[5.2] Add @elsecan and @elsecannot blade directives (#13256)

*        add elsecan and elsecannot blade directives

*         use container resolving of the Gate class

src/Illuminate/View/Compilers/BladeCompiler.php

@@ -628,6 +628,17 @@ protected function compileCan($expression)
         return "<?php if (app('Illuminate\\Contracts\\Auth\\Access\\Gate')->check{$expression}): ?>";
     }
 
+    /**
+     * Compile the else-can statements into valid PHP.
+     *
+     * @param  string  $expression
+     * @return string
+     */
+    protected function compileElsecan($expression)
+    {
+        return "<?php elseif (app('Illuminate\\Contracts\\Auth\\Access\\Gate')->check{$expression}): ?>";
+    }
+
     /**
      * Compile the cannot statements into valid PHP.
      *
@@ -639,6 +650,17 @@ protected function compileCannot($expression)
         return "<?php if (app('Illuminate\\Contracts\\Auth\\Access\\Gate')->denies{$expression}): ?>";
     }
 
+    /**
+     * Compile the else-can statements into valid PHP.
+     *
+     * @param  string  $expression
+     * @return string
+     */
+    protected function compileElsecannot($expression)
+    {
+        return "<?php elseif (app('Illuminate\\Contracts\\Auth\\Access\\Gate')->denies{$expression}): ?>";
+    }
+
     /**
      * Compile the if statements into valid PHP.
      *

tests/View/ViewBladeCompilerTest.php

@@ -257,9 +257,13 @@ public function testCanStatementsAreCompiled()
         $compiler = new BladeCompiler($this->getFiles(), __DIR__);
         $string = '@can (\'update\', [$post])
 breeze
+@elsecan(\'delete\', [$post])
+sneeze
 @endcan';
         $expected = '<?php if (app(\'Illuminate\\Contracts\\Auth\\Access\\Gate\')->check(\'update\', [$post])): ?>
 breeze
+<?php elseif (app(\'Illuminate\\Contracts\\Auth\\Access\\Gate\')->check(\'delete\', [$post])): ?>
+sneeze
 <?php endif; ?>';
         $this->assertEquals($expected, $compiler->compileString($string));
     }
@@ -269,9 +273,13 @@ public function testCannotStatementsAreCompiled()
         $compiler = new BladeCompiler($this->getFiles(), __DIR__);
         $string = '@cannot (\'update\', [$post])
 breeze
+@elsecannot(\'delete\', [$post])
+sneeze
 @endcannot';
         $expected = '<?php if (app(\'Illuminate\\Contracts\\Auth\\Access\\Gate\')->denies(\'update\', [$post])): ?>
 breeze
+<?php elseif (app(\'Illuminate\\Contracts\\Auth\\Access\\Gate\')->denies(\'delete\', [$post])): ?>
+sneeze
 <?php endif; ?>';
         $this->assertEquals($expected, $compiler->compileString($string));
     }