Re: [Qemu-devel] [PATCH 2/5] scripts: qmp-shell: add support for [] expressions

[Eric Blake]

On 04/21/2015 08:02 PM, John Snow wrote:
> qmp-shell currently allows you to describe values as
> JSON expressions:
> 
> key={"key":{"key2":"val"}}
> 
> But it does not currently support arrays, which are needed
> for serializing and deserializing transactions:
> 
> key=[{"type":"drive-backup","data":{...}}]
> 
> Add support for arrays.
> 
> CAVEAT: The parser is still extremely rudimentary and does not
> expect to find spaces in {} nor [] expressions. This patch does
> not improve this functionality.
> 
> Signed-off-by: John Snow <address@hidden>
> ---
>  scripts/qmp/qmp-shell | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/scripts/qmp/qmp-shell b/scripts/qmp/qmp-shell
> index a9632ec..5347f89 100755
> --- a/scripts/qmp/qmp-shell
> +++ b/scripts/qmp/qmp-shell
> @@ -102,6 +102,8 @@ class QMPShell(qmp.QEMUMonitorProtocol):
>                      value = False
>                  elif opt[1].startswith('{'):
>                      value = json.loads(opt[1])
> +                elif opt[1].startswith('['):
> +                    value = json.loads(opt[1])

Why not:

elif opt[1].startswith('{'} or opt[1].startswith('['):

for a one-line change instead of two-line addition?  And I'm no python
expert, but I think you can write that with fewer characters. Untested,
but does this work?

elif opt[1][0] in "{[":

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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