Update to Symfony YAML 5.0 and Twig 3.0

Pico now requires PHP 7.2.5+

composer.json

@@ -31,9 +31,9 @@
         "source": "https://github.com/picocms/Pico"
     },
     "require": {
-        "php": ">=7.0.8",
-        "twig/twig": "^2.12",
-        "symfony/yaml" : "^3.4",
+        "php": ">=7.2.5",
+        "twig/twig": "^3.0",
+        "symfony/yaml" : "^5.0",
         "erusev/parsedown": "1.7.4",
         "erusev/parsedown-extra": "0.8.1"
     },

config/config.yml.template

@@ -27,7 +27,7 @@ twig_config:                        # Twig template engine config
 ##
 # Content
 #
-date_format: %D %T                  # Pico's default date format;
+date_format: "%D %T"                # Pico's default date format;
                                     #     See https://php.net/manual/en/function.strftime.php for more info
 pages_order_by_meta: author         # Sort pages by meta value "author" (set "pages_order_by" to "meta")
 pages_order_by: alpha               # Change how Pico sorts pages ("alpha" for alphabetical order, "date", or "meta")

content-sample/_meta.md

@@ -1,5 +1,5 @@
 ---
-Logo: %theme_url%/img/pico-white.svg
+Logo: "%theme_url%/img/pico-white.svg"
 Tagline: Making the web easy.
 Social:
     - title: Visit us on GitHub

index.php.dist

@@ -11,8 +11,8 @@
  */
 
 // check PHP platform requirements
-if (PHP_VERSION_ID < 70008) {
-    die('Pico requires PHP 7.0.8 or above to run');
+if (PHP_VERSION_ID < 70205) {
+    die('Pico requires PHP 7.2.5 or above to run');
 }
 if (!extension_loaded('dom')) {
     die("Pico requires the PHP extension 'dom' to run");

lib/Pico.php

@@ -18,6 +18,13 @@
 
 namespace picocms\Pico;
 
+use Symfony\Component\Yaml\Parser as YamlParser;
+use Twig\Environment as TwigEnvironment;
+use Twig\Extension\DebugExtension as TwigDebugExtension;
+use Twig\Loader\FilesystemLoader as TwigFilesystemLoader;
+use Twig\Markup as TwigMarkup;
+use Twig\TwigFilter;
+
 /**
  * Pico
  *
@@ -229,7 +236,7 @@ class Pico
      * Symfony YAML instance used for meta header parsing
      *
      * @see Pico::getYamlParser()
-     * @var \Symfony\Component\Yaml\Parser|null
+     * @var YamlParser|null
      */
     protected $yamlParser;
 
@@ -309,7 +316,7 @@ class Pico
      * Twig instance used for template parsing
      *
      * @see Pico::getTwig()
-     * @var \Twig_Environment|null
+     * @var TwigEnvironment|null
      */
     protected $twig;
 
@@ -1438,12 +1445,12 @@ class Pico
      * This method triggers the `onYamlParserRegistered` event when the Symfony
      * YAML parser wasn't initiated yet.
      *
-     * @return \Symfony\Component\Yaml\Parser Symfony YAML parser
+     * @return YamlParser Symfony YAML parser
      */
     public function getYamlParser()
     {
         if ($this->yamlParser === null) {
-            $this->yamlParser = new \Symfony\Component\Yaml\Parser();
+            $this->yamlParser = new YamlParser();
             $this->triggerEvent('onYamlParserRegistered', [ &$this->yamlParser ]);
         }
 
@@ -2080,19 +2087,19 @@ class Pico
      * @see http://twig.sensiolabs.org/ Twig website
      * @see https://github.com/twigphp/Twig Twig on GitHub
      *
-     * @return \Twig_Environment|null Twig template engine
+     * @return TwigEnvironment|null Twig template engine
      */
     public function getTwig()
     {
         if ($this->twig === null) {
             $twigConfig = $this->getConfig('twig_config');
 
-            $twigLoader = new \Twig_Loader_Filesystem($this->getThemesDir() . $this->getTheme());
-            $this->twig = new \Twig_Environment($twigLoader, $twigConfig);
+            $twigLoader = new TwigFilesystemLoader($this->getThemesDir() . $this->getTheme());
+            $this->twig = new TwigEnvironment($twigLoader, $twigConfig);
             $this->twig->addExtension(new TwigExtension($this));
 
             if (!empty($twigConfig['debug'])) {
-                $this->twig->addExtension(new \Twig_Extension_Debug());
+                $this->twig->addExtension(new TwigDebugExtension());
             }
 
             // register content filter
@@ -2100,7 +2107,7 @@ class Pico
             // this is the reason why we can't register this filter as part of PicoTwigExtension
             $pico = $this;
             $pages = &$this->pages;
-            $this->twig->addFilter(new \Twig_SimpleFilter(
+            $this->twig->addFilter(new TwigFilter(
                 'content',
                 function ($page) use ($pico, &$pages) {
                     if (isset($pages[$page])) {
@@ -2141,7 +2148,7 @@ class Pico
             'theme_url' => $this->getConfig('themes_url') . $this->getTheme(),
             'site_title' => $this->getConfig('site_title'),
             'meta' => $this->meta,
-            'content' => new \Twig_Markup($this->content, 'UTF-8'),
+            'content' => new TwigMarkup($this->content, 'UTF-8'),
             'pages' => $this->pages,
             'previous_page' => $this->previousPage,
             'current_page' => $this->currentPage,

lib/TwigExtension.php

@@ -12,6 +12,11 @@
 
 namespace picocms\Pico;
 
