Re: [Qemu-devel] [PATCH v12 1/6] qdict: implement a qdict_crumple method for un-flattening a dict

[Kevin Wolf <kwolf@redhat.com>]

Am 15.09.2016 um 14:45 hat Daniel P. Berrange geschrieben:
> The qdict_flatten() method will take a dict whose elements are
> further nested dicts/lists and flatten them by concatenating
> keys.
> 
> The qdict_crumple() method aims to do the reverse, taking a flat
> qdict, and turning it into a set of nested dicts/lists. It will
> apply nesting based on the key name, with a '.' indicating a
> new level in the hierarchy. If the keys in the nested structure
> are all numeric, it will create a list, otherwise it will create
> a dict.
> 
> If the keys are a mixture of numeric and non-numeric, or the
> numeric keys are not in strictly ascending order, an error will
> be reported.
> 
> As an example, a flat dict containing
> 
>  {
>    'foo.0.bar': 'one',
>    'foo.0.wizz': '1',
>    'foo.1.bar': 'two',
>    'foo.1.wizz': '2'
>  }
> 
> will get turned into a dict with one element 'foo' whose
> value is a list. The list elements will each in turn be
> dicts.
> 
>  {
>    'foo': [
>      { 'bar': 'one', 'wizz': '1' },
>      { 'bar': 'two', 'wizz': '2' }
>    ],
>  }
> 
> If the key is intended to contain a literal '.', then it must
> be escaped as '..'. ie a flat dict
> 
>   {
>      'foo..bar': 'wizz',
>      'bar.foo..bar': 'eek',
>      'bar.hello': 'world'
>   }
> 
> Will end up as
> 
>   {
>      'foo.bar': 'wizz',
>      'bar': {
>         'foo.bar': 'eek',
>         'hello': 'world'
>      }
>   }
> 
> The intent of this function is that it allows a set of QemuOpts
> to be turned into a nested data structure that mirrors the nesting
> used when the same object is defined over QMP.
> 
> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

> +    /* NB this isn't a perfect check - eg it won't catch
> +     * a list containing '1', '+1', '01', '3', but that
> +     * does nto matter - we've still proved that the

s/nto/not/

> +    if (is_list) {
> +        dst = QOBJECT(qlist_new());
> +
> +        for (i = 0; i < qdict_size(multi_level); i++) {
> +            char *key = g_strdup_printf("%zu", i);
> +
> +            child = qdict_get(multi_level, key);
> +            g_free(key);
> +
> +            if (!child) {
> +                error_setg(errp,
> +                           "Missing list index %zu", i);

This fits on a single line.

> +                goto error;
> +            }
> +
> +            qobject_incref(child);
> +            qlist_append_obj(qobject_to_qlist(dst), child);
> +        }
> +        QDECREF(multi_level);
> +        multi_level = NULL;
> +    } else {
> +        dst = QOBJECT(multi_level);
> +    }

The rest looks good, so with these fixed you can add:

Reviewed-by: Kevin Wolf <kwolf@redhat.com>