Dump as JSON

[Mikael Ståldal]

It would be useful to be able to dump as JSON. SnakeYAML is almost, but not quite, able to do that with these DumperOptions:

• defaultFlowStyle = DumperOptions.FlowStyle.FLOW
• defaultScalarStyle = DumperOptions.ScalarStyle.DOUBLE_QUOTED
• width = Int.MAX_VALUE

You can valid JSON with some post processing (Kotlin code, but you get the idea):

                .replace("""!!null "null"""", "null")
                .replace("""!!bool "true"""", "true")
                .replace("""!!bool "false"""", "false")
                .replace("""!!int "([+-]?[0-9]+)"""".toRegex(), "$1")

Maybe add DumperOptions.ScalarStyle.JSON ?

[Andrey Somov]

a test is worth of thousand words. Can you please create a (failing) test ?

[Andrey Somov]

Please be aware that

“true”

and

true

are not the same

but

“!! bool 'true'”

and

true

are the same

[Mikael Ståldal]

Test added: https://bitbucket.org/snakeyaml/snakeyaml/pull-requests/70

[Andrey Somov]

I got you now. I was thinking about kind of “flexible“ scalar style. I will check it next week.
If you have any solution - you are welcome ! I am not sure DumperOptions.ScalarStyle.JSON would work…

[Andrey Somov]

For you information. there is a proposal to make FlowStyle also flexible.

[Andrey Somov]

I will most probably try to implement the JSON style for SnakeYAML Engine (where we explicitly support JSON)

SnakeYAML is not fully JSON compatible.

[Andrey Somov]

Can you please help to identify which scalar style should be used for all the types in the spec ?

https://yaml.org/type/index.html

‌

Double quoted - for !!str

Plain - for !!bool, !!float, !!int, !!null

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What about all the others ?

[Mikael Ståldal]

Good question. They cannot be SINGLE_QUOTED, LITERAL or FOLDED, that's not correct JSON.

We can use DOUBLE_QUOTED for !!binary and !!timestamp.

I don't think that !!yaml, !!merge or !!value can be supported at all when dumping to JSON, maybe just throw an exception if trying to.

‌

[Andrey Somov]

I agree (started to work on it…)