+use Twig\Error\RuntimeError as TwigRuntimeError;
+use Twig\Extension\AbstractExtension as AbstractTwigExtension;
+use Twig\TwigFilter;
+use Twig\TwigFunction;
+
 /**
  * Pico's Twig extension to implement additional filters
  *
@@ -20,7 +25,7 @@ namespace picocms\Pico;
  * @license http://opensource.org/licenses/MIT The MIT License
  * @version 3.0
  */
-class TwigExtension extends \Twig_Extension
+class TwigExtension extends AbstractTwigExtension
 {
     /**
      * Current instance of Pico
@@ -69,20 +74,20 @@ class TwigExtension extends \Twig_Extension
      *
      * @see Twig_ExtensionInterface::getFilters()
      *
-     * @return \Twig_SimpleFilter[] array of Pico's Twig filters
+     * @return TwigFilter[] array of Pico's Twig filters
      */
     public function getFilters()
     {
         return [
-            'markdown' => new \Twig_SimpleFilter(
+            'markdown' => new TwigFilter(
                 'markdown',
                 [ $this, 'markdownFilter' ],
                 [ 'is_safe' => [ 'html' ] ]
             ),
-            'map' => new \Twig_SimpleFilter('map', [ $this, 'mapFilter' ]),
-            'sort_by' => new \Twig_SimpleFilter('sort_by', [ $this, 'sortByFilter' ]),
-            'link' => new \Twig_SimpleFilter('link', [ $this->pico, 'getPageUrl' ]),
-            'url' => new \Twig_SimpleFilter('url', [ $this->pico, 'substituteUrl' ]),
+            'map' => new TwigFilter('map', [ $this, 'mapFilter' ]),
+            'sort_by' => new TwigFilter('sort_by', [ $this, 'sortByFilter' ]),
+            'link' => new TwigFilter('link', [ $this->pico, 'getPageUrl' ]),
+            'url' => new TwigFilter('url', [ $this->pico, 'substituteUrl' ]),
         ];
     }
 
@@ -91,14 +96,14 @@ class TwigExtension extends \Twig_Extension
      *
      * @see Twig_ExtensionInterface::getFunctions()
      *
-     * @return \Twig_SimpleFunction[] array of Pico's Twig functions
+     * @return TwigFunction[] array of Pico's Twig functions
      */
     public function getFunctions()
     {
         return [
-            'url_param' => new \Twig_SimpleFunction('url_param', [ $this, 'urlParamFunction' ]),
-            'form_param' => new \Twig_SimpleFunction('form_param', [ $this, 'formParamFunction' ]),
-            'pages' => new \Twig_SimpleFunction('pages', [ $this, 'pagesFunction' ]),
+            'url_param' => new TwigFunction('url_param', [ $this, 'urlParamFunction' ]),
+            'form_param' => new TwigFunction('form_param', [ $this, 'formParamFunction' ]),
+            'pages' => new TwigFunction('pages', [ $this, 'pagesFunction' ]),
         ];
     }
 
@@ -138,12 +143,12 @@ class TwigExtension extends \Twig_Extension
      *
      * @return array mapped values
      *
-     * @throws \Twig_Error_Runtime
+     * @throws TwigRuntimeError
      */
     public function mapFilter($var, $mapKeyPath)
     {
         if (!is_array($var) && (!is_object($var) || !($var instanceof \Traversable))) {
-            throw new \Twig_Error_Runtime(sprintf(
+            throw new TwigRuntimeError(sprintf(
                 'The map filter only works with arrays or "Traversable", got "%s"',
                 is_object($var) ? get_class($var) : gettype($var)
             ));
@@ -180,20 +185,20 @@ class TwigExtension extends \Twig_Extension
      *
      * @return array sorted array
      *
-     * @throws \Twig_Error_Runtime
+     * @throws TwigRuntimeError
      */
     public function sortByFilter($var, $sortKeyPath, $fallback = 'bottom')
     {
         if (is_object($var) && ($var instanceof \Traversable)) {
             $var = iterator_to_array($var, true);
         } elseif (!is_array($var)) {
-            throw new \Twig_Error_Runtime(sprintf(
+            throw new TwigRuntimeError(sprintf(
                 'The sort_by filter only works with arrays or "Traversable", got "%s"',
                 is_object($var) ? get_class($var) : gettype($var)
             ));
         }
         if (($fallback !== 'top') && ($fallback !== 'bottom') && ($fallback !== 'keep') && ($fallback !== "remove")) {
-            throw new \Twig_Error_Runtime(
+            throw new TwigRuntimeError(
                 'The sort_by filter only supports the "top", "bottom", "keep" and "remove" fallbacks'
             );
         }
@@ -423,7 +428,7 @@ class TwigExtension extends \Twig_Extension
      *
      * @return array[] the data of the matched pages
      *
-     * @throws \Twig_Error_Runtime
+     * @throws TwigRuntimeError
      */
     public function pagesFunction($start = '', $depth = 0, $depthOffset = 0, $offset = 1)
     {
@@ -445,7 +450,7 @@ class TwigExtension extends \Twig_Extension
         $depthOffset = $depthOffset + $offset;
 
         if (($depth !== null) && ($depth < 0)) {
-            throw new \Twig_Error_Runtime('The pages function doesn\'t support negative depths');
+            throw new TwigRuntimeError('The pages function doesn\'t support negative depths');
         }
 
         $pageTree = $this->getPico()->getPageTree();