When is the i_config attribute set?

[wlupton]

I am writing a plugin that adds a validator:

statements.add_validation_fun('strict', ['must'], validator)

In the validator I want to check whether the parent node is configurable. From a brief look at the tree code I think I need to look at the i_config attribute, but it doesn't always exist, and I ended up doing this:

getattr(stmt.parent, 'i_config', None)

Is this correct, what governs whether i_config is set, and is there a best practice that I should follow? Thanks.

Note:

• It seems that i_config is not set within rpc / action trees (which makes sense)
• How does tree avoid getting an error when visiting a node without i_config?

[mbj4668]

Den fre 14 jan. 2022 kl 11:23 skrev William Lupton @.***

:

I am writing a plugin that adds a validator:

statements.add_validation_fun('strict', ['must'], validator)

In the validator I want to check whether the parent node is configurable. From a brief look at the tree code I think I need to look at the i_config attribute, but it doesn't always exist, and I ended up doing this:

getattr(stmt.parent, 'i_config', None)

Is this correct, what governs whether i_config is set, and is there a best practice that I should follow? Thanks.

It is set in the 'inherit_properties' phase so it should be ok check in 'strict'. As for which nodes has it, see v_inherit_properties. Using None if not set seems correct.

Note:

• It seems that i_config is not set within rpc / action trees (which makes sense)
• How does tree avoid getting an error when visiting a node without i_config?

Pure luck, perhaps ;-) It seems it checks other properties before it checks i_config.

/martin

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[wlupton]

Thanks!