Empty string parsed as <null>

[yonaskolb]

If you try to specify an empty string as a value it's parsed as <null> instead of an empty string

yaml file:

string1: "string"
string2: string
emptyString: ""

let string = getFile()
let yaml = try Yams.load(yaml: string)
let dictionary = yaml as! [String: Any]
print(dictionary["emptyString"]!) // prints "<null>" instead of ""

[norio-nomura]

This is expected behavior with using Resolver.default.
https://github.com/jpsim/Yams/blob/master/Tests/YamsTests/ResolverTests.swift#L61
Please try using Resolver.basic as following:

let yaml = try Yams.load(yaml: string, .basic)
let dictionary = yaml as! [String: Any]
print(dictionary["emptyString"]!) // "\n"

[yonaskolb]

I see. If I used the basic Resolver I'd miss out on a lot of extra things though. It seems to me that default is supposed to be yaml defaults while basic providers some helpers. Wouldn't "" being parsed as an empty string be helpful? Is there any other way to represent an empty string?

[norio-nomura]

Currently, since Resolver.init is not disclosed, customized Resolver can not be created.
Similar problems are solved by creating customized Constructor in SwiftLint.
https://github.com/realm/SwiftLint/pull/1703/files#diff-eed8e78a3af97adda7152e3a5ff4c93eR31

[jpsim]

This should now be doable via Resolver.Rule added in #66.