
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}
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/**
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* An internal utility function to set up variables in preparation for including a compiled
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* template, then do the include
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*
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* Effectively this is the common code that both SSViewer#process and SSViewer_FromString#process call
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*
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* @param string $cacheFile The path to the file that contains the template compiled to PHP
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* @param ViewableData $item The item to use as the root scope for the template
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* @param array $overlay Any variables to layer on top of the scope
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* @param array $underlay Any variables to layer underneath the scope
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* @param ViewableData $inheritedScope The current scope of a parent template including a sub-template
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* @return string The result of executing the template
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*/
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protected function includeGeneratedTemplate($cacheFile, $item, $overlay, $underlay, $inheritedScope = null) {
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if(isset($_GET['showtemplate']) && $_GET['showtemplate'] && Permission::check('ADMIN')) {
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$lines = file($cacheFile);
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echo "<h2>Template: $cacheFile</h2>";
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echo "<pre>";
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foreach($lines as $num => $line) {
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echo str_pad($num+1,5) . htmlentities($line, ENT_COMPAT, 'UTF-8');
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}
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echo "</pre>";
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}
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$cache = $this->getPartialCacheStore();
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$scope = new SSViewer_DataPresenter($item, $overlay, $underlay, $inheritedScope);
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$val = '';
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include($cacheFile);
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return $val;
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}
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/**
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* The process() method handles the "meat" of the template processing.
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*
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* It takes care of caching the output (via {@link Cache}), as well as
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* replacing the special "$Content" and "$Layout" placeholders with their
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* respective subtemplates.
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*
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* The method injects extra HTML in the header via {@link Requirements::includeInHTML()}.
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*
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* Note: You can call this method indirectly by {@link ViewableData->renderWith()}.
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*
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* @param ViewableData $item
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* @param array|null $arguments Arguments to an included template
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* @param ViewableData $inheritedScope The current scope of a parent template including a sub-template
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* @return DBHTMLText Parsed template output.
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*/
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public function process($item, $arguments = null, $inheritedScope = null) {
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SSViewer::$topLevel[] = $item;
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$template = $this->chosen;
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$cacheFile = TEMP_FOLDER . "/.cache"
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. str_replace(array('\\','/',':'), '.', Director::makeRelative(realpath($template)));
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$lastEdited = filemtime($template);
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if(!file_exists($cacheFile) || filemtime($cacheFile) < $lastEdited) {
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$content = file_get_contents($template);
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$content = $this->parseTemplateContent($content, $template);
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$fh = fopen($cacheFile,'w');
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fwrite($fh, $content);
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fclose($fh);
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}
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$underlay = array('I18NNamespace' => basename($template));
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// Makes the rendered sub-templates available on the parent item,
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// through $Content and $Layout placeholders.
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foreach(array('Content', 'Layout') as $subtemplate) {
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$sub = null;
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if(isset($this->subTemplates[$subtemplate])) {
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$sub = $this->subTemplates[$subtemplate];
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}
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elseif(!is_array($this->templates)) {
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$sub = ['type' => $subtemplate, $this->templates];
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}
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elseif(!array_key_exists('type', $this->templates) || !$this->templates['type']) {
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$sub = array_merge($this->templates, ['type' => $subtemplate]);
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}
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if ($sub) {
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$subtemplateViewer = clone $this;
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// Disable requirements - this will be handled by the parent template
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$subtemplateViewer->includeRequirements(false);
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// Select the right template
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$subtemplateViewer->setTemplate($sub);
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if ($subtemplateViewer->exists()) {
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$underlay[$subtemplate] = $subtemplateViewer->process($item, $arguments);
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}
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}
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}
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$output = $this->includeGeneratedTemplate($cacheFile, $item, $arguments, $underlay, $inheritedScope);
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if($this->includeRequirements) {
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$output = Requirements::includeInHTML($output);
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}
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array_pop(SSViewer::$topLevel);
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// If we have our crazy base tag, then fix # links referencing the current page.
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$rewrite = SSViewer::config()->get('rewrite_hash_links');
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if($this->rewriteHashlinks && $rewrite) {
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if(strpos($output, '<base') !== false) {
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if($rewrite === 'php') {
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$thisURLRelativeToBase = "<?php echo \\SilverStripe\\Core\\Convert::raw2att(preg_replace(\"/^(\\\\/)+/\", \"/\", \$_SERVER['REQUEST_URI'])); ?>";
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} else {
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$thisURLRelativeToBase = Convert::raw2att(preg_replace("/^(\\/)+/", "/", $_SERVER['REQUEST_URI']));
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}
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$output = preg_replace('/(<a[^>]+href *= *)"#/i', '\\1"' . $thisURLRelativeToBase . '#', $output);
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}
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}
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return DBField::create_field('HTMLFragment', $output);
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}
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/**
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* Execute the given template, passing it the given data.
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* Used by the <% include %> template tag to process templates.
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*
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* @param string $template Template name
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* @param mixed $data Data context
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* @param array $arguments Additional arguments
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* @param Object $scope
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* @return string Evaluated result
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*/
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public static function execute_template($template, $data, $arguments = null, $scope = null) {
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$v = new SSViewer($template);
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$v->includeRequirements(false);
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return $v->process($data, $arguments, $scope);
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}
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/**
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* Execute the evaluated string, passing it the given data.
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* Used by partial caching to evaluate custom cache keys expressed using
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* template expressions
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*
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* @param string $content Input string
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* @param mixed $data Data context
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* @param array $arguments Additional arguments
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* @return string Evaluated result
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*/
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public static function execute_string($content, $data, $arguments = null) {
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$v = SSViewer::fromString($content);
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$v->includeRequirements(false);
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return $v->process($data, $arguments);
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}
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public function parseTemplateContent($content, $template="") {
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return $this->getParser()->compileString(
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$content,
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$template,
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Director::isDev() && SSViewer::config()->get('source_file_comments')
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);
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}
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/**
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* Returns the filenames of the template that will be rendered. It is a map that may contain
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|
* 'Content' & 'Layout', and will have to contain 'main'
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*/
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public function templates() {
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return array_merge(['main' => $this->chosen], $this->subTemplates);
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}
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/**
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|
* @param string $type "Layout" or "main"
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* @param string $file Full system path to the template file
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*/
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public function setTemplateFile($type, $file) {
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|
if (!$type || $type == 'main') $this->chosen = $file;
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else $this->subTemplates[$type] = $file;
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}
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/**
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* Return an appropriate base tag for the given template.
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* It will be closed on an XHTML document, and unclosed on an HTML document.
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|
*
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|
* @param string $contentGeneratedSoFar The content of the template generated so far; it should contain
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|
* the DOCTYPE declaration.
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* @return string
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|
*/
|
|
public static function get_base_tag($contentGeneratedSoFar) {
|
|
$base = Director::absoluteBaseURL();
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|
|
|
// Is the document XHTML?
|
|
if(preg_match('/<!DOCTYPE[^>]+xhtml/i', $contentGeneratedSoFar)) {
|
|
return "<base href=\"$base\" />";
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|
} else {
|
|
return "<base href=\"$base\"><!--[if lte IE 6]></base><![endif]-->";
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}
|
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}
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}
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