visitor/delete-illegal-return: change to an independent visitor and apply to plugin sojsonv7

Signed-off-by: echo094 <20028238+echo094@users.noreply.github.com>

Author: echo094

src/plugin/obfuscator.js

@@ -1160,14 +1160,6 @@ function purifyCode(ast) {
 
   // 拆分语句
   traverse(ast, { SequenceExpression: splitSequence })
-  // IllegalReturn
-  traverse(ast, {
-    ReturnStatement(path) {
-      if (!path.getFunctionParent()) {
-        path.remove()
-      }
-    },
-  })
   return ast
 }
 
@@ -1363,6 +1355,9 @@ module.exports = function (jscode) {
     console.error(`Cannot parse code: ${e.reasonCode}`)
     return null
   }
+  // IllegalReturn
+  const deleteIllegalReturn = require('../visitor/delete-illegal-return')
+  traverse(ast, deleteIllegalReturn)
   // 清理二进制显示内容
   traverse(ast, {
     StringLiteral: ({ node }) => {

src/plugin/sojsonv7.js

@@ -927,6 +927,9 @@ module.exports = function (code) {
     console.error(`Cannot parse code: ${e.reasonCode}`)
     return null
   }
+  // IllegalReturn
+  const deleteIllegalReturn = require('../visitor/delete-illegal-return')
+  traverse(ast, deleteIllegalReturn)
   // 清理二进制显示内容
   traverse(ast, {
     StringLiteral: ({ node }) => {

src/visitor/delete-illegal-return.js

@@ -0,0 +1,10 @@
+/**
+ * delete ReturnStatement in Program scope
+ */
+module.exports = {
+  ReturnStatement(path) {
+    if (!path.getFunctionParent()) {
+      path.remove()
+    }
+  },
+}