Refactored the location of the progress_callback so that the UI can
specify it and ensure it is used by the automagics process as well as
the plugins themselves.
The progress_callback function has also had an optional description parameter
added, so that it can differentiated in case two scans happen
simultaneously.
This allows NativeSymbolTables to be appended to symbol_spaces and
uses this to let automagic modules (which have no existing symbol table
to rely on) to load natives for reading format data.
This change is quite signficant, and requires that TranslationLayers
get all additional parameters that they need through their requirements.
These are now automatically enumerated and populated on object
construction based on the requirements, so should not require lots of
repetitive filling out of fields.
It does come with the downside that TranslationLayers can only be
contructed with a context (and appropiate config), but TLs in particular
always require a context (to contain the base layer) and blank configs
can be constructed relatively easily (convenience functions can be added
if necessary).
This allows configuration trees to be built up, and their configs
spliced into an existing config (as if it were being loaded from a
file).
Not all ConstructableRequirements use this method, since SymbolTables
(for example) do not have access to the context or config_path in order
to get to any parameters stored in the context's config. They therefore
are still passed their requirement values as __init__ parameters
instead.
This also adds support for manually constructed configurables to
populate the config tree in the current context.
I'm still toying around with this though, I need to figure out
what to do with optional values and think the whole thing through
to make sure it's worthwhile.
- moved segment loading out of __init__(), now happens on first use
- fixed mapping() to return the correct chunk_size
- self._base_layer is a string, not a layer
Mike Auty