Commit 41da192ee9e528b15f9758c861dc041923c67114 - telml

start to do better error-handling Getty Ritter 2 years ago

1 changed file(s) with 29 addition(s) and 12 deletion(s). Collapse all Expand all

+29

-12

telml-bin/src/Main.hs less more

145	145	[ "Lua definition of `telml.",
146	146	Text.unpack (nafName naf),
147	147	"` not a function, found ",
148		go (nafActual naf),
	148	ppType (nafActual naf),
149	149	" instead"
150	150	]
151	151	where
152		go Lua.TypeNil = "nil"
153		go Lua.TypeBoolean = "boolean"
154		go Lua.TypeLightUserdata = "userdata (light)"
155		go Lua.TypeNumber = "number"
156		go Lua.TypeString = "string"
157		go Lua.TypeTable = "table"
158		go Lua.TypeFunction = "function"
159		go Lua.TypeUserdata = "userdata"
160		go Lua.TypeThread = "thread"
161		go Lua.TypeNone = "something unspeakable"
	152
	153	data NotAString = NotAString
	154	{nasName :: Text.Text, nasActual :: Lua.Type}
	155	deriving (Show)
	156
	157	instance Exn.Exception NotAString where
	158	displayException nas =
	159	concat
	160	[ "Result of calling `telml.",
	161	Text.unpack (nasName nas),
	162	"` not a string, found ",
	163	ppType (nasActual nas),
	164	" instead"
	165	]
	166	where
	167
	168	ppType :: Lua.Type -> String
	169	ppType Lua.TypeNil = "nil"
	170	ppType Lua.TypeBoolean = "boolean"
	171	ppType Lua.TypeLightUserdata = "userdata (light)"
	172	ppType Lua.TypeNumber = "number"
	173	ppType Lua.TypeString = "string"
	174	ppType Lua.TypeTable = "table"
	175	ppType Lua.TypeFunction = "function"
	176	ppType Lua.TypeUserdata = "userdata"
	177	ppType Lua.TypeThread = "thread"
	178	ppType Lua.TypeNone = "something unspeakable"
162	179
163	180	standardTags :: Text.Text -> [Text.Text] -> LuaM Text.Text
164	181	standardTags n ps =

195	212	case result of
196	213	Nothing -> do
197	214	actualtyp <- Lua.ltype 2
198		~~error ("expected string, got" ++ show~~ actualtyp)
	215	throw (NotAString n actualtyp)
199	216	Just r -> do
200	217	return (Text.decodeUtf8 r)
201	218	_ -> throw (NotAFunction n typ)