1 files changed, 40 insertions, 0 deletions
diff --git a/script/core/diagnostics/unused-function.lua b/script/core/diagnostics/unused-function.lua
new file mode 100644
index 00000000..f0bca613
--- /dev/null
+++ b/script/core/diagnostics/unused-function.lua
@@ -0,0 +1,40 @@
+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
+    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' then
+            return
+        end
+        local hasGet
+        local refs = vm.getRefs(source)
+        for _, src in ipairs(refs) do
+            if vm.isGet(src) then
+                hasGet = true
+                break
+            end
+        end
+        if not hasGet then
+            callback {
+                start   = source.start,
+                finish  = source.finish,
+                tags    = { define.DiagnosticTag.Unnecessary },
+                message = lang.script.DIAG_UNUSED_FUNCTION,
+            }
+        end
+    end)
+end