1 files changed, 66 insertions, 0 deletions
diff --git a/script/core/diagnostics/global-in-nil-env.lua b/script/core/diagnostics/global-in-nil-env.lua
new file mode 100644
index 00000000..9a0d4f35
--- /dev/null
+++ b/script/core/diagnostics/global-in-nil-env.lua
@@ -0,0 +1,66 @@
+local files    = require 'files'
+local guide    = require 'parser.guide'
+local lang     = require 'language'
+
+-- TODO: 检查路径是否可达
+local function mayRun(path)
+    return true
+end
+
+return function (uri, callback)
+    local ast = files.getAst(uri)
+    if not ast then
+        return
+    end
+    local root = guide.getRoot(ast.ast)
+    local env  = guide.getENV(root)
+
+    local nilDefs = {}
+    if not env.ref then
+        return
+    end
+    for _, ref in ipairs(env.ref) do
+        if ref.type == 'setlocal' then
+            if ref.value and ref.value.type == 'nil' then
+                nilDefs[#nilDefs+1] = ref
+            end
+        end
+    end
+
+    if #nilDefs == 0 then
+        return
+    end
+
+    local function check(source)
+        local node = source.node
+        if node.tag == '_ENV' then
+            local ok
+            for _, nilDef in ipairs(nilDefs) do
+                local mode, pathA = guide.getPath(nilDef, source)
+                if  mode == 'before'
+                and mayRun(pathA) then
+                    ok = nilDef
+                    break
+                end
+            end
+            if ok then
+                callback {
+                    start   = source.start,
+                    finish  = source.finish,
+                    uri     = uri,
+                    message = lang.script.DIAG_GLOBAL_IN_NIL_ENV,
+                    related = {
+                        {
+                            start  = ok.start,
+                            finish = ok.finish,
+                            uri    = uri,
+                        }
+                    }
+                }
+            end
+        end
+    end
+
+    guide.eachSourceType(ast.ast, 'getglobal', check)
+    guide.eachSourceType(ast.ast, 'setglobal', check)
+end