我将使用Famo.us示例作为起点:
var Engine = require("famous/core/Engine"); // or just var Engine = famous.core.Engine;
var Surface = require("famous/core/Surface");
var ctx = Engine.createContext();
ctx.add(new Surface({...}));
现在我有这些GHCJS FFI绑定:
foreign import javascript unsafe "$r = famous.core.Engine;"
engine :: Engine
foreign import javascript safe "$r = ($1).createContext();"
fms_Engine_createContext0 :: Engine -> IO Context
foreign import javascript safe "$r = new famous.core.Surface($1);"
fms_Surface_new :: JSRef Surface -> IO (JSRef Surface)
foreign import javascript safe "$r = $2.add($1)"
fms_Context_add :: JSRef a -> Context -> IO RenderNode
- 如您所见,在内联JavaScript代码中,我总是需要使用完全限定名称来引用famous.core.FOO
之类的内容,而不是像通常那样只引用FOO
。
这是使用这些FFI绑定的等效Haskell片段(为了清晰起见隐藏在高级包装器后面):
main = do
-- calls fms_Engine_createContext0 under the hood
ctx <- createContext engine
-- calls fms_Surface_new under the hood
sf <- surface [ SfSize $ XY 200 200
, SfContent $ content
, SfProperties $ fromList [ ("backgroundColor", "rgb(240, 238, 233)")
, ("textAlign" , "center") ] ]
-- calls fms_Context_add under the hood
sf `addToContext` ctx
这就是问题:是否有可能使GHCJS自动生成,例如每当使用依赖于FFI绑定的FFI绑定时,输出的JavaScript中会var Engine = famous.core.Engine
和var Surface = famous.core.Surface
导入?或者我是唯一的选择,要么总是在我的内联JS中使用完全限定名称,要么总是只为每个FFI绑定手动导入一个名称?