chore: remove useless code

lua/Trans/core/buffer.lua

@@ -2,7 +2,7 @@ local api, fn = vim.api, vim.fn
 
 ---@class TransBuffer
 ---@field bufnr integer buffer handle
----@field [number] string|TransNode|TransNode[] buffer[line] content
+---@field [integer] string|TransNode|TransNode[] buffer[line] content
 local buffer = {}
 
 -- INFO : corountine can't invoke C function

lua/Trans/util/node.lua

@@ -4,62 +4,63 @@ local util = require 'Trans'.util
 ---@field [1] string text to be rendered
 ---@field render fun(self: TransNode, buffer: TransBuffer, line: number, col: number) render the node
 
+local item = (function()
+    ---@class TransItem : TransNode
+    local mt = {
+        ---@param self TransItem
+        ---@param buffer TransBuffer
+        ---@param line integer
+        ---@param col integer
+        render = function(self, buffer, line, col)
+            if self[2] then
+                buffer:add_highlight(line, self[2], col, col + #self[1])
+            end
+        end,
+    }
+    mt.__index = mt
 
----@class TransItem : TransNode
+    ---Basic item node
-local item_meta = {
+    ---@param tuple {[1]: string, [2]: string?}
-    ---@param self TransItem
+    ---@return TransItem
-    ---@param buffer TransBuffer
+    return function(tuple)
-    ---@param line integer
+        return setmetatable(tuple, mt)
-    ---@param col integer
+    end
-    render = function(self, buffer, line, col)
+end)()
-        if self[2] then
-            buffer:add_highlight(line, self[2], col, col + #self[1])
-        end
-    end,
-}
 
----@class TransText : TransNode
+local text = (function()
----@field step string
+    ---@class TransText : TransNode
----@field nodes TransNode[]
+    ---@field step string
-local text_meta = {
+    ---@field nodes TransNode[]
-    ---@param self TransText
-    ---@param buffer TransBuffer
-    ---@param line integer
-    ---@param col integer
-    render = function(self, buffer, line, col)
-        local nodes = self.nodes
-        local step  = self.step
-        local len   = step and #step or 0
 
-        for _, node in ipairs(nodes) do
+    local mt = {
-            node:render(buffer, line, col)
+        ---@param self TransText
-            col = col + #node[1] + len
+        ---@param buffer TransBuffer
-        end
+        ---@param line integer
-    end,
+        ---@param col integer
-}
+        render = function(self, buffer, line, col)
+            local nodes = self.nodes
+            local step  = self.step
+            local len   = step and #step or 0
 
-item_meta.__index = item_meta
+            for _, node in ipairs(nodes) do
-text_meta.__index = text_meta
+                node:render(buffer, line, col)
+                col = col + #node[1] + len
+            end
+        end,
+    }
 
+    mt.__index = mt
 
----Basic item node
+    ---@param nodes {[number]: TransNode, step: string?}
----@param tuple {[1]: string, [2]: string?}
+    ---@return TransText
----@return TransItem
+    return function(nodes)
-local function item(tuple)
+        return setmetatable({
-    return setmetatable(tuple, item_meta)
+            [1]   = table.concat(util.list_fields(nodes, 1), nodes.step),
-end
+            step  = nodes.step,
-
+            nodes = nodes,
-
+        }, mt)
-
+    end
----@param nodes {[number]: TransNode, step: string?}
+end)()
----@return TransText
-local function text(nodes)
-    return setmetatable({
-        [1]   = table.concat(util.list_fields(nodes, 1), nodes.step),
-        step  = nodes.step,
-        nodes = nodes,
-    }, text_meta)
-end
 
 
 ---@param args {[number]: TransNode, width: integer, spin: string?}
@@ -85,7 +86,6 @@ end
 ---@class TransUtil
 ---@field node TransNodes
 
-
 ---@class TransNodes
 return {
     item = item,