What to do about empty sequences and mappings?

[gvx]

I've been writing a Dumper that outputs data conforming to strictyaml, and in my testing of it's behaviour, I've found a problem: the only way to represent empty sequences and mappings in YAML is with flow style, which strictyaml disallows. I don't really know any way around making an exception for [] and {}, though, aside from just refusing to dump empty lists and dicts.

[crdoconnor]

Good question. How about this::

load("x:", Map({"x": Seq(Str())}) | EmptySeq())) == {"x": []}

load("x:", Map({"x": MapPattern(Str(), Str())}) | EmptyMap())) == {"x": {}}

[gvx]

I assume you mean

load("x:", Map({"x": Seq(Str()) | EmptySeq()})) == {"x": []}
load("x:", Map({"x": MapPattern(Str(), Str()) | EmptyMap()})) == {"x": {}}

? If so, I'm perfectly fine with emitting nothing for empty lists and dicts.

[crdoconnor]

oops, yeah that. I was anyway thinking of creating a null type and this is almost the same thing.

Let me ponder this for a day or so though before I implement though. I need to think through the implications.

[crdoconnor]

Still not sure if this is the best approach, but anyway: 58bba77 is released on version 0.3.8.