From 23411c384b049f015d4f7d80409125894a9e2d96 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9C=80=E8=90=8C=E5=B0=8F=E6=B1=90?= <sumneko@hotmail.com>
Date: Tue, 17 Sep 2019 10:58:44 +0800
Subject: =?UTF-8?q?=5FENV=E7=BD=AE=E4=B8=BAnil=E5=90=8E=E7=9A=84=E5=85=A8?=
 =?UTF-8?q?=E5=B1=80=E5=8F=98=E9=87=8F=E8=AF=8A=E6=96=AD?=
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---
 server/src/core/diagnostics.lua | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

(limited to 'server/src/core')

diff --git a/server/src/core/diagnostics.lua b/server/src/core/diagnostics.lua
index 509fe48c..0e0d85ba 100644
--- a/server/src/core/diagnostics.lua
+++ b/server/src/core/diagnostics.lua
@@ -553,6 +553,29 @@ function mt:searchUndefinedEnvChild(callback)
     end)
 end
 
+function mt:searchGlobalInNilEnv(callback)
+    self.vm:eachSource(function (source)
+        if not source:get 'global' then
+            return
+        end
+        local name = source:getName()
+        if name == '' then
+            return
+        end
+        local parentSource = source:get 'parent' :getSource()
+        if parentSource.type == 'nil' then
+            callback(source.start, source.finish, {
+                {
+                    start  = parentSource.start,
+                    finish = parentSource.finish,
+                    uri    = self.uri,
+                }
+            })
+        end
+        return
+    end)
+end
+
 function mt:checkEmmyClass(source, callback)
     local class = source:get 'emmy.class'
     if not class then
@@ -919,6 +942,20 @@ return function (vm, lines, uri)
             }
         end
     end)
+    -- 全局变量不可用（置空了 `_ENV`）
+    session:doDiagnostics(session.searchGlobalInNilEnv, 'global-in-nil-env', function (related)
+        if vm.envType == '_ENV' then
+            return {
+                message = lang.script.DIAG_GLOBAL_IN_NIL_ENV,
+                related = related,
+            }
+        else
+            return {
+                message = lang.script.DIAG_GLOBAL_IN_NIL_FENV,
+                related = related,
+            }
+        end
+    end)
     -- 构建表时重复定义field
     session:doDiagnostics(session.searchDuplicateIndex, 'duplicate-index', function (key, related, type)
         if type == 'unused' then
-- 
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