Added TemplatePack classing.

Author: srtab

src/Config.php

@@ -2,26 +2,20 @@
 namespace PHPForm;
 
 use PHPForm\Renderers\TwigRenderer;
+use PHPForm\TemplatePacks\DefaultTemplatePack;
 
 class Config extends Singleton
 {
     /**
-     * @var string Directory with templates
+     * @var array Template packs to be used. The templates will be loaded
+     *            accordingly to the order defined.
      */
-    protected $templates_dir = __DIR__ . '/templates/';
+    protected $template_packs = array(
+        DefaultTemplatePack::class,
+    );
 
     /**
-     * @var string Default fallback template pack
-     */
-    protected $fallback_template_pack = "default";
-
-    /**
-     * @var string Default template pack defined. If null, fallback is used.
-     */
-    protected $template_pack = null;
-
-    /**
-     * @var string Renderer class used to render html content
+     * @var string Renderer class used to render html content.
      */
     protected $renderer_class = TwigRenderer::class;
 
@@ -31,45 +25,52 @@ class Config extends Singleton
     private $renderer;
 
     /**
-     * Templates path accordingly with defined template pack.
+     * Return renderer class instantiated
      *
-     * @return string
+     * @return PHPForm\Renderers\Renderer
      */
-    private function buildPath($template_pack)
+    public function getRenderer()
     {
-        $path = $this->templates_dir . $template_pack . "/";
-
-        if (!file_exists($path)) {
-            trigger_error("Template pack dir '$path' don't exists.", E_USER_ERROR);
+        if (is_null($this->renderer)) {
+            $this->renderer = new $this->renderer_class($this->getTemplatesDirs());
         }
 
-        return $path;
+        return $this->renderer;
     }
 
     /**
-     * Return renderer class instantiated
+     * Set renderer class.
      *
-     * @return PHPForm\Renderers\Renderer
+     * @param string Class name of Renderer.
      */
-    public function getRenderer()
+    public function setRenderer(string $renderer_class)
     {
-        if (is_null($this->renderer)) {
-            $fallback_pack_dir = $this->buildPath($this->fallback_template_pack);
-            $pack_dir = !is_null($this->template_pack) ? $this->buildPath($this->template_pack) : null;
-
-            $this->renderer = new $this->renderer_class($fallback_pack_dir, $pack_dir);
-        }
+        $this->renderer_class = $renderer_class;
+    }
 
-        return $this->renderer;
+    /**
+     * Set template pack on top level.
+     *
+     * @param string Class name of TemplatePack.
+     */
+    public function setTemplatePack(string $template_pack)
+    {
+        $this->template_packs = array_unshift($this->template_packs, $template_pack);
     }
 
     /**
-     * Define template pack
+     * Traverse all packs to extract template dir path.
      *
-     * @param string
+     * @return array
      */
-    public function setTemplatePack($template_pack)
+    private function getTemplatesDirs()
     {
-        $this->template_pack = $template_pack;
+        $dirs = array();
+
+        foreach ($this->template_packs as $template_pack) {
+            $dirs[] = $template_pack::TEMPLATES_DIR;
+        }
+
+        return $dirs;
     }
 }

src/Forms/Form.php

@@ -7,8 +7,6 @@
 use Iterator;
 use UnexpectedValueException;
 
-use Fleshgrinder\Core\Formatter;
-
 use PHPForm\Errors\ErrorList;
 use PHPForm\Exceptions\ValidationError;
 use PHPForm\Fields\BoundField;

src/Renderers/Renderer.php

@@ -6,7 +6,6 @@
 
 interface Renderer
 {
-    public function __construct(string $fallback_templates_dir, string $templates_dir);
-    public function getTemplate(string $template_name);
+    public function __construct(array $templates_dirs);
     public function render(string $template_name, array $context);
 }

src/Renderers/TwigRenderer.php

@@ -10,26 +10,45 @@
 
 class TwigRenderer implements Renderer
 {
+    /**
+     * @var Twig_Environment Twig instance.
+     */
     private $twig;
 
-    public function __construct(string $fallback_templates_dir, string $templates_dir = null)
+    /**
+     * Instantiate twig and chain loaders. The chain loader will start from the
+     * first element in the array to load templates, traversing the array until
+     * it finds the template.
+     *
+     * @param array $template_dirs
+     */
+    public function __construct(array $templates_dirs)
     {
         $loaders = new Twig_Loader_Chain();
 
-        if (!is_null($templates_dir)) {
-            $loaders->addLoader(new Twig_Loader_Filesystem($templates_dir));
+        foreach ($templates_dirs as $template_dir) {
+            $loaders->addLoader(new Twig_Loader_Filesystem($template_dir));
         }
 
-        $loaders->addLoader(new Twig_Loader_Filesystem($fallback_templates_dir));
-
         $this->twig = new Twig_Environment($loaders);
     }
 
-    public function getTemplate(string $template_name)
+    /**
+     * @param  string $template_name Template path to be loaded.
+     *
+     * @return Twig_TemplateWrapper
+     */
+    private function getTemplate(string $template_name)
     {
         return $this->twig->load($template_name);
     }
 
+    /**
+     * @param  string $template_name Template path to be loaded.
+     * @param  array  $context       Data to be injected on template.
+     *
+     * @return string
+     */
     public function render(string $template_name, array $context)
     {
         $template = $this->getTemplate($template_name);

src/TemplatePacks/Bootstrap4TemplatePack.php

@@ -0,0 +1,11 @@
+<?php
+/**
+* Bootstrap v4.0.0-beta.2 template pack
+*/
+namespace PHPForm\TemplatePacks;
+
+class Bootstrap4TemplatePack extends TemplatePack
+{
+    const NAME = "bootstrap4";
+    const TEMPLATES_DIR = __DIR__ . '/templates/bootstrap4/';
+}

src/TemplatePacks/DefaultTemplatePack.php

@@ -0,0 +1,10 @@
+<?php
+namespace PHPForm\TemplatePacks;
+
+/**
+* Default template pack
+*/
+class DefaultTemplatePack extends TemplatePack
+{
+    const TEMPLATES_DIR = __DIR__ . '/templates/default/';
+}

src/TemplatePacks/TemplatePack.php

@@ -0,0 +1,11 @@
+<?php
+namespace PHPForm\TemplatePacks;
+
+/**
+* Base class to define template packs
+*/
+abstract class TemplatePack
+{
+    const NAME = 'default';
+    const TEMPLATES_DIR = null;
+}