HsLua.Aeson

Pushes and retrieves aeson Values to and from the Lua stack.

• JSON null values are encoded as light userdata containing the NULL pointer.
• Objects are converted to string-indexed tables.
• Arrays are converted to sequence tables and are given a metatable. This makes it possible to distinguish between empty arrays and empty objects. The metatable is stored in the registry under key 'HsLua JSON array'' (see also jsonarray).
• JSON numbers are converted to Lua numbers, i.e., Number; the exact C type may vary, depending on compile-time Lua configuration.

Documentation

peekValue :: LuaError e => Peeker e Value

Retrieves an Aeson Value from the Lua stack.

pushValue :: LuaError e => Pusher e Value

Hslua StackValue instance for the Aeson Value data type.

peekViaJSON :: (FromJSON a, LuaError e) => Peeker e a

Retrieves a value from the Lua stack via JSON.

pushViaJSON :: (ToJSON a, LuaError e) => Pusher e a

Pushes a value to the Lua stack as a JSON-like value.

jsonarray :: Name

Name of the registry slot holding the metatable given to array tables. The registry entry can be replaced with a different table if needed.

Encoding arbitrary objects

peekToAeson :: Peeker e (ToAeson e)

Gets the ToAeson function from a Lua userdata object.

pushToAeson :: Pusher e (ToAeson e)

Pushes a function that converts the object at a given index into a Value.