PHP ^7.1 and CssMap Trait

composer.json

@@ -1,16 +1,19 @@
 {
-    "name": "adt/utils",
-    "description": "Utilities",
-
-    "authors": [
-        {
-            "name": "studnaa",
-            "email": "[email protected]"
-        }
-    ],
-
-    "autoload": {
-        "classmap": ["src/"]
+  "name": "adt/utils",
+  "description": "Utilities",
+  "authors": [
+    {
+      "name": "studnaa",
+      "email": "[email protected]"
     }
-
+  ],
+  "autoload": {
+    "classmap": [
+      "src/"
+    ]
+  },
+  "require": {
+    "php": "^7.1",
+    "ext-json": "*"
+  }
 }

src/CssMap.php

@@ -0,0 +1,46 @@
+<?php
+namespace ADT\Utils;
+
+
+trait CssMap {
+	/**
+	 * Automatically adds className map to template on attached
+	 */
+	public function injectCssMapFromWebpack() {
+		$this->onAfterAttached[] = function() {
+			$this->template->className = $this->loadFromWebpack();
+		};
+	}
+
+	/**
+	 * Looks for $moduleName.module.scss.json in current directory and returns
+	 * content as array on success
+	 * @param string $moduleName
+	 * @param string|null $dir
+	 * @return array
+	 */
+	private function loadFromWebpack(string $moduleName = 'index', string $dir = NULL): array {
+		$dir = $dir ?? dirname($this->getReflection()->getFileName());
+		$filePath = $dir . "/$moduleName.module.scss.json";
+
+		if (! file_exists($filePath)) {
+			throw new \InvalidArgumentException("Css module file not found in ". $filePath);
+		}
+
+		$file = file_get_contents($filePath);
+
+		if ($file === false) {
+			throw new \InvalidArgumentException('Css Module file not found in ' . $filePath);
+		}
+
+		$decodedModule = json_decode($file, true);
+
+		if (json_last_error() !== JSON_ERROR_NONE) {
+			throw new \UnexpectedValueException(
+				'Css Module file is not valid json file: ' . json_last_error_msg()
+			);
+		}
+
+		return $decodedModule;
+	}
+}