Re: [Yaml-core] Parsing YAML into key:value tree nodes with C library

[Ingy d. N. <in...@in...>]

Greetings,

This mailing list isn't used for much anymore, save high level
announcements from time to time.

A couple things:

   - Check out https://github.com/pantoniou/libfyaml/ which is more full
   featured and under active development.
   - Join https://matrix.to/#/#chat:yaml.io which is the new best way to
   engage with the YAML community.
      - #yaml IRC is still around on the libera.chat IRC network.

Cheers, Ingy


On Mon, Aug 16, 2021 at 12:19 PM Felix Krause <ya...@fl...> wrote:

> Hi David,
>
> libyaml does contain such an API:
> https://github.com/yaml/libyaml/blob/master/include/yaml.h#L1457
>
> This gives you a yaml_document_t with a root node accessible via
> yaml_document_get_root_node. The API is not well-documented but basically
> nodes can refer to sub-nodes via an int index and you use
> yaml_document_get_node to retrieve subnodes.
>
> mapping and sequence nodes store their children in a stack structure – you
> iterate them via
>
> for (yaml_node_item_t *cur = node->data.sequence.start; cur != node->data.sequence.top; ++cur) {
>    // ...
> }
>
> Now if you load in a YAML that contains a mapping with scalar key/value
> pairs, your root node will be a mapping and the subnodes will be scalars.
> ------------------------------
>
> If you want a more convenient API, I did write this utility in the past:
> https://github.com/flyx/libyaml_constructor
>
> It is a code generator that reads in a C header containing type
> definitions and autogenerates code that loads YAML into those types (using
> libyaml). With this, you can define how your YAML structure must look via C
> types and some annotations in the given header.
>
> That tool was a part of a project which I abandoned, hence I never did a
> proper release. However it did work quite well for all I can remember. The
> compile-time dependency on libclang (to parse your C header) may be a bit
> of a hurdle.
>
> Cheers,
> Felix
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