YAML support

steve64

It would be helpful to add YAML built-in support to LuaRT as done for JSON.
LYAML, for instance, could be a potential starting point ([Login to see the link])

kwi

as a temporary solution - you can use lyaml as an external dependency (luart supports lua modules), if you dont want to build it by yourself - use precompiled version from any batteries-included distribution, i use [Login to see the link].

Samir

Next LuaRT version will included a YAML module 😉

steve64

It seems that current YAML support is not hierachical.
See this example:

local yaml = require "yaml"

local t = { label = 'demo', data = { name = "Bob", age = 42 } }
local ok, err = yaml.save("person.yaml", t)
if not ok then print("Save failed:", err) end

generates:

data: {age: 42, name: Bob}
label: demo

Is this what you expected?

Samir

Order is only respected for json arrays [ ], because Lua tables dont save orders for keys other than numbers.

The same behaviour can be observed with json.

steve64

I know about Lua tables, actually my question was about the hierarchy.
Lua subtables seem not converted to Yaml sublayers with current "yaml" module.

Samir

Oh you meant hierarchy with spaces.
Yamal.load() supports it but you're right save is not.

I will see what can be done to respect it

Samir

I can confirm it's a bug. I have it fixed now.
It will be available in next LuaRT release.
Thank you for this report !