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[mkgmap-dev] multi-word street search

From Steve Ratcliffe steve at parabola.me.uk on Wed Dec 10 22:52:53 GMT 2014

Hi Andrzej

> what is the reason for using "dirty names" for sorting? You have this
> comment in code:

Because I believed that was the correct way to do it.

> // We sort on the dirty name (ie with the Garmin shield codes) although
> those codes do not
> // affect the sort order. The string for mdr15 does not include the
> shield codes.

This is because it shouldn't make much difference: if A sorts
before B then A will also sort before <shield>B and <shield>A will
sort before B.  Different kinds of shields do (or can) sort
among themselves <shieldA>A and <shieldB>A can sort in that
order, but would be entirely overridden by what comes next
so <shieldB>A would be before <shieldA>B.

> I have tried to swap "dirty names" with "clean names" and search seems
> to work in Mapsource. Maybe it depends on label coding?

So that is interesting, it really shouldn't make any/much difference
in practice (it may have done when I wrote the comment). So we need
to find out what difference it makes to the sort order.

> Processing of clean names would be easier.

Maybe, but it not about what is easier ;)

If you could work out what the difference is that would be great.


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