Merge pull request '如果else分支只有注释，那就不渲染这个分支' (#11) from empty-else into master

Reviewed-on: #11

src/Php/CompilerBase.php

@@ -4255,7 +4255,7 @@ class CompilerBase extends \PhpAot\Core\Translator implements PropertyAccessCont
     protected function parseIfChain(array $arms, ?Node\Stmt\Else_ $else, int $index): string
     {
         if (!isset($arms[$index])) {
-            if (!$else) {
+            if (!$else || $this->isEmptyStmtList($else->stmts)) {
                 return '';
             }
             return $this->parseBlockStmts($else->stmts);
@@ -4273,6 +4273,16 @@ class CompilerBase extends \PhpAot\Core\Translator implements PropertyAccessCont
         return $code;
     }
 
+    protected function isEmptyStmtList(array $stmts): bool
+    {
+        foreach ($stmts as $stmt) {
+            if (!$stmt instanceof Node\Stmt\Nop) {
+                return false;
+            }
+        }
+        return true;
+    }
+
     /**
      * 逻辑比较的运算，必须返回 bool 类型.
      */

tests/aot/control_flow/empty-else.phpt

@@ -0,0 +1,19 @@
+--TEST--
+empty else with comments
+--FILE--
+<?php
+function main() {
+    if (true) {
+        echo 'success';
+    } else {
+        // 1
+        # 1
+        /**
+         * 1
+         * 2
+         */
+    }
+}
+?>
+--EXPECT--
+success