fix: Lua 5.1 兼容性 + CI 稳定性

- 修复 rime_context_filter.lua: load() 在 Lua 5.1 上用 loadstring
- 修复 test: load(ser) 在 Lua 5.1 上改用 loadstring
- 修复 CI: luarocks install 添加 continue-on-error

.github/workflows/ci.yml

@@ -12,11 +12,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Install Lua & luacheck
+      - name: Install Lua & luarocks
         run: |
           sudo apt-get update -qq
           sudo apt-get install -y -qq lua5.3 luarocks 2>/dev/null
-          sudo luarocks install luacheck 2>/dev/null
+      - name: Install luacheck
+        continue-on-error: true
+        run: sudo luarocks install luacheck 2>&1
       - name: Lint
         run: luacheck rime_context_filter.lua --std luacheck --no-max-line-length || true
 

rime_context_filter.lua

@@ -97,18 +97,29 @@ local function load(data_file)
   if not content or #content == 0 then return {}, 0 end
 
   local safe_env = {}
-  -- Lua 5.3+: load(chunk, name, mode, env)
-  -- Lua 5.1/LuaJIT: load(chunk, name) only — no sandbox parameter
-  local loader, err = load(content, "@" .. data_file, "t", safe_env)
-  if not loader then
-    -- Lua 5.1/LuaJIT 降级（无沙箱参数）
-    loader, err = load(content, "@" .. data_file)
+  local loader, err
+
+  if _VERSION == "Lua 5.1" then
+    -- Lua 5.1: load() accepts function only; loadstring for string chunks
+    loader, err = loadstring(content, "@" .. data_file)
     if loader then
       io.stderr:write("[rime-context-filter] WARNING: " ..
-        "Sandbox unavailable on Lua 5.1/LuaJIT. " ..
+        "Sandbox unavailable on Lua 5.1. " ..
         "Data file could access global environment.\n")
     end
+  else
+    -- Lua 5.3+: load(chunk, name, mode, env) with sandbox
+    loader, err = load(content, "@" .. data_file, "t", safe_env)
+    if not loader then
+      -- Fallback for embedders without 4-arg load
+      loader, err = load(content, "@" .. data_file)
+      if loader then
+        io.stderr:write("[rime-context-filter] WARNING: " ..
+          "Sandbox unavailable, data file could access global environment.\n")
+      end
+    end
   end
+
   if not loader then return {}, 0 end
   local ok, data = pcall(loader)
   if not ok or type(data) ~= "table" then return {}, 0 end

test_rime_context_filter.lua

@@ -93,7 +93,12 @@ check(ser:match("^return%s*{"), "starts with return {")
 check(ser:match("}\n$"), "ends with }\\n")
 
 -- 通过 Lua VM 验证语法正确性
-local fn, err = load(ser)
+local fn, err
+if _VERSION == "Lua 5.1" then
+  fn, err = loadstring(ser)
+else
+  fn, err = load(ser)
+end
 check(fn ~= nil, "serialized output is valid Lua (" .. tostring(err) .. ")")
 if fn then
   local ok2, loaded = pcall(fn)
@@ -109,7 +114,12 @@ end
 local empty_ser = serialize({})
 check(empty_ser:match("^return {"), "empty starts with return {")
 check(empty_ser:match("}\n$"), "empty ends with }\\n")
-local fn2, err2 = load(empty_ser)
+local fn2, err2
+if _VERSION == "Lua 5.1" then
+  fn2, err2 = loadstring(empty_ser)
+else
+  fn2, err2 = load(empty_ser)
+end
 check(fn2 ~= nil, "empty output is valid Lua (" .. tostring(err2) .. ")")
 if fn2 then
   local ok3, empty_data = pcall(fn2)