1 files changed, 45 insertions, 0 deletions
diff --git a/script-beta/src/core/diagnostics/unused-function.lua b/script-beta/src/core/diagnostics/unused-function.lua
new file mode 100644
index 00000000..6c53cdf7
--- /dev/null
+++ b/script-beta/src/core/diagnostics/unused-function.lua
@@ -0,0 +1,45 @@
+local files   = require 'files'
+local guide   = require 'parser.guide'
+local vm      = require 'vm'
+local define  = require 'proto.define'
+local lang    = require 'language'
+local await   = require 'await'
+
+return function (uri, callback)
+    local ast = files.getAst(uri)
+    if not ast then
+        return
+    end
+    -- 只检查局部函数与全局函数
+    guide.eachSourceType(ast.ast, 'function', function (source)
+        local parent = source.parent
+        if not parent then
+            return
+        end
+        if  parent.type ~= 'local'
+        and parent.type ~= 'setlocal'
+        and parent.type ~= 'setglobal' then
+            return
+        end
+        local hasSet
+        local hasGet = vm.eachRef(source, function (info)
+            if     info.mode == 'get' then
+                return true
+            elseif info.mode == 'set'
+            or     info.mode == 'declare' then
+                hasSet = true
+            end
+        end)
+        if not hasGet and hasSet then
+            callback {
+                start   = source.start,
+                finish  = source.finish,
+                tags    = { define.DiagnosticTag.Unnecessary },
+                message = lang.script.DIAG_UNUSED_FUNCTION,
+            }
+        end
+        await.delay(function ()
+            return files.globalVersion
+        end)
+    end)
+end