[8.x] Add js() helper (#39389)

* Add js() helper

* update docBlock to pass all tests

* Fix failing StyleCI

* Update helpers.php

* Update helpers.php

* add tests

* formatting

* move test

* fix sort

* Fix: Support Js string, escaping characters.

* Rename Json blade directives and helpers

* update BladeJsonTest

* second try with BladeJsonTest

* Fix StyleCI

* Reverting back to Js:from with changes suggested by @derekmd

* fixing tests backslash

Co-authored-by: Dries Vints <[email protected]>
Co-authored-by: Taylor Otwell <[email protected]>

Author: 3 people

src/Illuminate/Support/Js.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Illuminate\Support;
+
+class Js
+{
+    /**
+     * Convert an expression into a valid JavaScript object, JSON string, or string.
+     *
+     * @param  mixed  $expression
+     * @param  int|null  $options
+     * @param  int  $depth
+     * @return string
+     */
+    public static function from($expression, $options = null, $depth = 512)
+    {
+        if (is_object($expression) || is_array($expression)) {
+            $base64 = base64_encode(json_encode($expression, $options, $depth));
+
+            return "JSON.parse(atob('{$base64}'))";
+        }
+
+        if (is_string($expression)) {
+            return "'".str_replace("'", "\'", str_replace('\\', '\\\\', $expression))."'";
+        }
+
+        return json_encode($expression, $options, $depth);
+    }
+}

tests/Support/SupportJsTest.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Illuminate\Tests\Support;
+
+use Illuminate\Support\Js;
+use PHPUnit\Framework\TestCase;
+
+class SupportJsTest extends TestCase
+{
+    public function testJsFrom()
+    {
+        $this->assertEquals("'hey'", Js::from('hey'));
+        $this->assertEquals("'don\'t mess with my path\\\path'", Js::from("don't mess with my path\path"));
+        $this->assertEquals("JSON.parse(atob('eyJoZXkiOiJ0aGVyZSJ9'))", Js::from(['hey' => 'there']));
+        $this->assertEquals("JSON.parse(atob('WyJoZXkiLCJ0aGVyZSJd'))", Js::from(['hey', 'there']));
+    }
+}