1 files changed, 37 insertions, 0 deletions
diff --git a/script/core/diagnostics/count-down-loop.lua b/script/core/diagnostics/count-down-loop.lua
new file mode 100644
index 00000000..b64391fd
--- /dev/null
+++ b/script/core/diagnostics/count-down-loop.lua
@@ -0,0 +1,37 @@
+local files = require "files"
+local guide = require "parser.guide"
+local lang  = require 'language'
+
+return function (uri, callback)
+    local state = files.getAst(uri)
+    local text  = files.getText(uri)
+    if not state or not text then
+        return
+    end
+
+    guide.eachSourceType(state.ast, 'loop', function (source)
+        if not source.loc or not source.loc.value then
+            return
+        end
+        local maxNumer = source.max and source.max.type == 'number' and tonumber(source.max[1])
+        if maxNumer ~= 1 then
+            return
+        end
+        if not source.step then
+            callback {
+                start  = source.loc.value.start,
+                finish = source.max.finish,
+                message = lang.script('DIAG_COUNT_DOWN_LOOP', ('%s, %s'):format(text:sub(source.loc.value.start, source.max.finish), '-1'))
+            }
+        else
+            local stepNumber = source.step.type == 'number' and tonumber(source.step[1])
+            if stepNumber and stepNumber > 0 then
+                callback {
+                    start  = source.loc.value.start,
+                    finish = source.step.finish,
+                    message = lang.script('DIAG_COUNT_DOWN_LOOP', ('%s, -%s'):format(text:sub(source.loc.value.start, source.max.finish), source.step[1]))
+                }
+            end
+        end
+    end)
+end